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Seongkon Lee,Gento Mogi,Masanari Koike,K.S Hui,Jongwook Kim 대한산업공학회 2009 대한산업공학회 춘계학술대회논문집 Vol.2009 No.5
Korean economy is easily affected by the fluctuation of oil price change, as exemplified by the fact that Korea is the 10th largest energy consumer in the World and also has poor natural resources. The best way to solve the Korean energy environment is the development of energy technologies with well focused R&D strategically. In this research, we established the mid-term strategic energy technology development plan, which was supported by the Korean research council for public science and technology (KORP). We applied the data envelopment analysis (DEA) Scale Efficiency approach to measure the relative efficiency of 9 strategic energy technologies, which have focused on producing world class research outcomes within 5 years from 2007 to 2011. We analyzed the econometric efficiency of developing 9 strategic energy technologies and suggested the prioritization of 9 energy technologies for well focused R&D. The result will provide the energy policy makers with the fundamental data as planning for producing world class research outcomes instead of routine outputs related to the energy policy sector.
Seongkon Lee,Gento Mogi,Masanari Koike,K.S Hui,Jongwook Kim 한국경영과학회 2009 한국경영과학회 학술대회논문집 Vol.2009 No.5
Korean economy is easily affected by the fluctuation of oil price change, as exemplified by the fact that Korea is the 10th largest energy consumer in the World and also has poor natural resources. The best way to solve the Korean energy environment is the development of energy technologies with well focused R&D strategically. In this research, we established the mid-term strategic energy technology development plan, which was supported by the Korean research council for public science and technology (KORP). We applied the data envelopment analysis (DEA) Scale Efficiency approach to measure the relative efficiency of 9 strategic energy technologies, which have focused on producing world class research outcomes within 5 years from 2007 to 2011. We analyzed the econometric efficiency of developing 9 strategic energy technologies and suggested the prioritization of 9 energy technologies for well focused R&D. The result will provide the energy policy makers with the fundamental data as planning for producing world class research outcomes instead of routine outputs related to the energy policy sector.
Guide Following Control Using Laser Range Sensor for a Smart Wheelchair
Koji Miyazaki,Masafumi Hashimoto,Masanari Shimada,Kazuhiko Takahashi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
This paper presents a guide following control(adriving support control) for a smart electric wheelchair, so that the wheelchair can follow a preceding person(guide). A walking guide is obtained from lasers can images by a nin-vehicle laser range sensor based on Kalman filter and data association, and the guide foot print is estimated. Based on position data of the foot print, acubicspline generate satarget path for the wheelchair. The wheelchair is controlled so that it can move along the guide foot print at a constant gap between the wheelchair and the guide. The experimental result validated the feasibility of the control method.
Taro Shibuki,Kei Okumura,Masanari Sekine,Ikuhiro Kobori,Aki Miyagaki,Yoshihiro Sasaki,Yuichi Takano,Yusuke Hashimoto 대한소화기내시경학회 2023 Clinical Endoscopy Vol.56 No.6
Background/Aims: Covered self-expandable metallic stents (cSEMS) have become popular for endoscopic ultrasound-guided hepati-cogastrostomy with transmural stenting (EUS-HGS). We compared the time to recurrent biliary obstruction (TRBO), complications,and reintervention rates between EUS-HGS using plastic stent (PS) and cSEMS in patients with unresectable malignancies at multi-center institutions in Japan. Methods: Patients with unresectable malignant biliary obstruction who underwent EUS-HGS between April 2015 and July 2020 at anyof the six participating facilities were enrolled. Primary endpoint: TRBO; secondary endpoints: rate of complications other than recur-rent biliary obstruction and technical success rate of reintervention were evaluated. Results: PS and cSEMS were used for EUS-HGS in 109 and 43 patients, respectively. The TRBO was significantly longer in the cSEMSgroup than in the PS group (646 vs. 202 days). Multivariate analysis identified two independent factors associated with a favorableTRBO: combined EUS-guided antegrade stenting with EUS-HGS and the use of cSEMS. No significant difference was observed in therate of complications other than recurrent biliary obstruction between the two groups. The technical success rate of reintervention was85.7% for PS and 100% for cSEMS (p=0.309). Conclusions: cSEMS might be a better option for EUS-HGS in patients with unresectable malignancies, given the longer TRBO.
Rheological characteristics of non-spherical graphite suspensions
Mustafa, Hiromoto Usui,Ishizuki, Masanari,Shinge, Ibuki,Suzuki, Hiroshi The Korean Society of Rheology 2003 Korea-Australia rheology journal Vol.15 No.1
Since the microstructure of functional thin films depends on the dispersion characteristics of dense slurry, it is important to control the agglomerative nature of slurries under processing. The present authors have been discussing the model prediction of agglomerative nature and local rate of agglomeration in dense suspensions. The experiments have been peformed under shear flow using the nearly spherical and oblate type graphite particles. In this study, the experiment has been conducted using water and glycerol as dispersion media. Stress control type rheometer was used to measure the slurry rheology. Local agglomeration of graphite particles has been predicted by using Usui's model. The experimental results show that both the shape and slurry processing method affect on the local dispersion condition. The agglomeration formed by oblate type graphite particles seems to be more difficult to break up than that of spherical particles.
Causal association of body mass index with hypertension using a Mendelian randomization design
Lee, Mee-Ri,Lim, Youn-Hee,Hong, Yun-Chul,Kuwabara., Masanari Williams & Wilkins Co 2018 Medicine Vol.97 No.30
<▼1><P>Supplemental Digital Content is available in the text</P></▼1><▼2><P><B>Abstract</B></P><P>Observational studies have shown that obesity is a major risk factor for hypertension, but unmeasured confounding factors may exist. We used Mendelian randomization (MR) to assess the causal effect of obesity on hypertension.</P><P>The MR analysis was performed in a well-defined community cohort study of 8832 middle-aged (40–69 years) adults in Korea enrolled from 2001 to 2013. We used baseline hypertension and newly diagnosed hypertension during the 10-year follow-up period as the outcome variable. Genetic risk score associated with body mass index (BMI GRS) was used as the instrumental variable (IV) to measure the causal relationship between obesity and hypertension. The IV estimate of causal odds ratio (OR) was derived using the Wald ratio estimator and then exponentiation to express the result as an OR.</P><P>In the multivariable model adjusting for age, sex, study area, education, smoking, and current alcohol consumption, each 1 kg/m<SUP>2</SUP> increase in BMI was associated with a 19% (OR: 1.19, 95% confidence interval [CI]: 1.17–1.21) increase in hypertension risk. We selected 6 single-nucleotide polymorphisms (<I>P</I> < 1.0 × 10<SUP>−5</SUP>) associated with BMI by genome-wide screening using linear regression and created 6 types of GRS. We demonstrated that each standard-deviation increase in BMI GRS was associated with a 5% to 6% (OR: 1.05–1.06) increased risk of hypertension (all <I>P</I> < .05). Using BMI GRS as the IV, we found a causal relationship between BMI and hypertension (OR: 1.13–1.26, all <I>P</I> < .05 except weighted GRS [n = 6]).</P><P>Using Mendelian randomization, we found that obesity is causally associated with hypertension. This information will have important public health implications, supporting evidence that obesity-reduction programs will reduce the incidence of hypertension.</P></▼2>