• Proceedings of the KIEE Conference
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• 2001.11c
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• pp.319-322
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• 2001

본 논문에서는 고층빌딩의 화재감지/모니터링 시스템에 대한 기준 모델을 제시하고 제시된 모델의 성능을 시뮬레이션을 통하여 검증하였다. 본 논문에서 제시하는 화재감지/모니터링 시스템 모델은 CSMA/CD 방식으로 동작하며 100 Mbps의 전송속도로 동작하는 Fast Ethernet을 백본망으로 사용하고 하부망으로는 MS/TP를 사용한다. 또한 시스템의 확장성과 유연성을 확보하기 위하여 현재 국내 빌딩 자동화 통신망의 표준 프로토콜로 제정된 BACnet을 기반으로 동작한다. 본 논문에서는 제시된 화재감지/모니터링 시스템 모델의 성능을 분석하기 위하여 이산사건 시스템 모델링 전용 툴인 ARENA를 사용한 시뮬레이션 모델을 개발하였다. 개발된 시뮬레이션 모델을 이용하여 네트워크 지연시간이 화재감지/모니터링 시스템의 성능에 미치는 영향을 분석하였으며, 분석된 결과를 바탕으로 본 논문에서 제시한 화재감지/모니터링 시스템 모델이 고층빌딩의 방화 설비 요구사항을 만족시킬 수 있음을 검증하였다.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2009.05a
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• pp.347-349
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• 2009

Unmanned helicopters are needed in various fields such as monitoring system, agriculture and forest fire. Swash plate is a essential part for exact driving of unmanned helicopter. And it is usually produced by machining. In this research, hot forging process of upper swash plate has been studied to improve proof stress against repeated loading of the product. In the forming analysis, design parameters such as effective stress, effective strain and distribution of damage have been considered in the hot forging.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2008.05a
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• pp.551-554
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• 2008

In the recent year, Unmanned helicopters of airline industries are using in various industries such as monitoring system, agriculture and forest fire. A unmanned helicopter is needed a powerful engine for transport weighty payload and have to need a light weight. Therefore it is necessary a light weight transmission of the unmanned helicopter. Initially a rectangular transmission housing has been considered, but an empty space in the housing is not useful for light weight design. In this study, new model has been introduced into the transmission housing by using rapid prototyping. As a result, the weight of new transmission housing can be reduced very much as 67%.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.904-905
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• 2014

일반 가정이나 산업 현장에서 화재가 발생할 경우 인명 피해와 재산 피해가 막대하다고 할 수 있다. 이러한 막대한 피해를 막기 위하여 국가에서는 소화방재를 위한 법적 검토와 소방 안전교육 및 피난훈련을 실시하고 있다. 그러나 대부분의 화제 현장에서의 초기 대응은 대부분 분말소화기에 의존하고 있는 실정이다. 현재 새롭게 개발된 청정 소화약제를 활용한 고체에어로졸(fixed aerosol) 소화장치를 개발하여 화재 방지시스템을 개발하고 있다. 본 논문에서는 고체에어로졸 소화장치의 활용에 있어서 불꽃감지센서 및 열 감지센서의 데이터를 활용할 수 있고, 화재 발생 현장에 대한 현장 데이터를 원격지에서 모니터링 할 수 있는 유무선통신기반의 제어기 모듈을 개발하여 원격지 화재 현장을 보다 효율적으로 대응할 수 있는 시스템을 개발하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.1020-1023
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• 2011

최근 스마트 모바일이 성장하면서 다양한 서비스들이 이루어지고 있다. 그 중에 모바일 오피스를 사용할 때 내부 망을 방문해야 한다. 그에 대한 보안 문제는 매우 중요하다. 본 논문은 모바일 기기가 내부 망에 방문할 때 사용자를 인증하기 위하여 통신의 보안 터널과 VPN(Virtual Private Network)기술을 사용하고, 모바일 기기가 내부 망에 방문할 때 OTP(One-Time Password)와 같은 동적인 패스워드 인증을 통해서 안전한 터널과 인증 서비스를 제공한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.1268-1271
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• 2011

유비쿼터스 화재 방재 시스템은 온도, 습도, CO, CO2 등의 다양한 센서로부터 얻는 값을 이용해 화재를 판별하여 관리자에게 전달하고 시스템 설정 값에 따라 소화설비를 동작시키는 지능형 화재 탐지 시스템이다. 기존의 시스템은 센서로부터 얻는 값을 서버의 데이터베이스에 저장하였으며, 모니터링 시스템은 모든 정보를 MS-SQL, MySql, Oracle 등의 서버측의 데이터베이스에 의존하였다. 앞선 방법들을 분석하고, 서버의 부하를 줄이기 위하여 HTML5부터 지원하는 Web SQL Database를 이용하는 방법을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.843-845
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• 2007

본 논문은 저비용 센서네트워크를 이용하여 효율적으로 산불을 감시할 수 있는 시스템설계 방법을 제안한다. 제안된 산불감시시스템은 기존의 문제점들을 보안하여 정확한 산불 감지를 위해 여러 센서들을 사용하고, 추가적으로 정확성을 의해 카메라모듈을 이용하여 산불을 감지한다. 따라서 본 논문은 산불감시를 위한 센서의 선택방법과 저전력을 고려하여 센서노드와 카메라모듈의 설계방안을 제시한다. 마지막으로 산불감시시스템의 효율적인 데이터 전달을 위한 프로토콜을 제안한다.

• Journal of Appropriate Technology
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• v.7 no.2
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• pp.196-205
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• 2021

As industrial safety increases, various industrial accident prevention technologies using smart factory technology are being studied. However, small and medium enterprises (SMEs), which account for the majority of industrial accidents, are having difficulties in preventing industrial accidents by applying these smart factory technologies due to practical problems. In this study, customized monitoring and warning systems for each type of industrial accident were developed and applied to the actual field. Through this, we demonstrated industrial accident prevention technology through appropriate smart factory technology used by SMEs. A customized monitoring system using vision, current, temperature, and gas sensors was established for the four major disaster types: worker body access, short circuit and overcurrent, fire and burns due to high temperature, and emission of hazardous gas. In addition, a notification method suitable for each work environment was applied so that the monitored risk factors could be recognized quickly, and real-time data transmission and display enabled workers and managers to understand the disaster risk effectively. Through the application and demonstration of these appropriate smart factory technologies, the spread of these industrial safety technologies is to be discussed.

• Journal of Korean Society for Atmospheric Environment
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• v.23 no.1
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• pp.97-109
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• 2007

Vertical distribution and optical properties of atmospheric aerosols above the Korean peninsula are quite important to estimate effects of aerosol on atmospheric environment and regional radiative forcing. For the first time in Korea, vertical microphysical properties of atmospheric aerosol obtained by inversion algorithm were analyzed based on optical data of multi-wavelength Raman lidar system developed by the Advanced Environmental Monitoring Research Center (ADEMRC), Gwangju Institute Science and Technology (GIST). Data collected on 14 June 2004 at Gwangju ($35.10^{\circ}N,\;126.53^{\circ}E$) and 27 May 2005 at Anmyeon island ($36.32^{\circ}N,\;126.19^{\circ}E$) were used as raw optical data for inversion algorithm. Siberian forest fire smoke and local originated haze were observed above and within the height of PBL, respectively on 14 June 2004 according to NOAA/Hysplit backstrajectory analysis. The inversion of lidar optical data resulted in particle effective radii around $0.31{\sim}0.33{\mu}m$, single scattering albedo between $0.964{\sim}0.977$ at 532 nm in PBL and effective radii of $0.27{\mu}m$ and single scattering albedo between $0.923{\sim}0.924$ above PBL. In the case on 27 May 2005, biomass burning from east China was a main source of aerosol plume. The inversion results of the data on 27 May 2005 were found to be particle effective radii between $0.23{\sim}0.24{\mu}m$, single scattering albedo around $0.924{\sim}0.929$ at 532 nm. Additionally, the inversion values were well matched with those of Sun/sky radiometer in measurement period.

• Proceedings of the Korean Geotechical Society Conference
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• 2006.03a
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• pp.1100-1109
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• 2006

In this study, two different technologies which can measure temperature simultaneously at many points are introduced. One is to use a thermal sensor cable that is comprised of addressable thermal sensors connected in parallel within a single cable. The other is to use an optic fiber with Distributed Temperature Sensing (DTS) system. The difference between two technologies can be summarized as follows. A thermal sensor cable has a concept of 'point sensing' that can measure temperature at accurate position of a thermal sensor. So the accuracy and resolution of temperature measurement are up to the ability of the thermal sensor. Whereas optic fiber sensor has a concept of 'distributed sensing' because temperature is measured by ratio of Stokes and anti-Stokes component intensities of Raman backscatter that is generated when laser pulse travels along an optic fiber. It's resolution is determined by measuring distance, measuring time and spatial resolution. The purpose of this study is that application targets of two temperature measurement techniques are checked in technical and economical phases by examining the strength and weakness of them. Considering the functions and characteristics of two techniques, the thermal sensor cable will be suitable to apply to the assessment of groundwater flow, geothermal distribution and grouting efficiency within 300m distance. It is expected that the optic fiber sensor can be widely utilized at various fields (for example: pipe line inspection, tunnel fire detection, power line monitoring etc.) which need an information of temperature distribution over relatively long distance.