• 제어로봇시스템학회논문지
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• 제6권5호
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• pp.376-382
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• 2000

A problem of relevant interest to some industries is that of the optimum two-dimensional layout. In this problem, one is given a number of rectangular sheets and an order for a specified number of each of certain types of two-dimensional regular and irregular shapes. The aim is to cut the shapes out of the sheets in such a way as to minimize the amount of waste produced. In this paper, we propose a genetic algorithms using rotation parameters by which the best pattern of layout is found.

• 충청수학회지
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• 제31권4호
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• pp.387-396
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• 2018

Topology may described a pattern of existence of elements of a given set X. The family ${\tau}(X)$ of all topologies given on a set X form a complete lattice. We will give some topologies on this lattice ${\tau}(X)$ using a fixed topology on X and we will regard ${\tau}(X)$ a topological space. Our purpose of this study is to comparison new topologies on the family ${\tau}(X)$ of all topologies induced old one.

• Journal of applied mathematics & informatics
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• 제11권1_2호
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• pp.125-141
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• 2003

This paper treats the conditions for the existence and stability properties of stationary solutions of reaction-diffusion equations of Gierer-Meinhardt type, subject to Neumann boundary data. The domains in which diffusion takes place are of three types: a regular hexagon, a rectangle and an isosceles rectangular triangle. Considering one of the relevant features of the domains as a bifurcation parameter it will be shown that at a certain critical value a diffusion driven instability occurs and Turing bifurcation takes place: a pattern emerges.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.76-76
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• 2007

Several kinds of photo-chromic polymers containing push-pull structure were synthesized and investigated on optical patterning by photo-induced surface relief gratings (SRG) technique. The azobenzene segment was introduced as a functional group for a photo-triggered tran-cis isomerization. Consequently, we have fabricated micro-size regular pattern by one-step process without photo-mask.

• Journal of Advanced Marine Engineering and Technology
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• 제19권1호
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• pp.71-81
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• 1995

In this paper, a new speed control scheme for induction motor drives that regular sampled PWM and harmonic elimination switching pattern over the full range of output speed is presented. The proposed scheme(hybrid scheme) provides three mode and guarantees smooth voltage boost. A detailed description of the scheme, along with the relalization aspect, is described. Moreover, methods of compensating for dead time and optical transmission system of drive signal are proposed and investigated. Finally, experimental investigation of hybrid scheme is presented.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2013년도 추계학술발표대회
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• pp.1061-1063
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• 2013

기존의 많은 빈발 패턴 마이닝은 단일 최소 임계치를 전체 트랜잭션 데이터베이스의 각 아이템에 똑같이 적용하고 빈발 패턴을 마이닝해왔다. 단일 최소 임계치를 설정함으로써, 모든 아이템이 동일한 임계치가 적용되므로 레어 아이템 문제가 발생한다. 한편, 일정 주기마다 발생하는 정규 패턴이라고 한다. 실 세계에서는 빈발한 아이템 뿐만 아니라 주기적으로 발생하는 패턴정보의 필요성이 증가하고 있다. 본 논문은 레어 아이템 문제를 해결하는 빈발한 정규 패턴을 마이닝하는 기법을 제시한다.

• 한국안전학회지
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• 제28권6호
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• pp.57-63
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• 2013

This paper discusses 2D models of beams for simulating the fracture of brittle materials. A simulation of an experiment on a concrete beam subjected to bending, in which two overlapping cracks occur, is used to study the effect of individual beam characteristics and different arrangements of the beams in the overall network mesh. It was found that any regular orientation of the beams influences the resulting crack patterns. Methods to implement a wide range of poisson's ratios are also developed, the use of the mesh to study arbitrary micro-structures is outlined. The crack pattern that are obtained with mesh are in good agreement with the experimental results. Also, numerical simulations of the tests were performed by means of a model, and non-integer dimensions were measured on the predicted mesh damage patterns.

• 한국보건간호학회지
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• 제11권2호
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• pp.83-93
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• 1997

This study was done for the purpose of investigating college students' body weight and health behavior. The subjects for this study were 1421 students obtained by a convenient sampling from one junior college located in Mok-Po. The data were analyzed by self-reporting questionnaire from June 18 to 28, 1996. The data were analyzed by descriptive statistics with SAS program. The results were as followed; Factors of comparatively high contribution to overweight were male students, perception they were healthy. smoking, alcohol drinking, irregular sleep and eating pattern, sleep for 9 hours over, regular exercise, no snack, diet control for weight loss. Factors of comparatively high contribution to underweight were female students. perception they were unhealthy. no smoking and alcohol drinking. irregular sleep and eating pattern. high rate of snack, sleep for 9 hours over. In conclusion overweight and underweight were correlated with seven health habits' and we suggest health education related to seven health habits.

• 센서학회지
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• 제3권1호
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• pp.19-25
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• 1994

KOH와 같은 이방성 식각수용액를 사용하여 직각모양의 볼록한 가장자리를 식각할 때, 언더컷팅에 의해 가장 자리가 뭉개어지는 현상이 나타난다. 그래서 이 현상을 방지하기 위해 mass 패턴을 수정할 필요가 있어 보상법에 관한 실험을 하였다. 가속도센서 소자공간을 고려할 경우 정사각형의 보상구조로 mass를 보상하는 것이 적당하다는 결과를 얻었다. 이 결과를 기초로, SDB 웨이퍼를 이용하여 사각뿔 형태의 mass 보상된 실리콘 압저항형 가속도센서를 제조하였다.

• 대한세포병리학회지
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• 제7권1호
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• pp.92-96
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• 1996

Extrathoracic metastases of thymomas are extremely rare, occurring in less than 2% of cases. We present a case of metastatic thymoma in the liver diagnosed by aspiration biopsy. A fine-needle aspirate from a hepatic mass of a 65-year old man who had a history of malignant thymoma locally invading pericardium was examined. Nests of epithelial cells with few scattered lymphocytes were present. The nuclei of the epithelial cells were round to oval and appeared relatively uniform and regular, with fine chromatin pattern. They had one or two, small but lather conspicuous nucleoli. Unlike previous reports on the findings of the aspiration cytology of thymomas, the characteristic biphasic pattern was not present in this case.