• Transactions of the Korean Society of Mechanical Engineers A
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• v.24 no.11
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• pp.2823-2827
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• 2000

The dynamic photoelasticity with the aid of Cranz-Shardin type high speed camera system is utilized to record the dynamically propagating behavior of an interface crack. This paper investigates determined the effects of the hole (exited on the path of the crack propagation) on the crack propagation behavior by comparing the experiment isochromatic fringes to the theoretical stress fields.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1955-1956
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• 2008

정보 보안 시스템에 대한 접근을 용이하게 하면서 보다 안전하게 하기위한 하나의 방법으로 생체인식 시스템이 사용되고 있다. 본논문에서는 생체인식 시스템 중 보편적으로 사용되는 융선 방향을 이용한 지문인식 시스템을 구성하고, 디지털 워터마킹 기법을 이용하여 지문에서 추출한 특징점 데이터를 영상에 워터마킹하여 지문 데이터를 보호하는 방법을 제안한다.

• Proceedings of the KSME Conference
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• 2000.04a
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• pp.127-131
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• 2000

The dynamic photoelasticity with the aid of Cranz-Shardin type high speed camera system is utilized to record the dynamically propagating behavior of an interface crack. This paper investigates determined the effects of the hole (existed on the path of the crack propagation) on the crack propagation behavior by comparing the experiment isochromatic fringes to the theoretical stress fields.

• Proceedings of the KSME Conference
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• 2000.11a
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• pp.268-273
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• 2000

Mechanical properties of the materials used for transportations and industrial machinery under high strain rate loading conditions are required to provide appropriate safety assessment to these mechanical structures. The Split Hopkinson Pressure Bar(SHPB) technique, a special experimental apparatus, can be used to obtain the material behavior under high strain rate loading condition. In this paper, dynamic deformation behaviors of the aluminum alloys, Al2024-T4, Al6061-T6 and Al7075-T6, under high strain rate compressive and tensile loading are determined using SHPB technique.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2003.11a
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• pp.63-67
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• 2003

There are many factors that generate the early deterioration of the concrete structure. As the one of the representative factors, we can think an invasion of the water, air and so on. The water and air invade in inside void along the capillarity and they become the cause that the durability like corrosion of layer department due to freezing and thawing, inside steel frame corrosion, and so on blacks. Therefore with covering permeability covering waterproofing material of fluid condition in outer wall, intercepting the deterioration factor due to the infiltration of water from outside and for salt damage of concrete layer department, freezing damage and neutralization, it needs, to improve durability of structure. This study separately examined physical and chemical specific of quality liguid siliceous of waterproofing material. Therefore as this applys the construction site, it improves the durability of concrete structure. Further this presents the application plan from the construction market against the new material.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2003.11a
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• pp.17-21
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• 2003

This study is mainly acceptive for physical material performance than waterproofing layer performance on the external condition after construction. The reason are legalized only for material performance quality standard even though it is existed waterproofing materials for membrane. In actuality, waterproofing layer are greatly occurred in performance a decreased developing essential element that are human footprints as a result physical perimeter environment after construction and on the construction. As the result, this present paper purpose for evaluation and performance of the membrane waterproofing layer on the construction.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.10a
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• pp.243-245
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• 2016

2008년 미국 Hatch 발전소에서 제어시스템 소프트웨어 업데이트로 인한 비상정지, 2010년 이란 원자력시설에서 악성코드 스턱스넷(Stuxnet) 감염을 통한 원심분리기 1,000여개 파괴 등 원자력시설에 대한 사이버공격이 점차 증가하고 있는 상황에서 우리나라도 이와 같은 사고를 예방하기 위한 방안을 강구하여야 한다. 이미 우리나라 원자력시설에서 사용되는 시스템들이 아날로그 방식에서 디지털로 교체되고 있는 등 사이버공격에 용이하게 변화되고 있다. 이에 원전 사고연계 시스템들의 보안성을 평가할 수 있는 환경을 구축함으로써 사이버공격에 대한 보안대책 마련 및 근본적인 방어 체계를 수립하고자 한다.

• Proceedings of the Korean Information Science Society Conference
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• 2000.10a
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• pp.379-381
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• 2000

인터넷의 급속한 발전으로 인터넷 경매와 같은 e-business가 활발해 지면서 사용자의 요구사항도 빠르게 변하고 있다. 급변하는 사용자들의 요구사항을 반영하고 소프트웨어의 경제성, 시장 경쟁력 확보를 위한 방법은 산업계 및 학계에서 많이 거론되고 있다. 최근 EJB(Enterprise JavaBeans) 기반의 컴포넌트 개발은 재사용성을 확보할 수 있는 가장 주목 받는 방안으로 제시되고 있다. 기존의 객체지향에 의한 소프트웨어 개발 방법은 이미 재사용성, 유지보수성, 무결정, 안정성 등의 많은 장점으로 인해 학계와 산업계에서 이미 많이 보편화 되어 있고 널리 이용되어지고 있다. 하지만, EJB에 기반하여 컴포넌트 어플리케이션을 개발하는데 있어서는 그 적용 사례가 드물고 그 활요성 또한 검증된 바가 거의 없다. 따서 본 논문에서는 인터넷 경매시스템에 EJB를 적용해 봄으로써 시스템 개발시의 그 실무적인 유용성을 검증해 본다.

• Journal of Pharmacopuncture
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• v.1 no.1
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• pp.87-102
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• 1997

YAKCHIM is a clinical research of korean O.M.D's in the 1960's, and it was activated by experimental research and organization of the association after 1980. YAKCHIM in Korea is a new technical therapy that used the efficacy of traditional herb and the stimulation of meridian at points by needles. In order to search the original form of YAKCHIM and the significance of development in therapeutic methodology, reger to various documents. The results were obtained as follow : 1. The form of injection in YAKCHIM is a developed form of a aspirator which trace the cupping therapy(附缸) to its origin. 2. The injection techniques that used extracts of oriental herb can be found out original methodology in Bee-acupuncture(蜂針) and snake teeth etc. that have been used in far-eastern area from long time ago. 3. YAKCHIM in Korea is a developed form of techniques which was combined with the meridian theory, in consequence, it is difference with an injection syringe which only used to injection in modern medicine.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 2003.11a
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• pp.185-190
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• 2003

Synchronizer ring performance is strictly required in order to extend manual transmission oil drain interval. Zn type additive, which is used as dispersant and anti-wear additive instead of SP additives in manual transmission oil, is applied to improve Synchronizing function and durability. But only Zn type additive is not suitable for high torque transmission because it has not good extreme pressure characteristics. We research on the synchronizer friction and extreme pressure properties in according to change additive types. As a result, it was found that the use of non-active extreme pressure and friction modifier additives has benefit in the improvement of synchronizer friction characteristics and durability.