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Search Results: 1 - 10 of 1236 matches for " ITS "
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Reflexiones sobre las actitudes del médico en la consulta de pacientes con enfermedades de transmisión sexual
Federico Díaz González
Iatreia , 1997,
Actualización sobre infecciones de transmisión sexual (ITS): transmisión de virus de ITS por sexo oral
Federico Díaz Gonzalez
Iatreia , 1998,
Test a Queue Detection System for Special Events in Nevada  [PDF]
Hualiang (Harry) Teng, Xuecai Xu, Venkatesan Muthukumar, A. Reed Gibby
Journal of Transportation Technologies (JTTs) , 2014, DOI: 10.4236/jtts.2014.41013

Queue detection systems have been used in traffic management in work zones and have also been recommended for traffic control for special events like sports and conventions. However, they have not been tested in the field. This paper presents the results of tests for a queue detection system at two special events in Las Vegas, Nevada. The system consisted of two vision detectors, radio frequency communications and one changeable message sign. Two aspects of the system were evaluated: the effectiveness of the system in reducing speeds and the cost and effectiveness of its deployment. In the tests, traffic data such as queue length and vehicle operating speeds were collected and analyzed to see whether motorists respond congestion related message on the changeable message sign when they did not perceive the congestion. By this approach, the motorists’ true responses to the system were identified. The results indicated that motorists did make positive responses to the messages provided by the system. However, it was found that the system may not be cost-effective because significant costs would be incurred in purchasing, installation and maintenance of the system. Recommendations were provided to utilize existing message signs and detectors to provide the same information to motorists as a queue detection system does.

The Impact of Rubbernecking on Urban Freeway Traffic  [PDF]
Jonathan Masinick, Hualiang Teng, Nesley Orochena
Journal of Transportation Technologies (JTTs) , 2014, DOI: 10.4236/jtts.2014.41012

An incident influences traffic not only in the incident direction but also in the opposite direction. There has been a research on the influence of incidents on the traffic in the incident direction. However, the research relating to the influence on the opposite direction of traffic is rare. In this study, the impact of incidents on the traffic in the opposite direction was investigated, focusing on identifying the factors that influence the likelihood and traffic delay of rubbernecking. In the investigation, a database consisting of incident information, traffic and other related variables was developed. For each incident in the database, it determined whether the impact of rubbernecking on the opposite direction traffic was significant. Factors that influenced the likelihood of rubbernecking were identified based on developing a binary logit model. Traffic delays in the opposite direction due to accidents were also calculated. A linear regression model was developed from which the influencing factors on traffic delay were identified. Based on the study on the likelihood of rubbernecking and the associated traffic delay, effective countermeasures were developed.

Matrices That Commute with Their Conjugate and Transpose  [PDF]
Geoffrey Goodson
Advances in Linear Algebra & Matrix Theory (ALAMT) , 2013, DOI: 10.4236/alamt.2013.33005

It is known that if A∈Mn is normal (AA*=A*A) , then AA ̄=A ̄A if and only if AAT=ATA. This leads to the question: do both AA ̄=A ̄A and AAT=ATA imply that A is normal? We give an example to show that this is false when n=4, but we show that it is true when n=2 and n=3.

Secured Efficient Fast Handover Multihoming Based NEMO+ (SEFMNEMO+) for Vanets  [PDF]
M. Siva Sangari, K. Baskaran
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.74023
Abstract: Vehicular Ad Hoc Network (VANET) is an emerging technology in which mobility management, continuous connectivity and security on data transmission between vehicles with high speed or during the change of topology of the network acts as a challenging exploration issue of Intelligent Transportation System (ITS) applications. This paper aims to formulate a ubiquitous connectivity to nodes by keeping the established connections before and after handover thereby minimizing the delay, packet loss and provide secured acknowledgement for handover. The Secured Efficient?Fast Handover Multihoming Based NEMO+ (SEFMNEMO+) framework helps to optimize the?NEMO+?scheme that supports multihomed network, handover and security. The predictive policy exchangemethod is used to update the future handover for minimizing the overhead delay and packet loss.?The multihomed feature in NEMO+ supports efficient handover mechanism between heterogeneous?networks when VANET connection fails. Public key cryptography provides the secure acknowledgement before handover i.e., the acknowledgement is encrypted with digital signature.
A Comprehensive Approach to WSN-Based ITS Applications: A Survey
Fernando Losilla,Antonio-Javier Garcia-Sanchez,Felipe Garcia-Sanchez,Joan Garcia-Haro,Zygmunt J. Haas
Sensors , 2011, DOI: 10.3390/s111110220
Abstract: In order to perform sensing tasks, most current Intelligent Transportation Systems (ITS) rely on expensive sensors, which offer only limited functionality. A more recent trend consists of using Wireless Sensor Networks (WSN) for such purpose, which reduces the required investment and enables the development of new collaborative and intelligent applications that further contribute to improve both driving safety and traffic efficiency. This paper surveys the application of WSNs to such ITS scenarios, tackling the main issues that may arise when developing these systems. The paper is divided into sections which address different matters including vehicle detection and classification as well as the selection of appropriate communication protocols, network architecture, topology and some important design parameters. In addition, in line with the multiplicity of different technologies that take part in ITS, it does not consider WSNs just as stand-alone systems, but also as key components of heterogeneous systems cooperating along with other technologies employed in vehicular scenarios.
Identificación del Cornezuelo (Claviceps purpurea (Fr.) Tul.) del Trigo (Triticum aestivum L.) en el Municipio de Nanacamilpa, Tlaxcala, México
Leyva-Mir, Santos Gerardo;Hernández-Bautista, Aurelio;Mariscal- Amaro, Luis Antonio;Villase?or-Mir, Héctor Eduardo;Huerta-Espino, Julio;
Revista mexicana de fitopatología , 2010,
Abstract: c. purpurea is the fungus causing the disease called "ergot of wheat" and can affect the yield until 40 %. in the region of nanacamilpa, tlaxcala, suspects the presence of c. purpurea; in addition, by the sclerotia size its believes that could be c. gigantea. some authors argue that for an early diagnosis and differentiation of these two pathogens, the sclerotia size at an early age is a distinctive feature. by extraction of dna and amplification of the its region (internal transcribed spacer), was proved that size is not a distinctive feature for the separation of these two pathogens, besides was observed that the fungus in the region may reach a greater early sclerotia size than average mentioned in the literature. finally it was confirmed the presence of c. purpurea in the town of nanacamilpa, tlaxcala.
Using ITS sequences to assess intraspecific genetic relationships among geographically separated collections of the myxomycete Didymium squamulosum
Winsett, Katherine E.;Stephenson, Steven L.;
Revista mexicana de micología , 2008,
Abstract: an analysis of its sequences of didymium squamulosum, a myxomycete regarded as cosmopolitan, shows variation among geographically separated isolates. its 1 and 2 and 5.8s rdna were amplified from specimens collected in widely scattered localities. the sequences were analyzed by parsimony analysis and the resulting trees show separate, moderate and well supported clades grouping some, but not all, of the geographic locations. its is the first molecular marker examined for intraspecific variation in myxomycetes, and although sequence analysis shows statistically significant differences among sequences from the 14 specimens considered, the heterogeneity in its 1 and its 2 appears to be too great for any more meaningful biogeographical conclusions. variation in the 5.8s and the amount of variation found in its 1 and 2 may signify that the isolates examined represent a complex of sibling species, although this particular marker cannot be used to make that distinction in this myxomycete.
Wireless Sensor Networks: A Solution for Smart Transportation
Rahat Ali Khan,Shakeel Ahmed Shah,Muhammad Abdul Aleem,Zulfiqar Ali Bhutto
Journal of Emerging Trends in Computing and Information Sciences , 2012,
Abstract: Wireless Sensor Networks recently have come into importance due to the fact that they have the prospective to revolutionize many segments of our financial system and life - from automation in shipping, environmental monitoring, transportation and healthcare industries.Transportation information collection and communication plays a key role in Intelligent Transportation System (ITS). Unfortunately, most conventional ITSs can only detect the vehicle in a fixed position, and their communication cables and power cables elevate the cost of construction and maintenance. Because of the advantages of the wireless sensor network (WSN) such as low power consumption, wireless distribution, and flexibility without cable restrictions., the usage of WSN in ITSs is expected to be able to overcome the above difficulties.Such networks are often deployed in resource-constrained environments, for instance with battery operated nodes running untethered. These constraints dictate that sensor network troubles are the best approached in a holistic manner, by jointly considering the physical, networking, and application layers and making major design trade-offs across the layers.
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