• Proceedings of the Korean Information Science Society Conference
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• 2003.04a
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• pp.854-856
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• 2003

웹 기반 교육시스템에 컴포넌트 개념을 도입하여 재사용하는 연구는 소프트웨어 재사용 측면에서 생산성 증대에 기여하지만 이러한 효과가 현실화되기 위해서는 기술적인 제반 요소들, 예를 들면 충분히 많은수의 사용 가능한 컴포넌트의 존재, 검색 및 등록 시스템의 지원, 효과적인 컴포넌트 서술 등의 문제가 해결되어야 하며 이 논문에서는 웹 기반 교육시스템에 컴포넌트 개념을 도입하여 재사용성을 높이는 연구의 연장으로 컴포넌트를 인터넷상에 개방하면서 그 컴포넌트에 대한 검색을 하거나 컴포넌트를 이해하고자 하는 사용자들에게 도움이 되는 정보들이 상세하게 기술되어야 함을 전제로 개발자의 WBI에서 요구 사항에 부합되는 컴포넌트를 검색하기 위한 컴포넌트 명세 모델과 아키텍쳐에 기반한 컴포넌트 검색 모델을 XML형태로 명세하고 클래스 다이어그램으로 표기하는 연구를 하였다.

• Journal of the Korea Institute of Military Science and Technology
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• v.16 no.6
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• pp.771-778
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• 2013

Transmission is a core component of helicopter to transmit power from engine to rotor and must have a endurance to be able to show satisfactorily its performance required during its life time. When developing a new helicopter, both military and civil airworthiness authorities require a tie-down test to verify its endurance. Procedure for transmission endurance test is described in FAR part 29 or US military specification but its details are more or less ambiguous. In this paper, we have proposed a proper procedure for transmission endurance test by giving KUH transmission endurance test example including determination of applicable torque, load and test profile.

• Journal of the Korean Society for Precision Engineering
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• v.20 no.3
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• pp.194-201
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• 2003

This study presents the comparative filtration performance evaluation of automotive fuel filters based on the theory of Beta ratio. For the experiments, the fuel component's test stand incorporating the multi-pass filtration test circuit was developed. A mathematical description of filtration process in general was derived. And the theoretical basis of multi-pass test and the test procedure were described in detail. Experimental results revealed that domestic fuel filter tested could not maintain consistent Beta ratio, that is filtration efficiency, although it had the holding capacity of contaminants close to the specification at maximum pressure drop across the filter assembly. The results of experiments and simulations also showed that filtration system model could be refined including desorption ratio to estimate the variable Beta ratio in service life.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10a
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• pp.498-500
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• 1999

컴포넌트 기반 소프트웨어 공학에서 컴포넌트를 명세하기 위한 명세 언어는 컴포넌트 분류, 검증 및 검색에 가장 기본적인 조건이다. 기존에 이미 많은 명세 언어가 사용되어 왔지만 명세의 복잡성으로 인한 어려움이 있다. 따라서 이 연구에서는 이러한 복잡성과 개발자에게 좀 더 쉬운 명세 방법을 제공하기 위해 XML을 기반으로 하여 새로운 컴포넌트 명세 언어를 제안하였다. 제안한 명세 언어는 컴포넌트의 기능명세부분, 타입 검사에 의한 검색을 위한 부분, 명세 일치 방식을 위한 부분으로 구성된 컴포넌트 기능명세와 소프트웨어 아키텍쳐를 위한 명세로 구성된다. 이 연구에서는 각 부분을 XML 태그에 의해 정의하였다. 또한 소프트웨어 아키텍쳐 명세를 위한 그래픽 표기법과 텍스트 표기법을 제안하였다. 이 연구에서 제안한 명세언어는 화이트박스 재사용과 블랙박스 재사용을 지원하고 오류가능성을 줄일 수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10a
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• pp.495-497
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• 1999

오늘날 소프트웨어는 컴포넌트 기반의 소프트웨어라고 할 수 있다. 새로운 소프트웨어를 개발함에 있어서 컴포넌트를 사용하면 개발 기간과 비용 등 여러 면에서 장점이 있다. 그러나 이러한 컴포넌트 기반의 소프트웨어의 단점은 3자가 개발한 컴포넌트를 사용함에 따른 유지보수의 어려움이다. 제 3자가 개발한 컴포넌트의 경우 관련 문서, 설계 명세, 도움말 등이 존재하지 않는 경우 유지보수가 불가능하거나 아주 어렵게 된다. 이러한 경우 컴포넌트로부터 설계 명세 등의 정보를 추출할 수 있다면 기존 컴포넌트 기반의 소프트웨어를 기능을 향상시키거나 새로운 기능을 추가하는 등의 컴포넌트의 유지보수가 가능하다. 본 논문에서는 자바 빈즈 컴포넌트 모델을 기반으로 한 컴포넌트 명세 추출을 보인다. 자바 빈즈 컴포넌트로부터의 명세 추출은 자바의 리플렉션이나 자바 빈즈의 인트로스펙션 기능을 이용하여 소스 파일이 없이 자바 빈즈 컴포넌트의 클래스 파일만을 가지고 가능하다. 추출된 정보로부터 컴포넌트의 추상적인 설계 명세를 얻을 수 있다. XML은 웹 기반의 마크업 언어로써 구조적, 다중 링크, 자기 서술적, 정확성 등의 장점이 있다. 따라서 본 논문에서는 자바 빈즈 컴포넌트의 명세 표현 형태를 XML을 이용하여 자바 빈즈 컴포넌트 명세의 재사용성, 검색, 효율적인 관리가 가능함을 제시한다.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.1679-1688
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• 2008

Recently, the bogie frame weight of Light Rail Transit system has been reduced in order to save energy and materials. However, this light weighted vehicle structure is very important to verify the fatigue strength at the development stage. Bogie system consists of bogie frame, suspensions, wheel-sets, braking system and transmission system. Among these components, the bogie frame is most significant component subjected to the whole vehicle and passenger loads. In this study, the bogie frame for the New LRT power car is evaluated to the static and fatigue strength. And the evaluation method is used the LRT Performance Test Standards Specification throughout the FEM analysis and static load test. The static and fatigue test results for the LRT bogie frame of power car has been appeared very safety and stable for the design load conditions.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.05a
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• pp.129-130
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• 2023

The compressive strength of concrete is greatly affected by the temperature inside the concrete at the initial age immediately after pouring. In the KCI Concrete Standard Specification, only the temperature correction strength (Tn) according to the curing temperature is applied in the mixing strength calculation formula, and mSn is not considered. The formula based on the Chrino model of the blast furnace slag concrete was calculated, and the strength of the structural concrete and the strength of the water cured specimen in the same mixture were compared with the predicted strength. As a result, the error between the predicted strength and the measured strength was greater in the structural concrete than in the concrete specimen.

• Journal of KIISE:Computing Practices and Letters
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• v.15 no.6
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• pp.454-458
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• 2009

The technology of virtual environments has been developed with better-quality appearance on a computer display in mind, but without consideration for objects' precise measurements in physical units. With the increased application of computer graphics in a variety of areas, there is a need for precise measurement functionality in addition to visualization. This paper describes the definition of physical properties using measurement units for X3D based virtual objects, to provide their precise physical information in virtual environments. To this end, we have included the physical property node in the X3D specification. The physical measurement units, such as length, mass, time, temperature, etc., are based on SI units (International System of Units).

• Bulletin of the Korean Space Science Society
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• 2004.10b
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• pp.347-350
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• 2004

A space radiation analysis has been used to evaluate an ability of electronic equipment boxes or spacecrafts to endure various radiation effects, so it helps design thicknesses of structure and allocate components to meet the radiation requirements. A comparison study of space radiation dose analysis programs SPENVIS Sectoring Tool (SST) and SIGMA II is conducted through some structure cases, simple sphere shell, box and representative satellite configurations. The results and a discussion of comparison will be given. A general comparison will be shown for understanding those programs. The both programs use the same strategy, solid angle sectoring with ray-tracing method to produce an approximate dose at points in representative simple and complex models of spacecraft structures. Also the particle environment data corresponding to mission specification and radiation transport data are used as input data. But there are distinctions between them. The specification of geometry model and its input scheme, the assignment of dose point and the numbers, the prerequisite programs and ways of representing results will be discussed. SST is a web-based interactive program for sectoring analysis of complex geometries. It may be useful for a preliminary dose assessment with user-friendly interfaces and a package approach. SIGMA II is able to obtain from RSICC (Radiation Safety Information Computational Center) as a FOR-TRAN 77 source code. It may be suitable for either parametric preliminary design or detailed final design, e.g. a manned flight or radiation-sensitive component configuration design. It needs some debugs, recompiling and a tedious work to make geometrical quadric surfaces for actual spacecraft configuration, and has poor documentation. It is recommend to vist RSICC homepage and GEANT4/SSAT homepage.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2000.11a
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• pp.1-2
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• 2000

In chip plating, several parameters must be taken into consideration. Current density, solution concentration, pH, solution temperature, components volume, chip and media ratio, barrel geometrical shape were most likely found to have an effect to the process yields. The 3 types of barrels utilized in chip plating industry are the onventional rotating barrel, vibrational barrel(vibarrel), and the centrifugal type. Conventional rotating barrel is a close type and is commonly used. The components inside the barrel are circulated by the barrel's rotation at a horizontal axis. Process yield has known to have higher thickness deviation. The vibrational barrel is an open type which offers a wide exposure to electrolyte resulting to a stable thickness deviation. It rotates in a vertical axis coupled with multi-vibration action to facilitate mixed up and easy transportation of components. The centrifugal barrel has its plated work centrifugally compacted against the cathode ring for superior electrical contact with simultaneous rotary motion. This experiment has determined the effect of barrel vibration intensity to the plating thickness distribution. The procedures carried out in the experiment involved the overall plating process., cleaning, rinse, Nickel plating, Tin-Lead plating. Plating time was adjusted to meet the required specification. All other parameters were maintained constant. Two trials were performed to confirm the consistency of the result. The thickness data of the experiment conducted showed thatbthe average mean value obtained from higher vibrational intensity is nearer to the standard mean. The distribution curve shown has a narrower specification limits and it has a reduced variation around the target value. Generally, intensity control in vi-barrel facilitates mixed up and easy transportation of components. However, it is desirable to maintain an optimum vibration intensity to prevent solution intrusion into the chips' internal electrode. A cathodic reaction can occur in the interface of the external and internal electrode. 2H20 + e $\rightarrow$M/TEX> 20H + H2.. Hydrogen can penetrate into the body and create pressure which can cause cracks. At high intensity, the chip's motion becomes stronger, its contact between each other is delayed and so plating action is being controlled. However, the strong impact created by its collision can damage the external electrode's structure there by resulting to bad plating condition.