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Adjustable High Frequency Quasi-Resonant Inverter for Induction Heating
Saso, Kazuki,Ito, Takahiro,Ishimaru, Yusuke,Matsuse, Kouki,Tsukahara, Masayoshi The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.1
This paper presents the considerations of driving the Adjustable Frequency Quasi-Resonant Inverter Circuit in the high frequency. This inverter is requested to output frequency from 160kHz to 400kHz. Resonant inverter used for metalworking by the induction heating. In induction heating, high frequency can heat the shallow point, and low frequency can heat the deep point. So when heated depth is replaced, the frequency that inverter must output is different. It is necessary for the inverter to output two or more frequencies. In addition, in the heat-treatment called the hardening, only the metal surface must be heated. So, to heat-treat metal that a radius is small, it is necessary for the inverter to output high frequency. This inverter can output the frequency more than 100kHz by using Power Metal Oxide Semiconductor Field Effect Transistor (MOSFET) as power device. The circuit includes the first resonant capacitor and second one with a one-way short-circuit switch. Because synthetic series capacitance is varied by manipulating the switch, this inverter can change a period during a half period. We confirmed this inverter can output an arbitrary frequency by the experiment.
Individual Identification by Gait Vibration Data Transmitted Floor
Yuichi Nakamura,Kazuki Ito,Tatsuo Hasegawa,Shin Itami,Yohei Saika,Masahiro Nakagawa 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
The establishment of variety methods in the individual identification technology is desirable. In this study, it is considered that the method of individual identification from vibration data generated in gait. In the walking motion, the unique information such as the individual’s body type and habit is contained. It is assumed that the unique information is reflected in the gait vibration data transmitted in the floor. The potential for application to individual identification is shown by extracting one step and analyzing the unique information from the gait vibration data. The Adaboost method is applied to the extraction of one step of the walking. In order to represent the characteristics of each individual and analyzed using the Principal Component Analysis.
Yuichi Sato,Hirotoshi Hatori,Suguru Igarashi,Manabu Arai,Kazuki Ito,Syota Kikuchi 한국물리학회 2010 Current Applied Physics Vol.10 No.3
Cadmium telluride (CdTe) thin films were grown on sapphire c-face single-crystal substrates by vacuum evaporation. Prior to growing the CdTe thin films, conducting thin films of Ni, Mo, Ti and titanium nitride (TiN) were grown on the sapphire substrates. The crystallinities and photoluminescence (PL) properties of the CdTe thin films grown on the various conducting thin films were investigated and they were compared with those of CdTe thin films grown directly on sapphire substrates without a conducting thin film. CdTe thin films with relatively high crystallinities were obtained when Ti and TiN were used as the conducting thin film. Therefore, the PL properties of the CdTe thin films on such conducting thin films were not inferior to those of the CdTe thin film grown directly on the sapphire substrate. The effect of the Cd and Te supply ratio on the properties of the CdTe thin films was also investigated. The CdTe thin films had much higher crystallinities when they were grown in Te-rich conditions than in Cd-rich conditions.
Yasuhiro Shiga,Go Kubota,Sumihisa Orita,Kazuhide Inage,Hiroto Kamoda,Masaomi Yamashita,Toru Iseki,Michihiro Ito,Kazuyo Yamauchi,Yawara Eguchi,Takeshi Sainoh,Jun Sato,Kazuki Fujimoto,Koki Abe,Hirohito 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.3
Study Design: Controlled laboratory study. Purpose: This study aimed to evaluate the efficacy of platelet-rich plasma (PRP) stored at room temperature (RT), frozen, or after freeze-drying. Overview of Literature: PRP enriches tissue repair and regeneration, and is a novel treatment option for musculoskeletal pathologies. However, whether biological activity is preserved during PRP storage remains uncertain. Methods: PRP was prepared from blood of 12 healthy human volunteers (200 mL/person) and stored using three methods: PRP was stored at RT with shaking, PRP was frozen and stored at –80°C, or PRP was freeze-dried and stored at RT. Platelet counts and growth factor content were examined immediately after preparation, as well as 2, 4, and 8 weeks after storage. Platelet activation rate was quantified by flow cytometry. Results: Platelet counts were impossible to determine in many RT samples after 2 weeks, but they remained at constant levels in frozen and freeze-dried samples, even after 8 weeks of storage. Flow cytometry showed approximately 80% activation of the platelets regardless of storage conditions. Almost no growth factors were detected in the RT samples after 8 weeks, while low but significant expression was detected in the frozen and freeze-dried PRP. Over time, the mean relative concentrations of various growth factors decreased significantly or disappeared in the RT group. In the frozen group, levels were maintained for 4 weeks, but decreased significantly by 8 weeks (p <0.05). The freeze-dried group maintained baseline levels of growth factors for the entire 8-week duration. Conclusions: Freeze-drying enables PRP storage while maintaining bioactivity and efficacy for extended periods.