• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.32 no.5
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• pp.50-57
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• 2004

For the application of structural health monitoring such as AE detection, a stabilized FBG sensor system with wide dynamic range was proposed. A tunable Fabry-Perot filter with narrow free spectral range(FSR) was used to simplify the multiplexing demodulator for FBG vibration sensors. Stabilization controlling system was also developed for the maintenance of maximum sensitivity of the sensors. In order to verify the performance of the proposed FBG vibration sensor system, we measured sensitivity, and the system showed the average sensitivity of 256 $n{\in}_{mas}/{\sqrt{Hz}}$. Finally, multi-points vibration tests using in-line FBG sensors were conducted to validate the multiplexing performance of the FBG system.

• JOURNAL OF ELECTRICAL WORLD
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• s.282
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• pp.67-71
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• 2000

일본, 유럽 및 미국 등의 선진국에서는 전력인프라가 거의 정비되어, 새로운 전력설비에 대한 투자보다 설비의 유지 보수$\cdot$점검비용의 비율이 더 커져가고 있다. 이러한 환경 하에 정기적인 유지보수$\cdot$점검에 요하는 비용, 사고시의 복구에 소요되는 비용 및 정전으로 인한 손실 등을 포함하여 라이프사이클 코스트의 최적화가 논의되고 있다. 유지보수$\cdot$점검에 대하여는 종래의 정기적인 유지보수(Time Based Maintenance : TBM)에서 상태대응 유지보수(Condition Based Maintenance : CBM)에로의 이행으로 비용을 삭감하려는 시도도 진전되고 있다. 이 때문에 전력설비의 상태를 파악할 수 있는 적절한 센서의 설치와 저가격의 가반형 센서의 도입도 추진되고 있다. 또한 설비의 진단장치를 차에 실은 이동진단차의 도입도 시작되고 있어, 복수의 전력소를 순회하며 효율 좋은 유지보수$\cdot$점검을 할 수 있게 되었다. EH 변전소의 무인화에 따라 정전시간 단축을 위해 사고 시에 원방복구조작이 가능한 고장점 표정장치도 도입되고 있다. 최근에는 SF${_6}$가스의 환경문제도 화제가 되어 가스를 대기 중에 방출하는 일 없이 고장구분을 표정할 수 있는 분해가스센서도 개발되었다.

• Journal of Sensor Science and Technology
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• v.9 no.1
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• pp.61-69
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• 2000

In this paper, an algorithm was developed to construct a vision sensor system that can detect abnormal region under ever changing outdoor environment. The algorithm was implemented on parallel network system consist of multi-processors according as it's properties to enlarge it's features. From experiments using real scenes, the algorithm was adaptive to ever changing outdoor environmental conditions and it was confirmed that the system is robust and effective.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.2
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• pp.86-91
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• 2010

We constructed a quasi-distributed fiber-optic sensor network for the safety monitoring in power systems. It is possible to construct many of FBG sensors in a line and to be immune from electromagnetic noise. For demodulation analysis of reflected wavelength from FBG sensor, we proposed a simple and fast system using a InGaAs photo-diode array and a holographic diffraction grating. For accuracy improvement of the proposed demodulation system, we applied a Gaussian line-fitting algorithm. We obtained about 4[pm] of wavelength resolution and stability.

• Journal of Korea Multimedia Society
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• v.16 no.10
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• pp.1196-1203
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• 2013

In general, the cost of transceiver for wireless network configuration is more expensive than that for wired network. However, in case of environmental management system in a tunnel, the cost can be minimized by adopting low rate tranceiver because the amount of the exchanged data for tunnel monitoring is very small. When the obtained data from sensor node is sent directly to the corresponding command node, there is no need to consider routing problem of the data transfer. However in this case, sensor nodes are required to be implemented with high power transmitter and experience high energy consumption. To tackle this problem, relay nodes can be used to transfer the data of tunnel monitoring, and suitable routing protocols for selecting optimum path are needed. Therefore, in this paper, we propose a routing algorithm and a self-configuration protocol for environment management system in tunnel.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.2501-2503
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• 2005

탐침형 정보 저장 장치는 원자 현미경의 원리를 이용한 차세대 고밀도 저장장치로 여겨진다. 정보의 크기가 수십 나노미터 이하이므로 정밀한 위치 제어 알고리즘이 필수적이다. 본 논문에서는 별도의 위치 센서없이 복수개인 탐침을 이용하여 원하는 데이터 위치로 이동하는 servo algorithm, 정보 추종을 위한 tracking algorithm 및 위치 검출용 탐침의 수를 줄이고 최적 제어기 설계를 위한 노이즈 특성 안정화를 위한 servo code 설계법을 제안하고 제어기 설계법을 제안한다.

• Journal of the HCI Society of Korea
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• v.3 no.2
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• pp.1-8
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• 2008

We introduce VRSMS(VR-based sensor management system) which is the visualization system of micro-scale air quality monitoring system Airscope[3]. By adopting VR-based visualization method, casual users can get insight of air quality data intuitively. Users can also manipulate sensors in VR space to get specific data they needed. For adaptive visualization, we separated visualization and interaction methods from air quality data. By separation, we can get consistent way for data access so new visualization and interaction methods are easily attached. As one of the adaptive visualization method, we constructed large display system which consists of several small displays. This system can provide accessibility for air quality data to people one public space.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.3
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• pp.247-253
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• 2019

In this paper, we present a new method for real-time tracking of human walking around a laser sensor system. The method converts range data with $r-{\theta}$ coordinates to a 2D image with x-y coordinates. Then human tracking is performed using human's features, i.e. appearances of human walking pattern, and the input range data. The laser sensor based human tracking method has the advantage of simplicity over conventional methods which extract human face in the vision data. In our method, the problem of estimating 2D positions and orientations of two walking human's ankle level is formulated based on a moving trajectory algorithm. In addition, the proposed tracking system employs a HMM to robustly track human in case of occlusions. Experimental results using a real system demonstrate usefulness of the proposed method.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.11
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• pp.2480-2487
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• 2011

As sensor technology grows up in fields such as environmental hazards detecting system, ubiquitous sensor network, intelligent robot, the sensing and detecting system for sensor is increasing. The sensor data is measured by change of chemical and physical status. Because of decrepit sensor or various sensing environment, it is problem that sensor data is inaccurate result. So the reliability of sensor data is essential. In this paper, we proposes a reliable sensor signal processing platform for various sensor. To improve reliability, we use same sensors in multiple array structure. As sensor data is corrected by spatial and temporal relation signal processing algorithm for measured sensor data, reliability of sensor data can be improved. The exclusive protocol between platform components is designed in order to verify sensor data and sensor state in various environment.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.07a
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• pp.262-263
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• 2015

본 논문에서는 마이크로소프트 키넥트 센서를 이용한 실시간 성능의 3차원 환경 복원 알고리즘을 소개한다. 기존의 멀티키넥트 시스템을 확장하여 총 열두대의 키넥트를 사용하는데, 키넥트의 높은 대역폭 문제를 해결하기 위하여 키넥트가 여섯 대씩 연결된 두 대의 데스크탑을 UDP 통신으로 연결하였고, 각 키넥트로부터 들어오는 3차원 포인트클라우드로부터 확률적인 3차원 환경복원을 하기 위하여 옥토맵 알고리즘을 차용하였다. 또한, GPU를 연산에 활용함으로써 실시간 성능을 확보하였다.