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RISS 인기검색어
- 검색키워드
- 저자 : Takehiro Kimura (검색결과 2 건)
- 무료
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Isobe, Noriyuki,Komamiya, Takehiro,Kimura, Satoshi,Kim, Ung-Jin,Wada, Masahisa Elsevier 2018 INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES Vol.117 No.-
<P><B>Abstract</B></P> <P>Cellulose hydrogel from aqueous solution of lithium bromide demonstrated excellent tunability of mechanical property and shape. A series of compression tests showed that cellulose hydrogel covered a wide range of mechanical property, where the compressive Young's modulus was controllable from 30 kPa to 1.3 MPa by changing the initial concentration of cellulose solution. Meanwhile, the diameter of the building block of gel, namely nano-fibrous cellulose, was constant at 15–20 nm irrelevant of the initial concentration of cellulose solution. Moreover, thanks to the biocompatibility of cellulose, the cultivation of cartilage tissue was successful in the micro-porous sponge-like cellulose hydrogel prepared by salt-leaching process. These findings show that this environmentally-benign versatile gel offers a new substrate for the biomaterial-based nanomaterial in biomedical applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Cellulose hydrogel with various shapes from rigid cylinder to soft sponge is prepared. </LI> <LI> Mechanical property of hydrogel is controllable by the initial input of cellulose. </LI> <LI> Compressive modulus is classed in the stiffest porous material. </LI> <LI> Nano-fibrous network structure is a building block of cellulose hydrogel. </LI> <LI> Biocompatibility is evidenced by successful cultivation of tissue inside soft gel. </LI> </UL> </P>
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Flight Control Simulators for Unmanned Fixed-Wing and VTOL Aircraft
Naoharu Yoshitani,Shin-ichi Hashimoto,Takehiro Kimura,Kazuki Motohashi,Shoh Ueno 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Flight control simulators for fixed-wing air craft and VTOL(VerticalTake-offandLanding) air craft have been developed for understanding flight control dynamics and for improving control strategies and performances. They simulate automatic control of a flight path of the aircraft, using six-degree-of-freedom nonlinear equation store present aircraft dynamics. The control system is multi-layered. For fixed-wing aircraft, it consists of flight-path controller, heading and flight-path angle controller, acceleration controller and attitude controller. The control strategy is based on ’required acceleration’, proposed by the first author. On the other hand, the VTOL aircraft is of ducted-fantype. It has apropeller at the top of the duct, fixed vanes below it to cancel the counter torque of the propeller, and control vanes to control the attitude. The simulators have proved effective in testing and improving aircraft control strategies.
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