Search results for "Wire"

showing 10 items of 1383 documents

Handover management in heterogenous mobile and wireless networks

2015

Since 1990, networking and mobile technologies have made a phenomenal unprecedented progress. This progress has been experienced on multiple fronts in parallel; especially on the application level and the user's needs one. This rapid evolution of the technology imposed a need for the existence of heterogeneous environments where the coverage is ensured throughout the different available networks. The challenge with such architecture would be to provide the user with the ability to navigate through the different available networks in a transparent and seamless fashion. However, the navigation among different types of networks is commonly referred to as vertical Handover. The IEEE 802.21 stan…

HandoverMedia Independent Handover (MIH)Logique floue[INFO.INFO-NI] Computer Science [cs]/Networking and Internet Architecture [cs.NI]Wireless communicationEnvironnement hétérogèneFuzzy logicMobile networksHeterogeneous environmentsMobile protocolsRéseau mobileLinear regressionRéseau sans filRégression linéaireProtocoles mobiles
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Optimized Handover Algorithm Based on Stackelberg Games in CBTC Systems for Urban Rail Transit

2014

Communications Based Train Control (CBTC) systems have become indispensable for train operation to improve the safety and efficiency of train running to the utmost extent at present. In this paper, the problem of train handover in wireless LAN of CBTC systems for urban rail transit was taken into consideration, which was formulated as a market competition with Stackelberg games and cooperative diversity to obtain the reasonable resource allocation for trains. Under the environment of continuous train-to-wayside communications with high reliability, the successful train handover probability was analyzed in detail. Firstly, the relay triggering during handover was introduced, and the price st…

HandoverUrban Rail Transitlcsh:TA1-2040ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSlcsh:Technology (General)Communications Based Train Control (CBTC)lcsh:T1-995Wireless LANStackelberg Gamelcsh:Engineering (General). Civil engineering (General)Journal of Engineering Science and Technology Review
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Smoking cessation opportunities in severe mental illness (tobacco intensive motivational and estimate risk — TIMER—): study protocol for a randomized…

2019

There is an increased risk of premature death in people with severe mental illness (SMI). Respiratory disorders and cardiovascular disease are leading causes of increased mortality rates in these patients, and tobacco consumption remains the most preventable risk factor involved. Developing new tools to motivate patients towards cessation of smoking is a high priority. Information on the motivational value of giving the lung age and prevention opportunities is unknown in this high-risk population. In the context of community care, screening and early detection of lung damage could potentially be used, together with mobile technology, in order to produce a prevention message, which may provi…

Health Knowledge Attitudes PracticeBipolar DisorderTime FactorsWireless technology:Phenomena and Processes::Physical Phenomena::Time::Time Factors [Medical Subject Headings]medicine.medical_treatmentHealth Behavior:Psychiatry and Psychology::Mental Disorders::Mood Disorders::Affective Disorders Psychotic::Bipolar Disorder [Medical Subject Headings]:Psychiatry and Psychology::Behavior and Behavior Mechanisms::Behavior::Tobacco Use::Smoking [Medical Subject Headings]Medicine (miscellaneous)EsquizofreniaSmoking PreventionSeverity of Illness Indexlaw.invention:Organisms::Eukaryota::Animals::Chordata::Vertebrates::Mammals::Primates::Haplorhini::Catarrhini::Hominidae::Humans [Medical Subject Headings]Tecnología inalámbricaStudy ProtocolPulmonary Disease Chronic Obstructive0302 clinical medicineRandomized controlled triallawEnfermedad pulmonar obstructiva crónicaMulticenter Studies as TopicPharmacology (medical)Prospective Studies030212 general & internal medicineProspective cohort studyLungRandomized Controlled Trials as Topic:Psychiatry and Psychology::Behavioral Disciplines and Activities::Schizophrenic Psychology [Medical Subject Headings]lcsh:R5-920:Analytical Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Evaluation Studies as Topic::Clinical Trials as Topic::Controlled Clinical Trials as Topic::Randomized Controlled Trials as Topic [Medical Subject Headings]COPDeducation.field_of_study:Psychiatry and Psychology::Behavior and Behavior Mechanisms::Behavior::Health Behavior [Medical Subject Headings]Chronic obstructive pulmonary diseaseSmokingTrastorno bipolar:Anthropology Education Sociology and Social Phenomena::Education::Education Nonprofessional::Health Education::Patient Education as Topic [Medical Subject Headings]Cese del uso del tabacoTobacco cessation:Analytical Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Data Collection::Health Surveys::Health Status Indicators::Patient Acuity::Severity of Illness Index [Medical Subject Headings]Treatment OutcomeScreeningSchizophrenic Psychologylcsh:Medicine (General)medicine.medical_specialty:Analytical Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Epidemiologic Study Characteristics as Topic::Epidemiologic Studies::Cohort Studies::Longitudinal Studies::Prospective Studies [Medical Subject Headings]Bipolar disorderPopulationContext (language use)03 medical and health sciencesPatient Education as Topic:Information Science::Information Science::Communications Media::Telecommunications::Telephone::Cellular Phone::Text Messaging [Medical Subject Headings]Mobile technologySeverity of illness:Psychiatry and Psychology::Mental Disorders::Schizophrenia and Disorders with Psychotic Features::Schizophrenia [Medical Subject Headings]medicine:Diseases::Respiratory Tract Diseases::Lung Diseases::Lung Diseases Obstructive::Pulmonary Disease Chronic Obstructive [Medical Subject Headings]HumansRisk factoreducation:Analytical Diagnostic and Therapeutic Techniques and Equipment::Diagnosis::Prognosis::Treatment Outcome [Medical Subject Headings]:Geographical Locations::Geographic Locations::Europe::Spain [Medical Subject Headings]MotivationText Messagingbusiness.industry:Anatomy::Respiratory System::Lung [Medical Subject Headings]:Psychiatry and Psychology::Behavior and Behavior Mechanisms::Motivation [Medical Subject Headings]medicine.disease:Analytical Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Evaluation Studies as Topic::Clinical Trials as Topic::Multicenter Studies as Topic [Medical Subject Headings]SpainEmergency medicineSchizophreniaSmoking cessation:Psychiatry and Psychology::Behavior and Behavior Mechanisms::Behavior::Tobacco Use::Tobacco Use Cessation::Smoking Cessation [Medical Subject Headings]Smoking Cessationbusiness030217 neurology & neurosurgeryTrials
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Novel Wireless Sensor System for Dynamic Characterization of Borehole Heat Exchangers

2011

The design and field test of a novel sensor system based in autonomous wireless sensors to measure the temperature of the heat transfer fluid along a borehole heat exchanger (BHE) is presented. The system, by means of two specials valves, inserts and extracts miniaturized wireless sensors inside the pipes of the borehole, which are carried by the thermal fluid. Each sensor is embedded in a small sphere of just 25 mm diameter and 8 gr weight, containing a transceiver, a microcontroller, a temperature sensor and a power supply. A wireless data processing unit transmits to the sensors the acquisition configuration before the measurements, and also downloads the temperature data measured by the…

Heat pumpsEngineeringGeography & travelBoreholeMechanical engineeringlcsh:Chemical technologyBiochemistryGeothermal energyArticleAnalytical ChemistryWireless sensorsHeat exchangerThermalWirelesslcsh:TP1-1185Thermal analysisElectrical and Electronic EngineeringThermal analysisInstrumentationddc:910business.industryheat pumps; geothermal energy; thermal analysis; wireless sensorsAtomic and Molecular Physics and OpticsMicrocontrollerThermal response testMAQUINAS Y MOTORES TERMICOSTransceiverbusiness
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Adaptive Collision Avoidance through Implicit Acknowledgments in WSNs

2008

The large number of nodes, typical of many sensor network deployments, and the well-known hidden terminal problem make collision avoidance an essential goal for the actual employment of WSN technology. Collision avoidance is traditionally dealt with at the MAC Layer and plenty of different solutions have been proposed, which however have encountered limited diffusion because of their incompatibility with commonly available devices.In this paper we propose an approach to collision avoidance which is designed to work over a standard MAC Layer, namely the IEEE 802.15.4 MAC, and is based on application-controlled delays of packet transmission times. The proposed scheme is simple, decentralized …

Hidden node problemComputer sciencebusiness.industryComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSSynchronizationTree (data structure)ScalabilityMultiple Access with Collision Avoidance for WirelessWireless Sensor NetworksbusinessWireless sensor networkCollision avoidanceCarrier sense multiple access with collision avoidanceComputer network2008 IEEE Asia-Pacific Services Computing Conference
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Cooperative RTS/CTS MAC with relay selection in distributed wireless networks

2009

This paper proposes a cooperative multiple access protocol based on the Distributed Coordination Function (DCF) Request-To-Send/Clear-To-Send (RTS/CTS) scheme for distributed wireless networks. It answers three key questions concerning cooperation from the network perspective, namely when to cooperate, whom to cooperate with and how to protect cooperative transmissions. According to our protocol, the cooperation is initiated only if the direct transmission fails. An optimal relay node is selected in a distributed manner according to instantaneous relay channel conditions without prior information or extra signaling among relay candidates in the network. An additional three-way handshake is …

Hidden node problemComputer sciencebusiness.industryWireless networkNode (networking)ComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSDistributed coordination functionlaw.inventionCooperative diversityRelaylawMultiple Access with Collision Avoidance for WirelessbusinessRelay channelComputer network2009 International Conference on Ultra Modern Telecommunications & Workshops
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Revisit of RTS/CTS Exchange in High-Speed IEEE 802.11 Networks

2005

IEEE 802.11 medium access control (MAC), called distributed coordination function (DCF), provides two different access modes, namely, 2-way (basic access) and 4-way (RTS/CTS) handshaking. The 4-way handshaking has been introduced in order to combat the hidden terminal phenomenon. It has been also proved that such a mechanism can be beneficial even in the absence of hidden terminals, because of the collision time reduction. We analyze the effectiveness of the RTS/CTS access mode, in current 802.11b and 802.11a networks. Since the rates employed for control frame transmissions can be much lower than the rate employed for data frames, the assumption on the basis of the 4-way handshaking introd…

Hidden node problembusiness.industryComputer scienceReal-time computingFrame (networking)Wireless local area networks (WLAN)Distributed coordination functionThroughputbackoff algorithmHandshakingMedia access controlMultiple Access with Collision Avoidance for WirelessIEEE 802.11e-2005businessCarrier sense multiple access with collision avoidanceComputer networkSixth IEEE International Symposium on a World of Wireless Mobile and Multimedia Networks
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A circularly polarized wideband high gain patch antenna for wireless power transfer

2018

This article deals with a microstrip patch antenna working at 868 MHz, suitable for the radio frequency wireless power transfer and energy harvesting applications. The proposed monolithic antenna is compact, lightweight and it is printed on a thick substrate in order to maximize the total gain in the broadside direction. The antenna radiates at 868 MHz with a fractional impedance bandwidth of 5% and it shows a gain of 4.14 dB.

High-gain antennaAtomic and Molecular Physics and OpticComputer science02 engineering and technologyCondensed Matter PhysicSettore ING-INF/01 - Elettronicawireless energy transferAtomic and Molecular PhysicsElectronic0202 electrical engineering electronic engineering information engineeringcapacitive compensation; enhanced gain antenna; radiofrequency energy harvesting; wireless energy transfer; Electronic Optical and Magnetic Materials; Atomic and Molecular Physics and Optics; Condensed Matter Physics; Electrical and Electronic EngineeringOptical and Magnetic MaterialsWireless power transferWidebandElectrical and Electronic EngineeringPatch antennabusiness.industryElectronic Optical and Magnetic Material020208 electrical & electronic engineeringElectrical engineering020206 networking & telecommunicationsradiofrequency energy harvestingCondensed Matter PhysicsAtomic and Molecular Physics and OpticsElectronic Optical and Magnetic Materialscapacitive compensationenhanced gain antennaand Opticsbusiness
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Comparison of effects on crustaceans: carbon nanoparticles and molybdenum compounds nanowires

2013

Carbon nanomaterials (CNM) and molybdenum compound nanostructures are materials with various applications yet little is known regarding the toxicity of these nanoparticles in pristine form in aquatic environment. Daphnia magna standard acute toxicity test (EN ISO 6341:1996; freshwater) and Artemia salina standard acute toxicity test (ArtoxKit standard method; 15 ppt saltwater) were applied to assess the toxicity of non-modified CNM and molybdenum compound nanowires in water. It has been observed that CNM are more toxic in freshwater suspensions and somewhat more toxic than the tested molybdenum compound nanowires.

HistoryMaterials sciencebiologyDaphnia magnaNanowireNanoparticlechemistry.chemical_elementNanotechnologybiology.organism_classificationCrustaceanAcute toxicityComputer Science ApplicationsEducationchemistryMolybdenumToxicityArtemia salinaNuclear chemistryJournal of Physics: Conference Series
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A distributed data storage and retrieval scheme in unattended WSNs using Homomorphic Encryption and secret sharing

2009

Many data storage schemes have been proposed in the past for keeping dependable data storage, but they are not designed for Unattended Wireless Sensor Networks (UWSNs). When applying these schemes to UWSNs, most of them have limitations such as high storage requirement, transmission cost, and not resilient to a large number of node compromises. To address the problem of data storage, transmission cost, and resilience of node compromise in UWSNs, we propose a novel Homomorphic Encryption and Homomorphic Secret Sharing based scheme (HEHSS) to accomplish the goals of confidentiality, resilience to node compromises, reliability, and efficiency of storage and transmission. Our scheme exploits th…

Homomorphic secret sharingbusiness.industryComputer scienceNode (networking)Distributed data storeHomomorphic encryptionCryptographybusinessEncryptionSecret sharingWireless sensor networkComputer network2009 2nd IFIP Wireless Days (WD)
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