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Comment on: Long-term hemodialysis improved and stabilized diabetic macular edema: two case reports

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International Journal of Ophthalmology(English edition) 2022年第11期15卷 1891-1892页

作者： yusuke kameda Yuta Suzuki Megumi Sugai Karin Ishinabe Nichika Fukuoka Yotsuya-sanchome Ekimae Eye Clinic Tokyo 160-0004Japan

Dear Editor,With great excitement, we read the article titled “Longterm hemodialysis improved and stabilized diabetic macular edema: two case reports” by Fan and Yuan[1];a case series study which provided interestin... 详细信息

关键词： edema hemodialysis diabetic

Ehrhart Polynomials of 3-Dimensional Simple Integral Convex Polytopes

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Chinese Annals of Mathematics,Series B 2017年第6期38卷 1345-1352页

作者： yusuke SUYAMA Department of Mathematics Graduate School of ScienceOsaka City University3=3-138 SugimotoSumiyoshi=kuOsaka 558-8585Japan.

The author gives an explicit formula on the Ehrhart polynomial of a 3-dimensional simple integral convex polytope by using toric geometry.

关键词： Integral convex polytopes Ehrhart polynomials Toric geometry

Thermal Analysis of Resin Composites with Ellipsoidal Filler Considering Thermal Boundary Resistance

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Journal of Thermal Science 2016年第5期25卷 424-430页

作者： yusuke Asakuma Tsuyoshi Yamamoto Department of Chemical Engineering University of Hyogo Department of Chemical Engineering Kyushu University

The effective thermal conductivity of composites with ellipsoidal fillers is analyzed by using a homogenization method that is able to represent the microstructure *** this study,various parameters such as the volume fraction,shape,and distribution of the filler are quantitatively estimated to understand the mechanisms of heat transfer in the ***,thermal boundary resistance between resin and filler is important for obtaining composites with higher thermal ***,the anisotropy of the effective thermal conductivity arises from contact between filler in the case of ellipsoidal filler and produces lower thermal ***,the filler network and thermal resistance are essential for the heat transfer in composites because the path of thermal conduction is improved by contact between neighboring filler particles.

关键词： effective thermal conductivity homogenization method multiscale analysis composite.

Parallel computing of discrete element method on multi-core processors

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Particuology 2011年第4期9卷 398-405页

作者： yusuke Shigeto Mikio Sakai Department of Systems Innovation School of Engineering The University of Tokyo

This paper describes parallel simulation techniques for the discrete element method （DEM） on multi-core processors. Recently, multi-core CPU and GPU processors have attracted much attention in accelerating computer simulations in various fields. We propose a new algorithm for multi-thread parallel computation of DEM, which makes effective use of the available memory and accelerates the computation. This study shows that memory usage is drastically reduced by using this algorithm. To show the practical use of DEM in industry, a large-scale powder system is simulated with a complicated drive unit. We compared the performance of the simulation between the latest GPU and CPU processors with optimized programs for each processor. The results show that the difference in performance is not substantial when using either GPUs or CPUs with a multi-thread parallel algorithm. In addition, DEM algorithm is shown to have high scalabilitv in a multi-thread parallel computation on a CPU.

关键词： Discrete element method Parallel computing Multi-core processor GPGPU

Petrology,geochemistry,and zircon U-Pb geochronology of the Zambezi Belt in Zimbabwe:Implications for terrane assembly in southern Africa

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Geoscience Frontiers 2019年第6期10卷 2021-2044页

作者： yusuke Kuribara Toshiaki Tsunogae yusuke Takamura Yukiyasu Tsutsumi Graduate School of Life and Environmental Sciences University of TsukubaIbaraki 305-8572Japan Department of Geology University of JohannesburgAuckland Park 2006South Africa Department of Geology and Paleontology National Museum of Nature and ScienceIbaraki 305-0005Japan

The Zambezi Belt in southern Africa has been regarded as a part of the 570-530 Ma Kuunga Orogen formed by a series of collision of Archean cratons and Proterozoic orogenic ***,we report new petrological,geochemical,and zircon U-Pb geochronological data of various metamorphic rocks(felsic to mafic orthogneiss,pelitic schist,and felsic paragneiss)from the Zambezi Belt in northeastern Zimbabwe,and evaluate the timing and P-T conditions of the collisional event as well as protolith *** data of felsic orthogneiss indicate within-plate granite signature,whereas those of mafic orthogneiss suggest MORB,ocean-island,or within-plate *** P-Testimates for orthogneisses indicate significant P-T variation within the study area(700-780 C/6.7-7.2 kbar to 800-875 C/10-11 kbar)suggesting that the Zambezi Belt might correspond to a suture zone with several discrete crustal *** cores from felsic orthogneisses yielded two magmatic ages:2655±21 Ma and 813士5 Ma,which suggests Neoarchean and Early Neoproterozoic crustal growth related to within-plate *** zircons from metasediments display various ages from Neoarchean to Neoproterozoic(ca.2700-750 Ma).The Neoarchean(ca.2700-2630 Ma)and Paleoproterozoic(ca.2200-1700 Ma)zircons could have been derived from the adjacent Kalahari Craton and the Magondi Belt in Zimbabwe,*** Choma-Kalomo Block and the Lufilian Belt in Zambia might be proximal sources of the Meso-to Neoproterozoic(ca.1500-950 Ma)and early Neoproterozoic(ca.900-750 Ma)detrital zircons,*** detrital zircons from adjacent terranes possibly deposited during late Neoproterozoic(744-670 Ma),and subsequently underwent highgrade metamorphism at 557-555 Ma possibly related to the collision of the Congo and Kalahari Cratons during the latest Neoproterozoic to *** contrast,670-627 Ma metamorphic ages obtained from metasediments are slightly older than previous reports,but consistent with^68

关键词： Geothermobarometry Detrital zircon Neoproterozoic Congo Craton Kalahari Craton Gondwana

Joint input–output identiﬁcation of unstable systems with kernel regularization

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Control Theory and Technology 2024年第2期22卷 195-202页

作者： yusuke Fujimoto Toshiharu Sugie Department of Environmental Engineering the University of Kitakyushu1-1HibikinoWakamatsu-kuKitakyushu 8080135FukuokaJapan Professor Emeritus Kyoto UniversityYoshida-HonmachiSakyo-kuKyoto 6068501KyotoJapan

This paper discusses closed-loop identiﬁcation of unstable *** particular,weﬁrst apply the joint input–output identiﬁcation method and then convert the identiﬁcation problem of unstable systems into that of stable systems,which can be tackled by using kernel-based regularization *** propose to identify two transfer functions by kernel regularization,the one from the reference signal to the input,and the one from the reference signal to the *** these transfer functions are stable,kernel regularization methods can construct their accurate *** the model of unstable system is constructed by ratio of these *** effectiveness of the proposed method is demonstrated by a numerical example and a practical experiment with a DC motor.

关键词： Closed-loop identification Kernel regularization Joint input-output identification

Tool path generation and optimization for freeform surface diamond turning based on an independently controlled fast tool servo

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International Journal of Extreme Manufacturing 2022年第2期4卷 145-160页

作者： yusuke Sato Jiwang Yan Department of Mechanical Engineering Keio UniversityYokohama 223-8522Japan

Diamond turning based on a fast tool servo(FTS)is widely used in freeform optics fabrication due to its high accuracy and machining *** a new trend,recently developed high-frequency and long-stroke FTS units are independently driven by a separate control system from the machine tool ***,the tool path generation strategy for the independently controlled FTS is far from *** study aims to establish methods for optimizing tool path for the independent control FTS to reduce form errors in a single step of *** from the conventional integrated FTS control system,where control points are distributed in a spiral pattern,in this study,the tool path for the independent FTS controller is generated by the ring method and the mesh method,*** machined surface profile is predicted by simulation and the parameters for the control point generation are optimized by minimizing the deviation between the predicted and the designed *** demonstrate the feasibility of the proposed tool path generation strategies,cutting tests of a two-dimensional sinewave and a micro-lens array were conducted and the results were *** a result,after tool path optimization,the peak-to-valley form error of the machined surface was reduced from 429 nm to 56 nm for the two-dimensional sinewave by using the ring method,and from 191 nm to 103 nm for the micro-lens array by using the mesh method,respectively.

关键词： ultraprecision machining diamond turning fast tool servo freeform surface tool path optimization

Modified filtered importance sampling for virtual spherical Gaussian lights

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Computational Visual Media 2016年第4期2卷 343-355页

作者： yusuke Tokuyoshi Square Enix Co. Ltd.

This paper proposes a modification of the filtered importance sampling method, and improves the quality of virtual spherical Gaussian light(VSGL)-based real-time glossy indirect illumination using this modification. The original filtered importance sampling method produces large overlaps of and gaps between filtering kernels for high-frequency probability density functions(PDFs). This is because the size of the filtering kernel is determined using the PDF at the sampled center of the kernel. To reduce those overlaps and gaps, this paper determines the kernel size using the integral of the PDF within the filtering kernel. Our key insight is that these integrals are approximately constant, if kernel centers are sampled using stratified sampling. Therefore, an appropriate kernel size can be obtained by solving this integral equation. Using the proposed kernel size for filtered importance samplingbased VSGL generation, undesirable artifacts are significantly reduced with a negligibly small overhead.

关键词： filtered importance sampling real-time rendering global illumination virtual point lights

Morphology control of aluminum nitride(AlN)for a novel high-temperature hydrogen sensor

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International Journal of Minerals,Metallurgy and Materials 2020年第11期27卷 1560-1567页

作者： Angga Hermawan yusuke Asakura Shu Yin Institute of Multidisciplinary Research for Advanced Material(IMRAM) Tohoku UniversitySendai 980-8577Japan

Hydrogen is a promising renewable energy source for fossil-free transportation and electrical energy ***,leaking hydrogen in high-temperature production processes can cause an explosion,which endangers production workers and surrounding *** detect leaks early,we used a sensor material based on a wide bandgap aluminum nitride(AlN)that can withstand a high-temperature *** unique AlN morphologies(rod-like,nest-like,and hexagonal plate-like)were synthesized by a direct nitridation method at 1400℃usingγ-AlOOH as a *** gas-sensing performance shows that a hexagonal plate-like morphology exhibited p-type sensing behavior and showed good repeatability as well as the highest response(S=58.7)toward a 750 ppm leak of H2 gas at high temperature(500°C)compared with the rod-like and nest-like ***,the hexagonal plate-like morphology showed fast response and recovery times of 40 and 82 s,*** surface facet of the hexagonal morphology of AlN might be energetically favorable for gas adsorption–desorption for enhanced hydrogen detection.

关键词： aluminum nitride controllable morphology direct nitridation γ-AlOOH hydrogen sensor