Search results for "Information Systems."

showing 10 items of 1545 documents

Stochastic dynamical modelling of spot freight rates

2014

Based on empirical analysis of the Capesize and Panamax indices, we propose different continuous-time stochastic processes to model their dynamics. The models go beyond the standard geometric Brownian motion, and incorporate observed effects like heavy-tailed returns, stochastic volatility and memory. In particular, we suggest stochastic dynamics based on exponential Levy processes with normal inverse Gaussian distributed logarithmic returns. The Barndorff-Nielsen and Shephard stochastic volatility model is shown to capture time-varying volatility in the data. Finally, continuous-time autoregressive processes provide a class of models sufficiently rich to incorporate short-term persistence …

Geometric Brownian motionStochastic volatilityStochastic processApplied MathematicsStrategy and ManagementManagement Science and Operations ResearchLévy processManagement Information SystemsExponential functionInverse Gaussian distributionsymbols.namesakeAutoregressive modelModeling and SimulationsymbolsStatistical physicsVolatility (finance)General Economics Econometrics and FinanceMathematicsIMA Journal of Management Mathematics
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Spatial analysis of the relationship between mortality from cardiovascular and cerebrovascular disease and drinking water hardness

2004

Journal Article; Research Support, Non-U.S. Gov't; Reproduced with permission from Environmental Health Perspectives. Previously published scientific papers have reported a negative correlation between drinking water hardness and cardiovascular mortality. Some ecologic and case-control studies suggest the protective effect of calcium and magnesium concentration in drinking water. In this article we present an analysis of this protective relationship in 538 municipalities of Comunidad Valenciana (Spain) from 1991-1998. We used the Spanish version of the Rapid Inquiry Facility (RIF) developed under the European Environment and Health Information System (EUROHEIS) research project. The strateg…

GerontologyMaleMini-Monograph: Information SystemsHealth Toxicology and MutagenesisWater supply:Named Groups::Persons::Age Groups::Adult::Middle Aged [Medical Subject Headings]Disease:Health Care::Environment and Public Health::Public Health::Sanitation::Sanitary Engineering::Water Supply [Medical Subject Headings]Magnesio:Organisms::Eukaryota::Animals::Chordata::Vertebrates::Mammals::Primates::Haplorhini::Catarrhini::Hominidae::Humans [Medical Subject Headings]PreescolarMediana EdadReference ValuesExposición a Riesgos AmbientalesMedicineCluster AnalysisMagnesiumMasculinoChildEnfermedades Cardiovascularesgeographic information systems:Named Groups::Persons::Age Groups::Child::Child Preschool [Medical Subject Headings]:Analytical Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Weights and Measures::Reference Values [Medical Subject Headings]AdultoAguaEpidemiologic SurveillanceEnvironmental exposureMiddle AgedHumanos:Health Care::Environment and Public Health::Public Health::Environmental Pollution::Environmental Exposure [Medical Subject Headings]Abastecimiento de aguarelative risk:Information Science::Information Science::Information Storage and Retrieval::Databases as Topic::Databases Factual::Geographic Information Systems [Medical Subject Headings]Cardiovascular DiseasesNiñoChild Preschool:Diseases::Nervous System Diseases::Central Nervous System Diseases::Brain Diseases::Cerebrovascular Disorders [Medical Subject Headings]Female:Named Groups::Persons::Age Groups::Infant [Medical Subject Headings]Risk assessmentAdulthierarchical spatial modelsAdolescentAncianoSistemas de Información Geográfica:Check Tags::Male [Medical Subject Headings]:Analytical Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Statistics as Topic::Cluster Analysis [Medical Subject Headings]:Named Groups::Persons::Age Groups::Infant::Infant Newborn [Medical Subject Headings]Risk AssessmentCalcioWater Supply:Chemicals and Drugs::Inorganic Chemicals::Metals::Metals Alkaline Earth::Calcium [Medical Subject Headings]Environmental health:Named Groups::Persons::Age Groups::Adult [Medical Subject Headings]:Chemicals and Drugs::Inorganic Chemicals::Metals::Metals Light::Magnesium [Medical Subject Headings]Humans:Chemicals and Drugs::Inorganic Chemicals::Hydroxides::Water [Medical Subject Headings]:Named Groups::Persons::Age Groups::Adult::Aged [Medical Subject Headings]:Diseases::Cardiovascular Diseases [Medical Subject Headings]Socioeconomic status:Named Groups::Persons::Age Groups::Child [Medical Subject Headings]Agedbusiness.industry:Analytical Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Statistics as Topic::Probability::Risk::Risk Assessment [Medical Subject Headings]Public Health Environmental and Occupational HealthInfant NewbornInfantWaterLactanteEnvironmental ExposureValores de ReferenciaAnálisis por ConglomeradosEstudios Epidemiológicosenvironmental epidemiologyCerebrovascular DisordersEpidemiologic StudiesTrastornos Cerebrovasculares:Check Tags::Female [Medical Subject Headings]Relative riskspatial smoothingCalciumbusinessMedición de Riesgo:Analytical Diagnostic and Therapeutic Techniques and Equipment::Investigative Techniques::Epidemiologic Methods::Epidemiologic Study Characteristics as Topic::Epidemiologic Studies [Medical Subject Headings]Environmental epidemiology
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Gesture recognition using low-cost devices: Techniques, applications, perspectives

2016

Negli ultimi anni abbiamo assistito ad una grande diffusione dei cosiddetti “Kinect-like devices”, ovvero dispositivi basati su un insieme di sensori a basso costo, che consentono di ottenere un’immagine di profondità della scena ripresa. L’alta accessibilità di questi dispositivi, principalmente in termini di costi, ne ha facilitato la diffusione nell’ambito del riconoscimento dei gesti in numerose applicazioni, sia commerciali che di ricerca. In questo articolo saranno inizialmente illustrati i principi generali su cui si fondano le principali tecniche utilizzate per riconoscere i gesti, sfruttando i dati ottenibili dai dispositivi “Kinect-like”. Successivamente, saranno presentati alcuni…

Gesture recognitionSettore ING-INF/05 - Sistemi Di Elaborazione Delle InformazioniTouchless interactionComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISIONMedia TechnologyKinect-like devicesComputer Science Applications1707 Computer Vision and Pattern RecognitionInformation SystemInformation Systems; Computer Science Applications1707 Computer Vision and Pattern Recognition; Media TechnologyHuman-computer interactionInformation Systems
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SYSTEMS DECOMPOSITION AND COUPLING

1993

In order to handle efficiently complex models of real systems, it is a convenient practice to decompose them into subsystems that are validated independently. The next step would be joining the subsystems into a global system and performing a new global validation. A formalization of this process is performed as a consequence of practical experience with a model generator expert system based on general systems theory.

Global systemReal systemsComputer scienceProcess (engineering)Control engineeringcomputer.software_genreExpert systemCoupling (computer programming)Systems theoryArtificial IntelligencecomputerAlgorithmSoftwareInformation SystemsGenerator (mathematics)Cybernetics and Systems
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Simulation of the anomalous social behaviours with a learning model

2010

In this paper our objective is to understand the process of emergence in the study of social behaviours evolution with a learning model. When the system is too complex to study it is important to recreate an artificial universe in which experiments’ simulation can help to understand the mechanisms of human social behaviours. In Previous work we determined the conditions that favour the perpetuity of the Capitalist Globalization, the possibility of its overcoming with a Free Scientific Society and the possibility of the Ecological Hecatomb. In this paper we have theoretically explained the emergence of the anomalous behaviours and developed statistical studies of the conditions that favour t…

GlobalizationInformation Systems and ManagementProcess (engineering)Strategy and ManagementSocial changeGeneral Social SciencesPerpetuitySociologyScientific societyEpistemologySystems Research and Behavioral Science
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SIMULATING DEMOGRAPHY AND HUMAN DEVELOPMENT DYNAMICS

2014

[EN] A deterministic/stochastic model in which the demographic and the well-being subsystems of a country are involved and related is presented as a way to approach human development. The demographic subsystem is a side-by-side, single-gender, age-structured population dynamic model. The well-being subsystem states the dynamics of the United Nations Hybrid Human Development Index. The model has been validated in the case of Spain and Belgium. Some simulations have been performed with the model for the case of Spain in the 2009-2020 period to determine strategies and scenarios that could increase the life expectancy at birth per gender. Copyright © 2014 Taylor & Francis Group, LLC.

Governanceeducation.field_of_studyPopulation statisticsStochastic modellingPopulationHybrid Human Development IndexComputer simulationPopulation statisticsDeterministic modelsHuman development (humanity)Human population dynamicsStochastic modelsStochastic modelGeographyArtificial IntelligenceLife expectancyHuman Development IndexMATEMATICA APLICADAeducationHuman population dynamicsSimulationSoftwareInformation SystemsDemographyCybernetics and Systems
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Social Media as Public Sphere: A Stakeholder Perspective

2016

Purpose This paper aims to examine major stakeholders’ communication preferences in eParticipation initiatives and discuss how this affects the public sphere. Despite the potential of social media, it has proven difficult to get people actively involved in the decision-making processes. There is a need for more research on how stakeholders manage and use social media to communicate. Design/methodology/approach The study was conducted as a qualitative case study. Data sources include interviews, social media content, document analysis and field notes. Findings Communication preferences of stakeholders vary according to their salience level. Stakeholders with higher salience are less likely …

GovernmentInformation Systems and ManagementPublic AdministrationSalience (language)business.industry05 social sciencesStakeholderMedia relationsPublic relations0506 political scienceComputer Science ApplicationsPower (social and political)050602 political science & public administrationPublic sphereSocial mediaSociology0509 other social sciences050904 information & library sciencesbusinessStakeholder theory
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Simulation models in eGovernment using system dynamics: A literature survey

2016

System Dynamics (SD) is a method to build simulation models using computers, to study the behaviour of systems, and apply what-if scenarios aiming at achieving optimal policy design. To have an overview of the current state-of-the-art of SD use in the eGovernment field; we have surveyed related literature. Our main goal is to uncover the possibilities for future research by clarifying the shortages. The identified literature is not very large. In most of the literature, SD models use was limited to SD practitioners. We discovered low usage of Group Model Building and workshops despite their usefulness in involving non-SD practitioners in the model building process. Additionally, there is a …

GovernmentKnowledge managementbusiness.industryComputer science05 social sciencesSimulation modeling02 engineering and technologyGroup modelField (computer science)System dynamics020204 information systems0502 economics and business0202 electrical engineering electronic engineering information engineeringSpiteScenario testingLiterature surveybusiness050203 business & management2016 IST-Africa Week Conference
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Affordances and effects of introducing social media within eParticipation-Findings from government-initiated Indonesian project

2018

Governmentbusiness.industry05 social sciences02 engineering and technologyPublic relationslanguage.human_languageIndonesian020204 information systems0502 economics and business0202 electrical engineering electronic engineering information engineeringlanguageSocial mediaSociologybusinessEmerging marketsAffordance050203 business & managementInformation SystemsThe Electronic Journal of Information Systems in Developing Countries
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The Current State of Social Media Research for eParticipation in Developing Countries: A Literature Review

2016

While there is an increasing interest for conducting research on the importance of social media within the eParticipation area, more emphasis is still needed within the context of developing countries. We address this need by presenting a literature review on social media within eParticipation in developing countries, to add to the understanding of how these technologies influence the political environment. We discuss trends, contributions and challenges within this area, and propose a future research agenda. Furthermore, we propose a model of social media for eParticipation from a process view perspective to guide future research in this field.

Governmente-participationbusiness.industry05 social sciencesDeveloping countryContext (language use)02 engineering and technologyPublic relations0506 political sciencePolitics020204 information systemsCultural diversityPolitical science050602 political science & public administration0202 electrical engineering electronic engineering information engineeringThe InternetSocial mediabusiness2016 49th Hawaii International Conference on System Sciences (HICSS)
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