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액와접근법을 이용한 무기하 내시경적 갑상선 절제술: 634예에 대한 수술 결과
강상욱,정종주,윤지섭<SUP>1<,SUP>,성태연,이승철,이용상,남기현,장항석,정웅윤,박정수,Sang-Wook Kang,Jong Ju Jeong,Ji-Sup Yoon,<SUP>1<,SUP>,Tae Yon Sung,Seung Chul Lee,Yong Sang Lee,Kee-Hyun Nam,Hang Seok Chang,Woong Youn Chung,and Ch 대한갑상선-내분비외과학회 2008 The Koreran journal of Endocrine Surgery Vol.8 No.1
강상욱,권오민,최형민,곽영제,Kang, Sang-Wook,Kwon, O-Min,Choi, Hyung-Min,Kwark, Young-Je 한국섬유공학회 2008 한국섬유공학회지 Vol.45 No.6
Nanofibers of phenylsilsesquiazanes (SSQZ), as a precursor of inorganic silicon nitride nanoweb, was prepared using the electrospinning process. The SSQZ was prepared by ammonolysis of phenyl trichlorosilane and condensation of the resulting aminosilanes. The molecular weight of resulting SSQZ increased with initial concentration of phenyl trichlorosilane, reaching plateau above 20wt% of the silane. When the SSQZ was electrospun alone, it did not form fiber even with 20wt% concentration of SSQZ. However, it was possible to prepare fibers by adding poly(ethylene oxide) (PEO) as a viscosity enhancer. The diameter the of electro spun fibers was modified by the total polymer content and the content of PEO. The best result was obtained when the total concentration of the polymer was in the range of 15 to 20 wt% while the SSQZ/PEO ratio was 95/5.
고정단 평판의 전 주파수 대역 고유치 추출이 가능한 NDIF법 개발: 제1부(이론 정립 및 검증)
강상욱(Sang Wook Kang) 한국소음진동공학회 2023 한국소음진동공학회 논문집 Vol.33 No.6
In the eigenvalue analysis of clamped plates, the original NDIF method cannot extract low-order eigenvalues and eigenmodes when the number of nodes is increased. Recently, the author developed a practical method to solve this problem for eigenvalue analysis of membranes and acoustic cavities. In the study, the practical method is applied and extended to clamped plates, and the exact solution obtained for a verification example of a clamped circular plate shows that the proposed method can extract all the eigenvalues across the entire frequency range irrespective of the number of nodes. In addition, the eigenvalues obtained using the proposed method are compared with those using the original NDIF method, exact solution, and finite element method (FEM;ANSYS). Evidently, the proposed method, which uses only 30 nodes, provides more accurate results than the FEM, which uses 1835 nodes for extracting eigenvalues and eigenmodes.
무차원 동영향 함수법을 이용한 임의 형상 멤브레인의 효율적인 고차 고유치 해석
강상욱(Sang Wook Kang) 대한기계학회 2022 大韓機械學會論文集A Vol.46 No.1
무차원 동영향 함수법(NDIF법)은 유한요소법과 경계요소법 보다 이론적 간결함 덕분에 정확한 고유치 해석 결과를 제공하는 장점을 가지고 있다. 그러나 고차 고유치 추출을 위해 노드의 수를 증가할 경우, 저차의 고유치가 추출이 되지 않는 단점이 존재한다. 최근의 연구에서 이러한 문제점이 일부 해결하였으나, 저차의 고유치를 추출하기 위해 추가적인 고유치 해석을 해야 되는 비효율성과 저차 고유치의 정밀도 저하 문제가 여전히 존재한다. 본 논문에서는 이러한 비효율성과 문제점을 해결하기 위한 개선된 무차원 동영향 함수법(NDIF법)이 제안되고, 검증 예제를 통해 제안된 방법의 타당성과 정확성이 확인된다. The non-dimensional dynamic influence function (NDIF) method exhibits the advantage of providing more accurate eigenvalue analysis results than the finite element method and the boundary element method, owing to its theoretical simplicity. However, it exhibits the disadvantage of not extracting the lower-order eigenvalues when increasing the number of nodes for the higher-order eigenvalue extraction. Although the author"s recent work has addressed this problem, there remains an insufficiency. Hence, an additional eigenvalue analysis is required to extract the lower-order eigenvalues that can lead to reduced accuracy of the eigenvalues. In this paper, an improved NDIF method is proposed to overcome this inefficiency. In addition, the validity and accuracy of the proposed method are confirmed using a verification example.
국제우주정거장에서 수행된 한국우주식품 관능평가 결과분석
강상욱(Sang-Wook Kang),최기혁(Gi-Hyuk Choi),이소연(So-Yeon Yi),김성수(Sung-Soo Kim),송범석(Beom-Seok Song),김재훈(Jae-Hun Kim),이주운(Ju-Woon Lee) 한국항공우주학회 2009 韓國航空宇宙學會誌 Vol.37 No.8
본 논문에서는 한국우주인이 국제우주정거장에서 수행한 한국우주식품 10품목에 관한 관능평가결과를 분석하였다. 개인의 기호도 차이 때문에 관능평가 점수가 낮은 품목도 있었지만 대부분 높은 점수를 받았다. 해외우주인도 한국우주식품에 관하여 높은 평가를 하고 있어 향후 한국우주식품의 국제화 가능성도 확인할 수 있었다. 향후 유인우주탐사를 대비하여 한국우주식품의 품목 다양화와 우주에서 편리하게 사용할 수 있는 기능성을 갖춘 한국우주식품용 포장지 개발이 필요하다. We analyzed the result of sensory evaluation for the 10 items of Korean Space Foods performed by Korean astronaut in ISS. Although there were low score items because of the individual preference difference, Most items received the high score. Also, we can confirm the possibility of the internationalization of the Korean Space Foods because international astronauts gave the high valuation. we should develop the various space foods and food package which are easy to use in space for the human exploration in the future.
갑상선암에 대한 로봇 보조 내시경적 갑상선 절제술; 100예에 대한 초기 경험
강상욱 ( Sang-wook Kang ),정종주 ( Jong Ju Jeong ),윤지섭 ( Ji-sup Yun ),성태연 ( Tae Yon Sung ),이승철 ( Seung Chul Lee ),이용상 ( Yong Sang Lee ),남기현 ( Kee-hyun Nam ),장항석 ( Hang Seok Chang ),정웅윤 ( Woong Youn Chung ) 대한갑상선학회 2008 International Journal of Thyroidology Vol.1 No.2
Background and Objectives: Various surgical procedures have been performed using surgical robot in recent years and most reports proved that application of robotic technology for surgery is technically feasible and safe. The aim of this study is to introduce our technique of robot-assisted endoscopic thyroid surgery and demonstrate its utility in the surgical management of thyroid cancer. Materials and Methods: From October 4<sup>th</sup> 2007 through March 14<sup>th</sup> 2008, 100 patients with papillary thyroid cancer underwent robot-assisted endoscopic surgeries using a gasless trans-axillary approach. This novel robotic surgical approach allowed adequate endoscopic access for thyroid surgeries. All the procedures were completed successfully using the da Vinci surgical system (Intuitive Surgical, Sunnyvale, California, USA). We used four robotic arms with this system; a 12 mm telescope and three 5 mm instruments. The 3-dimensional magnified visualization obtained by the dual-channel endoscope and tremor-free instruments controlled by robot system helped surgeon do sharp and precise endoscopic dissection. Results: We performed 84 less-than total and 16 total thyroidectomies with ipsilateral central compartment node dissection. Mean operation times was 136.5 min. (range 79∼267 min.) in which the actual time for thyroidectomy with lymphadenectomy (console time) was 60.0 min. (range 25∼157 min). The average number of lymph nodes resected was 5.3 (range 1 to 28). There was no serious complication. Most patients could go home within 3 days after surgery. Conclusion: Our technique of robotic-assisted endoscopic thyroid surgery using a gasless trans-axillary approach is feasible, safe and promising for the selected patients with thyroid cancer. We suggest application of robotic technology for endsocopic thyroid surgeries could overcome the limitations of conventional endoscopic surgeries in the surgical management of thyroid cancer.