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타워크레인 텔레스코핑 작업의 풍속 및 하중에 대한 구조 안전성 연구
정성룡,이도근,백신원,신상연,Jung, Sung-Lyoung,Lee, Do-Geun,Paik, Shinwon,Shin, Sang-Yeon 한국안전학회 2021 한국안전학회지 Vol.36 No.1
This study analyses the load imbalance of the tower crane used in telescoping work for structural safety, owing to the difference in wind speed and balance weight position. This is because wind speed and position of the balance weight have a significant impact on the structural stresses of a tower crane during telescoping work. Therefore, structural analysis was performed on the 290HC model, which is often used at construction sites and has only one cylinder installed. Moreover, two models were classified to determine the load acting on the connecting part of the telescopic cage to slewing platform and the cylinder. Five types of balance weight positions were applied at regular intervals from jibs; moreover, four types of wind load criteria were differently applied. Hence, the telescopic cage columns were destroyed at all balance weight positions at a wind speed of 30 m/s and only at certain locations at a wind speed of 20 m/s. Furthermore, failures occurred for cylinders, torsional, and bending at wind speeds of 30 m/s and 20 m/s, load imbalances above the allowable thresholds considering the safety factor. In addition, the load imbalance in the telescoping work also varied depending on the position of the balance weights. The results of these studies have validated that the current standards of adjusting the appropriate position of the balance weights on the jib are completely valid, with the telescoping work to be executed only at wind speeds of less than equal to 10 m/s.
정성룡(Sung-Ryong Chung) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
In this study. as an efficient method for measuring the frictional energy on the contact patch of an automobile tires, paint wear method is described. It comprises applying a single layer of paint to tread surface by spraying, running the tires on a vehicle for a short distance, assessing the wear rate by measuring the intensities of reflecting lights at various locations, and comparing them with original values. This method permits the wear rate to be quantitatively evaluated with a very high resolution under well-controlled test conditions.<br/> A typical example is provided to show wear distribution across shoulder to shoulder of passenger car tires. Tread wear patterns produced by different toe-in angle have been analyzed through the range of tread wear patterns. Application of this method makes studies of the effects of wheel alignment and tire on uneven wear possible.<br/>
간장 및 담도 : 담도회충증의 임상 중상과 내시경적 치료 - 담낭염 및 췌장염 -
김부성 ( Boo Sung Kim ),정진우 ( Jin Wu Jeong ),유혜신 ( Hye Sin Yu ),조상덕 ( Sang Deok Cho ),정성룡 ( Sung Ryung Chung ),유경진 ( Kyung Jin Yoo ) 대한소화기학회 1986 대한소화기학회지 Vol.18 No.1
N/A Ascaris lumbricoides infection is usually asymptomatic, but when invasion of the ascaris to the human biliary tract is a prominent medical and surgical problems. Here we have two case reports of common bile duct ascariasis, which clinical manifestations were different each other, one is acute pancreatitis form and the other is acute cholangitis form. The management of biliary obstruction caused by ascaris lumbricoides has usually been surgical, but this report describes the endoscopic removal of the ascaris located in the common bile duct.
何首烏(하수오) 물추출물이 LPS로 유발된 RAW 264.7 Cells의 염증인자에 미치는 영향
정성룡 ( Seong Yong Jeong ),한효상 ( Hyo Sang Han ),이영종 ( Young Jong Lee ) 대한본초학회 2013 大韓本草學會誌 Vol.28 No.6
Objectives: The purpose of this study was to investigate the effects of Polygoni Multiflori Radix Water Extract (PM) on the production of inflammatory mediators in RAW 264.7 mouse macrophages induced by lipopolysaccharide (LPS). Method : We examined effect of PM Extract on the cell viability of RAW 264.7 cells. Futhermore, we investigated anti-inflammatory effect of PM Extract by the production of proinflammatory cytokines such as NO, intracellular calcium, interleukin(IL)-1α, IL-3, IL-1β, IL-6, interferon inducible protein-10(IP-10), keratinocyte-derived chemokine(KC) and vascular endothelial growth factor(VEGF). Result : No significant changes have been found in the mouse macrophge cell viability by the PM Extract at the concentration of 25, 50, 100 and 200㎍/mL. The water extract of PM significantly inhibited the production of NO and intracellular calcium in the LPS-induced macrophages at the concentration of 25, 50, 100 and 200㎍ /mL. The water extract of PM significantly inhibited the production of IL-1α, IL-β, IL-3, IP-10, KC, VEGF in the LPS-induced macrophages at the concentration of 50, 100, and 200㎍/mL; IL-6 at the concentration of 100 and 200 ㎍/mL ; and IL-17 at 200㎍/mL. Conclusion : The water extract of PM significantly inhibited the production of NO, intracellular calcium, IL-1α, IL-3, IL-β, IP-10, KC, VEGF at the concentration of 50 ㎍/mL or higher in the LPS-induced macrophages with no changes in the cell viability of them. These results suggest that water extract of Polygoni Multiflori Radix has anti-inflammatory effect regulating the production of proinflammatory cytokines in the LPS-induced macrophages.
Diffprivlib를 이용한 차분프라이버시 적용 학습모델의 분류성능 측정
성민경(Sung Min Kyoung),이진규(Lee Jin Kyu),정성룡(Jeong Seong Ryong),김윤중(Kim Yun Joong),김동례(Kim Dong Rye) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
데이터는 중요성은 나날이 커지고 있으며, 이용 범위 및 분야도 점차 다양해지고 있다. 그러나 데이터에 포함된 개인정보로 인해 유통 및 활용에 큰 제약을 받고 있다. 개인정보 처리 문제를 해결하기 위한 기법 중 하나로 차분프라이버시 기술이 있으며, De-facto 표준으로 널리 사용되고 있다. 본 논문에서는 차분프라이버시가 적용된 학습모델의 분류성능을 실험을 통해 측정하여 차분프라이버시 기술의 유용성을 분석한다.
신상연,백신원,정성룡,Shin, Sang-Yeon,Paik, Sinwon,Jung, Sung-Lyoung 한국안전학회 2021 한국안전학회지 Vol.36 No.2
Specialty contractor facilities, which involve a combination of welding and commissioning, face a high risk of serious accidents such as fire, explosion, and suffocation associated with welding work, nitrogen, and argon use. In such facilities, the organizational safety culture has considerable impact on the frequency of accidents. In this study, a safety culture evaluation was conducted on specialty contractors. NOSACQ-50, a standardized survey method on safety culture, was selected as an assessment tool to evaluate the safety culture in specialized construction companies that could not afford to invest heavily in safety. The self-administered questionnaire survey was conducted with 201 workers of four construction companies and the results were analyzed. It was found that in companies with low safety culture, the occurrence of irrationality was 66.0%, while in companies with high safety culture, the occurrence of irrationality was 42.6%. Thus, the difference in the occurrence of irrationality by safety culture was statistically significant. The difference in safety culture level according to the experience of occurrence of irrationality was also significant. It was also found that the higher the belief in safety management authorization, safety responsibilities of managers, worker safety priorities, and safety system effects, the lower the probability of irrationality.
문맥압 항진증, 식도정맥류 및 유미복수를 동반한 미만성 결절성 간증식 1 예 보고
정규원,정환국,손현식,정성룡,이용관,이광식 대한내과학회 1986 대한내과학회지 Vol.30 No.3
Nodular regenerative hyperplasia of the liver is uncommonly reported and poorly defined clinico- pathological entity. It is distinguished from cirrhosis by the absence of true fibrous septal formation. Its diagnosis is very difficult without an open biopsy. Several clinical associations have been noted, but the etiology remains obscure. When the liver is diffusely involved, this condition may give rise to portal hypertension, sometimes leading to massive bleeding from gastroesophageal varices. We repory a case of diffuse nodular regenerative hyperplasia causing portal hypertension, esophageal varices and chylous ascites, which was diagnosed by laparoscopic examination and needle aspiration biopsy.