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채흥석,정용환,이명수,신재곤,이경수,Chae, Heungseok,Jeong, Yonghwan,Lee, Myungsu,Shin, Jaekon,Yi, Kyongsu 한국자동차안전학회 2017 자동차안전학회지 Vol.9 No.1
Regulation for the testing and operation of automated vehicles on public roadways has been recently developed all over the world. For example, the licensing standards and the evaluation technology for automated vehicles have been proposed in California, Nevada and EU. But specific safety evaluation scenarios for automated vehicles have not been proposed yet. This paper presents safety evaluation scenarios for extraordinary service permission of automated vehicles on highways. A total of seven scenarios are selected in consideration of safety priority and real traffic situation. Six scenarios are relevant with lane keeping and one scenario is relevant with lane change. All scenarios are developed based on existing ADAS evaluation scenarios and repeated simulation of automated vehicle algorithm. Safety evaluation factors as well as scenarios are developed. The safety factors are based on existing ADAS ISO requirements, ADAS safety factors and current traffic regulations. For the scenarios, a hunter vehicle is needed in addition to automated vehicle evaluated. The hunter vehicle performs multiple roles like preceding vehicle, cut-in vehicle and so on. The hunter vehicle is also automated vehicle equipped with high performance GPS, radar and Lidar. All the scenarios can be implemented by driving a lap on a KATRI ITS test track. These scenarios and safety evaluation factors are investigated via both a computer simulation and an experimental vehicle test on the test track. The experimental vehicle test was conducted with two automated vehicles, which are the evaluated vehicle and the hunter vehicle.
단부 보강한 합성보(에코거더)시스템의 구조성능에 관한 실험적 연구
채흥석,류재용,정경수,문영민,최성모,Chae, Heung-Suk,Ryoo, Jae-Yong,Chung, Kyung-Soo,Moon, Young-Min,Choi, Sung-Mo 한국강구조학회 2010 韓國鋼構造學會 論文集 Vol.22 No.6
H형강 보는 기둥 사이에 설치되어 건물의 각 층 바닥인 슬래브를 지지하기 위해 널리 사용되고 있다. 그러나, H형강 보의 경우 접합부가 고정단이면서 등분포하중 작용시 양 단부에 발생하는 휨 모멘트는 중앙부에 발생하는 모멘트에 비해 약 2배가량 크다. 보는 최대 모멘트에 의해 설계가 이루어지기 때문에 보 춤이 커지게 되고, 이로 인하여 각 층의 가용 공간이 줄어드는 문제점이 있다. 이를 개선하기 위해, 최대 휨 모멘트가 발생하는 H형강 보 양 단부만을 별도로 보강하면, 보 중앙부에서 발생하는 휨 모멘트로 보를 설계할 수 있다. 따라서, 단부 보강한 철골보(Eco-girder)의 구조적 성능을 분석하기 위해, 단부 보강 강판의 용도, 철근 보강, 하중전달방법 등을 변수로 하여 4개의 실험체를 제작하여 구조성능실험을 수행하였다. H-shaped beams, which are constructed between columns, are used widely as slaves in steel structures. The bending moments that occur on both ends of an H-shaped beam, however, are about twice the bending moment that occurs at the center of the H-shaped beam. Because such beam is designed with maximum bending moment, it is deeper and has smaller spaces. To improve these features, if both ends of an H-shaped beam that have maximum bending moments are merely reinforced, the beams could be designed by the bending moment at the center of the H-shaped beam. To analyze the structural performance of the proposed end-reinforced beams (eco-girders). Four specimens were prepared with the following parameters: end-reinforced steel plate, reinforced bars, and reinforced studs and experimental tests of the specimens were performed.
단부 보강한 합성보(Eco-girder)의 이력거동에 대한 수치해석적 연구
채흥석,류재용,정경수,문영민,최성모,Chae, Heung-Suk,Ryoo, Jae-Yong,Chung, Kyung-Soo,Moon, Young-Min,Choi, Sung-Mo 한국강구조학회 2010 韓國鋼構造學會 論文集 Vol.22 No.6
The end-reinforced composite-beam (eco-girder) system was developed that has characteristics of the existing composite beams such as reduced floor height and increased strength. With it, less use of steel is expected. In the eco-girder system, only both ends of the steel-frame beam, which are vulnerable to the ultimate moment, are reinforced with steel plates so that the steel frame beam design will be based on the moment at the beam center. This study used fiber element analysis, which is a simple representation and numerical integration of the principles of the detailed Finite Element Method(FEM), to predict the hysteretic behavior of reinforced composite beams under cyclic loading. The validity of the numerical method was verified by comparing the results of this study with those of previous studies. In addition, the hysteretic behavior of the eco-girder was compared with that of the existing composite beams. 층고 감소, 내력 증대 등의 장점을 가지고 있는 기존 합성보의 특징 뿐만 아니라 사용 강재량의 감소까지 기대할 수 있는 단부 보강한 합성보(Eco-girder) 시스템이 개발되었다. Eco-girder 시스템의 개념은 효율적인 합성보의 설계를 위해 최대 모멘트가 발생하는 양단부만을 강판을 이용하여 보강하고, 중앙부 모멘트에 의하여 철골보 크기를 결정하는 구조시스템이다. 본 연구에서는 반복 휨하중을 받는 단부보강 합성보의 이력거동을 예측하기 위해 정밀한 FEM(Finite Element Method)보다는 간단한 표현과 동시에 원리에 충실한 수치적분에 의한 면내수치해석방법(Fiber Element Analysis)을 이용하였으며, 선행 연구된 실험 결과와의 비교를 통해 수치해석방법의 타당성을 검증하였다. 또한 기존 합성보와의 이력거동을 비교 분석하였다.
UML 분석 모델의 구조적 제약사항에 대한 OCL 기반의 명세 및 검증
채흥석(Heung Seok Chae),염근혁(Keunhyuk Yeom) 한국정보과학회 2006 정보과학회논문지 : 소프트웨어 및 응용 Vol.33 No.2
분석 모델은 오직 시스템의 기능적 요구사항에 초점을 두며, 비 기능적인 요구사항과 구현과 관련된 이슈들은 이후의 설계 작업이 착수될 때까지 미루어진다. 설계 활동은 분석 모델을 상세화하고 명확하게 하는 방식으로 수행된다. 따라서, 분석 모델의 품질은 설계 모델에 지대한 영향을 미친다. 그러므로, 정확한 분석 모델을 구축하기 위하여 많은 노력을 기울여야 한다. 본 논문에서는 전형적인 객체지향 개발 방법론의 분석 모델이 항상 충족해야 하는 구조적 제약 사항을 제안한다. 제약 사항은 개별 클래스에 관한 제약사항, 클래스 간의 관계에 대한 제약 사항과 클래스의 사용에 대한 제약사항으로 분류된다. 각 제약사항 별로 정형적인 정의와 OCL을 이용한 기술이 제공된다. 또한, 2개의 산업체 프로젝트를 대상으로 수행된 사례 연구를 통하여 제안된 기법이 객체지향 분석 모델에 존재하는 심각한 오류를 발견하고 이를 수정하는 데 도움을 줄 수 있음을 보여 준다. Analysis model focuses only on functional requirements and postpones nonfunctional requirements and implementation specific issues until subsequent design activities are undertaken. Based on the analysis models, the design activities are performed by refining and clarifying the analysis models. Thus, the quality of analysis models has a vast impact on the design models. Therefore, much effort should be taken to build correct analysis model. In this paper, we propose a set of structural constraints that analysis models of typical object-oriented development methods should satisfy. Three kinds of constraints are proposed: class related constraints, relation related constraints, and usage related constraints. For each constraint, formal definition and description with OCL are provided. In addition, through a case study with two medium-sized industrial systems, we demonstrated that the proposed approach can help to identify and correct serious deficiencies in object-oriented analysis models.
채흥석(Heongseok Chae),정용환(Yonghwan Jeong),이명수(Myungsu Lee),민경찬(Kyongchan Min),이경수(Kyongsu Yi) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Regulation for the testing and operation of automated vehicles on public roadways has been recently developed all over the world. For example, the licensing standards for autonomous vehicles have been proposed in California and Nevada. However, safety performance evaluation scenarios for automated vehicles have not been proposed yet. It is important to comprehensively evaluate the safety performance of automated vehicles before they are produced and deployed. This paper presents lane change evaluation scenario of automated vehicles. Because lane change is frequently happened in driving situation, lane change evaluation is crucial. The scenario evaluates safety of automated vehicles changing lane, utilizing target vehicle placed on rear-side (next lane) of automated vehicles. The target vehicle is equipped with adaptive cruise control and auto emergency braking based on human driver data. Safety evaluation factors in lane change situation are also developed. This scenario is investigated via computer simulation.