• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.05a
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• pp.404-409
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• 2007

To change rail tracks from main track to another track, it needs some device that is called turnout point. If the point which is composed of accurate parts and complex sensors does not work, serious problems will be arisen. However, there serious problems by the failure of the point. In this paper, after analyzing the failures of the conventional points, a new point is presented. The proposed point is not affected by surge caused by lighting.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.273-281
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• 2010

To install turnout on the main line of high speed railway running 300km/h, measures of rail destressing of existing line, speed-up plan, shortening the installation time and other important technical measures should be considered to reduce the inconvenience of passenger. In particular, for the newly constructing Ohsong and Kimcheon-Gumi station in KyongBu high speed line, it must be difficult to install divided turnout part because it should be done within short night block out hours (6 hours per day) and KTX trains are safely serviced just in time, which is not only the first time in the domestic and but also very rare practical experience in the world. This thesis is covered with experienced work conditions, required equipments and various safety measures, etc.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.25-27
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• 2001

본 논문에서는 AE32000 프로세서에 적응 가능한 효율적인 분기 예측 기법에 관하여 연구하였다. 실험결과, 내장형 응용분야에서의 비용 효율성이란 측면에, AE32000 프로세서에서는 1비트의 분기 예측기와 한 개의 엔트리를 갖는 BTB(Branch Target Buffer)를 사용하는 것이 가장 적합함을 관찰하였다. 또한, 분기 목적 주소에서 나타나는 LERI 명령을 폴딩하여 분기 손실을 줄이는 방안은, BTB와 LERI 폴딩 유닛을 사용하는 설계에서, 가져오는 성능 향상이 미미함을 확인하였다.

• Journal of the Korea Society of Computer and Information
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• v.14 no.10
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• pp.1-10
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• 2009

Precise branch predictor has a profound impact on system performance in modern processor architectures. Recent works show that prediction latency as well as prediction accuracy has a critical impact on overall system performance as well. However, prediction latency tends to be overlooked. In this paper, we propose Branch Pre-Prediction policy to tolerate branch prediction latency. The proposed solution allows that branch predictor can proceed its prediction without any information from the fetch engine, separating the prediction engine from fetch stage. In addition, we propose newly modified BTE structure to support our solution. The simulation result shows that proposed solution can hide most prediction latency with still providing the same level of prediction accuracy. Furthermore, the proposed solution shows even better performance than the ideal case, that is the predictor which always takes a single cycle prediction latency. In our experiments, IPC improvement is up to 11.92% and 5.15% in average, compared to conventional predictor system.

• Proceedings of the KSR Conference
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• 2002.10a
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• pp.633-641
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• 2002

Wooden-sleeper, which has been adopted as railway turnout in Korea, has created many problems such as short life span and increase of maintenance cost. Especially turnout on Maintenance Free slab track, which has been used in city metro, has been constructed with wooden sleeper buried in concrete roadbed due to complexity of structure. However, such problem as rapid erosion in subground makes it difficult to maintain the sleeper because of frequent replacement required. Therefore, the objective of this paper is to introduce design and construction of reinforced concrete(R.C) sleeper for turnout on the concrete roadbed to facilitate maintainability and economic construction of turnout.

• 전기의세계
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• v.44 no.9
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• pp.28-37
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• 1995

외부 광스위치/변조기로는 차단형(cut-off type)[1], 균일 방향성 결합기(uniform directional coupler)[2-4], Mach-Zehnder 간섭계(Mach-Zehnder interferometer)[5-7], 교번 .DELTA..betha. 방향성 결합기(alternation directional coupler)[8-9], 교차 결합기(crossed coupler[10-11], Y-분기 방향성 결합기(Y-branch directional coupler)[12-14] 등의 여러가지가 연구되어졌다. 본 논문에서는 위에서 열거한 여러 가지 광변조기를 해석, 설계하는데 기본이 되는 광결합 이론으로 normal mode 이론과 coupled mode 이론을 소개한다. 아울러 이러한 이론들을 이용하여 전술한 변조기 중 균일 방향성 결합기, Y-분기 방향성 결합기, Mach-Zehnder 간섭계의 광스위칭/변조 원리를 살펴본다.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06b
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• pp.150-152
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• 2012

일반적으로 테스트 데이터 자동 생성을 지원하기 위해 심볼릭 실행기나 제약 해결기와 같은 도구를 요구한다. 그러나 이와 같은 도구들을 개발하는 것은 상당한 노력이 요구되는 것도 사실이다. 이 논문에서는 이러한 도구들의 지원 없이 분기 커버리지를 효과적으로 달성할 수 있는 테스트 데이터 생성 방법을 제안한다. 이를 위해 경로 지향 테스트 데이터 생성을 위해 개발된 Korel의 방법을 확장하여 프로그램의 분기들을 가능한 많이 실행할 수 있는 테스트 데이터를 효과적으로 생성하는 방법을 제안한다.

• Journal of Korean Society of Steel Construction
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• v.21 no.6
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• pp.563-574
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• 2009

This paper briefly describes the fundamental strategies--path-tracing, pin-pointing, and path-switching--in the computational elastic bifurcation theory of geometrically non-linear single-load-parameter conservative elastic spatial structures. The stability points in the non-linear elasticity may be classified into limit points and bifurcation points. For the limit points, the path tracing scheme that successively computes the regular equilibrium points on the equilibrium path, and the pinpointing scheme that precisely locates the singular equilibrium points were sufficient for the computational stability analysis. For the bifurcation points, however, a specific procedure for path-switching was also necessary to detect the branching paths to be traced in the post-buckling region. After the introduction, a general theory of elastic stability based on the energy concept was given. Then path tracing, an indirect method of detecting multiple bifurcation points, and path switching strategies were described. Next, some numerical examples of bifurcation analysis were carried out for a trussed stardome, and a pin-supported plane circular arch was described. Finally, concluding remarks were given.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.39 no.10
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• pp.43-47
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• 2002

A simple optical signal to noise ratio monitoring method using fiber Bragg grating is proposed for monitoring performance of OADM. OSNR of each channel is determined by monitoring the optical power transmitted and reflected from fiber Bragg gratings, simultaneously. We have obtained OSNR with accuracy better than 0.8㏈ compared with OSA of 0.1nm optical resolution in the wide input power range between -6 ㏈m and -23㏈m per channel.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2000.05a
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• pp.156-159
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• 2000

A new analysis method of Tap-Off for CATV, DBS, CS systems was proposed and investigated by using 4-port and Lport equivalent circuits. As an analysis method the even$.$odd-mode theory for a symmetrical coupled-line directional coupler was introduced, and then it was applied to transformer type directional couple By comparing the results of simulation and measurement, the validity of the proposed analysis method was confirmed. Furthermore, the Tap-off has been broadened from 5 MHz to 4,000 MHz by adopting the propose theory.