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Hiroto Honda(Hiroto Honda ),Reina Maeda(Reina Maeda ),Suguru Ando(Suguru Ando ),Kenji Shinbo(Kenji Shinbo ),Wataru Nanikawa(Wataru Nanikawa ),Masaki Iwamura(Masaki Iwamura ),Yoshihiro Yamashina(Yoshih 사피엔시아 2020 Exercise Medicine Vol.4 No.-
Objectives: Little is known regarding the associations between Borg’s rating of perceived exertion (RPE), cardiopulmonary responses, and carrying bags while level walking. We investigated the changes in RPE and cardiopulmonary responses, including energy cost (EC), oxygen consumption (VdotO₂), and heart rate (HR), when walking with a bag. Methods: This randomized crossover study included 10 healthy adults (aged 21–22 years). Four days of experiments were performed at intervals of 1–2 weeks. The participants walked on a level treadmill while carrying a bag with a strap weighting 5 kg, placed diagonally on their shoulders (DS), vertically on their shoulders (VS), vertically in one hand (VH), and on their backs using both shoulders (BS) for 20 min. Walking speed was stable among all experiments, and was set to the participants’ preferred speed. Results: No significant differences between bag carrying methods regarding EC, VdotO₂, and %HRreserve (based on HR) were observed, whereas RPE respiratory (RPE-resp) and RPE leg muscle (RPE-leg) scores varied based on bag carrying method used. RPE-resp score was significantly lower for DS and BS than VH (both p < 0.0083); however, no significant difference was observed when each RPE-leg score was compared. Conclusions: We found that RPE-resp score varied, whereas no changes in EC, VdotO₂, and HR were observed in healthy adults while walking with different bag carrying methods. Additionally, of all bag carrying methods assessed, the highest RPE-resp score was observed when individuals carried a bag with one-hand at their side.
조병민,Maeda Masaki,김태진 한국지진공학회 2015 한국지진공학회논문집 Vol.19 No.2
The purpose of this study is to improve the previous damage evaluation model for RC members which is proposed by Igarashi[1] in 2010.The previous model was not confirmed by enough data of damage such as, residual crack length, width and area for exfoliation of concrete, etc. In addition, validation of the model is still insufficient. Therefore, experiment of a real-scale RC structure and experiment of RC columns using the high-strength concrete were conducted to gather the data of damage in RC members. The investigation has been conducted gathering the data not only additional experiments data but also existing data for modification of damage evaluation model. It has been investigated on changing damage in RC due to axial force ratio, shear reinforcement and shear span ratio. As a result, several problems were founded in the previous model, such as, hinge length(lp), spacing of flexural crack(Sav,f), total width of flexural cracks regulated by maximum width of flexural crack(nf) and total width of shear cracks regulated by maximum width of shear crack(ns). New model is proposed and evaluated the damage properly.
Shogo Maeda,Shinsaku Kawabata,Itsuki Nagase,Ali Baratov,Masaki Ishiguro,Toi Nezu,Takahiro Igarashi,Kishi Sekiyama,Suguru Terai,Keito Shinohara,Melvin John F. Empizo,Nobuhiko Sarukura,Masaaki Kuzuhara 대한전자공학회 2024 Journal of semiconductor technology and science Vol.24 No.1
We have compared the electrical performance of a proposed normally-off GaN-based MIS-HEMTs employing ultrathin AlGaN barrier layer in the channel with those of conventional recessed-gate structure MIS-HEMTs. The proposed device exhibited much less density of interface states extracted from the measured capacitance-voltage characteristics, suggesting improved Al2O3/AlGaN interface. For corresponding three-terminal transistors, while the conventional reference device exhibited poor control of gate-to-source voltage on drain current with about 3 V hysteresis in the transfer curves, the proposed device showed well-behaved subthreshold characteristics with only 0.8 V hysteresis. Furthermore, the proposed device showed a much higher VTH of +5 V compared to +1 V of the conventional reference device.
Seismic performance of exterior R/C beam-column joint under varying axial force
Yanbing Hu,Masaki Maeda,Yusuke Suzuki,Kiwoong Jin 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.78 No.5
Previous studies have suggested the maximum experimental story shear force of beam-column joint frame does not reach its theoretical value due to beam-column joint failure when the column-to-beam moment capacity ratio was close to 1.0. It was also pointed out that under a certain amount of axial force, an axial collapse and a sudden decrease of lateral load-carrying capacity may occur at the joint. Although increasing joint transverse reinforcement could improve the lateral load-carrying capacity and axial load-carrying capacity of beam-column joint frame, the conditions considering varying axial force were still not well investigated. For this purpose, 7 full-scale specimens with no-axial force and 14 half-scale specimens with varying axial force are designed and subjected to static loading tests. Comparing the experimental results of the two types of specimens, it has indicated that introducing the varying axial force leads to a reduction of the required joint transverse reinforcement ratio which can avoid the beam-column joint failure. For specimens with varying axial force, to prevent beam-column joint failure and axial collapse, the lower limit of joint transverse reinforcement ratio is acquired when given a column-to-beam moment capacity ratio.
Polarization Reversals with 90o Domain Walls in Bi4Ti3O12
Makoto Iwata,Ikuo Suzuki,Maeda Masaki,Nohiko Yasuda,Rintaro Aoyagi,Yoshihiro Ishibashi 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
Polarization reversal processes with 90 domain walls under a low-frequency field of 25 mHz were investigated on the ab-plane in the ferroelectric Bi4Ti3O12 crystal by using a polarizing microscope. We found that there are three kinds of modes in the polarization reversal of the a-domain, that is, changes of the width in a-domains, annihilations of needle-like a-domains, and polarization reversals within the a-domain. We point out that the a-domain in the 90 domain wall structure plays an important role in the polarization reversal process under a field along the b direction.X%1
Makoto Iwata,Ryo Nagahashi,Masaki Maeda,Yoshihiro Ishibashi 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.9
The temperature and the DC biasing-field dependences of the dielectric permittivities along the [001]c, [011]c, and [111]c directions of the pseudocubic coordinates have been investigated in Pb(Zn1/3Nb2/3)O3-xPbTiO3 (x = 6%). The temperature-electric-field phase diagrams have been clarified in the field range below 8 kV/cm. The critical endpoint has been found at 1.3 kV/cm and 164 ◦ C for an electric field applied along the [001]c direction. The concentration dependences of the critical temperature and the transition temperature are discussed. The expected transition temperature T0(x) at which the second-order phase transition would occur is shown to be determined by the transition temperature TCT (x) and the critical temperature TCEP (x).
Makoto Iwata,Hidehiro Ohwa,Ikuo Suzuki,Maeda Masaki,Naohiko Yasuda,Yoshihiro Ishibashi 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Domain-wall structures on an etched surface of the PZN-20 %PT crystal were investigated by the scanning probe microscopy (SPM). It was shown that 90 and 180 domain-wall structures can be observed. The surface charge due to the spontaneous polarization was detected by the electrostatic force microscopy (EFM). It was found that there exist complex 180 domain-wall structures with typical size of 1 m order on the (001)-crystal surface of the PZN-20 %PT.
Makoto Iwata,Sadaharu Kato,Kazuki Tanaka,Masaki Maeda,Yoshihiro Ishibashi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.7
Dielectric constants as functions of the temperature and the DC biasing fields along the [011] and the [111] directions in cubic coordinates in 92%Pb(Zn<SUB>1/3</SUB>Nb<SUB>2/3</SUB>)O<SUB>3</SUB>-8%PbTiO<SUB>3</SUB> (PZN-8%PT) have been investigated. The temperature-field phase diagrams have been made in the field range below 15 kV/cm. We have found that the orthorhombic phase exists below the tetragonal phase as a ground state. The tetragonal phase disappears for external fields above about 10 kV/cm along the [011] and the [111] directions.