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We herein tackled concurrent design of machines layout and automated guided vehicle (AGV) planning in a workshop, and proposed a co-evolutionary framework for the whole design with tandem AGVs system. Our objective is to reduce the material transporting costs in the manufacturing process and realize the flexible reconfigurable. Firstly, we divide the whole workshop into several regions (or groups),...
Nature-inspired algorithms are often used to find optimal solutions for many combinatorial problems. An immune inspired algorithm, opt-aiNet algorithm, is well known for function optimization. In this paper, we develop a combination of local search with opt-aiNet, called lopt-aiNet, to solve construction site layout (CSL) problem. The effectiveness of the proposed algorithm is investigated through...
This paper proposed a co-evolutionary methodology to optimize the layout of a practical tandem automated guided vehicles (AGV) workshop aiming to reduce the costs for material transporting in manufacturing process. This methodology provided a fresh line to address the machine assignment, internal and external loop layout, as well as the loops arrangement on the floor synthetically, the transfer station...
The design of a warehouse or distribution center (DC) has become an essential tool for the optimization of the supply chain in most industries. Energy consumption in this type of facilities is an important issue which has not received much attention in the scientific community which has focused instead in two-dimensional routing optimization. In this paper the problem of designing a rectangular warehouse...
The unplanned deployment of small cells is leading to high levels of intra- and inter-tier interference. An insight on how to manage the interference is vital to reach a significant capacity improvement through ultra-dense networks. This paper considers heterogeneous networks with carrier aggregation, where the macro cells operate at 800 MHz to provide coverage and the small cells operate at 2.6 GHz...
In data centers, huge amount of computes are running. These computes consume enormous energy. For this issue, several challenges were published. An energy efficient storage management cooperated with applications was one of effective approaches. With this method, data and storage devices are managed with application supports and power consumption of storage devices is significantly decreased. However,...
In this paper, under the condition of huai'an postal-delivery logistics facilities layout and the basic principle of SLP method, draw a SLP method research steps, and according to the principle and research further steps to huai'an postal-delivery logistics existing operation process and facility layout of survey and mapping, finally it is concluded that the reasonable solution.
Apache HBase is a column-oriented NoSQL key-value store built on top of the Hadoop distributed file-system. Logically, columns in HBase are grouped into column families. Physically, all columns in one column family are stored in the same set of files. Therefore the division of column families is closely related to the response time for a specific row query. In this paper, one new Evolutionary Algorithm...
Wind farm layout orientation plays an important factor to reduce the total wake loss and hence increase the capacity factor of the wind farm. Different wind farms layout design optimization techniques are widely used and classified into five different types including, Pattern Search Algorithm (PSAs), Gradient Search Algorithms (GSAs), Greedy Heuristic Algorithms (GHAs), Simulated Annealing Algorithms...
Based on the study of the workshop layout, aiming at minimizing "transportation distance", the mathematical model of the workshop layout is established, and the optimal design of workshop layout is achieved by using the genetic algorithm with penalty function. Through the calculation of a living example, the validity and feasibility of the algorithm is verified.
In order to simplify the optimization on workshop facility layout, a new approach is proposed in this paper by dividing the facilities in workshop to several rectangular production cells and introducing the concept of central point of material handling. Based on this idea, the objective function in aiming to minimize the cost of material handling is established and genetic algorithm method is applied...
Aiming at the problem that existing facilities layout methods give little attention to human factors, human factors and systematic layout planning are combined, a facilities layout optimization method which comprehensively takes human factors and logistics factors into account was proposed. Activity relationships among operation zones were constructed and facilities layout optimization schemes were...
This article establishes a multi-objective combinatorial optimization model of multi-product single-line layout to minimize multi-product logistics costs, processing time and area occupancy rate, based on the analysis of the shortcomings of single-product single-objective optimization. Considering factors impacting on logistics costs such as the product geometry, density, degree of vulnerability factors...
The optimization and selection procedure of logistics center facilities layout projects has an important status in the logistics system layout and planning. Aiming at the deficiencies existing in the logistics center facilities layout projects optimization and selection, a new optimization frame was developed. Based on the analysis to the recent relevant studies, the evaluation index system for logistics...
The optimization procedure of logistics center facilities layout projects has an important status in the logistics system layout and planning procedure. Based on the analysis to recent relevant studies, a new optimization frame for logistics center facilities layout projects was developed, and the evaluation index system was constructed, which included fourteen indexes. In view of the weight determination...
As a type of layout which can bring the material transport high flexibility, unidirectional loop layout is widely used in modern workshop layout. This paper deploys research around how to apply a unidirectional loop layout to optimize the facility layout in workshop. Firstly, it establishes a mathematic model of the optimization problem according to optimization objective and restriction condition...
The framework for evaluation and adjustment workshop layout has been designed in the paper. The evaluation system according to the characters in the manufacturing process of aero-engine production has been constructed. The fuzzy-AHP method is put forward to evaluate workshop layout. In order to adjust workshop layout according to the schema optimized, the generic algorithm has been designed. At the...
In this study, we implemented an auto-correction method for layout of 45 nm standard cells to get design-for-manufacturability (DFM) friendly design. The proposed method avoids lithography hotspot and particle defect, which are the source of systematic and random variation, by utilizing litho simulation and critical area analysis during optimization. In addition, to achieve maximum benefit of standard...
This paper studies the impact of intra-die random variability on low-power digital circuit designs, specifically, circuit timing failures due to intra-die variability. We identify a new low-Vdd statistical failure mode that is strongly supply-voltage dependent and also introduce a simple yet novel method for quantifying the effects of process variability on digital timing - a delay overlapping stage...
The challenges of deriving early-adopter competitive advantage, even with fabless access to process technology, through leveraging features offered by the advanced, and possibly disruptive, process technologies in real SoC products, are outlined. A structured methodology for addressing these challenges, and bridging the gap between process and design, sufficiently early in the development cycle to...
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