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  • 1
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    Sustainability, Vol. 10, Pages 78: A Model of Market Positioning of Destinations Based on Online Customer Reviews of Lodgings (2017)
    MDPI Publishing
    Details
    Publication Date: 2017-12-30
    Description: Sustainability, Vol. 10, Pages 78: A Model of Market Positioning of Destinations Based on Online Customer Reviews of Lodgings Sustainability doi: 10.3390/su10010078 Authors: Manuel Rodríguez-Díaz Rosa Rodríguez-Díaz Ana Rodríguez-Voltes Crina Rodríguez-Voltes The aim of this study is to develop a methodology to determine the competitive online positioning of lodging companies in different tourist destinations. The rise of the digital age has allowed many customers to share their opinions through specialized websites, providing a dynamic and constantly updated evaluation of the market. In this context, competitiveness is an essential factor in the economic sustainability of destinations. The competitive positioning of destinations is determined by the scale of variables used by Booking.com. The price and lodging category variables are also used, as well as three new variables derived from the initial scale: the quality average, value and added value. This methodology provides a tool to determine the level of competitiveness of the lodging offered in tourist destinations, based on which, actions can be taken to improve destinations’ positioning.
    Electronic ISSN: 2071-1050
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by MDPI Publishing
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  • 2
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    IJERPH, Vol. 13, Pages 803: PHACTR1 Gene Polymorphism Is Associated with Increased Risk of Developing Premature Coronary Artery Disease in Mexican Population (2016)
    MDPI Publishing
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    Publication Date: 2016-08-10
    Description: Single-nucleotide polymorphisms (SNPs) in the protein phosphatase and actin regulator 1 gene (PHACTR1) have been associated with susceptibility to develop several diseases, including cardiovascular disease. The purpose of this study was to evaluate the role of two polymorphisms (rs2026458 and rs9349379) of the PHACTR1 gene in the susceptibility to the risk of developing premature coronary artery disease (CAD) in the Mexican population. The genotype analysis was performed using 5’exonuclease TaqMan genotyping assays in a group of 994 patients with premature CAD and 703 controls. A similar genotype distribution of rs2026458 was observed in both groups; however, under an additive model adjusted by age, body mass index, type 2 diabetes mellitus, smoking, dyslipidemia, and hypertension, the rs9349379 G allele was associated with a higher risk for developing premature CAD (odds ratio (OR) = 1.22, 95% confidence interval (CI) = 1.03–1.46, p-value (p) = 0.024). The two PHACTR1 polymorphisms were not in linkage disequilibrium. In summary, our results suggest that the PHACTR1 rs9349379 polymorphism plays an important role in the risk of developing premature CAD in the Mexican population.
    Print ISSN: 1661-7827
    Electronic ISSN: 1660-4601
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Published by MDPI Publishing
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  • 3
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    Sustainability, Vol. 10, Pages 2789: In Vivo Cytotoxicity Induced by 60 Hz Electromagnetic Fields under a High-Voltage Substation Environment (2018)
    MDPI Publishing
    Details
    Publication Date: 2018-08-08
    Description: Sustainability, Vol. 10, Pages 2789: In Vivo Cytotoxicity Induced by 60 Hz Electromagnetic Fields under a High-Voltage Substation Environment Sustainability doi: 10.3390/su10082789 Authors: J. Antonio Heredia-Rojas Abraham Octavio Rodríguez-De la Fuente Ricardo Gomez-Flores Omar Heredia-Rodríguez Laura E. Rodríguez-Flores Michaela Beltcheva Ma. Esperanza Castañeda-Garza Living beings permanently receive electromagnetic radiation, particularly from extremely low-frequency electromagnetic fields (ELF-EMFs), which may cause adverse health effects. In this work, we studied the in vivo cytotoxic effects of exposing BALB/c mice to 60 Hz and 8.8 µT EMFs during 72 h and 240 h in a switchyard area, using animals exposed to 60 Hz and 2.0 mT EMFs or treated with 5 mg/kg mitomycin C (MMC) as positive controls. Micronucleus (MN) frequency and male germ cell analyses were used as cytological endpoints. ELF-EMF exposure was observed to significantly (p < 0.05) increase MN frequency at all conditions tested, with the 2 mT/72 h treatment causing the highest response, as compared with untreated control. In addition, increased sperm counts were observed after switchyard area ELF-EMF exposure, as compared with untreated control. In contrast, low sperm counts were obtained for 72 h/2.0 mT-exposed animals and for MMC-treated mice (p < 0.05), without altering male germ cell morphological characteristics.
    Electronic ISSN: 2071-1050
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by MDPI Publishing
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  • 4
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    Sustainability, Vol. 10, Pages 1603: Gap Analysis of the Online Reputation (2018)
    MDPI Publishing
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    Publication Date: 2018-05-17
    Description: Sustainability, Vol. 10, Pages 1603: Gap Analysis of the Online Reputation Sustainability doi: 10.3390/su10051603 Authors: Manuel Rodríguez-Díaz Crina Isabel Rodríguez-Voltes Ana Cristina Rodríguez-Voltes Online reputation is a strategic element of firms’ competitiveness. Companies need to manage their reputations and the image that they communicate through the Internet. This paper proposes a model to determine the main aspects that define a competitive online reputation: coherence, veracity, and intensity. The traditional methods that have been used to determine service quality must be adapted to new digital developments and their effects on customers’ behavior. Therefore, a gap analysis is performed to define the key aspects that must be managed in order to create and maintain a powerful reputation and image in the companies’ communication. Since this subject is too complex to be implemented in distinct sectors and ambits, different lines of research are proposed to expand this new critical line of study.
    Electronic ISSN: 2071-1050
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by MDPI Publishing
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  • 5
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    Sensors, Vol. 17, Pages 2749: Mathematical Model for Localised and Surface Heat Flux of the Human Body Obtained from Measurements Performed with a Calorimetry Minisensor (2017)
    MDPI Publishing
    In: Sensors
    Details
    Publication Date: 2017-11-29
    Description: Sensors, Vol. 17, Pages 2749: Mathematical Model for Localised and Surface Heat Flux of the Human Body Obtained from Measurements Performed with a Calorimetry Minisensor Sensors doi: 10.3390/s17122749 Authors: Fabiola Socorro Pedro Rodríguez de Rivera Miriam Rodríguez de Rivera Manuel Rodríguez de Rivera The accuracy of the direct and local measurements of the heat power dissipated by the surface of the human body, using a calorimetry minisensor, is directly related to the calibration rigor of the sensor and the correct interpretation of the experimental results. For this, it is necessary to know the characteristics of the body’s local heat dissipation. When the sensor is placed on the surface of the human body, the body reacts until a steady state is reached. We propose a mathematical model that represents the rate of heat flow at a given location on the surface of a human body by the sum of a series of exponentials: W(t) = A0 + ∑Aiexp(−t/τi). In this way, transient and steady states of heat dissipation can be interpreted. This hypothesis has been tested by simulating the operation of the sensor. At the steady state, the power detected in the measurement area (4 cm2) varies depending on the sensor’s thermostat temperature, as well as the physical state of the subject. For instance, for a thermostat temperature of 24 °C, this power can vary between 100–250 mW in a healthy adult. In the transient state, two exponentials are sufficient to represent this dissipation, with 3 and 70 s being the mean values of its time constants.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Published by MDPI Publishing
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  • 6
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    Sensors, Vol. 15, Pages 10194-10220: Mobile Robot Positioning with 433-MHzWireless Motes with Varying Transmission Powers and a Particle Filter (2015)
    MDPI Publishing
    In: Sensors
    Details
    Publication Date: 2015-05-01
    Description: In wireless positioning systems, the transmitter’s power is usually fixed. In this paper, we explore the use of varying transmission powers to increase the performance of a wireless localization system. To this extent, we have designed a robot positioning system based on wireless motes. Our motes use an inexpensive, low-power sub-1-GHz system-on-chip (CC1110) working in the 433-MHz ISM band. Our localization algorithm is based on a particle filter and infers the robot position by: (1) comparing the power received with the expected one; and (2) integrating the robot displacement. We demonstrate that the use of transmitters that vary their transmission power over time improves the performance of the wireless positioning system significantly, with respect to a system that uses fixed power transmitters. This opens the door for applications where the robot can localize itself actively by requesting the transmitters to change their power in real time.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Published by MDPI Publishing
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  • 7
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    Sensors, Vol. 16, Pages 335: Robot Guidance Using Machine Vision Techniques in Industrial Environments: A Comparative Review (2016)
    MDPI Publishing
    In: Sensors
    Details
    Publication Date: 2016-03-06
    Description: In the factory of the future, most of the operations will be done by autonomous robots that need visual feedback to move around the working space avoiding obstacles, to work collaboratively with humans, to identify and locate the working parts, to complete the information provided by other sensors to improve their positioning accuracy, etc. Different vision techniques, such as photogrammetry, stereo vision, structured light, time of flight and laser triangulation, among others, are widely used for inspection and quality control processes in the industry and now for robot guidance. Choosing which type of vision system to use is highly dependent on the parts that need to be located or measured. Thus, in this paper a comparative review of different machine vision techniques for robot guidance is presented. This work analyzes accuracy, range and weight of the sensors, safety, processing time and environmental influences. Researchers and developers can take it as a background information for their future works.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Published by MDPI Publishing
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  • 8
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    Sustainability, Vol. 8, Pages 951: Determining the Sustainability Factors and Performance of a Tourism Destination from the Stakeholders’ Perspective (2016)
    MDPI Publishing
    Details
    Publication Date: 2016-09-20
    Description: The competitiveness of a tourism destination depends on the sustainability of its economic and environmental resources. The aim of this paper is to determine the key factors in achieving the sustainability of a tourism destination in relation to the performance obtained. A methodology based on the opinions of stakeholders is developed to determine the sustainability factors and performance in the tourism destination of Gran Canaria. The variables used in the study are related to the environmental resources, the principal agents in the tourism supply chain, the governance of the destination, and the complementary characteristics that improve the competitiveness of the tourism destination, as well as the dimensions that determine security. Performance is measured by stakeholders from two perspectives, the destination and the customers, in order to establish the main variables that will influence the destination’s sustainability. The key sustainability factors were identified, and a regression analysis determined that there was a positive influence on long-term performance. The results showed that the key factors that have a direct and significant relationship with performance are the key resources and supply chain, security, alternative leisure, and governance.
    Electronic ISSN: 2071-1050
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by MDPI Publishing
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  • 9
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    Materials, Vol. 8, Pages 4258-4272: Photophysical Study of Polymer-Based Solar Cells with an Organo-Boron Molecule in the Active Layer (2015)
    MDPI Publishing
    In: Materials
    Details
    Publication Date: 2015-07-14
    Description: Our group previously reported the synthesis of four polythiophene derivatives (P1–P4) used for solar cells. The cells were prepared under room conditions by spin coating, leading to low efficiencies. However, after the addition of 6-nitro-3-(E)-3-(4-dimethylaminophenyl)allylidene)-2,3-dihydrobenzo[d]-[1,3,2] oxazaborole (M1) to their active layers, the efficiencies of the cells showed approximately a two-fold improvement. In this paper, we study this enhancement mechanism by performing ultrafast transient absorption (TA) experiments on the active layer of the different cells. Our samples consisted of thin films of a mixture of PC61BM with the polythiophenes derivatives P1–P4. We prepared two versions of each sample, one including the molecule M1 and another without it. The TA data suggests that the efficiency improvement after addition of M1 is due not only to an extended absorption spectrum towards the infrared region causing a larger population of excitons but also to the possible creation of additional channels for transport of excitons and/or electrons to the PC61BM interface.
    Electronic ISSN: 1996-1944
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by MDPI Publishing
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  • 10
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    Sensors, Vol. 12, Pages 7648-7668: A Communication Model to Integrate the Request-Response and the Publish-Subscribe Paradigms into Ubiquitous Systems (2012)
    MDPI Publishing
    In: Sensors
    Details
    Publication Date: 2012-06-30
    Description: The Request-Response (RR) paradigm is widely used in ubiquitous systems to exchange information in a secure, reliable and timely manner. Nonetheless, there is also an emerging need for adopting the Publish-Subscribe (PubSub) paradigm in this kind of systems, due to the advantages that this paradigm offers in supporting mobility by means of asynchronous, non-blocking and one-to-many message distribution semantics for event notification. This paper analyzes the strengths and weaknesses of both the RR and PubSub paradigms to support communications in ubiquitous systems and proposes an abstract communication model in order to enable their seamless integration. Thus, developers will be focused on communication semantics and the required quality properties, rather than be concerned about specific communication mechanisms. The aim is to provide developers with abstractions intended to decrease the complexity of integrating different communication paradigms commonly needed in ubiquitous systems. The proposal has been applied to implement a middleware and a real home automation system to show its applicability and benefits.
    Electronic ISSN: 1424-8220
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Published by MDPI Publishing
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