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We designed an information integration system, iPCA, which combined wireless sensor networks with a data mining system, to help anesthesiologists provide better post-operative pain control. To reduce labor work and to collect analgesic usage information and physiological data efficiently, we connected three kinds of medical instruments with Zigbee nodes through IEEE 802.11 and Zigbee networks. We...
The following topics are dealt with: performance modelling; routing mechanism; distributed systems; parallel systems; service oriented architecture; communication technology; protocols; autonomic network systems; Internet computing; ad hoc networks; wireless sensor networks; privacy management; mobile networks; multimedia systems; pervasive computing; ubiquitous computing; security intrusion detection;...
ZigBee is a standard that is suitable for wireless sensor networks. In ZigBee, sensor nodes can be connected by a tree topology called distributed address assignment mechanism (DAAM). It has the merits as follows: 1) it is easy to implement; 2) it simplifies the task of routing. It restricts the number of children and the depth of the network by setting a topological parameter set, which is defined...
This paper deals with human interface for iPod touch used for the tele-operation of robot partners. We develop a tele-operation system based on touch interface of iPod touch. The environmental information is measured through the sensor network, and is stored in the remote host computer. The iPod touch accesses the environment information through wireless LAN, and sends the control outputs to the partner...
We analyzed the requirement of MAC protocol in coal mine, and proposed an improved 802.11 protocol which can adopt RTS/CTS mechanism or not adaptively. This protocol switch the status of RTS/CTS mechanism by comparing the optimal switch value of collision probability with real-time collision probability. The computing formula of switch threshold was given. Simulations show that the adaptive RTS adjustment...
In the context of the EUREKA CELTIC BOSS project, this paper describes how different mesh networks are used inside commuter trains in order to enhance security of passengers through automatic abnormal event detection and alarm transmission. Several technologies of mesh networks have been considered for indoor train coverage: wireless sensor networks for event detection based on low-power sensors and...
In this paper, we show the enhanced version of SLPv2 (Service Location Protocol version 2). It is one of the service discovery protocols in wired network, and we propose the wireless network based SLP for WSN (wireless sensor network). If a wired protocol is transferred to the wireless domain, then we have to consider some critical problems, like resource and power wall, etc. So SLP for the WSN must...
In large wireless sensor networks, randomly deployed nodes have to organize themselves as energy efficient as possible to avoid redundant sensor and transceiver operations. In addition to its energy awareness, the network has to guarantee complete functionality as long as possible. This paper presents an enhanced version of the clustering algorithm 2-MASCLE. The proposed 4 MASCLE algorithm combines...
In this paper, we tackle issues on the exposed terminal problem in IEEE 802.11 based wireless networks from a simulative perspective by investigating the internal relationship of node transmission behaviors under various network scenarios. The proposed solution is designed to learn node behaviors according to incoming traffic patterns and to assist wireless nodes make accurate transmission judgment...
In this paper, the WirelessHART communication scheme is investigated. The protocol is at first described, in order to underline the key aspects of its design; then, a simulation tool is presented: it enables analysis that accounts for both protocol and physical layers issues. In particular, interference effects on protocol choices can be easily analyzed. The experimental results, obtained from simulations,...
Wireless communication among sensor devices, enabled by IEEE 802.15.4 protocol, is increasingly replacing the existing wired technology in a wide range of monitoring and control applications. IEEE 802.15.4 networks typically operate in 2.4 GHz ISM band, which is used by popular IEEE 802.11 (WiFi) networks as well. An overlap between the channels used by IEEE802.15.4 and IEEE 802.11 networks may adversely...
The following topics are dealt with: performance modelling; performance evaluation; routing mechanisms; broadcast mechanisms; distributed systems; parallel systems; service oriented architecture; trust management; agent computing; video communication technology; communication protocol; automatic network systems; advanced network systems; Internet computing; ad hoc networks; wireless sensor networks;...
Many new emerging applications involving realtime multimedia communications require sufficient bandwidth, as well as limited delay and minimized packet loss. In special, video streaming, that accounts for a large portion of the traffic in future networks, poses a difficult challenge to wireless networks, due to their strong requirements as well as to the great variability of channel conditions and...
User studies usually involve much organization and manual labor. Even when performed correctly, a common problem of the studies is user bias. This occurs when participating users' knowledge of the study influences their actions. Another problem is the willingness of the users to participate at all. Finally, participants will always have privacy concerns. We have developed a framework to help with...
The multi-hop routing is an indispensable technology for reliable data transmission between sensor nodes in wireless sensor networks. However its realization is very challenging due to various characteristics of wireless sensor networks such as self-organizing, limited resources, data centric routing and others. These characteristics distinguish them from conventional communication and wireless ad...
Environment monitoring in urban areas is becoming important to provide information for safety and relief for daily lives. Wireless sensor devices are regarded as means of such monitoring. However, it is not efficient to deploy the sensors more than the necessity in the city. It is efficient to deploy the sensors on the place where many people move around. Therefore, we install sensors to walking people...
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