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내측 안와벽 골절 처치: Transcaruncular approach
김현철,최주석,백진아,신효근,Kim, Hyun-Chul,Choi, Ju-Seok,Baek, Jin-A,Shin, Hyo-Keun 대한악안면성형재건외과학회 2007 Maxillofacial Plastic Reconstructive Surgery Vol.29 No.1
The occurrence of medial orbital wall fracture is isolated or combined with other facial bone fracture. There are many complications, for example, diplopia, enophthalmos, limitation of eye movement, visual activity depression and blindness. Because of these complications, the accurate diagnosis and treatment of medial orbital wall fracture is very important. We have reconstructed medial orbital walls with transcaruncular approach and obtained good results in patients with medial orbital wall fracture.
호이스트 및 크레인에 적용 가능한 안전후크와 X-jog 제품 설계 및 제작
나현호,김도정,최주석,오우준,박제웅,이천호,Na, Hyun-Ho,Kim, Do-Jung,Choi, Ju-Seok,Oh, Woo-Jun,Park, Jae-Woong,Lee, Chon-Ho 해양환경안전학회 2015 해양환경안전학회지 Vol.21 No.1
본 연구에서는 크레인 작업시 발생하는 재해발생 사례를 토대로 호이스트의 중량물 이탈 방지에 대한 연구를 수행하였으며, 안전고리의 결합으로 구성된 종래의 체결방식을 벗어나 구조물의 무게에 의한 자동 체결 및 결합 방식의 후크 및 특수목적을 가진 X-jog를 설계 및 제작하여 현장에 적용하고자 하였다. 주요 기구부의 3차원 상세설계와 구조해석을 통해 Safety Hook와 X-jog의 미소변형과 허용응력 이하의 구조안정성을 확인하였으며, 안전율은 일반적인 구조설계시 고려되는 안전율 1.2를 상회하는 평균 1.5를 나타냄을 확인하였다. 따라서, 본 연구에서의 Safety Hook와 X-jog는 구조물이 호이스트와 크레인에 부착되어 운용되어질시 구조적 안정성은 충분할 것으로 판단된다. In this study, we performed a study on prevention of the escape hoist heavy objects on the basis of the case of a disaster occurring during crane operations. A safety hook of the automatic fastening and coupling method by the conventional coupling method, the weight of the outside consisting of a combination of a safety ring structure was designed and manufactured. The main mechanism three-dimensional detail design and structural analysis confirmed the structure and stability of small strain than the allowable stress of the Safety Hook with X-jog through. Safety factor was confirmed to represent the average 1.5 to 1.2 higher than the safety factor to be considered in the general design structure. Therefore, Safety Hook and X-jog in the present study is to be operated upon structural stability is a structure attached to the hoist and crane are considered sufficient.
하악 제 3대구치 발거 후 예방적 항생제의 투여에 관한 연구
전희경(Hee-Kyoung Jeon),최주석(Ju-Seok Choi),김평수(Pyung-Soo Kim),안융(Yung Ahn),고승오(Seung-O Ko) 대한구강악안면외과학회 2005 대한구강악안면외과학회지 Vol.31 No.6
We evaluated the need for prophylactic postoperative oral antibiotic medication in extraction of asymptomatic impacted mandibular third molars. All patient didn’t show sign of pain, inflammation, swelling and trismus at the time of extraction. In the experimental group, oral antibiotic medication(Amoxicillin) was carried out for 5 days postoperatively. In the control group, the patients received no antibiotic medication. All groups didn’t use antibiotic irrigation solution. Rule of group composition randomized. The surgical technique was the same in all cases. Parameters that were evaluated were infection, pain, facial swelling, trismus. We could not find any significant difference between the experimental and control groups.(P<0.05) The results of our study show that post operative oral prophylactic antibiotic medication after the extraction of impacted mandibular third molars does not contribute to less infection, pain, facial swelling and increased mouth opening after surgery. Therefore we suggest that prophylactic postoperative oral antibiotic medication is not needed in extraction of asymptomatic impacted mandibular third molars.
GA를 이용한 레이저 용접 공정변수 최적화에 대한 연구
윤태종(Tae Jong Yun),오원빈(Won Bin Oh),이보람(Bo Ram Lee),이충우(Chong Woo Lee),나현호(Hyeon Ho Na),최주석(Ju Seok Choi),김일수(Ill Soo Kim) 대한기계학회 2021 大韓機械學會論文集A Vol.45 No.4
LNG(liguefied natural gas)는 여타의 화석연료에 비해 환경 부담이 작은 청정에너지의 장점 때문에 그 사용량은 세계적으로 증가하는 추세이며, 저장탱크, 파이프라인, 수송용 LNG 선박의 수요가 크게 증가하고 있다. 현재 LNG 탱크선의 30~40%가 곡선으로 이루어져 있는 LNG 탱크선에 대한 맞대기의 용접 한계를 극복하기 위한 용접부 형상 및 용접법의 변화가 필요하다. 본 연구에서는 맞대기 용접의 한계를 극복하고 고품질의 용접부 품질을 위해 필렛 형상의 레이저 용접을 수행하였으며, 필렛 용접부의 용입 형상에 대한 데이터를 활용하여 용접공정변수의 최적화를 최종목표로 하였다. 용접 공정변수의 최적화를 위해 유전자 알고리즘의 목적함수 및 제한함수를 선정하였다. 또한 GA를 이용하여 최적의 파이버 레이저 필렛 용접 공정변수를 도출하였으며, 알고리즘의 오차 분석을 통해 알고리즘의 신뢰성을 확보하였다. The use of liquified natural gas (LNG) is increasing globally because of its advantages as a clean source of energy with lower environmental burden compared to other fossil fuels. The demand for storage tanks, pipelines, and LNG transportation vessels is increasing significantly. About 30~40% of the current LNG tankers are curved and hence require butt welding. To overcome the limitations of butt welding, it is necessary to change the weld shape and welding method. In this study, fillet-shaped laser welding was performed to overcome the limitations of butt welding and to achieve high-quality welds. The ultimate goal was to optimize the welding process parameters by utilizing data on the penetration shape of the fillet weld. For optimization of welding process variables, the objective and limiting functions of the genetic algorithms were selected. In addition, the optimal fiber laser fillet welding process parameters were derived using the genetic algorithm, and the reliability of the algorithm was secured through error analysis of the algorithm.
GBO를 이용한 9% Ni Steel의 필렛 레이저 용접 공정 최적화
윤태종(Tae-Jong Yun),오원빈(Won-Bin Oh),이보람(Bo-Ram Lee),이충우(Chung-Woo Lee),나현호(Hyun-Ho Na),최주석(Ju-Seok Choi),김일수(Ill-Soo Kim) 대한용접·접합학회 2020 대한용접·접합학회지 Vol.38 No.5
Because more than 90% of the domestic manufacturing processes for the Liquefied Natural Gas (LNG) storage tanks rely on welding and processing technologies, the advancement of welding and processing technologies is directly connected to the productivity and therefore the advancement is critical to be competitive in the domestic shipbuilding industry. The welding technology using a laser light source is a more advanced technology than conventional arc welding in terms of workability, precision, and productivity. Although its application area is currently limited, this technology has been emerging as an important assembly tool in the manufacturing process of shipbuilding and offshore structures in the future. Because the LNG storage tank is a cryogenic structure, 9% nickel steel is widely used to manufacture the tank for both room temperature and low-temperature environments due to its excellent mechanical properties and fatigue strength. In terms of strength, 9% Ni steel is equivalent to 680 MPa-level high-tensile strength steel, and is usually used in applications where the operating temperature is below -150℃, such as LNG tanks with QT treatment. The 9% Ni steel has higher strength and better weldability than A5083-O aluminum alloy, has better impact toughness at cryogenic temperatures than SUS304L, and is economic. Therefore, 9% Ni steel is widely used to manufacture LNG tanks. Previous studies on the 9% Ni steel are based on butt welding, and research has been conducted according to the welding process. However, because 30-40% of LNG storage tanks are formed in a curved shape, research on the fillet welding process to overcome the limitations of butt welding has not been actively conducted to date. More specifically, research on the development of an algorithm for setting process variables, which is the core technology of fillet welding, needs to be conducted. Therefore, in this study, fiber laser welding, which is a fillet shape, is studied and performed using 9% Ni steel. The main objective of this study is to optimize the welding process variables by predicting weld properties. To derive the optimal process variables, the GBO algorithm was developed based on mathematical models. Finally, the developed algorithm showed an average error rate of 0.01831%, which ensures the high reliability of the optimal process variables.