http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
조향감과 차량 안정성 향상을 위한 Steer-by-Wire 제어기 개발
장재호(Jaeho Jang),박동진(Tongjin Park),오세욱(Sewook Oh),장석환(Seokhwan Jang),한창수(Changsoo Han) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
In this paper, the SBW controller was developed for improving the steering feel and vehicle stability. There are two motors in SBW system controlled by one ECU. One motor in steering wheel is to improve driver's steering feel and the other motor in steering linkage is to improve the vehicle maneuverability and stability. The steering wheel and front wheel modeling is designed using bond graph method. The control aim of the steering wheel motor is that the equation of the steering wheel motor has output torque for following steering feel as a conventional steering system At high speeds, vehicle stability could be compensated using the under steer gradient and yaw rate feedback control minimizing a side-slip angle. As a result the performance of the SBW controller can be verified the controller of an SBW shows the as good performances as through the full-vehicle simulations and the controller was available for improving steering feel and vehicle stability.
Miae Jang,이연지,Jiho Choi,Beomseok Kim,Jayeon Kang,Yongchae Kim,,Sewook Cho 대한가정의학회 2015 Korean Journal of Family Medicine Vol.36 No.6
Background: Pregnancy considerably alters cardiovascular dynamics, and thereby affects the transition of blood pressure after delivery in women. We aimed to analyze the association between parity and blood pressure in Korean adult women. Methods: We included 8,890 women who participated in Korean National Health and Nutrition Examination Survey between 2010 and 2012. We divided the population according to the menopause status and analyzed the association between parity and blood pressure by using multiple regression analysis, and on hypertension, by using logistic regression analysis. Results: Systolic and diastolic blood pressures were significantly associated with parity in premenopausal women (β=-0.091 [P<0.001] and β=-0.069 [P<0.001], respectively). In the analysis that excluded women receiving antihypertensive medication, the systolic and diastolic blood pressure of postmenopausal women were significantly associated with parity (β=-0.059 [P=0.022] and β=-0.054 [P=0.044], respectively). Parity was found to prevent hypertension after adjustment for confounders in postmenopausal women (odds ratio, 0.55; 95% confidence interval, 0.310–0.985). Conclusion: We found that parity prevented hypertension in Korean women.
Bae, Kiho,Lee, Sewook,Jang, Dong Young,Kim, Hyun Joong,Lee, Hunhyeong,Shin, Dongwook,Son, Ji-Won,Shim, Joon Hyung American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.14
<P>In this study, we used a compositionally gradient anode functional layer (AFL) consisting of Ni-BaCe0.5Zr0.35Y0.15O3-delta (BCZY) with increasing BCZY contents toward the electrolyte -anode interface for high-performance protonic ceramic fuel cells. It is identified that conventional homogeneous AFLs fail to stably accommodate a thin film of BCZY electrolyte. In contrast, a dense 2 mu m thick BCZY electrolyte was successfully deposited onto the proposed gradient AFL with improved adhesion. A fuel cell containing this thin electrolyte showed a promising maximum peak power density of 635 mW cm(-2) at 600 degrees C, with an open-circuit voltage of over 1 V. Impedance analysis confirmed that minimizing the electrolyte thickness is essential for achieving a high power output, suggesting that the anode structure is important in stably accommodating thin electrolytes.</P>
Byeongil Lee,Namtae Kim,Sewook Jang,Jeong Hyeon Park,송민규,Kuktae Kwon,Seung Hee Kim,김영규 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
Insensitive munitions (IMs) that suit safety requirements have received much attention to prevent anaccidental explosion of the munition by external stimuli. For example, 1,3,5-trinitro-1,3,5-triazinane(RDX), a sensitive legacy explosive material with high explosive performance, is usually used togetherwith insensitive explosives such as 2,4,6-triamino-1,3,5-trinitrobenzene (TATB) in IM formulation to fitthe safe operational range of sensitivities. In recent decades, the development of new high energy materials(HEMs) with remarkable insensitivities have become a forefront topic of the energetic material field. Herein, we report a novel HEM based on a hexaaza[3.3.3]propellane skeleton, 2,6-dinitro-3,7,10-trioxo-2,4,6,8,9,11-hexaaza[3.3.3]pro-pellane (5), which was determined to have high explosive performancealong with reduced sensitivity to external stimuli. Both the measured explosive performances and theimpact sensitivity of 5 were better than those of TATB. We propose 5 as a promising insensitive HEMand a potential candidate for IM.
Novel 4,5-Dinitro-N,N′-dialkylimidazolium Cations as Candidates for High-energy Materials
Namtae Kim,Byeongil Lee,송민규,Sewook Jang,Kuktae Kwon,김승희,김영규 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.3
In the synthesis of energetic ionic liquids (EILs), the quaternization of dinitroimidazoles remains a challenging task due to their reduced nucleophilicity. In this study, two new EILs precursors, 3-ethyl-1-methyl-4,5-dinitro-1H-imidazol-3-ium tetrafluoroborate (1) and 1,3-diethyl-4,5-dinitro-1H-imidazol-3-ium tetrafluoroborate (2) were obtained via the alkylation of 1-methyl-4,5-dinitro-1H-imidazole and 4,5-dinitro-1H-imidazole using Meerwein's reagents, respectively. The 4,5-dinitroimidazolium cations are expected to be applied for new insensitive high-energy materials (HEMs) via an anion metathesis reaction with energetic anions. Two new EILs, 3-ethyl-1-methyl-4,5-dinitro-1H-imidazol-3-ium 2,4,5-trinitroimidazol-1-ide (3) and 1,3-diethyl-4,5-dinitro-1H-imidazol-3-ium 2,4,5-trinitroimidazol-1-ide (4), were obtained as potential HEMs via the anion metathesis reaction with 2,4,5-trinitroimidazol-1-ide. Although some improvements in the thermal properties are desired, compound 3 showed the promising properties as a new insensitive HEM because of its excellent insensitivity and more powerful explosive performance than those of 2,4,6-trinitrotoluene (TNT).