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.

Cathodic Reaction of Perovskite Oxide Electrodes on a Proton Conducting Electrolyte

Suzuki, Kota,Hashimoto, Shin-ichi,Yashiro, Keiji,Amezawa, Koji,Kawada, Tatsuya The Electrochemical Society 2013 ECS transactions Vol.57 No.1

<P>Cathodic reaction of protonic ceramic fuel cells (PCFCs) using SrZrO<SUB>3</SUB> based proton conducting electrolyte with perovskite oxide cathode is studied. A dense La<SUB>0.6</SUB>Sr<SUB>0.4</SUB>CoO<SUB>3</SUB> (LSC) film is fabricated on 10mol% Y-doped SrZrO<SUB>3</SUB> (SZY) electrolyte using pulsed laser deposition (PLD) method as a cathode. Cathodic performance of the dense LSC electrode is evaluated using AC impedance measurement and Secondary Ion Mass Spectroscopy (SIMS) analysis. Impedance spectra suggest that LSC dense film play a role as proton blocking electrode. SIMS analysis reveals that proton concentration in LSC dense film is higher than bulk of LSC, and there is no concentration gradient in LSC and SZY. Therefore, it is suggested that proton surface exchange rate of LSC is very low.</P>

Nanocomposite Ni-CGO Synthesized by the Citric Method as a Substrate for Thin-film IT-SOFC

Wang, Zhenwei,Liu, Yu,Hashimoto, Shin-ichi,Mori, Masashi The Korean Ceramic Society 2008 한국세라믹학회지 Vol.45 No.12

Ni-ceria cermets have been extensively investigated as candidates for the anode in intermediate-temperature solid oxide fuel cells. We have used the citric method to synthesize nanocomposite powders consisting of NiO (Ni metal content: $40{\sim}60%$ by volume) highly dispersed in $Ce_{0.9}Gd_{0.1}O_{1.95}$ (CGO). The microstructure characteristics and sintering behaviors of the nanocomposites were investigated. No impurity phases were observed and the shrinkage of these substrates matched well with that of a CGO electrolyte with a specific surface area of $11\;m^2/g$. Densification of the CGO electrolyte layer to $<5\;{\mu}m$ thickness was achieved by co-firing the laminated electrolyte with the porous NiO-CGO substrate at $1400^{\circ}C$ for 6 h.

Small Bowel Obstruction After Ileal Pouch-Anal Anastomosis With a Loop Ileostomy in Patients With Ulcerative Colitis

Hitoshi Kameyama,Yoshifumi Hashimoto,Yoshifumi Shimada,Saki Yamada,Ryoma Yagi,Yosuke Tajima,Takuma Okamura,Masato Nakano,Kohei Miura,Masayuki Nagahashi,Jun Sakata,Takashi Kobayashi,Shin-ichi Kosugi,To 대한대장항문학회 2018 Annals of Coloproctolgy Vol.34 No.2

Purpose: Small bowel obstruction (SBO) remains a common complication after pelvic or abdominal surgery. However, the risk factors for SBO in ulcerative colitis (UC) surgery are not well known. The aim of the present study was to clarify the risk factors associated with SBO after ileal pouch-anal anastomosis (IPAA) with a loop ileostomy for patients with UC. Methods: The medical records of 96 patients who underwent IPAA for UC between 1999 and 2011 were reviewed. SBO was confirmed based on the presence of clinical symptoms and radiographic findings. The patients were divided into 2 groups: the SBO group and the non-SBO group. We also analyzed the relationship between SBO and computed tomography (CT) scan image parameters. Results: The study included 49 male and 47 female patients. The median age was 35.5 years (range, 14–72 years). We performed a 2- or 3-stage procedure as a total proctocolectomy and IPAA for patients with UC. SBO in the pretakedown of the loop ileostomy after IPAA occurred in 22 patients (22.9%). Moreover, surgical intervention for SBO was required for 11 patients. In brief, closure of the loop ileostomy was performed earlier than expected. A multivariate logistic regression analysis revealed that the 2-stage procedure (odds ratio, 2.850; 95% confidence interval, 1.009–8.044; P = 0.048) was a significant independent risk factor associated with SBO. CT scan image parameters were not significant risk factors of SBO. Conclusion: The present study suggests that a 2-stage procedure is a significant risk factor associated with SBO after IPAA in patients with UC.

Nanocomposite Ni-CGO Synthesized by the Citric Method as a Substrate for Thin-film IT-SOFC

Zhenwei Wang,Yu Liu,Shin-ichi Hashimoto,Masashi Mori 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.12

Ni-ceria cermets have been extensively investigated as candidates for the anode in intermediate-temperature solid oxide fuel cells. We have used the citric method to synthesize nanocomposite powders consisting of NiO (Ni metal content: 40~60% by volume) highly dispersed in Ce0.9Gd0.1O1.95 (CGO). The microstructure characteristics and sintering behaviors of the nanocomposites were investigated. No impurity phases were observed and the shrinkage of these substrates matched well with that of a CGO electrolyte with a specific surface area of 11 m2/g. Densification of the CGO electrolyte layer to <5 μm thickness was achieved by co-firing the laminated electrolyte with the porous NiO-CGO substrate at 1400oC for 6 h. Ni-ceria cermets have been extensively investigated as candidates for the anode in intermediate-temperature solid oxide fuel cells. We have used the citric method to synthesize nanocomposite powders consisting of NiO (Ni metal content: 40~60% by volume) highly dispersed in Ce0.9Gd0.1O1.95 (CGO). The microstructure characteristics and sintering behaviors of the nanocomposites were investigated. No impurity phases were observed and the shrinkage of these substrates matched well with that of a CGO electrolyte with a specific surface area of 11 m2/g. Densification of the CGO electrolyte layer to <5 μm thickness was achieved by co-firing the laminated electrolyte with the porous NiO-CGO substrate at 1400oC for 6 h.

Investigation of Li Dopant as a Sintering Aid for ScSZ Electrolyte for IT-SOFC

Mori, Masashi,Liu, Yu,Ma, Shuhua,Hashimoto, Shin-ichi,Takei, Katsuhito The Korean Ceramic Society 2008 한국세라믹학회지 Vol.45 No.12

In this study, the effects of small amounts (${\leq}3\;mol%$) of Li doping on the sintering characteristics and electrochemical performance of $(ZrO_2)_{0.89}(ScO_{1.5})_{0.1}(CeO_2)_{0.01}$ (ScSZ) were investigated. By adding 3 mol% lithium, the densification temperature of ScSZ was reduced from the conventional temperature of $1400^{\circ}C$ to $1200^{\circ}C$. It was found that Li doping also led to changes in the Zr:Sc ratio at the grain boundaries. Correspondingly, the dispersion of lithium zirconia at the grain boundaries accelerated the growth of ScSZ grains and increased the grain boundary resistance at temperatures below $450^{\circ}C$. At elevated temperatures of $450{\sim}750^{\circ}C$, the electrical conductivity of the ScSZ after doping remained almost unchanged under air and reducing atmospheres. These results suggest that the addition of lithium is promising for use in low temperature co-firing of ScSZ-based components for intermediate temperature solid oxide fuel cells.

Investigation of Li Dopant as a Sintering Aid for ScSZ Electrolyte for IT-SOFC

Masashi Mori,Yu Liu,Shuhua Ma,Shin-ichi Hashimoto,Katsuhito Takei 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.12

In this study, the effects of small amounts (≤3 mol%) of Li doping on the sintering characteristics and electrochemical performance of (ZrO2)0.89(ScO1.5)0.1(CeO2)0.01 (ScSZ) were investigated. By adding 3 mol% lithium, the densification temperature of ScSZ was reduced from the conventional temperature of 1400oC to 1200oC. It was found that Li doping also led to changes in the Zr:Sc ratio at the grain boundaries. Correspondingly, the dispersion of lithium zirconia at the grain boundaries accelerated the growth of ScSZ grains and increased the grain boundary resistance at temperatures below 450oC. At elevated temperatures of 450~750oC, the electrical conductivity of the ScSZ after doping remained almost unchanged under air and reducing atmospheres. These results suggest that the addition of lithium is promising for use in low temperature co-firing of ScSZ-based components for intermediate temperature solid oxide fuel cells. In this study, the effects of small amounts (≤3 mol%) of Li doping on the sintering characteristics and electrochemical performance of (ZrO2)0.89(ScO1.5)0.1(CeO2)0.01 (ScSZ) were investigated. By adding 3 mol% lithium, the densification temperature of ScSZ was reduced from the conventional temperature of 1400oC to 1200oC. It was found that Li doping also led to changes in the Zr:Sc ratio at the grain boundaries. Correspondingly, the dispersion of lithium zirconia at the grain boundaries accelerated the growth of ScSZ grains and increased the grain boundary resistance at temperatures below 450oC. At elevated temperatures of 450~750oC, the electrical conductivity of the ScSZ after doping remained almost unchanged under air and reducing atmospheres. These results suggest that the addition of lithium is promising for use in low temperature co-firing of ScSZ-based components for intermediate temperature solid oxide fuel cells.

Recent Advances in Functional Genomics of the Silkworm

Toru Shimada,Takaaki Daimon,Shunsuke Funaguma,Manabu Ote,Susumu Katsuma,Yutaka Suzuki,Sumio Sugano,Shin-ichi Hashimoto,Masataka G. Suzuk,Toshiki Tamura 한국응용곤충학회 2005 한국응용곤충학회 학술대회논문집 Vol.2005 No.05