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Improvement in the Super Low Core-loss Soft Magnetic Materials
Maeda Toru,Sato Atsushi,Mochida Yasushi,Toyoda Haruhisa,Mimura Koji,Nishioka Takao 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
We reported a P/M soft magnetic material with core loss value of , which is lower than that of 0.35mm-thick laminated material, by using high purity gas-atomized iron powder. Lack of mechanical strength and high cost of powder production are significant issues for industrial use. In order to achieve both low core loss and high strength by using inexpencive powder, the improvement of powder shape and surface morphology and binder strength was conducted. As the result, the material based on water-atomized powder with 80 MPa of TRS and 108 W/kg of core loss (W10/1k) was achieved.
Tatsuya Sato,Taro Bannai,Toru Miyake,Keita Murakami,Risa Maekawa,Yasushi Shiio 대한노인병학회 2021 Annals of geriatric medicine and research Vol.25 No.1
Diffuse idiopathic skeletal hyperostosis (DISH) is a non-inflammatory process characterized by hyperostosis at tendon insertions and around joint capsules and ossification of the anterior longitudinal ligament of the spine. The flexibility of the spinal column is reduced in DISH and affects the movement of the thorax, leading to restrictive ventilatory function. In this report, we describe the first two cases of severe type 2 (hypercapnic) respiratory failure associated with DISH. Two older men presented with histories of shortness of breath. Radiography of the spine revealed DISH with coexisting ankylosis of the costovertebral joints. The patients’ thoracic motion was severely restricted, reducing the mechanism of lung expansion to diaphragm contraction only. Both patients required non-invasive positive-pressure ventilation therapy to cope with their conditions. Our report sheds light on the risk of potentially life-threatening respiratory manifestations of DISH among older adults.
Formation Control for Multi–Vehicle System using Adaptive Control Method
Kazuya Sato,Toru Saito,Nobuhisa Maeda 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, an adaptive control method for formation control problem is considered. We assume that there existan uncertainty in the information exchange between anagent and all of its neighbors on the network. We regard that the uncertainty in the information exchange can be described by the perturbation of the elements of adjacent matrix. Our proposed method can estimate the perturbation of the elements in the notion of adaptive control strategy. Numerical simulation results are given to illustrate the effectiveness of our proposed method.
Numerical Prediction of Effect of Seawater-Quality Enhancer Installed in Isahaya Bay
Saito, Shu,Sato, Toru,Kitazawa, Daisuke The Korean Association of Ocean Science and Techno 2006 Journal of Ocean Science and Technology Vol.3 No.1
Since the construction of Isahaya Dyke, it is said that the tidal current in Ariake Bay has changed. The change may bring on the environmental deterioration in Ariake Bay. Especially in Isahaya Bay and the offshore of Oura, the emergence of oxygen-deficient water has been prominent. In this study, firstly, we simulated the emergence of oxygen-deficient water by incorporating an ecosystem model into an ocean current model to elucidate the mechanism of the oxygen-deficient water both from physical and biological viewpoints. Next, we proposed a local engineering solution, a seawater-quality enhancer, and simulated numerically the diffusion of nutrient-rich water emitted by the apparatus and its effects on the ecosystems, particularly, on the oxygen-deficient water. The apparatus spreads horizontally the intermediate-density mixture of surface and deep waters. The numerical model considered 8 principal rivers because the nutrient-rich density currents of fresh water largely affect the currents and the ecosystems in Ariake Bay. It was shown that 16 % of the oxygen-deficient water in Isahaya Inlet was reduced by the apparatus, which emits 100-million-ton water per day, at 8 weeks after the start of operation. This may imply the possibility of improvement of water quality by this engineering countermeasure.
Design of a Performance-driven One-parameter Tuning Controller
Shin Wakitani,Toru Yamamoto,Takao Sato 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.6
The properties of most real systems vary every moment. For such systems, performance-adaptive control systems, which assess current control performance and tune their controller based on the assessment, are effective. This paper proposes a one-parameter tuning method as one of design methods of the performance-adaptive control systems. When the current control performance is diagnosed as being poor, the conventional performance-adaptive control systems redesign their controllers using the results of system re-identification. However, the system has a risk that the redesigned controller may cause further deterioration of the control performance depending on the identification accuracy of the estimated parameters. In the proposed method, the controller has a unique userspecified adjustable parameter. The controller can improve the control performance by adjusting only the parameter. However, only if the desired control performance cannot be maintained by adjusting the parameter because of drastic changes in the controlled object, the control system redesigns the controller using the estimated system parameters. Thanks to this strategy, the number of controller redesigns using the estimated system parameters is decreased when compared to the conventional performance-adaptive control system. It can also reduce the risk of further deterioration of the control performance because of the controller redesign. The effectiveness of the proposed method is evaluated by simulations and application to a weigh feeder that is one of food process systems.
Numerical and Experimental Simulation on Bubble Plume Behaviour in Stratified Flow
Ishikawa, Atsuhiro,Sato, Toru,Nakashiki, Norikazu The Korean Association of Ocean Science and Techno 2005 Journal of Ocean Science and Technology Vol.2 No.1
We developed a 3D Eulerian-Lagrangian two-phase CFD code, which can cope with distributions of bubble radius. The simulation results were compared moderately well with those of bubbling experiments conducted in a channel for circulating stratified water. It was elucidated how the difference of the simulation conditions effects the behaviour of bubbles, dye distribution, and the intrusion of dissolved $CO_2$ into the stratification. From the results, suggested is the possibility of the code to apply to the behaviour of $CO_2$ droplets released in the deep ocean for sequestering the greenhouse gas.
Tomonori Tetsunaga,Toru Sato,Naofumi Shiota,Tomoko Tetsunaga,Masahiro Yoshida,Yoshiki Okazaki,Kazuki Yamada 대한정형외과학회 2015 Clinics in Orthopedic Surgery Vol.7 No.2
Postoperative pain relief can be achieved with various modalities. However, there are only few reports that have analyzed postoperative analgesic techniques in total hip arthroplasty patients. The aim of this retrospective study was to compare the postoperative outcomes of three different analgesic techniques after total hip arthroplasty. Methods: We retrospectively reviewed the influence of three analgesic techniques on postoperative rehabilitation after total hip arthroplasty in 90 patients divided into three groups (n = 30 patients per group). Postoperative analgesia consisted of continuous epidural analgesia (Epi group), patient-controlled analgesia with morphine (PCA group), or a continuous femoral nerve block (CFNB group). We measured the following parameters relating to postoperative outcome: visual analog scale scores, the use of supplemental analgesia, side effects, length of the hospital stay, plasma D-dimer levels, and the Harris hip score. Results: Each group had low pain scores with no significant differences between the groups. The PCA group had a lower frequency of supplemental analgesia use compared to the Epi and CFNB groups. Side effects (nausea/vomiting, inappetence) and day 7 D-dimer levels were significantly lower in the CFNB group (p < 0.05). There were no significant differences between the groups in terms of the length of the hospital stay or the Harris hip score. Conclusions: Although there were no clinically significant differences in outcomes between the three groups, the CFNB provided good pain relief which was equal to that of the other analgesics with fewer side effects and lower D-dimer levels in hospitalized patients following total hip arthroplasty.