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Computation of non-isothermal and compressible low Mach number gas flows by fully explicit scheme using control method for speed of sound 用声速控制方法计算非等温可压缩低马赫数气体流动的全显式格式
IF 0.5
Journal of Advanced Simulation in Science and Engineering Pub Date : 2019-03-15 DOI: 10.15748/JASSE.6.11
D. Toriu, S. Ushijima
{"title":"Computation of non-isothermal and compressible low Mach number gas flows by fully explicit scheme using control method for speed of sound","authors":"D. Toriu, S. Ushijima","doi":"10.15748/JASSE.6.11","DOIUrl":"https://doi.org/10.15748/JASSE.6.11","url":null,"abstract":"In this study, we propose a new fully explicit scheme for non-isothermal and compressible low Mach number gas flows based on a fractional step method and a control method for the speed of sound. Since the Courant-Friedrichs-Lewy (CFL) condition based on the speed of sound is improved according to an artificial coefficient for pressure fluctuation terms, the time increment in the proposed method can be set on the same order as that of a conventional semi-implicit method which treats pressure terms in momentum and energy equations implicitly. As a result of the application to the natural convection in a square cavity, it is demonstrated that the proposed fully explicit method enables to conduct computations reasonably about 6 ∼ 8 times faster than the conventional semi-implicit method by setting the appropriate value of the artificial coefficient for pressure fluctuation terms.","PeriodicalId":41942,"journal":{"name":"Journal of Advanced Simulation in Science and Engineering","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46506898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Foot Location Algorithm considering Geometric Constraints of Façade Cleaning 考虑表面清洗几何约束的足部定位算法
IF 0.5
Journal of Advanced Simulation in Science and Engineering Pub Date : 2019-01-01 DOI: 10.15748/JASSE.6.177
Shunsuke Nansai, H. Itoh
{"title":"Foot Location Algorithm considering Geometric Constraints of Façade Cleaning","authors":"Shunsuke Nansai, H. Itoh","doi":"10.15748/JASSE.6.177","DOIUrl":"https://doi.org/10.15748/JASSE.6.177","url":null,"abstract":"The purpose of this study is to propose a foot location algorithm for a glass façade cleaning robot. As an initial stage of this study, we set three assumptions regarding aimed module robot and window shape. These assumptions set the system some geometric constraint conditions: Right edge of the right cleaning unit moves along with the line of the right window frame. The cleaning area of right and left cleaning unit overlaps a little. The module robot walks with a step at a time. From the conditions, a foot location determination algorithm is constructed corresponding to four situations. The effectiveness of the algorithm is verified through a numerical simulation.","PeriodicalId":41942,"journal":{"name":"Journal of Advanced Simulation in Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67358824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A Study on Antenna with Characteristics of Insensitive to Metal for Installation in Proximity to Two Metal Walls 靠近两金属壁安装的金属不敏感天线研究
IF 0.5
Journal of Advanced Simulation in Science and Engineering Pub Date : 2019-01-01 DOI: 10.15748/JASSE.6.118
Yuta Nakagawa, N. Michishita, H. Morishita
{"title":"A Study on Antenna with Characteristics of Insensitive to Metal for Installation in Proximity to Two Metal Walls","authors":"Yuta Nakagawa, N. Michishita, H. Morishita","doi":"10.15748/JASSE.6.118","DOIUrl":"https://doi.org/10.15748/JASSE.6.118","url":null,"abstract":"In order to achieve a near-metal-insensitive antenna for closed space wireless communications, the impedance characteristics of folded monopole antennas (FMA) are of intense interest. The characteristics of a near-metal-insensitive antenna are basically not influenced by proximate objects, especially metal. This paper investigates the antenna characteristics when the antenna approaches metal plates in multiple directions to replicate an actual use environment. The results allow us to develop a higher impedance model that yields greater antenna performance than the conventional middle impedance model.","PeriodicalId":41942,"journal":{"name":"Journal of Advanced Simulation in Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15748/JASSE.6.118","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67358907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Computational strategy for studying structural change of tritium-substituted macromolecules by a beta decay to helium-3 氦-3衰变研究氚取代大分子结构变化的计算策略
IF 0.5
Journal of Advanced Simulation in Science and Engineering Pub Date : 2019-01-01 DOI: 10.15748/JASSE.6.94
Susumu Fujiwara, Hiroaki Nakamura, Haolun Li, Hisanori Miyanishi, T. Mizuguchi, T. Yasunaga, T. Otsuka, Y. Hatano, Shinji Saito
{"title":"Computational strategy for studying structural change of tritium-substituted macromolecules by a beta decay to helium-3","authors":"Susumu Fujiwara, Hiroaki Nakamura, Haolun Li, Hisanori Miyanishi, T. Mizuguchi, T. Yasunaga, T. Otsuka, Y. Hatano, Shinji Saito","doi":"10.15748/JASSE.6.94","DOIUrl":"https://doi.org/10.15748/JASSE.6.94","url":null,"abstract":". We propose a computational strategy for investigating structural change of tritium-substituted macromolecules. Effects of radiation on macromolecules such as polymeric materials and DNA are classified into three categories: (1) direct action, (2) indirect action, and (3) decay effect. In this study, we focus on the decay effect exclusively. After a beta decay of substituted tritium in macromolecules to helium-3, the generated inert helium-3 is assumed to be deleted quickly. To get an insight into the decay effect to the damage of macromolecules, we perform molecular dynamics simulations of tritium-deleted macromolecules and analyze their structural change. Preliminary simulation results of decay effect on polymeric materials and DNA are presented.","PeriodicalId":41942,"journal":{"name":"Journal of Advanced Simulation in Science and Engineering","volume":"87 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67360663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Development of CAVELib Compatible Library for HMD-type VR Devices hmd型VR设备CAVELib兼容库的开发
IF 0.5
Journal of Advanced Simulation in Science and Engineering Pub Date : 2019-01-01 DOI: 10.15748/JASSE.6.234
Shintaro Kawahara, A. Kageyama
{"title":"Development of CAVELib Compatible Library for HMD-type VR Devices","authors":"Shintaro Kawahara, A. Kageyama","doi":"10.15748/JASSE.6.234","DOIUrl":"https://doi.org/10.15748/JASSE.6.234","url":null,"abstract":"Head-mounted display-type VR devices (HMDs) are becoming a practical platform for three-dimensional scientific visualization. To reuse software assets that have been developed for CAVE-type VR systems (CAVEs), this paper presents a C++ library for porting CAVE application software to HMDs. Our library emulates the function calls of CAVELib, which is a commercial library for developing application software executable on CAVEs, and it enables us to easily port CAVELib application software to HMDs with minor modifications to the original source code. Sharing the source code also leads to an improvement in the software development efficiency, which is executable on both CAVEs and HMDs.","PeriodicalId":41942,"journal":{"name":"Journal of Advanced Simulation in Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67359453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Validity of Pressure-Velocity Correction Algorithm (C-HSMAC method) for Incompressible Fluids with Passive Scalar Convection 被动标量对流不可压缩流体压力-速度校正算法(C-HSMAC法)的有效性
IF 0.5
Journal of Advanced Simulation in Science and Engineering Pub Date : 2019-01-01 DOI: 10.15748/JASSE.6.260
S. Ushijima, H. Tanaka, D. Toriu
{"title":"Validity of Pressure-Velocity Correction Algorithm (C-HSMAC method) for Incompressible Fluids with Passive Scalar Convection","authors":"S. Ushijima, H. Tanaka, D. Toriu","doi":"10.15748/JASSE.6.260","DOIUrl":"https://doi.org/10.15748/JASSE.6.260","url":null,"abstract":". In the computations of incompressible fuids, it is essentially important to obtain accurately the velocity components that satisfy the incompressible condition ( ∇ · u = 0) as well as the pressure variables which are consistent with the velocity felds. For this purpose, a pressure-velocity correction method (C-HSMAC method) has been proposed by Ushijima et al. (2002) with a fnite volume method (FVM) for incompressible fuids. The purpose of this paper is to estimate the e ff ects of the unsatisfed incompressible condition on the passive scalar convection and to confrm that the C-HSMAC method is able to suppress them. The C-HSMAC and usual SMAC methods were applied to the passive scalar convection in the cavity having an oscillating top wall. It was concluded that the unsatisfed incompressible condition may cause the unphysical scalar overshoots in the SMAC method. In contrast, the C-HSMAC method enables us to control |∇ · u | with the given threshold ϵ D and to suppress such overshoots. In addition, it was demonstrated that the C-HSMAC method allows us to obtain reasonable results without overshoots even in combination with a higher-order scheme for convection terms with fner cell divisions.","PeriodicalId":41942,"journal":{"name":"Journal of Advanced Simulation in Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67359652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Cortical learning through the spike-timing-dependent plasticity modulated by intrinsic membrane potential fluctuation 通过固有膜电位波动调节的spike- time依赖性可塑性的皮质学习
IF 0.5
Journal of Advanced Simulation in Science and Engineering Pub Date : 2019-01-01 DOI: 10.15748/JASSE.6.32
Taishi Matsumura, T. Yuasa, Siu Kang
{"title":"Cortical learning through the spike-timing-dependent plasticity modulated by intrinsic membrane potential fluctuation","authors":"Taishi Matsumura, T. Yuasa, Siu Kang","doi":"10.15748/JASSE.6.32","DOIUrl":"https://doi.org/10.15748/JASSE.6.32","url":null,"abstract":"Cortical neurons exhibit membrane fluctuations and spontaneous transitions between distinct different two states characterized by subthreshold level of membrane potential. It has been known by modeling study that the mechanism of the spontaneous fluctuation originates from not only reverberation in a cortical circuit but intrinsic factor at a single neuron level. The two-state transitions are widely found in many brain regions and these transitions typically occurred spontaneously and synchronously. However, its computational advantage is still unclear. In this study, we investigated synaptic learning for external inputs in a model neuron whose dynamics of membrane potential fluctuation was modulated through the modification of ionic channel dynamics. It was observed that the membrane fluctuation could modulate the learning property to sequential inputs through the spike-timing-dependent plasticity.","PeriodicalId":41942,"journal":{"name":"Journal of Advanced Simulation in Science and Engineering","volume":"122 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67359782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A dissimilarity measure estimation for analyzing trajectory data 弹道数据分析中的不相似测度估计
IF 0.5
Journal of Advanced Simulation in Science and Engineering Pub Date : 2019-01-01 DOI: 10.15748/jasse.6.367
Reza Arfa, R. Yusof, P. Shabanzadeh
{"title":"A dissimilarity measure estimation for analyzing trajectory data","authors":"Reza Arfa, R. Yusof, P. Shabanzadeh","doi":"10.15748/jasse.6.367","DOIUrl":"https://doi.org/10.15748/jasse.6.367","url":null,"abstract":". Quantifying dissimilarity between two trajectories is a challenging problem yet it is a fundamental task with a wide range of applications. Existing dissimilarity measures are computationally expensive to calculate. We proposed a dissimilarity measure estimate for trajectory data based on deep learning methodology. One advantage of the proposed method is that it can get executed on GPU, which can significantly reduce the execution time for processing a large number of data. The proposed network is trained using synthetic data. A trajectory simulator that generates random trajectories is proposed. We used a publicly available dataset to evaluate the proposed method for the task of trajectory clustering. Our experiments show the performance of the proposed dissimilarity estimation method is comparable with well-known methods while our method is substantially faster to compute.","PeriodicalId":41942,"journal":{"name":"Journal of Advanced Simulation in Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15748/jasse.6.367","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67360084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Numerical Study for MrR Algorithm for Linear Equations with Symmetric Matrices 对称矩阵线性方程MrR算法的数值研究
IF 0.5
Journal of Advanced Simulation in Science and Engineering Pub Date : 2019-01-01 DOI: 10.15748/JASSE.6.128
Kuniyoshi Abe, S. Fujino, S. Ikuno
{"title":"A Numerical Study for MrR Algorithm for Linear Equations with Symmetric Matrices","authors":"Kuniyoshi Abe, S. Fujino, S. Ikuno","doi":"10.15748/JASSE.6.128","DOIUrl":"https://doi.org/10.15748/JASSE.6.128","url":null,"abstract":"We treat with Krylov subspace methods for efficiently solving linear equations. AZMJ variant of Orthomin(2) [1, 2] (abbreviated as AZMJ) has been proposed for solving the linear equations. In this paper, we redesign an alternative AZMJ variant, i.e., propose an alternative minimum residual method for symmetric matrices using the coupled twoterm recurrences formulated by Rutishauser. The recurrence coefficients are determined by imposing the A-orthogonality on the residuals as well as the Conjugate Residual (CR) method. The proposed variant is referred to as MrR. It is mathematically equivalent to CR and AZMJ, but the implementations are different; the recurrence formulas contain alternative expressions for the auxiliary vector and the recurrence coefficients. Moreover, we derive a preconditioned MrR algorithm. By numerical experiments on the linear equations with real symmetric matrices, we demonstrate that the residual norms of MrR converge faster than those of CG and AZMJ, and the preconditioned MrR algorithm is effective.","PeriodicalId":41942,"journal":{"name":"Journal of Advanced Simulation in Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15748/JASSE.6.128","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67358990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Memory Efficient Image Composition-based Parallel Particle Based Volume Rendering 基于内存高效的图像合成并行粒子体绘制
IF 0.5
Journal of Advanced Simulation in Science and Engineering Pub Date : 2019-01-01 DOI: 10.15748/JASSE.6.1
Yoshiaki Yamaoka, Kengo Hayashi, Naohisa Sakamoto, J. Nonaka
{"title":"A Memory Efficient Image Composition-based Parallel Particle Based Volume Rendering","authors":"Yoshiaki Yamaoka, Kengo Hayashi, Naohisa Sakamoto, J. Nonaka","doi":"10.15748/JASSE.6.1","DOIUrl":"https://doi.org/10.15748/JASSE.6.1","url":null,"abstract":"A Memory Efficient Image Composition-based Parallel Particle Based Volume Rendering Abstract. Large-scale simulations have widely been conducted on modern High-Performance Computing (HPC) systems in a variety of scientific and engineering fields, and scientific visualization has been a popular approach for analyzing and extracting meaningful information from the simulation results. In this work, we focused on Particle Based Volume Rendering (PBVR) method because of its proven effectiveness for handling non-trivial unstructured volume data, which is still commonly used on numerical simulations in the engineering fields. PBVR possesses a visibility sorting-free characteristics thanks to its use of small and opaque particles as the rendering primitives. However, there is a memory cost and image quality trade-off because of the necessity of storing the entire sets of generated particle data before starting the rendering process. In this paper, we present a memory cost efficient parallel PBVR approach for enabling high-quality and high-resolution PBVR of large-scale numerical simulation results. For this purpose, we focused on the image data gathering and processing instead of traditional particle data gathering and processing by using the sort-last parallel image composition approach. We evaluated its effectiveness on the K computer by using the Binary-Swap-based 234Compositor library, and verified its potential for reducing the memory cost while generating high-quality and high-resolution image data.","PeriodicalId":41942,"journal":{"name":"Journal of Advanced Simulation in Science and Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.15748/JASSE.6.1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67359221","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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