• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.05a
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• pp.631-634
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• 2009

Recent advances in wireless communication, electronics, MEMS device, sensor and battery technology have made it possible to manufacture low-cost, low-power, multi-function tiny sensor nodes. A large number of tiny sensor nodes form sensor network through wireless communication. Sensor networks represent a significant improvement over traditional sensors, research on Zigbee wireless image transmission has been a topic in industrial and scientific fields. In this paper, we design a Zigbee wireless image sensor node and multimedia monitoring server system. It consists of embedded processor, memory, CMOS image sensor, image acquisition and processing unit, Zigbee RF module, power supply unit and remote monitoring server system. In the future, we will further improve our Zigbee wireless image sensor node and monitoring server system. Besides, energy-efficient Zigbee wireless image transmission protocol and interworking with mobile network will be our work focus.

• The Journal of the Korea institute of electronic communication sciences
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• v.15 no.2
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• pp.245-252
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• 2020

Unexpected equipment defects can cause a huge economic losses in the society at large. Although condition monitoring can provide solutions, the signal processing algorithms must be developed to predict mechanical failures using data acquired from various sensors attached to the equipment. The signal processing algorithms used in a condition monitoring requires high computing efficiency and resolution. To improve condition monitoring on a wireless sensor network(WSN), data visualization can maximize the expressions of the data characteristics. Thus, this paper proposes the extraction of visual feature from temperature data over time using condition monitoring based on a WSN to identify environmental conditions of equipment in a large-scale infrastructure. Our results show that time-frequency analysis can visually track temperature changes over time and extract the characteristics of temperature data changes.

• Tunnel and Underground Space
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• v.29 no.2
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• pp.108-123
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• 2019

In recent years, as safety management in underground mines has become more important in the worldwide, mine safety management technologies combining information communication technology such as real-time worker position tracking, monitoring system and equipment remote control have been developed. Wireless communication system is mainly applied to these technologies for the flexibility of network configuration. There are some cases the monitoring system was installed in domestic underground mines, but, it is necessary to develop the technology more suitable for domestic mining standard. In this study, we developed the real-time environmental monitoring system using ZigBee technology and examined the result of application to domestic limestone mine. Furthermore, applicability of the developed environment monitoring system to $VentSim^{TM}$ LiveView was checked. This study is expected to contribute to the related studies like the optimization of the ventilation system in underground mines.

• Tunnel and Underground Space
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• v.28 no.3
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• pp.209-231
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• 2018

Severe mine disasters have continued to occur around the world. To ensure worker's health and safety and enhance the productivity, a number of studies have been conducted for the development of wireless sensor network (WSN), environmental monitoring, and communication system in underground mines. An increase in development and application of these systems has just begun with the introduction of information and communication technology into the mining industry in Korea, and yet there have been only a few studies that considered the underground mine ventilation system. This study presented the literature review on the development of WSN and environmental monitoring in underground mines, and especially, on 7 subjects in terms of underground mine ventilation. Moreover, studies that especially conducted real-time environmental monitoring were reviewed and categorized by each commercial software commonly utilized for the ventilation network analysis. For the application in domestic underground mines, further issues were discussed regarding research subjects that may be needed in the future and domestic environmental standards that has been used in the underground mine operation. This paper is expected to be useful for the development of WSN-based environmental monitoring and communication system, as well as for related studies in the future.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.8
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• pp.1713-1720
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• 2009

An local area weather condition monitoring system to minimize many disasters from the sudden change of weather condition in local and mountain ales is proposed. Firstly, the comparison of present state of the related monitoring systems and the possibility of realization with some merits are investigated. Moreover, this paper present direction of local area weather condition monitoring system based on integration of wireless sensor network and CDMA network following some case study. The sensor node for wireless sensor network and an interface dongle are fabricated for the system. The stand-alone software in cellular phone is also developed. Through the efficient integration of both networks, the measured weather condition data from sensors can be transmitted to the server or mobile to monitor with high reliability. The proposed monitoring system will guide new type of project in wireless sensor network and support alarm service of the sudden change of weather condition to mobile user from central official regulations.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.429-432
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• 2008

의료서비스 분야에서 유비궈터스 IT 기술과 헬스케어 기술을 접목함으로써 일상생활 중 지속적으로 건강상태를 모니터링하여 항상 건강한 상태의 유지가 가능하도록 하는 유비쿼터스 헬스케어기술이 급부상하고 있다. 본 연구에서는 유비쿼터스 헬스케어와 관련하여 일상생활 중 활동 상태에 따른 가속도 변화를 측정하여 활동 상태를 판단하고 활동량을 정량화하기 위한 지표를 개발하고자 하였다. 먼저 활동상태에 따른 가속도 정보를 측정하기 위해 단일침의 3축가속도 센서를 사용하였으며, 아날로그 가속도신호를 디지털로 변환하고 데이터의 무선전송을 위해 무선센서네트워크 기술을 적용한 센서노드를 활용하였다. 그리고 무선으로 전송된 가속도 신호를 PC또는 휴대형 단말기에서 모니터링하기 위해 모니터링 프로그램을 구현하였다. 계측된 가속도 신호로부터 활동상태의 분류 및 활동량의 정량화를 위한 방법을 제시하고 그 타당성을 평가하였다.

• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.491-492
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• 2008

무선통신 기술과 모바일 장비의 발전에 따라 의사는 언제, 어디서나 환자의 상태를 실시간으로 모니터링 할 수 있게 되었다. 이 연구에서는 원격지 PC에서 인코딩한 환자의 비디오 영상을 무선통신으로 전송한다.[1] 이때, 모바일 장비(PDA)는 PC에서 보낸 비디오 영상을 전송 받고, 디코딩하여 화면에 출력한다. 이번 논문에서 개발한 시스템은 후자에 기술된 모바일 실시간 비디오 모니터링 시스템이다. 개발에 사용된 비디오 코덱은 MPEG-4 계열의 오픈소스 코덱인 Xvid이다. 데스탑 PC용 Xvid 오픈소스를 모바일 디바이스에서 사용할 수 있도록 컨버전하여 사용하였다. 무선 통신망은 WiBro를 사용하여 고화질 비디오를 전송받을 수 있는 대역폭을 확보였다. 이 논문 목적은 의사가 PC앞에 앉아 있지 않아도 이동간에 환자의 현재 상태를 실시간으로 확인할 수 있음으로서 의사의 작업효율을 증진시키는데 있다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1239-1240
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• 2015

본 논문은 구강내 장치를 이용한 악정형 치료에 있어 환자가 장치를 장착하는 시간과 적용되는 응력과 변형률을 측정하여 치료결과의 완성도를 높이는 데에 있어, 근접무선통신 장치인 NFC(Near Field Communication)를 매개로하여 구강내외 장치의 상태를 모니터링하는 방안에 대한 고찰을 중점적으로 수행하였다. 구강내외에 상태를 계측하기 위한 센서를 설치하고 근접무선통신을 이용하여 병원에서 내원한 환자 상태의 모니터링을 구현하는 시스템을 설계하였으며 무선전력송신 시험을 수행하여 설계변수에 대한 민감도를 살펴보았다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.946-949
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• 2007

A wireless sensor network (WSN) is a wireless network consisting of spatially distributed autonomous devices using sensors to cooperatively monitor physical or environmental conditions, such as temperature, sound, vibration, pressure, motion at different locations. Environmental monitoring represent a class of sensor network applications with enormous potential benefits for scientific communities and society. In this paper we design and implement a novel platform for sensor networks to be used for monitoring of temperature, humidity, and light sensors.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.11a
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• pp.1137-1140
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• 2005

기존의 방대한 무선 인프라와 최근 이동 단말기의 발달로 무선통신 기술을 이용한 서비스 이용이 잦아졌으며, 이를 관리하기 위해 기존의 모니터링 시스템들은 표준화되지 않은 지리 정보 속성을 바탕으로 단일 이동 단말기에서만 적용 되었다. 따라서 표준화된 GIS(Geographic Information System)에서 이동하는 여러 개의 무선 시스템을 효율적으로 관리하며 제어 할 수 있는 시스템이 필요하게 되었다. 본 논문은 WIPI(Wireless Internet Platform for Interoperability)에서 제공되는 GML(Geography Markup Language) 위치 정보 시스템을 서버에서 통합 추적 할 수 있는 모니터링 시스템을 설계한다. 또한 이 시스템은 OGC(Open GIS Consortium)에서 제안한 GML 3.1을 기반으로, 여러 WIPI 사용자들의 공간 정보를 획득 및 저장하여 이를 추적 관리 할 수 있다.