http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Hamasaki Takahiko,Nakamae Toshio,Kamei Naosuke,Fujiwara Yasushi,Rhee John M.,Tanaka Nobuhiro,Fujimoto Yoshinori,Adachi Nobuo,Shimose Shoji 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.5
Study Design: Retrospective cohort study.Purpose: The present study aimed to examine the characteristics of physical signs in elderly patients with cervical myelopathy (CM) and to compare the findings in three different age groups.Overview of Literature: As the global population ages, the incidence of CM in elderly patients is increasing.Methods: We evaluated 100 consecutive surgical patients with CM and divided them into the following groups: 80s (34 patients; mean age, 83.9 years), 70s (33 patients; mean age, 73.9 years), and 69 or younger (33 patients; mean age, 60.9 years). The clinical symptoms and physical signs were evaluated and recorded.Results: Although the recovery rate decreased with increasing age, all groups demonstrated a significant improvement in clinical symptoms relative to preoperative values. The Hoffman sign and hyperreflexia of the triceps tendon were, respectively, present in 82% and 88% of patients in the 80s group, 74% and 64% of those in the 70s group, and 69% and 82% of those in the 69 or younger group, with no significant difference among the groups. In contrast, the rates of hyperreflexia of the patellar and Achilles tendons were, respectively, 59% and 32% in the 80s group, 85% and 48% in the 70s group, and 91% and 70% in the 69 or younger group, with significant differences.Conclusions: The positivity rate of the lower extremity hyperreflexia decreased significantly with increasing age in patients with CM. The absence of hyperreflexia, particularly lower extremity, is not uncommon in elderly patients with suspected CM.
Hamasaki, Shin-Ichi,Okamura, Kazuki,Tsuji, Mineo Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.2
The Modular Multilevel Converter (MMC) with full bridge cells is available for utility interactive inverter in high voltage line. When it is interconnected with power line, it is possible to control the active power flow in order to supply or charge the power in the line. This research applied the MMC to grid connection system of distributed generator and a power flow control for the MMC is investigated. Theory of power flow between the MMC and the power line is described and control method of power flow and capacitor voltages on arm cells for the MMC are proposed. And effectiveness of the proposed control method is presented by simulation.
Improvement of Responsivity of Unified Power Flow Controller in Digital Control System
Hamasaki, Shin-ichi,Miyazaki, Shinya,Takaki, Tsuyoshi,Tsuji, Mineo Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.3
The Unified Power Flow Controller (UPFC) can flexibly manage power flow and maintain line voltage. The UPFC consists of two inverters in parallel side and series side. In parallel side, the reactive power can be compensated to improve the power factor. In series side, the voltage drop can be compensated to maintain proper line voltage. It is necessary for the operation in both sides to output the current and the voltage quickly and accurately. As the method for the UPFC control, the deadbeat control with state observer is applied. The deadbeat control is able to realize a quick response of the current and voltage control for only a sampling period compared with the general PI control. A principle and simulation results are presented in this paper.
Tatsuichi Hamasaki,Kazuko Zenmyo,Hidenori Kubo 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The mixed transition metal dichloride dihydrates A1−xBxCl2·2H2O (A, B=Co, Mn, Ni) havebeen prepared in order to understand the specificity of the Mn spins in the mixtures. The temperaturedependences of the spin lattice relaxation times T1 of proton nuclear magnetic resonance(NMR) on these mixed crystals have been measured. In Ni1−xBxCl2·2H2O (B=Co, Mn), Mn substitutionincreased the relaxation rates 1/T1 more than Co substitution, even when the amounts ofsubstitution were almost the same. In Co1−xBxCl2·2H2O (B=Mn, Ni), Mn has a significant impacton the relaxation rates in comparison with Ni. In Mn1−xBxCl2·2H2O (B=Ni, Co), the relaxationrates are much increased by a slight substitution of Co and exhibit a minimum in the temperaturerange of observation. This appearance of a minimum in the relaxation rates at low temperatures isbelieved to reflect an instability due to the occurrence of a reentrant spin-glass transition. A similartrend is seen at low temperatures in the case of Ni substitution, too. A Co1−xFexCl2·2H2O (x =0.1) sample has been prepared, too. In this sample, a minimum of the relaxation rate is seen inthe temperature range of observation. This may reflect an instability due to the occurrence of anoblique antiferromagnetic transition.
Activated Protein C Anticoagulant System Dysfunction and Thrombophilia in Asia
Naotaka Hamasaki,Hiroyuki Kuma,Hiroko Tsuda 대한진단검사의학회 2013 Annals of Laboratory Medicine Vol.33 No.1
Thrombophilia that is common among Caucasians is caused by genetic polymorphisms of coagulation factor V Leiden (R506Q) and prothrombin G20210A. Unlike that in Caucasians, thrombophilia that is common in the Japanese and Chinese involve dysfunction of the activated protein C (APC) anticoagulant system caused by abnormal protein S and protein C molecules. Approximately 50% of Japanese and Chinese individuals who develop venous thrombosis have reduced activities of protein S. The abnormal sites causing the protein S molecule abnormalities are distributed throughout the protein S gene, PROS1. One of the most common abnormalities is protein S Tokushima (K155E), which accounts for about 30% of the protein S molecule abnormalities in the Japanese. Whether APC dysfunction occurs in other Asian countries is an important aspect of mapping thrombophilia among Asians. International surveys using an accurate assay system are needed to determine this.
Three-dimensional simplified slope stability analysis by hybrid-type penalty method
Yamaguchi, Kiyomichi,Takeuchi, Norio,Hamasaki, Eisaku Techno-Press 2018 Geomechanics & engineering Vol.15 No.4
In this study, we propose a three-dimensional simplified slope stability analysis using a hybrid-type penalty method (HPM). In this method, a solid element obtained by the HPM is applied to a column that divides the slope into a lattice. Therefore, it can obtain a safety factor in the same way as simplified methods on the slip surface. Furthermore, it can obtain results (displacement and strain) that cannot be obtained by conventional limit equilibrium methods such as the Hovland method. The continuity condition of displacement between adjacent columns and between elements for each depth is considered to incorporate a penalty function and the relative displacement. For a slip surface between the bottom surface and the boundary condition to express the slip of slope, we introduce a penalty function based on the Mohr-Coulomb failure criterion. To compute the state of the slip surface, an r-min method is used in the load incremental method. Using the result of the simple three-dimensional slope stability analysis, we obtain a safety factor that is the same as the conventional method. Furthermore, the movement of the slope was calculated quantitatively and qualitatively because the displacement and strain of each element are obtained.
Stability Comparison of New Simplified Speed Sensorless Vector Control Systems for Induction Motors
Mangindaan, Glanny M.Ch.,Tsuji, Mineo,Hamasaki, Sin-Ichi Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.2
This paper discusses stability of new simplified sensorless vector control systems of induction motors (IM). The simplified sensorless systems estimate the flux angle by using the output voltage of d-axis PI current controller to achieve the q-axis flux zero. Two simplified sensorless systems are studied. The difference of two systems is the presence or absence of a q-axis PI current controller. The systems stability is compared by deriving linear state equations and showing root loci and unstable regions. Furthermore, transient responses and experiment results make clear the stability of the proposed system.