• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.51.5-51
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• 2001

The sliding and/or skidding motions generally occur to a car - like planar mobile robot consisting of four conventional fixed wheels attached on two parallel axles. Thus, the kinematic model of such mobile robot should include the description of skidding and sliding frictional motions. However, most of previous kinematic models do not take these frictional motions into account the kinematic model, as the work done by Muir and Newman [1]. Thus, does it result in least square solution in estimating sensed forward velocity. In this paper, the sensed forward velocity estimation algorithm for mobile robots is proposed, which not only includes those skidding and sliding frictional motions into kinematic model but also utilizes only the minimal set of dependent internal kinematic variables of the mobile robot. Then, ...

• Transactions on Control, Automation and Systems Engineering
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• 제3권4호
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• pp.210-216
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• 2001

In this paper, design of a 3-degree-of-freedom mobile robot with three caster wheels is performed. Initially, kinematic modeling and singularity analysis of the mobile robot is performed. It is found that the singularity can be avoided when the robot has more than two wheels on which two active joints are located. Optimal kinematic parameters of mobile robots with three active joint variables and with four active joint variables are obtained and compared with respect to kinematic isotropic index of the Jacobian matrix of the mobile robot which is functions of the wheel radius and the length of steering link.

• Structural Engineering and Mechanics
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• 제7권1호
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• pp.69-80
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• 1999

The purpose of this study is to propose an analytical model for the simulation of the hysteretic behavior of RC (reinforced concrete) beam-column subassemblages under various loading histories. The discrete line element with inelastic rotational springs is adopted to model the different locations of the plastic hinging zone. The hysteresis model can be adopted for a dynamic two-dimensional inelastic analysis of RC frame structures. From the analysis of test results it is found that the stiffness deterioration caused by inelastic loading can be simulated with a function of basic pinching coefficients, ductility ratio and yield strength ratio of members. A new strength degradation coefficient is proposed to simulate the inelastic behavior of members as a function of the transverse steel spacing and section aspect ratio. The energy dissipation capacities calculated using the proposed model show a good agreement with test results within errors of 27%.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2009년도 하계학술발표대회 논문집
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• pp.1355-1360
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• 2009

This study simulates the flow characteristics of the turbo-fan which was applied to the industrial scale. Numerical analysis has been carried out to investigate a pulsation behavior of exhaust air that flow out the turbo fan, considering a constant rotating rate of impeller. Moving mesh technique provides time-accurate solutions for the flow inside an impeller. From the numerical results, FFT analysis has been made for pressure pulsations inside turbo-fan casing. The numerical simulation shows the pulsation of model-2 has higher than model. Additionally, BPF value is almost same as the numerical results.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 춘계학술대회 논문집 반도체 재료 센서 박막재료 전자세라믹스
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• pp.64-67
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• 2004

본 논문에서는 DNA를 이용한 나노 소자에 응용하기 위하여, photo-lithograpy를 사용하여 나노크기(<100)의 간격을 갖는 금 전극을 제작하였다. 그리고 제작되어진 되어진 나노 전극위에 2-Amino ethanthiol(AET)를 코팅하여 AET와 $\lambda$-DNA 사이의 정전기적 상호 작용을 이용, 금 나노전극 사이에 간단하고 고착율을 높이는 실험을 하였다. SEM(Scanning Electron Microscope) 분석을 통해 나노 크기의 전극 간격을 확인하였고, 두 전극사이에 연결되어진 $\lambda$-DNA는 AFM(Atomic force microscope)을 확인하였다.

• 한국군사과학기술학회지
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• 제11권3호
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• pp.76-88
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• 2008

The purpose of the research is to propose an earned-value indicator for technical performance measurements of an ongoing defense R&D project and the associated measurement, analysis and the implementation process for data collection and usages. Furthermore, the study demonstrates the evidences of benefits and validity of the proposed approach through the enabling tool development and its application examples.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2011년도 한국컴퓨터종합학술대회논문집 Vol.38 No.1(C)
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• pp.470-473
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• 2011

오류 정적 분석기가 출력하는 분석 경보 사이의 종속 관계를 안전하게 계산하여, 분석 경보들을 무리 짓는 짓고, 대표 경보들만을 출력하는 기법을 소개한다. 경보 1이 가짜 경보일 때 경보 2도 항상 가짜 경보가 된다면, 경보 1을 살펴 가짜 경보임을 안 경우에 경보 2를 살펴볼 필요가 없다. 따라서, 경보 2는 경보 1에 종속적이라고 말할 수 있다. 버퍼 오버런 분석기의 분석 경보 보고서를 개선하기 위해 이러한 기법을 적용한 결과, 여러 개의 오픈 소스 소프트웨어들의 분석 후에 보고되는 경보의 수를 평균 60% 줄일 수 있었다. 종속 관계 계산을 위해 소요되는 추가적인 분석 시간은 평균 20% 이다. 제안하는 기법은 요약 해석에 기반을 둔 모든 정적 분석기에 적용할 수 있으며, 실제 오류일 가능성이 높은 경보를 먼저 보여주는 통계적인 기법들과 독립적으로 사용될 수 있다.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2011년도 한국컴퓨터종합학술대회논문집 Vol.38 No.1(C)
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• pp.450-453
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• 2011

분석 경보에 따른 점층적인 분석을 수행하는 버퍼 오버런 분석 기법을 제안한다. 구간 도메인을 사용한 분석은 비용이 낮지만 정확도도 낮다. 변수들 간의 관계를 고려하는 팔각형 도메인을 사용한 분석은 정확도가 높지만 비용도 높다. 점층적인 분석 방법으로 정적 분석기의 비용과 정확도 사이에서 균형을 잡을 수 있다. 먼저 (비용이 낮은) 구간 도메인을 사용한 분석을 수행하고, 증명하지 못한 부분 코드에 대해서만 (정확도가 높은) 관계 도메인을 사용한 분석을 적용한다. 정확도가 높은 분석이 필요한 부분에만 관계 분석을 적용함으로써, 낮은 분석 비용을 유지하면서 정확도를 높일 수 있다.

• 전력전자학회논문지
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• 제21권6호
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• pp.542-545
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• 2016

This work proposes a capacitive coupling-based wireless battery charging circuit that is built with vehicle glasses for electric vehicles. A capacitive coupling wireless power transfer offers many advantages, such as low metal impact and low energy transfer efficiency changes in accordance with changes in position. However, a large coupling capacitor is needed for high power transfer. Therefore, a new capacitive coupling-based wireless power transfer LLC resonant converter built with the glasses of an electric vehicle is proposed. The proposed converter is composed of coupling capacitors with glasses of an electric vehicle and two transformers for impedance transformation. The proposed LLC converter can transfer large power and obtain high efficiency with zero voltage switching. The validity and features of the proposed circuit is verified by experimental results with a 1.2 kW prototype.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(I)
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• pp.315-318
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• 2005

The objective of this study is to find out discrepancy in ability of bond behavior between Carbon fiber-reinforced polymer(CFRP Plate) and concrete by method of experiment. For the objective, single and double face shear test were tested. From the experimental results, it was analyzed bond strength of FRP to concrete, distribution of stress and strain of FRP. The bond strength and the effective bond length was evaluated by the theory of existing studies. Effective bond length of single face test was smaller than it of double face test.