Search results for "Cellular telephone"

showing 4 items of 4 documents

Visually Perceived Distance Judgments: Tablet-Based Augmented Reality Versus the Real World

2016

Does visually perceived distance differ when objects are viewed in augmented reality (AR), as opposed to the real world? What are the differences? These questions are theoretically interesting, and the answers are important for the development of many tablet- and phone-based AR applications, including mobile AR navigation systems. This article presents a thorough literature review of distance judgment experimental protocols, and results from several areas of perceptual psychology. In addition to distance judgments of real and virtual objects, this section also discusses previous work in measuring the geometry of virtual picture space and considers how this work might be relevant to tablet A…

Computer scienceHuman Factors and Ergonomics02 engineering and technologySpace (commercial competition)050105 experimental psychologyField (computer science)0202 electrical engineering electronic engineering information engineeringAR application0501 psychology and cognitive sciencesPerceptual psychologyComputer visiondistance perceptionta113experimental protocolstablet-based augmented realitybusiness.industrybisection05 social sciencesnavigation systems020207 software engineeringaugmented realityComputer Science ApplicationsHuman-Computer Interactioncellular telephone systemsAugmented realityArtificial intelligencebusinessInternational Journal of Human–Computer Interaction
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Recovery Capabilities of Rateless Codes on Simulated Turbulent Terrestrial Free Space Optics Channel Model

2013

Free Space Optics (FSO) links are affected by several impairments: optical turbulence, scattering, absorption, and pointing. In particular, atmospheric optical turbulence generates optical power fluctuations at the receiver that can degrade communications with fading events, especially in high data rate links. Innovative solutions require an improvement of FSO link performances, together with testing models and appropriate channel codes. In this paper, we describe a high-resolution time-correlated channel model able to predict random temporal fluctuations of optical signal irradiance caused by optical turbulence. Concerning the same channel, we also report simulation results on the error mi…

EngineeringArticle SubjectIrradianceOptical powerSettore ING-INF/01 - ElettronicaSignaloptical turbulenceElectronic engineeringFadingElectrical and Electronic Engineeringtime-serieComputer Science::Information TheorySettore ING-INF/03 - TelecomunicazioniTurbulenceScatteringbusiness.industryRateless codesSettore ING-INF/02 - Campi Elettromagneticilcsh:HE9713-9715Free Space Opticlcsh:Cellular telephone services industry. Wireless telephone industrylcsh:Electrical engineering. Electronics. Nuclear engineeringbusinesslcsh:TK1-9971Communication channelFree-space optical communicationInternational Journal of Antennas and Propagation
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Nonparticipation Selection Bias in the MOBI-Kids Study.

2018

Supplemental Digital Content is available in the text.

GerontologyMaleAdolescentCellular telephone useEpidemiologyCase–control studymedia_common.quotation_subjectEpidemiologic methodsAdolescents01 natural sciencesBrain tumorsBrain cancer010104 statistics & probability03 medical and health sciencesYoung Adult0302 clinical medicineElectromagnetic FieldsAge groupsBiasJapanRisk FactorsGermanySurveys and QuestionnairesPerinatal and Child HealthOdds RatioHumans030212 general & internal medicine0101 mathematicsIsraelChildChildrenmedia_commonSelection biasSelection biasBrain NeoplasmsCase-control studyItalySpainCase-Control StudiesComputingMethodologies_DOCUMENTANDTEXTPROCESSINGFemaleFrancePsychologyCell PhoneEpidemiology (Cambridge, Mass.)
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Assessment of radiofrequency exposure from cellular telephone daily use in an epidemiological study: German Validation study of the international cas…

2004

The objective of the study is to validate self-reported cellular phone use information by comparing it with the cumulative emitted power and duration of calls measured by software-modified cellular phones (SMP). The information was obtained using a questionnaire developed for the international case-control study on the risk of the use of mobile phones in tumours of the brain or salivary gland (INTERPHONE-study).The study was conducted in Bielefeld, Germany. Volunteers were asked to use SMPs instead of their own cellular phones for a period of 1 month. The SMP recorded the power emitted by the mobile phone handset during each base station contact. Information on cellular phone use for the sa…

MaleEngineeringmedicine.medical_specialtyValidation studyTime FactorsEpidemiologyRadio WavesToxicologyGermanAutomationGermanySurveys and QuestionnairesEpidemiologymedicineHumansExposure assessmentbusiness.industryData CollectionPublic Health Environmental and Occupational HealthCase-control studyReproducibility of ResultsConfounding Factors EpidemiologicEnvironmental exposureEnvironmental ExposurePollutionlanguage.human_languageCellular telephoneCase-Control StudiesEmergency medicinelanguageFemalebusinessTelecommunicationsCell PhoneSoftwareJournal of exposure analysis and environmental epidemiology
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