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Enhanced performance of graphene by using gold film for transfer and masking process
최진우,김혜지,박재현,M. Waqas Iqbal,M. Zahir Iqbal,엄종화,정종완 한국물리학회 2014 Current Applied Physics Vol.14 No.8
In this study, we tried to reduce the organic contamination of graphene. This organic contamination most likely occurs during the graphene transfer and lithography steps, which in turn degrades the quality of the graphene. Inorganic Au film was applied for Au-assisted transfer instead of the conventional thin poly(methyl methacrylate), and a new fabrication process using the Au-film for the transfer and masking layer was designed in order to minimize the contamination of graphene from organic residues. As a result, we demonstrated that the overall qualities of the transferred graphene film and graphene transistors have been highly improved. These improvements include an enhancement of mobility, and a decrease of defects, unintentional doping, contact resistance, and sheet resistance.
Mechatronic Analysis for Feeding a Structure of a Machine Tool Using Multi-body Dynamics
최진우 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.5
In this study, a rigid multi-body dynamic model has been developed for mechatronic analysis to evaluate dynamic behavior of a machine tool. The development environment was the commercialized analysis tool, ADAMS, for rigid multi-body dynamic analysis. A simplified servo control logic was implemented in the tool using its functions in order to negate any external tool of control definition. The advantage of the internal implementation includes convenience of the analysis process by saving time and efforts. Application of this development to a machine tool helps to evaluate its dynamic behavior against feeding its component, to calculate the motor torque, and to optimize parameters of the control logic.
최진우,문원진,최나미,노홍기,김미영,김나라,문승규,정현우,임소덕,양정현 대한영상의학회 2015 Korean Journal of Radiology Vol.16 No.1
Charcoal can be used for preoperative localization of metastatic lymph nodes in the neck. Charcoal remains stable without causing foreign body reactions during as hort period. However, foreign body reactions may develop if charcoal is left in situ for more than 6 months. We reported a case of charcoal granuloma mimicking local recurrence on fluorodeoxyglucose-positron emission tomography/computed tomography and ultrasonography in a 47-year-old woman who had cervical lymph node dissection due to metastatic invasive ductal carcinoma of the breast.
Guidelines for Optimal Bearing Locations for High Dynamic Stiffness of a Machine Tool Spindle
최진우 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.5
In this study, to a high rigidity of the machine tool spindle system design guidelines developed for determining the optimum position of the main shaft bearing. Spindle system mainly shaft, cutting tool, motor, and consists of a bearing. As part of the bearings supporting the axis position has a great impact on the odds and ends of the spindle. Guidelines have been developed based on the results of the static rigidity and frequency finite element analysis, according to various bearing position. Using a suitable type of element, such as a spring element for a joint mass element and the bearing stiffness for cutting tools developed integrated analysis model for both static and modal analysis. This design guideline is expected to help to determine the best approximation to the principal axis position of the bearing system design minimum time and effort.
수술중 주입한 dexmedetemidine 또는 fentanyl이 주술기 혈역학, 최면, 진정과 술후 통증에 대한 비교
최진우,김대우,인장혁,정홍수,전연수,이정아,김형건,전경배,주진덕 대한마취통증의학회 2011 Anesthesia and pain medicine Vol.6 No.2
Background: The aim of this study was to compare dexmedetomidine (DEX), which is a selective, short-acting, central α2-adrenergic agonist, with fentanyl in terms of the hemodynamic stability, achieving hypnosis and sedation, and the postoperative pain control at the PACU (postanesthetic care unit). Methods: In this double-blind study, 50 consecutive total laparoscopic hysterectomy patients scheduled for elective surgery were randomly assigned to receive either dexmedetomidine 1 μg/kg over 10 min followed by a 0.5 μg/kg/hr infusion (the DK group) or fentanyl 0.8−1.2 μg/kg over 1 min followed by a 0.2−0.6 μg/kg/hr infusion (the FK group) from the time of ending the operation after total hysterectomy to the time in the PACU. We evaluated the pain VAS scores, the modified OAA/S scores, the BIS, the vital signs,the respiratory variables (SpO2, RR and EtCO2) and the perioperative side effects to compare the efficacy of dexmedetomidine and fentanyl. Results: Compared with the fentanyl-ketorolac (FK) group, the modified OAA/S scores were significantly lower in the dexmedetomine-ketorolac (DK) group at 0, 5 and 10 min after arrival at the PACU (P < 0.05), whereas the pain VAS and BIS were not significantly different between the two groups. The blood pressure and heart rate in the DK group was significantly lower than that of the FK group at the PACU (P < 0.05). Conclusions: The DK group, at the doses used in this study, has a significant advantage over the FK group in terms of the postoperative hemodynamic stability at the PACU. There was no significant difference between the two groups for the postoperative pain control. (Anesth Pain Med 2011; 6: 125∼130)
최진우,서수홍,박현철,윤순종 한국복합신소재구조학회 2016 복합신소재구조학회논문집 Vol.7 No.3
Bridge inspection structures are the structure which is installed on the piers, abutments, and copings for the inspection and maintenance of substructure. In this study, the structural performance of the bridge inspection structures using aluminum members manufactured by extrusion process is evaluated. The bridge inspection structures can be installed regardless of the shape of concrete surface through the simple cutting process. The structural performance of bridge inspection structures is evaluated using FE analysis. Moreover, experimental studies are conducted for the estimation of the structural safety of the members for the design load.