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Search Results: 1 - 10 of 325383 matches for " Hidaka S "
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Selection of Suitable Safety Activities and Experience of Safety Condition Establishment  [PDF]
Akihiko Hidaka, Atsumi Miyake
Open Journal of Safety Science and Technology (OJSST) , 2015, DOI: 10.4236/ojsst.2015.51001
Abstract: In recent years, Japanese manufacturing firms have been building factories in the developing countries of Southeast Asia and employing local personnel. Using local employees who were basically people of the agricultural countries implies difficulties in both technical and safety terms. This study examines how quickly and effectively the companies going into the developing countries establish a standard of safety. The authors focus on Vietnam and Thailand as representative countries. To their surprise, the authors find that all 27 companies that answered their questionnaire had introduced “5S activities” at startup and were continuing to use them. In addition, nearly 80% of the companies began using “KY activities”, “Safety proposal activities”, and “Examinations of accidents” soon after startup. One of the authors Akihiko Hidaka, when serving as the president of the Thai subsidiary of a Japanese chemical company, developed safety activities to reduce work-related accidents. And he knew that the kinds of safety activities he developed were same as above 4 activities. So he evaluated these activities and judged them to be effective. The authors conclude that “5S activities”, “KY activities”, “Safety proposal activities”, and “Examinations of accidents” were the activities best able to improve safety effectively and quickly in developing countries. The authors describe the safety activities carried out at the Thai company and then describe the most important features of the methods used to establish safety conditions at the firm.
Weak localization and percolation effects in annealed In2O3-ZnO thin films
B. Shinozaki,S. Ezaki,K. Hidaka,K. Makise
AIP Advances , 2011, DOI: 10.1063/1.3635375
Abstract: We have investigated the temperature T and magnetic field H dependences of the sheet resistance R□ of thin (In2O3)0.975-(ZnO)0.025 films with different resistivities and carrier densities prepared by postannealing in air at various annealing temperatures Ta. Regarding the magnetoconductance Δσ(H) ≡ 1/R□(H) 1/R□(0) of films with large values of sheet resistance R□, agreement between weak localization theory and the data cannot be obtained for any value of the localization length L in (T) = D τ in (T) , where D and τin are the diffusion constant and inelastic scattering time, respectively. Taking account of the inhomogeneous morphology confirmed by Scanning Electron Microscopy (SEM) observation, we introduced the effective sheet resistance R□eff given by R□eff = α × R□meas., where the strength of reduction factor α is less than unit, α 1. Using a suitable value of α(Ta), we successfully fitted the theory to data for Δσeff(H, T), regarding Lin2(T) as a fitting parameter in the region 2.0 K T 50 K. It was confirmed that the rate 1/τin(T) is given by the sum of the electron-electron and electron-phonon inelastic scattering rates.
Impact of CP phases on stop and sbottom searches
A. Bartl,S. Hesselbach,K. Hidaka,T. Kernreiter,W. Porod
Physics , 2003, DOI: 10.1016/j.physletb.2003.08.047
Abstract: We study the decays of top squarks (stop_{1,2}) and bottom squarks (sbottom_{1,2}) in the Minimal Supersymmetric Standard Model (MSSM) with complex parameters A_t, A_b, mu and M_1. We show that including the corresponding phases substantially affects the branching ratios of stop_{1,2} and sbottom_{1,2} decays in a large domain of the MSSM parameter space. We find that the branching ratios can easily change by a factor of 2 and more when varying the phases. This could have an important impact on the search for stop_{1,2} and sbottom_{1,2} and the determination of the MSSM parameters at future colliders.
Top Squarks and Bottom Squarks in the MSSM with Complex Parameters
A. Bartl,S. Hesselbach,K. Hidaka,T. Kernreiter,W. Porod
Physics , 2003, DOI: 10.1103/PhysRevD.70.035003
Abstract: We present a phenomenological study of top squarks (~t_1,2) and bottom squarks (~b_1,2) in the Minimal Supersymmetric Standard Model (MSSM) with complex parameters A_t, A_b, \mu and M_1. In particular we focus on the CP phase dependence of the branching ratios of (~t_1,2) and (~b_1,2) decays. We give the formulae of the two-body decay widths and present numerical results. We find that the effect of the phases on the (~t_1,2) and (~b_1,2) decays can be quite significant in a large region of the MSSM parameter space. This could have important implications for (~t_1,2) and (~b_1,2) searches and the MSSM parameter determination in future collider experiments. We have also estimated the accuracy expected in the determination of the parameters of ~t_i and ~b_i by a global fit of the measured masses, decay branching ratios and production cross sections at e^+ e^- linear colliders with polarized beams. Analysing two scenarios, we find that the fundamental parameters apart from A_t and A_b can be determined with errors of 1% to 2%, assuming an integrated luminosity of 1 ab^-1 and a sufficiently large c.m.s. energy to produce also the heavier ~t_2 and ~b_2 states. The parameter A_t can be determined with an error of 2 - 3%, whereas the error on A_b is likely to be of the order of 50%.
Improved SUSY QCD corrections to Higgs boson decays into quarks and squarks
H. Eberl,K. Hidaka,S. Kraml,W. Majerotto,Y. Yamada
Physics , 1999, DOI: 10.1103/PhysRevD.62.055006
Abstract: We improve the calculation of the supersymmetric $O(\alpha_s)$ QCD corrections to the decays of Higgs bosons into quarks and squarks in the Minimal Supersymmetric Standard Model. In the on-shell renormalization scheme these corrections can be very large, which makes the perturbative expansion unreliable. This is especially serious for decays into bottom quarks and squarks for large $\tan\beta$. Their corrected widths can even become negative. We show that this problem can be solved by a careful choice of the tree-level Higgs boson couplings to quarks and squarks, in terms of the QCD and SUSY QCD running quark masses, running trilinear couplings $A_q$, and on-shell left-right mixing angles of squarks. We also present numerical results for the corrected partial decay widths for the large $\tan\beta$ case.
Improved SUSY QCD corrections to Higgs boson decays into quarks and squarks
Y. Yamada,H. Eberl,K. Hidaka,S. Kraml,W. Majerotto
Physics , 2000,
Abstract: The O(alpha_s) SUSY QCD corrections to the decays of the MSSM Higgs bosons into bottom quarks and squarks can be very large for large tan beta in the on--shell renormalization scheme. We improve the calculation by a careful choice of the tree-level Higgs boson couplings in terms of running parameters of quarks and squarks.
Impact of slepton generation mixing on the search for sneutrinos
Hidaka, K.
High Energy Physics - Phenomenology , 2008,
Abstract: We perform a systematic study of sneutrino production and decays in the Minimal Supersymmetric Standard Model (MSSM) with lepton flavour violation (LFV). We study bosonic decays of sneutrinos as well as fermionic ones. We show that the effect of slepton generation mixing on the sneutrino production and decays can be quite large in a significant part of the MSSM parameter space despite the very strong experimental limits on LFV processes. This could have an important impact on the search for sneutrinos and the determination of the MSSM parameters at LHC and future colliders, such as ILC, CLIC and muon collider.
Impact of slepton generation mixing on the search for sneutrinos - Lepton flavour violation in sneutrino production and decays in the general MSSM
Hidaka, K.
High Energy Physics - Phenomenology , 2007,
Abstract: We perform a systematic study of sneutrino production and decays in the Minimal Supersymmetric Standard Model (MSSM) with slepton generation mixing. We study bosonic decays like sneutrino \to slepton^- + W^+/H^+ as well as fermionic ones. We show that the effect of slepton generation mixing on the sneutrino production and decays can be quite large in a significant part of the MSSM parameter space despite the very strong experimental limits on lepton flavour violating processes. This could have an important impact on the search for sneutrinos and the determination of the MSSM parameters at future colliders, such as LHC, ILC, CLIC and muon collider.
A Computational Model Associating Learning Process, Word Attributes, and Age of Acquisition
Shohei Hidaka
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0076242
Abstract: We propose a new model-based approach linking word learning to the age of acquisition (AoA) of words; a new computational tool for understanding the relationships among word learning processes, psychological attributes, and word AoAs as measures of vocabulary growth. The computational model developed describes the distinct statistical relationships between three theoretical factors underpinning word learning and AoA distributions. Simply put, this model formulates how different learning processes, characterized by change in learning rate over time and/or by the number of exposures required to acquire a word, likely result in different AoA distributions depending on word type. We tested the model in three respects. The first analysis showed that the proposed model accounts for empirical AoA distributions better than a standard alternative. The second analysis demonstrated that the estimated learning parameters well predicted the psychological attributes, such as frequency and imageability, of words. The third analysis illustrated that the developmental trend predicted by our estimated learning parameters was consistent with relevant findings in the developmental literature on word learning in children. We further discuss the theoretical implications of our model-based approach.
Model study of the sign problem in a mean-field approximation
Yoshimasa Hidaka
Physics , 2007,
Abstract: We study the sign problem of the fermion determinant at nonzero baryon chemical potential. For this purpose we apply a simple model derived from Quantum Chromodynamics, in the limit of large chemical potential and mass. For SU(2) color, there is no sign problem and the mean-field approximation is similar to data from the lattice. For SU(3) color the sign problem is unavoidable, even in a mean-field approximation. We apply a phase-reweighting method, combined with the mean-field approximation, to estimate thermodynamic quantities. We also investigate the mean-field free energy using a saddle-point approximation.
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