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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.
Toru Shigemitsu,Eito Nakaishi,Machi Maeda,Yusuke Araki 한국유체기계학회 2021 International journal of fluid machinery and syste Vol.14 No.1
There are many kinds of the fluid food transportation pumps depending on the characteristics of the fluid, i.e. a sanitary pump made from stainless steel, a screw pump and so on. A centrifugal pump was adopted as a fluid food pump in this research because it makes the stable continuous transportation of fluid food and the structure of the pump is simple compared to positive displacement pumps. The purpose of this research is to investigate the influence of the blade number on the pump performance and internal flow to enrich the pump design data for low viscous fluid food. The centrifugal pump with an open impeller was used and six impellers having the different blade number were prepared. Performance test using an experimental apparatus was conducted and the numerical analysis was also carried out. In the numerical analysis, the commercial software ANSYS-CFX16.2 was used. The head, shaft power and efficiency obtained by the numerical analysis, are almost the same with the experimental results. The head and shaft power increase with the increase of the blade number. The shear rate, which is concerned to fluid food quality, is high near the inlet region of the blade-to-blade passage for all types of blades. The shear rate of each type of the blade is discussed based on the numerical analysis results and relations between the blade number and shear rate are clarified.
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.
Ishimine Tomoyuki,Maeda Toru,Toyoda Haruhisa,Mimura Kouji,Nishioka Takao,Sugimoto Satoshi 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Recently, there has been a growing demand for soft magnetic materials with high conversion characteristics, due to the trend of electric devices to higher-frequency range. For ruduceing core loss in the high-frequency range, using finely grained and high-resistivity Fe-based alloy powder is most efficient methods. But, conventionally, there's been a compressibility problem for such powder. In this work, Fe-based alloy powder that offers both high resistivity and high compressibility was developed by studyuing composition of the powder, and reduction of core loss of P/M soft magnetic materials in the high frequency range was achieved.
A Study on Broadcasting / Communication System Using Highly Elliptical Orbit Satellites
Hamano, Nobuo,Yamada, Toru,Nakayama, Toshihiro,Maeda, Toshihide,Ikeda, Masahiko 통신위성우주산업연구회 2000 Joint Conference on Satellite Communications Vol.2000 No.-
There has been an increasing interest in world wide for the commercialization of broadcasting service using a type of satellites that are capable of providing high elevation angle characteristics over the service area. A typical example is a type of satellite in Highly Elliptical Orbit(HEO).One service provider a U.S. has already launched two of HEO satellites and they are being tested on orbit for the inauguration service in year 2001. We are also in the process of developing the system that uses HEO satellites system providing broadcasting service in Japan. In this paper an overall description of HEO satellite system is given then some of the issues and possible solutions are discussed. Finally the result of field measurement which we have carried out in Chicago using the above mentioned HEO satellite is given.
Kyoichi Ogawa,Tamon Kabata,Toru Maeda,Yoshitomo Kajino,Hiroyuki Tsuchiya 대한정형외과학회 2014 Clinics in Orthopedic Surgery Vol.6 No.2
Background: Several studies have shown that better placement of the acetabular cup and femoral stem can be achieved in total hip arthroplasty (THA) by using the computer navigation system rather than the free-hand alignment methods. However, there have been no comparisons of the relevant clinical advantages in using the computer navigation as opposed to the manual intraoperative measurement devices. The purpose of this study is to determine whether the use of computer navigation can improve postoperative leg length discrepancy (LLD) compared to the use of the measurement device. Methods: We performed a retrospective study comparing 30 computer-assisted THAs with 40 THAs performed using a simple manual measurement device. Results: The postoperative LLD was 3.0 mm (range, 0 to 8 mm) in the computer-assisted group and 2.9 mm (range, 0 to 10 mm) in the device group. Statistically significant difference was not seen between the two groups. Conclusions: The results showed good equalization of the leg lengths using both computed tomography-based navigation and the simple manual measurement device.
Jiyeon Park,최영주,Ryoko Mizushima,Toru Yoshikawa,Kanae Myoenzono,Kaname Tagawa,Masahiro Matsui,다나카기요지,Seiji Maeda 한국운동영양학회 2019 Physical Activity and Nutrition (Phys Act Nutr) Vol.23 No.3
[Purpose] Weight loss can reduce obesity-induced arterial stiffening that is attributed to decreased inflammation. Angiopoietin-like protein 2 (ANGPTL2) is a pro-inflammatory adipokine that is upregulated in obesity and is important in the progression of atherosclerosis and cardiovascular disease. The purpose of this study is to investigate the effects of dietary modification on circulating ANGPTL2 levels and arterial stiffness in overweight and obese men. [Methods] Twenty-two overweight and obese men (with mean age of 56 ± 2 years and body mass index of 28.6 ± 2.6 kg/m2) completed a 12-week dietary modification program. We measured the arterial compliance and β-stiffness index (as the indices of arterial stiffness) and serum ANGPTL2 levels before and after the program. [Results] After the 12-week dietary modification, body mass and daily energy intake were significantly reduced. Arterial compliance was significantly increased and β-stiffness index was significantly decreased after the 12-week dietary modification program. Serum ANGPTL2 levels were significantly decreased. Also, the changes in arterial compliance were negatively correlated with the changes in serum ANGPTL2 levels, whereas the changes in β-stiffness index were positively correlated with the changes in serum ANGPTL2 levels. [Conclusion] These results suggest that the decrease in circulating ANGPTL2 levels can be attributed to the dietary modification-induced reduction of arterial stiffness in overweight and obese men.
Hideyuki Tamai,Naoki Shingaki,Yoshiyuki Mori,Kosaku Moribata,Akira Kawashima,Yoshimasa Maeda,Toru Niwa,Hisanobu Deguchi,Izumi Inoue,Takao Maekita,Mikitaka Iguchi,Jun Kato,Masao Ichinose 거트앤리버 소화기연관학회협의회 2016 Gut and Liver Vol.10 No.4
Background/Aims: This study aimed to predict sustained viral response (SVR) to low-dose pegylated interferon (PEGIFN) plus ribavirin of elderly and/or cirrhotic patients with genotype 2 hepatitis C virus (HCV) using viral response within 2 weeks. Methods: Low-dose PEG-IFN-α-2b plus ribavirin was administered to 50 elderly and/or cirrhotic patients with genotype 2 HCV for 24 weeks. The dynamics of HCV RNA and HCV core antigen levels within 2 weeks were measured. Results: The patients’ median age was 66 years. There were 21 male and 29 female patients. The median baseline HCV RNA level was 5.7 log IU/mL. Rapid viral response was achieved in 17 patients (34%), SVR in 28 (56%), and two (4%) discontinued treatment. Univariate analysis of factors contributing to SVR showed significant differences for sex, baseline virus level, and response within 4 weeks. When 40 fmol/L was set as the cutoff value for the core antigen level at 1 week, the sensitivity, specificity, positive predictive value, negative predictive value, and accuracy for predicting SVR were 93%, 75%, 84%, 88%, and 85%, respectively. Conclusions: Low-dose PEG-IFN plus ribavirin was a safe and costeffective treatment for elderly and/or cirrhotic patients with genotype 2 HCV, and the viral response within 2 weeks was a useful predictor of SVR.