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Effect of loading rate on mechanical behavior of SRC shearwalls
Fumiya Esaki,Masayuki Ono 국제구조공학회 2001 Steel and Composite Structures, An International J Vol.1 No.2
In order to investigate the effect of the loading rate on the mechanical behavior of SRC shearwalls, we conducted the lateral loading tests on the 1/3 scale model shearwalls whose edge columns were reinforced by H-shaped steel. The specimens were subjected to the reversed cyclic lateral load under a variable axial load. The two types of loading rate, 0.01 cm/sec for the static loading and 1 cm/sec for the dynamic loading were adopted. The failure mode in all specimens was the sliding shear of the in-filled wall panel. The edge columns did not fail in shear. The initial lateral stiffness and lateral load carrying capacity of the shearwalls subjected to the dynamic loading were about 10% larger than those subjected to the static loading. The effects of the arrangement of the H-shaped steel on the lateral load carrying capacity and the lateral load-displacement hysteresis response were not significant.
Effect of the Inspiratory Method and Timing of Voluntary Cough on Peak Cough Flow
Fumiya Kotajima,Masakiyo Yatomi,Takeshi Hisada 대한재활의학회 2023 Annals of Rehabilitation Medicine Vol.47 No.2
Objective To define the effect of the inspiratory method and cough timing on peak cough flow (PCF). Methods We investigated the effect of measurement conditions on PCF in healthy subjects (n=10). We then compared obstructive and restrictive pulmonary diseases (n=20) to assess for similar results in respiratory diseases. The PCF was measured under four conditions: before coughing, without maneuver 1 or with maneuver 2 a temporary respiratory pause (4–6 seconds) after rapid inspiration, and without maneuver 3 or with maneuver 4 a temporary respiratory pause after slow inspiration. After the measurements were completed, the PCF between the four conditions was compared for each subject group, and the effect size was calculated. Results PCF of maneuvers 1 and 3 were significantly higher than maneuver 4 in healthy subjects (476.34±102.05 L/min and 463.44±107.14 L/min vs. 429.54±116.83 L/min, p<0.01 and p<0.05, respectively) and patients with restrictive pulmonary disease (381.96±145.31 L/min, 354.60±157.36 L/min vs. 296.94±137.49 L/min, p<0.01 and p<0.05, respectively). In obstructive pulmonary disease, maneuver 1 was significantly higher than maneuver 4 (327.42±154.73 L/min vs. 279.48±141.10 L/min, p<0.05). The largest effect sizes were shown by maneuvers 4 and 1. Conclusion PCF depends on changes in inspiratory speed before coughing and on temporary respiratory pauses after maximal inspiration. It will become necessary to unify the measurement methods for coughing strength and present appropriate coughing methods.
Fumiya Tsutsui,Keiichi Kitamura,Satoshi Nonaka 한국항공우주학회 2022 International Journal of Aeronautical and Space Sc Vol.23 No.4
A slender-bodied vehicle with asymmetrically arranged protuberance generates strong side force due to asymmetric vortices, even at a low angle-of-attack. We investigated effects of the well-known RANS turbulence models [SA-R (Crot = 0.0, 1.0, and 2.0), SST, and SST-2003] by comparing the numerically obtained side force values on supersonic slender-body, along with the flow structure. As a result, all the SA-R models showed good agreement with the experiment regardless of the Crot (which controls the degree of modification from the original SA model), although a separation point on the protuberance side slightly changed depending on the Crot value. On the other hand, as for the SST models, when the vorticity was used to evaluate eddy viscosity (original SST) the side force exhibit 44% deviation from the experiment, whereas SST-2003, in which the strain rate was employed instead, significantly reduced the discrepancy to 0.7%.
Absolute positioning control of indoor flying robot using ultrasonic waves and verification system
Fumiya Sato,Yuta Motomura,Chinthaka Premachandra,Kiyotaka Kato 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
Currently, absolute positioning methods for indoor flying robots use multiple cameras to measure position through image processing. However, such systems are large scale and costly. Therefore, we have developed a measurement and control system that uses ultrasonic waves. The system consists of a ground base with three ultrasonic transmitter units and a flying robot. The flying robot is equipped with onboard measurement and control devices. This system is small and inexpensive. This paper reports on a verification system that proved the effectiveness of the proposed system. The verification system resulted in improvements to the measurement and control devices. Then, the system realized autonomous flight using ultrasonic waves. This paper describes the details of the method for using ultrasonic waves to control the positioning of an indoor flying robot, the newly developed hardware and software that enable the autonomous flight, and the results of a flight experiment.
Structural and Elastic Properties of the Magnetic Shape Memory Ni2MnGa1−xInx Alloy
Fumiya Kitanishi,Kohji Nakamura,Toru Akiyama,Tomonori Ito 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The structural and the elastic properties of the magnetic shape memory Ni2MnGa1−xInx (x 0.25) alloy were investigated from first principles calculations within the generalized gradient approximationby using the full-potential linearized augmented plane-wave method and the Connolly-Williams cluster expansion method. The calculated lattice constant and bulk modulus have analmost linear dependence on the In composition x, where the former increases and the latter decreaseswhen x increases. In contrast, the calculated shear modulus, C0 = (C11 − C12)/2, of thedisordered state, which shows a nonlinear dependence on x, indicates that a deviation from thestoichiometric composition Ni2MnGa (x = 0) enhances the elastic tetragonal anisotropy.
A Flicker-less Method Detecting the Cue Stick for a System Predicting the Path of the Billiard balls
Fumiya Takata,Akira Suganuma 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
Billiards is a game which players try to hit the balls into pocket with cue stick. Some beginner players may feel difficult to play billiards, because not predicting the path of the balls. Therefore we developed a supporting system for them. The system distinguishes among the balls, detects the cue stick and projects the path of the balls on the table by using a camera, projector and image processing. Consequently, the beginners can visually predict the path of each ball. Our system enabled players to see the movement of each ball before they shot the cue ball.