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A computation design method for architectural artifacts adapted from traditional Kagome bamboo basketry techniques

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Frontiers of Architectural Research 2024年第2期13卷 249-264页

作者： Hiroyuki shinohara Tung Hoi Peter Chan School of Architecture The Chinese University of Hong KongHong KongChina

This study is a digital form-finding and manual fabrication experiment in woven architectural design,with one traditional weaving style,Kagome,used to scale the craft up into an architectural-scale bamboo woven artifact.Kagome is a trihexagonal pattern employed in traditional bamboo basketry as a triaxial weaving system,resulting in an object with a self-bracing capacity without the use of fasteners owing to its interlacing lattices.Although existing studies and tools have addressed triaxial weaving design and representation,the current consideration of the advantages of weaving with bamboo is insufficient.To address this research gap,this study develops a computational design method based on studies on bamboo basketry.This allows for the representation and exploration of design geometries using combinations of regular triangular meshes for the fabrication of Kagome woven bamboo artifacts.A full-scale mock-up was fabricated to evaluate the effectiveness of the method.The mock-up demonstrated the self-bracing properties of Kagome,but there were discrepancies between the mock-up and the design.Factors affecting bamboo weaving on an architectural scale have been identified within this study to inform future research on woven bamboo structures.

关键词： Traditionalbamboo craft Triaxialmaterial interlacing Bamboo Computational design methods Mesh block combinationsystem Architecturalwoven artifact

Microwave Energy Transmission Experiments and Study of Rectenna

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Microwave Energy Transmission Experiments and Study of Recte...

Varicella-zoster virus-associated meningitis,encephalitis,and myelitis with sporadic skin blisters:A case report

1996年中日联合微波技术会议

作者： Hiroshi MATSUMOTO naoki shinohara Radio Atmospheric Science Center Kyoto University 611 GokashoUji-shiKyoto-fuJapan

＜正＞1.Introduction An important milestone in the history of microwave power transmission was the three-year study program called the DOE/NASA Satellite Power System Concept Development and Evaluation Program,started in 1977.This program was conducted for the study of the Solar Power Satellite（SPS）,which is designed to beam down the electrical power of 5 to 10 GW from one SPS toward the rectenna site on the ground.The extensive study of the SPS ended in 1980[1].

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World Journal of Clinical Cases 2022年第2期10卷 717-724页

作者： Ken Takami Tsuneaki Kenzaka Ayako Kumabe Megumi Fukuzawa Yoko Eto Shun Nakata Katsuhiro shinohara Kazunori Endo Department of Internal Medicine Sainokuni Higashiomiya Medical CenterSaitama 331-8577SaitamaJapan Division of Community Medicine and Career Development Kobe University Graduate School of MedicineKobe 652-0032HyogoJapan Department of Neurology Sainokuni Higashiomiya Medical CenterSaitama 331-8577SaitamaJapan Department of Dermatology Sainokuni Higashiomiya Medical CenterSaitama 331-8577SaitamaJapan Emergency Department Sainokuni Higashiomiya Medical CenterSaitama 331-8577SaitamaJapan

BACKGROUND Varicella-zoster virus(VZV)generally causes chickenpox at first infection in childhood and then establishes latent infection in the dorsal root ganglia of the spinal cord or other nerves.Virus reactivation owing to an impaired immune system causes inflammation along spinal nerves from the affected spinal segment,leading to skin manifestations(herpes zoster).Viremia and subsequent hematogenous transmission and nerve axonal transport of the virus may lead to meningitis,encephalitis,and myelitis.One such case is described in this study.CASE SUMMARY A 64-year-old man presented with dysuria,pyrexia,and progressive disturbance in consciousness.He had signs of meningeal irritation,and cerebrospinal fluid(CSF)analysis revealed marked pleocytosis with mononuclear predominance and a CSF/serum glucose ratio of 0.64.Head magnetic resonance imaging revealed hyperintense areas in the frontal lobes.He had four isolated blisters with papules and halos on his right chest,right lumbar region,and left scapular region.Infected giant cells were detected using the Tzanck test.Degenerated epidermal cells with intranuclear inclusion bodies and ballooning degeneration were present on skin biopsy.Serum VZV antibody titers suggested previous infection,and the CSF tested positive for VZV-DNA.He developed paraplegia,decreased temperature perception in the legs,urinary retention,and fecal incontinence.The patient was diagnosed with meningitis,encephalitis,and myelitis and was treated with acyclovir for 23 days and prednisolone for 14 days.Despite gradual improvement,the urinary retention and gait disturbances persisted as sequelae.CONCLUSION VZV reactivation should be considered in differential diagnoses of patients with sporadic blisters and unexplained central nervous system symptoms.

关键词： Varicella-zoster virus Encephalitis Meningitis Myelitis Central nervous system Case report

Exact Solutions of the Cubic Duffing Equation by Leaf Functions under Free Vibration

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Computer Modeling in Engineering & Sciences 2018年第5期115卷 149-215页

作者： Kazunori shinohara Daido University 10-3 Takiharu-choMinami-kuNagoya 457-8530Japan

Exact solutions of the cubic Duffing equation with the initial conditions are presented.These exact solutions are expressed in terms of leaf functions and trigonometric functions.The leaf function r=sleafn(t)or r=cleafn(t)satisfies the ordinary differential equation dx2/dt2=-nr2n-1.The second-order differential of the leaf function is equal to-n times the function raised to the(2n-1)power of the leaf function.By using the leaf functions,the exact solutions of the cubic Duffing equation can be derived under several conditions.These solutions are constructed using the integral functions of leaf functions sleaf2(t)and cleaf2(t)for the phase of a trigonometric function.Since the leaf function and the trigonometric function are used in combination,a highly accurate solution of the Duffing equation can be easily obtained based on the data of leaf functions.In this study,seven types of the exact solutions are derived from leaf functions;the derivation of the seven exact solutions is detailed in the paper.Finally,waves obtained by the exact solutions are graphically visualized with the numerical results.

关键词： Duffing equation nonlinear equations ordinary differential equation leaf functions

Damped and Divergence Exact Solutions for the Duffing Equation Using Leaf Functions and Hyperbolic Leaf Functions

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Computer Modeling in Engineering & Sciences 2019年第3期118卷 599-647页

作者： Kazunori shinohara Daido University 10-3 Takiharu-choMinami-kuNagoya 457-8530Japan

According to the wave power rule,the second derivative of a functionχ(t)with respect to the variable t is equal to negative n times the functionχ(t)raised to the power of 2n?1.Solving the ordinary differential equations numerically results in waves appearing in the figures.The ordinary differential equation is very simple;however,waves,including the regular amplitude and period,are drawn in the figure.In this study,the function for obtaining the wave is called the leaf function.Based on the leaf function,the exact solutions for the undamped and unforced Duffing equations are presented.In the ordinary differential equation,in the positive region of the variableχ(t),the second derivative d^2χ(t)/dt^2 becomes negative.Therefore,in the case that the curves vary with the time under the conditionχ(t)>0,the gradient dχ(t)/d constantly decreases as time increases.That is,the tangential vector on the curve of the graph(with the abscissa and the ordinate χ(t)changes from the upper right direction to the lower right direction as time increases.On the other hand,in the negative region of the variableχ(t),the second derivative d^2χ(t)/dt^2 becomes positive.The gradient d χ(t)/d constantly increases as time decreases.That is,the tangent vector on the curve changes from the lower right direction to the upper right direction as time increases.Since the behavior occurring in the positive region of the variable χ(t)and the behavior occurring in the negative region of the variableχ(t)alternately occur in regular intervals,waves appear by these interactions.In this paper,I present seven types of damped and divergence exact solutions by combining trigonometric functions,hyperbolic functions,hyperbolic leaf functions,leaf functions,and exponential functions.In each type,I show the derivation method and numerical examples,as well as describe the features of the waveform.

关键词： Leaf functions hyperbolic leaf functions lemniscate functions jacobi elliptic functions ordinary differential equations duffing equation nonlinear equations

Addition Formulas of Leaf Functions and Hyperbolic Leaf Functions

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Computer Modeling in Engineering & Sciences 2020年第5期123卷 441-473页

作者： Kazunori shinohara Department of Mechanical Systems Engineering Daido UniversityNagoya457-8530Japan

Addition formulas exist in trigonometric functions.Double-angle and half-angle formulas can be derived from these formulas.Moreover,the relation equation between the trigonometric function and the hyperbolic function can be derived using an imaginary number.The inverse hyperbolic function arsinher(r)■ro 1/√1+t^(2)dt p1tt2 dt is similar to the inverse trigonometric function arcsiner(r)■ro 1/√1+t^(2)dt p1t2 dt,such as the second degree of a polynomial and the constant term 1,except for the sign−and+.Such an analogy holds not only when the degree of the polynomial is 2,but also for higher degrees.As such,a function exists with respect to the leaf function through the imaginary number i,such that the hyperbolic function exists with respect to the trigonometric function through this imaginary number.In this study,we refer to this function as the hyperbolic leaf function.By making such a definition,the relation equation between the leaf function and the hyperbolic leaf function makes it possible to easily derive various formulas,such as addition formulas of hyperbolic leaf functions based on the addition formulas of leaf functions.Using the addition formulas,we can also derive the double-angle and half-angle formulas.We then verify the consistency of these formulas by constructing graphs and numerical data.

关键词： Leaf functions hyperbolic leaf functions lemniscate functions Jacobi elliptic functions ordinary differential equations nonlinear equations

Lemniscate of Leaf Function

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Computer Modeling in Engineering & Sciences 2021年第1期126卷 275-292页

作者： Kazunori shinohara Department of Mechanical Systems Engineering Daido University10-3 Takiharu-choMinami-kuNagoya457-8530Japan

A lemniscate is a curve defined by two foci,F_(1) and F_(2).If the distance between the focal points of F_(1)−F_(2) is 2a(a:constant),then any point P on the lemniscate curve satisfy the equation PF_(1)·PF_(2)=a^(2).Jacob Bernoulli first described the lemniscate in 1694.The Fagnano discovered the double angle formula of the lemniscate(1718).The Euler extended the Fagnano’s formula to a more general addition theorem(1751).The lemniscate function was subsequently proposed by Gauss around the year 1800.These insights were summarized by Jacobi as the theory of elliptic functions.A leaf function is an extended lemniscate function.Some formulas of leaf functions have been presented in previous papers;these included the addition theorem of this function and its application to nonlinear equations.In this paper,the geometrical properties of leaf functions at n=2 and the geometric relation between the angle θ and lemniscate arc length l are presented using the lemniscate curve.The relationship between the leaf functions sleaf_(2)(l)and cleaf_(2)(l)is derived using the geometrical properties of the lemniscate,similarity of triangles,and the Pythagorean theorem.In the literature,the relation equation for sleaf_(2)(l)and cleaf_(2)(l)(or the lemniscate functions,sl(l)and cl(l))has been derived analytically;however,it is not derived geometrically.

关键词： Geometry lemniscate of Bernoulli leaf functions lemniscate functions Pythagorean theorem triangle similarity

Extraction of yarn positional information from three-dimensional CT image of textile fabric using a yarn model for its structure analysis

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仪器仪表学报 2008年第8期29卷 1569-1576页

作者： Toshihiro shinohara Jun-ya Takayama Shinji Ohyama Akira Kobayashi School of Biology-Oriented Science and Technology Kinki University Kinokawa-shi Wakayama-kenJapan Graduate School of Science and Engineering Tokyo Institute of Technology1-12-1 Meguro-kuTokyoJapan Faculty of University Evaluation and Research National Institution for Academic Degrees and UniversityEvaluation Kodaira-shi TokyoJapan

This paper proposes a novel method for analyzing a textile fabric structure to extract positional information regarding each yarn using three-dimensional X-ray computed tomography(3D CT) image.Positional relationship among the yarns can be reconstructed using the extracted yarn positional information.In this paper,a sequence of points on the center line of each yarn of the sample is defined as the yarn positional information,since the sequence can be regarded as the representative position of the yarn.The sequence is extracted by tracing the yarn.The yarn is traced by estimating the yarn center and direction and correlating the yarn part of the 3D CT image with a 3D yarn model,which is moved along the estimated yarn direction.The trajectory of the center of the yarn model corresponds to the positional information of the yarn.The application of the proposed method is shown by experimentally applying the proposed method to a 3D CT image of a double-layered woven fabric.Furthermore,the experimental results for a plain knitted fabric show that this method can be applied to even knitted fabrics.

关键词：纺织品 CT影像分析方法物理结构

Experimental Study of the Flow in Helical Circular Pipes:Torsion Effect on the Flow Velocity and Turbulence

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Journal of Thermal Science 2008年第3期17卷 193-198页

作者： Yasutaka HAYAMIZU Kyoji YAMAMOTO ShinichiroYANASE Toru HYAKUTAKE Toru shinohara Shinichi MORITA Department of Mechanical Engineering Yonago National College of Technology Graduate School of Natural Science and Technology Okayama University

现在的纸的一个目的是试验性地在螺旋状的圆形的管子中在流动上澄清扭转效果。我们使六成为了有不同程度和大约 0.1 的普通非维的弯曲 δ 的螺旋状的圆形的管子。被 β0=τ/(2 δ) 定义的扭转参数 β0, 有非维的扭转 τ 的 1/2 ，被拿是... 详细信息

现在的纸的一个目的是试验性地在螺旋状的圆形的管子中在流动上澄清扭转效果。我们使六成为了有不同程度和大约 0.1 的普通非维的弯曲 δ 的螺旋状的圆形的管子。被 β0=τ/(2 δ) 定义的扭转参数 β0, 有非维的扭转 τ 的 1/2 ，被拿是 0.02， 0.45， 0.69， 1.01， 1.38 和 1.89 盖住从对很大的沥青小。速度分布和流动的骚乱从 200 ～ 20000 在雷纳兹数字的范围用一张 X 类型热电线的风速表被测量。获得的结果如下被总结：在管子的生气的节的吝啬的第二等的流动模式从没有扭转(toroidal 管子) ，在之一以后在一根弄弯的管子中被看见到一种单个旋涡类型的一种平常的成双旋涡的类型变化成双旋涡当 β0 增加，逐渐地消失。单个旋涡的循环方向与管子的扭转的方向一样。轴流的吝啬的速度分发类似于在小 β0, 的 toroidal 管子的，但是当 β0 在一根笔直地圆形的管子中增加，并且到达类似于那的形状，改变它的形状什么时候 β0= 1.89。这也被发现批评雷纳兹数字，流动在显示出边缘的行为到骚乱，为小 β0, 作为 β0 增加减少然后在拿在 β0≈ 的最小以后增加1.4 作为 β0 增加。试验性地获得的批评雷纳兹数字的最小在 β0≈ 是大约 4001.4。

关键词：扭转效果螺旋管道湍流物理学