http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
신성환,Shin, Sung-Hwan,Hashimoto, Takeo 한국음향학회 2013 韓國音響學會誌 Vol.32 No.4
자동차 엔진을 포함한 구동계 및 흡배기계 소음의 특징은 차수 스펙트럼(order spectrum) 분석으로 파악할 수 있다. 기존의 선행 연구에서는 엔진의 1차 및 2차 점화주파수(firing frequency)와 관련된 차수성분이 차실내부 소음에 주요한 영향을 미치는 것으로 알려져 있다. 본 연구에서는 차수스펙트럼의 변환에 따른 차실내부 소음의 음질(쾌적감) 차이를 파악하고자 한다. 이를 위하여 6실린더 및 4실린더 가솔린 엔진을 가진 승용차의 차실 내부 소음을 측정하고, 이 소음에 적응형 디지털 필터(adaptive digital filter)를 적용하여 차수레벨을 가감하는 방법으로 수정한다. 쌍비교법을 이용한 청음실험을 통하여 원음 및 편집음의 음질 정도를 평가하고, 음질 향상을 위한 차수스펙트럼 변화 방향을 제시한다. 결과적으로 반-차수(half-order) 성분의 차수레벨 감소가 차실내부 소음의 쾌적감 향상에 영향을 주는 반면, 점화차수 레벨의 감소가 항상 음질에 긍정적인 영향을 주는 것은 아님을 파악하였다. Order spectrum analysis is widely used to grasp the features of noises due to powertrain system including engine and intake/exhaust system. It is known from many previous researches that order components related to the first and second firing frequencies of engine considerably affect the noise of car interior. The purpose of this paper is to find out the difference in sound quality: Pleasantness of car interior noise according to the change of its order spectrum. For this, car interior noises of 6-cylinder and 4-cylinder engines are recorded and their order spectrum levels are modified by applying adaptive digital filters. After subjective listening test employing paired comparison method is conducted, it is investigated that the level change of half-order components is a noticeable factor to improve Pleasantness of the car interior noises whereas level decrease of firing order does not always give the positive effect on its sound quality.
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.
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.
신승호(Seung-Ho Shin),橋本典明(Noriaki Hashimoto) 한국항해항만학회 2003 한국항해항만학회지 Vol.27 No.2
해상수송의 안전성을 개선하는 하나의 수단으로서, 해상풍 정보로부터 예정 항로상에서 조우하게될 파랑정보를 높은 정일도로 예측하여 단시간에 본선에 제공할 수 있는 시스템을 개발할 필요가 있다. 본 연구에서는 이의 제1단계로서 대양에서의 다방향 불규칙파 예측을 위한 파랑추산모델을 제시하였다. 검토방법으로는 과거 실제 해역에서 발생한 황천에 기인한 선박 침몰사고를 대상으로 선박의 항행 일정에 따른 해상풍의 분석 및 파랑추산시뮬레이션을 수행하였으며, 이로부터 사고 선박이 조우한 海象을 평가하고 모델의 재현성 및 정도를 검토하였다. 연구의 결과, 사고 선박은 침몰사고의 원인이 Okhotsk해에서 발달한 저기압에 의해 급속히 성장한 고파랑 해역을 회피하지 못하여 발생한 것에 있음을 명백히 하였으며, 본 계산에 이용한 제3세대 파랑추산모델(WAM)로부터의 결과는 실제 관측 파랑의 유의파고, 주기, 방향 스펙트럼 등 항행관련의 파랑제원과 잘 부합되었으며, 실용 선박에서의 예측시스템 구축에 적용성이 양호한 것으로 나타났다. In order to improve navigational safety of ships, an ocean wave prediction model of high precision within a short time, dealing with multi-directional random waves from the information of the sea surface winds encountered at the planned ship’s course, was introduced for construction of ocean wave forecasting system on the ship. In this paper, we investigated a sea disaster occurred by a stormy weather in the past. We analyzed the sea surface winds first and then carried out ocean wave hindercasting simulations according to the coutes of the sunken vessel. From the result of this study, we concluded that the sea disaster was caused by rapidly developed low pressure system in Okhotsk Sea and the predicted values by the third generation wave prediction model(WAM) was agreed well with the observed significant wave height, wave period, and directional wave spectrum. It gives a good applicability for construction of a practical on-board calculation system.