• Transactions of the Korean Society of Machine Tool Engineers
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• v.17 no.5
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• pp.116-122
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• 2008

In order to establish automation or optimization of the machining process, predictions of the forces in machining are often needed. A new model fur farces in milling with the experimental model based on the specific cutting pressure and the Oxley's predictive machining theory has been developed and is presented in this paper. The specific cutting pressure is calculated according to the definition of the 3 dimensional cutting forces suggested by Oxley and some preliminary milling experiments. Using the model, the average cutting forces and force variation against cutter rotation in milling can be predicted. Milling experimental tests are conducted to verify the model and the predictive results agree well with the experimental results.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.34 no.3
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• pp.35-40
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• 2011

5-axis laser cutting has great advantages when it is applied to three dimensional machining requiring high cutting quality. For developing 5-axis CNC laser cutting systems, however, many problems such as rotating a laser head or a working table, 5-axis servo-control mechanism, tool path generation and post-processing, and collision avoidance between a laser head and a work-piece should be solved. In this paper, we deal with developing a motion simulator for 5-axis laser cutting machine with a nutating cutting head whose rotational axis is in an inclined plane. Two essential modules such as post-processor and cutting motion simulator was developed based on a commercial 3D CAD of UG-NX. The developed system was applied to three dimensional cutting products and showed the validity of the developed methods.

• International Journal of Naval Architecture and Ocean Engineering
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• v.4 no.3
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• pp.228-240
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• 2012

Morphing is a geometric interpolation technique that is often used by the animation industry to transform one form into another seemingly seamlessly. It does this by producing a large number of 'intermediate' forms between the two 'extreme' or 'parent' forms. It has already been shown that morphing technique can be a powerful tool for form design and as such can be a useful addition to the armoury of product designers. Morphing procedure itself is simple and consists of straightforward linear interpolation. However, establishing the correspondence between vertices of the parent models is one of the most difficult and important tasks during a morphing process. This paper discusses the mesh-merging method employed for this process as against the already established mesh-regularising method. It has been found that the merging method minimises the need for manual manipulation, allowing automation to a large extent.

• Journal of the Korea Society of Computer and Information
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• v.20 no.10
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• pp.45-51
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• 2015

In this paper, we propose a way to reduce the SW reliability test time and human errors by utilizing the Lean Six Sigma methodology as a troubleshooting tool. Recently, SW technology is rapidly changing and the importance of SW management has been recognized. Accordingly, the SW reliable test for the SW development outcomes in one of the methods for SW quality improvement is required. However, it consumes a lot of development costs, has the time constraints and human errors in SW reliable test, so, it is difficult to meet the requirements for SW test.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.52 no.9
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• pp.506-512
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• 2003

In this paper, a communication module between Relay agents in a multi-agent system based power distribution network protection system is realized using DNP3.0(Distributed Network Protocol), which is the standard communication protocol of distribution automation system in KEPCO. The key words for agent communication in the multi-agent based protection system are defined and represented by use of DNP application function code. The communication module developed based on the proposed communication scheme is tested by use of the Communication Test Harness, a test tool for DNP protocol, then used to the multi-agent system based power distribution net work protection system.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2004.05a
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• pp.412-418
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• 2004

In this paper, a new distributed intelligent control module based on LonWorks fieldbus for air handling unit(AHU) of heating, ventilating and air-conditioning(HVAC) is proposed to replace with a conventional direct digital control(DDC) with 32 bit microprocessor. This article also addresses an Internet-based HVAC system architecture that combines Web technology and networking. The proposed control architecture has a excellent features such as highly compact and flexible function design, a low priced smart front-end and reliable performance with various functions. This also addresses issues in control network configuration, logical design of field devices by S/W tool, Internet networking and electronic element installation. Experimental results showing the system performance are also included in this paper.

• 한국IT서비스학회:학술대회논문집
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• 2005.11a
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• pp.311-318
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• 2005

최근 정보 시스템의 기능이 복잡화, 거대화하고 있는 추세에 따라 감리인이 수작업으로 시험시나리오를 작성하고, 검증시험을 실시하는 것은 매우 비효율적이라고 할 수 있으며, 결과로 얻어진 증적 자료는 신뢰성 및 객관성 면에서 한계를 가지게 된다. 정보시스템 감리의 시험단계에 대하여 적정한 시험도구를 도입 ${\cdot}$ 적용함으로써 감리 시행의 효율성을 제고하고 정량적인 판단 근거를 제시하여, 감리 의견의 신뢰성 및 일관성을 확보하는데 도움이 될 수 있다. 본 연구에서는 감리서비스요인이 감리품질과 감리성과간의 관계에 미치는 영향과 이들과 자동화 도구 적용의 적합관계를 규명하고, 나아가서 감리품질과 감리성과간의 관계를 규명하고자 하였다. 연구결과, 자동화 도구가 감리품질에 유의한 영향요인이며, 또한 감리품질은 감리성과에, 그리고 자동화 도구의 적용이 감리성과에 유의한 영향을 미치는 것으로 밝혀졌다.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07b
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• pp.382-384
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• 2005

임베디드 소프트웨어는 다른 일반 시스템과는 여러 가지 다른 특성을 가지고 있다. 우선 프로세서 자원과 메모리 자원을 적게 사용해야 하며, 소프트웨어의 오류에 대해 데스크 탑 또는 기타 서버환경에 비해 확실한 소프트웨어의 검증을 요구한다. 이러한 소프트웨어의 검증은 임베디드 소프트웨어의 오류허용이 다른 환경에 비해서 매우 다르기 때문에 고난도의 임베디드 소프트웨어의 응용을 빠르고 안정되게 개발하기 위해서는 사용자가 쉽게 사용할 수 있는 기술이 절실히 필요한 실정이다. 본 논문에서는 기존의 테스팅 자동화도구의 핵심 이슈인 테스트 데이터 제너레이터와 테스트 스크립트의 기능을 포함한 모듈인 테스트슈트 제너레이터의 성능향상 위한 방법을 제시한다. 제시된 테스트슈트 제너레이터 모듈은 임베디드 소프트웨어 테스팅 자동화도구의 개발 시 활용하여 개발한다면 임베디드 소프트웨어를 보다 효과적으로 테스팅 할 수 있을 것으로 예상된다.

• 한국생물공학회:학술대회논문집
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• 2000.11a
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• pp.119-122
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• 2000

Biological science is being revolutionized by the availability of much sequence information from many genome project With the advanced technology at hand, main trend in biological research is rapidly changing from a structural DNA analysis to understanding cellular function of the DNA sequences. Combined with mechanics, computer, bioinformatics and other advanced technologies, DNA chip technology provides numerous applications because of its robustness, accuracy, and automation. DNA chip is expected to become an indispensable tool in fields of biology, biotechnology, drug discovery, and other application areas. DNA chip can be used for mutation and polymorphism detection, gene expression monitoring and phenotypic analysis as well. If DNA chip is used for the development of pharmaceutical products, it can considerably reduce the cost and time for the entire process of drug discovery and development, and can also contribute in developing personal drugs.

• Journal of the Korean Society for Precision Engineering
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• v.14 no.2
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• pp.84-91
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• 1997

This paper reports the effort for developing this new Unified Manufacturing Instruction Set and its environment, called here UniSet, to deal with difficulties in set up and operation of Flexible Manufacturing Cells, UniSet has been developed as a non-exclusive unified manufacturing instruction set based on com- parisons of the prevailing machine tool and programming primitives. UniSet allows programmers to deal with only one instruction set, if they so desire, in a single coherent enviroment, rather than numerous machine programming languges. The software system is coded in an Object-Oriented Programming (OOP) language, Smalltalk, and derives its paradigm from the OO philosophy. Test results are also includ- ed to demonstrate the applicability of the approach employed.