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이산설계공간에서 직교배열표를 이용한 순차적 알고리듬의 국부해
이정욱(Jeong-Wook Yi),박경진(Gyung-Jin Park) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The structural optimization has been carried out in the continuous design space or in the discrete design space. Generally, available designs are discrete in design practice. But methods for discrete variables are extremely expensive in computational cost. In order to overcome this weakness, an iterative optimization algorithm was proposed for design in the discrete space, which is called as a sequential algorithm using orthogonal arrays (SOA). We focus to verify the fact that the local solution can be obtained throughout the optimization with this algorithm. The local solution is defined in discrete design space. Then the search space, which is the set of candidate values of each design variables formed by the neighborhood of current design point, is defined. It is verified that a local solution can be founded by moving sequentially the search space. The SOA algorithm has been applied to problems such as truss type structures. Then it is confirmed that a local solution can be obtained using the SOA algorithm.
복잡계관점에서 본 건설프로젝트 조직 내 협업네트워크 형성
손정욱(Son, Jeong-Wook),이준성(Yi, June-Seong),신승우(Shin, Seung-Woo),오진희(Oh, Jin-Hee) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.4
Even though organizational knowledge processes and organizational development processes have significant influence on project performance, current construction management practice does not explicitly consider organizational issues. Optimism bias regarding organizational aspects could lead to negative outcomes in large-scale construction projects where close coordination and communication among project participants is required to achieve project goals. On this premise, this paper introduces complex system perspective with which we can investigate project organizations from a realistic standpoint. Also, agent-based modeling and simulation method is suggested as a method to consider organizational issues in project management, and an example of agent-based simulation of project organizations is presented.
공리적 설계를 이용한 모니터용 EPS 완충 포장 설계 시스템 개발
이정욱(Jeong-Wook Yi),하대율(Dae-Yul Ha),이상우(Sang-Woo Lee),임재문(Jae-Moon Lim),박경진(Gyung-Jin Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The monitor product is packed by cushioning materials because the monitor can be broken during<br/> transportation. However, the addition of the cushioning material increased the volume of the product.<br/> Therefore, it is required that the usage of cushioning material be minimized. In practice, design engineers<br/> have followed the ad hoc design with experiences of predecessors. Automation of the design process is very<br/> important for the reduction of engineering cost, and can be achieved by an excellent design process and<br/> software development. A design flow is defined and a software system is developed for automated design.<br/> At first, a basic model is defined. A user can modify the model from menus and design is carried out<br/> according to the input from the user. Finite element models are automatically generated based on the design.<br/> A nonlinear finite element analysis program called LS/DYNA3D is linked for the impact analysis. The<br/> process of Design of Experiments using orthogonal array is installed to minimize the maximum acceleration<br/> in drop test. Therefore, a new design can be proposed by the system. The program is designed according<br/> to the Independence Axiom of Axiomatic design. FRs and DPs of the software system are defined and<br/> decomposed by zigzagging process. Independent modules can be generated by analysis of the full design<br/> matrix and each module is coded as class in Object Oriented Programming (OOP). Design results are<br/> discussed.
이산공간에서 순차적 알고리듬(SOA)을 이용한 전역최적화
조범상,이정욱,박경진,Cho Bum-Sang,Yi Jeong-Wook,Park Gyung-Jin 대한기계학회 2005 大韓機械學會論文集A Vol.29 No.10
In structural design, the design variables are frequently selected from certain discrete values. Various optimization algorithms have been developed fDr discrete design. It is well known that many function evaluations are needed in such optimization. Recently, sequential algorithm with orthogonal arrays (SOA), which is a search algorithm for a local minimum in a discrete space, has been developed. It considerably reduces the number of function evaluations. However, it only finds a local minimum and the final solution depends on the initial values of the design variables. A new algorithm is proposed to adopt a genetic algorithm (GA) in SOA. The GA can find a solution in a global sense. The solution from the GA is used as the initial design of SOA. A sequential usage of the GA and SOA is carried out in an iterative manner until the convergence criteria are satisfied. The performance of the algorithm is evaluated by various examples.
이산공간에서 순차적 알고리듬(SOA)을 이용한 전역최적화
조범상(Bum-Sang Cho),이정욱(Jeong-Wook Yi),박경진(Gyung-Jin Park) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
In the optimized design of an actual structure, the design variable should be selected among any certain values or corresponds to a discrete design variable that needs to handle the size of a pre-formatted part. Various algorithms have been developed for discrete design. As recently reported, the sequential algorithm with orthogonal arrays(SOA), which is a local minimum search algorithm in discrete space, has excellent local minimum search ability. It reduces the number of function evaluation using orthogonal arrays. However it only finds a local minimum and the final solution depends on the initial value. In this research, the genetic algorithm, which defines an initial population with the potential solution in a global space, is adopted in SOA. The new algorithm, sequential algorithm with orthogonal arrays and genetic algorithm(SOAGA), can find a global solution with the properties of genetic algorithm and the solution is found rapidly with the characteristics of SOA.
세부 공정별 CO<sub>2</sub> 배출 분석 및 환경비용 원가배분을 위한 Activity-based LCA 모델의 도입 - 커튼월 공사를 중심으로 -
임지연,이준성,신승우,손정욱,Lim, Ji-Youn,Yi, June-Seong,Shin, Seung-Woo,Son, Jeong-Wook 한국건설관리학회 2012 한국건설관리학회 논문집 Vol.13 No.4
지구 온난화의 주범인 온실가스 배출량을 규제하고자 하는 전 세계적인 기조에 따라 건설 분야에서도 이와 관련하여 다양한 노력이 시도되고 있다. 그 일례로 LCA (Life cycle Assessment) 방법론 도입을 통해 $CO_2$ 배출량을 정량적으로 측정하려는 연구가 활발하게 수행되고 있다. 그러나 일반 제조업에서 수행되고 있는 기존의 LCA 방법론은 다양한 자재의 투입과 복잡한 생산구조를 가지고 있는 건설업에 활용되기에는 많은 한계가 있다. 이에 본 연구는 보다 정확하고 세분화된 환경영향 평가를 도출할 수 있도록, 기존 LCA 방법론에 ABC원가관리방식을 도입한 Activity-based LCA 모델을 제안하였다. 이를 기반으로 대표적 온실가스인 $CO_2$의 주요 배출 Activity와 각각 배출량에 대한 정확한 예측이 가능하도록 하는 모델을 제시하였으며, 실제 시공 중인 건물의 커튼월 시스템 공정을 대상으로 하여 그 유용성을 검증하였다. As worldwide efforts to reduce global warming gases, the construction Industry is endeavoring to diminish carbon dioxides emissions. Especially, by introducing the LCA methodology to the industry, A variety of related studies to measure the emission of carbon dioxides have been conducted. However, when the conventional LCA methodology is applied to the construction projects, some limitations have been reported. To overcome the restrictions derived from the industry characteristics, this research suggested the Activity-based LCA model by applying the Activity-based Costing (ABC), which breaks down the whole life cycles into more detailed stages. By implementing the newly developed model, forecasting accuracy of $CO_2$ emission was elevated, and the critical control points on carbon dioxides were established. Through the case study of aluminium curtain-wall system, this research verified the usefulness of the Activity-based LCA.
시스템다이내믹스 기반 가구구조시장 감응형 주택수요-공급 분석모델 개발
오진희(Oh, Jin-Hee),이준성(Yi, June-Seong),신승우(Shin, Seung-Woo),손정욱(Son, Jeong-Wook) 대한건축학회 2013 大韓建築學會論文集 : 構造系 Vol.29 No.10
The current changes in household structure affect the residential environment and lifestyle of households. Especially the change of requirements to spec of housing has been considered to provide housing to meet the demands. As an important factor of national economy, the housing market needs to respond elastically to the change of demand caused by the new trend of household structure. However, owing to the complexity of housing market, the event-oriented approach methodologies have several difficulties and shortage to forecast housing market. Herein, System Dynamics(SD) methodology has been applied to provide understandable reasons in detail on how the housing market responses to the change in the household structure. Based on the casual loop diagram of housing market, the simulation model was constructed using Vensim DSS 6.0.1, and the case of single-person household in Gwangjin-Gu, Seoul was simulated. The result of this study provides the demand-supply model as foundation of an analysis and forecast the housing market according to the change in household structure. Due to the lead time of housing supply, however, the imbalance between supply and demand had caused an insecure housing market to be solved by government and stakeholders of market. The suggested model is expected to support decision making on the housing policy and business.
건축물 에너지 성능 향상을 위한 외단열 시스템 적용 공동주택 리모델링 사업의 경제성 평가
이소정(Lee, So-Jung),이준성(Yi, June-Seong),이지희(Lee, Jee Hee),손정욱(Son, Jeong Wook) 대한건축학회 2016 大韓建築學會論文集 : 構造系 Vol.32 No.5
Improvement of building"s energy performance is associated with the global trend of energy savings. Therefore, the construction industry has a tendency to change from new construction to remodeling and exterior insulation finishing system. It would be reasonable as a way to ensure thermal performance of buildings. The purpose of this research is applying EIFS in remodeling. The research examines the theory and practices for remodeling and EIFS. And it builds a 3D model of residential buildings to analyze economics by calculating the initial construction costs based on the historical performance cost and energy costs based on Autodesk Green Building Studio energy simulation. This study determines the cost recovery period by using simple payback period method, net present value method, internal rate of return method and LCC analysis. Result of the simple payback period is 2.92 years and the discounted payback period is 3 years. And it has economic benefit from the third year after remodeling according to the LCC analysis.