퍼지 알고리듬을 이용한 고차 이동슬라이딩서피스의 설계

박동원,최승복,Park, Dong-Won,Choi, Seung-Bok 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.1

A moving sliding surface(MSS) was proposed earlier for the second-order variable structure control system(VSCS). The MSS was disigned to pass arbitrary initial conditions, and subsequently moved towards a predetermined sliding surface by rotating and/or shifting. This methodology led to fast and robust control responses of the second-order VSCS, especially in a reaching phase. However, the moving algorithm of the MSS was too complicated to be employed to the high-order VSCS. To resolve this problem, a new moving algorithm based on the fuzzy theory is proposed in this paper. For the generalization of the MSS, the conditions for rotating or shifting are firstly investigated. Then the fuzzy algorithm is formulated by adopting the values of the surface function and the total discontinuity gain as input variables, and the variation of the surface function as output variable. The position control problem of an electrohydraulic servomechanism is adopted in order to demonstrate the efficiency and the feasibility of the proposed MSS associated with fuzzy algorithm.

실시간 분산처리 시스템 개발을 위한 설계 방안 연구

박동원,안성옥,Park, Dong-Won,Ahn, Sung-Og 배재대학교 공학연구소 1997 공학논문집 Vol.2 No.1

실시간 분산처리 시스템 개발을 위한 설계 동향을 분석한 바, 기존의 실시간 분산처리 시스템은 통신, 근사치 계산, 객체지향 패러다임, 멀티프로세서 하드웨어, 동적 시간 처리 및 에러 용인 등의 특성을 반영하여 설계되고 있다. 이러한 주요 설계 요소들의 장점, 단점을 분석하여 차세대 실시간 시스템 개발을 위한 방안을 논의하였다. In this paper, we examine design trends in the development of distributed real-time system. Many real-time systems developed over the last ten years share common characteristics including use of communications, imprecise computations, the object-oriented paradigm, multiprocessor node hardware, dynamic time-driven scheduling and the inclusion of fault tolerance mechanisms. By examining the major design decisions made in previous systems, the best attributes of these systems can be coalesced together to form the "ideal" real-time system. This paper examines such a system and the advantages and disadvantages of the design decisions involved.

실시간 활용을 위한 객체지향 자원관리

박동원,Park, Dong-Won 배재대학교 공학연구소 1998 공학논문집 Vol.3 No.1

This paper describes a model suitable for real-time languages, which explicitly defines a set of resource objects. The resource objects are constituted in a specialization hierarchy which allows programmers to perform resource handling at any desired level of detail, as well as providing a uniform interface. This object-oriented model is used to extend the applicability of the imprecise computation approach to deal with shortfalls of any computational resource, and enable to build real-time systems which can handle dynamic situations. 본 논문에서는 실시간 프로그래밍 언어와 적절히 연동할 수 있는 자원관리 모델을 제시한다. 시스템의 자원을 계층적으로 관리하여 일관된 인터페이스 환경을 유지하면서 미세조정까지 가능한 자원 이용환경을 제공하고자 하는 것이다. 이와 같은 객체지향 자원관리 기법은 계산 시간 부족을 처리하는 근사값 접근방법의 효과를 더욱 상승시킬 것이며, 또한 동적 실시간 시스템을 구축함도 용이롭게 할 수 있을 것이다.

지하수 오염방지를 위한 산업폐기물 관리평가 모델(IWEM)의 국내 적용성 분석

박동원,우남칠,정다위,Park, Dong-Won,Woo, Nam-C.,Chung, David 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.1

Selection of appropriate liner type would be the most important factor to prevent groundwater contamination by leachate from waste management site. This report introduces the IWEM (Industrial Waste Management Evaluation Model) developed by US EPA to evaluate the potential pollution of groundwater under the waste management unit and to suggest an appropriate type of liner, and provides with the results of IWEM application to a coal-ash landfill site in Korea as a case study. IWEM uses a standard method using a database, a decision-making process based on site characteristics, and the user-friendly input-and-output system. Authors evaluate this model to be applicable in Korea provided that the database is replaced into local data.

근사값 계산 방안에 대한 이론적 연구

박동원,Park, Dong-Won 배재대학교 자연과학연구소 1995 自然科學論文集 Vol.7 No.-

실 시간 처리 시스템에서의 시간제약 조건을 충족시키는 바람직한 수단으로 근사값 계산 방안이 제안되었지만, 이에 대한 근본적 이론연구는 깊이 고찰되어 있지 않은 형편이다. 이에 본 논문에서는 실제 응용그로그램에서의 근사값 계산 방안의 체택 당위성을 판단할 수 있는 이론적 결정 방법을 제시하였다. 이로써 실시간에서의 시스템 예측도와 대응능력을 높여, 효과적인 자원관리와 제약조건을 충족시킬 수 있도록 한다. Imprecise computation has been suggested as a promising model of real-time computing in order to deal with timing constraints imposed by the environment. However, the theoretical foundation of the technique has not been fully explored. To address this, a decision-theoretic foundation of imprecise computation is proposed. The main benefit of such a treatment is that it enables the qualitative assumptions underlying imprecise computation techniques to be explicitly stated in a formal way. The theoretical foundation laid out in this paper, hence, will not only enable the justification of using imprecise computation techniques for a real-time application, but will also facilitate the development of extended techniques for more complexs real-time systems.

금속면의 표면처리 방법에 따른 금합금과 전장레진간의 전단결합강도에 관한 연구

박동원,임오남,우이형,최부병,Park, Dong-Won,Lim, Ho-Nam,Woo, Yi-Hyung,Choi, Boo-Byung 대한치과보철학회 1995 대한치과보철학회지 Vol.33 No.4

The effect of five different surface treatments on the shear bond strength of the resin bond to Type IV Gold alloy was studied by bonding resin to metal. The metal surface was subjected to one of the following treatments and bonded ;(1) air abraded with $50{\mu}m$ alumina particles,(2) beads(3) beads and tin-plated at curreant density of 300mA/$cm^2$,(4) tin-plated at current density of 300mA/$cm^2$,(5) silicacoating with sililink, and bonded with an MDP Opaque primer, CESEAD resin system. The bonded specimens were immersed in water for 23 hours after 1 hour resin curing and shear bond strength were recorded. On the basis of this study, the following conclusions can be drawn; 1. Difference were found in the shear bond strength among all experimental groups. And bead glroup exihibited the highest shear bond strength and sand blasting group exhibited the lowest shear bond strength on five groups. 2. Bead group, mechanical bonding was significantly higher than that obtained with the samples, tinplating, silicacoating, and chemical bonding. 3. No statistically signiflcant difference was found between the shear bond strengths obtained with bead and bead-tinplating, and between tinplating and sili cacoating.

리튬이온 전지의 저온특성에 대한 Ethyl Acetate의 효과

박동원,정명우,김신국,최용국,Park, Dong-Won,Chung, Myoung-Woo,Kim, Shin-Kook,Choi, Yong-Kook 대한화학회 2008 대한화학회지 Vol.52 No.6

필러를 배합한 메타크릴레이트 중합체의 물성에 관한 비교 연구

박동원,최부병,권긍록,Park Dong-Won,Choi Boo-Byong,Kwon Kung-Rock 대한치과보철학회 2003 대한치과보철학회지 Vol.41 No.5

Purpose : The purpose of this study was to research the properties of some chemically cured methacrylate polymers such as MMA, HEMA, TEG-DMA, bis-GMA, GMA. Material and Method : 5 kinds of methacrylates were selected and added 2% tertiary amine and benzoyl peroxide to make a chemically curable polymer 25 micron crushed silicas which are treated with silane were selected as filler, they were added into methacrylate monomer until the consistency did not changed by the load of 500gram. All of the experimental resins were 5 kinds, and a serial test was done with 3 kinds of items including the filler contents, the tensile strength, and the bond strength. The number of specimen were 10 for each group. Filler contents were obtained by reducing the specimens to ashes at $600^{\circ}C$ for 1 hour. The specimens with the dimension of 6mm in diameter and 3mm thick were immersed in $37{\pm}1^{\circ}C$ distilled water for 24 hours before test, and tensile strength were measured with cross-head speed 1mm/min. Shear bond strength were mea sured on the specimens attached to bovine enamel etched with 37% phosphoric acid for 1 minute. Results : 1. Maximum filler incorporation was the highest as 75.5% on MMA, and the least as 53.4% on bis- GMA(p<0.0001). 2. The tensile stregth were MMA 141.3, GMA 154.3, TEG-DMA 157.4, bis-GMA 161.4 MPa, and HEMA showed the highest value, 226.9MPa(p = 0.0004). 3. The bond strength were GMA 10.1, TEG-DMA 11.7, HEMA 12.2, bis-GMA 13.3 MPa, and MMA showed the highest value, 15.3MPa, however statistical significances were not (p =0.3838), 4. TEG-DMA and HEMA were not different on the aspect of maximum filler contents and shear bond strength(p>0.05). Conclusion : HEMA can be used as an another diluent substituting TEG-DMA with the increased strength and with the constant bond strength and the constant filler contents.

지능형 실시간 제어 시스템 구축을 위한 연구

박동원,안성옥,Park, Dong-Won,An, Syung-Og 배재대학교 공학연구소 1998 공학논문집 Vol.3 No.1

본 논문에서는 지능형 실시간 제어 시스템 구축을 위하여 근사값 계산 방법의 적용을 rule-based 시스템과 관련하여 도모한다. 자원 정보에 대한 획득 및 표현 방안을 탐색하고, 이를 구현하기 위한 소프트웨어 설계 및 구현된 시스템의 타당성을 판단하기 위한 기준을 제시한다. This paper examines the application of imprecise computation technique in the context of rule-based systems and the development of a shell for building rule-based real-time control systems. Research issues to be addressed in order to build such a shell include acquisition and expression of resource information, development of a software architecture to support resource-based selectivity, and acceptability criteria for validating results obtained.

Ethyl Acetate가 첨가된 리튬염 유기전해질 특성 연구

박동원,정명우,이송주,최용국,Park, Dong-Won,Chung, Myoung-Woo,Lee, Song-Joo,Choi, Yong-Kook 대한화학회 2008 대한화학회지 Vol.52 No.6