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An estimation of static aerodynamic forces of box girders using computational fluid dynamics
Watanabe, Shigeru,Inoue, Hiroo,Fumoto, Koichiro Techno-Press 2004 Wind and Structures, An International Journal (WAS Vol.7 No.1
This study has focused on aerodynamics for a wind-resistance design about the single and tandem box girder sections to realize a super-long span bridge in the near future. Three-dimensional static analysis of flows around the fundamental single and tandem box girder sections with fairing is carried out by means of the IBTD/FS finite element technique with LES turbulence model. As the results of the analysis, computations have verified aerodynamic characteristics of both sections by the histories of aerodynamic forces, the separation and reattachment flow patterns and the surface pressure distributions. The relationship between the section shapes and the aerodynamic characteristics is also investigated in both sections. And the mechanism about the generation of fluctuating aerodynamic forces is discussed.
Properties of Soft Magnetic Composite with Evaporated MgO Insulation Coating for Low Iron Loss
Uozumi Gakuji,Watanabe Muneaki,Nakayama Rryoji,Igarashi Kazunori,Morimoto Koichiro 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Innovative SMC with low iron loss was made from iron powders with evaporated MgO insulation coating. The coating had greater heat-resistance than conventional phosphatic insulation coating, which enabled stress relieving annealing at higher temperature. Magnetic properties of toroidal samples (OD35mm,ID25mm, t5) were examined. The iron loss at 50Hz for Bm = 1.5T was lower 50% of conventional SMC and was almost the same with silicon iron laminations(t0.35). It became clear that MgO insulation coating has enough heat resistance and adhesiveness to powdersurface to obtain innovative SMC with low iron loss.
A search for Sustainable Competitive Advantage Factors in a Hyper-Competition Scenario
Myungr-Rae CHO,Koichiro WATANABE 한국유통과학회 2018 KODISA ICBE (International Conference on Business Vol.2018 No.-
In a highly competitive hyper-competition scenario, it is challenging to gain a sustainable competitive advantage. It is said that it is important to continuously create a temporary competitive advantage by taking an aggressive competitive action after losing a competitive advantage. This research aims to clarify the factors of how a company can sustain high profits in a hyper-competitive situation. While the current research on competitive strategy theory is based on the premise of the competitive advantage possessed by one company s products and services, this research adopted a multi-company network approach based on the SCP theory of economics. The case of Hill’s Japan was analyzed using the value network concept, and the research method was based on primary data collected through interviews. The analysis found that the value network established by Hill’s Japan was linked by strong relationships of trust among its members and that the network made it difficult for competitors to enter the market at the same time as Hill’s Japan, thereby acting as a barrier to entry. This study presents the concept of the trust-type value network as a factor of sustainable competition in the hyper-competition age.
Wang Jili,Ushirozako Hiroki,Yamato Yu,Ide Koichiro,Hasegawa Tomohiko,Yoshida Go,Banno Tomohiro,Oe Shin,Arima Hideyuki,Mihara Yuki,Watanabe Yuh,Nakai Keiichi,Kurosu Kenta,Hoshino Hironobu,Matsuyama Yuk 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.2
Study Design: A retrospective cohort study.Purpose: Our aim is to investigate the relationship between degenerative lumbar scoliosis (DLS), and whole-body alignment, including spinopelvic and lower extremity alignments. Overview of Literature: DLS is a deformity commonly associated with aging. However, the correlation between whole-body alignment and DLS remains controversial.Methods: Adult volunteers aged over 50 years were included in the study after participating in the screening program. Characteristic data and standing radiographic parameters were assessed. A propensity score model was established with adjustments for age and sex after a preliminary analysis, and cases were divided into DLS (Cobb angle >10°) and non-DLS (Cobb angle ≤10°) groups.Results: There were significant differences in age, sex, C2 sagittal vertical axis (C2-SVA), C7-SVA, T1 pelvic angle (TPA), lumbar lordosis (LL), pelvic incidence (PI), pelvic tilt (PT), PI minus LL (PI–LL), knee angle, ankle angle, pelvic shift, C7-center sacral vertical line, L4 tilt, femur-tibia angle, and hip-knee-ankle angle (all p <0.05) using a preliminary analysis of 261 cases (75 DLS and 186 non-DLS). A one-to-one propensity score-matched analysis was used after 70 pairs of cases were selected. There were no significant differences in the characteristic data for lower extremity parameters. There were still significantly higher values of C2-SVA, TPA, PI, PT, and PI–LL in DLS group than in non-DLS group (all p <0.05).Conclusions: This study showed an important relationship between DLS and sagittal spinal deformity. However, DLS was not associated with the sagittal and coronal lower extremity alignments.