• 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.

• Journal of Integrative Natural Science
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• v.1 no.2
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• pp.122-126
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• 2008

The stress is an unavoidable result and a complex phenomenon in modern society. too, Human activity changes under control of the stress. The stress is a reaction to adrenalin or other stress hormones. It provides the power for fighting and the energy for going away from dangers. Because of the stress, our bodies increase the pulse, the blood pressure and the breath for more blood and more oxygen. So, in this research, we are measuring those which was increased by the stress. Also we will examine the change of HRV and APG on music. After that, in order to reduce the stress, we will design matching system that is based on the sense for music by using Zigbee.

• Proceedings of the IEEK Conference
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• 2007.07a
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• pp.39-40
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• 2007

In this Paper a transmission algorithm based on Zigbee Networks is proposed. The superframe of IEEE 802. 15.4 is applied to the transmission method of real-time mixed data (periodic data, sporadic data, and non real-time message). The simulation results show the real-time performance of sporadic data is improved by using the proposed transmission algorithm.

• Journal of information and communication convergence engineering
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• v.5 no.1
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• pp.73-77
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• 2007

This paper discusses the implementation of a rehabilitation center based on a ubiquitous sensor network. This paper discusses the implementation of a rehabilitation center based on a ubiquitous sensor network. We recognize that certain mild conditions requiring rehabilitation may be treated with minimal human supervision. In place of this constant human supervision, a variety of sensors are used to monitor the patient and rehabilitation progress. These sensors send data through a wireless Zigbee network to a server which stores the data and makes it available to a rehabilitation expert for analysis. This rehabilitation expert also issues rehabilitation prescriptions which are created based on the expert's determination of the patient's condition. By having the ability to control the rehabilitation equipment used, strictly enforce the assigned prescription, and constantly monitor the patient for any warning signs, the system ensures a safe and optimal rehabilitation session.

• Journal of Korea Society of Digital Industry and Information Management
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• v.4 no.3
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• pp.1-8
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• 2008

Recently, a great many people are concerned about promoting their health because medical science and scientific technology has become much larger and more develop. Thus, the person who interested in health wants to confirm his condition whatever he may take a meal or exercise. But it is disappointed of our expectation. By reason that many people doesn't know what changes will occur in their body. In this paper, we are going to introduce our Health Care Managing System which could display a physical variation, in addition, we will also propose how to control serial data from wireless sensors. We implemented this system using ZigbeX and Java application.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.64 no.2
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• pp.50-56
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• 2015

This paper presents a smart monitoring technique for photovoltaic power systems by using wire and wireless communication networks in which the RS-232/484 and the Zigbee communication networks are inherently established respectively. In the proposed monitoring systems, environmental data sequences and the output power measured by sensors in photovoltaic systems are transferred to PC systems via two communication networks. We made electronic hardware boards for sensors and communication networks to construct its real-time monitoring system and carry out experiments for demonstrating reliability of the proposed monitoring system.

• Journal of Advanced Navigation Technology
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• v.17 no.6
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• pp.664-671
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• 2013

In this paper, in an aircraft power can be measured by wireless AEMS (aircraft electric power measurement monitoring system) system is proposed. AEMS has been design based on current commercialized power measuring systems analysis with improvement and connects it with most talked about item, smart phone and monitoring system. And also adopting real time power measuring system, constitute more practical power measuring system by controlling electricity usage in real time.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.04a
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• pp.1014-1016
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• 2014

기존 가로등 유지보수시스템을 위한 모니터링 기술은 크게 CDMA양방향통신, Zigbee 혹은 USN을 이용하는 방법, 분전함 단위로 PLC를 이용하는 방법 등이 있다. 그러나 CDMA방식은 높은 회선사용료를 지불해야 하며, Zigbee 혹은 USN을 이용한다. 본 연구를 통해 그룹단위로 감성조명과 고장진단을 위한 LED 가로등 고장진단 시스템을 설계 구축하고, 핵심 컴포넌트인 BSD(Brightness Sensor Device)를 설계 및 구현하였으며, 실험을 통해 효용성을 검증하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.1133-1135
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• 2012

본 논문에서는 IEEE 802.15.4 Zigbee 통신기술을 이용하여 센서 네트워크를 구성하고 사용자의 위치를 사용자가 소지한 Zigbee 동글로부터 수신된 단말 정보와 사용자의 미디어 히스토리 정보를 기반으로 모바일 디바이스와 PC와 같은 디스플레이 자원에서 개인화된 멀티미디어 콘텐츠 이어보기 서비스를 제공하는 서비스 플랫폼을 제안하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.853-856
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• 2007

본 논문에서는 RFID 기술과 유비쿼터스 센서네트워크 기술이 적용된 도어락과 출입에 필요한 카드 및 무선 도어락 정보를 관리하고 모니터링 하는 출입 통제 시스템(EMS:Entrance Management System)을 개발하였다. 근거리 무선통신 표준인 Zigbee와 비접촉식 RFID 기술이 적용된 도어락 그리고 무선 도어락과 Zigbee로 통신하는 ARM코어 기반의 도어락 제어 모듈을 개발하였고 출입통제에 사용되는 응용프로램을 웹기반으로 개발함으로써 출입통제 시스템의 접근과 관리가 용의하도록 하였다.