ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • American Institute of Physics (AIP)  (241,950)
  • Institute of Electrical and Electronics Engineers (IEEE)  (67,622)
  • 1
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-06
    Description: A deployable structure serves an important function in small satellites as their performance is improved steadily. Larger deployable solar array paddles are expected as the satellite requires a larger amount of electric power. The synthetic aperture radar (SAR) system for small satellites requires a deployable antenna. Various deployable membrane structures have been proposed for the deorbit of micro/nanosatellites in low Earth orbit. The actuators and devices for a deployable structure continue to progress along with the development of a deployable structure. The hold-release mechanism has been becoming smaller and simpler. The shape control devices are actively researched for a high-precision deployable structure. There are several requirements imposed on the deployable structures, e.g., low cost, lightweight, small volume in stored configuration, reliable deployment, large aperture in deployed configuration, and accuracy/repeatability of a deployed shape. Dedicated efforts are made to satisfy these requirements in research and development of a deployable structure/device. This paper provides an overview of the past and current research and development of a deployable structure for small satellites.
    Print ISSN: 0018-9219
    Electronic ISSN: 1558-2256
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-06
    Description: The low-cost and short-lead time of small satellites has led to their use in science-based missions, earth observation, and interplanetary missions. Today, they are also key instruments in orchestrating technological demonstrations for On-Orbit Operations (O 3 ) such as inspection and spacecraft servicing with planned roles in active debris removal and on-orbit assembly. This paper provides an overview of the robotics and autonomous systems (RASs) technologies that enable robotic O 3 on smallsat platforms. Major RAS topics such as sensing & perception, guidance, navigation & control (GN&C) microgravity mobility and mobile manipulation, and autonomy are discussed from the perspective of relevant past and planned missions.
    Print ISSN: 0018-9219
    Electronic ISSN: 1558-2256
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-06
    Description: Advertisement, IEEE.
    Print ISSN: 0018-9219
    Electronic ISSN: 1558-2256
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-06
    Description: Monitoring and understanding geophysical processes in the thermosphere is primordial for space physics, low Earth orbiters, and ground-based technologies. In the last half century, thermospheric variations, anomalies, and climatology have been investigated and reported, but were limited due to lack of observations and large uncertainty in the models. Today, Global Navigation Satellite Systems (GNSS) and accelerometers on small satellites can sense neutraldensity and wind variations with unprecedented accuracy, which contribute to understand thermospheric variations and improve the current empirical and physical models. In this paper, an overview of past and present developments and efforts in sensing and modeling thermospheric density and wind variations is presented, as well as the future challenges and perspectives for GNSS and accelerometers on small satellites.
    Print ISSN: 0018-9219
    Electronic ISSN: 1558-2256
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: The performance of spiral micro-structured fiber Bragg grating (FBG) and standard FBG hydrogen sensor with different morphologies of Pt-WO 3 has been presented. Femtosecond laser was employed to fabricate spiral micro-sturctured on fiber cladding of FBG. WO 3 nanorods, nanowires, and nanolamellae were synthesized by hydrothermal process and decorated with Pt nanoparticles by decomposing Pt(acca) 2 precursor (molar ratio of Pt:W = 1:5). FBG hydrogen sensors with Pt-WO 3 nanolamellae have the highest sensitivity (spiral micro-structured FBG sensor ~208 pm/%H, standard FBG sensor ~110 pm/%H), followed by nanorod and nanowire sensors. Moreover, the sensitivity of the spiral micro-structured FBG sensors are about 1.8 ~ 2.5 times than that of standard FBG sensors. The results show that the sensors with WO 3 nanowires have the fastest response time.
    Print ISSN: 1530-437X
    Electronic ISSN: 1558-1748
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: The traditional optical rotary sensors measured the absolute angular position of a rotating object by sensing the current position of a coded disk using the optical trans-receiver. Due to the small air gap in between the optical trans-receiver and the disk, the sensor cannot withstand the effect of vibration. Also, its fabrication cost is correlated with the disk coding pattern. Thus, in order to overcome such issues a simple, coding free optical rotary sensor is presented in this paper. Instead of binary patterns, here an opaque shaft coupled disk having a single window is used as a positional pointer over a light sensitive circular track. The track has four equal spaces of hollow channels and each one consists of a single photo detector (PD). The PD is placed at the end of the channel wall. Thus, in the presence of a light source, the position of the disk window is determined by measuring the diffused light intensity variation of each channel surface. In order to prove this concept, an experimental prototype has been designed, developed, and tested, where satisfactory performance is achieved in the measured range of 0–360°.
    Print ISSN: 1530-437X
    Electronic ISSN: 1558-1748
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: This paper is mainly focused on piezoresistive accelerometer performance improvement. Thus a new model of this sensor is derived to enhance its various parameters, such as precision, sensitivity, and reliability. Moreover, applying this model, a new design of piezoresistive accelerometer can be achieved. The developed model is validated by simulations and confirmed by experimental tests to verify its effectiveness in industrial applications. The comparison study showed that the best choice of damping rate to reduce the measurement error and increase the precision corresponds to the rate chosen in this paper. The results have also demonstrated that a more reliable sensor can be designed compared with the existing designs.
    Print ISSN: 1530-437X
    Electronic ISSN: 1558-1748
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Force-distance curve-based atomic force microscopy (FD-based AFM) has been extensively used to study the interactive phenomena and mechanical properties of various materials at the nanoscale. Unlike the commonly used piezodrive FD-based AFM that uses two sensors (cantilever and piezoactuator), the magnetic-drive FD-based AFM uses only one sensor of an off-resonant oscillating cantilever to measure the FD curve. However, due to inconsistent probe sensitivities induced by the force and magnetic torque, locations of the laser spot and magnetic bead need to be specified for broad modulus range nanomechanical mapping. Here, a calibration method is presented to obtain a uniform probe sensitivity induced by the force and magnetic torque. In this method, the torque-induced deflection sensitivity is accurately determined by the deflection tracking approach. Impacts of the laser spot and magnetic bead location on deflection sensitivity are investigated, and a straight protocol is developed to locate the laser spot for unifying two deflection sensitivities. The proposed calibration methods are applied in mapping nanomechanical properties of polystyrene, highly oriented pyrolytic graphite surfaces at driving frequencies of 5 kHz in air, and polydimethylsiloxane surface at 0.5 kHz in liquid environment.
    Print ISSN: 1530-437X
    Electronic ISSN: 1558-1748
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Some applications in scientific imaging, like space-based high-precision photometry, benefit from a detailed characterization of the sensitivity variation within a pixel. A detailed map of the intra-pixel sensitivity (IPS) allows to increase the photometric accuracy by correcting for the impact of the tiny sub-pixel movements of the image sensor during integration. This paper reports the measurement of the sub-pixel sensitivity variation and the extraction of the IPS map of a front-side illuminated CMOS image sensor with a pixel pitch of $6~mu text{m}$ . Our optical measurement setup focuses a collimated beam onto the imaging surface with a microscope objective. The spot was scanned in a raster over a single pixel to probe the pixel response at each (sub-pixel) scan position. We model the optical setup in ZEMAX to cross-validate the optical spot profile described by an Airy diffraction pattern. In this paper, we introduce a forward modeling technique to derive the variation of the IPS. We model the optical spot scanning system and discretize the CMOS pixel response. Fitting this model to the measured data allows us to quantify the spatial sensitivity variation within a single pixel. Finally, we compare our results to those obtained from the more commonly used Wiener deconvolution.
    Print ISSN: 1530-437X
    Electronic ISSN: 1558-1748
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: The production of low cost sensors to monitor environment in some industrial sectors is a current need. In aviculture centers, for example, the concentration of ammonia gas is related to humidity, and it is necessary to control it to avoid contamination. With this need in mind, this paper presents the preparation and characterization of a low cost humidity sensor based on poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) and polyaniline fully printed onto paper by a commercial HP printer. Using electrochemical impedance spectroscopy, an equivalent circuit containing resistive and capacitive parameters was proposed. The resistive parameter R1 is related to values of ambient humidity. The R1 values showed a sensitive response of 200% when relative humidity changes 80%, taking 10 min to reach saturation point. Moreover, the device showed good stability when humidity remained constant. These results indicate that the proposed device is suitable for applying as a humidity sensor that costs less than 1 Euro cent.
    Print ISSN: 1530-437X
    Electronic ISSN: 1558-1748
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 11
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Resonant cavity is an important component of Overhauser magnetometer sensor. Its function is to make the working substance generate dynamic nuclear polarization effect in the sensor. An alternative design of resonant cavity based on the birdcage coil structure is proposed to make the resonant frequency in accordance with the polarization frequency of the working substance. The structure and equivalent circuit of resonant cavity are analyzed. The model of resonant cavity is established, and S-parameter is calculated. The simulating results show that resonant frequency of the resonant cavity is about 60 MHz, which is consistent with the polarization frequency of the working substance in the sensor, and Q-factor of the resonant cavity is about 90. A dual-coil structure for pick-up coil and series resonant circuit are designed for reducing interference. In addition, output signal experiment and simultaneous comparison testing of sensor prototype are conducted. Overall, this design has the advantages of high performance and strong anti-interference. The resolution, uncertainty, and range of the sensor reach to 0.005 nT, 0.2 nT, and 20 000–100 000 nT, respectively.
    Print ISSN: 1530-437X
    Electronic ISSN: 1558-1748
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 12
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Face images captured by surveillance cameras are often of low resolution (LR), which adversely affects the performance of their matching with high-resolution (HR) gallery images. Existing methods including super resolution, coupled mappings (CMs), multidimensional scaling, and convolutional neural network yield only modest performance. In this letter, we propose the deep coupled ResNet (DCR) model. It consists of one trunk network and two branch networks. The trunk network, trained by face images of three significantly different resolutions, is used to extract discriminative features robust to the resolution change. Two branch networks, trained by HR images and images of the targeted LR, work as resolution-specific CMs to transform HR and corresponding LR features to a space where their difference is minimized. Model parameters of branch networks are optimized using our proposed CM loss function, which considers not only the discriminability of HR and LR features, but also the similarity between them. In order to deal with various possible resolutions of probe images, we train multiple pairs of small branch networks while using the same trunk network. Thorough evaluation on LFW and SCface databases shows that the proposed DCR model achieves consistently and considerably better performance than the state of the arts.
    Print ISSN: 1070-9908
    Electronic ISSN: 1558-2361
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 13
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Presents the table of contents for this issue of the publication.
    Print ISSN: 1053-5888
    Electronic ISSN: 1558-0792
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 14
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Specialization, and the resulting tool diversity, is a fundamental aspect of the modern DevOps toolchain. How does this affect the value stream architecture?
    Print ISSN: 0740-7459
    Electronic ISSN: 1937-4194
    Topics: Computer Science
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 15
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: This paper addresses the issue of deceptive jamming against synthetic aperture radar (SAR) by using 1-bit sampling and time-varying threshold (TVT). With 1-bit intercepted SAR signal, the multipliers involved in a convolution is replaced by xnor gates, which considerably simplify the jamming signal generation. Moreover, the TVT is used for 1-bit quantization before retransmission to retain the relative amplitude information of the jamming signal. As a result, the proposed deceptive jamming schemes are superior to their conventional counterpart in terms of realization. Effects of harmonics and oversampling are analyzed to evaluate the performance degradations caused by the 1-bit sampling and TVT. Simulation results are provided to confirm the validity of the proposed schemes.
    Print ISSN: 1939-1404
    Topics: Geosciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 16
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: A novel method that combines joint clusters and iterative graph cuts for ALS point cloud filtering is proposed in this paper. The method first extracts clusters of points from the raw point cloud, and then classifies ground points at the cluster level. There are four main steps, i.e., two-step point cloud clustering, critical point extraction, initial terrain determination, and terrain densification based on iterative graph cuts. Smooth clusters, rough clusters, and scattered points are extracted by the two-step clustering to depict the raw point cloud, which reduces the complexity of raw data and the judgment difficulty in the subsequent procedures. Critical points of each cluster are extracted, and the initial terrain is determined among the smooth clusters. Using the initial terrain and critical points, iterative graph cuts is performed to segment ground and nonground points at the cluster level. Experiments on ISPRS dataset with a low point density and Utah dataset with a moderate point density show that our approach provides a satisfactory trade off between Type I and Type II errors. Moreover, our method significantly outperforms progressive TIN densification based filters, and successfully controls Type II errors.
    Print ISSN: 1939-1404
    Topics: Geosciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 17
    Publication Date: 2018-03-13
    Description: Satellite imagery often exhibits large spatial extent areas that encompass object classes with considerable variability. This often limits large-scale model generalization with machine learning algorithms. Notably, acquisition conditions, including dates, sensor position, lighting condition, and sensor types, often translate into class distribution shifts introducing complex nonlinear factors and hamper the potential impact of machine learning classifiers. This paper investigates the challenge of exploiting satellite images using convolutional neural networks (CNN) for settlement classification where the class distribution shifts are significant. We present a large-scale human settlement mapping workflow based-off multiple modules to adapt a pretrained CNN to address the negative impact of distribution shift on classification performance. To extend a locally trained classifier onto large spatial extents areas we introduce several submodules: First, a human-in-the-loop element for relabeling of misclassified target domain samples to generate representative examples for model adaptation; second, an efficient hashing module to minimize redundancy and noisy samples from the mass-selected examples; and third, a novel relevance ranking module to minimize the dominance of source example on the target domain. The workflow presents a novel and practical approach to achieve large-scale domain adaptation with binary classifiers that are based-off CNN features. Experimental evaluations are conducted on areas of interest that encompass various image characteristics, including multisensors, multitemporal, and multiangular conditions. Domain adaptation is assessed on source–target pairs through the transfer loss and transfer ratio metrics to illustrate the utility of the workflow.
    Print ISSN: 1939-1404
    Topics: Geosciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 18
    Publication Date: 2018-03-13
    Description: The linear operator has been widely used to detect targets of interest in multispectral/hyperspectral images, and is usually able to achieve good performance when the target is linearly separable from the background. However, when dealing with a complex scene, it is hard to find a single projection direction, along which the target can be well distinguished from all the background objects. Therefore, we propose a piecewise linear strategy (PLS) for target detection, which is based on the assumption that the desired target is generally linearly separable from each background object. PLS first divides the whole background into several partitions, and then detects the individual target for each partition by using a commonly used linear detector. Experiments with simulated and real-world multispectral/hyperspectral images show that PLS can acquire a nonlinear detection result and can outperform state-of-the-art target detection operators.
    Print ISSN: 1939-1404
    Topics: Geosciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 19
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Provides instructions and guidelines to prospective authors who wish to submit manuscripts.
    Print ISSN: 1939-1404
    Topics: Geosciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 20
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Advertisements.
    Print ISSN: 1939-1404
    Topics: Geosciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 21
    Publication Date: 2018-03-13
    Description: We propose a high-resolution velocity analysis method to estimate the electromagnetic wave propagation velocity in subsurface medium. The estimation is achieved by applying the ℓ-1 norm regularized least-squares method to the conventional common-midpoint (CMP) velocity analysis algorithm. The proposed method can provide not only higher resolution than the conventional velocity analysis method, but can also be applied with a coarse sampling array system, such as our array ground penetrating radar YAKUMO, which returns eight CMP traces within a two meter width. The main purpose of this approach is for precise pavement inspection at shallow depths. We applied this method to both a simulated dataset and real data acquired by YAKUMO at a model airport taxiway to detect the slight velocity changes caused by millimeter-thin cracks filled with air or water within the 15 cm-thick asphalt pavement. In both cases slight velocity changes of about 0.005 m/ns can be detected, and the difference between air- and water-filled cracks can be distinguished. Also, this method is applied to a data acquired at airport taxi-way, the damaged parts are detected successfully and shows good agreement with the corning results. The results indicate that the proposed method is effective for pavement inspection, especially in the presence of thin cracks that cannot be seen directly with the reflected signal.
    Print ISSN: 1939-1404
    Topics: Geosciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 22
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: In this paper, an optical correlator which adopts planar integrated 2F structure and optimal tradeoff synthetic discriminant function filter is proposed to improve the system integration and the recognition ability. The specialized digital microlens is designed for the correlator to replace the physical lens. By the theoretical analysis, the structural design conditions and parameters of the correlator are given, and the system volume is 63.1 cm 3 which is only half of the planar integrated 4F optical correlator. Moreover, simulations and experimental research works reveal that the correlator can achieve stable recognition to the input object of distortion with scaling (52%, 150%), rotation (–50°, +42°), and existed scaling (72%, 130%) and rotation (–36°, +38°) simultaneously. Theoretical analysis and experimental results indicate that the planar integrated optical correlator with compact structure and high integration has good performance of distortion invariant recognition.
    Electronic ISSN: 1943-0655
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 23
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Prospective authors are requested to submit new, unpublished manuscripts for inclusion in the upcoming event described in this call for papers.
    Print ISSN: 1939-1404
    Topics: Geosciences
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 24
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Polarization topological charge (PTC) of a vector beam can be defined as the repetition number of polarization state change along the azimuthal axis, with its sign standing for the rotating direction of the polarization. In this paper, we present a design for PTC sorting of vector beams with polarization conjugated-phase component (PCC). The components, made of birefringent crystals, can induce conjugated spatial phase modulations for the orthogonal polarizations. Our simulations show, using a pair of PCC with specific design in a 4-f optical system, the system focuses vector beam modes on the locations representing the PTC of corresponding mode, and sorts PTC with separation efficiency as high as 77%. Our designs have the potential applications in modal characterization, communication, encryption, and so on.
    Electronic ISSN: 1943-0655
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 25
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: We demonstrate amorphous Ge 0.92 Sn 0.08 surface illuminated metal–semiconductor–metal (MSM) photodetectors on flexible substrates for visible wavelength. Photodetection at 633 nm is achieved with an I–V response up to 10 –4 A for a 2 V bias voltage. Different evaporation rate effects on the amorphous GeSn MSM photodetector are examined. Bending/strain effects on device performance were studied by evaluating the current density versus voltage characteristics. Amorphous GeSn thin film deposition on polyethylene terephthalate flexible substrate and Ni/Au–GeSn–Ni/Au MSM photodetector finger pattern deposition were performed via thermal evaporation. Photocurrent and dark current densities of amorphous GeSn MSM photodetectors were obtained at 1.36 A/cm 2 and 0.24 A/cm 2 , respectively, where the photocurrent to dark current contrast ratio was found to be equal to 5.6. We also examined the evaporation rate, strain, and bending effect.
    Electronic ISSN: 1943-0655
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 26
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: We report the successful fabrication of low-loss submicrometric silicon-on-insulator strip waveguides for on-chip links. Postlithography treatment and postetching hydrogen annealing have been used to smoothen the waveguide sidewalls, as roughness is the major source of transmission losses. An extremely low silicon line-edge roughness of 0.75 nm is obtained with the optimized process flow. As a result, record-low optical losses of less than 0.5 dB/cm are measured at 1310 nm for strip waveguide dimensions exceeding 500 nm. They range from 1.2 to 0.8 dB/cm for 300–400-nm-wide waveguides. Those results are to our knowledge the best ever published for a 1310-nm wavelength. These results are compared to modeling based on Payne and Lacey equations.
    Print ISSN: 1041-1135
    Electronic ISSN: 1941-0174
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 27
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: A polymer/silica hybrid waveguide Bragg grating fabricated through an ultraviolet-photobleaching method is proposed. Periodic surface corrugation on the lower silica cladding layer is induced by contact lithography and inductively coupled plasma etching. A Bragg grating with a large area and period $Lambda = 3 ,,mu text{m}$ was formed. The grating structure is transferred onto a polymer film by spin coating a negative UV photoresist (SU-8 2005) on the lower silica cladding layer. A channel waveguide is formed using the UV-photobleaching method. This configuration along the channel waveguide gives rise to strong resonance in a 7.5-mm Bragg grating. We achieve a transmission peak with an extinction ratio of 7.3 dB and a 3-dB bandwidth of 0.5 nm. The shift of the reflection peak with temperature over the range 25 °C–35 °C is 1.5 nm. This temperature dependence exhibits an average slope of −0.15 nm/°C.
    Print ISSN: 1041-1135
    Electronic ISSN: 1941-0174
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 28
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Four-level pulse amplitude modulation (PAM4) has been considered as a low-cost modulation format for capacity upgrade in digital mobile fronthaul; however, the bit error ratio increases due to the reduced Euclidean distance. In this letter, a novel scheme is proposed to suppress bit-error-induced error vector magnitude (EVM) distortion upon radio signal in PAM4-based fronthaul. The scheme is realized by pairing one high-order bit and one low-order bit onto one PAM4 symbol and setting a portion of low-order bits to “0.” As a result, sample bits with high priority are delivered by PAM2 symbols with small error probability, and sample bits with low priority are transmitted by PAM4 signal with high spectral efficiency. Without any modification of the hardware, the proportion between PAM2 and PAM4 can be flexibly adjusted according to the quality of optical link. Experiments validate that, under respective optimal PAM2/4 proportion, EVM of long term evolution-advanced like radio signal decreases by at least 20 dB, and up to 1024-quadratic-amplitude modulation can be supported.
    Print ISSN: 1041-1135
    Electronic ISSN: 1941-0174
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 29
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: We report on the design, fabrication, and characterization of a $text{1550 nm}$ / $text{1950 nm}$ directional coupler based on single-crystal diamond waveguides. The input and output ports of the waveguides are connected with $text{1550 nm}$ and $text{1950 nm}$ grating couplers to allow out-of-plane light coupling. The devices are fabricated using electron-beam lithography and reactive ion etching technologies. We obtain a good performance for both the grating couplers (efficiency of $-text{10.9 dB}$ at $text{1550 nm}$ and $-text{11.6 dB}$ at $text{1950 nm}$ ) and waveguides (attenuation of $text{2.3 dB/mm}$ at $text{1550 nm}$ and $text{4.5 dB/mm}$ at $text{1950 nm}$ ). Furthermore, the actual directional coupler component is found to be quasi-lossless. By means of directional coupler calibration devices, we measure high extinction ratios between the “cross” and “through” ports ( $text{22 dB}$ at $text{1565 nm}$ and $text{21 dB}$ at $text{1949 nm}$ ), hence showing a high-efficiency wave-combining functionality. Taking into account that integrated directional couplers are essential for allowing light routing between different on-chip devices, our results pave the way for larger-scale and more complex photonic integrated circuits in single-crystal diamond thin films.
    Print ISSN: 1077-260X
    Electronic ISSN: 1558-4542
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 30
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Sensitivity enhancement of surface plasmon resonance (SPR) sensor is proposed utilizing two-dimensional blue phosphorene/molybdenum disulfide (i.e., BlueP/MoS 2 ) heterostructure as an interacting layer with analyte. The analysis indicates that the proposed sensor design provides significantly higher sensitivity in comparison to conventional and graphene-based SPR sensors. The combined effect of number of heterostructure layers and light wavelength on sensitivity is also analyzed. The results will open a new way to BlueP/MoS 2 heterostructure based SPR sensor for bio- and gas-sensing applications in visible and near infrared spectral regions.
    Print ISSN: 1041-1135
    Electronic ISSN: 1941-0174
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 31
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: We presented a fiber optical parametric oscillator generating tunable femtosecond pulses based on four-wave mixing. By using a photonic crystal fiber as the parametric gain and a single mode fiber to select the oscillating wavelength via dispersion filtering, output pulses with a pulse duration of 350 fs, and spectral bandwidth of 5.8 nm were obtained. The wavelength of the output pulses could be tuned from 965 to 1025 nm by adjusting the dispersion filtering. This setup provides a simple and flexible light source for biomedical applications and tunable infrared pulse generation through nonlinear frequency conversion.
    Print ISSN: 1041-1135
    Electronic ISSN: 1941-0174
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 32
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: An optical link based on directly modulated vertical-cavity surface-emitting laser (VCSEL) at 850-nm wavelength using commercial VCSEL and photodiode operating error-free BER < 10 −12 ) at 40 Gbit/s is reported. The transmitter is implemented in a 14-nm FinFET CMOS while the receiver (RX) in 28-nm digital bulk-CMOS technologies. This is the fastest 850-nm VCSEL-based single-lane non-return-to-zero optical link with all the analog front-end components fabricated in CMOS. An energy-per-bit of 3.4 pJ/bit is measured at 40 Gbit/s. At lower data rates, the bandwidths of the circuits can be decreased adaptively to save power. This results in 2.7 pJ/bit at 20 Gbit/s. A sensitivity of −1.9 dBm optical modulation amplitude could be measured at the RX for 40 Gbit/s.
    Print ISSN: 1041-1135
    Electronic ISSN: 1941-0174
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 33
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: We propose a simple thermo-optic mode-selective switch based on an asymmetric directional coupler formed with a two-mode waveguide and a single-mode waveguide, where two electrodes heaters are deposited, respectively, on the two waveguides. Depending on which heater is turned on, either one of the two modes in the two-mode waveguide can be selectively switched to the single-mode waveguide or vice versa. Our typical experimental device fabricated with polymer material, which has a total length of 16.5 mm, shows extinction ratios higher than ~10 dB in the C-band for both modes. The switching powers for the two modes are 52 and 109 mW, respectively, and the corresponding switching times are 300 and 400 $mu text{s}$ . This device could be used in reconfigurable mode-division-multiplexing systems.
    Print ISSN: 1041-1135
    Electronic ISSN: 1941-0174
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 34
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: A fabrication-tolerant and highly efficient polarization splitter and rotator (PSR) based on the slanted silicon waveguides is proposed and optimized by using the full-vectorial finite element method and three-dimensional full-vectorial finite difference time domain method. The numerically simulated results show that the proposed PSR is with ultra-low losses and with the high PERs of 19.92 and 40 dB at the cross- and through-ports, respectively. The fabrication tolerances are also studied for the proposed PSR.
    Print ISSN: 1041-1135
    Electronic ISSN: 1941-0174
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 35
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: In this letter, we consider a multi-user multiple-input single-output visible light communication system. A power-efficient linear precoding for zero-forcing (ZF) detection is developed with channel uncertainty, i.e., noisy channel state information (CSI) and outdated CSI. With the constraint of a dynamic current range of light-emitting diodes, the proposed method is capable of minimizing total optical power and guaranteeing user performance. Simulation results demonstrate that the proposed precoding can achieve a lower power consumption than the pseudo-inverse ZF precoding with the same user performance.
    Print ISSN: 1041-1135
    Electronic ISSN: 1941-0174
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 36
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: In this paper, a two-electrode system performing biomedical signal recordings is presented. Thanks to a continuous balancing of the impedance bridge included in the front-end, the proposed system does not suffer the impedance mismatch of a two-electrode front-end that may affect the biopotential measurement. The rejection of the common mode interference has been improved by including a bootstrapped instrumentation amplifier [showing 133 dB common-mode rejection ratio]. The front-end differential input impedance is very high, being in the worst case 500 $text{M}Omega $ , whereas its common-mode input impedance is 135 $text{k}Omega $ . The proposed architecture also works for an unfavorable input signal-to-noise ratio (SNR) as low as −14 dB. As an example, the electronic interface has been designed and tested for an ECG -like signal. Preliminary tests on a discrete-element electronic prototype have shown the overall system capability of easily recording the heart signal, having evaluated an experimental output SNR of about 32 dB. In addition, the effectiveness of the feedback implementation in restoring the impedance balance has been demonstrated in practice.
    Print ISSN: 1530-437X
    Electronic ISSN: 1558-1748
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 37
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Owing to the large surface area, 2-D materials are being used for sensing gas molecules, which are important for environmental protection and human health. Using first principle calculations, adsorption of CO and NO gas molecules on Cu-substituted monolayer MoS 2 is studied in terms of energy, charge transfer, and density of states. Further, the behavior of CO and NO on Cu-substituted monolayer MoS 2 -based single electron transistor (SET) is explored. Strong interaction between Cu metal and MoS 2 sheet suggests the stability of the Cu-doped MoS 2 system at ambient conditions. It is further found that on doping Cu into MoS 2 sheet, the adsorption strength of CO and NO molecules got enhanced as compared with the pristine MoS 2 sheet and, hence, possesses better sensing capability. The sensing response of the Cu-doped MoS 2 sheet in the SET environment toward these molecules is studied from the calculated charge stability diagram that serves as a unique fingerprint of each adsorbed molecule. The charging energy is reduced when Cu impurity is added to MoS 2 for CO/NO adsorption, which makes such system more suitable in low-powered SET devices. The results show that SET based on Cu-doped MoS 2 can essentially detect hazardous molecules and is proved to have potential application in gas sensors.
    Print ISSN: 1530-437X
    Electronic ISSN: 1558-1748
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 38
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: In the software-based resolver-digital converters, angular position and speed are often demodulated from resolver signals after envelope detection. The accuracy of demodulation depends on the degree of perfectness of two envelope signals of the resolver. However, the envelope signals cannot be derived perfectly from the resolver outputs and they are often disturbed by amplitude deviations, DC offsets, and nonorthogonal phase shifts. In order to attenuate the effects of the unexpected factors on the accuracy of demodulation, an offline automatic calibration strategy is proposed for the two envelope signals of the resolver based on two-step gradient estimators. The first-step estimator is designed to obtain the estimate of only one parameter, i.e., angular frequency. At the second step, another gradient estimator is designed to estimate amplitudes, DC offsets, and phases of the two envelope signals. Since the angular frequency is estimated by an individual estimator which is independent from the other parameters, its estimation accuracy can be improved effectively. By using the estimate of the angular frequency with higher accuracy, the accuracy of the second-step estimator also can be improved. The effectiveness of the proposed method is verified by simulation and experimental results.
    Print ISSN: 1530-437X
    Electronic ISSN: 1558-1748
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 39
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Fiber-reinforced soft actuators use inextensible fibers to shape the expansion of elastomeric fluid-filled chambers. The classic example, McKibben muscles, is part of a broader class of cylindrical soft actuators known as fiber-reinforced elastomeric enclosures (FREEs). These actuators can be designed to twist while extending or contracting. Using a circuit of conductive, electrically insulated wire as the reinforcing fibers allows one to measure the motion of the actuator with the circuit inductance. These sensors, developed previously for McKibben muscles, are known as “Smart Braids.” This paper extends the concept of Smart Braids to the broader class of two-fiber-family cylindrical FREEs. A dimensionless model for the inductance of Smart Braid FREEs is presented that can be scaled to specific sensor geometries. This model depends only on the ratio of the fiber lengths in the two families and the angle of one of the fibers. The model was validated both numerically and experimentally, predicting the sensitivity of experimental sensors accurately, the largest errors being −11% and 9%. The model presented in this paper will enable high-level design decisions for Smart Braid FREES and optimization without computationally expensive direct numerical simulation.
    Print ISSN: 1530-437X
    Electronic ISSN: 1558-1748
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 40
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Business models around energy performance of lighting systems and managed services make increasing use of the energy metering sensor data. However, accurate submetering solutions remain expensive and complex to commission. With the goal of realizing a low-cost metering sensor solution that provides reasonable measurement accuracy, we consider nonintrusive load monitoring for lighting systems using virtual energy submetering. We propose analytics methods using metered lighting energy sensor data to address three problems: 1) provide initial validation of assets of a lighting control system; 2) disaggregate energy consumption across distinct control groups of a validated system enabling usage and performance monitoring; and 3) monitor and manage lighting system asset over lifecycle. The proposed methods are evaluated using an experimental testbed in a commercial building.
    Print ISSN: 1530-437X
    Electronic ISSN: 1558-1748
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 41
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: In this paper, we report a fully 3-D-printed, flexible, amperometric lactate sensor system with a 3-D-printed, integrated electrochemical circuit platform, a so-called potentiostat, realized via a novel 3-D printing method. First, a lactate sensor was designed in a three-electrode configuration with a layer of deposited enzyme on the conductive silver electrodes. The thin silver electrodes were printed on a flexible substrate. Second, a highly integrated potentiostat circuit prototype was designed and printed on a rigid epoxy board. Both sensor electrodes and printed circuit board (PCB) were fabricated using a novel direct ink writing (DIW) technology with highly viscous silver nanoparticle ink. The fully 3-D-printed potentiostat system along with the sensor demonstrated reliable lactate detection for concentrations in the range of 0–20 mM. The purely additive manufacturing strategy of DIW demonstrated the capability of 3-D printing double-sided circuits with high-density chip-on-board designs as well as the ability to significantly reduce the lead time of PCB prototyping. The 3-D-printed electrochemical sensor system is suitable for wearable devices for continuous monitoring of human metabolisms.
    Print ISSN: 1530-437X
    Electronic ISSN: 1558-1748
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 42
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Nowadays, the safety standards for industrial plants are tougher with respect to employee state monitoring and monitoring of working environmental conditions. Combining wireless sensor with wearable technology is possible to significantly improve safety delivery capability of such systems and add new functionality to them. Since wireless sensors use batteries as the sole energy source, the energy efficiency becomes critical. One of the solutions to reduce the energy consumption of the wireless sensor nodes is to use appropriate control for radio data transmission. In this paper, we have developed a wireless sensor system which can be attached to a uniform and used for working condition monitoring in places which could be prone to gas leakage. The main feature of the system is the possibility to be activated remotely by an RF control signal at a frequency of 866 MHz. It performs various functions of wearable sensor system, such as switching the system from sleep, measurement, and data transmission modes when external RF signal is available and its power is greater than an appropriate level. The experimental data demonstrate that the activation distance is about 2.75 m from an RF-generator that has a power of 30 dBm. The wearable sensor system is able to signalize about employee presence in relation to working facilities and to monitor temperature and combustible gases concentration. It consists of light-weight distributed parts attached to clothes and has low power consumption.
    Print ISSN: 1530-437X
    Electronic ISSN: 1558-1748
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 43
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Presents a listing of the editorial board, board of governors, current staff, committee members, and/or society editors for this issue of the publication.
    Print ISSN: 1530-437X
    Electronic ISSN: 1558-1748
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 44
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: Interval sets and hesitant fuzzy sets capture two types of hesitant situations and provide novel expression formats for decision makers. The authors propose a new hesitant fuzzy interval set and explore its information aggregation for multicriteria decision-making. An example is presented to elaborate on the performance of the approach.
    Print ISSN: 1521-9615
    Electronic ISSN: 1558-366X
    Topics: Computer Science , Natural Sciences in General , Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 45
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: The reliability of services offered by intelligent transportation systems is attributed to the accuracy and timely availability of road-network traffic information. However, in the present era of big data, compliance with anticipated service quality requirements mandates consistent real-time processing of big spatiotemporal traffic data. Thus, development of low-dimensional models is a crucial challenge in traffic data processing. The authors developed such representations using data graph framework and graph Fourier transform (GFT) approaches. Experimental results on California daily network traffic data showed that, even with a 15:1 compression ratio, GFT-based models offered less than 6 percent reconstruction error (RE), instigating a less than 2 percent increase in mean absolute percentage error of corresponding predictions. The authors also proposed a 3D graph framework, which reduced RE by almost 2 percent compared to its 2D counterpart.
    Print ISSN: 1521-9615
    Electronic ISSN: 1558-366X
    Topics: Computer Science , Natural Sciences in General , Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 46
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: A multiagent-based coordination consensus algorithm was designed to simultaneously meet state-of-charge consensus and DC bus voltage stability requirements. A distributed energy storage system model with four batteries was built in Matlab/Simulink, and local droop control was employed to achieve the proposed algorithm. A multiagent system and agent weak communication network were constructed in the JADE platform, and the effectiveness of the proposed algorithm was verified by Simulink and JADE interactive simulation. The effect of communication delay on the system was also analyzed.
    Print ISSN: 1521-9615
    Electronic ISSN: 1558-366X
    Topics: Computer Science , Natural Sciences in General , Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 47
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: The Oak Ridge Leadership Computing Facilitys newest supercomputer, Summit, will supply five to ten times more computing power than current leadership-class systems. From facility enhancements to hardware procurement and application development, the project serves as a blueprint for advancing whats possible in scientific discovery.
    Print ISSN: 1521-9615
    Electronic ISSN: 1558-366X
    Topics: Computer Science , Natural Sciences in General , Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 48
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: Despite the effectiveness of convolutional neural networks (CNNs), especially for image classification tasks, the effect of convolution features on learned representations is still limited, mainly focusing on an images salient object but ignoring the variation information from clutter and local objects. The authors propose a multiple vector of locally aggregated descriptors (VLAD) encoding method with CNN features for image classification. To improve the VLAD coding methods performance, they explore the multiplicity of VLAD encoding with the extension of three encoding algorithms. Moreover, they equip the spatial pyramid patch (SPM) on VLAD encoding to add spatial information to CNN features. The addition of SPM, in particular, allows their proposed framework to yield better performance compared to the traditional method.
    Print ISSN: 1521-9615
    Electronic ISSN: 1558-366X
    Topics: Computer Science , Natural Sciences in General , Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 49
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: Use of the Python language in scientific computing has always been characterized by the coexistence of interpreted Python code and compiled native code, written in languages like C or Fortran. This column takes a fresh look at the problem and introduces Pythran, a new optimization tool designed to efficiently handle unmodified Python code.
    Print ISSN: 1521-9615
    Electronic ISSN: 1558-366X
    Topics: Computer Science , Natural Sciences in General , Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 50
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Print ISSN: 1521-9615
    Electronic ISSN: 1558-366X
    Topics: Computer Science , Natural Sciences in General , Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 51
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: Despite the increasing importance of in silico experiments to the scientific discovery process, state-of-the-art software engineering practices are rarely adopted in computational science. To understand the underlying causes for this situation and to identify ways to improve it, the authors conducted a literature survey on software engineering practices in computational science. They identified 13 recurring key characteristics of scientific software development that are the result of the nature of scientific challenges, the limitations of computers, and the cultural environment of scientific software development. Their findings allow them to point out shortcomings of existing approaches for bridging the gap between software engineering and computational science and to provide an outlook on promising research directions that could contribute to improving the current situation.
    Print ISSN: 1521-9615
    Electronic ISSN: 1558-366X
    Topics: Computer Science , Natural Sciences in General , Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 52
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Print ISSN: 1521-9615
    Electronic ISSN: 1558-366X
    Topics: Computer Science , Natural Sciences in General , Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 53
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Print ISSN: 0163-6804
    Electronic ISSN: 1558-1896
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 54
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Print ISSN: 0163-6804
    Electronic ISSN: 1558-1896
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 55
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Print ISSN: 0163-6804
    Electronic ISSN: 1558-1896
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 56
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Print ISSN: 0163-6804
    Electronic ISSN: 1558-1896
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 57
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: Non-orthogonal multiple access (NOMA) as an efficient method of radio resource sharing has its roots in network information theory. For generations of wireless communication systems design, orthogonal multiple access schemes in the time, frequency, or code domain have been the main choices due to the limited processing capability in the transceiver hardware, as well as the modest traffic demands in both latency and connectivity. However, for the next generation radio systems, given its vision to connect everything and the much evolved hardware capability, NOMA has been identified as a promising technology to help achieve all the targets in system capacity, user connectivity, and service latency. This article provides a systematic overview of the state-of-theart design of the NOMA transmission based on a unified transceiver design framework, the related standardization progress, and some promising use cases in future cellular networks, based on which interested researchers can get a quick start in this area.
    Print ISSN: 0163-6804
    Electronic ISSN: 1558-1896
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 58
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: Availability of widely harmonized mobile spectrum is crucial for the success of 5G mobile communications, fulfilling the visions and requirements and delivering the full range of potential capabilities for 5G. This article introduces the global situation of spectrum for 5G, both below and above 6 GHz, in both the regulatory status and technical aspects. In particular, the technical challenges of supporting 5G in millimeter-wave spectrum, such as coverage limitation and implementation aspects, are discussed.
    Print ISSN: 0163-6804
    Electronic ISSN: 1558-1896
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 59
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: Turbo codes, prevalent in most modern cellular devices, are set to be replaced by LDPC codes as the code for forward error correction. This transition was ushered in mainly because of the high throughput demands for 5G New Radio (NR). The new channel coding solution also needs to support incremental-redundancy hybrid ARQ, and a wide range of blocklengths and coding rates, with stringent performance guarantees and minimal description complexity. In this article, we first briefly review the requirements of the new channel code for 5G NR. We then describe the LDPC code design philosophy and how the broad requirements of 5G NR channel coding led to the introduction of novel structural features in the code design, culminating in an LDPC code that satisfies all the demands of 5G NR.
    Print ISSN: 0163-6804
    Electronic ISSN: 1558-1896
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 60
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: The 3GPP is in the process of developing the next generation radio access technology, named New Radio (NR), which will be proposed as a candidate technology for IMT-2020. This article outlines the wide bandwidth operation of NR, among other new features being considered, based on the up-to-date discussions and decisions made in 3GPP standardization meetings. The much wider channel bandwidth of NR, compared to LTE, enables more efficient use of resources than the existing carrier aggregation framework with lower control overhead. The support of multiple sub-carrier spacing options allows NR to operate in a wide range of carrier frequency from sub-6 GHz band to mmWave band with appropriate handling of multi-path delay spread and phase noise depending on the carrier frequency. In addition, the introduction of the new bandwidth part concept allows flexible and dynamic configuration of UE's operating bandwidth, which will make NR an energy-efficient solution despite the support of wide bandwidth. Other NR wideband operation related issues, such as the support of UEs with limited RF capability and frequency domain resource indexing, are also explained in this article.
    Print ISSN: 0163-6804
    Electronic ISSN: 1558-1896
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 61
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Print ISSN: 0163-6804
    Electronic ISSN: 1558-1896
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 62
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: 5G radio access networks are expected to provide very high capacity, ultra-reliability and low latency, seamless mobility, and ubiquitous end-user experience anywhere and anytime. Driven by such stringent service requirements coupled with the expected dense deployments and diverse use case scenarios, the architecture of 5G New Radio (NR) wireless access has further evolved from the traditionally cell-centric radio access to a more flexible beam-based user-centric radio access. This article provides an overview of the NR system multi-beam operation in terms of initial access procedures and mechanisms associated with synchronization, system information, and random access. We further discuss inter-cell mobility handling in NR and its reliance on new downlink-based measurements to compensate for a lack of always-on reference signals in NR. Furthermore, we describe some of the user-centric coordinated transmission mechanisms envisioned in NR in order to realize seamless intra/inter-cell handover between physical transmission and reception points and reduce the interference levels across the network.
    Print ISSN: 0163-6804
    Electronic ISSN: 1558-1896
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 63
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: In this paper, we propose a novel correlation particle filter (CPF) for robust visual tracking. Instead of a simple combination of a correlation filter and a particle filter, we exploit and complement the strength of each one. Compared with existing tracking methods based on correlation filters and particle filters, the proposed tracker has four major advantages: 1) it is robust to partial and total occlusions, and can recover from lost tracks by maintaining multiple hypotheses; 2) it can effectively handle large-scale variation via a particle sampling strategy; 3) it can efficiently maintain multiple modes in the posterior density using fewer particles than conventional particle filters, resulting in low computational cost; and 4) it can shepherd the sampled particles toward the modes of the target state distribution using a mixture of correlation filters, resulting in robust tracking performance. Extensive experimental results on challenging benchmark data sets demonstrate that the proposed CPF tracking algorithm performs favorably against the state-of-the-art methods.
    Print ISSN: 1057-7149
    Electronic ISSN: 1941-0042
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 64
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: Noise estimation is crucial in many image processing algorithms such as image denoising. Conventionally, the noise is assumed as a signal-independent additive white Gaussian process. However, for the real raw data of image sensor, the present noise should be practically modeled as signal dependent. In this paper, we propose an effective and fast image sensor noise estimation method for a single raw image. The noise model parameters are estimated via constrained weighted least squares (WLS) fitting on a number of data samples, each of which is generated from a group of weakly textured patches. Specifically, we first design a fast scheme for selecting weakly textured patches, with the guidance of image histogram. To robustly fit the data samples, we then explicitly account for the credibility of each sample by measuring the texture strength of the grouped patches. The image sensor noise estimation is finally formulated as a constrained WLS optimization problem, which can be solved efficiently. Experimental results demonstrate that our method could run much faster than the existing schemes, while retaining the state-of-the-art estimation performance.
    Print ISSN: 1057-7149
    Electronic ISSN: 1941-0042
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 65
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: This paper presents a method of modeling edge profiles with two blur parameters, and estimating and predicting those edge parameters with varying brightness combinations and camera-to-object distances (COD). First, the validity of the edge model is proven mathematically. Then, it is proven experimentally with edges from a set of images captured for specifically designed target sheets and with edges from natural images. Estimation of the two blur parameters for each observed edge profile is performed with a brute-force method to find parameters that produce global minimum errors. Then, using the estimated blur parameters, actual blur parameters of edges with arbitrary brightness combinations are predicted using a surface interpolation method (i.e., kriging). The predicted surfaces show that the two blur parameters of the proposed edge model depend on both dark-side edge brightness and light-side edge brightness following a certain global trend. This is similar across varying CODs. The proposed edge model is compared with a one-blur parameter edge model using experiments of the root mean squared error for fitting the edge models to each observed edge profile. The comparison results suggest that the proposed edge model has superiority over the one-blur parameter edge model in most cases where edges have varying brightness combinations.
    Print ISSN: 1057-7149
    Electronic ISSN: 1941-0042
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 66
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: Optically read out time projection chambers (TPCs) based on gaseous electron multipliers (GEMs) combine 3-D event reconstruction capabilities with high spatial resolution and charge amplification factors. The approach of reconstructing particle tracks from 2-D projections obtained with imaging sensors and depth information from photomultiplier tubes is limited to specific cases such as straight particle trajectories. A combination of optical and electronic readout realized by a semitransparent anode placed between a triple-GEM stack and a camera in an optically read out TPC has been realized and used to reconstruct more complex particle tracks. High spatial resolution 2-D projections combined with a low number of charge readout channels enable accurate 3-D event topology reconstruction. Straight alpha tracks as well as more complex cosmic events have been reconstructed with the presented readout concept. Relative depth information from electronically read out charge signals has been combined with drift time information between primary and secondary scintillation pulses to absolute alpha track reconstructions.
    Print ISSN: 0018-9499
    Electronic ISSN: 1558-1578
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 67
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: Radiation measurements and monitoring are very important for particle physics accelerators, hadron therapy institutes, and nuclear facilities. An Application Specific Integrated Circuit (ASIC) able to digitize current generated from ionization chambers was designed and characterized in order to be used as the front-end of the new radiation monitoring system at CERN. The design of the Utopia 2 ASIC was motivated by the need to measure input currents as low as 2 fA and over a wide dynamic range of 9 decades. This paper presents the challenges, the design procedure, the architecture, and the measurement results of the front-end that was fabricated in AMS 0.35- $mu text{m}$ technology. The main limitation was related to the leakage currents that are injected into the input of the ASIC from various sources and are added to the signal of the detector. By active leakage current compensation, the ASIC can measure current down to 1 fA, and by introducing a multiple range architecture, the ASIC can digitize current up to $5~mu text{A}$ .
    Print ISSN: 0018-9499
    Electronic ISSN: 1558-1578
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 68
    Publication Date: 2018-03-16
    Description: The mass thickness and atomic number of materials shielding radioactive sources emitting multiple resolvable gamma-ray energies can be characterized by measuring the attenuation and Compton scatter of emitted gamma rays in recorded spectra against estimated values for a suite of materials and thicknesses. Compton imaging using a maximum-likelihood expectation maximization-based reconstruction can be used to separate angular spectra allowing simultaneous characterization of multiple shielded sources. Using the described algorithm on experimental 133 Ba data, we demonstrate estimation of mass thickness and atomic number for iron, tin, and lead shields with another bare source in the field of view with average standard error of 0.6 g/cm 2 and 1.5, respectively, while an aluminum shield is reconstructed with ambiguous atomic number but correct thickness.
    Print ISSN: 0018-9499
    Electronic ISSN: 1558-1578
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 69
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: AREVA Mines and the Nuclear Measurement Laboratory of CEA Cadarache are collaborating to improve the sensitivity and precision of uranium concentration measurement by means of gamma-ray logging. The determination of uranium concentration in boreholes is performed with the Natural Gamma Ray Sonde (NGRS) based on a NaI(Tl) scintillation detector. The total gamma count rate is converted into uranium concentration using a calibration coefficient measured in concrete blocks with known uranium concentration in the AREVA Mines calibration facility located in Bessines, France. Until now, to take into account gamma attenuation in a variety of boreholes diameters, tubing materials, diameters and thicknesses, filling fluid densities, and compositions, a semiempirical formula was used to correct the calibration coefficient measured in Bessines facility. In this paper, we propose to use Monte Carlo simulations to improve gamma attenuation corrections. To this purpose, the NGRS probe and the calibration measurements in the standard concrete blocks have been modeled with Monte Carlo N-Particles (MCNP) computer code. The calibration coefficient determined by simulation 5.3 $text{s}^{-1}cdot text {ppm}_{U}^{-1}$ with 10% accuracy is in good agreement with the one measured in Bessines (and for which no uncertainty was provided), 5.2 $text{s}^{-1}cdot text {ppm}_{U}^{-1}$ . The calculations indicate that the concrete blocks used for measuring the calibration coefficients measured in Bessines are underestimated by about 10%. Based on the validated MCNP model, several parametric studies have been performed. For instance, the rock density and chemical composition proved to have a limited impact on the calibration coefficient. However, gamma self-absorption in uranium leads to a nonlinear relationship - etween count rate and uranium concentration beyond approximately 1% of uranium weight fraction, the underestimation of the uranium content reaching more than a factor 2.5 for a 50% uranium weight fraction. Parametric studies have also been performed with different tubing materials, diameters, and thicknesses, as well as different borehole filling fluids representative of real measurement conditions, in view to validate gamma attenuation corrections based on the semiempirical formula. In addition, a multilinear analysis approach has been tested to further improve accuracy on uranium concentration determination, leading to only a few percent uncertainties on a large range of configurations.
    Print ISSN: 0018-9499
    Electronic ISSN: 1558-1578
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 70
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: Cone-beam computed tomography (CBCT) plays a critical role in both medical imaging and industrial nondestructive testing with high efficiency and precision. However, scattering poses a significant limitation to image quality. In order to get the complete scattering information when the object is scanned, a simple scattering correction method based on compressed sensing (CS) is proposed, which is based on the assumption that the object scattering (OS) is eliminated by the lead collimator. In the process, the additional scattering from shadow area is first estimated, and then the OS is obtained by using the information in the irradiated area (with the strips pattern) extracted from the primary projection (without the strips pattern). Then, the estimated scatterings are subtracted from each primary projection data to yield an estimate for CBCT reconstruction, and the scattering-corrected CBCT volume is reconstructed by using an alternating direction method of multipliers algorithm. Finally, experimental studies are performed to evaluate the performance of the proposed schemes which has reduced the scattering artifacts. For an aluminum sample, the average gradient (AG) and contrast-to-noise ratio (CNR) were increased by 60% and 80%; for titanium, the AG and signal-to-noise ratio (SNR) were increased by 60% and 20%; and for iron, the AG, CNR, and SNR were increased by 30%–50%. Moreover, this paper studies long-span information sensing by replacing the interpolation algorithm with CS theory; it can provide a certain theoretical guidance for the sparse data recovery and mining.
    Print ISSN: 0018-9499
    Electronic ISSN: 1558-1578
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 71
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: Thallium bromide (TlBr) is an attractive material for room-temperature semiconductor radiation detection due to its high atomic number and density. Performance of better than 1% full-width at half maximum at 662 keV has been measured on $sim 5 times 5 times 5$ mm 3 pixelated TlBr detectors. Though most TlBr detectors show expected performance, a few detectors have high-energy tails on their photopeaks which are caused by nonflat tails on anode waveforms. The properties of these anode tails are studied and the generation of extra electrons by the movement of holes is proposed to explain the observations. The detector is operated in reverse bias (with holes drifting toward the pixelated electrode) to help confirm these observations and a mechanism for correcting preamplifier decay from long collection time digital waveforms is developed and used in the analysis.
    Print ISSN: 0018-9499
    Electronic ISSN: 1558-1578
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 72
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: These instructions give guidelines for preparing papers for this publication. Presents information for authors publishing in this journal.
    Print ISSN: 0018-9499
    Electronic ISSN: 1558-1578
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 73
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: Aim: A method to determine the point spread function (PSF) of an imaging system based on a set of 3-D Gaussian functions is presented for a robust estimation of the recovery corrections for accurate activity quantification in positron emission tomography (PET) and single-photon emission computed tomography systems. Materials and Methods: The spatial resolution of the ALBIRA II PET subsystem was determined using a 370-kBq 22 Na point source. The measured data were reconstructed with a maximum-likelihood expectation-maximization algorithm. The PSF was calculated based on the National Electrical Manufacturing Association (NEMA) NU-4 2008 protocol and on alternative methods based on three 3-D fitting functions for the xyz-directions: 1) a 3-D Gaussian function (3-D 1-Gauss) and convolutions of this function with a pixel size (3-D ${text {Gauss}}_{p}$ ) or source dimension of Ø 0.25 mm (3-D ${text {Gauss}}_{s}$ ); 2) the sum of two Gaussian functions (3-D 2-Gauss); and 3) three Gaussian functions (3-D 3-Gauss). Goodness of fit and the method based on an Akaike information criterion were used for choosing the best function. A MATLAB-based mathematical source simulation study was performed to quantify the relevance of PSFs calculated from the different methods. Results: Based on the PSFs calculated from the NEMA protocol, the full-width at half-maximum (FWHM) in xyz-directions were 1.68, 1.51, and 1.50 mm. The corresponding results using 3-D Gauss and 3-D ${text {Gauss}}_{s}$ functions both were (1.87 ± 0.01), (1.70 ± 0.01), and (1.50 ± 0.01) mm and for 3-D ${text {Gauss}}_{p}$ were (1.84 ± 0.01), (1.67 ± 0.01), and (1.47 ± 0.01) mm. The FWHMs calculated with 3-D 2-Gauss and 3-D 3-Gauss were (1.78 ± 0.01), (1.74 ± 0.01), and (1.83 ± 0.01) mm and (1.76 ± 0.03), (1.72 ± 0.03), and (1.78 ± 0.03) mm, respectively. All coefficients of variations of the fit parameters were ≤29% and the adjusted $R^{2}$ were ≥0.99. Based on Akaike weights $w_{i}$ , the 3-D 3-Gauss method was best supported by the data ( $w_{i} = 100$ %). The simulation study showed a relative error in quantification of spherical lesions in the range of 15%–45% for lesions of diameters 1–5 mm compared to the PSFs based on the NEMA method. Conclusion: An alternative method to calculate the PSFs of imaging systems to accurately correct for recovery effects is presented. The proposed method includes choosing and fitting of 3-D functions, validation of fitting quality, and choosing the function best supported by the data along with an estimation of the uncertainty.
    Print ISSN: 0018-9499
    Electronic ISSN: 1558-1578
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 74
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: Describes the above-named upcoming conference event. May include topics to be covered or calls for papers.
    Print ISSN: 0018-9499
    Electronic ISSN: 1558-1578
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Physics
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 75
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-16
    Description: A novel and low-cost fiber birefringence measurement scheme is proposed and studied by a polarimetric fiber ring laser interrogated by the beat frequency technique. For the fiber ring laser, modes splitting occur between two orthogonal polarization modes because of intrinsic fiber birefringence. As a result, two types of beat frequency signals (i.e., longitudinal mode beat frequency and polarization mode beat frequency signals) are generated simultaneously. The principle of measurement of fiber birefringence by the fiber ring laser has been analyzed theoretically in detail. Two alternative expressions for fiber birefringence change are obtained, which is very convenient for users to choose different order longitudinal and polarization mode beat frequency signals. The variation of fiber birefringence caused by applied strain has been calculated in terms of beat frequency shift. To validate the proposed sensing system, the strain-induced fiber birefringence change in commercial Erbium-doped fiber is investigated and obtained by measuring frequency shift of two types of beat frequency signals. The experimental results show that the fiber birefringence experiences a linear decrease when the applied strain is increased. A strain response coefficient of –1.756 × 10 –11 / μϵ is obtained. The proposed sensing scheme has obvious advantages of simple structure, low cost, and high sensitivity and it will provide great convenience for measuring fiber birefringence for short-length single mode fiber.
    Print ISSN: 0733-8724
    Electronic ISSN: 1558-2213
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 76
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Presents the introductory editorial for this issue of the publication.
    Print ISSN: 1053-5888
    Electronic ISSN: 1558-0792
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 77
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Presents a listing of SPS society members who were elevated to the status of IEEE Fellow in 2018.
    Print ISSN: 1053-5888
    Electronic ISSN: 1558-0792
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 78
    Publication Date: 2018-03-13
    Description: In an era of ubiquitous video, audio is often relegated to a secondary role. Yet electronic audio in all of its various forms is now staging a strong comeback as listeners, increasingly dissatisfied with the output of highly compressed audio files and streams, seek higher sound quality on all types of fixed and mobile platforms. Signal processing is largely responsible for taking audio in all of its forms to new levels of quality. On the cutting edge of audio research is spatial audio, or ambisonics, a technique that takes a dimensional approach to sound, mimicking the way people hear in real life. By channeling the characteristics of sound as it travels through space and time, ambisonics envelops listeners inside a threedimensional (3-D) audio sphere that makes recorded music sound startlingly natural in whatever setting it’s used.
    Print ISSN: 1053-5888
    Electronic ISSN: 1558-0792
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 79
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Reservoir characterization (RC) is a process of finding petrophysical properties of the subsurface mainly from the seismic and well-log data. The nonlinear and heterogeneous nature of the subsurface is the major bottleneck in estimating the reservoir properties. In the past two decades, the RC has eventually turned out to be an interdisciplinary field of research involving computational science, signal processing, geostatistics, and geophysics. This article provides the interdisciplinary perspective in RC focusing on the applications of signal processing and machine learning (ML). We provide an account of various state-of-the-art algorithms while categorizing them into three stages in an RC framework: preprocessing, prediction, and postprocessing. RC has been known to be a highly data-driven problem. Huge volumes of seismic and well-log data are cleverly integrated by experts to decipher the subsurface properties. Some of the anomalies may lead to the existence of a potential reservoir. The signal processing tools are primarily required for information matching, preprocessing for noise and artifacts, and postprocessing for removing irregularities in the prediction, whereas the ML tools are required to map the seismic data to well logs. This article provides a comprehensive study on the recent advances in RC involving seismic volumes and well logs.
    Print ISSN: 1053-5888
    Electronic ISSN: 1558-0792
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 80
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Profitable production from oil and gas reservoirs is essential in the petroleum industry, and solutions for many reservoir engineering problems rely on an accurate estimation of rock's physical properties. Traditional property estimation using conventional laboratory measurements has a high turnover time. Furthermore, conventional methods often make simplified assumptions and lack a detailed understanding of the internal mechanisms influencing estimated properties. Digital rock physics (DRP) allows for an alternative strategy for estimating these properties by using high-resolution computerized tomography (CT) scanners.
    Print ISSN: 1053-5888
    Electronic ISSN: 1558-0792
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 81
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Various puzzles, games, humorous definitions, or mathematical that should engage the interest of readers.
    Print ISSN: 1053-5888
    Electronic ISSN: 1558-0792
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 82
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: This article describes the basic principles of ultrasound thermography (UST) and its real-time implementation using graphics processing unit (GPU)-enabled software architecture. In medicine, the term thermography is mostly associated with heat-sensing infrared cameras for recording surface temperature changes. In this article, we use this term to describe the qualitative noninvasive imaging of tissue temperature change using any imaging modality. Examples of these modalities include microwave radiometry, magnetic resonance imaging (MRI), US imaging, and photoacoustic tomography. Of these imaging methods, US and MR are the most widely investigated. Table S1 in "Real-Time Thermography in Medicine" lists some US- and MRbased methods for tissue thermography reported in recent literature.
    Print ISSN: 1053-5888
    Electronic ISSN: 1558-0792
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 83
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2018-03-13
    Description: Presents SPS society upcoming meetings and events.
    Print ISSN: 1053-5888
    Electronic ISSN: 1558-0792
    Topics: Electrical Engineering, Measurement and Control Technology
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 84
    facet.materialart.
    facet.materialart.
    Institute of Electrical and Electronics Engineers (IEEE)