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Ductility of open piled wharves under reversed cyclic loads
Yokota, Hiroshi,El-Bakry, Hazem M.F. Techno-Press 2001 Structural Engineering and Mechanics, An Int'l Jou Vol.12 No.6
Ductility of open piled wharves under reversed cyclic loads has been investigated. Experimental testing of five wharf models having a scale of about 1:4 was conducted under the application of horizontal reversed cyclic loading. The experiments were designed to focus on the horizontal ultimate load, ductility and failure mode of the considered wharf models. Nonlinear numerical analyses using the finite element method were also performed on numerical models representing the experimentally tested wharves. The results of the experimental tests showed that open piled wharves possessed favourable ductile behaviour and that their load bearing capacity did not depreciate until a ductility factor of 3 to 4 was reached. The numerical analysis showed that the relative rotation that took place at the joints between the steel piles and the R.C. beam was responsible for a considerable portion of the total horizontal deformation of the wharves. Therefore, it was concluded that introducing the joint stiffness in calculating the deformations of open piled wharves was important to achieve reasonable accuracy.
Studyon Human body Motion Interface
Sho Yokota,Hiroshi Hashimoto,Yasuhiro Ohyama,Jin-Hua SHE,Daisuke Chugo,Hisato Kobayashi,Pierre Blazevic 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The joystick is the operation interface of electric wheelchair. The user needs to operate it in accordance with machine’s operational procedure specifications. Therefore the joystick is convenience operation system for the system side rather than the user side We focus on the body motions which humans have, and tryto realize a new type of interface which replaces conventional joystick. There is a body motion which comes from in stinctive adjustment functions to control changes of body shape caused by voluntary actions. We use this kind of motion as an interface and call it HBMI(Human Body Motion Inerface). In this paper, we set a prototype based on the experiment for deriving a suitable measurement to detect human body motion. The evaluation of HBMI by using SD method is also presented.
Hand Pose Estimation from Camera Images of Ring-shaped Markers
Akinori Sasaki,Sho Yokota,Yasuhiro Ohyama,Hiroshi Hashimoto 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper describes hand pose estimation from camera images of ring-shaped markers. The ring-shaped markers are employed to more simplify the measurement than measurement with conventional reflective markers. Using results of the pose estimation of the ring-shaped markers, the entire finger poseis estimated with an atomical constraints on finger kinematics.
Low Complexity Iterative Precoder for Downlink MU-MIMO Systems
Naotaka Yoshida,Yuji Yokota,Yuhei Nagao,Hiroshi Ochi 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
Block diagonalization (BD) precoder is used for Multi-User Multiple Input Multiple Output (MU-MIMO) IEEE 802.11ac Wireless LAN. To improve the latency of the MU-MIMO systems, the BD precoder using iterative calculation has been proposed. We call this method Iterative BD (IBD). IBD can start the MU-Precoder weight matrix calculation even before all user’s channel state information (CSI) are received. However IBD has a higher complexity compared to non-iterative BD because of the overhead of iterative calculation. In this paper, we reduce the complexity due to the iteration process by computing the null space needed in the IBD method together with the channel matrix decompression which is applied by CSI feedback process based on IEEE802.11ac. We show that our method can significantly reduce the complexity of IBD.
Study for grain-filling of rice using 13C labeling flow-metabolome analysis
Okamura Masaki,Hirai Masami Yokota,Sawada Yuji,Okamoto Mami,Arai-Sanoh Yumiko,Yoshida Hiroe,Mukouyama Takehiro,Adachi Shunsuke,Fushimi Erina,Yabe Shiori,Nakagawa Hiroshi,Kobayashi Nobuya,Kondo Motohik 한국작물학회 2017 한국작물학회 학술발표대회 논문집 Vol.2017 No.-
Jian-Guo Dai,Kent A. Harries,Hiroshi Yokota 국제구조공학회 2008 Steel and Composite Structures, An International J Vol.8 No.6
Yielding of the internal steel reinforcement is an important mechanism that influences the Intermediate Crack-induced debonding (IC debonding) behavior in FRP-strengthened RC members since the FRP is required to carry additional forces beyond the condition of steel yielding. However, rational design practice dictates an appropriate limit state is defined when steel yielding is assured prior to FRP debonding. This paper proposes a criterion which correlates the occurrence of IC debonding to the formulation of a critical steel yielding length. Once this length is exceeded the average bond stress in the FRP/concrete interface exceeds its threshold value, which proves to correlate with the average bond resistance in an FRP/concrete joint under simple shear loading. This proposed IC debonding concept is based on traditional sections analysis which is conventionally applied in design practice. Hence complex bond stress-slip analyses are avoided. Furthermore, the proposed model incorporates not only the bond properties of FRP/concrete interface but also the beam geometry, and properties of steel and FRP reinforcement in the analysis of IC debonding strength. Based upon a solid database, the validity of the proposed simple IC debonding criterion is demonstrated.