• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.3
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• pp.319-324
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• 2006

The objective of this study is to design and analyze a dual spring type rope brake. In general, a dual rope brake system are a device for an elevator in safety. Therefore, they are very important and difficult in designing. The finite element model was developed to compute stress, strain and friction force for a dual spring type rope brake. ANSYS code was applied for this investigation.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.3
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• pp.379-384
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• 2006

The paper describes a method of user feedback in order to enhance the retrieval effectiveness. In this paper, to overcome a weak point of the existing feedback function adapting fuzzy technique, we proposed the interaction function using gaussian function that gives different learning rate according to choice of components with same function. And, we grade degree that the user opinion is reflected to a system by applying user profile to the feedback function. User retrieval feedback method is adaptive retrieval method that makes a slow change for a long time using feedback function adapting gaussian function and user profile.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.3
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• pp.365-372
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• 2006

We expect u-Education based on ubiquitous information and technology will be the next generation education system. We performed a comparative study of well designed school homepage at H elementary school and the other case of homepage at C elementary school in Seoul. We conclude the former shows better performance and educational achievement under U-Learning environment and we propose a next generation U-Learning system architecture.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.3
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• pp.409-413
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• 2006

The accumulated deformation due to the undrained creep causes the general stability problem for the overall soil mass. In this study, the time-dependent constitutive equation, into which a damage law, modified cam clay model, and Perzyna's generalized viscous theory were incorporated, was derived microscopically. The model prediction agreed well with the experimental result including the case of the undrained creep rupture.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.3
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• pp.414-419
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• 2006

In this paper, the numerical results using the Mohr-Coulomb and the Duncan-Chang models, on the stresses and strains of a tunnel under a deep open-cut site and the surrounding ground, were compared with each other. The Mohr-Coulomb model produced larger values than the Duncan-Chang model in stress and displacement of tunnel and ground.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.7 no.3
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• pp.420-430
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• 2006

This research aims at implementing an automation-based building code checking system which will be employed for Architectural Registration Examination. By creating a specific building data model and implementing an automatic building code checking module, the research aims is accomplished. The contribution of this research are as follows; it becomes possible to execute a systematic building code checking. And unlike the existing automatic building code checking systems, it successfully addresses a way of increasing the number of checklist without modifying the system.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.2 no.2
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• pp.25-31
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• 2001

The TRIZ theory which was invented by Russian scientist Genrich Altshuller provides a systematic methodology for innovative engineering design in place of brainstorming. synectics, analogical thinking, which seeming1y high efficiency are still variations of the trials and errors method. TRIZ theory gives designer the ability to explore design solutions in fields other than his (her) own experience. Among several TRIZ theories, most widely used techniques in engineering field are contradiction theory. Su-Field analysis, physical phenomenon and effect and directed production evolution. which are described in this thesis and its application to conceptual design of high-speed train is performed as a case study of TRIZ theory.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.4 no.3
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• pp.168-171
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• 2003

Nano pattern structure is produced using the conventional injection molding and the MmSH method. Plastic parts using PC make used of the MmSH method is much better than the other about manufacture showed transcription of nano pattern. The conventional injection molding, transcription of plastic parts with nano pattern using HIPS showed better than PC. In the result, transcription of nano pattern improve when well liquidity and high temperature of mold surface.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.4 no.3
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• pp.214-217
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• 2003

본 연구에서는 IPA(isopropyl alcohol)를 분해물질로 선정하여 플라스틱 광섬유(Plastic Optical Fiber, POF)에 TiO₂ 를 코팅하여 오염물질을 분해하였다. P-25가 코팅된 POF의 표면은 유기계, 무기계, 유ㆍ무기 바인더를 사용한 것 모두 깨끗하였고, 무기계 바인더를 사용하여 코팅한 POF는 부착력이 현저히 떨어졌다. IPA분해 결과, 무기계 바인더를 사용한 경우, 다른 종류의 바인더와는 다르게 IPA의 초기농도 값이 매우 작게나왔는데 이러한 결과는 반응기에 주입된 IPA가 평형이 될 때까지 기다리는 동안 흡착이 일어났기 때문으로 생각된다. 유기계 바인더를 사용하여 코팅한 POF는 IPA 분해 효율이 매우 저조하였고 유ㆍ무기 바인더를 사용하여 코팅한 POF의 IPA분해 효율은 우수하였다. P-25와 IPA의 분해 효율이 우수한 유ㆍ무기 바인더의 비율을 10 : 10, 10 : 8, 10 : 6, 10 : 4, 10 : 2로 바꾸어 IPA를 분해한 결과, P-25와 유 ㆍ 무기 바인더의 비율이 10 : 2 일 매 IPA 분해 효율이 가장 우수하였다. 또한 P-25와 코팅액 제조 시 희석제로 사용되는 에탄올의 질량비를 1 : 7, 1 : 11, 1: 15로 바꾸어 IPA를 분해한 결과, P-25와 에탄올의 비율이 1 : 15일 때 IPA분해 효율이 가장 우수하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.4 no.3
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• pp.252-256
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• 2003

This paper deals with a case study on the development of computerized scheduling system for core products. We propose a heuristic algorithm which is based on the sequencing rules and the allocation rules to satisfy the due date for each product, and develop a scheduling system for the manufacturer of core products. The system operates under a client/server circumstance. The important information constitutes a database, and it can be retrieved whenever it is needed. The benefits of the scheduling system are the exclusion of hand operations of data, the reduction of execution time for production planning and the reduction of average inventories.