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The Application of Toolkit of optimization in Designs of Accelerator Magnets

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY 2010年第3期20卷 1827-1830页

作者： Wu, W. He, Y. Ma, L. Z. Xia, J. W. Yao, Q. G. Guo, B. L. Wu, X. Han, S. F. Zhang, S. L. Chinese Acad Grad Univ Beijing 100049 Peoples R China Chinese Acad Sci Inst Modern Phys Lanzhou 730000 Peoples R China

The traditional design of accelerator magnet usually involves many time consuming iterations of the manual analysis process. A software platform to do these iterations automatically is proposed in this paper. In this platform, we use DAKOTA (a open source software developed by Sandia National Laboratories) as the optimizing routine, which provides a variety of optimization methods and algorithms, and OPERA (software from Vector Fields) is selected as the electromagnetic simulating routine. In this paper, two examples of designs of accelerator magnets are used to illustrate how an optimization algorithm is chosen and the platform works.

关键词： Accelerator magnets computer aided software engineering magnetic fields optimization algorithm

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The Application of Toolkit of optimization in Designs of Accelerator Magnets

The Application of Toolkit of Optimization in Designs of Acc...

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21st International Conference on Magnet Technology (MT-21)

关键词： Accelerator magnets computer aided software engineering magnetic fields optimization algorithm

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optimization of Multi-View Texture Mapping for Reconstructed 3D Model

Optimization of Multi-View Texture Mapping for Reconstructed...

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8th World Congress on Intelligent Control and Automation (WCICA)

作者： Duan, Chunmei Tu, Changhe Meng, Xiangxu Shandong Normal Univ Sch Management & Econ Jinan Shandong Peoples R China Shandong Univ Sch Comp Sci & Technol Jinan Shandong Peoples R China

ISBN: (纸本)9781424467129

In this paper, we propose a new algorithm for optimizing surface texture mosaics when texturing 3D model reconstructed from multi-views of objects from real world. We start with the 3D geometry acquired by structure from motion (SFM) approach. Then, the photographic images for acquiring 3D structure are used as texture data and mapped precisely on the surface. Inspired by law of Matthew Effects, we implement an iteration algorithm for automatically sampling a few images as texture maps instead of using the whole set of input images. Imposed on visibility and texture area constraints, texture mosaics are efficiently regrouped in the iteration framework. A great deal of seams between different texture mosaics where texture maps belong to different views are relieved after performing our optimization method. The implemented texturing system and its sufficient experimental results demonstrate the practicability and efficiency of the proposed approach.

关键词： Probability model Texture mapping Matthew Effects optimization algorithm

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Computational optimization, modelling and simulation - a paradigm shift

Computational optimization, modelling and simulation - a par...

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International Conference on Computational Science (ICCS)

作者： Yang, Xin-She Koziel, Slawomir Univ Cambridge Dept Engn Trumpington St Cambridge CB2 1PZ England Reykjavik Univ Sch Sci & Engn Engn Optimizat & Modeling Ctr Reykjavik 101 Iceland

Computational optimization forms an integrated part of modern computational science. Any good design should intend to achieve certain optimality, though optimal solutions are often difficult to find in practice since uncertainty and nonlinearity always present in almost all real-world problems. As resources, time and money are always limited, optimization becomes even more important in practice. This workshop on Computational optimization, Modelling and Simulation (COMS 2010) at ICCS 2010 will summarize the latest developments of optimization and modelling and their applications in science, engineering and industry. (C) 2010 Published by Elsevier Ltd.

关键词： algorithm black-box modelling computational optimization derivative-free method optimization algorithm modelling nonlinear optimization surragate-based optimization simulation

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Assessing the intrinsic precision of 3D/3D rigid image registration results for patient setup in the absence of a ground truth

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MEDICAL PHYSICS 2010年第6期37卷 2501-2508页

作者： Wu, Jian Murphy, Martin J. Virginia Commonwealth Univ Dept Radiat Oncol Richmond VA 23298 USA

Purpose: To assess the precision and robustness of patient setup corrections computed from 3D/3D rigid registration methods using image intensity, when no ground truth validation is possible. Methods: Fifteen pairs of male pelvic CTs were rigidly registered using four different in-house registration methods. Registration results were compared for different resolutions and image content by varying the image down-sampling ratio and by thresholding out soft tissue to isolate bony landmarks. Intrinsic registration precision was investigated by comparing the different methods and by reversing the source and the target roles of the two images being registered. Results: The translational reversibility errors for successful registrations ranged from 0.0 to 1.69 mm. Rotations were less than 1 degrees. Mutual information failed in most registrations that used only bony landmarks. The magnitude of the reversibility error was strongly correlated with the success/failure of each algorithm to find the global minimum. Conclusions: Rigid image registrations have an intrinsic uncertainty and robustness that depends on the imaging modality, the registration algorithm, the image resolution, and the image content. In the absence of an absolute ground truth, the variation in the shifts calculated by several different methods provides a useful estimate of that uncertainty. The difference observed by reversing the source and target images can be used as an indication of robust convergence. (C) 2010 American Association of Physicists in Medicine. [DOI: 10.1118/1.3414041]

关键词： image registration image-guided treatment setup setup uncertainty registration error optimization algorithm

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Optimal Dam Operation during Flood Season Using a Distributed Hydrological Model and a Heuristic algorithm

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JOURNAL OF HYDROLOGIC ENGINEERING 2010年第7期15卷 580-586页

作者： Valeriano, Oliver Cristian Saavedra Koike, Toshio Yang, Kun Yang, Dawen Univ Tokyo Dept Civil Engn Bunkyo Ku Tokyo 1138656 Japan Chinese Acad Sci Inst Tibetan Plateau Res TEL Beijing 100085 Peoples R China Tsinghua Univ Dept Hydraul Engn Beijing 100084 Peoples R China

A physically based distributed hydrological model is coupled with an optimization algorithm for joint dam operation to reduce the flood peaks downstream. The decision variables are the release-inflow ratios. The heuristic algorithm seeds different release scenarios attempting to find the most suitable combination. The objective is to reduce the flood peak downstream, and the objective function is to minimize the difference between the simulated and threshold discharges. The latter depends on the purpose of flood management at the basin. Here, it is proposed as the mean discharge during heavy rainfall and is used to start a special dam operation. In order to fulfill the objective function, the reservoirs are expected to release water before the flood event takes place and close the gates during the flood peaks to replenish the released water beforehand. The developed system was applied to the upper Tone River in Japan where the optimal release schedule from two key dams was obtained. The observed weather radar products were input to the hydrological model to simulate the discharge within the river network. Then, the simulated inflows were input to the dam storage functions. The release is routed downstream and the river discharge is evaluated at the control point. The results indicate that the proposed integrated operation can effectively reduce a flood peak suggesting the feasibility of real-time operation in future developments.

关键词： Flood peak reduction Multi-reservoir operation optimization algorithm Optimal dam release Tone River Japan

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Optimum Horn Antenna Design Based On an Integration of HFSS Commercial Code and Genetic algorithms for the Feed Application of Reflector Antennas

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APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY JOURNAL 2010年第2期25卷 117-128页

作者： Chou, Hsi-Tseng Lu, Chia-Wei Chou, Hsi-Hsir Liao, Wen-Jiao Yuan Ze Univ Dept Commun Engn Chungli 320 Taiwan Ohio State Univ Electrosci Lab Columbus OH 43212 USA Univ Cambridge Dept Engn Cambridge CB2 1PZ England Natl Taiwan Univ Sci & Technol Dept Elect Engn Taipei Taiwan

The optimum design of horn antennas for the application as feeds to reflector antennas is performed utilizing a simulation tool based on an integration of HFSS commercial code as an electromagnetic computational engine and an add-on optimization scheme of genetic algorithm. This work is motivated by the need of antenna operations at multiband frequencies, where the horn antennas tend to radiate narrower beams at higher frequencies and result in inefficient uses of the reflector surface since the narrow beams will illuminate only a portion of the reflector surface. Optimum design of the horn antenna may significantly increase efficiency. The philosophy of this work is based on a fact that the currently available commercial codes are reliable and relatively accurate in the analysis with more efforts tending to enhance the computational efficiency. The quality of the antenna design will mainly rely on an effective optimization algorithm that can be and should be developed independently according to engineers' own need, since the variables and cost functions for optimization can be flexibly selected. The integration of existing analysis codes, as mentioned above, and self-developed algorithms will be most effective for an engineer in the customized antenna design. The concepts and strategies are addressed with numerical examples to validate.

关键词： Reflector Antenna Feed Horn Genetic algorithm optimization algorithm Code Integration

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Geometry Parameterization and Computational Mesh Deformation by Physics-Based Direct Manipulation Approaches

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AIAA JOURNAL 2010年第8期48卷 1817-1832页

作者： Yamazaki, Wataru Mouton, Sylvain Carrier, Gerald Off Natl Etud & Rech Aerosp Appl Aerodynam Dept F-92190 Meudon France Off Natl Etud & Rech Aerosp Appl Aerodynam Dept F-59045 Lille France

Consistent geometry parameterization of different models used in multidisciplinary optimization is one of the major issues for efficient design optimization. In this research, physics-based free-form deformation and radial-basis-function-based deformation approaches that allow a direct manipulation of an arbitrary object are proposed for efficient geometry manipulation and parameterization in the optimization processes. The developed methods can deform any computational mesh mapped on the deformable geometry at once. The methods have several advantages for geometry parameterization, such as easy handling of complex objects, direct manipulation, local controllability, and intuitive deformation as real elastic objects. In addition, they offer a straightforward solution for constructing a hierarchical/adaptive parameterization that can benefit the optimization algorithmic performances. Application to an aerodynamic design optimization showed that the methods were effective for efficient design optimization.

关键词： Aerodynamic Design Pilot Numerical Simulation Stiffness Matrices Wing Body Configuration Lagrange Multipliers Poisson's Ratio Computer Graphics Multi Objective Genetic algorithm optimization algorithm

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An Approach for Practical Use of Common-Mode Noise Reduction Technique for In-Vehicle Electronic Equipment

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IEICE TRANSACTIONS ON COMMUNICATIONS 2010年第7期E93B卷 1788-1796页

作者： Uno, Takanori Ichikawa, Kouji Mabuchi, Yuichi Nakamura, Atsushi Okazaki, Yuji Asai, Hideki DENSO CORP Kariya Aichi 4488661 Japan Hitachi Ltd Hitachi Ibaraki 3191292 Japan Renesas Technol Corp Kodaira Tokyo 1878588 Japan Shizuoka Univ Hamamatsu Shizuoka 4328561 Japan

In this paper, we studied the use of common-mode noise reduction technique for in-vehicle electronic equipment in an actual instrument design. We have improved the circuit model of the common-mode noise that flows to the wire harness to add the effect of a bypass capacitor located near the LSI. We analyzed the improved circuit model using a circuit simulator and verified the effectiveness of the noise reduction condition derived from the circuit model. It was also confirmed that offsetting the impedance mismatch in the PCB section requires to make a circuit constant larger than that necessary for doing the impedance mismatch in the LSI section. An evaluation circuit board comprising an automotive microcomputer was prototyped to experiment on the common-mode noise reduction effect of the board. The experimental results showed the noise reduction effect of the board. The experimental results also revealed that the degree of impedance mismatch in the LSI section can be estimated by using a PCB having a known impedance. We further inquired into the optimization of impedance parameters, which is difficult for actual products at present. To satisfy the noise reduction condition composed of numerous parameters, we proposed a design method using an optimization algorithm and an electromagnetic field simulator, and confirmed its effectiveness.

关键词： EMI common-mode current optimization algorithm ECU

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Long wave layer-specific representation of the optical properties of slab metamaterials

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INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS 2010年第4期32卷 207-218页

作者： Rybin, Oleg Raza, Muhammad Kharkov State Univ Food Technol & Trade Dept Informat Technol UA-61051 Kharkov Ukraine Bahauddin Zakariya Univ Ctr Adv Studies Pure & Appl Math Multan Pakistan

Analytical and numerical optimization method for evaluating the complex effective dielectric and magnetic constants of elementary flat slab of metamaterial is presented. The minimization problem is solved for a cascaded network representation of the slab utilizing the Effective Medium Theory. The algorithm is benchmarked using the free Meep FDTD software package.

关键词： Metamaterials microwave characterization effective medium theory optimization algorithm non-linear mathematical programming

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