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선형 Filter와 비선형 Filter 조합에 의한 화상복원
李泰鴻 嶺南大學校 工業技術硏究所 1986 연구보고 Vol.14 No.1
In the image restoration, the smoothing filter to reduce the effect of white Gaussian noise can be used. For the image of lower noise it acts well. But for the higher noise iterative smoothing is needed. Each time an iteration is processed, some area shows better result, while the others worse. Linear filter usually blurrs the edge portion, but it shows better effect for the flat plateau or back ground. Nonlinear filter shows excellent effect for preserving edges. Severe noise makes the both filters helpless. Iteration is needed in that case. The iterated linear filter makes the edge blurred excessively, while the iterated nonlinear filter makes streaks in line because of the propagated error. Combinations of both types of filter will have superior performance to that of filter used separately.
모니터 커버 설계를 위한 최적의 사출 위치 선정에 관한 연구
이태홍,이성수 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-
The object is design an optimal injection position on the Monitor Cover. In this paper, the defined injection position are three types, which simulate in melting temperature, molding temperature and weld line in variation. We obtained a result from simulation and descried the result related injection pressure with injection position.
휘발성 데이타 메모리의 불휘발성 프로그램 메모리化에 관한 一方案
李泰鴻 嶺南大學校 工業技術硏究所 1982 연구보고 Vol.10 No.2
A simple and general purposed nonvolatile read-write-memory system applicable to any circuit in place of EAROM, which is very complicated and difficult to use because of its diverse voltages, timing and control signals, is suggested in this paper. Using CMOS RAM and rechargeable battery back up, we can modify easily the data table or even the program memory in circuit without extracting memory devices. It is convenient for the equipments containing time variant parameters or data in its program. It is also examined how long the data can be retained when the back up supply recharged for once. Since this system recharges the back up supply whenever the main voltage source is used, the retention of data is almost everlasting.
이태홍 嶺南大學校 工業技術硏究所 1992 연구보고 Vol.20 No.1
An iterative image restoration is introduced that processes with varying iteration numbers according to the variance of the neighborhood pixels. In general the other method is applied to the whole image without considering the local pixel informations, which is not so effective for the processing time. So in this paper we process local iterative restoration method which iterates many times on detailed portion while in the flat region the iteration decreases. Local iteration method can use any iteration method because it varies in the iteration numbers only. not convergence, which shows decreased processing time.
李泰鴻 嶺南大學校 工業技術硏究所 1986 연구보고 Vol.14 No.1
The poles appear to be the peaks in the frequency spectrum characteristics diagram. For the poles that are placed nearby with each other, the peakes become mingled together to make one peak as a whole. Sometimes we need to know the frequency of a pole to set up the system configuration. By adjusting the radius of circle that counts for the frequency response of the system, we can separate the mingled peak frequency on the z-plane.
李泰鴻 嶺南大學校 工業技術硏究所 1988 연구보고 Vol.16 No.1
Before we process the procedure to recognize the printed characters, it is necessary to preprocess their images obtained by the optical systems. Non-ideal point spread function of the optical systems blurs their images. Deblurring the character images in the spatial domain can be processed using the van Cittert recursive method. Psf, in general, involves the negative portions whose repeated applying reverses the phase each time. The phase reversal causes oscillations in th deblurred images. This can be corrected by deblurring 2nd times for each recursion, which reverses the phase 180°once more to become 0° phase. This phase corrected van Cittert algorithm in the spatial domain makes it possible to simplify the method and to reduce the processing time compared with that of the frequency domain process.
이태홍 한국통신학회 1992 韓國通信學會論文誌 Vol.17 No.8
본 논문은 일반반복 화상 처리가 화상 전체에 화사의 정보와 상관없이 일률적인 방법으로 적용함으로서 생기는 비 효율성을 고려하여 처리하는 화소의 주변 화상 정보를 이용하여 평면 부분과 윤곽 부부느이 처리회수를 달리하여 주므로서 시각적인 효과와 동시에 처리 시간을 단축하는 국부 반복 복원 방법을 제안하였다. 국부 반복 복원 방법은 일반 반복, 복원 알고리즘을 적용하여 윤곽 부분을 집중 복원하고 평면 부분은 복원없이 통과하는 방법으로, 여기에 사용된 일반 반복 알고리즘이 수렴하면 국분 반복 복원도 수렴하게 됨을 이용하였다. 각각 처리된 화상,MSE, 처리 시간등을 비교하여 그 효율성을 확인하였다. A local iterative Image restoration method Is Introduced that processes with varying iteration numbers according to the local statistics. In general almost of the Iterative method applies Its algorithm to the whole Image without considering the local pixel informations, which Is not so effective for the processing time. Usually the edges or details have an Important role In visual effect. So in this paper we process the edges or the details many times while In the flat region we just pass over or decrease iterations. This method shows good MSE (Mean Square Error) improvement, better subjective qualify and reduced processing time.
이태홍 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.4
In this study, an experimental and theoretical program were carried out to determine the cutting forces and chip formation at different cutting speeds using a 0.4mm nose radius ceramic insert and -7˚ rake angle for non heat-treated AISI 4140(27HRc) and heat-treated AISI 4140 (45 HRc) steel. The results obtained were compared to show the hardness differences between the materials. The secondary deformation zone thicknesses when comparing the two materials show different physical structure but similar size. These results were also discussed in light of the heat treatment and the effects it had on the machining characteristics of the material. In addition, the Oxley Machining Theory was used to predict the cutting forces for these materials and a comparison made. The predicted cutting performances were verified experimentally and showed good agreement with experimental data.