• 전자공학회논문지S
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• 제34S권7호
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• pp.9-18
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• 1997

In this paper, we implemented the communication module in the Telephone Network Access Subsystem(TNAS) of the Advanced Communications Processing System(ACPS). We defined some kinds of communication tasks and related resources like several queues which are executed in real-time operating system, and implemented the procedures for processing the user information. Through traffic modeling and simulation, the performance of the Service Processing board Assembly(SPA) is evaluated in the aspets of system utilization and buffer size. The ACPS should accommodate various public networks such as public switch telephone network, packet switchen data network, frame realy netork, and ATM network. The communications module proposed in this paper could be used inthe interface beween the SPA and the High Speed Network Adaptor of other network interface subsystems.

• 한국생산제조학회지
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• 제8권5호
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• pp.90-95
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• 1999

Chucking for workpieces is very important for productivity and efficiency in lathe operations. In point of productivity top jaws of the chuck should be changed as quickly as possible in order to reduce idle times wherever workpieces are regripped. A quick change power chuck which can change top jaws quickly by using a jaw change handle without any assembly/disassembly processes of screws is analyzed for this study. strength and stiffness of top jaws by centrifugal force are considered for the design. Structural analysis for the chuck is executed and the finite element method is introduced using MSC/NASTRAN software. Also, the performance of the chuck is evaluated by experiments.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 춘계학술대회논문집
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• pp.918-923
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• 2007

Currently, automotive industries improve the vehicle performance and reduce the development period of vehicle using each module part for the high quality and performance of vehicles. However each component part doesn't generate the noise and vibration problems, sometime these problems are generated on the assembly status between vehicle chassis frame and each module part. On this study, in order to analysis the dynamic characteristics of a shield door module that is a typical module part of vehicles, the acquisition and evaluation process about the vibration and noise of shield door module is developed. Also the possibility to apply to shield door module of the developed process is verified by the comparison with the dynamic characteristics between plastic and steel module plate.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 추계종합학술대회 논문집
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• pp.97-100
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• 1999

Mobile network applications are growing and this requires a fast and efficient transport method between the BS(Base Station) and the MSC(Mobile Switching Center). One possible solution is to use ATM and a voice CODEC standard which compresses 64kbps voice data to less than 8kbps. The low bit tate and small-sized packets made by the voice CODEC imply that significant amount of link bandwidth would be wasted, if this small-sized packet is carried by one ATM cell. The cell assembly delay increases if one ATM cell is fully filled with the small-sized packets. For the bandwidth-efficient transmission of low-rate, short, and variable length packets in delay sensitive applications, AAL-2 was standardized. This paper evaluates performance of AAL-2 by using voice CODEC standard.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2005년도 학술대회 논문집
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• pp.265-269
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• 2005

Surge protective devices can be divided into three categories based on the circuit assembly: a parallel circuit type that considers the surge current amount within the device, a series circuit type that considers the voltage and single circuit type that uses a single element. However, when assembling SPDs, there are many things including function and safety to be taken into consideration because they are directly related to the performance and safety of the device. In this paper, we executed an experimental comparative study of performance and thermal stability of each SPD type using lightning surge generator and thermal image camera.

• 한국방재학회:학술대회논문집
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• 한국방재학회 2008년도 정기총회 및 학술발표대회
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• pp.529-532
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• 2008

Recently the compound material has interested in using the structural material as the bridge member assembly. It is the lighter material against existing construction material and has excellent durability and economy. The existing floor of bridge has its short period to repair and replace compared to other parts of the bridge with the pavement and the shoe. These deteriorations of usage and safety by aging and corrosion are needed frequent maintenance. The use of compound material as a structural member suggests solve these problems. So this thesis evaluates the static and the fatigue performance for whether there are fiber lamination direction and stress concentration section of FRP floor plate, the compound material.

• 한국정밀공학회지
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• 제20권3호
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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.

• 한국기계가공학회지
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• 제20권5호
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• pp.1-7
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• 2021

In recent years, automated process technology has allowed for the rapid manufacturing of metal parts. Maintaining high product quality is of vital importance during the production of these parts. Surface defects occurring after processing can compromise their assembly precision and performance. In this study, a deburring tool was developed that can remove burrs generated from drilling. Through the evaluation of processing, burrs were completely removed at entrance and exit surfaces. Therefore, this newly developed deburring tool shows better performance than deburring tools currently in use.

• 한국콘텐츠학회논문지
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• 제8권6호
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• pp.82-88
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• 2008

ARM 프로세서는 다양한 임베디드 시스템에서 활용되고 있다. 또한 대부분의 ARM 프로세서는 C 프로그램을 입력으로 받아 GNU gcc 크로스 컴파일 방식을 사용하여 ARM 어셈블리 코드를 생성한다. 또한 생성된 목적코드의 질을 개선하고 효율적인 목적코드 생성하기 위한 다양한 연구가 진행되고 있다. 본 논문에서는 표준 C 프로그램으로부터 ARM 프로세서에 대한 목적코드를 문법-지시적 변환 기법을 이용하여 생성하며 성능평가 결과를 GNU gcc 크로스 컴파일 방식과 비교하여 제시한다. 본 연구에서 제시한 기법은 생성규칙을 확장하는 방법이 GNU gcc 크로스 컴파일러에 비해 간편하고 편리하다.

• 한국문헌정보학회지
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• 제45권3호
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• pp.327-343
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• 2011

본 연구는 국회전자도서관의 품질을 평가하고 개선방안을 수립하기 위하여 평가 도구를 설계하여 품질을 측정하였고, 개선방안 도출을 위해 ISA(Importance-Satisfaction Analysis) 기법을 적용하였다. 국회전자도서관 품질 평가 도구는 선행연구들에 기반하여 콘텐츠, 서비스, 그리고 시스템의 품질 차원으로 구성하였고 각 차원의 세부적인 항목은 선행연구 및 이용자들의 요구사항 분석을 통해 설계되었다. 각 세부 항목에 대한 측정지표에는 DigiQUAL에서 사용하고 있는 중요도와 만족도가 사용되었다. 국회전자도서관 품질 평가는 질문지법을 통해 수집된 이용자 270명의 응답을 사용하여 Excel 2007과 PASW Statistics 18로 분석하였다. 그리고 측정된 품질 평가 값을 사용하여 국회전자도서관 개선방안 수립을 위해 ISA기법을 적용하였고 그 결과 국회전자도서관 품질 차원 및 세부항목들 중에서 유지, 집중, 저순위, 그리고 과잉 품질 영역을 도출하였다.