• Proceedings of the Optical Society of Korea Conference
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• 2003.02a
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• pp.324-325
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• 2003

광섬유 브래그 격자 센서(Fiber Brags Grating Sensor： FBG Sensor)는 여타 광섬유 센서와 같이 가볍고 저렴하며 주위의 전자기적 잡음에 무관한 장점과 더불어 측정대상이 반사광의 파장변화이므로, 광섬유 연결부나 실험장치들에 의해 생기는 광 손실이나 잡음에 대해서 강인한 측정을 할 수 있다. 그리고 파장변화가 변형률이나 온도변화에 선형적으로 나타나므로, 센서로서 많은 연구가 진행되고 있다. 특히, 구조물의 내부에 삽입하여 구조물 스스로 외부의 환경변화를 감지하여 필요한 동작을 수행하는 지능형 구조물(Smart Structure)에 적합한데, 이를 위해선 구조물의 여러 지점을 측정해야 하므로, 브래그 격자 여러개를 한 시스템에서 사용하는 다중화(Multiplexing)가 필수적이다. (중략)

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2020.11a
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• pp.159-160
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• 2020

카메라, 라이다, RTK-GNSS 등의 센서는 자율주행 YT 기술 개발을 위해 매우 주요한 요소이다. 본 연구에서는 항만 터미널의 무인화에 핵심 기술 중의 하나인 자율주행 YT에서 안전한 자율주행을 실현하기 위한 다중센서 기반의 융합인식 기술을 제안하고자 한다.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.38 no.8
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• pp.27-33
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• 2001

The performance of the ordinary Fiber Bragg Grating(FBG) sensor strain measurement system, which uses Fabry-Perot filter for scanning wavelength, has limitation for application because of hysteresis characteristics of PZT element in the filter, slow scan rate of the filter and the high cost of system. We proposed and experimented a multiple FBG sensor system using light emitting diode(LED) as a light source and adapting Code Division Multiplexing(CDM) method to separating out individual sensor signal. Output signals for a applied static and dynamic strain and crosstalk levels between sensor signals were measured. The price of the system is very loss and the response speed is very fast. Crosstalk levels between sensor signals below - 30 dB were demonstrated.

• Korean Journal of Remote Sensing
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• v.20 no.4
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• pp.275-288
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• 2004

This paper presents a fuzzy relaxation labeling approach incorporated to the fuzzy logic fusion scheme for the classification of multi-sensor remote sensing images. The fuzzy logic fusion and iterative relaxation labeling techniques are adopted to effectively integrate multi-sensor remote sensing images and to incorporate spatial neighboring information into spectral information for contextual classification, respectively. Especially, the iterative relaxation labeling approach can provide additional information that depicts spatial distributions of pixels updated by spatial information. Experimental results for supervised land-cover classification using optical and multi-frequency/polarization images indicate that the use of multi-sensor images and spatial information can improve the classification accuracy.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.10
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• pp.2358-2364
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• 2010

Recently, In the wireless sensor network, a study which guarantees integrity of not only data gathered from sensor node but also energy consumption of it is now going on. However, the existing study cannot guarantee data integrity and overhead of cluster head which merges data from sensor node. This paper proposes multi-path hash chain technique which guarantees integrity of merged data and reduces overhead of cluster head when cluster head merges with data transmitted from sensor node. The proposed technique forms multi-hash chain dividing main-path and assistance-path to guarantee data integrity of cluster head, when merges data. The assistance-path, which is used when main-path is not, supports integrity of sensor node while minimizing overhead of cluster head when sensor node is authenticate.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.7
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• pp.1202-1208
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• 2008

This paper represents the multiple sensor fusion algorithm for the deep-sea unmanned underwater vehicles (UUV), composed of a remotely operated vehicle (ROV) 'Hemire' and a depressor 'Henuvy'. The performance of underwater positioning system usually highly depend on that of acoustic sensors such as ultra short base line(USBL), long base line(LBL) and altimeter. A practical sensor fusion algorithm is proposed in the sense of a moving window concept. The performance of the proposed algorithm can be observed by applying the algorithm to the Hemire sea trial data which was measured at the East Sea.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.01a
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• pp.67-68
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• 2020

본 논문에서는 미세먼지 센서와 가스 센서를 이용한 효율적인 스마트 홈 기반 다중 센서 알림 시스템을 제안한다. 시스템은 여러 유형의 홈 센서를 이용하여 효율적으로 미세먼지와 실내의 가스를 탐지 후 실시간으로 애플리케이션을 통해서 사용자에게 탐지 결과를 알려주는 시스템이다. 본 시스템의 경우 기존에 존재하는 미세먼지 센서와 가스 센서를 적용한 측정 시스템에 비해 소액으로 최적의 시스템을 구축할 수 있다. 시스템은 기존의 가스 센서와 다르게 한 번에 다양한 종류의 가스를 탐지해 사용자에게 여러 정보를 제공할 수 있도록 개발하였다.

• The Journal of the Korea Contents Association
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• v.8 no.1
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• pp.177-185
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• 2008

Research on media access control (MAC) scheme for Wireless Sensor Network (WSN) has been mainly focused on energy efficiency improvement, while interest on latency is relatively weak. However, end-to-end latency could be a critical limitation specifically in the multi-hop network such as wireless multimedia sensor networks. In this paper we propose a media access control scheme with distributed transmission power control to Improve end-to-end transmission latency as well as reduce power consumption in multi-hop wireless sensor networks. According to the simulation results, the proposed scheme is turned out to be an energy efficient scheme with improved end-to-end transmission latency.

• Journal of the Korean Association of Geographic Information Studies
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• v.8 no.1
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• pp.88-95
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• 2005

Direct Georeferencing by combined multi-sensor based on the direct measurement of the projection centers and rotation angle of sensor through loading the GPS and INS in aircraft. The method of combined multi-sensor can offer us to acquire the exterior orientation parameters with only minimum GCPs, even the ground control process could be completely skipped. Consequently, It is possible extreme to reduce the time and expense for the mapping process. In this study, a CCD camera is simultaneously used in combined multi-sensor surveying, and acquired CCD image through Direct Georeferencing produce digital orthoimage. In this process, methods of combining sensor and digital orthoimage are examined and estimated. For the comparison of the positioning accuracy digital orthoimage through Direct Georeferencing, GCPs determined by GPS surveying are used. Two digital orthoimage are produced; one with a few GCP and the other without them. The accuracy of orthoimages produced through combined multi-sensor with GCPs meets that of 1:1,000 maps. Without GCPs, it meets that of 1:5,000 maps.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2006.06a
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• pp.423-426
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• 2006

홈서비스를 위한 지그비 센서 네트워크는 특정 대상이나 환경으로부터 데이터를 수집하여 그 데이터를 정보 분석이나 서비스 결정 수단으로 이용하기 때문에 데이터수집 과정에서의 효과적인 보안이 요구되어 진다. 지그비 센서 네트워크에의 공격은 정상적인 홈서비스를 방해하여 사용자의 불편을 초래할 수 있다. 이 중 다중신원을 가지는 공격자 노드의 침입은 비정상적인 정보 수집을 초래하여 서비스에서의 잘못된 결정을 유발할 수 있다. 이 다중신원노드의 탐지를 위해 본 논문에서는 DMIN(Detection of Multiple ID Node)이란 기법을 제안한다. 이 기법은 일처리 능력이 제한되어 있는 하나의 센서노드가 여러 신원의 역할을 수행할 때에 생기는 지연시간을 이용하며 이 기법을 이용하여 네트워크의 다중신원노드를 탐지한다.