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A new generation network is expected to keep operating and providing users and applications with means of communication while being exposed to dynamic and substantial change in the operational environment such as network topology, traffic, and QoS requirement. To establish a highly adaptive and reliable network, we take an approach to be inspired by biological systems, which adapt themselves to dynamically...
In this paper we propose a transmission range reduction scheme for a clustered wireless sensor network (WSN), in order to reduce power consumption while maintaining the network connectivity, particularly in scenarios where consecutive reporting of sensing values is inherent in the network. The platform WSN is based on a multi-hop clustering algorithm, where clusterheads send information to the sink...
In the future, wireless sensor networks (WSNs) are expected to play an important part in our everyday life. Sensor nodes are becoming more and more miniaturized, equipped with radio transceivers, and deployed in large quantities. However, due to their limitations in computational and communication capabilities, clustering techniques are usually applied for energy conservation, where designated nodes...
An emerging new generation network is requested to accommodate a enormous numbers of nodes with high diversity and a wide variety of traffic and applications. To achieve higher scalability, adaptability, and robustness than ever before, in this paper we present new network architecture composed of self-organizing entities. The architecture consists of the physical network layer, service overlay network...
In this paper we propose a clustering and routing scheme for wireless sensor networks based on a self-organizing approach. The aim of this approach is for nodes to perform an integrated emergent task (data gathering and reporting to the sink) by simply following rules based on their individual local environment. Clusterhead election is also performed in a distributed manner and is based on sensors...
This paper introduces a new sensor network testbed, X-sensor, that integrates multiple sensor networks deployed at different sites. X-sensor provides three functionalities: (a) a sensor network search which enables users to find a sensor networks appropriate for experiment and data acquisition, (b) a sensor data archive which provides users with various sensor data acquired by sensor nodes, and (c)...
Wireless sensor networks are an important research area that has attracted considerable attention. Most of this attention, however, has been concentrated on WSNs that collect scalar data such as temperature and vibration. Scalar data can be insufficient for many applications such as automated surveillance and traffic monitoring. In contrast, camera sensors collect visual data, which are rich in information...
In this paper we propose an architecture which integrates the notion of self-adaptability and self-organization in the pervasive computing architecture. Furthermore we describe how a biologically-inspired approach may be a good candidate for this purpose in order to provide a resilient, self-adaptive system similar to living biological systems. Additionally the emergent intelligence that would ultimately...
In ambient information society, a variety of networks consisting of sensory and computational devices are embedded in the environment and individuals. They are autonomously connected, merged, and divided depending on the context and provide a network service appropriate for time, place, occasion, and individuals. In this paper, we investigate how such dynamic network formation is performed focusing...
In wireless sensor networks (WSNs), the frequency of sensing and data gathering depends on application requirements and surrounding conditions. In this paper, we propose a data gathering scheme adaptive to sensing requirements for WSNs composed of sensor nodes with multiple sensing capabilities. To accomplish self-organizing control, we adopt the response threshold model for adaptive sensing task...
A new generation network is requested to accommodate a enormous amount of nodes with high diversity and a wide variety of traffic and applications. To achieve higher scalability, adaptability, and robustness than ever before, we propose new network architecture in this paper. The architecture consists of the physical network layer, service overlay network layer, and common network layer mediating...
Considering characteristics of wireless sensor networks,control mechanisms must be scalable, adaptive, robust, fully distributed, and self-organizing. In this paper, we focus on topology control for periodic data gathering, which certainly is one of typical applications of WSNs. We propose a novel mechanism based on a biological self-organization mechanism, that is, a reaction-diffusion model, to...
Due to the limitation of wireless communication capacity, a camera sensor network will be easily congested and the perceived video quality considerably deteriorates, when all nodes generate and transmit high-quality video data. To tackle this problem, taking into account that not all video data are equally important from a viewpoint of surveillance or observation applications, our research group proposes...
In this paper, we present a disaster-scale mapping and energy-efficient alerting scheme that can be used in disaster monitoring environments that are prone to node failure and destruction due to the occurrence of disasters, and are generally deprived of GPS capabilities and or availability. The mapping scheme is able to provide a distributed mean of monitoring and reporting disaster's location which...
In this paper we propose a distributed and self-organizing scheme for establishing efficient energy-saving concurrent data dissemination for wireless sensor networks. The proposed protocol is aimed at applications where all sensor nodes need to provide their current data concurrently and periodically back to the sink, whist having an option to provide instantaneous individual node data upon sensing...
Without any control mechanism, a wireless ad-hoc network is easily congested and the perceived quality of applications considerably deteriorates. Therefore, we need QoS control mechanisms to accommodate real-time multimedia application such as video conferencing, VoIP (voice over IP), and remote monitoring while satisfying application QoS requirements. In this paper, we propose a new routing mechanism...
This paper proposes a congestion control method for a wireless mesh network. Each intermediate node has separate transmission buffers for each of next hop nodes. By following the mathematical reaction-diffusion formulation, an intermediate node simultaneously performs 'local optimization' control that balances buffer occupancy among its transmission buffers and 'global optimization' control that suppresses...
In wireless sensor networks used as a social infrastructure, urgent information, such as a fire alarm, is needed to be transmitted as fast and reliably as possible. In this paper, we propose design methodology for a sensor network which provides preferential control of urgent information over other non-urgent information. In our methodology, several simple mechanisms which function in different spatial...
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