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Top-down nanofabrication approaches toward single-digit-nanometer scale structures
오동교,Heonyeong Jeong,Joohoon Kim,김예슬,김인기,Jong G. Ok,노준석 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.3
Sub-10 nm nanostructures have received broad interest for their intriguing nanooptical phenomena, such as extreme field localization and enhancement, quantum tunneling effect, and strong coupling. The range of cutting-edge applications based on single-digitnanometer scale structures has expanded with the development of nanofabrication technologies. However, challenges still remain in overcoming fabrication limits, such as scalability, controllability, and reproducibility for further practical applications of the sub-10 nm nanostructures. In this review, we discuss the recent advances in top-down nanofabrication methods towards single-digit-nanometer-sized structures. The well-known examples include electron beam lithography (EBL), focused ion beam (FIB) milling or lithography, atomic layer deposition (ALD), and other unconventional techniques to obtain sub-10 nm nanostructures or nanogaps. We discuss state-of-the-art applications for sub-10 nm nanophotonics such as optical trapping or sensing devices, imaging devices, and electronic devices.
V-shaped Liver Retraction during a Laparoscopic Gastrectomy for Gastric Cancer
오동교,Hoon Hur,Jun Young Kim,한상욱,조용관 대한위암학회 2010 Journal of gastric cancer Vol.10 No.3
Purpose: The aim of this study was to evaluate the effectiveness of our retraction method for achieving a good operative field for the adequate lymph node dissection during laparoscopic gastrectomy in view of short term surgical outcome. Materials and Methods: This study prospectively enrolled 19 patients who underwent laparoscopic gastrectomy for early gastric cancer. The procedure was simply performed by putting the laparoscopic sigle suture in the phrenoesophageal ligament, and then the string was pulling and tying over the sternum. Surgical outcomes of these patients were evaluated. Results: Under V-shaped liver retraction, the mean operating time and mean number of retrieved lymph nodes was 166.3 minute and 31.37, respectively. And the results were satisfactory compared to open or conventional laparoscopic gastric surgery. Conclusions: V-shaped liver retraction requires no extra port or assistant’s hands, and prevents additional injury to any intra-abdominal organ. And this method can easily, efficiently and safely enable to achieve a good operative field for the lymph node dissection near the lesser curvature of the stomach.
궤도차량용 토크 컨버터 펌프의 형상 정밀도 측정을 통한 성능예측에 관한 연구
오동교(Dong-Kyo Oh),김성용(Sung-Yong Kim),김주영(Joo-Young Kim),백진욱(Jin-Uk Baek),류성기(Sung-Ki Lyu) 한국기계가공학회 2024 한국기계가공학회지 Vol.23 No.7
To accurately predict the performance of the torque converter, the shape accuracy of the main component, the pump, was measured using a 3D laser scanning coordinate measuring machine (CMM). Products that met the conditions were tested with dedicated test equipment to determine the speed ratio representing the general performance of the torque converter. The torque increase ratio and capacity coefficient were obtained and compared with the one-dimensional model-predicted performance to calculate the performance characteristics. The calculation results confirmed that if the shape of the pump satisfied the casting precision range of the production drawing, the performance characteristics were within the predicted range.