• Proceedings of the KSR Conference
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• 2008.06a
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• pp.603-609
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• 2008

Nowadays, double-system of TFM(Track-side Functional Modules) developed instead of single-system in use of high speed line to acquisition more availability. Safety Law for Railroad recommend to quality certification of development and general railway machines. It is important to select metrics which form the bases for testing software products. A number of package software development part do not open source cords, so testing external characteristic vectors having relationship with metrics. In this paper, review the process for the TFM Point Modules, Universal Modules and Switchers, think about the test methode of circuit boards output performance by using TFM tester and Simulators.

• Fire Science and Engineering
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• v.23 no.5
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• pp.17-23
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• 2009

Moisture evaporates, when concrete is exposed to fire, not only at concrete surface but also at inside the concrete to adjust the equilibrium and transfer properties of moisture. The equilibrium properties of moisture are described by means of water vapor sorption isotherms, which illustrate the hysteretical behavior of materials. In this paper, the prediction method of the moisture distribution inside the concrete members at fire is presented. Finite element method is employed to facilitate the moisture diffusion analysis for any position of member. And the moisture diffusivity model of high strength concrete by high temperature is proposed. To demonstrate the validity of this numerical procedure, the prediction by the proposed algorithm is compared with the test result of other researcher. The proposed algorithm shows a good agreement with the experimental results including the vaporization effect inside the concrete.

• Journal of the Korea Concrete Institute
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• v.25 no.2
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• pp.225-232
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• 2013

The recent worldwide trend in construction industry tends to put emphasis on the performance based design which focuses on the suggestion of the performance of final products rather than method and procedures. A proper model should be employed when predicting the concrete strength, which reflects the material age, in order to verify the function of concrete structures and their materials. Accordingly, this paper proposes the concrete strength development constant (${\alpha}_{sc}$) reflecting the characteristics of domestic materials and then evaluates its suitability.

• Computational Structural Engineering
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• v.10 no.4
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• pp.143-154
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• 1997

Astochastic finite element model which reflects both the effect of discontinuities and the uncertainty of material properties in underground rock mass has been developed. Latin Hypercube Sampling technique has been mobilized and compared with the Monte Carlo simulation method. To consider the effect of discontinuities, the joint finite element model, which is known to be suitable to explain faults, cleavage, things of that nature, has been used in this study. To reflect the uncertainty of material properties, multi-random variables are assumed as the joint normal stiffness and the joint shear stiffness, which could be simulated in terms of normal distribution. The developed computer program in this study has been verified by practical example and has been applied to analyze the circular cavern with discontinuous rock mass.

• Annual Conference on Human and Language Technology
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• 2011.10a
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• pp.133-135
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• 2011

본 논문은 다중 도메인 대화 시스템에서 사용자의 발화에 가장 적합한 도메인을 결정하는 방법에 관하여 논한다. 다중 도메인 대화 시스템 구축 시, 도메인의 확장성 재고 및 각 도메인 별 특성의 효과적인 적용을 위해, 각 도메인 별 단일 도메인 대화 전문가를 구축하고, 다수의 도메인 대화 전문가들을 통합함으로써, 다양한 도메인을 처리할 수 있는 대화 시스템을 구축할 수 있다. 이 때, 자연스러운 대화 처리를 위해서 주어진 사용자의 발화에 가장 적합한 도메인을 결정하는 기술이 필요하다. 본 논문에서는 사용자 발화의 의도 분석 결과 및 이전 사용자 발화 도메인 정보를 이용하는 구축된 분류 모델에 기반한 도메인 결정 방법을 제안하고, 실험 결과를 통해 제안된 방법의 효과를 검증한다.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.225.2-225.2
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• 2012

저궤도 관측용 다중 카메라를 통해 고해상도 위성을 제공할 수 있으며, 지도 제작이나 환경, 농업, 해양 지역 모니터링 등의 목적으로 사용될 수 있다. 특히 항공촬영 및 지구 관측을 통해 수치표고모델(DEM) 추출을 함으로써 촬영지역의 고도정보를 포함하는 입체영상을 얻는데 유용하다. 또한, 달 관측을 위한 관측위성에 장착할 경우 달 표면의 지형을 정밀하게 얻어내어 달표면 고도 지형 지도제작 및 향후 달 탐사선을 통한 달 탐사 시 탐사지역 선정에 필요한 정보를 제공할 수 있다. 다중 카메라를 포함한 탑재체 시스템은 크게 광학부와 카메라 전자부로 구성된다. 광학부에서는 입체촬영 및 줌인이 가능한 광학계를 제공하며, 카메라 전자부에서는 광학계를 통해 검출기로 입사되는 빛에너지를 전자신호로 변환하고, 이를 카메라 전자부 영상출력 형식으로 변환하게 된다. 특히, 다중카메라를 각각 제어하기 위한 정밀제어로직, 다양한 촬영 지원 모드, 다중카메라 영상자료 및 영상처리를 위한 추가적인 영상정보를 제공한다. 본 논문에서는 저궤도 관측용 다중 카메라를 이용한 다양한 활용에 따른 각 모드별 성능분석방법을 제안한다. 이를 위해 각 촬영조건에 따라 필요한 파라미터를 분석하고 실제 활용시 예상되는 성능을 분석해 본다. 또한 다중카메라를 통해 얻어진 영상을 처리하는데 필요한 처리 과정 및 처리된 영상을 활용하는 방법을 제시한다. 특히 다중 카메라 촬영을 통해 얻어진 영상데이터의 특성을 알아보고, 이를 보정 및 처리하기 위해 필요한 추가 적인 정보, 영상파라미터, 처리 단계 및 최종결과물을 검증하는 방법을 제시한다.

• The Transactions of the Korean Institute of Power Electronics
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• v.10 no.4
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• pp.363-372
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• 2005

This paper presents an improved sensorless vector control system for high performance induction motor drives fed by a matrix converter with non-linearity compensation. The nonlinear voltage distortion that is caused by commutation delay and on-state voltage drop in switching devices is corrected by a new matrix converter model. A Reduced Order Extended Luenberger Observer (ROELO) is employed to bring better response in the whole speed operation range and a method to select the observer gain is presented. Experimental results are shown to illustrate the performance of the proposed system.

• The Transactions of the Korea Information Processing Society
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• v.4 no.7
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• pp.1781-1787
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• 1997

Future high speed networks are expected to use the Asynchronous Transfer Mode(ATM), which provides desired quality of service for the various traffic types(e.g., voice, video and data). Proper traffic control scheme helps ensure efficient and fair operation of networks. In this paper, we analyze various related traffic-control strategies and propose a new traffic control scheme and ATM control architecture with an integrated buffer management method and multi-thresholds in order to solve the problem of each class's cell loss ratio and cell delay in ATM networks. In addition, we evaluate the performance improvement of the proposed traffic control scheme through simulation. As shown in the result, the proposed traffic control scheme improves cell loss ratio in proportion to the buffer size.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.26 no.6_spc
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• pp.680-686
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• 2016

In an optical disc archive system, disc insertion process is an important part. Furthermore, dynamic analysis with the contact area between multi-bent leaf spring and a disc should be considered because the contact area is moved when the disc is inserted into the cartridge. In this paper, a finite element model of disc insertion was constructed based on dynamic characteristics, vertical stiffness, and dynamic response. The disc insertion model was validated with the experimental results. To identify the dynamic response of the disc induced by the changed contact area, applied force to the disc and the stiffness of the multi-bent leaf spring were analyzed. As the results, the factors which cause the failure of the disc insertion were investigated.

• Journal of Internet Computing and Services
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• v.10 no.6
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• pp.191-203
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• 2009

Simulation is the work that identifies the characteristics of some problem through the simulated experiments. During the experiments it is frequently required to change or replace the simulation models, algorithms, or input/output data. Especially, in the case of the simulation works performed by replacing algorithms, if a replaceable component that implements a specific algorithm is not correct with respect to its functionality it is very difficult to carry out the simulation works successfully. In this paper, we suggest a test framework that verifies functional correctness of the replaceable component in the software-based GNSS (Global Navigation Satellite System) simulation environments. When a component is replaced, this framework enables us to properly execute the functional test for the component according to its context.