• 융합신호처리학회논문지
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• 제10권1호
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• pp.32-39
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• 2009

동화상의 부호화 효율향상을 위하여 유전적 알고리즘(Genetic Algorithm: GA)을 이용하여 영역 분할하는 방법을 제안한다. 유전적 알고리즘은 함수치만을 이용하여 큰 탐색공간으로부터 최적의 조합을 축차적으로 찾아내는 방법이다. 이동추정과 영역분할을 동시에 진행함으로써, 이동 벡터를 화면내의 작은 블록이나 화소의 각각에 할당하고, 그것을 부호화 정보량과 신호 대 잡음비의 관계로부터 최적화 문제로 변환할 수 있다. 즉, 이동보상예측 부호화에는 영역분할과 이동 추정은 서로 밀접하게 관계되어 있다. 이것은 부호량과 S/N비를 최적화하는 것으로서 화면 속의 각 블록에서 이동 벡타를 최적의 상태로 배치하는 것이다. 그러므로, 본 논문에서는 최적인 영역분할 결과를 얻기 위하여 GA의 데이터형과 그 데이터의 처리 방법에 대해서 검토하였다. 또한, 테스트 화상을 이용한 컴퓨터시뮬레이션을 통하여 제안 방법의 유효성을 확인하였다.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2006년도 PAN PACIFIC CONFERENCE vol.2
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• pp.227-230
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• 2006

The $St{\ddot{o}}ckigt$ sizing test of the most-commonly used sizing tests is easily influenced by the individual testers' bias in recognizing red coloration. Therefore the test had to be modified to improve its reliability and reproducibility by automated recognition of a coloration procedure during testing. In order to achieve this, all measured variables occurring during the $St{\ddot{o}}ckigt$ test was first be analyzed and then reflected in the new automatic system. Secondly, the most important principle applied was to transform the RGB values of the droplet image to hue (H), saturation (S) and value (V) respectively. This is because RGB cannot be used as a color standard, owing to RGB's peculiarity of being seriously affected by the observer's point of view. Therefore, the droplet color had to be separated into three distinct factors, namely the HSV values, in order to allow linear analysis of the droplet color. When the average values of the vectors calculated during color variation from yellow to brown were plotted against time, it was possible to determine the vector value of hue, the most sensitive factor among HSV, at the specific time by differentiation of a function when it exceeds the critical point. Then, the specific time consumed up to the critical point was regarded as the $St{\ddot{o}}ckigt$ sizing degree. The conventional method took more time to recognize an ending point of coloration than the automatic method, and in addition the error ranges of the conventional sizing degrees on the specific addition points of AKD were wider than those of the automatic method.

• 한국측량학회지
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• 제26권4호
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• pp.387-396
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• 2008

건설 CAD 자료와 GIS 자료를 연계하기 위해서는 임의의 좌표체계로 표현되거나 경우에 따라 좌표정보를 가지고 있지 않은 CAD 자료에 지도좌표를 부여하는 과정이 필요하다. 일반적으로 이러한 과정들은 수작업에 의하여 결정된 공액 꼭지점을 이용하지만 많은 시간이 소요되는 문제점을 가지고 있다. 본 연구는 VASM 알고리즘을 이용하여 건설 CAD 자료와 수치지도에서 건물 객체의 형상 정합을 수행함으로써 공액 꼭지점을 반자동 추출할 수 있는 기법을 제안한다. 이렇게 추출된 공액 꼭지점을 이용하여 상사변환에 기반한 지도좌표 부여 함수를 유도할 수 있었다. 본 연구에서 제안한 기법을 이용하여 지도좌표가 부여된 서울대학교 공과대학 건물들의 건설 CAD 도면을 수치지도에 중첩해보았고, 그 결과를 바탕으로 제안된 기법을 평가해 보았다.

• 대한원격탐사학회지
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• 제27권3호
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• pp.213-223
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• 2011

The purpose of this study is to estimate the spherical wave parameters that appears in synthetic aperture radar (SAR) image acquired over the coast of Chukk, Micronesia. The retrieval of ocean wave parameters consists of two main stages: the first is to determine the dominant wavelengths by Fast Fourier Transform (FFT) over 16 sub-image areas and the second is to estimate wave slopes and heights using dispersion relationship under various water wave conditions. It is assumed that the spherical waves are linear and progressive. These type of waves have the range and azimuth components traveling in radial directions. The azimuth travelling waves are more affected by the velocity bunching mechanism and it is difficult to estimate the wave parameters for these affected areas in SAR imagery. In order to compensate these effects, the velocity bunching ratio (VBR) based on modulation transfer function (MTF) was compared with the intensity ratio for neighbor area in the radial direction in order to assign the spherical wave properties for azimuthally travelling waves. Dispersion relation provides the good estimates for the wave heights for all the selected sub-image areas in the range of 1m to 2m. VBR based on MTF was found to be 0.78 at wave height of 1.36m, while the intensity-based VBR was 0.69 which corresponds to the height of 1.75m. It can be said that the velocity bunching accounts for azimuthally travelling spherical waves and the difference results from the sea-bottom effects.

• 물과 미래
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• 제14권3호
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• pp.55-66
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• 1981

The theory and practice of water quality scoring and indexing are introduced. The monthly water analysis data are available for six stations long the down-stream Han River whthin the areal boundary of the Special City of Seoul. The data cover the period between 1975 and 1979 inclusive and contain the analytical findings on 37 water constituents including DO, BOD, temperature, total solids and etc. Sic parameters are selected form the 37 items, that, to the judgement of the writer, best reflect the water quality of the Han River. They are; dissolved oxggen saturation, pH, fecal coliform, total solids, BOD and nitrate+ammonia. For each of the six parameters, a subscore function is developed and graphically presented to facilitate the transform of a measurment of the arameter to a subscore on a common score(e.G. 0-100) The score of a sample is calculated as a fuction of the six subscores, using four different approaches; (1) the unweighted arithmetic water quality score, (2) the weighted arithmetic water quality score, (3)the unweighted multiplicative score and (4) the reduced (total) score. Independent of these calculated scores, the experts' score which is calculated by averaging the ratings of water quality experts is obtained and compared with each of the four calculated scores by means of the least square method. The experts' score compares most favorably with the "reduced" score with the correlation coefficient of 0.956 : therefore this method of water quality scoring is adopted to calculate the Han River water quality scores and indices. Water quality index data for Guiri, ukdo, Pokwangdong, Noryangjin, Yongdungpo and Kayang Stations, 1975-1979 are as follow: The overall water quality index data of the Han River between Guiri and Kayang Stations are found; 47.3 in 1976, 48.0 in 1977, 48.5 in 1978 and 54.7 in 1979, indicating the general trend towards water quality improvent in this part of the river, in terms of the increased water quality index by average 1.85 points per year during this period. Finally the optimum sampling frequencies distributed among the six stations, using an equation which takes into account the coefficients of variation of the water quality scores and indices arec calculated.alculated.

• 패션비즈니스
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• 제5권2호
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• pp.35-48
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• 2001

The purpose of this research is to understand the importance and structure of underwear which is the closest cloth to the body. Scope of this research is from middle of 19th century to the beginning of 20th century. Firstly, I studied background of the times and change of women's status and duty. Secondly, I examined the outer garment closely by the ideal beauty of each period based on the study, and thirdly I looked into structure ways of underwear. Then lastly, I took a close look about the relation of outer garment and underwear, comparing with and researching both. I studied this research, focusing on corset, crinoline and bustle based on main characters such as reform and transform among several functions of underwear. The research results are such as follows. First of all, when women's social and economic status was subjected to men, women had worn corset and fashionable dresses even though there was many object movements and vices in women's garment. Secondly, according to those movements, the ideal beauty had changed little in the same sort emphasizing on breast and hip. Thirdly, structure method of underwear changed by ideal beauty and shape of outer garment. Due to increasing sports participation, improvement of women's position, achievement of practical use, women used more drawers and stopped wearing hoop. And the weight of underwear like combination and suspender attached to corset had decreased and advanced into the more practical way. Because of industrialization, function seemed to be granted by technology development, social position change of femininity.

• 대한공간정보학회지
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• 제1권2호
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• pp.167-175
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• 1993

본 연구에서는 교통모형의 기술적인 단점을 보완하기 위하여 교통모형과 지리정보시스템을 결합하는데 있어서 교통모형의 입력자료를 지리정보시스템의 위상구조에서 추출하여 교통모형의 단점을 극복해 보는데 있다. 또한, 그래픽 기능을 이용하여 교통모형의 결과치를 화면상에서 직접 보여줌으로서 의사결정과정에 효율적으로 대처할 수 있을 것으로 보인다. 이 시스템은 특정도시나 지역에 쓰여질 수 있고, 하드웨어 발달에 따른 컴퓨터 사용시간 및 자료 입력시의 오류의 절감과 지리정보시스템의 교통에로의 응용을 가능케 할 것이며, 여행자 정보시스템(ATIS: Advanced Traveler Information Systems)에 활용할 수 있는 주행안내시스템(Route Guidence System) 또는 차량항법시스템(Vehicle Navigation System)의 기초적 자료 및 시스템 개발에 기여할 것이다.

• 천문학논총
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• 제24권1호
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• pp.65-81
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• 2009

We present the performance test results of VLBI Correlation Subsystem (VCS) trial product which was being developed for 1 year from August 2007. It is a core component of Korea-Japan Joint VLBI Correlator (KJJVC). The aim for developing VCS trial product is to improve the performance of VCS main product to reduce the efforts and cost, and to solve the design problems by performing the preliminary test of the manufactured trial product. The function of VCS trial product is that it is able to process the 2 stations-1 baseline, 8 Gbps/station speed, 1.2 Gbps output speed with FX-type. VCS trial product consists of Read Data Control Board (RDC), Fourier Transform Board (FTB), and Correlation and Accumulation Board (CAB). Almost main functions are integrated in the FTB and CAB board. In order to confirm the performance of VCS trial product functions, the spectral analysis, delay compensation and correlation processing experiments were carried out by using simulation and real observation data. We found that the overflow problem of re-quantization after FFT processing was occurred in the delay compensation experiment. We confirmed that this problem was caused by valid bit-expression of the re-quantized data. To solve this problem, the novel method will be applied to VCS main product. The effectiveness of VCS trial product has been verified through the preliminary experimental results, but the overflow problem was occurred.

• 한국컴퓨터정보학회논문지
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• 제16권8호
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• pp.85-93
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• 2011

본 논문에서는 서울 목동에 운영 중인 PLC기반 통합원격검침시스템의 기능 요소별 역할을 분석하고 취약한 부분에 대해서는 개선 항목을 제시하였으며 수집된 에너지 사용량인 검침 데이터를 분석하여 사용자의 비정상적인 생활을 추정할 수 있는 방법을 연구하였다. 검침 데이터의 고주파 성분을 제거한 후 원본 그래프와 비교하여 변환 전의 데이터 그래프특성을 보유하고 있는지 확인하였다. 시험 결과 전체 주파수 대역이 포함된 원본 데이터 그래프에 비해서 저주파 대역만 선택하여 역변환 처리과정을 거친 그래프가 원본 데이터의 그래프 특성을 유지하면서 단순하고 매끄러운 곡선 형태를 가지고 있었다. 이 특성을 다르게 해석하면 변환 전 검침 데이터 특성 그래프는 시간영역의 순시유틸리티 사용량의 평균치 데이터로 비정상적인 소비상태를 결정하기에 부적합한 형태였지만, 주파수처리를 거친 신호는 유틸리티의 소비상태를 단순하면서 직관적인 판단이 가능한 형태를 가지고 있음을 확인할 수 있었다.

• 한국컴퓨터정보학회논문지
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• 제17권4호
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• pp.41-49
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• 2012

본 논문에서는 여러 가지 와이프 장면전환 중에서 이동 경계선의 형태가 선형 라인의 모양을 가지는 수평 와이프, 수직 와이프, 반도어(Barn Doors), 그리고 이동 경계선이 원의 모양을 가지는 아이리스 라운드(Iris Round) 와이프를 강건하게 검출하는 방법을 제안한다. 제안된 방법에서는 디지털 비디오 데이터를 입력 받아 차영상을 추출한 후 차영상에 허프변환을 적용하여 영상에 존재하는 라인과 원형의 이동 경계선을 강건하게 추출한다. 그런 다음, 평가함수를 통해 이들의 진행 방향과 형태를 효과적으로 분석하여 와이프의 발생 유무와 그 종류를 결정한다. 실험에서는 본 논문에서 제안된 와이프 검출 방법이 기존의 다른 방법에 비해 보다 정확하게 와이프를 검출한다는 것을 성능 비교를 통해 보여준다.