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Recently, a demand for flexible “group communication” considering users' real-spatial information such as location and property is increasing drastically. To achieve this, we proposed the “r-Space system” that mainly consists of (a) users' data collection and (b) data delivery. In this research, we focus on data collection that can be applied to mobile nodes. Since the r-Space system delivers application...
Widespread high-performance mobile stations and wireless communication technologies make it possible to enjoy various network services anywhere at any time. In particular, social network services (SNSs) provide a wide variety of communication among users. We aim to achieve real-space communication that directly integrates information exchange and real-space activity in our daily lives. Therefore,...
For a computer network in the era of big data, we discuss a behavioral anomaly detection system which makes it possible to analyze and immediately detect anomaly traffic behavior. Many sensor devices connect to the network and tend to generate their application traffic at quite a low communication rate. In order to observe necessary traffic information for traffic analysis in a short time, the monitoring...
For a computer network in the era of big data, we discuss a behavioral anomaly detection system which makes it possible to analyze and immediately detect anomaly traffic behavior. Many sensor devices connect to the network and tend to generate their application traffic at quite a low communication rate. In order to observe necessary traffic information for traffic analysis in a short time, the monitoring...
We have been conducting an ecological observation of seabirds. In the previous study, the system has utilized the wired network, and has been difficult to construct a scalable sensor network. Furthermore, that system couldn't distinguish types of the seabirds (e.g., male/female parent, chick), which is useful information for biologist to verify their hypothesis. Therefore, in this paper, we propose...
A sensor platform, which can accommodate various types of sensors and can extract the meaningful information from the sensor data, is necessary for building a sensor network system. In this study, we propose a new sensor platform, Arkas, which can be easily utilized for various environmental observations. The Arkas sensor platform consists of a sensor node which is designed for easy-to-use management...
A measurement of the pedestrian traffic becomes a key issue for supporting guidance of safety and for investigating a viewer's evaluation of an advertisement in a shopping district. In this paper, in order to measure the pedestrian traffic, we propose a new pedestrian observation system using ultrasonic distance sensors. From an experimental evaluation in a shopping street, we have confirmed that...
The scale, diversity, and decentralized administration of the Internet mean that to continuously acquire the global status of the network and to timely identify the causes of communication performance degradation is reasonably difficult. However, emerging advanced network applications, which are often sensitive to communication quality and bandwidth consumption, as well as increasing security threats,...
In grid computing environments, a resource control that considers not only the ability of computer resources but also available network resources is needed in order to execute parallel and distributed processing effectively. In particular, the execution performance of a grid application will sometimes decrease due to the congestion caused by multiple flows running on the same network path. Therefore,...
The Wideband Inter Networking engineering test and Demonstration Satellite (WINDS) has an ultra-high speed international Internet-based communication system. However, the characteristics (for example, transmission bit errors, large propagation delay) of its satellite communication markedly degrade a throughput of conventional TCP (TCP Reno). Therefore, the satellite communications should adopt an...
It becomes so important to observe a wild life for obtaining not only knowledge of its biological behaviors but also interactions with human beings in terms of geoenvironmental investigation and assessment. A sensor network is considered to be a suitable and powerful tool to monitor and observe a wild life in fields. In order to monitor/observe seabirds, a sensor network is deployed in Awashima island,...
In a grid computing environment, a grid resource control that considers not only the ability of the computer resources but also the available network resources is needed in order to execute parallel processing effectively. In particular, there is a possibility that the execution performance of a grid application decreases because of the congestion created by two or more flows that are generated on...
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