• 스마트미디어저널
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• 제5권1호
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• pp.88-94
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• 2016

본 논문에서는 희소성 표현을 기반으로 하는 객체 추적 방법에 있어서 객체 표류 현상을 처리하기 위한 새로운 방법을 제시한다. 그중에서도 APG-L1 (accelerated proximal gradient L1) 방법은 희소성 표현이란 객체의 외형을 표현하기 위한 목표 템플릿(target template)과 배경이나 폐색(occlusion)과 같은 객체 이외의 부분을 대체하기 위한 기본 템플릿(trivial template)를 이용하여 입력 영상을 표현하는 방법이다. 또한 어파인 변환행렬을 이용한 particle filtering 이 적용되어 객체의 위치를 찾고 APG 방법을 사용하여 희소성기반의 L1-norm을 최소화한다. 본 논문에서는 객체추적의 표류현상을 방지하기 위하여 기본 템플릿의 계수를 활용하여 배경을 가진 객체가 채택되는 현상을 방지하는 방법을 제시한다. 다양한 영상에 적용하여 제안하는 방법을 실험한 결과, 기존의 방법들과 비교하여 높은 성과를 보인다.

• Journal of Mechanical Science and Technology
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• 제15권12호
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• pp.1757-1761
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• 2001

"Drifting cups on a meandering stream" is a same originating from the ancient China. It takes advantage of the stopover of the cup at the different positions on a meandering stream to choose a person sitting on the bank to participate the game. In this paper, a model is devised to make the cups move around or stop at some place on the stream as required by the game. A typical flow field Is abstracted and studied using the PIV technique and the topological analysis. Some motions of the cup on the stream have been explained in the mechanics theory.

• 해양환경안전학회지
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• 제3권1호
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• pp.85-92
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• 1997

To understand the dynamics of a drifting object, an analysis based on fluid dynamics theory is presented. A simplified analysis shows a consistency with the linear formula currently used for search and rescue mission. Also an experiment using miniatured human models has been conducted to study the drift characteristics of Person-in-Water. The tests were carried out at the water channel facility and the models were tested in different positions and styles. The measured drag coefficients for human body ranged over 0.4-1.2.

• Current Optics and Photonics
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• 제3권1호
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• pp.27-32
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• 2019

We present an autofocus tracking system implemented by the digital refocusing of digital holographic microscopy (DHM) and the tunability of an electrically tunable lens (ETL). Once the defocusing distance of an image is calculated with the DHM, then the focal plane of the imaging system is optically tuned so that it always gives a well-focused image regardless of the object location. The accuracy of the focus is evaluated by calculating the contrast of refocused images. The DHM is performed in an off-axis holographic configuration, and the ETL performs the focal plane tuning. With this proposed system, we can easily track down the object drifting along the depth direction without using any physical scanning. In addition, the proposed system can simultaneously obtain the digital hologram and the optical image by using the RGB channels of a color camera. In our experiment, the digital hologram is obtained by using the red channel and the optical image is obtained by the blue channel of the same camera at the same time. This technique is expected to find a good application in the long-term imaging of various floating cells.

• 한국항만학회지
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• 제14권3호
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• pp.353-360
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• 2000

In this study a drift prediction model based on fluid dynamics theory is introduced. The essential effects of environmental loads and target characteristics are taken into account from a fluid dynamics point of view. The governing equations of motion are derived from Netwon's law of dynamics. In the mathematical formulation only three degrees of freedom(surge, sway, yaw) of the drifting object are assumed and the environmental loads considered are the forces and moments by wind and current. A computer algorithm for this model is implemented to obtain the numerical result in the time domain. The preliminary tests for model verification are conducted and the results are compared with the field experiment data as well as leeway formula suggested from the field test data.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2000년도 추계학술대회논문집
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• pp.63-71
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• 2000

In this study a drift prediction model based on fluid dynamics theory is introduced. The essential effects of environmental loads and target characteristics are taken into account from a fluid dynamics point of view. The governing equations of motion are derived from Newton's law of dynamics. In the mathematical formulation only three degrees of freedom(surge, sway, yaw) of the drifting object are assumed and the environmental loads considered are the forces and moments by wind and current. A computer algorithm for this model is implemented to obtain the numerical result in the time domain. The preliminary tests for model verification are conducted and the results are compared with the field experiment data as well as leeway formula suggested from the field test data.

• 한국실내디자인학회논문집
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• 제23호
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• pp.92-99
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• 2000

From 1960 year, in Korea, for solving the cityward drifting of problem, A lot of apartment housings were intentionally constructed in the process of industrialization. After 30 years, for solving the stock problem of the deteriorated apartment housing, it has mostly been reconstructed, till now. In this paper, because we try to improve upon the method of the problem which is used n reconstruction, we propose $\ulcorner$Re-using system$\lrcorner$ of a deteriorated apartment housing. This includes all improving spheres of deterioration of faculty and sociality, which are all factors of discomfort and improving method after residents'living, individually and collectively. Accordingly, the object of this paper consequently propose the application of the methods of $\ulcorner$Re-modeling system$\lrcorner$ to all stocks of deteriorated apartment housings.

• 수산해양기술연구
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• 제35권3호
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• pp.243-249
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• 1999

Specificity of catches has been analyzed to japanese tuna purse seine A principle component analysis was used to improve the efficiency of fishing and increase sustainable production and productivity of Korean tuna purse seine.The result are as follows;From the principal component analysis of the fish catches, the first principal component(Z1) to promote principal component score was skipjack Kastsuwonus Pelamis, LINNAEUS and yellowfin tuna Thunnus Albacares, BONNATERRE (Small : smaller than 10kg) and proportion was 86.8% of total. The second principal component(Z2) to increase principal component score was yellowfin tuna (Large : larger than 10kg) and proportion was 9.5%.On the other hand, fish operating that have caught skipjack and yellowfin tuna (Small and Larger) was not so much. Fish catches for one species raised volume of the catches while catches for multi-species decreased it since principal composition score for one species and both species together has been increased.Fish school could be divided into three groups of schools each of which was associated with drift objects, payaho and ship, school associated with shark, whale and porpoise and school of breezing, feeding and jumping from proportion of principal component analysis for fish catches of school types. However, the biological pattern is different among school associated with ship, payaho and school associated with drift objects for analysis eigen vector. School associated with ship, payaho and school associated with drifting object associated is judged as school which be assembled to vessel and drifted log temporary.