• 한국막학회:학술대회논문집
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• 한국막학회 1997년도 춘계 총회 및 학술발표회
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• pp.34-35
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• 1997

The phase inversion is a significant phenomena in the preparation of membranes and wet spinning. In both these processes, a viscous dope solution is precipitated in a nonsolvent bath and a porous structure is formed under certain conditions. Such structure could have been considered as a diffusion controlled process. The membrane formation of the polymer solution includes both phase separation and gelation. We have studied the influence of variables on the final structure and tried to control the porosity and ultrafiltration(UF) performance of the polyacrylonitrile(PAN) and its copolymer.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.646-647
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• 2007

The topology processor uses the status of circuit breakers as input. It operates on the bus section connectivity data, which is stored in the data base, to determine the bus/branch topology of the network. This output of the topology processor forms part of the input to the state estimation or dispatcher power flow. This paper describes the development of the topology processor using matrix structure.

• 산업경영시스템학회지
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• 제23권60호
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• pp.47-55
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• 2000

Two experiments were conducted to examine the relationships between the color structure and the user preference of a CNS (Car Navigation System) digital map in terms of HSE (Human Sensibility Ergonomics). In the first experiment, the user's preference of color structures were investigated from the subjects' self-designed digital maps using a CNS digital map UIMS (User Interface Management System): in the second, statistical relation models between the user's color structure satisfaction level and the color components of CIE (Commission Internationale de ι'Eclairage) of the real products were suggested. For each experiment, CIE L*u*v* and CIE LCH color space were adapted, respectively, because they have their own characteristics of perceptual uniformity which enables the color components to transform a linear function.

• Journal of the Korean Wood Science and Technology
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• 제35권2호
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• pp.9-15
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• 2007

A comparative study of the structure and organization of the primary and secondary walls in different types of tropical plant waste fibers was carried out using transmission electron microscopy (TEM). The thickness of each layer was also measured using Image Analyzer. TEM micrographs haveconfirmed that cell wall structure of all six types of tropical plant waste fibers (empty fruit bunch, oil palm frond, oil palm trunk, coir, banana stem and pineapple leaf) has the same ultrastructure with wood fibre. The fibers consisted of middle lamella, primary and thick secondary wall with different thickness for different types of fibers. The secondary wall was differentiated into a $S_1$ layer, a unique multi-lamellae $S_2$ layer, and $S_3$ layer.

• 산업공학
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• 제17권2호
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• pp.169-179
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• 2004

In supply chain management, supplier capacity is very important to meet the customer demand quickly. This paper studies a supplier evaluation structure and then suggests a methodology using fuzzy theory for selecting an effective supplier. Several quantitative and qualitative evaluation factors should be analyzed in the evaluation structure. The qualitative factors includes not only product and service qualities but financial condition. The methodology deals with both the quantitative and qualitative factors together through fuzzy inference. A case study is also presented to show how to choose the best one among potential suppliers.

• Industrial Engineering and Management Systems
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• 제3권2호
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• pp.123-128
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• 2004

A tree structure model has been proposed for representing the unequal-area facility layout. Each facility has a different rectangular shape specified by its area and aspect ratio. In this layout problem, based on the assumption that the shop floor has enough space for laying out the facilities, no constraint is considered for a shop floor. Objectives are minimizing total part movement between facilities and total rectangular layout area where all facilities and dead spaces are enclosed. Using the genetic code corresponding to two kinds of information, facility sequence and branching positions in the tree structure model, a genetic algorithm has been applied for finding non-dominated solutions in the two-objective layout problem. We use three kinds of crossover (PMX, OX, CX) for the former part of the chromosome and one-point crossover for the latter part. Two kinds of layout problems have been tested by the proposed method. The results demonstrate that the presented algorithm is able to find good solutions in enough short time.

• 기술혁신연구
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• 제6권2호
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• pp.32-53
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• 1998

This paper analyzes the characteristics of embodied technological knowledge structure of Korean manufacturing in dynamic perspective. In doing that, the concept of the embodied knowledge network is introduced which is defined as a set of industries and their interactions(embodied knowledge flow) or linkages. The analysis of the inter-industrial embodied knowledge flows is conducted by using such methodologies as input-output technique, network analysis, indicator analysis and correlation analysis for a set of empirical data with reference period of 1983-1990. The main findings are as follow. First, as a whole, the structure of embodied knowledge flow can be classified into knowledge outflow sectors, inflow sectors and intermediary sectors. Second, outflow sectors exhibit a multi-central structure whereas inflow sectors form a dualistic structure. These idiosyncratic characteristics should be addressed in developing industrial policy.

• 대한공업교육학회지
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• 제34권2호
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• pp.20-41
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• 2009

이 연구는 공업교육학의 학문적 기반이 될 공업교과 교육의 정체성 차원에서 공업교과 교육학의 개념 구조를 제안하기 위하여 수행되었다. 이 연구는 문헌 연구에 바탕을 두고 수행되었다. 이 연구의 결론은 다음과 같다. 첫째, 공업교과 교육의 개념은 기능 기술과 엔지니어링 응용 능력을 가진 공업기술인을 기르기 위하여 공업 기술의 지식체계에 근거한 시스템을 설계하고, 제작하고, 평가하고, 고장해결 하는 일련의 엔지니어링 과정활동에 기초한 실천적 학습 방법을 통하여 창조적 문제해결을 경험하는 교과교육으로 정의하였다. 둘째, 공업교과 교육의 성격은 교육 목표의 관점에서 직업 능력 교과, 지식 구조의 관점에서 실천적 지식 교과, 교육 방법의 관점에서 시스템 설계와 엔지니어링 맥락에서의 기술적 문제해결 교과로 제시하였다. 셋째, 공업교과 교육의 개념적 모형은 공업교과 교육의 개념 정의에 따라 교육의 목적, 내용, 방법을 논리적인 부수 관계로 도식화하고, 이 구조를 바탕으로 공업교과 교육의 세 가지 성격 요소를 관련지어 나타내었다. 공업교과 교육학의 이론적 틀은 교과에 대한 내용적, 설명적, 교육적 이해의 관점에서 구조화하였다.

• 대한산업공학회지
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• 제27권1호
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• pp.30-36
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• 2001

We present a new algorithm for mining association rules in the large database. Association rules are the relationships of items in the same transaction. These rules provide useful information for marketing. Since Apriori algorithm was introduced in 1994, many researchers have worked to improve Apriori algorithm. However, the drawback of Apriori-based algorithm is that it scans the transaction database repeatedly. The algorithm which we propose scans the database twice. The first scanning of the database collects frequent length l-itemsets. And then, the algorithm scans the database one more time to construct the data structure Common-Item Tree which stores the information about frequent itemsets. To find all frequent itemsets, the algorithm scans Common-Item Tree instead of the database. As scanning Common-Item Tree takes less time than scanning the database, the algorithm proposed is more efficient than Apriori-based algorithm.

• 한국경제지리학회지
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• 제6권2호
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• pp.293-306
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• 2003

충북지역은 지역 내 총생산의 이윤부문이 외부로 유출되고 있으므로 기반산업의 육성이 필요한데 이를 위해 주력 제조업은 주 업종으로 석유화학, 반도체 업종을, 부차적인 업종은 자동차 산업으로 하고 이들 업종에 디지털 산업을 결합시켜 고부가가치의 차세대 산업동력으로 발전시켜 나가야 할 것이다. 그리고 충북지역의 지식기반 서비스업인 교육 서비스와 보건복지 및 연구개발 서비스업은 정밀화학, 생물산업의 주 업종과 부차적인 정밀기기 업종의 지원사업으로 이들 기업간의 네트워크를 형성하고 교육기관과 연계하여 지역혁신체제를 구축하여야 할 것이다.