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Natural Orifice Translumenal Endoscopic Surgery: Current Status and Future Technical Development
송용남,홍대희,김윤진,신충수 한국정밀공학회 2013 International Journal of Precision Engineering and Vol.14 No.5
The technology behind NOTES, an evolutionary endoscopic surgery conducted through the natural orifices of the patient to completely eliminate external post-operative scars, has been substantially improved in the last decade. The scarless nature of NOTES is believed to decrease the chance of wound infections and incision hernias, improve recovery times and increase the cosmetic satisfaction of patients. Although various animal and human studies have extended our understanding of physiology and the requirements of NOTES procedures, current NOTES technology is still too rudimentary to be applied to various clinical settings due to the technical and instrumental limitations. Recently, numerous efforts have been made in the development of proper surgical instruments for NOTES procedures. A secure closure method for luminal perforation is one of the most actively investigated areas,and several promising devices have already been introduced. A virtual navigation system for flexible endoscopic instruments would be beneficial for surgical reliability and safety issues by assisting the narrow endoscopic visual field. Various retraction devices are also necessary to enable complex endoscopic surgical maneuvers. Unfortunately, engineers have only taken supportive roles in the history of NOTES development, though engineering experience and knowledge are crucial for the development of complicated and miniaturized endoscopic devices. The active involvement of engineers in NOTES technology is required for the realization of NOTES in routine clinical practice
송용남 ( Song Yong-nam ),양승현 ( Yang Seung-hyeon ),홍성욱 ( Hong Seong-uk ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.2
이 연구는 고인성복합체를 이용한 조적조 내진보강시스템 개발을 위하여 조적부재 실험체를 제작하고, 휨 거동 평가를 통한 내진보강 가능성을 확인하고자 하였다. 고인성복합체를 이용한 적벽돌 조적부재와 무보강 조적부재를 대상으로 휨강도 시험을 수행하였다. 고인성복합체를 이용한 적벽돌 조적부재가 무보강 조적부재보다 휨내력이 7.3배 우수한 결과를 나타내었다. 고인성복합체가 기존 조적구조 건축물의 내진보강시스템에 유효하다는 것을 확인하였다.
강민석 ( Kang Min-seok ),송용남 ( Song Yong-nam ),양석원 ( Yang Seock-won ),양승현 ( Yang Seung-hyeon ),홍성욱 ( Hong Seong-uk ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
본 연구는 고인성복합체를 이용한 내진보강시스템을 개발하기 위하여 조적부재 실험체를 제작하여 전단시험 수행을 통한 내진보강 가능성을 검증하고자 한다. 고인성복합체로 보강한 조적부재의 내진보강 성능을 평가하기 위한 실험체를 제작하여 전단시험을 수행하였다. 고인성복합체에 유리섬유를 보강한 내진보강시스템보다 고인성복합체에 용접철망을 보강한 내진보강시스템이 보강능력이 우수하였다. 기존 노후화된 조적구조 건축물에 고인성복합체를 활용한 조적구조 내진보강 가능성을 확인하였다.
Quantitative Measurements of Muscle Degeneration in Volumetric Shoulder Muscle Models
홍기택,이도관,신충수,최정아,송용남 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.10
Qualitative image-based Goutallier grading system is popular to examine fatty degeneration of shoulder muscles, but may not provide consistent results to describe the true status of the muscles due to observer-dependent variabilities and limitations of using one crosssectional image. We calculated occupation ratio (ratio between the supraspinatus muscle and the fossa), single-image and volumetric fat contents to quantitatively describe the degree of muscle atrophy and fatty infiltration in the supraspinatus muscle and compared them with conventional Goutallier grading system. We retrospectively examined the MR images of 33 symptomatic patients. Significant differences were found in the occupation ratio (p < 0.01, Kruskall-Wallis H test) and volumetric fat contents (p < 0.05) among different grading groups while no differences were found in single-image fat contents. Correlations of the occupation ratio with singleimage and volumetric fat contents were found to be moderate suggesting that muscle atrophy and fatty infiltration might be independent factors. Quantitative measurements of occupation ratio and threshold-based volumetric fat contents may be useful to provide consistent information describing both atrophy and fatty infiltration of the supraspinatus muscle which are important predictors of degenerative muscles.