Search results for "internet"

showing 10 items of 2589 documents

Examination of robust D-stability of TCP-DCR protocol

2012

This paper presents non-linear mathematical model of a computer network with a part of wireless network. The article contains an analysis of the stability of the network based on TCP-DCR, which is a modification of the traditional TCP. Block diagram of the network model was converted to a form in order to investigate the D-stability using the method of the space of uncertain parameters. Robust D-stability is calculated for constant delays values.

CUBIC TCPD-stabilityTCP accelerationWireless networkComputer scienceReal-time computingTCP tuningBlock diagramTopologyStability (probability)Computer Science::Networking and Internet Architecturecomputer networksTCP-DCR protocolBIC TCPNetwork modelTheoretical and Applied Informatics
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TCP Performance in Mobile Ad hoc Networks

2013

International audience; In this paper, we present a survey of TCP (Transmission Control Protocol) protocol for better performance in the MANET (Mobile Ad Hoc Network). After a short presentation of the main features of TCP, we give the most important problems from which TCP suffer in MANET. We present after that some approaches proposed in the literature in order to improve its performance. Our paper contains also a performance evaluation of TCP NewReno and TCP Vegas transport protocols under AODV and DSR routing protocols. The simulations are conducted under varying conditions of number of TCP connections, number of nodes and mobility.

CUBIC TCPTCP accelerationComputer scienceTCP tuning050801 communication & media studies02 engineering and technologyTCP Friendly Rate ControlTCP Westwood[INFO.INFO-NI]Computer Science [cs]/Networking and Internet Architecture [cs.NI]0508 media and communications0202 electrical engineering electronic engineering information engineeringZeta-TCPMobile Ad hoc NetworksProblems of TCP in MANETTCP Protocolbusiness.industry05 social sciencesComputerSystemsOrganization_COMPUTER-COMMUNICATIONNETWORKSImproving of TCP in MANET020206 networking & telecommunicationsINGENIERIA TELEMATICATCP VegasTCP global synchronizationPerformance evaluationTCP NewRenoCompound TCPbusinessComputer network
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Regulating Internet Trade in CITES Species

2013

International trade in species that are or may be endangered by collection from the wild is regulated under the Convention on International Trade in Endangered Species of wild fauna and flora (CITES) for 176 member States (Parties). Internet commerce is a relatively new route for such trade. In 2007, the CITES Secretariat asked Parties to collect information on internet wildlife trade and report problems and implemented regulations. The reports indicated it was difficult to even approximate the influence of e-commerce on CITES-listed species (CITES Secretariat 2009). We report a case study in which we quantified international transactions over an internet auction site of CITES-listed cacti …

CactaceaeSettore BIO/07 - EcologiaConservation of Natural ResourcesInternationalityInternational tradeBiologyConference of the partiesmedia_common.cataloged_instanceEuropean unionTreatyEcology Evolution Behavior and SystematicsNature and Landscape Conservationmedia_commonInternetDiversityEcologyCITESEcologybusiness.industryEndangered SpeciesCommerceRange stateCITES Internet trade international Cactaceae cactiEnvironmental PolicyWildlife tradeSettore BIO/03 - Botanica Ambientale E ApplicataListing (finance)businessDatabase transaction
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Radiation Therapy in Palestine: Not Only Money, But Also Real Accessibility

2017

Cancer ResearchRadiationbusiness.industrymedicine.medical_treatmentInternet privacyRadiation therapy03 medical and health sciences0302 clinical medicineOncology030220 oncology & carcinogenesismedicineRadiology Nuclear Medicine and imaging030212 general & internal medicinePalestinebusinessInternational Journal of Radiation Oncology*Biology*Physics
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On the spectral moments of non-WSSUS mobile-to mobile double-Rayleigh fading channels

2017

This paper deals with the mathematical analysis of the spectral moments of non-wide-sensestationary uncorrelated-scattering (non-WSSUS) mobile-to-mobile (M2M) double-Rayleigh fading channels. The point of departure is a recently proposed geometry-based statistical model (GBSM) for M2M double-Rayleigh fading channels from which general analytical expressions are derived for the average Doppler shift, Doppler spread, average delay, and delay spread. Closed-form solutions of such expressions are presented for the particular case of the geometrical two-rings scattering model. The obtained results indicate that the average Doppler shift and Doppler spread are directly influenced by not only the …

Carrier signalComputer scienceScatteringBandwidth (signal processing)020206 networking & telecommunications020302 automobile design & engineering02 engineering and technologyCommunications systemDelay spreadsymbols.namesake0203 mechanical engineeringComputer Science::Networking and Internet Architecture0202 electrical engineering electronic engineering information engineeringsymbolsFadingStatistical physicsDoppler effectComputer Science::Information TheoryRayleigh fadingCommunication channel2017 IEEE 28th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)
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Consumer attitude toward using smart shopping carts: a comparative analysis of Italian and Croatian consumer attitudes

2016

This paper aims to explore consumer attitudes toward using smart shopping cart, considering country of origin, gender, age, and intentions to use smart shopping carts while purchasing. Moreover, it investigates the influence of extracted factors on consumers' attitudes toward using smart shopping carts and the users' levels of digital competence. The data was collected through survey questionnaires using a purposive sample of 313 Croatian and Italian respondents. To this end, we applied statistical methodologies such as binary logistic regression, factor analysis, and analysis of variance. We found that, compared with Croatians, Italian respondents have a more positive attitude toward using…

CartInternet retailing; smart shopping carts; functional factors; convenience factors; Croatia; Italy; consumer attitudes; country of origin; gender; age; purchase intentions; digital competence; smart carts.CroatiaSample (statistics)Logistic regressionManagement Information Systems0502 economics and businessBusiness and International ManagementMarketingconvenient factorDigital competenceMarketing05 social sciencesPurchasing processsmart shopping cartAdvertisinginternet retailing; smart shopping cart; functional factors; convenient factors; CroatiaPurchasingCountry of originfunctional factorInformation and Communications Technology050211 marketinginternet retailingBusinessInternet retailing; smart shopping carts; functional factors; convenience factors; Croatia; Italy; consumer attitudes; country of origin; gender; age; purchase intentions; digital competence; smart cartsSettore SECS-P/08 - Economia E Gestione Delle Imprese050203 business & management
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Wykorzystanie modelu PESO do pomiaru poziomu ekspozycji i zaangażowania w prowadzonych w mediach społecznościowych działaniach promocyjnych pośrednik…

2019

The growing popularity of social media is accompanied by an increase in the importance of the quality and frequency of content published in the Internet. This entails constant analysis, among others, in the field of exposure and the involvement of Internet users in the media. Among the many available tools to carry out the above analysis, in this work the PESO model – Don Bartholomew was used. The aim of the paper is to implement the PESO model (measuring social media on many levels) on the real estate market and to analyze the level of exposure and social media involvement by real estate agents. The detailed objective is to analyze the information content of social media publications, vide…

Case methodRankingbusiness.industryScale (social sciences)media_common.quotation_subjectThe InternetAdvertisingSocial mediaQuality (business)Real estatebusinessPopularitymedia_commonNierówności społeczne a wzrost gospodarczy
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Electrophoresis of Unlabeled Proteins in a Sequencing Gel Apparatus

2000

Cell ExtractsGel electrophoresisInternetChemistryGel electrophoresis of proteinsGeneral Biochemistry Genetics and Molecular BiologyNeoplasm ProteinsElectrophoresisBiochemistryTumor Cells CulturedHumansSeparation methodElectrophoresis Polyacrylamide GelTemperature gradient gel electrophoresisBiotechnologyBioTechniques
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On the statistical properties of the capacity of double Hoyt fading channels

2010

The statistical properties of the capacity of narrowband double Hoyt fading channels are studied. Toward this end, analytical expressions for the probability density function (PDF) and cumulative distribution function (CDF) of the instantaneous channel capacity process are derived. Furthermore, for the characterization of the dynamical behavior of the time-varying channel capacity, expressions are provided for the level-crossing rate (LCR) and the average duration of fades (ADF). Since the double Rayleigh fading channel is a special case of the double Hoyt model, it is shown that the derived expressions can be reduced to the corresponding results already known for the capacity of the double…

Channel capacityFading distributionNarrowbandChannel state informationCumulative distribution functionMIMOComputer Science::Networking and Internet ArchitectureElectronic engineeringFadingStatistical physicsComputer Science::Information TheoryRayleigh fadingMathematics2010 IEEE 11th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)
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A Trajectory-Driven 3D Channel Model for Human Activity Recognition

2021

This paper concerns the design, analysis, and simulation of a 3D non-stationary channel model fed with inertial measurement unit (IMU) data. The work in this paper provides a framework for simulating the micro-Doppler signatures of indoor channels for human activity recognition by using radiofrequency-based sensing technologies. The major human body segments, such as wrists, ankles, torso, and head, are modelled as a cluster of moving point scatterers. We provide expressions for the time variant (TV) speed and TV angles of motion based on 3D trajectories of the moving person. Moreover, we present mathematical expressions for the TV Doppler shifts and TV path gains associated with each movin…

Channel transfer functionGeneral Computer ScienceComputer scienceInternet of ThingsComputació centrada en humansDoppler EfecteActivity recognitionsymbols.namesakespectrogramInertial measurement unitVDP::Teknologi: 500::Medisinsk teknologi: 620Channel measurementsnon-stationary fading channelsmedicineGeneral Materials ScienceComputer visionNon-stationary fading channelsReconeixement de formes (Informàtica)channel state informationSpectrogrambusiness.industryWireless sensingGeneral Engineering:Enginyeria de la telecomunicació::Processament del senyal::Reconeixement de formes [Àrees temàtiques de la UPC]TorsoInertial measurement unitsExpression (mathematics)TK1-9971Time-variant Doppler power characteristicsmedicine.anatomical_structureChannel state informationHuman-centered computingchannel transfer functiontime-variant Doppler power characteristicsTrajectorysymbolsChannel state informationSpectrogramMicro-Doppler signature:Informàtica::Intel·ligència artificial [Àrees temàtiques de la UPC]Electrical engineering. Electronics. Nuclear engineeringArtificial intelligenceHuman activity recognitionbusinessDoppler effect
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