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Pha N. Pham,Kazuhisa Ito 유공압건설기계학회 2015 유공압건설기계학회 학술대회논문집 Vol.2015 No.10
Recently, the application of water hydraulics has been paid attention because of its inherent merits such as environmental friendliness, clean, high safety against fire hazard and easy availability. However, water hydraulic devices themselves have lower energy efficiency than in oil systems and this prevents from widening its application. The original method for reducing energy consumption and therefore raising the energy efficiency is to make the supply pressure to change depending on the demand. On the other hand, the variable supply pressure affects the control performance besides larger friction force and considerable leakage flow. Thus, the requirement for reducing the effect of the variable parameters in water hydraulic systems becomes very important for highly precise application. In this paper, the simple adaptive control (SAC) algorithm applied to a water hydraulic servo motor system is introduced for compensating the effects of the fast changing of supply pressure that affects strongly to control response. SAC and conventional PID control performances are compared together in case of using constant supply pressure and variable supply pressure. The simulation results show that for constant supply pressure; the responses in SAC and PID are almost same for steady state error and only better for SAC in transient response. However, for the case of changed supply pressure, SAC response is improved with much smaller error and shorter time for recovering into specified error band in advance than PID response. These results prove that SAC deals with the variable supply pressure well even the changing is very fast. Hence, the robustness of SAC should be applied in the systems with fast changing of supply pressure.
Design Optimization of Single-Stage Launch Vehicle Using Hybrid Rocket Engine
Kanazaki, Masahiro,Ariyairt, Atthaphon,Yoda, Hideyuki,Ito, Kazuma,Chiba, Kazuhisa,Kitagawa, Koki,Shimada, Toru The Society for Aerospace System Engineering 2015 International Journal of Aerospace System Engineer Vol.2 No.2
The multidisciplinary design optimization (MDO) of a launch vehicle (LV) with a hybrid rocket engine (HRE) was carried out to investigate the ability of an HRE for a single-stage LV. The non-dominated sorting genetic algorithm-II (NSGA-II) was employed to solve two design problems. The design problems were formulated as two-objective cases involving maximization of the downrange distance over the target flight altitude and minimization of the gross weight, for two target altitudes: 50.0 km and 100.0 km. Each objective function was empirically estimated. Several non-dominated solutions were obtained using the NSGA-II for each design problem, and in each case, a trade-off was observed between the two objective functions. The results for the two design problem indicate that economical performance of the LV is limited with the HRE in terms of the maximum downrange distances achievable. The LV geometries determined from the non-dominated solutions were examined.
Maltitol Prevents the Progression of Fatty Liver Degeneration in Mice Fed High-Fat Diets
Hayato Urushima,Yasuaki Sanada,Miki Sakaue,Yuji Matsuzawa,Toshinori Ito,Kazuhisa Maeda 한국식품영양과학회 2015 Journal of medicinal food Vol.18 No.10
Nonalcoholic fatty liver disease (NAFLD) progresses to nonalcoholic steatohepatitis, ultimately leading tocirrhosis and liver cancer. It is important to prevent this progression during the initial stages of hepatic fatty degeneration. Maltitol is a polyol produced by the hydrogenation of maltose. We investigated the efficacy of maltitol for treating hepaticfatty degeneration in C57BL/6 male mice using a high-fat diet model. Intake of 5.0% maltitol for 8 weeks significantlysuppressed weight gain, hepatic fatty degeneration, hyperglycemia, and hypercholesterolemia. With maltitol intake, sterolregulatory element-binding protein 1c (SREBP1c) mRNA expression was significantly decreased, and farnesoid X receptor(FXR), peroxisome proliferator-activated receptor α (PPARα), and hydroxymethylglutaryl-Co reductase expressions weresignificantly higher in the liver. The increase in SREBP1c and suppression of FXR and PPARa expressions are correlated withNAFLD. Our results suggest that maltitol may prevent steatosis of NAFLD with a high-fat diet.
Hatanaka, Takaaki,Ohzono, Shinji,Park, Mirae,Sakamoto, Kotaro,Tsukamoto, Shogo,Sugita, Ryohei,Ishitobi, Hiroyuki,Mori, Toshiyuki,Ito, Osamu,Sorajo, Koichi,Sugimura, Kazuhisa,Ham, Sihyun,Ito, Yuji American Society for Biochemistry and Molecular Bi 2012 The Journal of biological chemistry Vol.287 No.51