• The Journal of the Convergence on Culture Technology
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• 제5권1호
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• pp.275-280
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• 2019

Roger Deakens is one of the best director of photography in the world. He has been worked with Joel Coen & Ethan Coen since (1991). He was nominated for Academy award 13 times. At last, he won the 2018 Academy Award for Best Pictures of the Year. This article aim to look at his style of photography, which he has consistently pursued, and how he controls and implements light. Focusing on The Assassination of Jess James by the coward Robert Ford>,, .

• Journal of the Korean Society for Precision Engineering
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• 제32권11호
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• pp.961-968
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• 2015

This study aims to develop an efficient mold structure for the injection molding of a subminiature lens, using shell-type runners instead of traditional cylindrical runners. While the shell runner has the advantage of shorter cooling time due to its thinner geometry, this smaller thickness causes an increase in injection pressure. In this study, the design of the shell runner was modified to contain multiple holes for the purpose of reducing injection pressure. Numerical analyses were performed for shell runners of various hole-shapes, and the resulting filling and cooling characteristics were discussed; the rhombic hole showed the best result for both filling and cooling characteristics. Subsequently, injection molding experiments were performed using an injection mold fabricated based on the rhombic design. The lens parts were successfully molded with highly-reduced cycle time and without degradation of part quality.

• Journal of the Korean Society for Precision Engineering
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• 제25권10호
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• pp.144-149
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• 2008

Configuration of filling imbalance which is originated from imbalanced share rate of melt on runner is changed by runner layout, runner shape, material property, injection pressure, injection speed, melt temperature and mold temperature. In this paper, we conducted a study of runner layout and shape that are main factors of filling imbalance. Other factors such as the sharp corner effect and the groove corner effect are recently released were also considered. The results of study are showed that filling rate of between inside and outside cavity was influenced on shape of runner. Especially, this study suggests a new runner system for filling balance by adapting the two effects of unary branch type runner at multi cavity mold and theoretical investigated flow in the sharp corner type runner.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.706-709
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• 2005

Despite geometrical balanced runner system, filling imbalances between cavity to cavity have always been observed in multi-cavity injection mold. These filling imbalances are results from non-symmetrical shear rate distribution within melt as it flows through the runner system. It has been possible to decrease filling imbalance by optimizing processing conditions, but it has not completely eliminated this phenomenon during the injection molding processing. This paper presents a solution of these filling imbalances by using runner core pin which creates a symmetrical shear distribution within runner and the effects on filling imbalance when modifying a shape of runner core pin. As a result of using runner core pin, a remarkable improvement in reducing filling imbalance was confirmed. In addition we investigated how filling imbalances were affected by shape of runner core pin.

• Journal of Advanced Marine Engineering and Technology
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• 제32권5호
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• pp.698-706
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• 2008

Performance improvement of Small hydro turbine is a very important subject to solve in the stage of introduction and development of the turbine. Cross-flow hydro turbine should be also studied more in detail for the turbine performance in order to extend the sites of application. In order to improve the turbine performance, the effect of the turbine shape on the turbine performance should be examined. Therefore, the effect of runner blade number on the turbine performance is investigated by use of a commercial CFD code. The results show that runner blade number gives remarkable effect on the efficiency and output power of the turbine. Pressure on the surface of the runner blade changes considerably by the blade number at Stage 1, but relatively small change of velocity distribution occurs in the flow passage.

• Proceedings of the KIEE Conference
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.594-595
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• 2015

본 논문에서는 직류차단기 내부 아크 러너 구조에 따라 아크에 작용하는 구동력 차이에 대한 연구를 수행하였다. 컴퓨터 시뮬레이션을 통해 아크 러너 기울기를 변화에 따라 아크 구동력을 계산하였으며, 결과 값들에 대한 비교 분석을 통해 아크 구동력 차이의 발생을 확인하였다. 구동력 차이의 발생 원리를 알아보고 아크구동력 향상 방안에 대해 연구하였으며, 결과 방안을 차단시간 단축 요소로써 활용할 수 있을 것으로 기대한다.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• 제8권6호
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• pp.64-70
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• 1999

Family injection molding of plastic is widely used to enhance productivity. Runners for molded products in fami-ly injection molding have to be balanced so that each of the producs is filled completely at the same time,. In this study computer simulations were performed to determine balanced circular section runners in family injection molding with two cavities where each of he cavity shapes is like a case. It was found from the computer simula-tions that runner balance could be fulfilled only by modifying runner diameters. But in order to get more quality molded products other process factors such as flow length flow resistance shapes of products and etc, should be taken in to consideration for the design of a family injection molding process.

• Proceedings of the Korean Information Science Society Conference
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• 한국정보과학회 2012년도 한국컴퓨터종합학술대회논문집 Vol.39 No.1(B)
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• pp.258-260
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• 2012

본 논문은 오픈소스 자바 어플리케이션인 JTopas를 대상으로 단위 메소드 테스트를 수행하고, 기존의 IDE 중심의 JUnit 테스트 환경이 아닌 텍스트 UI 테스트 러너 기반으로 테스트를 수행함으로써 얻는 효과를 기술한다. 또한 리눅스 환경을 활용하여 쉘 프로그램으로 테스트 실행 프로그램을 작성하였으며, 이를 통하여 테스트 실행 결과 분석을 용이하게 할 수 있다. 동시에 테스트 코드와 테스트 대상 소스 코드를 관리하는 패키지 구성 방법을 보임으로써, TDD등에서 요구하는 테스트 코드 작성과 소스 코드 작성을 동시에 수행하는 환경을 지원하는 효과가 있다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 한국정밀공학회 2003년도 추계학술대회 논문요약집
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• pp.281-281
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• 2003

• Proceedings of the Korean Society of Precision Engineering Conference
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.1201-1202
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• 2011