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후방십자인대 대치형 슬관절 전치환술시 경골 후방 경사각 감소가 신전간격에 미치는 영향
김종헌 ( Jongheon Kim ) 대한슬관절학회 2009 대한슬관절학회지 Vol.21 No.4
Purpose: To evaluate the effect of decreasing tibial slope on extension gap during posterior stabilized total knee arthroplasty. Materials and Methods: One hundred and ten cases of total knee arthroplasty which were done with posterior stabilized implant were included and we divided those into Group I; having flexion contracture (n=35) and Group II; no flexion contracture (n=75), and from each group, we evaluated the relationship between degree of decreased angle of tibial slope and frequency of additional resection of distal femur which was done for compensating insufficient extension gap during total knee arthroplasty and compared frequencies of additional distal femoral resections between 2 parts having more and less degree of decreased angle of tibial slope. Results: In Group I and II, tibial slope decrease were 8.7˚, 7.4˚ (p=0.145) and frequencies of additional resection were 51.4%, 24% (p=0.005) in average. Comparing 2 parts having more and less degree of decreased angle of tibial slope in each Group, frequencies of additional resection were 44.4%, 58.8% (p=0.505) and 13.2%, 35.1% (p=0.032). Conclusion: During posterior stabilized total knee arthroplasty, especially having no preoperative flexion contracture, decreasing tibial slope can be considered as a factor influencing on extension gap by removing greater anterior bone and the estimation of predictable tibial slope decrease through preoperative radiologic findings can be helpful in creating equal flexion and extension gaps.
상호작용 VR 기술을 이용한 가상 캠퍼스 안내 시스템 구현
김종남(Jongnam Kim),나길항(Kilhang Na),김종헌(Jongheon Kim),김경업(Gyeongeop Kim),정영기(Youngkee Jung) 한국HCI학회 2008 한국HCI학회 학술대회 Vol.2008 No.2
가상현실 시스템에서 체험자가 현실과 같은 몰입을 느끼기 위해서는 하드웨어를 통한 가상환경 구축과 체험자와의 상호작용이 중요하다. 본 논문에서는 위치 주적 시스템(Motion Tracking System), Wand(3D Mouse) 및 HoloPoint 등 다양한 VR 인터페이스를 통해 체험자의 움직임, 위치, 동작을 인식하고 대형 멀티 디스플레이 시스템을 통해 입체영상을 제공하는 가상환경을 구축하고 체험자가 원하는 정보를 상호작용(Interaction)으로 제공할 수 있는 가상 캠퍼스 안내 시스템을 구현하고자 한다. 가상 캠퍼스 구축은 캠퍼스의 지형, 건물 및 구조물들의 정확한 형상을 얻기 위해 3D 스캐너를 이용하였고 획득된 데이터는 일련의 과정들을 거쳐 3D 모델로 생성된다. 이렇게 생성된 모델을 재배치 및 최적화하기 위해 모델링 소프트웨어를 사용하였다. 구축된 가상 캠퍼스와 위치 추적 시스템 및 Wand의 연동을 위해 VR 프로그래밍 하여 체험자의 움직임 및 동작을 콘텐츠에 그대로 적용시켰다. 여기에 키오스크 유형의 HoloPoint를 이용하여 체험자의 손동작으로 상호작용하는 안내시스템도 구축하였다. 상호작용 가능한 가상 캠퍼스 안내 시스템은 가상현실 시스템 구축에 대한 또 다른 방법과 활용 예를 제시함으로써 가상전시관 및 가상체험관 등에 활용될 수 있을 것으로 기대된다.
스타트업 최고경영자의 네트워킹행동이 경영성과에 미치는 영향에 관한 질적 연구
김현 ( Hyun Kim ),김종헌 ( Jongheon Kim ),문재승 ( Jaeseung Moon ) KNU기업경영연구소 2020 기업경영리뷰 Vol.11 No.4
The purpose of this study is to explore, by using a qualitative research method, how the networking behavior of a top manager of a start-up company can influence its performance - particularly depending on its network behavior with the government (in order to obtain its support); for exchange of social as well as financial capital, top managers of start-ups look to active networking with the necessary government entities. Therefore, by conducting in-depth interviews with startup top managers and the related executives, the topic was assessed. In order to establish a frame for confirming the hypothesis of this research, a semi-structured questionnaire was constructed, along with selecting suitable candidates for the interview. A total of 3 startups and 7 respondents were sampled, and based on the Grounded Theoretical research method, categories, and concepts from the response contents through the open coding process were selected. The following contents from the research were confirmed. First, all of the respondents experienced difficulties in the early stages of the start-up, due to insufficient funds; second, majority of top managers of start-ups survived the “Death Valley”due to government support; third, various management results were possible due to government support. Lastly, it was confirmed that reciprocity of on-going relations with the government and the start-up’s top management, definitely ensures fruitful outcomes for the start-up’s present and future performance - in both social as well as capital equity.