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This paper proposes construction technology for a Smart Tap Home Energy Management System (HEMS) that can make the energy consumption of living environment information and the consumer electronics visible using Wireless Sensor Networks (ZigBee). This technology solves the problem of the introduction cost of the HEMS spread Also, HEMS can be easily constructed in homes or the offices without modifying...
This paper presents a novel technique for multi-hop localization by using mobility (MLM) in mixed line-of-sight/non-line-of-sight (LOS/NLOS) environments. In MLM, nodes equipped with ultra-wideband (UWB) radio first move randomly for collecting time-of-arrival (TOA) measurements and then apply a modified biased Kalman filter (MBKF) designed for mitigating NLOS errors. NLOS bias in the measurements...
Energy consumption has been increasing over the past half century. Even though ultra-low power consuming appliances are being developed, the amount of energy consumption in homes is increasing because of various appliances being produced for ubiquitous smart home. We propose an adaptive home/building energy management system (A-HEMS/BEMS) for controlling energy consumption using the convergence of...
Reprogramming sensor nodes is an effective way to improve wireless sensor networks. The latest reprogramming protocols use radio communication to distribute software data. In large-scale sensor networks, several base stations are placed to disseminate software fast, but performances of reprogramming protocols for multi-base station environments have not been discussed. In this paper, we evaluate the...
We propose the sensor network where two different media of wireless communication and wire communication are used in a mutually. This sensor network, called mutually complementary multichannel sensor network (MMSN), can mutually complement the route in which communication is not possible via radio frequency or power lines. We defined the concept and architecture of MMSN. Recently, the amount of research...
This demonstration presents the system shown in the paper accepted at CCNC 2009 [1]. By using this system, control of a network camera programmed to be activated by a sensor is possible. With mobile devices, a user can set or delete the service, which would be executed when a predefined event occurred. When a situation satisfies the predefined criteria of the program utilizing the sensor, this architecture...
The design and implementation of home appliance control based on information from sensors is presented. In a ubiquitous networking society, there are a lot of devices connected to a network. However, many kinds of networks coexist, and they use different communication protocols. Therefore, a technology to integrate different networks is necessary to provide flexible services, which can control various...
We have developed a wireless multi-hop localization game, i.e., a war game, based on a classical field game. The players use mobile game consoles with ad-hoc networking capability and play the game on a field. The fundamental concept underlying a wireless multi-hop localization game is that players on a team establish an ad-hoc network to estimate their positions and then compete for positioning accuracy...
Event detection is important due to be demanded for many kind of application or service about SNW (sensor network). But traditional methods of event detection assume that events are detected in only one SNW. As an environment where many sensors, persons and different kinds of object exist, move and communicate with one another is appearing, it should be taken into account composite event detection...
We investigate ways to reduce the delay when transferring media streams among networked media devices based on session initiation protocol (SIP) and its extensions. We assume that cellular phones act as control points (CPs) for media devices connected to home networks and call such networks "mobile personal area networks (mPANs) ". We propose a pre-negotiation scheme for SIP streaming mobility...
Node localization obtained by estimating node positions is an essential technique for wireless multi-hop networks. In this paper, we present an optimized link state routing (OLSR)-based localization (ROULA) that satisfies the following key design requirements: (i) Independency from anchor nodes, (ii) robustness for non-convex network topology, and (iii) Compatibility with network protocol. ROULA is...
We developed a HAT (home appliance translator) and a HAT-CP (HAT control point) to enable conventional appliances without telecommunication capabilities to connect to home networks. The demand is rising for home appliances capable of connecting to networks so that they can be remotely controlled; however, purchasing appliances already with these capabilities, which we call information appliance, places...
Security has become an essential requirement for some realistic applications on wireless sensor networks (WSNs). However, the stringent constraints on sensor nodes make security providing in WSNs very challenging. In this paper, we propose an improved key management scheme named as low energy key management (LEKM) for WSNs. In LEKM scheme, a key cluster consisting of multi continuous keys is stored...
This paper describes the implementation and evaluation of a method of multiple path distribution of traffic based on delay-jitter. Multiple path communication is designed to conform to the speed and reliability of wireless communication through the simultaneous use of multiple Internet link mobile hosts and by dispersing the traffic between mobile hosts and a correspondent host. The performance of...
Energy efficiency has been known as the most significant problem in all facets of the wireless sensor network operations. For energy-aware routing scheme for the wireless sensor networks, it is necessary to use sub-optimal paths occasionally to increase the survivability of networks. In this paper, we present a new network lifetime definition and formulate the energy-aware routing problem with defined...
A Ka-Band(21GHz) 20W-class SSPA for the advanced mobile satellite communications system in the COMmunication and broadcasting Engineering Test Satellite (COMETS) has been developed. This SSPA employs MMIC technology to achieve high performance in the Ka-Band region. A maximum output power of 24W with an efficiency of 10.4% including the DC/DC converter has been achieved. This is the best performance...
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