• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.941-944
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• 2003

This paper implement Telemetry System which is used Bluetooth. This System propose system which can detect a total amount of gas, electricity or water without a motorman, at home. BlueTooth is a close range wireless communication technology which uses a wireless frequency 2.4GHz and has a high trust and self - error correction technology according to a low power consumption quality and a high-speed frequency hopping. This makes get a high trust concerning a data transmission than an existing modem. In addition, though wireless modem is restricted by a minimal of a wireless terminal, it will be possible to coincide with the function of the portable with the low power consumption quality by using Bluetooth. And as the system on a chip of module progresses, the possibility of the snail size is present. And, Motorman who use mobility of embedded system can detect detect a total amount of gas, electricity or water outdoor. Embedded system use ARM processor that is low power processor. So it ran use long time efficiently.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.5
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• pp.1608-1615
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• 2010

In this paper, we proposed the method called "DoublePico"(Double Piconet) forovercoming low data transmission rate in a scatternet. This needs a new Ad-hoc network topology to transmit with high rate. Every node performs the function of the relay station. DoublePico has two bluetooth devices that should form two different poconets; every node can make a link between two different piconets. Two different piconets are linked in one node by the link with two bluetooth divices thereby forming the Ad-Hoc network. In this paper, we shows the method of DoublePico which supports about 457kbps of the maximum data transmission rate. This method supports a higher data transmission rate than the traditional bluetooth's Ad-Hoc topology by using analysis and comparison of existing algorithm of bluetooth specification and simulation results. Specifically, this paper focuses on the impact of intererence on the PER (Packet Error Rate), throughput performance, and the throughput improvement with SAW(Stop and Wait)-ARQ scheme in DoublePico.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06c
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• pp.366-369
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• 2007

위치정보는 사용자에게 유용한 서비스를 제공하는데 필요한 주요 컨텍스트 중의 하나로, 이를 얻기 위해 GPS(Global Positioning System)가 널리 사용되고 있다. GPS는 위성신호를 이용하기 때문에 별도의 기지국이 필요 없고 전 세계를 포함하는 넓은 가용범위를 갖지만, 도심과 같이 높은 건물이 많은 지역에서는 수신이 어렵다는 단점이 있다. 본 논문은 주변기기들의 위치정보를 공유 받아 모바일 기기의 GPS 정보손실을 복구하는 알고리즘을 제안한다. 먼저 주변의 모바일 기기나 기지국의 유효한 위치정보를 근거리 통신의 애드혹 네트워크인 스캐터넷을 통해 공유받는다. 그 후, 근거리 통신의 가용범위와 지도상의 지형정보를 함께 고려하여 복구 알고리즘을 통해 자신의 위치를 추측한다. 본 논문에서는 최근 모바일 기기에 기본으로 장착되는 근거리 통신기술인 블루투스(Bluetooth)를 가정하여 시뮬레이션 환경을 모델링 하였으며, 실험결과 제안하는 방법을 통해 손실된 GPS 정보의 상당부분이 복구되는 것을 확인하였다.

• Proceedings of the KSR Conference
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• 2003.10c
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• pp.587-593
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• 2003

There has been much interest in the Bluetooth technology since it could enable users to connect to a wide range of computing and telecommunication devices without the need to carry or connect cables. It delivers opportunities for rapid, ad-hoc connections, and in the future, could possibly enable automatic, unconscious, connections between devices. In this paper, we discussed a scatternet formation protocol for Bluetooth-based ad hoc networks and proposed the identification system of an object using Bluetooth Scatternets. Over the past few years, several studies have been made on the identification of an object by several RF(Radio Frequency) systems. But there are still some problems, the interference of signals as an example, for the identification of an object. The critical question is how to identify an object precisely without the interference of signals. This paper is an investigation of the Scatternet formation protocol for Bluetooth-based ad hoc networks and the identification system of an object using Bluetooth Scatternets composed of multiple Piconets.