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Water Wave Focusing Using Coordinate Transformation

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Journal of Energy and Power Engineering 2017年第10期11卷 631-636页

作者： Takahito Iida masashi Kashiwagi Department of Naval Architecture and Ocean Engineering Osaka University Osaka 5650871 Japan Research Fellow (DC1) of Japan Society for the Promotion of Science Osaka 5650871 Japan

In this paper, wave focusing based on a coordinate transformation is proposed. It is known that the 2-dimensional wave equation which governs a shallow water problem in a potential theory can keep invariance under coordinate transformation. Once equivalent medium parameters are obtained so as to keep the invariance, wave rays can be arbitrarily designed. We show the design of equivalent medium for wave squeezing to focus waves on a specific domain. Numerical computations are carried out by a finite element based software COMSOL Multiphysics. Results show good agreement between predictions from the theory and computations. It can be applied for a wide range of frequency because the proposed method is able to be applied regardless of the frequency.

关键词： Coordinate transformation wave focusing shallow water.

On the Tempo-Spatial Evolution of the Lower Ionospheric Perturbation for the 2016 Kumamoto Earthquakes from Comparisons of VLF Propagation Data Observed at Multiple Stations with Wave-Hop Theoretical Computations

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Open Journal of Earthquake Research 2018年第3期7卷 161-185页

作者： Tomokazu Asano masashi Hayakawa Hayakawa Institute of Seismo Electromagnetics Co. Ltd. (Hi-SEM) University of Electro-Communications (UEC) Alliance Center 1-1-1 Kojima-cho Chofu Japan Advanced Wireless & Communications Research Center UEC Chofu Japan

There have been published many papers on VLF (very low frequency) characteristics to study seismo-ionospheric perturbations. Usually VLF records (amplitude and/or phase) are used to investigate mainly the temporal evolution of VLF propagation anomalies with special attention to one particular propagation path. The most important advantage of this paper is the simultaneous use of several propagation paths. A succession of earthquakes (EQs) happened in the Kumamoto area in Kyusyu Island;two strong foreshocks with magnitude of 6.5 and 6.4 on 14 April (UT) and the main shock with magnitude 7.3 on 15 April (UT). Because the EQ epicenters are not far from the VLF transmitter (with the call sign of JJI in Miyazaki prefecture), we can utilize simultaneously 8 observing stations of our network all over Japan. Together with the use of theoretical computations based on wave-hop theory, we try to trace both the temporal and spatial evolutions of the ionospheric perturbation associated with this succession of EQs. It is found that the ionospheric perturbation begins to appear about two weeks before the EQs, and this perturbation becomes most developed 5 - 3 days before the main shock. When the perturbation is most disturbed, the maximum change in vertical direction is depletion in the VLF effective ionospheric height of the order of 10 km, and its horizontal scale (or its radius) is about 1000 km. These spatio-temporal changes of the seismo-ionospheric perturbation will be investigated in details in the discus-sion, a comparison has made with the VLF characteristics of the 1995 Kobe with the same magnitude and of the same fault-type, and a brief discussion on the generation mechanism of seismo-ionospheric perturbation is finally made.

关键词： VLF/LF Propagation Anomaly Ionospheric Perturbations Earthquake Precursor Earthquake Prediction the 2016 Kumamoto Earthquakes Japanese VLF/LF Network Wave-Hop Computation Nighttime Fluctuation Method Atmospheric Oscillation Hypothesis

Boosting and margin theory

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Frontiers of Electrical and Electronic Engineering in China 2012年第1期7卷 127-133页

作者： Jufu FENG Liwei WANG masashi SUGIYAMA Cheng YANG Zhi-Hua ZHOU Chicheng ZHANG Key Laboratory of Machine Perception MOE School of Electron- ics Engineering and Computer Science Peking University Beijing 100871 China Department of Computer Science Tokyo Institute of TechnologyTokyo 152-8552 Japan National Key Laboratory for Novel Software Technology NanjingUniversity Nanjing 210093 China

Many researchers have worked on the ex- planation of AdaBoost＇s good experimental results in theory. Some work give an upper bound of generaliza- tion error in terms of the margin distribution function, while Breiman gave a sharper generalization error bound based on minimum margin. He also developed the arc- gv algorithm to maximize the minimum margin, then made the minimum margin larger than AdaBoost. How- ever, its empirical results are even worse than AdaBoost. Therefore, is the minimum margin bound not practi- cal？ This paper gives a new concept called Equilibrium margin （Emargin） and proves a new generalization er- ror bound using Emargin, which is always better than minimum margin bound. In addition, we show Emargin is a good indicator of generalization. Then, we conduct experiments showing that the Emargin of AdaBoost is larger than arc-gv, but the generalization error of Ada- Boost is usually better.

关键词： boosting margin explanation generalization

No external load measurement strategy for micro thermoelectric generator based on high-performance Si_(1-x-y)Ge_(x)Sn_(y) film

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Journal of Materiomics 2021年第4期7卷 665-671页

作者： Ying Peng Sijing Zhu Huajun Lai Jie Gao masashi Kurosawa Osamu Nakatsuka Sakae Tanemura Biaolin Peng Lei Miao Guangxi Key Laboratory of Information Material School of Material Science and EngineeringGuilin University of Electronic TechnologyGuilin541004China Department of Materials Physics Graduate School of EngineeringNagoya UniversityNagoya464-8603Japan PRESTO Japan Science and Technology Agency4-1-8HonchoKawaguchiSaitama332-0012Japan Institute of Materials and Systems for Sustainability Nagoya UniversityNagoya464-8601Japan Japan Fine Ceramics Center 2-4-1 MutsunoAtsuta-kuNagoya456-8587Japan Center on Nanoenergy Research Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured MaterialsGuangxi Key Laboratory for Relativity AstrophysicsNanning530004China Department of Materials Science and Engineering SIT Research LaboratoriesInnovative Global ProgramFaculty of EngineeringShibaura Institute of TechnologyTokyo135-8548Japan

In this study,a micro in-plane p-type thermoelectric generator(TEG),which consists of thin-film Si_(1-x-y)Ge_(x)Sn_(y) ternary alloy semiconductor on insulator,is developed to make efficient use of waste heat such as human body.A power factor value as high as 1095 mWm^(-1) K^(-2) had been achieved using Bion implanted and short-term rapid thermal annealing(RTA)*** addition,a measuring scheme for micro TEG without external load resistance was *** one measuring session,multiple parameters can be *** micro single-arm TEG prepared by semiconductor process can output 0.29 nW power at a temperature difference of 15 K,and a cross-sectional power density has reached up to 0.58 mW/cm^(2),which is a superior value for wearable *** findings of this study have important reference value for wearable device performance improvement and output power measuring of micro TEG.

关键词： Si_(1-x-y)Ge_(x)Sn_(y) film P-type TEG No external load measurement Ambient power density

Comparison of Hemodynamic Responses Associated with Tracheal Intubation Under Various Induction Doses of Remifentanil and Propofol

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Open Journal of Anesthesiology 2012年第4期2卷 154-160页

作者： Toru Goyagi masashi Yoshimoto Department of Anesthesia and Intensive Care Medicine Akita University Graduate School of Medicine Akita Japan

.Background: The optimal dose of propofol and remifentanil induction to minimize the cardiovascular response associated with tracheal intubation may exist. We investigated the cardiovascular response associated with tracheal intubation when various continuous induction doses of remifentanil in combination with propofol were used. Methods: Seventy- five patients were randomly allocated into 1 of 3 groups: the R-0.4 P-1 group (remifentanil 0.4 μg/kg/min and propofol 1 mg/kg);the R-0.5 P-1 group (remifentanil 0.5 μg/kg/min and propofol 1 mg/kg);and the R-0.4 P-2 group (remifentanil 0.4 μg/kg/min and propofol 2 mg/kg). One minute after remifentanil infusion commenced, a bolus of propofol was injected. Rocuronium 1 mg/kg was administered 1 min after propofol injection following loss of consciousness. Controlled ventilation was then performed for 2 min, and the trachea was intubated 4 min after the start of the remifentanil infusion. The infusion rate of remifentanil was decreased to 0.1 μg/kg/min after intubation. Blood pressure (BP) and heart rate (HR) were measured during this period until 5 min after tracheal intubation. Results: The changes in BP response due to tracheal intubation in the R-0.4 P-1 group were greater than those in the other 2 groups, whereas the HR responses to tracheal intubation were similar among the 3 groups. Conclusion: The combination of remifentanil 0.4 μg/kg/min and propofol 1 mg/kg led to an exaggerated cardiovascular response to tracheal intubation compared with the other combination groups.

关键词： Remifentanil Propofol Tracheal Intubation Presser Response

Fixed Point Theorem and Fractional Differential Equations with Multiple Delays Related with Chaos Neuron Models

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Applied Mathematics 2015年第13期6卷 2192-2198页

作者： Toshiharu Kawasaki masashi Toyoda Faculty of Engineering Tamagawa University Tokyo Japan

In this paper, we show a fixed point theorem which deduces to both of Lou’s fixed point theorem and de Pascale and de Pascale’s fixed point theorem. Moreover, our result can be applied to show the existence and uniqueness of solutions for fractional differential equations with multiple delays. Using the theorem, we discuss the fractional chaos neuron model.

关键词： Fixed Point Theorem Ordinary Differential Equation Delay Differential Equation Fractional Differential Equation Fractional Chaos Neuron Model

导电薄层下三维岩脉的CSAMT响应分析(英文)

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地球物理学报 2010年第3期53卷 677-684页

作者：王若 masashi Endo 底青云王妙月中国科学院地质与地球物理研究所中国科学院工程地质力学重点实验室北京100029 Consortium for Electromagnetic Modeling and Inversion(CEMI) University of Utah

为了研究探测3D导电岩脉状目标体的可控源音频电磁法(CSAMT)的最佳观测装置,我们用压缩积分方程法数值模拟了赋存于导电薄层下的3D导电岩脉的电磁场响应.计算结果表明,最有效的源的位置是把发射源沿岩脉的走向放置.相对于其他几种装置,... 详细信息

为了研究探测3D导电岩脉状目标体的可控源音频电磁法(CSAMT)的最佳观测装置,我们用压缩积分方程法数值模拟了赋存于导电薄层下的3D导电岩脉的电磁场响应.计算结果表明,最有效的源的位置是把发射源沿岩脉的走向放置.相对于其他几种装置,这种观测装置得到的异常场与主场的比值最大.利用这种最佳的观测装置,通过将异常场E_(ya)和H_(xa)与噪音作对比,研究了当岩脉的埋深和高度发生变化时岩脉的可探测性问题.当岩脉的顶部埋深增加时,导电岩脉的可探测性降低.岩脉高度的变化对异常场幅值的影响要小于岩脉顶部埋深所产生的影响.所以通常情况下,即便应用了最有效的CSAMT装置,也很难探测到岩脉的高度,应用钻孔中的探测可能会解决这个问题.

关键词： 3D岩脉模型压缩积分方程法最佳装置影响因素

Anomalous phenomena in DC–ULF geomagnetic daily variation registered three days before the 12 May 2008 Wenchuan M_S 8.0 earthquake

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Earth and Planetary Physics 2019年第4期3卷 330-341页

作者： Mei Li Li Yao YaLi Wang Michel Parrot masashi Hayakawa Jun Lu HanDong Tan Tao Xie China Earthquake Networks Center China Earthquake Administration Beijing 100045 China Laboratoire de Physique et Chimie de l’Environnement et de l’Espace Université d’Orléans CNRS Orléans France Hayakawa Institute of Seismo Electromagnetics Co. Ltd. University of Electro–Communications (UEC) Chofu Japan UEC Advanced Wireless Communications Research Center Chofu Japan School of Geophysics and Information Technology China University of Geosciences Beijing 100083 China

The hourly data of the vertical Z and the horizontal H components of 37 ground-based DC-ULF geomagnetic stations are examined during 20 April-12 May 2008. On 9 May 2008, three days before the Wenchuan MS 8.0 shock, anomalies-a double low-point and a decreased amplitude-are registered on the curves of the Z component at 25 stations in a large-scale area surrounding the Wenchuan epicentral area. The H component shows none of the double low-point phenomenon but does exhibit a reduced magnitude at the same time. The geomagnetic index Kp is also examined and indicates that the anomalies appear at a solar quiet period. The appearing time shift(Tzs) between the first low-point on May 9 and the minimum point occurring time of May 1-5, 2008 is also *** results show that Tzs is on the order of 1-2 hours earlier or later than usual and there is a 2-6 hours’ gap between these two lowpoints. However, there is still a transition area which includes the epicenter where Tzs=0. Variation amplitude examined on vertical Z increases as the distance from the epicenter decreases. An Earth-air-ionosphere model has been employed to investigate a possible mechanism of this phenomenon and positive results have been unexpectedly attained. All these above-related results tend to prove that the variations of the Z and H on May 9, 2008 during the solar quiet period are probably associated with the forthcoming Wenchuan MS 8.0 earthquake.

关键词： Wenchuan MS 8.0 earthquake geomagnetic abnormity spatial variations Earth-air-ionosphere model

A Fistula between Coronary and Main Pulmonary Arteries with Chest Tightness

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World Journal of Cardiovascular Surgery 2015年第12期5卷 135-138页

作者： masashi Kawabori Atsushi Kurata Division of Cardiac Surgery Brigham and Women’s Hospital Harvard Medical School Boston MA USA Division of Cardiovascular Surgery Yamato Seiwa Hospital Yamato Japan

A 64-year-old woman presented to our facility with recurrent chest tightness. Angiography showed a dilated (10 mm) aneurysmal tortuous coronary artery fistula (CAF) to the main pulmonary arterial trunk occupying a large area of the anterior surface of the aortic root. Left and right heart catheterization showed high left-to-right shunt flow. Fissurectomy and coronary artery bypass grafting were performed. The patient had no postoperative complications and became asymptomatic. The outcome of our case shows that CAF should be a differential diagnosis of recurrent symptomatic cardiac ischemia. Intervention is indicated if symptoms or secondary complications develop.

关键词： Congenital Coronary Aneurysm Coronary Fistula Angina