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Ozaki Yukiko,Alessandri Elena,Uenosono Satoshi,Takamiya Tsuguyuki,Shigeru Takano 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
We investigated the mechanism how the high green density can be provided during die lubricated warm compaction (WD). We observed and analyzed the densification processes of iron powders including different contents of an inner lubricant, and measured the lateral pressure at the die wall during WD in comparison with conventional compaction and warm compaction. As a result, the high density in WD was due to not only the particles-deformation enhanced by warming powders but also the particles-rearrangement promoted by reducing an amount of the inner lubricant rather than the die lubrication.
Low-speed Wake Analysis of Supersonic Biplane
Shuichi Ozaki,Masahito Yonezawa,Naoshi Kuratani,Toshihiro Ogawa,Shigeru Obayashi,Takashi Matsuno,Hiromitsu Kawazoe 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-
This study was focused on the profile drag estimation from the wake survey of the now field with the wind tunnel testing. The experimental investigation was conducted with the low turbulence wind tunnel to estimate the profile drag coefficient of the supersonic biplane from the pressure loss in the wake of the model. The surveys were conducted behind the supersonic biplane model whose airfoil could realize the shock wave cancellation at design Mach number 1.7. The two-dimensional CFD simulations were also conducted to compare with the experimental results. The reduction of the test data by Jones equation gave the profile drag coefficients agreed with those obtained from the CFD simulations at zero lift conditions. However, at lifting conditions. the experimental results and the CFD results didn't agree. In this study, the profile drag characteristics of the supersonic biplane were discussed based on these results.
Takashi Ozaki,Atsuhito Toyomaki,Naoki Hashimoto,Ichiro Kusumi 대한정신약물학회 2021 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.19 No.2
Objective: The effect of antipsychotic drugs on quantitative electroencephalography (EEG) has been mainly examined by the administration of a single test dose or among patients using combinations of other psychotropic drugs. We therefore investigated the effects of strict monotherapy with antipsychotic drugs on quantitative EEG among schizophrenia patients. Methods: Data from 2,364 medical reports with EEG results from psychiatric patients admitted to the Hokkaido University Hospital were used. We extracted EEG records of patients who were diagnosed with schizophrenia spectrum disorders and who were either undergoing strict antipsychotic monotherapy or were completely free of psychotropic drugs. The spectral power was compared between drug-free patients and patients using antipsychotic drugs. We also performed multiple regression analysis to evaluate the relationship between spectral power and the chlorpromazine equivalent daily dose of antipsychotics in all the patients. Results: We included 31 monotherapy and 20 drug-free patients. Compared with drug-free patients, patients receiving antipsychotic drugs demonstrated significant increases in theta, alpha and beta power. When patients taking different types of antipsychotics were compared with drug-free patients, we found no significant change in any spectrum power for the aripiprazole or blonanserin groups. Patients taking risperidone demonstrated significant increases in alpha and beta power. Patients taking clozapine and olanzapine demonstrated significant slow wave increases. Multiple regression analysis revealed that the chlorpromazine equivalent dose was positively associated with theta power. Conclusion: Use of any antipsychotic drug by patients was associated with a dose-dependent increase in theta power. However, each type of antipsychotic demonstrated different spectral power changes.
Nonlinear Receding Horizon Control of a Tandem Cold Millin Acceleration and Deceleration Conditions
Kohei Ozaki,Toshiyuki Ohtsuka,Kenji Fujimoto,Akira Kitamura,Makishi Nakayama 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
For precise control of tension and thickness in a tandem cold millinac celeration and deceleration conditions, we employ an onlin ear model in cluding the rolling speed as a time-varying parameter. It is demon strated in simulation results that nonlinear receding horizon control by realtime optimization achieves satisfactory performance for the nonlinear model.