• Journal of Energy Engineering
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• v.3 no.2
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• pp.167-171
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• 1994

대용량 발전용 보일러내 화염의 정량적 관리를 위해서 기존의 화염감시 카메라에 영상처리 기법을 적용한 화염감시 시스템을 개발하였다. 화염감시 시스템은 화상의 저장, 재생, 비교 및 색채화의 기능을 통해 화염의 분포를 가시적으로 확인하고 변화를 판단하는 기능을 가지고 있다. 이 시스템을 S 화력에 대해 시험적용하였으며 현재 확대적용 가능성을 확인하고 있다.

• Information and Communications Magazine
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• v.14 no.6
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• pp.109-122
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• 1997

본 고에서는 통과 대역 DMT ADSL 시스템의 등화기 구조를 설계하고 이를 포함하는 DMT ADSL 시스템 성능 모델을 제시하였다. CSA 지역에서 다중 반송파 변조 방식(multicarrier modulation)을 전송방식으로 하는 6Mb/s급의 ADSL 서비스를 위하여 가입자 루프 및 전송신호 특성을 고려한 노이즈 모델을 고찰하고 DMT ADSL 시스템에서 성능예측을 위한 시뮬레이션 모델을 제시하였다. 그리고 기존에 설치되어 있는 일반 전화선(unshilided twisted pair copper wire)를 이용하여 ATM 환경에서 가입자에게 주문형 비디오(video on demand) 서비스, 화상전화회의 서비스, 고속 인터넷 접속 서비스를 제공하기 위한 서비스 망 구조를 제시하였다.

• Proceedings of the Optical Society of Korea Conference
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• 1995.06a
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• pp.201-209
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• 1995

광의 초고속성의 본질을 이용한 시간다중 공간분할 광교환 시스템이 처음으로 구현되었다. 단순한 공간분할 광교환방식에 비해 뛰어난 확장성과 간단한 하드웨어로 화상 및 음성신호의 지점대 지점간의 교환 및 멀티 캐스팅의 서비스가 가능하다. 스위칭 사간, 수용 가입자 수, 동기분제, 손실과 광출력의 분배, 광압축 등을 통하여 본 시스템의 특성을 분석해 본다.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.22 no.49
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• pp.135-142
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• 1999

The objective of this paper is to provide an automatic color image testing system capable of synthetically testing a color element like a color tone and a luminance for a color image displayed on the screen, using a CCD camera and a microprocess. The system consists of a CCD camera, a line conveyor, a camera driving part, a remocon, a remote sensing part, a display and a PC including a color vision board and a CPU board. By applying the system to a process, reliability for a testing result can be improved and the absolute criterion to judge a part can be made.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.49-50
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• 2021

최근 얼굴인식 시장의 규모가 증가하고 있으며 모바일 결제, 디바이스 본인인증, 신분확인 및 출입 통제, 치안 등의 다양한 분야에 적용 되고 있다. 온라인 화상회의에서 출석하는데 번거로운 방식들이 사용되고 있으며 대규모 회의일 경우 인원파악에 어려움을 겪고 있다. 본 논문에서는 온라인 회의를 할 때 머신러닝을 이용하여 여러 수강자의 얼굴을 자동으로 인식하여 출석을 확인하는 출석시스템을 제안한다. 이후 사용자는 출석 시스템을 사용해 객관적인 데이터를 확보하게 된다.

• Journal of the Korean Wood Science and Technology
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• v.29 no.2
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• pp.91-99
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• 2001

In this study the possibility of classifying wood surface defects by image processing technique was investigated. An algorithm for the classification of wood surface defects, such as knot, check, and bark, on three Korean domestic species, Pinus densiflora, Quercus acutissima, and Carpinus laxiflora was also developed. Filtering was executed to separate dummies from the labels including real defect. Error rates in classifying knots on Pinus densiflora and Quercus acutissima were lower than 1% and error rates. In classifying check and bark in Quercus acutissima and Carpinus laxiflora could be lowered to below 13%.

• Journal of the Korean Society for Nondestructive Testing
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• v.30 no.2
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• pp.85-90
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• 2010

The infrared energy is emitted in the infrared wavelength range that corresponds to the surface temperature of a object which has temperature that is over the absolute the temperature(OK). The infrared thermography (IRT) is a non-destrnctive testing method that provides thermal video for the user in real-time by converting the infrared quantity that is detected by the infrared detector into temperature. The pipes of nuclear power plant(NPP) could be thinned by the corrosion and fatigue and the defect could lead to a big accident. For this reason, the effective non-destructive testing method is necessary. In this study, the relationship between the measured temperature and the defect depth or size of NPP pipes were recognized and that was applied to detect the wall thinning defects of NPP pipes.

• Fashion & Textile Research Journal
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• v.15 no.6
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• pp.1010-1017
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• 2013

Current global textiles and fashion industries have gradually shifted focus to high value-added, high sensibility, and multi-functional products based on new human-friendliness and sustainable growth technologies. Textile design CAD systems have been developed in conjunction with computer hardware and software sector advances. This study compares the patterns or images of actual woven fabrics and virtual fabrics prepared with a textile design CAD system. In this study, several weave structures (such as fancy yarn weave and patterns) were prepared with a shuttle loom. The woven textile images were taken using a CCD camera. The same weave structure data and yarn data were fed into a textile design CAD system in order to simulate fabric images as similarly as possible. Similarity Index analysis methods allowed for an analysis of the index between the actual fabric specimen and the simulated image of the corresponding fabric. The results showed that repeated small pattern weaves provide superior similarity index values than those of a fancy yarn weave that indicate some irregularities due to fancy yarn attributes. A Complex Wavelet Structural Similarity(CW-SSIM) index resulted in a better index than other methods such as Multi-Scale(MS) SSIM, and Feature Similarity(FS) SSIM, across fabric specimen images. A correlation analysis of the similarity index based on an image analysis and a similarity evaluation by panel members was also implemented.

• Journal of the Korean Society for information Management
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• v.23 no.3 s.61
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• pp.5-21
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• 2006

In recent years, theories of image and sound analysis have been proposed to work with text retrieval systems and have progressed quickly with the rapid progress in data processing speeds. This study proposes a common representation format for multimedia documents (CRFMD) composed of both images and text to form a single data structure. It also shows that image classification of a given test set is dramatically improved when text features are encoded together with image features. CRFMD might be applicable to other areas of multimedia document retrieval and processing, such as medical image retrieval, World Wide Web searching, and museum collection retrieval.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.48 no.2
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• pp.11-23
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• 2011

In this paper, an accurate and fully automatic video object segmentation method is proposed for video conferencing systems in which the real-time performance is required. The proposed method consists of two steps: 1) accurate object extraction on the initial frame, 2) real-time object extraction from the next frame using the result of the first step. Object extraction on the initial frame starts with generating a cumulative edge map obtained from frame differences in the beginning. This is because we can estimate the initial shape of the foreground object from the cumulative motion. This estimated shape is used to assign the seeds for both object and background, which are needed for Graph-Cut segmentation. Once the foreground object is extracted by Graph-Cut segmentation, real-time object extraction is conducted using the extracted object and the double edge map obtained from the difference between two successive frames. Experimental results show that the proposed method is suitable for real-time processing even in VGA resolution videos contrary to previous methods, being a useful tool for immersive video conferencing systems.