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Event detection and visualization of ocean eddies simulated by ocean general circulation model

International Journal of Modeling, Simulation, and Scientific Computing 2019年第3期10卷 164-182页

作者： Daisuke matsuoka Fumiaki Araki Hideharu Sasaki Information Engineering Program Research Institute for Value-Added-Information Generation Japan Agency for Marine-Earth Science and Technology(JAMSTEC)3173-25 Showa-machi Kanazawa-kuYokohama 236-0001Japan Application Laboratory(APL)Research Institute for Value-Added-Information Generation Japan Agency for Marine-Earth Science and Technology(JAMSTEC)3173-25 Showa-machi Kanazawa-kuYokohama 236-0001Japan

Numerical study of ocean eddies has been carried out by using high-resolution ocean general circulation *** order to understand ocean eddies from the large volume data produced by simulations,visualizing only eddy distribution at each time step is insufficient;time-variations in eddy events and phenomena must also be ***,existing methods cannot precisely find and track eddy events such as amalgamation and *** this study,we propose an original approach for eddy detection,tracking,and event visualization based on an eddy classification *** proposed method detects streams and currents as well as eddies,and it classifies discovered eddies into several categories using the additional stream and current *** tracking how the classified eddies vary over time,detecting events such as eddy amalgamation and bifurcation as well as the interaction between eddies and ocean currents becomes *** adopt the proposed method for two ocean areas in which strong ocean currents exist as case *** visualize the detected eddies and events in a time series of images,allowing us to acquire an intuitive understanding of a region of interest concealed in a high-resolution data ***,our proposed method succeeded in clarifying the occurrence place and seasonality of each type of eddy event.

关键词： Ocean simulation ocean eddy ocean current visualization

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An alternative visualization pipeline for large-scale data sets by using early visibility test point rendering

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International Journal of Modeling, Simulation, and Scientific Computing 2018年第3期9卷 55-65页

作者： Hideo Miyachi Daisuke matsuoka Yoji Matsumoto Department of Information Systems Tokyo City University 3-3-1 Ushikubonishi Tuzuki-kuYokohama City 224-8551Japan Center for Earth Information Science and Technology Japan Agency for Marine-Earth Science and Technology 3173-25 Showa-machi Kanazawa-ku Yokohama Japan Visualization Department Cybernet Systems Co.Ltd.Kanda Neribei-cho Chiyoda-ku TokyoJapan

The amount of produced data required to be visualized and analyzed has grown year by year,and the traditional approach of using larger computational resources or exploiting task and data parallelism seems to have reached its ***,a new paradigm for large-scale data visualization becomes highly desired,and in this paper,we propose a new and optimized visualization pipeline which uses a point rendering-based early visibility testing for reducing the unnecessary rendering in the final stage of the visualization pipeline,and we named this technique“Early Visibility Test Point Rendering”.In a densely populated polygonal mesh scene,where multiple triangles may cover a single pixel,unnecessary and wasteful rendering will occur in the final stage of the traditional visualization pipeline,that is,during the rasterization ***,we propose an alternative visualization pipeline by introducing the“Early Visibility Test Point Rendering”for selecting only the visible polygonal elements for a given visualization *** visibility testing can be executed on the CPU side,and only the visible polygonal elements are needed to be sent to the GPU for an optimized *** could verify the effectiveness of our proposed approach by using synthetic datasets,and also a real-world large-scale simulation result.

关键词： Large scale visualization point rendering visualization pipeline data reduction.

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NUMERICAL AND EXPERIMENTAL INVESTIGATION OF WAVE DYNAMIC PROCESSES IN HIGH-SPEED TRAIN/TUNNELS

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Acta Mechanica Sinica 2002年第3期18卷 209-226页

作者：姜宗林 K.matsuoka A.Sasoh K.Takayama LHD Institute of Mechanics Chinese Academy of Sciences Beijing China 100080 Shock Wave Research Center Institute of Fluid Science Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980-8577 Japan

Numerical and experimental investigation on wave dynamic processes induced by high-speed trains entering railway tunnels are presented. Experiments were conducted by using a 1:250 scaled train-tunnel simulator. Numerical simulations were carried out by solving the axisymmetric Euler equations with the dispersion-controlled scheme implemented with moving boundary conditions. Pressure histories at various positions inside the train-tunnel simulator at different distance measured from the entrance of the simulator are recorded both numerically and experimentally, and then compared with each other for two train speeds. After the validation of nonlinear wave phenomena, detailed numerical simulations were then conducted to account for the generation of compression waves near the entrance, the propagation of these waves along the train tunnel, and their gradual development into a weak shock wave. Four wave dynamic processes observed are interpreted by combining numerical results with experiments. They are: high-speed trains moving over a free terrain before entering railway tunnels; the abrupt-entering of high-speed trains into railway tunnels; the abrupt-entering of the tail of high-speed trains into railway tunnels; and the interaction of compression and expansion waves ahead of high-speed trains. The effects of train-tunnel configuration, such as the train length and the train-tunnel blockage ratio, on these wave processes have been investigated as well.

关键词： high-speed train tennel sonic boom numerical simulation experiments

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Effect of multifunction cavitation using phosphoric acid on fatigue and surface properties of AZ31 magnesium alloy

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镁合金学报(英文) 2023年第6期11卷 1996-2005页

作者： Shunta matsuoka Fumihiro Kato Toshihiko Yoshimura Masataka Ijiri Shoichi Kikuchi Graduate School of Integrated Science and Technology Shizuoka University3-5-1 JohokuNaka-kuHamamatsuShizuoka432-8561Japan Department of Mechanical Engineering Sanyo-Onoda City University1-1-1 Daigaku-DoriSanyo-OnodaYamaguchi 756-0884Japan Tokyo Metropolitan University 1-1 Minami-OsawaHachiojiTokyo 192-0397Japan Department of Mechanical Engineering Faculty of EngineeringShizuoka University3-5-1 JohokuNaka-kuHamamatsu-shiShizuoka 432-8561Japan

Magnesium alloy is attractive for lightweight construction but often suffers from poor corrosion resistance and low *** processing with chemicals,i.e.,multifunction cavitation(MFC),was introduced to form a high-corrosion film and improve the fatigue properties of an AZ31 magnesium *** analysis and plane bending fatigue tests were conducted for the MFC-treated magnesium alloy at a stress ratio,R,*** mechanical action of cavitation bubbles improved the fatigue life of magnesium alloys due to increasing the surface hardness and generating compressive residual ***,the combined mechanical and electrochemical action during MFC formed pits on the *** pits were large enough to easily nucleate an initial fatigue *** addition,the magnesium alloys without pit formation,for which a coating process using phosphoric acid was conducted after MFC using water,showed superior fatigue properties.

关键词： Magnesium alloy Multifunction cavitation Surface modification Fatigue Residual stress

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Is one-line hybrid rice coming?

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Journal of Integrative Plant Biology 2019年第8期61卷 908-910页

作者： Xingming Hu Fanmiao Wang Makoto matsuoka Bioscience and Biotechnology Center Nagoya UniversityNagoya 464-8601Japan State Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou 310006China

Asian cultivated rice is one of the most important cereal crops and feeds half of the world’s population,especially in eastern and southeastern Asian countries(Virmani 2012).It is estimated that about 20%or more increase in rice production would be likely needed in the next 20 years due to the growing population and environmental changes(Virmani 2012).

关键词： cereal crops rice southeastern

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Future Strategy of Breeding:Learn by Two Important Genes of Miracle Rice

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Molecular Plant 2020年第6期13卷 823-824页

作者： Kyosuke Kawai Miyako Ueguchi-Tanaka Makoto matsuoka Bioscience and Biotechnology Center Nagoya University464-8601 NagoyaJapan

In the"Analects of Confucius",there is a classic sentence that"too much is as bad as too little".The work by Wang et al.(2020)published in this issue reminds us that crop breeders should bear this sentence in mind whe... 详细信息

关键词： breed Learn she

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Slang feature extraction by analysing topic change on social media

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CAAI Transactions on Intelligence Technology 2019年第1期4卷 64-71页

作者： Kazuyuki Matsumoto Fuji Ren Masaya matsuoka Minoru Yoshida Kenji Kita Graduate School of Technology Industrial and Social SciencesTokushima University770-8506Tokushima-shiMinamijosanjima-cho 2-1Japan

Recently,the authors often see words such as youth slang,neologism and Internet slang on social networking sites(SNSs)that are not registered on *** the documents posted to SNSs include a lot of fresh information,they are thought to be useful for collecting *** is important to analyse these words(hereinafter referred to as‘slang’)and capture their features for the improvement of the accuracy of automatic information *** study aims to analyse what features can be observed in slang by focusing on the *** construct topic models from document groups including target slang on Twitter by latent Dirichlet *** the models,they chronologically the analyse change of topics during a certain period of time to find out the difference in the features between slang and general ***,they propose a slang classification method based on the change of features.

关键词： SNSs social media

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Regional management and biodiversity conservation in GIAHS:text analysis of municipal strategy and tourism management

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Ecosystem Health and Sustainability 2019年第1期5卷 124-132,I0019页

作者： Ryo Kohsaka Hikaru matsuoka Yuta Uchiyama Marie Rogel Graduate School of Environmental Studies Nagoya UniversityNagoyaJapan Institute of Science and Engineering Kanazawa UniversityKanazawaJapan Graduate School of Environmental Studies Tohoku UniversitySendaiJapan

Purpose of the research:To identify the gaps between the rhetoric and reality of the role of citizen participation and its role in maintenance and monitoring of heritages and resources(including biodiversity monitoring),we analyzed the discourse of Globally Important Agricultural Heritage System(GIAHS)at municipality ***:As an analytical framework,text mining is applied to interviews of officers at the municipal level of GIAHS in Noto which was amongst the first sites in *** identification of such gap is critical for sustainability and to prevent conflicts from tourism,agriculture or ***:The results reveal that(1)there is a gap between the official goals of that designation at the international level and local needs,(2)role of citizens is emphasized in the applications and action plans at rhetorical level but remain rather limited in practice and that(3)municipalities composing the GIAHS often have different priorities,even within the very same GIAHS sites,some municipalities even calling themselves“just a transition point to other destination municipalities.”Conclusions:It is critical for municipal officers to collaborate with various stakeholders,especially *** such,citizen science is a bottom-up approach to promote biodiversity conservation and facilitate GIAHS managements.

关键词： Municipality global institution GIAHS text mining co-occurrence analysis correspondence analysis

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Starch metabolism and grain chalkiness under high temperature stress

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National Science Review 2016年第3期3卷 280-282页

作者： Pei-Ching Lo Li Hu Hidemi Kitano Makoto matsuoka Graduate School of Bioagricultural Sciences Nagoya University Bioscience and Biotechnology Center Nagoya University

Rice is one of the most important staple crops,demand for which is increasing with population growth all over the world,especially in *** of recent global warming,significant reduction in yield and quality of rice has now become a serious *** of the most common damages incurred by high temperature(HT) stress is grain *** grains show loosely packed

关键词： QTLs GBSSI Starch metabolism and grain chalkiness under high temperature stress high

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Aerodynamic Study on Supersonic Flows in High-Velocity Oxy-Fuel Thermal Spray Process

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Journal of Thermal Science 2005年第2期14卷 126-129页

作者： Hiroshi KATANODA Takeshi matsuoka Seiji KURODA Jin KAWAKITA Hirotaka FUKANUMA Kazuyasu MATSUO The University of Kitakyushu 1-1 Hibikino Wakamatsu-kuKitakyushuFukuoka808-0135 JapanTakagi Precision Dies Co. Ltd.2-4-1 IshidaminamiKokuraminami-kuKitakyushuFukuoka802-0836 JapanNational Institute for Materials Science 1-2-1SengenTsukubaIbaraki305-0047 JapanNational Institute for Materials Science 1-2-1SengenTsukubaIbaraki305-0047 JapanPlasma Giken Co. Ltd.2-1-12BijogiTodaSaitama335-0031 JapanThe University of Kitakyushu 1-1 HibikinoWakamatsu-kuKitakyushuFukuoka808-0135 Japan

To clarify the characteristics of gas flow in high velocity oxy-fuel (HVOF) thermal spray gun, aerodynamic research is performed using a special gun. The gun has rectangular cross-sectional area and sidewalls of optical glass to visualize the internal flow. The gun consists of a supersonic nozzle with the design Mach number of 2.0 followed by a straight passage called barrel. Compressed dry air up to 0.78 MPa is used as a process gas instead of combustion gas which is used in a commercial HVOF gun. The high-speed gas flows with shock waves in the gun and jets are visualized by schlieren technique. Complicated internal and external flow-fields containing various types of shock wave as well as expansion wave are visualized.

关键词：超声流冲击波热喷涂内流热处理

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