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Moving computational multi-domain method for modelling the flow interaction of multiple moving objects

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Advances in Aerodynamics 2022年第1期4卷 78-95页

作者： Momoha Nishimura Masashi Yamakawa Shinichi asao Seiichi Takeuchi Mehdi Badri Ghomizad Department of Mechanical and System Engineering Kyoto Institute of TechnologyKyotoJapan Department of Mechanical Engineering College of Industrial TechnologyHyogoJapan

This study proposes a method for modelling the flow interaction of multiple moving objects where the flow field variables are communicated between multiple separate moving computational *** of using the conventional approach with a single fixed computational domain covering the whole flow field,this method advances the moving computational domain(MCD)method in which the computational domain itself moves in line with the motions of an object *** computational domains created around each object move independently,and the flow fields of each domain interact where the flows *** eliminates the spatial restriction for simulating multiple moving ***,a shock tube test verifies that the overset implementation and grid movement do not adversely affect the results and that there is communication between the grids.A second test case is conducted in which two spheres are crossed,and the forces exerted on one object due to the other’s crossing at a short distance are *** results verify the reliability of this method and show that it is applicable to the flow interaction of multiple moving objects.

关键词： Crossing Moving boundary problems Compressible flow Moving mesh method

Flight simulation from takeoff to yawing of eVTOL airplane with coaxial propellers by fluid-rigid body interaction

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Advances in Aerodynamics 2023年第1期5卷 29-43页

作者： Ritsuka Gomi Ayato Takii Masashi Yamakawa Shinichi asao Seiichi Takeuchi Momoha Nishimura Department of Mechanical Engineering Kyoto Institute of TechnologyKyotoJapan Department of Mechanical Engineering College of Industrial TechnologyHyogoJapan

In this study,we adopt a coupled fluid-rigid body simulation using the moving computational domain method and multi-axis sliding mesh method for the takeoff,hovering,and yawing flight of an electric vertical takeoff and landing aircraft(eVTOL).The aircraft model has four pairs of coaxial propellers,and the computational domain is divided into three domains to move the aircraft and eight propeller domains to rotate the *** a result,we clarify the behavior and aerodynamic force of the aircraft when the input values are determined by the automatic *** results in the flow field also show that the downwash spreads in a crisscross pattern on the ground,the wind reaches different ranges on the ground depending on the flight altitude,and that the coaxial propeller causes an asymmetry in the velocity field during ***-quently,we conclude that this method is effective for the flight simulation of an eVTOL.

关键词： Computational fluid dynamics Moving grid Coupled simulation Flying car eVTOL

Mechanism of gastrointestinal abnormal motor activity induced by cisplatin in conscious dogs

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World Journal of Gastroenterology 2014年第42期20卷 15691-15702页

作者： Hiroyuki Ando Erito Mochiki Tetsuro Ohno Mitsuhiro Yanai Yoshitaka Toyomasu Kyoichi Ogata Yuichi Tabe Ryuusuke Aihara Toshihiro Nakabayashi Takayuki asao Hiroyuki Kuwano Department of General Surgical Science Gunma University Graduate School of Medicine

AIM: To investigate whether 5-hydroxytryptamine (serotonin; 5-HT) is involved in mediating abnormal motor activity in dogs after cisplatin administration.

关键词： Cisplatin Emesis 5-hydroxytryptamine Abnormal motor activity Dog

Assessment of Non-Contact Measurement Using a Microwave Sensor to Jugular Venous Pulse Monitoring

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Journal of Biomedical Science and Engineering 2021年第3期14卷 94-102页

作者： Satoshi Suzuki Masaaki Hoshiga Kentaro Kotani Takafumi asao Faculty of Engineering Science Kansai University Osaka Japan Faculty of Medicine Osaka Medical College Osaka Japan

The jugular venous pulse (JVP) waveform provides an insight into right heart function, and its assessment is important in patients with heart failure. However, the conventional pulse-transducer (contact) method for monitoring this waveform is not frequently used because it requires a high degree of skill. The aim of this study was to confirm the effectiveness of a prototype non-contact system that employs microwave radar (24 GHz, 7 mW;non-contact system) for JVP measurement. Experiments were conducted on eight healthy male volunteers (21.88 ± 0.99 years). JVP measurements were compared between the conventional contact method and the proposed non-contact method. Change in JVP waveform was measured in response to an angle of reclining in five steps from the supine position to 75° of elevation. The obtained JVP measurements were similar between the two methods. Because in the non-contact method the faint pulsation of the JVP is not suppressed by the pressure of a sensor placed on the skin, the prototype microwave radar system is particularly suitable for evaluating the JVP waveform.

关键词： Microwave Radar Non-Contact Monitoring Jugular Venous Pressure Right Heart Function

Winning speeches of the 39th Chinese Speech Contest of All Japan

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Voice of Friendship 2022年第1期 46-49页

作者： Urara asao Yuka Matsuki Miyu Minegishi 不详

On Jan 9,2022,the 39th Chinese Speech Contest of All Japan,hosted by the Japan-China Friendship Association,was successfully *** intense competition in the preliminaries and finals,19 candidates won prizes in the high school,social and college *** asao(college group),Yuka Matsuki(social group)and Miyu Minegishi(high school group)won top prizes and were awarded the China-Japan Friendship Association Medals.

关键词： Japan college prize

An investigation using high-precision CCD laser displacement sensor to measure body surface motion induced by heartbeat

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Journal of Biomedical Science and Engineering 2012年第11期5卷 672-677页

作者： Satoshi Suzuki Takemi Matsui Takafumi asao Kentaro Kotani Department of Management Systems Engineering Faculty of System Design Tokyo Metropolitan University Tokyo Japan Department of Mechanical Engineering Faculty of Engineering Science Kansai University Osaka Japan

The aim of this study was to measure the motion of the body surface induced by heartbeat by using a high-precision laser sensor in order to provide a reference for other research on medical remote sensing techniques that are unconstrained and non-contact. Body surface motions at some points on the chest and on the dorsal region were measured for eight men with a laser displacement sensor. For comparison, an electrocardiograph was also used to monitor the heartbeat. As a result, we confirmed cyclic motion of about 0.1 mm in amplitude everywhere on the body surface, not only from the front of the body but also from the back and the neck. In contrast, which part on the body was most suitable for measurement had to be taken into account because a difference in motion amplitudes was observed in different parts on the body. The amplitude of the motions also depended on the conditions of the body surface as well as underneath the skin. These results show the possibility of acquiring information about heartbeats from anywhere on the body by using an unconscious sensing technique, and the potential for the technique to monitor the condition of the body and personal physical characteristics.

关键词： Unconstrained Sensing Heart Rate Body Surface Motion

Adverse Effects of Allelopathy from Legume Crops and Its Possible Avoidance

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American Journal of Plant Sciences 2015年第6期6卷 804-810页

作者： Md. Fuad Mondal Md. Asaduzzaman Toshiki asao Department of Agriculture Shimane University Shimane Japan United Graduate School of Agricultural Sciences Tottori University Tottori Japan Sylhet Agricultural University Sylhet Bangladesh

Plant releases many bioactive chemicals from its various parts such as leaves, stem, root and sometimes decomposed body through different mechanism into its surrounding environment. These bioactive chemicals are often termed as allelochemicals because they interact with the surrounding environment. This interaction is either positive or negative. Effects of allelochemicals to the agricultural and biological ecosystem are well documented. In leguminosae family many species are involved in releasing of allelochemicals. Many researchers found that this allelochemicals have both positive and detrimental effects on the successive legume crops. Legume monoculture is common in many parts of the world where they cause a numbers of ecological and economic problems such as decline in crop yield due to soil sickness, regeneration failure and replant problem. These negative effects of allelochemicals open a great concern on allelopathy research. This article reviews the adverse effects of allelochemicals, their extraction and isolation, mechanism inside the plant body. These all are done to find out the possible selection methods of succeeding crops to avoid the allelopathic effects in the next crop of a monoculture farm field. The main purpose of this article is to highlight the adverse allelopathic effects of legume crops to provide ways for sustainable development in agro-ecosystem.

关键词： Allelopathy Allelochemicals Replant Injury Succeeding Crops

Noncontact Monitoring of Relative Changes in Blood Pressure Using Microwave Radar Sensors

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Journal of Biomedical Science and Engineering 2022年第1期15卷 51-65页

作者： Satoshi Suzuki Guanghao Sun Masaaki Hoshiga Kentaro Kotani Takafumi asao Faculty of Engineering Science Kansai University Osaka Japan Graduate School of Informatics and Engineering The University of Electro-Communications Tokyo Japan Faculty of Medicine Osaka Medical College Osaka Japan

This study aims to confirm whether noncontact monitoring of relative changes in blood pressure can be estimated using microwave radar sensors. First, an equation to estimate blood pressure was derived, after which, the effectiveness of the estimation equation was confirmed using data obtained by a noncontact method while inducing variations in blood pressure. We considered that the Bramwell-Hill equation, which contains some parameters that directly indicate changes in blood pressure, would be an appropriate reference to construct an estimation equation for the noncontact method, because measurements using microwave radar sensors can measure minute scale motion on the skin surface induced by the pulsation of blood vessels. In order to estimate relative changes in blood pressure, we considered a simple equation including the pulse transit time (PTT), amplitude of signals and body dimensions as parameters. To verify the effectiveness of the equation for estimating changes in blood pressure, two experiments were conducted: a cycling task using an ergometer, which induces blood pressure fluctuations because of changes in cardiac output, and a task using the Valsalva maneuver, which induces blood pressure fluctuations because of changes in vascular resistance. The results obtained from the two experiments suggested that the proposed equation using microwave radar sensors can accurately estimate relative changes of blood pressure. In particular, relatively favorable results were obtained for the changes in blood pressure induced by the changes in cardiac volume. Although many issues remain, this method could be expected to contribute to the continuous evaluation of cardiac function while reducing the burden on patients.

关键词： Microwave Radar Noncontact Monitoring Blood Pressure Relative Change Continuous Monitor

An approach to a non-contact vital sign monitoring using dual-frequency microwave radars for elderly care

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Journal of Biomedical Science and Engineering 2013年第7期6卷 704-711页

作者： Satoshi Suzuki Takemi Matsui Masayuki Kagawa Takafumi asao Kentaro Kotani Department of Management Systems Engineering Faculty of System Design Tokyo Metropolitan University Tokyo Japan Department of Mechanical Engineering Faculty of Engineering Science Kansai University Osaka Japan

This study aimed to produce a prototype system for non-contact vital sign monitoring of the elderly using microwave radar with the intention of reducing the burdens on monitored individuals and nursing caregivers. In addition, we tested the ability of the proposed prototype system to measure the respiratory and heart rates of the elderly in a nursing home and discussed the systems effectiveness and problems by examining results of real-time monitoring. The prototype system consisted of two 24-GHz microwave radar antennas and an analysis system. The antennas were positioned below a mattress to monitor motion on the body surface for measuring cardiac and respiratory rates from the dorsal side of the subjects (23.3 ± 1.2 years) who would be lying on the mattress. The heart rates determined by the prototype system correlated significantly with those measured by electrocardiography (r = 0.92). Similarly, the respiratory rates determined by the prototype correlated with those obtained from respiration curves (r = 0.94). Next, we investigated the effectiveness of the prototype system with 7 elderly patients (93.3 ± 10.56 years) at a nursing home. The proposed system appears to be a promising tool for monitoring the vital signs of the elderly in a way that alleviates the need to attach electrodes overnight to confirm patient safety.

关键词： Non-Contact Sensing Vital Signs Microwave Radar Elderly Care