ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
  • 1
    ISSN: 1573-7640
    Keywords: Communicating sequential processes ; data-driven evaluation ; fairness ; generalized guarded commands ; liveness ; performance evaluation ; safety
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Earlier approaches to execute generalized alternative/repetitive commands of Communicating Sequential Processes (CSP) attempt the selection of guards in a sequential order. Also, these implementations are based on either shared memory or message passing multiprocessor systems. In contrast, we propose an implementation of generalized guarded commands using the data-driven model of computation. A significant feature of our implementation is that it attempts the selection of the guards of a process in parallel. We prove that our implementation is faithful to the semantics of the generalized guarded commands. Further, we have simulated the implementation using discrete-event simulation and measured various performance parameters. The measured parameters are helpful in establishing the fairness of our implementation and its superiority, in terms of efficiency and the parallelism exploited, over other implementations. The simulation study is also helpful in identifying various issues that affect the performance of our implementation. Based on this study, we have proposed an adaptive algorithm which dynamically tunes the extent of parallelism in the implementation to achieve an optimum level of performance.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1573-5176
    Keywords: algal culture ; cell counting ; growth rate measurements ; image analysis ; microcomputer ; morphology ; video microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A largely unexplored area is the application of digital image processing to counting and sizing of microalgal cells from culture. Commercial systems are available, but have not been tested, nor necessarily optimized for high speed counting and sizing of phytoplankton. The present work describes the design, construction, specifications and comparative performance of an inexpensive system optimized for counting and sizing microalgal cells. This system has been tested with cells of the picoplankton to nanoplankton size ranges (1–20 μm). The hardware was a widely available standard microcomputer, an inexpensive video camera and monitor, and a video digitization board (frame grabber). A modifiable menu-driven program (PHYCOUNT) was written and provisions made to make this program available to other workers. The program is constructed such that it can be adapted to a variety of hardware setups Video digitization boards). Comparison of growth curves for microagae revealed there were no significant differences in division rate and cell yield as assessed by the image analysis method compared to manual counts with a hemacytometer. Several hundred cells were counted routinely within 10–15 s, far exceeding the counting rate achieved by hand tally. A variable transect feature allowed sampling every nth pixel and provided a substantial increase in execution speed. More than 1000 counts can be done per day. A protocol for the use of 96-well plates of polyvinyl chloride as counting chambers contributed to the processing of large numbers of samples rapidly. Other routines developed provided subtended area, defined the coordinates of cell perimeter, and derived cell length and width. The calculation of the latter two parameters was usually done off-line as data output is in standard numerical form accessible by other programs. Experience with daily use of the PHYCOUNT program and imaging hardware reveal that the system is reliable for cell counting and sizing. The presence of bacteria in the algal cultures does not affect cell counting or sizing.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1573-6865
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The immunohistochemical expression of MAM-3 and MAM-6 antigens was studied in developing human fetal salivary gland removed at autopsy of 22 normal fetuses of varying maturity (10–40 weeks of gestation). The onset of functional maturation in the fetal gland was seen at 21 weeks of gestational maturity. The acini and ducts then underwent distinct alterations in antigen expression with growth and maturation until the late developmental stage (33–40 weeks of gestation) when they resemble the adult salivary gland. The role of maturing duct cells in histogenesis of salivary gland tumours is discussed.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 1573-7640
    Keywords: MMX instruction set ; subword parallelism ; vectorizing compiler
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract In this paper, we present an implementation of a vectorizing C compiler for Intel's MMX (Multimedia Extension). This compiler would identify data parallel sections of the code using scalar and array dependence analysis. To enhance the scope for application of the subword semantics, our compiler performs several code transformations. These include strip mining, scalar expansion, grouping and reduction, and distribution. Thereafter inline assembly instructions corresponding to the data parallel sections are generated. We have used the Stanford University Intermediate Format (SUIF), a public domain compiler tool, for our implementation. We evaluated the performance of the code generated by our compiler for a number of benchmarks. Initial performance results reveal that our compiler generated code produces a reasonable performance improvement (speedup of 2 to 6.5) over the the code generated without the vectorizing transformations/inline assembly. In certain cases, the performance of the compiler generated code is within 85% of the hand-tuned code for MMX architecture.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 1573-7640
    Keywords: instruction-level parallelism ; software pipelining ; classical pipeline theory ; co-scheduling ; VLIW/superscalar architectures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Instruction scheduling methods which use the concepts developed by the classical pipeline theory have been proposed for architectures involving deeply pipelined function units. These methods rely on the construction of state diagrams (or automatons) to (i) efficiently represent the complex resource usage pattern; and (ii) analyze legal initiation sequences, i.e., those which do not cause a structural hazard. In this paper, we propose a state-diagram based approach for modulo scheduling or software pipelining, an instruction scheduling method for loops. Our approach adapts the classical pipeline theory for modulo scheduling, and, hence, the resulting theory is called Modulo-Scheduled pipeline (MS-pipeline) theory. The state diagram, called the Modulo-Scheduled (MS) state diagram is helpful in identifying legal initiation or latency sequences, that improve the number of instructions initiated in a pipeline. An efficient method, called Co-scheduling, which uses the legal initiation sequences as guidelines for constructing software pipelined schedules has been proposed in this paper. However, the complexity of the constructed MS-state diagram limits the usefulness of our Co-scheduling method. Further analysis of the MS-pipeline theory, reveals that the space complexity of the MS-state diagram can be significantly reduced by identifying primary paths. We develop the underlying theory to establish that the reduced MS-state diagram consisting only of primary paths is complete; i.e., it retains all the useful information represented by the original state diagram as far as scheduling of operations is concerned. Our experiments show that the number of paths in the reduced state diagram is significantly lower—by 1 to 3 orders of magnitude—compared to the number of paths in the original state diagram. The reduction in the state diagram facilitate the Co-scheduling method to consider multiple initiations sequences, and hence obtain more efficient schedules. We call the resulting method, enhanced Co-scheduling. The enhanced Co-scheduling method produced efficient schedules when tested on a set of 1153 benchmark loops. Further the schedules produced by this method are significantly better than those produced by Huff's Slack Scheduling method, a competitive software pipelining method, in terms of both the initiation interval of the schedules and the time taken to construct them.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    facet.materialart.
    Unknown
    Cambridge, Mass. : Periodicals Archive Online (PAO)
    Sloan management review. 29:3 (1988:Spring) 19 
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 1573-2614
    Keywords: respiratory monitoring ; real-time kernel ; multi-tasking ; graphical workstation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Medicine
    Notes: Abstract We have applied advanced real-time techniques in softwave, that are intensively used in critical areas like space research and defence applications, to realise an Integrated Real-Time Respiratory Monitoring System at the Thorax Anesthesiology, Academic Hospital Rotterdam. The system is called the ‘SERVO WINDOW’ —a window to the servo ventilator. The heart of the system is a real-time kernel that uses preemptive scheduling to achieve multitasking on a IBMPC compatible hardware platform. To the clinician this means that he gets all relevant information from one source i.e. the Respiratory Workstation. The waveforms of the airway pressure, airway flow and the expired CO2 curve are displayed continuously on the screen. The Vector Loops like Pressure Volume, Flow Pressure and Flow Volume loops are also available in addition to the lung mechanics parameters like Expiratory and Inspiratory Resistances, Compliance, Peak Pressure, PEEP, etc. The Single Breath Diagram i.e. expired CO2 concentration versus volume and dead space ventilation is also calculated. The blood gas analysis data is plotted in convenient diagrams like the O2−CO2 diagram, Oxygen Chart, etc. The trend of all these parameters are available with a granularity of one minute. An industry standard laser printer is used for report generation to produce reports of the real-time waveforms, parameter values and the trends. User interface is through easy menus with the traditional keyboard, touchscreen including keyborad on screen for data entry and the mouse.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1573-4919
    Keywords: Pb ; dopamine biosynthesis ; tyrosine hydroxylase ; brain ; SDS-PAGE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Our previous studies have shown that exposure to low levels of Pb results in significant reductions in dopamine (DA) and its metabolites (3,4-dihyroxyphenylacetic acid, DOPAC and homovanillic acid, HVA) in nucleus acumbens (NA). This area of brain receives dopaminergic projections from the ventral tegmentum and is considered vital in manifestation of many behavioral responses. Similarly, basal and K+-induced release of DA was found significantly reduced in the Pb-exposed rats as compared to the controls in this brain region. Additional studies indicated that acute infusion of Pb in nucleus acumbens caused significant release of DA. Based on these observations it was postulated that the reductions in DA contents and in the basal and stimulus-induced release of DA in NA were manifestations of attenuated dopaminergic activity in this brain region. However, the mechanism of this attenuation is not yet clear. Studies reported here were designed to evaluate the role of a key regulatory enzy me in biosynthesis of DA, i.e. tyrosine hydroxylase (TH) in Pb-induced reductions in dopaminergic activity. The results of these studies indicated that 50 and 500 ppm Pb produced 22.8 and 56% inhibition of TH activity in vitro respectively, and that the enzyme activity was reduced to 43% in rats exposed to 50 ppm lead for 30 days as compared to the controls. The alterations in TH activity in Pb-exposed animals were further confirmed by Western blot analysis. Collectively, these results suggest that Pb-induced inhibition of TH activity in rat brain may contribute to the reductions in dopaminergic activity observed in Pb-exposed animals. (Mol Cell Biochem 175: 137–141, 1997)
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 1573-4919
    Keywords: brain ; pb ; tyrosine hydroxylase ; SDS-PAGE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Previous studies from our laboratory showed that subchronic exposure to low levels of Pb resulted in significant decrease in dopamine (DA) content, attenuation of stimulus-induced release of DA in the dopaminergic projection area of nucleus accumbens (NA), and alterations in tyrosine hydroxylase (TH) activity in rat whole brain homogenates. The present study reported here was conducted to assess the functional integrity of DA synthesis in different brain regions of rats subchronically (90-days) exposed to 50 ppm Pb by measuring the activity of the rate limiting enzyme, tyrosine hydroxylase, in seven brain regions. In Pb-exposed rats, TH activity was reduced in two of the seven brain regions investigated, i.e., nucleus accumbens (42% reduction) and frontal cortex (61% reduction) when compared to controls. In contrast, Pb exposure did not affect the TH activity in cerebellum, brainstem, hippocampus, hypothalamus and striatum. The changes in TH activity in nucleus accumbens (NA) and frontal cortex (FC) in Pb-exposed rats were further confirmed by Western blot analysis using TH polyclonal antibody. Collectively, these results indicate that low level subchronic Pb exposure may affect TH protein in these brain regions.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    ISSN: 1573-5036
    Keywords: Azotobacter chroococcum ; Foliar spray ; Rice ; Water hyacinth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A field experiment was conducted with ADT-31 rice variety. Foliar spray ofAzotobacter chroococcum was applied on 15th, 30th and 45th day after transplanting of rice crop. The foliar spray of Azotobacter culture significantly increased the grain and straw yield of rice crop.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...