• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 1999.10a
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• pp.81-86
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• 1999

Nowadays, as the development period of new products becomes shorter and consumer's requirement is more various, the importance of Rapid Protytyping Technology has been rapidly increased. Rapid Protytyping makes protytypes or functional parts directly using the 3D CAD data. But RP machines can make protytype in limit size. But RP machines can make protytype in limit size. For making large size protytype, we slice solid, which is made of STL file, and then glue sliced solid. This paper is concerned with slicing solid on STL file.

• Korean Journal of Computational Design and Engineering
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• v.10 no.6
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• pp.455-464
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• 2005

This paper discusses the methods of computing tool-paths for machining free-form surfaces on 3-axis CNC machines in die and mould making. In computational view this paper describes the characteristics and issues of the geometric information and the shape, which make computing tool-paths difficult. Important points that should be considered in devising a computing method are also discussed. A newly implemented method is explained and compared with an old method for a commercial CAM system. The implemented method is used in a commercial CAM system and the computing time for an example is presented.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.234-237
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• 2009

CBL[1](Corner Block List)에 기반한 Non-Slicing 플로 플랜 알고리즘은 빈 공간이 없는 Non-Slicing 플로플랜만 나타낼 수 있다. 본 논문에서는 CBL 단점을 보완하고 실제 블록의 크기를 이용하여 최적의 위치에 블록을 배치 하기 위해 contour map을 이용할 것을 제시한다. 본 알고리즘은 배치시 면적을 최소화 하는 방법을 제시하므로 CBL의 단점을 해결하고 더불어 최적해를 찾기 위한 실행 시간을 단축 시키는 효과를 기대할 수 있다.

• Journal of Embryo Transfer
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• v.19 no.1
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• pp.67-73
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• 2004

본 연구는 우리나라 고유의 유전자원인 재래산양의 체내수정란 생산기술을 확립하고자 수행하였다. 흡입법(aspiration)과 세절법(slicing)에 의해 난소 한 개당 회수된 난자의 수는 3.9개와 4.1개를 나타내어 slicing방법이 aspiration방법보다는 많은 숫자의 난자를 회수하였으나 유의적인 차이는 나타내지 않았다. 회수된 난자의 등급별 분포는 aspiration방법에서 Grade I, Grade II, Grade III, Grade IV의 비율이 10.3%, 20.5%, 38.5%, 30.8%를 나타내었으며, slicing법에서는 9.8%, 22.0%, 39.0%, 29.3%를 나타내어 Grade III과 Grade IV의 비율이 70% 이상을 차지하였다. 회수된 난자를 체외성숙 시킨 결과 Grade I과 Grade II에서는 85% 이상이 metaphase H (MII)까지 도달하였으나, Grade III과 Grade IV는 40% 이하의 체외성숙율을 나타내었다. 체외수정용 배양액으로 BO를 사용하였을 경우 Grade I 및 II에서 84.4%의 난분할율을 나타내어 TALP를 사용하였을 때의 58.8%보다 높은 난할율을 보였다. 또한 배양액의 종류별 체외발달율에 있어서는 상실배 및 배반포기배로의 발달은 mSOF를 배양액으로 이용하였을 경우 15.0%의 발달율을 나타내었으며, 체외배양 시 항산화물질인 glutathione (GSH)을 첨가함으로서 26.8%의 상실배 및 배반포배로의 발달율을 나타내었다.

• International Journal of CAD/CAM
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• v.4 no.1
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• pp.33-45
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• 2004

In this work, a rational procedure has been formulated for the selection of points approximating slice contours cut in LOM (Laminated Object manufacturing) with first order approximation. It is suggested that the number of points representing a slice contour can be 'minimised' or 'optmised' by equating the horizontal chordal deviation (HCD) to the user-defined surface form tolerance. It has been shown that such optimization leads to substantial reduction in slice height calculations and NC codes file size for cutting out the slices. Due to optimization, the number of contour points varies from layer to layer, so that points on successive layer contours have to be matched by four sided ruled surface patches and triangular patches. The technological problems associated with the cutting out of triangular patches have been addressed. A robust algorithm has been developed for the determination of slice height for optimum and arbitrary numbers of contour points with different strategies for error calculations. It has been shown that optimisation may even lead to detection and appropriate representation of elusive surface features. An index of optimisation has been defined and calculations of the same have been tabulated.

• The Transactions of the Korea Information Processing Society
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• v.4 no.4
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• pp.982-992
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• 1997

Almost all the software develpoment cost is especially spwnede in the test phase of kifecycle.Backtracking method and program slicing methed are often used for debugging.But these have need of abundant experience on debuggers or can't apply for large scale programs.In this paper, I used informations of design documents which is generally used, and proposed a new determination method of error positions combining backtracking method and program slcing method.I described several fundamental concepts, error classes, standard design documents and determination method of error positions to porpose a debugging method, and I explained the process of proposed method using an example program with errors.Finally, I compared and analysed the proposed method with usual slicing methods.

• The Journal of the Korea Contents Association
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• v.6 no.10
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• pp.114-125
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• 2006

In the previous work, we presented HDT for locating logical errors in Java programs. The HDT locates an erroneous method at an execution tree using an algorithmic program debugging technique and locates a statement with errors in the erroneous method using a step-wise program debugging. It reduced the number of programmer debugging in Java programs. But the HDT still increases the number of debugging because the size of the recent programs increases than the past programs and the number of methods is increasing. This paper proposes HDTS using a program slicing technique (PST) at the MDT. HDTS can reduce the number of programmer debugging. Specially, the more the number of methods and statements increases, the more HDTS has effects.

• Transactions of Materials Processing
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• v.27 no.5
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• pp.314-322
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• 2018

AlSi12 is a heat-resistant aluminum alloy that is lightweight, corrosion-resistant, machinable and attracting attention as a functional material in aerospace and automotive industries. For that reason, AlSi12 powder has been used for high performance parts through 3D printing technology. The purpose of this study is to observe deposition characteristics of AlSi12 powder in a direct energy deposition (DED) process (one of the metal 3D printing technologies). In this study, deposition characteristics were investigated according to various process parameters such as laser power, powder feed rate, scan speed, and slicing layer thickness. In the single track deposition experiment, an irregular bead shape and balling or humping of molten metal were formed below a laser power of 1,000 W, and the good-shaped bead was obtained at 1.0 g/min powder feed rate. Similar results were observed in multi-layer deposition. Observation of deposited height after multi-layer deposition revealed that over-deposition occurred at all conditions. To prevent over-deposition, slicing layer thickness was experimentally determined at given conditions. From these results, this study presented practical conditions for good surface quality and accurate geometry of deposits.

• Korean Journal of Computational Design and Engineering
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• v.11 no.3
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• pp.223-233
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• 2006

Layered manufacturing(LM) is emerging as a new technology that enables the fabrication of three dimensional heterogeneous objects such as Multi-materials and Functionally Gradient Materials (FGMs). Among various types of heterogeneous objects, more attention has recently paid on the fabrication of FGMs because of their potentials in engineering applications. The necessary steps for LM fabrication of FGMs include representation and process planning of material information inside an FGM. This paper introduces a new process planning algorithm that takes into account the processing of material information. The detailed tasks are discretization (i.e., decomposition-based approximation of volume fraction), orientation (build direction selection), and adaptive slicing of heterogeneous objects. In particular, this paper focuses on the discretization process that converts all of the material information inside an FGM into material features like geometric features. It is thus possible to choose an optimal build direction among various pre-selected ones by approximately estimating build time. This is because total build time depends on the complexity of features. This discretization process also allows adaptive slicing of heterogeneous objects to minimize surface finish and material composition error. In addition, tool path planning can be simplified into fill pattern generation. Specific examples are shown to illustrate the overall procedure.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.27 no.4
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• pp.485-490
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• 2003

RP(Rapid Prototyping) has been used in the various industrial applications. This paper presents the optimization techniques fur fabricated 3D model design using RP machine for the medical field. Once the original brain model data are obtained from 2D slices of MRI/CT machine, the data can be modeled as an optimal ellipse. The objective of this study includes optimization of fabrication time and surface roughness using the adaptive slicing method. It can reduce fabrication time without losing surface roughness quality by accumulating the slices with variable thickness. According to the parameter tuning and synthesis of its effect, more suitable parameter values can be obtained by enhanced 3D brain model fabrication. Therefore, accurate 3D brain model fabricated by RP machine can enable a surgeon to perform pre-operation. to make a decision for the operation sequence and to perceive the 3D positions in prototype, before delicate operation of actual surgery.