남북한 경제통합의 과제

권기홍 영남대학교 통일문제연구소 1996 統一問題硏究 Vol.18 No.-

영상신호의 잡음제거에 대한 필터의 비교와 분석

權起弘 대구산업정보대학 1997 논문집 Vol.11 No.2

This paper restored the original image, by mean filter, median filter, NAGAO filter, LEE filter, and CSW filter after mixing GIRL.IMG with the white Gausian noise at 20dB, and characterized the results by the filterings, graphs and MSE results. Therefore, the results of restorering images were improved. This paper used the median filter in order to resolve the problems of mean filtering and improved the images. This paper introduced NAGAO, and CSW to restore detailed noises by using directional iterate filters, and used LEE filter for restoring closely the original images without priori-information.

Lee Filtering에 대한 분석과 연구

權起弘 대구산업정보대학 1996 논문집 Vol.10 No.2

The purpose of this paper is to introduce for method of the restoration of an image degraded by White Gaussian noise. This method is Lee filtering, that presented used to local variance and local mean to preseving edge as adjusted to contrast of each pixel. Lee algorithm is advantaged of removed in flat well and preserving edge. but, edge area is disadvantaged of not removed noise well area of edge of this part represented origin of value pixel observed.

시각 특성을 고려한 2차원 신호의 최적화 알고리즘에 관한 연구

權起弘 대구산업정보대학 1995 논문집 Vol.9 No.2

This paper describes iterative restoration method of restoring blurred images using the LOG compansion function and Steepest-Descent method. Conventional restoration methods results satisfy the requirement performance for restoring blurred images. but iteration number and convergence velocity increase. This paper proposed an opmtimised iterationrestoration method for the images degraded by blurring effect, using the LOG compansion function and Steepest-Descent method. Here, the LOG compansion function used to improve local properties of the image being restored, made the visual character and convergence velocity of the estored image improved. Through the simulation results, The author showed that proposed algorithm produced superior performance results by conventional methods.

발생원별 산업폐기물의 물리화학적 특성

권기홍 경산대학교(대구한의과대학) 1998 環境硏究 Vol.3 No.1

This study was carried out to evaluate the quantity of industrial waste generated in Korea and the physico-chemical characteristics with generative dewatered sludges at wastewater treatment process of 6 different industry types. Sludge generation rate according to the industrial types was 2,148ton/yrear at chemical plant industry, 720ton/year at textile industry, 588ton/year at coke· petroleum industry and 480ton/year at 1st metal industry, respectively. Moisture of sudges were 81.5% in textile industry, 81.4% in frame metal industry, 80.7% in 1st metal industry, Volatile solid were 22.1% in hide · rubber industry, 21.9% in coke·petroleum industry. Fixed solid were 18.5% and 17.7% in the 1st metal industry and frame metal industry. High heating value by wet base were 1,850kca1/kg-wet waste in coke·petroleum industry, 1,220 kcal/kg-wet waste in hide·rubber industry, but the 1st metal industry and frame metal industry's sludge were impossible to incinerate because it was mostly inorganic sludge. In comparison with the Korean extraction limit, some of discharged sludge at hide·rubber. chemical, frame metal industry exceeded the limit and was classified as the specific waste. And in other industries it was lower than the limit.

병원폐기물중 폐합성수지류의 물성 및 세척·선별에 관한 기초연구 : 폐주사기와 폐수액세트를 중심으로

권기홍,성병주,박종웅 慶山大學校 環境시스템開發硏究所 1999 環境硏究 Vol.4 No.1

This research was carried out basic study to effective manage and develop washing-separator system for plastics in hospital wastes. The results are as follows : In 1995, the generation rate of plastics in hospital waste was 6,666ton in total amount of 11,195ton. Most of syringe was PP and the composition of drainage set was PP, PVC and ABS. Therefore, separation of syringe is better than that of drainage set. Pathoganic microbes in syringe was positive before sterilization process, but became negative after that process, Pollution of syringe-washing water was increased as washing times increased and optimum washing to obtain good pellet was 6 times. Separation efficiency differed with content of injected rubber in the manufactory process of syringe makers. Remaining rubber in pellet was completely removed by the final separator developed during the this project, so we obtained good PP pellet.

단진자에 작용하는 장력의 유도

권기홍 대전대학교 기초과학연구소 1996 自然科學 Vol.7 No.2

진자에 작용하는 장력과 순 힘을 진자의 위치를 나타내는 각도 θ와 초기 각도 θo의 함수로 구하였다. The tension and net force acting on the pendulum bob are derived in terms of the angle θ and the initial angle θo.

영상신호의 노이즈감소 기능 향상을 위한 제안된 Nagao Filter 구현

권기홍,Kwon, Kee-Hong 한국컴퓨터산업학회 2007 컴퓨터産業敎育學會論文誌 Vol.8 No.2

본 논문은 통신중 발생 할 수 있는 잡음(Noise)이 영상정보에 주는 영향을 확인하고 그것을 가능한 한 원본영상정보에 가깝게 잡음을 제거 할 수 있는 Nagao필터를 분석하고 기존의 Nagao필터보다 더 나은 성능을 위하여 다른 분할영역을 설정하여 MSE(Mean Square Error)를 줄일 수 있는 필터를 제안하고 모의실험과 그 결과를 통하여 이 방법의 우수성을 확인한다. The dissertation which it sees in communication the noise . it will be able to occur confirms the effect which it gives to this videotex and it the Nagao filter it will be able to reduce a noise in one original videotex which is possible and nearly it analyzes the Nagao filter of existing compared to compared to a different divided territory and for the efficiency which restores it sets the filter which is the possibility of reducing the MSE (Mean Square Error) it proposes simulation and the result it leads and the superiority of this method it confirms.

The SUSAN Filter Algorithm을 이용한 훼손영상복원

권기홍 대구산업정보대학 2000 논문집 Vol.14 No.2

The paper begins with an explanation of the SUSAN feature detection principle, and continues with details of the applications of it, including reviews of relevant past research and results of testing the applications. Because the research is based on fundamentally non-linear filtering, the approach to theoretical justification is necessarily different from that traditionally applied, for example, to "optimal" edge filtering.

LOG함수의 특성을 이용한 영상잡음제거(1)

권기홍,Kwon, Kee-Hong 한국컴퓨터산업학회 2005 컴퓨터産業敎育學會論文誌 Vol.6 No.3

국부 반복 복원 처리는 영상 전체를 반복 복원하는 기존의 반복 복원과는 달리, 영상을 국부적으로 구분하여, 변화량이 큰 부분은 기존의 반복 복원으로 처리하고 변화량이 적은 부분은 LOG함수의 특성을 이용하여 신장 시킨 다음 처리하고, 다시 압축시키므로, 기존의 반복 복원 처리보다도 MSE(Mean Square Error)를 월등히 줄일 수 있을 뿐 아니라 변화량이 적은 부분도 처리가 잘되고, 또 기존의 반복처리 방법이 갖는, 적은 메모리 용량의 소요, 비선형 제약조건의 사용 가능, 약간의 변형으로 언제나 수렴성을 보장하는 등의 장점을 모두 가진다. 이 방법을 영상에 적용시킨 결과, MSE의 현저한 감소, 반복횟수 감소에 따른 반복시간 단축을 확인 할 수 있었다. 그러므로, 이 방법은 MSE를 줄이고 또한 처리 시간 단축을 목적으로 하는 영상의 복원에 적용될 수 있는 매우 우수한 방법임을 알 수 있다. This paper describes iterative restoration method of restoring blurred images using the LOG compansion function and Conjugate Gradient method. Conventional restoration methods results satisfy the requirement performance for restoring blurred images. but iteration number and convergence velocity increase. This paper proposed an opmtimised iteration restoration method for the images degraded by blurring effect, using the LOG compansion function and Conjugate Gradient method. Here, the LOG compansion function used to improve local properties of the image being restored, made the visual character and convergence velocity of the restored image improved. Throught the simulation results, the author showed that proposed algorithm produced superior performance results by conventional methods.