• 한국지반환경공학회 논문집
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• 제10권3호
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• pp.29-36
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• 2009

본 논문에서는 초고층 건축물이 풍화대지반에 위치하여 대구경 현장타설 말뚝기초로 지지되고 있는 사례를 분석하였다. 본 논문에서 제시한 말뚝기초의 설계 사례는 "예비설계-검증시험-예비설계의 보완"의 3단계를 거쳐 말뚝기초의 설계를 완성한 대표적인 사례로 볼 수 있으며, 검증시험으로 2회의 양방향 고유압 말뚝재하시험이 수행되었다. 이와 같은 설계절차를 준수할 경우 말뚝기초의 경제적인 설계를 수행할 수 있으며, 이를 통하여 말뚝기초 공사비의 대폭적인 절감을 이룰 수 있을 것이다.

• 경영과학
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• 제27권3호
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• pp.15-31
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• 2010

We consider a reverse logistics network design problem for recycling. The problem consists of three stages of transportation. In the first stage products are transported from retrieval centers to disassembly centers. In the second stage disassembled modules are transported from disassembly centers to processing centers. Finally, in the third stage modules are transported from either processing centers or a supplier to a manufacturer, a recycling site, or a disposal site. The objective is to design a network which minimizes the total transportation cost. We design a cooperative coevolutionary algorithm to solve the problem. First, the problem is decomposed into three subproblems each of which corresponds to a stage of transportation. For subproblems 1 and 2, a population of chromosomes is constructed. Each chromosome in the population is coded as a permutation of integers and an algorithm which decodes a chromosome is suggested. For subproblem 3, an heuristic algorithm is utilized. Then, a performance evaluation procedure is suggested which combines the chromosomes from each of two populations and the heuristic algorithm for subproblem 3. An experiment was carried out using test problems. The experiments showed that the cooperative coevolutionary algorithm generally tends to show better performances than the previous genetic algorithm as the problem size gets larger.

• 전기학회논문지
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• 제58권1호
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• pp.57-62
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• 2009

This paper deals with the optimal design of a shield plate in order to minimize Extremely-Low-Frequency(ELF) magnetic fields generated from three-phase bus bars. Combining an evolutionary strategy with a 3D finite element analysis tool, the main dimensions of the shield plate are sought out. The optimization procedure consists of two separated design stages to take into account all foreseen structures of the plate. In the first stage, the basic dimensions of the plate are optimized including the distance between the plate and the bus bars. Then the usefulness of the additional structures such as a slit and fillet is investigated in the second stage. Finally the optimum design of the shield plate is suggested from the viewpoint of the shielding effectiveness and manufacturing cost.

• 산업공학
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• 제9권3호
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• pp.236-248
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• 1996

Most of business enterprises today struggle with the coordination of work which is one of the most challenging problems in the business environment. And the situation becomes worse by the increasing complexity and uncertainty. In this paper, suitability of workflow technology for the modelling, optimization, and automation in the complex business structures is discussed. Also, in the abscence of a fully fledged method for analysis and design of workflow systems, this paper proposes a method, ETM(Extended Trigger Modelling), which can solve several problems in other methods. The proposed ETM approach consists of three stages such as situation analysis stage, activity coordination stage and implementation preparation stage. A modelling case of the proposed procedure is also presented.

• Computers and Concrete
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• 제32권2호
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• pp.185-206
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• 2023

This article aimed to explore the optimization of mineral admixtures and retarding admixture for high-performance concrete. In essence, fresh concrete can be regarded as a mixture in which both coarse and fine aggregates are suspended in a cement-based matrix paste. Based on this view, the test procedure was divided into three progressive stages of binder paste, mortar, and concrete to explore their rheological behavior and mechanical properties respectively. At each stage, there were four experimental control factors, and each factor had three levels. In order to reduce the workload of the experiment, the Taguchi method with an L9(3⁴) orthogonal array and four controllable three-level factors was adopted. The test results show that the use of the Taguchi method effectively optimized the composition of high-performance concrete. The slump of the prepared concrete was above 18 cm, and the slump flow was above 50 cm, indicating that it had good workability. On the other hand, the 28-day compressive strength of the hardened concretes was between 31.3-59.8 MPa. Furthermore, the analysis of variance (ANOVA) results showed that the most significant factor affecting the initial setting time of the fresh concretes was the retarder dosage, and its contribution percentage was 62.66%. On the other hand, the ANOVA results show that the most significant factor affecting the 28-day compressive strength of the hardened concretes was the water to binder ratio, and its contribution percentage was 79.05%.

• 한국의류학회지
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• 제39권3호
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• pp.457-467
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• 2015

The demand for coverall-type protective clothing are increasing in many industrial fields; however, it is impossible to evaluate the wearers' apparel fit because there is no commercialized pattern in the market. This study produces a manual for the process of acquiring patterns by separating PPE products into pieces to provide information on acquiring patterns. The analysis was on coverall-type non woven protective clothing in the domestic market, and 4 panels examined the validity, reliability, and efficiency of various possible methods on each step of process. Five steps were conducted to acquire patterns removing wrinkles, marking seams lines, separating seams, and pattern completing. The process of converting these into pattern files was designed through three procedures of digitizing, editing, and exporting and detailed stages. Fitting tests were undertaken, real patterns by actual modeling and pattern files by virtual modeling; all showed similar forms with outfits wearing ready-made protective coveralls. This study sought the most efficient and objective method of virtual modeling and proposed it as a manual. It is expected for the pattern reverse-designing manual through products analysis presented in this study that would be a helpful addition of information to the pattern tracing of pattern-less clothing products.

• International Journal of Naval Architecture and Ocean Engineering
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• 제7권6호
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• pp.964-978
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• 2015

Numerous experiments with a scaled pilot facility were carried out to compare the relative bulk transfer performance of three special devices for applications to drilling systems. The pipe diameter for bulk transportation was 3 in., which corresponds to around half of the actual system dimensions. Two different pressures, 3 and 4 bar, were considered to check the relative performance under different pressure conditions at a bulk storage tank. And to make a practical estimation method of the bulk transfer rate at the early design stages of the bulk handling system, a series of experiments were conducted for real scaled bulk handing systems of two drilling vessels. The pressure drops at each pipe element as well as the bulk transfer rates were measured under different operating conditions. Using the measured results, the friction factor for each pipe element was calculated and a procedure for transfer rate estimation was developed. Compared to the measured transfer rate results for other drilling vessels, the estimated transfer rates were within a maximum 15% error bound.

• 실천공학교육논문지
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• 제11권2호
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• pp.159-165
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• 2019

공학교육인증제도 아래 기초설계-요소설계-종합설계의 3단계의 교육체계로 시행되고 있는 공학설계교육 중, 기초설계에 서는 설계 개념, 절차의 공학 입문자에의 소개와 동시에 종합설계에 연결하여 효과적으로 사용되도록 수학적인 상세 설계보다는 창의성이 발휘된 설계안을 창안, 평가하는데 중점을 두고 이를 팀 활동을 통해 연습시킨다. 본 연구에서는 기초설계를 수강하고 종합설계를 수행하고 있는 기계 분야 학생들의 의견을 설문을 통해 수집하여 효과적인 기초설계 교육이 이루어지고 있는지 알아보았다. 전반적으로 학생들이 기초설계 교육의 중요성을 높게 인식하며 유용도도 높다고 인식하고 있으며, 교과 내용별 중요도 및 유용도, 교육기반 및 환경, 종합설계와의 연계 필요성 등 기타 평가사항들이 앞서 있었던 기계 분야 교수들에 대한 설문 결과와도 상당히 일치하고 있다. 학생들과 교수들의 인식이 잘 공감되고 있으며 실제 종합설계시 팀 활동과 아이디어 창안 등이 잘 활용되고 있는 것으로 미루어 기초설계 교육이 효과적으로 이루어지고 있음을 확인할 수 있었다. 다만, 유용도가 중요도에 비해 약간 낮게 인식되는 점은 실습 과제를 흥미롭고 현실적인 것으로의 지속적 향상, 종합설계 초기에 기초설계 습득 내용이 응용되도록 유도하는 등의 유용도를 더 높이기 위한 방안과 노력이 필요하다는 것을 보여준다.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제5권3호
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• pp.200-205
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• 2005

The objectives of this study were to introduce the easiest and most proper applications of datamining in industrial processes. Applying datamining in manufacturing is very different from applying it in marketing. Misapplication of datamining in manufacturing system results in significant problems. Therefore, it is very important to determine the best procedure and technique in advance. In previous studies, related literature has been introduced, but there has not been much description of datamining applications. Research has not often referred to descriptions of particular examples dealing with application problems in manufacturing. In this study, a datamining roadmap was proposed to support datamining applications for industrial processes. The roadmap was classified into three stages, and each stage was categorized into reasonable classes according to the datamining purposed. Each category includes representative techniques for datamining that have been broadly applied over decades. Those techniques differ according to developers and application purposes; however, in this paper, exemplary methods are described. Based on the datamining roadmap, nonexperts can determine procedures and techniques for datamining in their applications.

• 디지털융복합연구
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• 제14권4호
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• pp.43-53
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• 2016

키네틱 교육(Kinetic education)은 모션을 인식하는 디지털 기기인 체감형 게임기(motion based game device)를 사용하여 교육행위에 운동성을 접목하는 융합형 교육방안이다. 본 논문은 키네틱 교육의 필요성과 의미를 탐색하고, 영미문학 서사 교육, 전신반응 활동에 기반을 둔 스토리텔링(Total Physical Response-Storytelling) 교수법의 특성을 상보적으로 결합시켜 새로운 방식의 디지털교육 콘텐츠의 방향성을 제안해보고자 한다. 이러한 '영문학 기반 키네틱 교육 콘텐츠' 기획을 위한 구체적인 방안과 예시는 '아기돼지 삼형제'(The Story of the Three Little Pigs) 동화를 활용하여 1) 어린이 영문학 작품 선정 및 분석, 2) 콘텐츠 프로토타입 설계 및 개발, 3) 동작 데이터베이스 구축 세 단계로 구분하여 제시하였다. 본 연구는 서사문화 교육과 스토리텔링의 문화콘텐츠 개발을 위한 새로운 융합적 모형을 제안할 것으로 기대된다. 영문학 서사 기반의 키네틱 콘텐츠의 교육적 연계성과 인문학적 가치를 부연하였다.