• Title/Summary/Keyword: layout algorithm

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Applying a genetic algorithm to a block layout (블록단위 설비배치를 위한 유전자 알고리듬의 적용)

  • 우성식;박양병
    • Korean Management Science Review
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    • v.14 no.1
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    • pp.67-76
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    • 1997
  • The most research on facility layout problems ignored the actual shapes of activity spaces and the aisles between activities. In many cases, the research also ignored the actual shape of building where the activities are to be arranged. In this paper, We present a block based layout technique that applies a genetic algorithm to search for a very good facility layout with horizontal aisles. From the extensive experiments for two different cases with respect to the shape of activity space, it was found that the proposed method generated better layouts than the ones obtained by applying Tam's algorithm in all test problems. The proposed algorithm showed about 10% improvement of performance on the average. We determined the best combination of the reproduction rule and the genetic operators with their probabilities for each test problem through the experiment.

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The Genetic Algorithm for Switchbox Routing (스위치박스 배선 유전자 알고리즘)

  • 송호정;정찬근;송기용
    • Journal of the Institute of Convergence Signal Processing
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    • v.4 no.4
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    • pp.81-86
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    • 2003
  • Current growth of VLSI design depends critically on the research and development of automatic layout tool. Automatic layout is composed of placement assigning a specific shape to a block and arranging the block on the layout surface and routing finding the interconnection of all the nets. Algorithms performing placement and routing impact on performance and area of VLSI design. Switchbox routing is a problem interconnecting each terminals on all four sides of the region, unlike channel routing. In this paper we propose a genetic algorithm searching solution space for switchbox routing problem. We compare the performance of proposed genetic algorithm(GA) for switchbox routing with that of other switchbox routing algorithm by analyzing the results of each implementation. Consequently experimental results show that out proposed algorithm reduce routing length and number of the via over the other switchbox routing algorithms.

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Layout Automation of Integrated Circuits Based on Analog Constraints (아날로그 제약 조건을 고려한 집적회로의 레이아웃 자동화)

  • Cho, Hyun-Sang;Kim, Young-Soo;Oh, Jeong-Hwan;Yoon, Kwang-Sub;Han, Chang-Ho
    • The Transactions of the Korea Information Processing Society
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    • v.4 no.8
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    • pp.2120-2132
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    • 1997
  • A layout automation system for analog integrated circuits is proposed. The implemented system performs full-custom analog layout under the analog layout constraints. In order to overcome the demerits of conventional analog layout systems, parameterized module library is proposed. The system can support complex analog layout modules, resulting in a maximum expandability of the system. Moreover, modified dynamic multi-path algorithm is developed by enhancing the conventional Dijkstra algorithm. Several benchmark circuits such as comparator, op amp, and filter was tested by the system. Layout results compared to OPASYN show well-merging layout and interdigitized layout module.

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Layout Optimization Method of Railway Transportation Route Based on Deep Convolution Neural Network

  • Cong, Qiao;Qifeng, Gao;Huayan, Xing
    • Journal of Information Processing Systems
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    • v.19 no.1
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    • pp.46-54
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    • 2023
  • To improve the railway transportation capacity and maximize the benefits of railway transportation, a method for layout optimization of railway transportation route based on deep convolution neural network is proposed in this study. Considering the transportation cost of railway transportation and other factors, the layout model of railway transportation route is constructed. Based on improved ant colony algorithm, the layout model of railway transportation route was optimized, and multiple candidate railway transportation routes were output. Taking into account external information such as regional information, weather conditions and actual information of railway transportation routes, optimization of the candidate railway transportation routes obtained by the improved ant colony algorithm was performed based on deep convolution neural network, and the optimal railway transportation routes were output, and finally layout optimization of railway transportation routes was realized. The experimental results show that the proposed method can obtain the optimal railway transportation route, the shortest transportation length, and the least transportation time, maximizing the interests of railway transportation enterprises.

Interactive Control Panel Layout Using a Constraint Satisfaction Algorithm (제약만족 알고리즘을 이용한 상호대화적 조종패널 배치)

  • Park, Sung-Joon;Jeong, Eui-S.;Chang, Soo-Y.
    • Journal of Korean Institute of Industrial Engineers
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    • v.20 no.4
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    • pp.85-97
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    • 1994
  • An interactive and iterative control panel layout method based on the constraint satisfaction problem (CSP) technique was developed to generate an ergonomically sound panel design. This control panel layout method attempts to incorporate a variety of relevant ergonomic principles and design constraints, and generate an optimal or, at least, a "satisfactory" solution through an efficient search algorithm. The problem of seeking an ergonomically sound panel design should be viewed as a multi-criteria design problem and most of the design objectives should be understood as constraints. Hence, a CSP technique was employed in this study for dealing with the multi-constraints layout problem. The efficient search algorithm using "preprocess" and "look_ahead" procedures was developed to handle vast amount of computation. In order to apply the CSP technique to the panel layout procedure, the ergonomic principles such as spatial compatibility, frequency-of-use, importance, functional grouping, and sequence-of-use were formalized as CSP terms. The effectiveness of the proposed panel layout method was evaluated by example problems and the results clearly showed that the generated layouts properly considered various ergonomic design principles.

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An integrated model of cell formation and cell layout for minimizing exceptional elements and intercell moving distance (예외적 요소와 셀간 이동거리를 최소화할 수 있는 셀 형성과 셀 배치결정 모형)

  • 윤창원;정병희
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 1996.04a
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    • pp.121-124
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    • 1996
  • In general, cellular manufacturing system can be constructed by the following two steps. The first step forms machine cells and part families, and the second step determines cell layout based on the result of first step. Cell layout has to be considered when cell is formed becauese the result of cell formation affects it. This paper presents a cell formation algorithm and proposes an integrated mathematical model for cell formation and cell layout. The cell formation algorithm minimizes the number of exceptional element in cellular manufacturing system. New concept for similarity and incapability is introduced, based on machine-operation incidence matrix and part-operation incidence matrix. One is similarity between the machines, the other is similarity between preliminary machine cells and machines. The incapability identifies relations between machine cells and parts. In this procedure, only parts without an exceptional element are assigned to machine cell. Bottleneck parts are considered with cell layout design in an integrated mathematical model. The integrated mathematical model determines cell layout and assigns bottleneck parts to minimize the number of exceptional element and intercell moving distance, based on linearixed 0-1 integer programming. The proposed algorithm is illustrated by using numerical examples.

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Optimization of settlement layout based on parametric generation

  • Song, Jinghua;Xie, Xinqin;Yu, Yang
    • Advances in Computational Design
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    • v.3 no.1
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    • pp.35-47
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    • 2018
  • Design of settlement space is a complicated process while reasonable spatial layout bears great significance on the development and resource allocation of a settlement. The study proposes a weighted L-system generation algorithm based on CA (Cellular Automation) model which tags the spatial attributes of cells through changes in their state during the evolution of CA and thus identifies the spatial growth mode of a settlement. The entrance area of the Caidian Botanical and Animal Garden is used a case study for the model. A design method is proposed which starts from the internal logics of spatial generation, explores possibility of spatial rules and realizes the quantitative analysis and dynamic control of the design process. Taking a top-down approach, the design method takes into account the site information, studies the spatial generation mechanism of settlements and further presents a engine for the generation of multiple layout proposals based on different rules. A optimal solution is acquired using GA (Genetic Algorithm) which generates a settlement spatial layout carrying site information and dynamically linked to the surround environment. The study aims to propose a design method to optimize the spatial layout of the complex settlement system based on parametric generation.

Multi-floor Layout Model for Topsides of Floating Offshore Plant using the Optimization Technique (최적화 기법을 이용한 부유식 해양 플랜트 상부 구조의 다층 배치 모델)

  • Jeong, Se-Yong;Roh, Myung-Il;Shin, Hyunkyoung
    • Journal of the Society of Naval Architects of Korea
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    • v.52 no.1
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    • pp.77-87
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    • 2015
  • For a floating offshore plant such as FPSO(Floating, Production, Storage, and Off-loading unit), various equipment should be installed in the restricted space, as compared with an onshore plant. The requirement for an optimal layout method of the plant has been increased in these days. Thus, a layout method of the floating offshore plant was proposed in this study. For this, an optimization problem for layout design was mathematically formulated, and then an optimization algorithm based on the genetic algorithm was implemented with C++ language in order to solve it. Finally, the proposed method was applied to an example of FPSO topsides. As a result, it was shown that the proposed method can be applied to layout design of the floating offshore plant such as FPSO.

Layout Method of a Floating Offshore Structure Using the Optimization Technique (최적화 기법을 이용한 부유식 해양 구조물의 배치 방법)

  • Jeong, Se-Yong;Roh, Myung-Il;Shin, Hyun-Kyoung;Ha, Sol;Ku, Nam-Kug
    • Korean Journal of Computational Design and Engineering
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    • v.18 no.6
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    • pp.439-450
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    • 2013
  • In the case of a floating offshore structure such as FPSO(Floating, Production, Storage, and Offloading unit), many equipment should be installed in the limited space, as compared with an onshore structure. Recently, the requirement for an optimal layout method of the structure has been raised. Thus, a layout method of the floating offshore structure was proposed in this study. First, an optimization problem for layout design was mathematically formulated, and then an optimization algorithm was implemented based on the genetic algorithm in order to solve it. To evaluate the applicability of the proposed method, it was applied to examples ofFPSO topsides and an offshore wind turbine. As a result, it was shown that the proposed method can be applied to layout design of the floating offshore structure.

Facility Layout Problem with Genetic Algorithm (Genetic Algorithm을 이용한 건설물자재의 Layout)

  • Jang Hyoun-Seung
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • autumn
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    • pp.99-103
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    • 2003
  • The most commonly used method for space management in the industry is development of site plans. These plans outline how to manage material deliveries, staging areas, and crane locations for construction sites in suburban area but not in congested urban areas. This study focuses on how to efficiently manage space for construction facilities on high-rise buildings in congested urban areas where normally space for facilities around a building footprint is not available. The limitations of available horizontal space create a need to explore vertical expansion of facilities. This raises new aspects of vertical facility handling and flow that need to be considered in the facility design problem. The construction facilities layout plan method provides layout planners with a valuable technique to develop efficient sequences of work that optimally defines how to efficiently utilize the construction facilities and minimize the travel of specific facilities effort on multiple-floor buildings. A genetic algorithm-based heuristic will be presented for generating block layouts for multiple-floor la)rout problems.

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