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김승범,송근웅,김승호,황정선 한국항공우주학회 2011 한국항공우주학회 학술발표회 논문집 Vol.2011 No.11
헬리콥터 꼬리로터 블레이드는 허브, 조종으로부터 회전력과 피치조종력을 전달받아 헬리콥터 요(yaw) 우 축 제어를 위한 추력을 발생시키며, 꼬리로터 허브는 회전에 의한 원심력과 공기력을 감당하고 조종은 비행조종계통에서 구동기를 통해 전달받은 조종력을 이용하여 탄성체 베어링 조립체를 통해 피치각을 제어함으로써 주로터에 의한 토크 상쇄 및 헬리콥터 방향제어에 필요한 꼬리로터 추력을 제어한다. 이러한 헬리콥터 꼬리로터 시스템은 과도한 진동 및 불안정성을 갖지 않도록 동적안정성을 설계 초기부터 고려하고 지상성능시험을 통해 로터안정성을 확인하고 회전시 로터의 동적특성을 파악해야 한다. 본 논문에서는 고흥 항공 센터(KARI) 꼬리로터 훨타워 시험설비를 이용한 꼬리로터 동적안정성 시험에 대해 기술하였다. The helicopter tail rotor system generates the thrust for yaw axis control of the helicopter with the torque and pitch control force transferred from the tail rotor hub/control. The ground whirl test shall be performed to dynamic stability test of tail rotor blade and hub/control according to the airworthiness requirement. Dynamic stability test is performed to rotor dynamic characteristics and should be checked rotor stability at hovering flight. This paper presents the dynamic stability test results of helicopter tail rotor system.
김승범,김재민,이형중,백광흠,김충현,오석전,이승환,Kim, Sung Bum,Kim, Jae Min,Yi, Hyeong Joong,Bak, Koang Hum,Kim, Choong Hyun,Oh, Suck Jun,Lee, Seoung Hwan 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.9
Objectives : At the closure of the transsphenoidal approach(TSA), the proper sellar floor reconstruction plays an important role in preventing postoperative complications. The septal cartilage, perpendicular plate of nasal septum, and the sphenoid sinus bone are usually used to repair the sellar floor as a bone splint. The authors evaluate the usefulness of a silicone plate as a substitute for bone splint to close a defect of the sellar floor. Materials and Methods : A silicone plate was used to repair the sellar floor in 7 patients with sellar lesions which included four pituitary adenomas, two Rathke's cleft cysts and one metastatic tumor. Among seven cases, five cases underwent a standard TSAs and two received a extended TSAs. The trajectories of the approach were sublabial in four cases and endonasal routes in three cases. The silicone plate for implantation was cut to a size of slightly larger than that of bone window and inserted with a three-pronged fork, and then adjusted precisely. Results : In six patients, there were no complications which related to sellar floor reconstruction. A postoperative cerebrospinal fluid(CSF) rhinorrhea was observed in one patient with pituitary macroadenoma. Conclusions : From the authors' experience, the advantages of the silicone plate are its simplicity of molding to fit any size of sellar floor defects, and easy detection of previously created bone window at reoperation.
아이돌산업 이해를 위한 한류 아이돌 유형에 관한 연구: 시스템사고 관점에서의 구조 분석
김승범,신호상 한국시스템다이내믹스학회 2018 한국시스템다이내믹스 연구 Vol.19 No.2
This study finds a way to understand Korean wave by concentrating on K-pop and idols like BTS. There are few researchs that have studied about why K-pop is loved. It is a reason why study this topic. The results are as follows. First, fans, idols, agents, and media should co-work each other. Idols want strong fandom to success, because fandom is the most powerful and effectful factor to make idols success. However, success does not only come from focusing on fandom, but also co-work. Second, K-pop should consider how they make people to be fans and help them to support K-pop stars. Last, this study suggests that some of reasons which make K-pop industry to a step backwards. The conclusion provides the K-pop should find the proper ways to solve the problems above and suggests a way - CLD model to understand K-pop idols.