• Proceedings of the Korean Society of Precision Engineering Conference
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• 2006.05a
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• pp.429-430
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• 2006

To estimate the fatigue life of flange-shaft assembly, fatigue test for flange material and bending fatigue test for flange-shaft assembly were conducted. Also, finite element analysis for flange-shaft assembly was conducted. Then, we have changed the obtained P-N curve to S-N curve using the finite element analysis results which were stress values at the location of fracture. The S-N curve of flange material itself was almost consistent with that of flange-shaft assembly, so it seems that the fatigue life of flange-shaft assembly could be estimated by using S-N curve for flange material and the stress at the location of fracture calculated by finite element methods.

• Journal of Life Science
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• v.10 no.6
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• pp.543-547
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• 2000

Quartz porphyry (QP) on the contents of mineral tissues of male common finch by feeding the basal diet (Control group) containing 3.0% QP (QP group) for 14 days was studied. The relative weight (mg/10 g body weight) of kidney and gizzard in the QP group were higher and lower than in the control group, respectively. However, the relative weight of liver and heart were not significantly different in the both groups. The mineral contents of liver, kidney, heart and gizzard were significantly higher in common finch fed with the diet containing quartz porphyry than that of control diet. The major minerals of these tissues were P, Ca and Fe.

• Journal of Life Science
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• v.9 no.5
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• pp.497-503
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• 1999

Change on the structural carbohydrate(several fiberous components) was determined by vegetables(crown daisy and butterbur)-cultivated in Ulsan, Kyungnam, Korea-as its stage of maturity developed. Samples were separated into leaf and stem, which were dried at 7$0^{\circ}C$ for 24hr, and ground to pass a 1mm screen. They were subjected to moisture, crude protein, crude fat and several dietary fiber-DF(dietary fiber, include unavaible components), NDF(neutral detergent fiber), ADF(acid detergent fiber), lignin, hemicellulose, cellulose and protein corrected NDF(c-NDF), IDF(indigestible fiber, include lignin, hemicellulose and cellulose). In general, structural carbohytrate(several dietary fiber) of vegetable was affected by the growth stage. In case of crown daisy and butterbur, dietary fiber in leaf was higher than DF in stem.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06b
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• pp.369-371
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• 2012

Shadow detection and elimination is a critical issue in vision-based system to improve the detection performance of moving objects. However, traditional algorithms are useless at night time because they used the chromaticity and brightness information from the color image sequence. To obtain the high detection performance, we can use the thermal camera and there are shadows by the heat not the light. We proposed a novel algorithm to detect and eliminate the shadows using the thermal intensity and the locality property. By combining two results of the intensity-based and locality-based, we can detect the shadows by the heat and improve the detection performance of moving object.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2012.07a
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• pp.188-191
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• 2012

단일 주파수 방송 시스템에서 이레이저 현상이 생길 경우 기존의 공간 다중화 기법은 큰 성능 저하가 발생한다. 이에 본 논문에서는 라이시안 이레이저 페이딩 채널 환경에서 기존의 $2{\times}2$ 공간 다중화 기법에 직교 선부호기를 직렬 연접한 공간 다중화 기법의 성능을 분석하고, 수신 SER 성능을 최대화하는 선부호기 최적화를 수행한다. 전산 실험 결과, Rician 이레이저 페이딩 채널 환경에서 최적의 선부호화 공간 다중화 기법은 수신단에서 성상 모호성을 줄여 기존의 공간 다중화 기법에 비하여 우수한 성능 향상을 보였다.

• The Journal of Korea Robotics Society
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• v.3 no.2
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• pp.117-122
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• 2008

This paper presents a multi-robot localization based on multidimensional scaling (MDS) in spite of the existence of incomplete and noisy data. While the traditional algorithms for MDS work on the full-rank distance matrix, there might be many missing data in the real world due to occlusions. Moreover, it has no considerations to dealing with the uncertainty due to noisy observations. We propose a robust MDS to handle both the incomplete and noisy data, which is applied to solve the multi-robot localization problem. To deal with the incomplete data, we use the Nystr$\ddot{o}$m approximation which approximates the full distance matrix. To deal with the uncertainty, we formulate a Bayesian framework for MDS which finds the posterior of coordinates of objects by means of statistical inference. We not only verify the performance of MDS-based multi-robot localization by computer simulations, but also implement a real world localization of multi-robot team. Using extensive empirical results, we show that the accuracy of the proposed method is almost similar to that of Monte Carlo Localization(MCL).

• Proceedings of the Korean Information Science Society Conference
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• 2007.10c
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• pp.409-414
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• 2007

Active Appearance Model is a well-known model that can represent a non-rigid object effectively. However, since it uses the fixed appearance model, the fitting results are often unsatisfactory when the imaging condition of the target image is different from that of training images. To alleviate this problem, incremental AAM was proposed which updates its appearance bases in an on-line manner. However, it cannot deal with the sudden changes of illumination. To overcome this, we propose a novel scheme to update the appearance bases. When a new person appears in the input image, we synthesize illuminated images of that person and update the appearance bases of AAM using it. Since we update the appearance bases using synthesized illuminated images in advance, the AAM can fit their model to a target image well when the illumination changes drastically. The experimental results show that our proposed algorithm improves the fitting performance over both the incremental AAM and the original AAM.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10c
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• pp.263-266
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• 2007

We introduce a vision-based hand gesture recognition fer understanding musical time and patterns without extra special devices. We suggest a simple and reliable vision-based hand gesture recognition having two features First, the motion-direction code is proposed, which is a quantized code for motion directions. Second, the conducting feature point (CFP) where the point of sudden motion changes is also proposed. The proposed hand gesture recognition system extracts the human hand region by segmenting the depth information generated by stereo matching of image sequences. And then, it follows the motion of the center of the gravity(COG) of the extracted hand region and generates the gesture features such as CFP and the direction-code finally, we obtain the current timing pattern of beat and tempo of the playing music. The experimental results on the test data set show that the musical time pattern and tempo recognition rate is over 86.42% for the motion histogram matching, and 79.75% fer the CFP tracking only.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10c
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• pp.419-423
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• 2007

감시 및 보안의 중요성이 커지고 있다. 따라서 여러 대의 카메라로 움직이는 물체를 연속적으로 추적하는 효율적인 알고리즘 및 시스템에 대한 개발이 활발하다. 본 논문에서는 물체를 연속적으로 추적하기 위해 다중 카메라 간의 hand-off 기술을 제안한다. 먼저 움직이는 물체의 검출을 위한 몇 가지 단계의 전처리 과정을 거친다. 그리고 나서 검출된 영역들 간의 상관관계를 파악하기 위해 물체를 가장 잘 검출 한 주 카메라를 선택하고 이동 경로에 따른 다음 주 카메라를 예측한다. 예측된 카메라 정보와 칼라 정보 등을 이용해서 동일 물체를 추적하고 있음을 확인한다. 실험 결과는 움직이는 특정 물체에 대해 주 카메라가 어떻게 변해 가는지를 보여준다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.11a
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• pp.96-98
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• 2011

최근 스마트폰을 비롯한 다양한 스마트 기기들의 사용이 폭발적으로 늘어남과 동시에 이 기기들에서의 멀티미디어 콘텐츠 소비 또한 급격하게 늘어나고 있다. 이것은 자연스레 홈 네트워크 환경에서 사용자들의 DLNA 기기 간 미디어 콘텐츠 공유에 대한 욕구로 이어졌다. DLNA 기술이 등장하면서 이러한 욕구가 해소되기는 했지만 DLNA 제품 간의 효과적인 콘텐츠 상호 공유 및 재생을 제어하고 관리하는 전용의 S/W가 요구되고 있다. 이에 본 논문에서는 DLNA와 UPnP의 분석을 통하여 미디어 공유와 제어를 동시에 수행하는 스마트 리모컨 S/W의 구현 구조에 대하여 논한다.