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Development of a Theoretical Model to Predict Cutting Forces for Hard Machining
이태홍 한국정밀공학회 2011 International Journal of Precision Engineering and Vol. No.
In this study, a theoretical model was developed to predict cutting forces for machining hard materials that contain more than 0.58% carbon. The model is based on the Oxley machining theory, and it uses the Johnson-Cook empirical constitutive law for the flow stress data or the equation of a hard material and the tool geometric parameter, the nose radius. However,Oxley and his co-workers showed that the flow stress data obtained from high-speed compression tests for a range of only plain carbon steels (less than 0.58% carbon) is suitable for making analytical machining predictions assuming a perfectly sharp tool. In this study, an experiment was carried out to obtain the flow stress in the Johnson-Cook law and the geometry of the tool was simplified to obtain the nose radius. The cutting forces from the developed theoretical model were found to be in good agreement with those measured from an experiment of hard machining with an AISI 4140 steel heat-treated bar.
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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.
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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.
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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.
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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.
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이태홍 한국통신학회 1992 한국통신학회논문지 Vol.17 No.8
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.
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