• 한국항공우주학회지
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• 제35권11호
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• pp.1036-1042
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• 2007

비행조종컴퓨터 하드웨어 개발은 상용 툴 및 전용 개발치구가 전무하여 전 근대적인 방법으로 개발하고 있어 개발 기간을 단축하기가 용이하지 않다. 모델링 및 시뮬레이션과 가상현실 기술을 이용하여 비행조종컴퓨터 하드웨어 개발에 적용하는 프로세스 개선 툴이 필요하게 되었다. 본 논문에서는 비행조종컴퓨터 입/출력 신호 흐름, 입력 신호의 고장모니터 및 고장 관리 알고리즘, 논리 회로의 작동, 회로기판 조립체의 형상 및 장착 등과 같은 비행조종컴퓨터의 설계특성을 가상의 공간에 시각화 하고 모사할 수 있는 프로세스 개선 툴을 제안한다. 프로세스 개선 툴 사용자는 open flight format의 3차원 모델링 데이터를 이용하여 구성된 비행조종컴퓨터 모델을 사용하여 회로기판 조립체까지 분해/조립을 할 수 있으며 다양한 비행조종컴퓨터 설계 형상을 시뮬레이션 할 수 있다.

• 한국자동차공학회논문집
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• 제21권3호
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• pp.98-104
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• 2013

The effect of the tool-sheet interaction on formability enhancement in electromagnetic forming is investigated using FEM. A free bulging and a conical forming die with 0.7mm AL1050 sheet are used to evaluate damage evolution based on Gurson-Tvergaard-Needleman plasticity material model. The impact between the tool and sheet results in complex stress states including compressive hydrostatic stresses, which leads to a suppression of void growth and restrain ascending void volume fraction of the sheet. Therefore, the damage suppression due to the tool-sheet interaction can be the main factor contributing to the increased formability in the electromagnetic forming process.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 추계학술대회 논문집
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• pp.354-361
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• 2005

In high speed cutting process, due to the friction between the tool and workpiece, a temperature rise of contacting part is serious. It need to develop cutting tool for overcoming such a poor condition. So now, some studies, the optimization of tool shapes, the fine grains of tool material, multi-layer coating of tools are processing. If mirror finishing on the tool is processed, there is advantage of relation between chip and tool, because of less friction, and also tool's lift would be increased. As a result mirror like finishing is expected efficient enhancement of tool. Generally, it is too difficult to process by a general way for tools of complex shapes, it is required a new method to process such complex shape tools. The magnetic fluid polishing technique can polish the workpiece of complex shape, because the polishing method which polishes as compress the workpiece by the magnetism abrasives to arrange to the linear according to the line of magnetic force. In this paper, We polished the surface of the high speed cutting tool using the magnetic fluid polishing technique, to enhance the performance of the high speed cutting tool.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2007년도 춘계학술대회 논문집
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• pp.42-47
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• 2007

The characteristics of the tool system give many effects into the costs and qualities for the finished components. Therefore, a tool life is one of the important issues on cold forging industry. However, since variables related with tool life are many complicated, the studies for solution should be investigated by the systematic research approach. The shape and process changes of die, the hardness changes of material and the tolerance of dies to decrease the die stress are analyzed by the FEM software. The heat-treatment of tool material is investigated to improve the tool life. Deep cryogenic treatment of tool steel is very efficient to improve the wear resistance due to the fine carbide. And, it is investigated that the shape and dimension of tool give effect into both tool life and quality of forged product..

• Journal of Mechanical Science and Technology
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• 제16권5호
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• pp.633-638
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• 2002

An approach to enhance dimensional accuracy of the grinding process has been presented, and grinding of a glass material with a metal-bonded diamond wheel has been studied. In this study, a grinding tool is suspended flexibly and controlled by an electromagnetic actuator. During grinding, profile error of a ground surface is indirectly measured and fed back to a control system. A model of grinding error has been suggested on which the indirect measurement has been based. An optimal PID control is adopted and effectiveness of the in-process feedback control has been verified experimentally.

• 대한방사선기술학회지:방사선기술과학
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• 제24권1호
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• pp.67-73
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• 2001

In digital image processing, the homomorphic filtering approach is derived from an illumination-reflectance model of the image. It can also be used with an illumination-transillumnation model of X-ray film. Several X-ray images were applied to enhancement with histogram equalization and homomorphic filter based on an illumination-transillumination model. The homomorphic filter has proven theoretical claim of image density range compression and balanced contrast enhancement, and also was found a valuable tool to process analog X-ray images to digital images.

• 아동학회지
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• 제32권3호
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• pp.163-184
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• 2011

This study was conducted in order to inquire into the impact of children's self-concept construction and ego-development enhancement during Group Sandplay Therapy. The Group Sandplay Therapy sessions were held once week, for a total of 20 weeks. The Group Sandplay Therapy Process consisted of playing with sand and creating a sand tray in groups. There were two group in total. Each group had 4 children of the same sex aged from six to seven years old. In order to study the self-concept and ego-development, we used a self-concept test and ego-development as a research tool. In addition, the present research analyzed any changes which tool place by dividing each aspect in each sand tray of the therapy process into a positive subject and a negative subject, and analyzed the changing patterns seen in the sand tray worldas it unfolded. It was proven that an efficient treatment in changing the sand tray world and children's action, had an effect on rearranging the children's mental schemas. In terms of the progress of the sandplay journey, it was seen that negative elements decreased dramatically and positive elements were observed to have increased. As a result it was confirmed that Group Sandplay Therapy had a number of positive effects in the construction of children's self-concept and in terms of the enhancement of children ego-development.

• 한국정보처리학회논문지
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• 제3권4호
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• pp.834-845
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• 1996

소프트웨어의 통합환경을 구축하기 위해 통합 프로젝트 지원한경(IPSE: Integrated Project Support Environ-ment)을 구축할 때에는 2가지의 문제가 발생한다. 첫째는 도구의 밀도에 관한 문제이다. 여러 가능을 하나로 통합하는 조립 과정을 거친 도구들의 인터페이스에 관한 문제와 도구의 일 부 기능을 다른 도구와 함께 사용하는 경우 닫혀진 인터페이스로 인해 이용이 곤란해지는 경우가 발생할 수 있다는 점이다. 둘째는 프 로세스에 관한 자료를 수집할 때 발생할수 있는 문제이다. 개발 프로세스를 향상시키 기 위해 이를 측정하려고 할 때 도구를 사용하여 개발된 것이 아니기 때문에 측정이 곤란하다는 점이다. 본 연구에서는 이와 같은 문제를 해결하기 위해 도구를 정밀도화 하고 프로세스 정보를 취득하기 위한 기구를 추가할 필요성을 기술하고 문제해결을 위한 분석과 설계 방안을 모색하였다. 그리고 도구의 결합도와 응집도 및 통합적합성 에 대한 메트릭스를 제안하였다. 끝으로 본 연구결과에 기초하여 환경을 구축하는 경우에 일어날 수 있는 문제점에 대한 고찰과 평가를 하였다.

• 한국공작기계학회논문집
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• 제14권4호
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• pp.104-109
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• 2005

The catalyst layer design is one of the most important factors to enhance the performance of PEMFC(Proton Exchange Membrane Fuel Cell) system. The hydrophobic and ion conductive type is studied for the MEA(Membrane Electrolyte Assembly). It is found that those have some limitations for performance enhancement when they are used separately. Thus, the dual catalyst type, a mixed model, is developed for the better MEA performance. In the meantime, the design of flow field plate is subsequently carried out in order to give more enhanced output during its operation. The conductivity of flow field plate showed better performance in the case of manufactured by the more compressed process(20MPa) than by the less compressed process(10MPa). The micro-structure of the flow field plate is examined in details using SEM(Scanning Electron Microscope) to analyse the effects on the different compression processes.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 추계학술대회 논문집
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• pp.44-44
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• 2009

Fault detection is necessary for yield enhancement and cost reduction in semiconductor manufacturing. Sensory data acquired from the semiconductor processing tool is too large to analyze for the purpose of fault detection and classification(FDC). We studied the techniques of fault detection using statistical method. Multiple regression analysis smoothly detected faults and can be easy made a model. For real-time and fast computing time, the huge data was analyzed by each step. We also considered interaction and critical factors in tool parameters and process.