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This paper describes a newly developed wireless access system for the wide area ubiquitous network (WAUN), a large cell-based public sensor network. It introduces two key technologies to achieve WAUN with wide area coverage. The first is a digitalized radio over optical fiber (DROF) subsystem that allows cost-effective commercial packet based networks to transfer wireless RF signals among distributed...
In this paper, a platform to manage user-environment interaction is addressed. The core of the methodology consists of a continuous communication between a sensing module hosted on the user and a sensor network distributed in the environment. Such strategy provide the cognitive system with a continuous perception of both the environment and the user. The cognitive system can hence be made aware of...
In upcoming ubiquitous environment, many real-time sensing applications will emerge. These applications show different scale and characteristics on delivery demands. The applications commonly depend on real-time understanding on data from widely distributed data sources. Also, they have highly diverse and complex delivery demands in terms of data and delay, e.g., data value ranges of interest, spatial...
The wireless ubiquitous network and various communication services are expected to be realized. The wireless ubiquitous network is defined as the converged network to integrate the mobile network with the fixed IP based network. First, the concept of wireless ubiquitous network architecture is shown which is based on IMS standardized by 3GPP. Next, Parlay is described as the solution of Open API approach...
Current research efforts at RFID and sensor network technologies have made it possible to perceive real-time location information and physical properties like temperature and humidity in ubiquitous manufacturing and service systems. Complex event processing is the research field that deals with diverse and large amounts of multiple data and event streams for the purpose of identifying meaningful event...
We propose an effective acquisition scheme of sensor data in sensor network for healthcare support. This scheme can dynamically control quality and quantity of sensor data acquired from various sensor devices based on the inference of object person's health condition from real-time analysis of data stream related vital data. In this paper, we show the detail of our proposed scheme and its effectiveness...
With the convergence of ultra-low-power communications and energy-harvesting technologies, networking self-sustainable ubiquitous devices is becoming feasible. Hence, we have been recently developing new devices, referred to as Energy Harvesting Active Networked Tags (EnHANTs). These small, flexible, and energetically self-reliant tags can be seen as a new class of devices in the domain between RFIDs...
The following topics are dealt with: wireless pervasive computing; cooperative communication; physical communication; sensor network; cognitive radio network; ultrawideband communication; vehicle ad hoc network; mobile ad hoc network; wireless personal area network; localization technique; orthogonal frequency-division multiplexing; wireless multimedia service; wireless network; network coding; next...
In this paper, we propose a web-based Japanese mimicry and onomatopoeia learning assistant system (JAMIOLAS). In our previous studies, we have proposed context-aware language learning assistant systems that used wearable sensor and sensor network respectively, and attended good results. In order to use this learning model in broader area and more general scene, we are trying to realize the system...
Previous key management methods are not adequate for secure data communication through cluster-based routing. Because the cluster head is changed at each round in cluster-based routing, it has to take the step of authentication or shared key setting with each member node. In addition, because most of previous key management mechanisms do not assign mobility to all nodes in the sensor network, there...
To provide personal services in a ubiquitous environment, it is necessary to identify users without giving a psychological pressure to them. This paper proposes a configuration of the sensor network used to identify a user based on his or her sole pressure distribution on a sensor mat that uses a hetero-core optical fiber. Specifically, it presents a filtering algorithm used to determine the pressure...
With growing technical achievement in sensor device fields and wireless communication fields, smart monitoring services get more and more attractions in many service markets. Smart monitoring services monitor the interesting targets and/or control the situation according to their policies. Sensor network technology enables smart monitoring services to get necessary sensor data and/or to control appropriate...
With the increasing need for intelligent environment monitoring applications and the decreasing cost of manufacturing sensor devices, it is likely that a wide variety of sensor networks will be deployed in the near future. In this environment, the way to access heterogeneous sensor networks and the way to integrate various sensor data are very important. The COSMOS is a kind of USN middleware that...
We studied the middleware platform for USN (ubiquitous sensor network) for various types of sensor networks such as the Zigbee wireless sensor network (WSN), the CDMA cellular network, RFID and IP-USN based on the 6LowPAN. Our project is focused on sensor network abstraction for various USNs. We defined standard interfaces between USN middleware and USN networks as well as application services. We...
In this paper, an energy efficient adaptive back forwarding method is proposed for spatial range query processing in ubiquitous sensor networks. In order to execute spatial range query efficiently in sensor networks, many rectangle based index methods are researched, such as SPIX method. This kind of method is efficient to transmit user queries to the queried range, but it defines the sensor nodes'...
Ubiquitous robot is a network robot which can communicate with any devices at any time in the surrounding physical space to obtain more diverse view points of the environment. We call ubiquitous computing environment, which the network devices provide the environmental information to the robot in, ubiquitous robotic space (URS). In this paper, a sensor network platform is proposed to build the ubiquitous...
In this paper, the wireless ubiquitous network architecture is described based on IMS which has been standardized by 3GPP (3rd generation partnership program). Then the field data collection system to match the satellite data using location information is described based on the wireless ubiquitous network.
This paper evaluates transmission performance and power-saving effect of the collaborative beamforming for wireless ubiquitous network systems. The evaluation of power-saving includes the power consumption for signal transmission to collaborative sensors in beamforming. The simulation result shows that the total power consumption of the beamforming with 3 collaborative sensors can be decreased to...
We have constructed a self-maintain system based on the concept of the artificial ecological system (AES). Under the framework of the AES, we proposed a model of ecological balancing include the sensor nodes dynamics model (SNDM), the sensor nodes ecological model (SNEM) and the population growth limit model (PGLM). The SNDM is used to implement the diffusion, and the SNEM is used to maintain the...
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