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409L페라이트계스테인리스강CO2레이저용접부의미세조직과경도
공종판 ( Jong Pan Kong ),박태준 ( Tae Jun Park ),나혜성 ( Hye Sung Na ),엄상호 ( Sang Ho Uhm ),김정길 ( Jeong Kim Kim ),우인수 ( In Su Woo ),이종섭 ( Jong Sub Lee ),강정윤 ( Chung Yun Kang ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.4
The microstructure and hardness of CO2 laser welds were investigated in the Ti-stabilized ferritic stainless steel 409L. The observed specimen was welded in a fully penetrated condition in which the power was 5 kW and the welding speed 5 m/min. The grain structure near the bond line of the laser welds was produced by epitaxial growth. The grain size was the largest in the fusion zone, and HAZ showed nearly the same grain size as that of the base metal. The HAZ microstructure consisted of subgrains and precipitates that were less than l00 nm in size and that were located along the subgrain boundaries. On the other hand, the hardness was the highest in the fusion zone due to the large amount of small precipitates present. These were composed of TiN, Ti(C,N) and TiO2+Ti(C,N). The hardness decreased continuously from the fusion zone of the base metal. The HAZ hardness was slightly greater than that of the base metal due to the existence of subgrains and precipitates in the subgrain boundary. (Received January 13, 2010)
Forearm Muscle Activity Patterns during Open Thyroidectomy Using 8-Channel Surface Electromyography
Yun Suk Choi,Hyun-jin Joo,Jong-Hyuk Ahn,Hyoun-Joong Kong,Jin Wook Yi 대한갑상선-내분비외과학회 2021 The Koreran journal of Endocrine Surgery Vol.21 No.1
Purpose: Quantitative analysis of forearm muscle movements during actual surgery has not yet been performed. The aim of this study was to evaluate forearm muscle activity patterns during open thyroid lobectomy using 8-channel surface electromyography, specifically Myo gesture-control arm bands. Methods: We developed a raw-signal recording program based on output from a Myo device. Eight Myo electrodes were allocated to the following adjacent forearm muscles: pronator teres (PT), brachioradialis (BR), extensor carpi radialis & brevis (ECR), extensor digitorum (ED), extensor carpi ulnaris (ECU), flexor carpi ulnaris (FCU), palmaris longus (PL), and flexor carpi radialis (FCR). EMG signals were measured from the time of skin incision to the end of thyroid lobectomy. Root mean square (RMS) value was used to indicate muscle activity during surgery. Results: Total of 10 thyroid lobectomies (5 right and 5 left lobectomies) were performed with Myo devices. The right arm muscles had higher RMS values than the left arm muscles (mean RMS 632.427 versus 367.170, P<0.001). In the right arm, PT, BR, ECR, FCU, PL and FCR showed higher mean RMS values, which means that the right arm made a greater variety of movements than the left arm. Only ED and ECU showed higher mean RMS values in the left arm, which means that the left arm muscles acted to counteract the motion of the right arm. Conclusion: We are the first to quantitatively evaluate forearm muscle activity patterns during thyroid lobectomy. More detailed research will be needed to apply our results in other surgical fields.
박준영 ( Park Jun-young ),신준식 ( Shin Jun-sik ),원종빈 ( Won Jongbin ),박종웅 ( Park Jong-woong ),장윤 ( Jang Yun ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
케이블 교량은 다수의 케이블이 하중을 지지하는 구조로 설계되어 케이블의 장력을 모니터링하는 것이 매우 중요하다. 케이블의 손상을 감지하는 최신 기법을 찾고자 최근 IPC-SHM 2020 경진대회에서는 2006년부터 2011년까지 10차례에 걸쳐 수집된 14개의 케이블별 장력 데이터를 이용해 2011년도에 실제로 손상이 발견된 케이블을 추정하는 챌린지가 열렸다. 본 연구에서는 위 대회에서 주어진 케이블별 장력 데이터를 이용해 2011년 실제로 발생한 손상 케이블을 탐지하는 기법을 제안하였다. 시계열 분석(Time Series Analysis), 시계열 클러스터링(Time Series Clustering), 딥러닝(Deep Learning)의 3가지 접근법을 적용하였으며, 각각의 방법에서 찾은 손상 케이블을 토대로 최종적으로 손상된 케이블을 감지할 수 있었으며 이러한 결과로 Challenge에서 Second Prize를 차지하였다.
Risk Factors of Microscopic Invasion in Early Gastric Cancer
Choi, Jong-Ho,Suh, Yun-Suhk,Park, Shin-Hoo,Kong, Seong-Ho,Lee, Hyuk-Joon,Kim, Woo Ho,Yang, Han-Kwang The Korean Gastric Cancer Association 2017 Journal of gastric cancer Vol.17 No.4
Purpose: This study aimed to evaluate the clinical significance of microscopic invasion to determine the adequate resection margin in early gastric cancer (EGC). Materials and Methods: A retrospective review was performed that included patients who underwent gastrectomy for clinical early gastric cancer (cEGC) at Seoul National University Hospital between January 2007 and December 2010. After subtracting the microscopic resection margin from the gross resection margin for each proximal or distal resection margin, microscopic invasion was represented by the larger value. Microscopic invasion and its risk factors were analyzed according to the clinicopathologic characteristics. Results: In total, 861 patients were enrolled in the study. Microscopic invasion of cEGC was $6.0{\pm}12.8mm$, and the proportion of patients with microscopic invasion ${\geq}0mm$ was 78.4%. In the risk group, tumor location, pT stage, and differentiation did not significantly discriminate the presence of microscopic invasion. The microscopic invasion of EGC-IIb was $13.9{\pm}16.8mm$, which was significantly greater than that of EGC-I. No linear correlation was observed between the overall tumor size and microscopic invasion (R=0.030). The independent risk factors for microscopic invasion ${\geq}20mm$ were EGC-IIb vs. EGC-I/IIa/IIc/III (odds ratio [OR], 3.103; 95% confidence interval [CI], 1.533-6.282; P=0.002) and male vs. female sex (OR, 1.655; 95% CI, 1.012-2.705; P=0.045). Conclusions: Male sex and EGC-IIb were independent risk factors for microscopic invasion ${\geq}20mm$. Examination of intraoperative frozen sections is highly recommended to avoid resection margin involvement, especially in cases of EGC-IIb.
Effect of Indium Mole Fraction on the Diode Characteristics of ZnO:In/p-Si(111) Heterojunctions
Lee, Jong Hoon,Jang, Bo Ra,Lee, Ju Young,Kim, Hong Seung,Jang, Nak Won,Kong, Bo Hyun,Cho, Hyung Koun,Bae, Ki Ryeol,Lee, Won Jae,Yun, Young IOP Publishing 2011 Japanese journal of applied physics Vol.50 No.r3