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상수도 금속관의 외면과 내면 부식속도 평가에 관한 연구
배철호(Bae Chulho),김주환(Kim Juhwan),김정현(Kim Jeonghyun),홍성호(Hong Seongho) 한국지반환경공학회 2008 한국지반환경공학회논문집 Vol.9 No.1
본 연구에서는 상수도 금속관의 관 내·외면 부식상태를 평가하고, 내·외면 부식깊이(속도)와 매설년수의 관계를 통하여 내·외면 공식성장속도, 그리고 국내의 토양특성 인자들이 관 외면부식에 미치는 영향을 평가하여 관 외면의 노후상태를 예측할 수 있는 부식속도 모델을 제안하였다. 수집된 관체의 외면 부식깊이는 평균적으로 1.38 ㎜, 내면은 2.13 ㎜이었고, 이는 수질 등 내면부식영향 인자가 토양 등 외면부식영향 인자보다 부식에 미치는 영향이 크기 때문이며, 평균 공식성장 속도도 내면이 외면보다 두 배정도 빠른 것으로 나타났다. 외면부식에 영향을 주는 각 토양과 외면부식속도와의 상관성은 높지 않았으나, 모든 토양항목을 포함하여 회귀분석을 통하여 수립된 외면부식속도 예측모델은 기존 모델과 비교하여 더 높은 상관성을 보였다. In this study, external and internal pit growth rate model and external non-linear regression corrosion model were proposed by measuring pit depths and evaluating various soil factors known to contribute to the corrosion for metallic water pipes. Average pit depths of external and internal for metallic water pipes were measured 1.38 ㎜ and 2.13 ㎜, and internal pit growth rate also fasted twice than external pit growth rate. This means the corrosion potential of water quality was higher than soil. The corelation between external corrosion rate and each soil corrosion factor was low. However, proposed external non-linear regression corrosion model considering all soil corrosion factors showed a little higher correlation (R²=0.46) than conventional model.
컴포넌트 기반의 도시철도 유지보수를 위한 마스터 BOM 관리시스템 설계 및 개발
배철호(Chulho Bae),이호용(Hoyong Lee),김규희(Kyuhee Kim),서명원(Myungwon Suh) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
BOM(Bill of Materials) is a list or description of raw materials, parts and assemblies that define a product. In order to evaluate the performance of proposed BOM management system, it is very important to maintenance information system of urban transit. We developed component based BOM data and rule-set to design data structure that is mutually independent and integrated efficiently. It divides data with management interface using component technology. The component based master BOM has advantage in database size and flexibility. Flexibility is measured as the number of updating records in accordance with added new product or engineering change. In database size, component based BOM is the best. In this paper, we develop master BOM management system in web environment.
배철호(Bae Chulho),김정현(Kim Jeonghyun),우형민(Woo hyungmin),홍성호(Hong Seongho) 한국지반환경공학회 2008 한국지반환경공학회논문집 Vol.9 No.3
본 연구에서는 상수도 금속관의 공식특성에 따른 잔존 인장강도 예측모델을 제안하였다. 이들 모델중 회주철관에 대해서는 지수함수형 모델이 실측값에 대한 예측값의 상관성(R²)이 높게 나타났으며, 닥타일주철관과 강관 등은 선형함수인 공식특성에 따른 강도손실 모델이 더 예측력이 높은 것으로 나타났다. 국내에서 과거에 제조된 상수도 금속관의 파괴인성은 평균적으로 회주철관이 40.46kgf/㎟√㎜, 닥타일주철관이 85.27kgf/㎟√㎜, 그리고 강관이 97.27kgf/㎟√㎜로 나타났으며, 파괴인성을 이용한 잔존 인장강도 예측모델의 실측값에 대한 예측값의 상관성은 관종에 따라 다르나 0.44에서 0.86로 나타났다. 특히 이들 제안된 모델들을 새로운 지역에 매설된 상수관로에 대하여 적용한 결과, 결정계수가 0.76~0.78로 나타나 향후 노후 상수도 금속관의 잔존 강도를 예측하는데 활용됨으로서 합리적인 개대체 의사결정에도 도움을 줄 수 있을 것으로 판단된다. In this study, the residual strength prediction models were proposed by measuring various residual strength according to pit characteristics for metallic water pipes such as cast iron pipe (CIP), ductile iron pipe (DIP), and steel pipe (SP). The exponential prediction model was better fitted to measured residual tensile strength for CIP'. In case of DIP and SP, the prediction model using loss of strength was more exactly predicted compared with other model types. The fracture toughness were averagely 40.46kgf/㎟√㎜ for CIP, 85.27kgf/㎟√㎜ for DIP, and 97.27kgf/㎟√㎜ for SP, the determination coefficient (R²) of between measured residual tensile strength and predicted values for residual strength prediction models using fracture toughness was estimated from 0.44 to 0.86. Especially, the proposed residual tensile strength prediction models were applied for the verification and reliability to CIPs and DIPs at 14 sites. The determination coefficient (R²) between measured residual tensile strength and predicted values was estimated from 0.76 to 0.78. Therefore it was thought that the proposed residual tensile strength models could help to support resonable and economical decision of rehabilitation/replacement.
김현준(Hyunjun Kim),배철호(Chulho Bae),김성빈(Sungbin Kim),이호용(Hoyong Lee),김문현(Moonhyun Kim),서명원(Myungwon Suh) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.5
Urban transit is a complex system that is combined electrically and mechanically, it is necessary to construct maintenance system for securing safety accompanying high-speed driving and maintaining promptly. Expert system is a computer program which uses numerical or non-numerical domain-specific knowledge to solve problems. In this research, we intend to develop the expert system which diagnose failure causes quickly and display measures. For the development of expert system, standardization of failure code classification system and creation of BOM(Bill Of Materials) have been first performed. Through the analysis of failure history and maintenance manuals, knowledge base has been constructed. Also, for retrieving the procedure of failure diagnosis and repair linking with the knowledge base, we have built RBR(Rule Based Reasoning) engine by pattern matching technique and CBR(Case Based Reasoning) engine by similarity search method. This system has been developed based on web to maximize the accessibility.
차량 동역학을 이용한 멀티에이전트 기반 교통시뮬레이션 개발 Ⅱ: 운전자 및 차량 에이전트 개발
조기용(Kiyong Cho),배철호(Chulho Bae),권성진(Songjin Kwon),서명원(Myungwon Suh) 한국자동차공학회 2004 한국 자동차공학회논문집 Vol.12 No.5
In companion paper, the composition and structure of the traffic environment is derived. Rules to regulate agent behaviors and the frameworks to communicate between the agents are proposed. In this paper, the model of a driver agent which controls a vehicle agent is constructed. The driver agent is capable of having different driving styles. That is, each driver agent has individual behavior settings of the yielding index and the passing index. The yielding index can be defined as how often the agent yields in case of lane changes, and the passing index can be defined as how often the agent passes ahead. According to these indices, the agents overtake or make their lanes for other vehicles. Similarly, the vehicle agents can have various vehicle dynamic models. According to their dynamic characteristics, the vehicle agent shows its own behavior. The vehicle model of the vehicle agent contains the nonlinear subcomponents of engine, torque converter, automatic transmission, and wheels. The simulation has proceeded for an interrupted flow model. The result has shown that it is possible to express the characteristics of each vehicle and its driver in a traffic flow, and that the change of the traffic state is closely related with the distance and the signal delay between intersections. The system developed in this paper shows the effectiveness and the practical usefulness of the traffic simulation.<br/> <br/>
멀티 에이전트를 이용한 도로정체에 따른 교통흐름 예측 및 통합제어
조기용(Kiyong Cho),배철호(Chulho Bae),이정환(Junghwan Lee),주열(Yul Chu),서명원(Myungwon Suh) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.5
Freeway Corridors consist of urban freeways and parallel arterials that drivers can use alternatively. Ramp metering in freeways and signal control in arterials are contemporary traffic control methods that have been developed and applied in order to improve traffic conditions of freeway corridors. However, most of the existing studies have focused on either optimal ramp metering in freeways, or progression signal strategies between arterial intersections. There have been no traffic control systems in Korea that integrates the freeway ramp metering and arterial signal control. The effective control strategies for freeway operations may cause negative effects on arterial traffic. On the other hand, traffic congestion and bottleneck phenomenon of arterials due to the increasing peak-hour travel demand and ineffective signal operation may generate an accessibility problem to freeway ramps. Thus, the main function of the freeway which is the through-traffic process has not been successful. The purpose of this study is to develop an integrated control model that connects freeway ramp metering systems and signal control systems in arterial intersections. And Optimization of integrated control model which consists of ramp metering and signal control is another purpose. Optimization results are verified by comparison with the results from MATDYMO.
iRams를 이용한 도시철도 전동차의 신뢰성 분석에 관한 연구
김세훈(Sehoon Kim),배철호(Chulho Bae),김현준(Hyunjun Kim),구태윤(Taeyun Koo),박기준(Keejun Park),이호용(Hoyong Lee),서명원(Myungwon Suh) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Urban transit has grown to the principal public transportation during the past decades. In case that unexpected failures/accidents occur in urban transit, it can lead to confusion socially. Moreover, as urban transit is a complex system combined electrically and mechanically, it is necessary to perform more systematic maintenance to minimize occurrence of failures/accidents by reliability analysis. To analyze reliability of Urban Transit, this study applies iRams. After constructing bill of material and function/reliability block diagram of urban transit and its subsystem, on the basis of them, we estimate reliability of each subsystem. Finally, through result comparing estimated reliability with target reliability determined by ARINC, this study presents utility of reliability-based maintenance methodology.