• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.1222-1225
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• 2009

본 연구개발은 ZigBee 리더기와 단말기 사이의 통신 프로토콜을 설정, ZigBee 단말기에서 전송하는 데이터를 호스트에서 수집/가공/처리할 수 있는 정보시스템을 설계하고 구축하는 것을 목표로 한다.

• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.4
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• pp.849-853
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• 2012

Generally, it is not easy to learn guitar fingering for beginner. In this paper, therefore, we attach LED to flat board of guitar to more easily teach the beginner and also implement LED control system that can connect ATmega 128 in order to drive LED attached to guitar. The guitar's flat board is connected with ATmega 128 as communication method of Zigbee. We also develop UI that easily can be learned code and playing for guitar, programmed by guitar fingering and perform the research for guitar fingering using LED.

• 한국정보통신설비학회:학술대회논문집
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• 2009.08a
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• pp.379-381
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• 2009

본 논문에서 제안안하고 있는 긴급 SOS 시스템은 응급상황에 처한 사람의 위치를 빠르고 정확하게 추적하여 구조하는 위치기반 서비스이다. 제안된 시스템에서 일반상황에서는 근거리, 저전력 통신방식인 Zigbee Network를 사용하지만 응급상황 발생시 802.15.4의 Network를 이용하여 주변 핸드폰에 응급신호를 전송한다. 또한 전송된 응급 신호를 응급신호 추적기에서 수신하여 능동형 위치추적 알고리듬을 기반으로 위치를 추적한다. 본 논문은 제안된 긴급 SOS 시스템에서 배터리 소모를 줄이기 위한 프로토콜, 일반상황과 응급상황에 적합한 네트워크 구조를 제안하고자 한다.

• 한국IT서비스학회:학술대회논문집
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• 2009.05a
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• pp.327-330
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• 2009

무선랜 (WLAN)과 지그비 (Zigbee)는 동일한 2.4GHz대의 비면허 주파수 대역(ISM-Band)을 사용하기 때문에 네트워크 간의 주파수 간섭이 발생한다. 더욱이 지그비의 경우 무선랜의 채널과 중첩되지 않는 채널은 단 두 개 채널에 불과하기 때문에 무선랜의 주파수 간섭을 받을 경우 통신 지연 시간의 증가가 불가피 하다. 이에 본 논문에서는 지그비와 무선랜 간의 주파수 간섭으로 인해 발생하는 통신 지연 시간 최소화를 위한 빠른 채널 변경 알고리즘을 제안한다. 이와 더불어 제안 알고리즘의 성능 분석을 위해 모의실험을 수행하였고, 그 결과 제안 알고리즘의 통신 지연 시간이 감소됨을 확인하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.05a
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• pp.871-872
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• 2014

In this paper, I propose the method of cooperative work of swarm robot for escaping maze. The robots can communicate with each other using Zigbee, but the central control system send commands to robots because of low processing power of robots. Robots navigate the blinded maze and send information such as movement to the central control system for building map. The central control system analysis the received data and find path to escape from maze.

• Smart Media Journal
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• v.5 no.3
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• pp.74-80
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• 2016

In this paper, we propose an accident-prevention smart monitoring system for Haenyeo(Woman diver) using Zigbee module and GPS sensor. This system can collect such information as the diving location, the body temperature, the depth of diving, and the diving time of a Woman diver working under the water and then respond immediately to an accident occurring. The research developed a smart Teawak and smart swimming goggles which can measure the state of a Woman diver and her diving activities. Smart Teawak, the buoy tool while a Woman diver is collecting seafoods under water, is able to receive GPS and transmit the data from smart swimming goggles and Zigbee Module to IHSS(IoT based Haenyeo Safety service Software) server. In addition, IHSS, a responsive web, provides the diving location and the state of a Woman diver on the smart phone. As a result, the system will be useful in the aspects of Woman diver' health care and the safety, furthermore, which will significantly contribute to global marketing of Woman diver with its being designated as a UNESCO intangible cultural asset.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.10a
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• pp.787-790
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• 2015

Recently, M2M (Machine to Machine) communication is possible the development of MTC (Machine Type Communication) devices becomes active. MCT devices in the form of home appliances have a low power consumption, low cost, short-range wireless communication in wireless home network. For purpose, MTC devices based on IEEE 802.15.4/Zigbee are composed in the form of cluster-tree topology, which consists of one PAN (Personal Area Network), one or other router and end of nodes. It happens that transmission delay, packet drop, and lacking data resulted from collision originated by a competition for allocating channels among MTC devices that greatly increased. At last performance of entire network can be degradated. This paper proposes that the beacon frame-based grouping algorithm using multiple channels in a MTC devices in the presence of wireless home network interference. The proposed algorithm decreases the transmission delay, dropped packet and throughput is more increase, so the proposal algorithm is more efficient than the IEEE 802.15.4/ Zigbee standard.

• TTA Journal
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• s.101
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• pp.91-98
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• 2005

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37C no.9
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• pp.774-783
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• 2012

A simple, accurate, secure, long-lasting, and portable hybrid positioning system is proposed and designed in this paper. It consists of a lighting LED that generates visible light data corresponding to position information of a target and a Zigbee wireless network communication module with low power, security, and service area expansion characteristics. Under an indoor environment where there is 23.62m distance between an observer and the target, the presented hybrid positioning system is tested and is verified with the functions of Zigbee three hop wireless networking and visible light communication (VLC) scheme. The test results are analyzed and discussed.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.5
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• pp.287-291
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• 2010

In this paper, we designed and implemented mobile object automatic system based on senor networks for telematics. For developing this system, we gather the various sensing data through wireless communication method using zigbee sensor networks and analyze them in monitoring equipment. And we enable the driver to recognize the car state information on the whole by interfacing analyzed data to telematics unit. And, we implemented automatic controller that can control temperature and humidity in car automatically by actuating air conditioner based on the data that was monitored throughout temperature sensor, humidity sensor and brightness sensor based on sensor networks.