• International Journal of CAD/CAM
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• 제2권1호
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• pp.29-37
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• 2002

De-manufacturing is an entire process of collecting, disassembling, reusing, refurbishing, recycling, and/or disposing products that are obsolete or un-repairable. Designing the products for inexpensive and efficient disassembly enhances the ease of de-manufacturing. Virtual disassembly addresses the difficulty and the methods to disassemble a product in design stage rather than really disassemble a product at the end of its life cycle. Based on the virtual disassembly analysis results, design will be improved for better assembling/disassembling. This paper presents a systematic virtual disassembly methodology such as disassembly relation modeling, path/sequence automatic generation and evaluation. This paper also presents a new virtual disassembly interface paradigm via virtual reality technology for disassembly simulation in virtual environment.

• 한국정밀공학회지
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• 제16권8호
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• pp.88-99
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• 1999

In this paper, a disassemblability evaluation has been investigated quantitatively by using an ease-of-disassembly design method. Four categories such as recognizability, approachability, separability, and treatability have been analyzed in details. A simulation software for estimating the ease-of-disassembly design method has been developed and applied to door trim and spin basket respectively as an example.

• 한국군사과학기술학회지
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• 제18권5호
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• pp.594-601
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• 2015

The purpose of this research is to propose a maintenance support system for deciding assembly sequence of the product and appropriate tools that are used to assembly and disassembly of parts in the product when geometric properties of the product. The digital maintenance system (DMS) is developed to generate the maintenance guideline and the initial experiment is conducted especially for an underwater weapon system with cylindrical structure. DMS considers four factors to find the efficient assembly and disassembly procedure automatically: (1) assembly tree, (2) properties of each part, (3) distance from the center of the product, and (4) volume. Based on the factors, DMS simulate the movement of each tool virtually and the properties of tools are investigated to find an appropriate tool for using assembly and disassembly of each part in the product. The proposed approach integrates modeling, simulation, data configuration, and virtual reality to allow a development of preliminary maintenance guidance.

• Industrial Engineering and Management Systems
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• 제3권1호
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• pp.12-21
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• 2004

This paper investigates the design of a priority rule in a multi-product disassembly environment. Specifically, it is concerned with product scheduling by which the inventory control of disassembled parts can be incorporated into a priority rule to reduce part lead times. The part lead time consists of two components: flow time and supply delay. The primary focus of the paper is on the development of a disassembly priority rule that aims to reduce the supply delay. We propose a priority rule, called Minimum Distance (MD) rule, to improve the supply delay performance. Finally, we provide a comparative analysis on the performance of traditional rules and the new rule proposed in this paper via a simulation model.

• Journal of Power Electronics
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• 제19권1호
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• pp.79-88
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• 2019

The neutral-point (NP) voltage of three-phase three-level NP-clamped converters is needed for balance. To maintain NP potential and suppress ripple, a novel NP voltage balancing strategy is proposed in this work. The mechanism of NP voltage variation is studied first. Then, the relationship between the disassembly of zero level (O level) and NP current is studied comprehensively. On these bases, two methods for selecting one of three output phases for the disassembly of its O level are presented. Finally, simulation and experimental results verify the validity and practicability of the proposed algorithms.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 하계종합학술대회 논문집(2)
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• pp.246-249
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• 2000

In this paper, we describe an automated extraction program that transforms a mask layout into an approximated equivalent circuit information suitable for circuit simulation, and that extract the geometric parameters of stacked MOSFETs and the distributed RCs of layout blocks. To extract equivalent circuit from mask layout, we propose new block disassembly technique capable of accurate computations of distributed RCs at branch point, using vectorized edges which represent the outline of an individual polygon.

• 한국CDE학회논문집
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• 제18권6호
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• pp.417-427
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• 2013

Assembly direction is used in order to confirm the generated assembly sequences in an automatic assembly sequence planning system. Moreover, assembly sequence planners can ascertain the feasibility of a sequence during simulation with assembly direction based in a CAD environment. In other words, assembly direction is essential for sequence optimizing and automatic generation. Based on the importance of assembly direction, this paper proposes a method to select the best direction for the generated assembly sequence using disassembly simulation and geometrical common area between assembled parts. Simultaneously, this idea can be applied to verify the generated assembly sequence. In this paper, the automatic selection of assembly direction and sequence correction system is designed and implemented. The developed algorithms and the implemented system are verified based on case study in the CAD environment.

• 한국시뮬레이션학회논문지
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• 제20권3호
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• pp.119-127
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• 2011

전면정비란 일정기간동안 사용한 장비(기계, 설비 등)를 부품 단위로 분해하여 부품별로 수리를 한 후 재조립하는 과정을 의미다. 전면정비는 주로 항공기, 선박, 철도차량, 무기체계, 중장비 등과 같이 수명이 길고 고가인 장비를 운영하는 과정에서 발생한다. 이러한 정비 사업에서는 리드타임(Lead Time)을 단축시키는 것이 중요하며, 납기에 맞추어 정비를 완료할 수 있도록 생산시스템을 설계하는 것이 주요 관심사이다. 본 논문에서는 전면정비를 하는 정비 공장을 대상으로 3D시뮬레이션 도구인 $QUEST^{TM}$를 이용하여 시뮬레이션을 수행한 사례를 소개한다. 먼저 전면정비 공장의 공정특성과 시뮬레이션 모델 구축시 고려해야 하는 사항들을 중점적으로 설명하였다. 그리고 흐름생산방식과 셀생산방식 등 두 가지 해체작업 방식을 포함한 다양한 시뮬레이션 시나리오에 대해 시뮬레이션 실험을 통한 분석결과를 제시하였다.

• 대한전자공학회논문지SD
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• 제38권12호
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• pp.75-84
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• 2001

오늘날 집적회로의 집적도가 증가되고 있기 때문에 회로 소자는 기생성분의 영향을 최소화하고 회로의 성능을 감소시키는 요인을 최소화하도록 설계되어야 한다. 그래서 칩을 제작하기 전에 레이아웃으로부터 추출한 회로가 정확한가를 검증하고 시뮬레이션으로 추출된 회로가 설계사양을 만족하는지를 확인해야 한다. 본 논문에서는 스택 구조의 MOSFET의 기하학적인 파라미터와 레이아웃 배선 블록의 분산 RC를 추출할 수 있는 새로운 블록 분할 기법을 제안한다. 폴디드 캐스코드 CMOS 연산 증폭기의 레이아웃에 이 기법을 작용하여 회로를 추출하고, Hspice로 시뮬레이션을 수행하여 전기적 연결관계와 이들 소자의 영향을 검증하였다.

• 한국산업융합학회 논문집
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• 제20권4호
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• pp.299-305
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• 2017

This study proposes a new technique to design and control of robot hand gripper for assembling and disassembling of a machine parts. The motion equation describing dynamics of the manipulators and object together with geometric constraint is formulated by Lagrange-Euler's equation. And the problems of controlling both the grasping force and the rotation angle of the grasped object under the constraints are analyzed. The effect of geometric constraints and a method of computer simulation for overall system is verified. Finally, it is illustrated that even in case of there exists a sensory feedback from sensing data of the rotational angle of the object to command inputs control of joint and this feedback connection from sensing data to control grasping of machinery parts.