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In this paper we introduce an influenza surveillance and forecast system that can track the proliferation of influenza and predict potential infections by analyzing smartphone sensor readings. While previous studies focus on the social connectivity to deduce proliferation paths, we investigate physical contacts and their surrounding features including the staying time of these contacts, the human...
The recent proliferation of satellite imaging technologies and advancements of internet infrastructure have encouraged provisions of satellite image services in web environments. However, most of these services still rely upon low-resolution satellite images combined with DEM. In this paper, we propose the adaptive rendering engine which renders high-spatial resolution satellite images for proficient...
Recently, smart spaces are being created using RFID or USN technologies in ubiquitous computing environments, and the number of researches and applications related with context-aware systems, which process sensed data collected from numerous sensors and provide automated services properly according to situations, are ever increasing. There are also sharp increase in demands and needs for location-based...
Program codes running on the sensor nodes need to be updated from time to time to fix bugs, tune the parameters, insert new functions, or delete useless codes. In this paper, we propose a policy-based reprogramming framework that can optimize the reprogramming process based on the execution characteristics of modules that constitute the WSN applications. To accomplish this we model the characteristics...
With the rapid development of Web Service technology, the number of Web Service providers having the same Web Services are increasing. As a result, the QoS elements become more important factors for Web Service finding. But, most of previous research efforts do not consider various QoS elements including Service-specific QoS elements during service finding. In this paper, we propose a Web Service...
With the diffusion of ubiquitous technologies, many city facilities that are closely related with our daily life are being combined with IT technologies. As a result, various IT services running on the separate network are also being integrated into a city-based service. However, serious problems can occur in terms of the stability and reliability of the u-City (ubiquitous city) service, if the security...
As ITS technology evolves, very large volume of traffic data can be obtained in real-time. Traffic data are continuously produced and they can be considered as a kind of stream data. Currently, such traffic data are not maintained permanently because of the storage limitations of operational systems. Therefore, it was impossible to compare temporal historical patterns over long time periods. In this...
To handle the extreme situation that must manage positional information of a very large volume, at least millions, of moving objects, a cluster-based scalable distributed computing system architecture, called the GALIS, which consists of multiple data processors, each dedicated to keeping records relevant to a different geographical zone and a different time zone, was proposed. In this paper, we propose...
Location-based service (LBS) systems have recently become a subject of active research and development. A key issue in such systems is efficient management of current and past location information of moving items. In the past two years, we have been establishing a new LBS system architecture, named the GALIS (gracefully aging location information system), which is based on the new approach of using...
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