실시간 동영상 암호화 기법을 적용한 화상회의 시스템 구축

최우진,김형균,오무송 한국정보통신학회 2002 한국정보통신학회논문지 Vol.6 No.6

By emphasize and enhance security in encryption of same viewdata in this research, constructed video conference system that apply real time video encryption techniques that confidentiality and integrity aspect are emphasized than video conference system that depend on existent user certification techniques. Sender's image transmits Vernam's encryption process to listener by packet. Listener can display image through image's decipher process and uncompress after unite receiving transmited image. This time, solved transmission speed delay problem by video's real time encryption using Vernam's algorithm that encryption and the decipher speed are fast. Simplification problem of Vernam algorithm wished to solve Session Key that use security Key that is used encipherment and decipher in channel between Client and Server using RSA algorithm. 본 연구에서는 동영상정보의 암호화에 중점을 두어 보안성을 향상함으로써, 기존의 사용자인증 기법에 의존한 화상회의 시스템에 비해 기밀성과 무결성 측면이 강조된 실시간 동영상 암호화 기법을 적용한 화상회의 시스템을 구축하였다 송신자의 영상은 Vernam의 암호화 과정을 패킷 단위로 수신자에게 전송한다. 수신자는 전송되어진 영상을 받아서 합친 후 영상의 복호화과정과 압축 복원을 통해 영상을 출력할 수 있다. 이때, 암호화 및 복호화속도가 빠른 Vernam의 알고리즘을 사용함으로써 동영상의 실시간 암호화에 따른 전송속도지연 문제를 해결하였다. Vernam 알고리즘의 단순성 문제는 암호화 및 복호화에 사용되는 보안Key를Client와 Server간의 채널에서 이용할 Session Key를 RSA 알고리즘을 이용함으로써 해결하고자 하였다.

퇴행성 요추부 질환에 대한 치료에서 척추 고정술과 동반된 인접부 극돌기간 기구 삽입술의 유용성에 대한 예비 보고

최우진,장상근,김동천 대한척추신경외과학회 2009 Neurospine Vol.6 No.3

Objective: Posterior lumbar or lumbosacral spinal fusion in degenerative lumbar disease has the problems of adjacent level disease as well as surgical complications. An interspinous device used for dynamic stabilization can also be applied to the adjacent segment for spinal fusion to reduce the severity of these problems. The authors reviewed the adjacent interspinous stabilization using an interspinous spacer (CoflexTM paradigm spine, Germany) combined with posterior lumbar or lumbosacral spinal fusion in degenerative lumbar disease. Method: From January 2007 to July 2008, ten patients with degenerative lumbar disease underwent posterior lumbar or lumbosacral spinal fusion with adjacent interspinous stabilization using CoflexTM. The indications for this type were adjacent segmental disc protrusion, adjacent segmental degenerative changes or high surgical risk groups, such as elderly patients or osteoporotic patients undergoing multiple leveled fusions. CoflexTM was inserted into the adjacent segmental interspinous space. The control group consisted of fifteen patients, who underwent posterior lumbar or lumbosacral spinal fusion without interspinous stabilization. The radiological parameters and clinical outcomes were compared. All patients were followed-up for more than twelve months. Results: The visual analogue scale (VAS) in both groups postoperatively and at the twelve month follow-up were improved. In the CoflexTM group, the postoperative and twelve month follow-up X-ray showed no significant change in posterior disc height, interpedicular height, segmental lordotic angle, flextion-extension angulation and translation and no significant segmental instability. The control group showed a higher level of segmental lordotic angle, translation and a lower posterior disc height, interpedicular height, flextion-extension angulation and three patients showed adjacent segmental instability. Conclusion: CoflexTM can be used to stabilize the adjacent segment of spinal fusion in degenerative lumbar disease and might be effective in preventing adjacent segmental degeneration. However, further study will be needed to confirm this observation. Objective: Posterior lumbar or lumbosacral spinal fusion in degenerative lumbar disease has the problems of adjacent level disease as well as surgical complications. An interspinous device used for dynamic stabilization can also be applied to the adjacent segment for spinal fusion to reduce the severity of these problems. The authors reviewed the adjacent interspinous stabilization using an interspinous spacer (CoflexTM paradigm spine, Germany) combined with posterior lumbar or lumbosacral spinal fusion in degenerative lumbar disease. Method: From January 2007 to July 2008, ten patients with degenerative lumbar disease underwent posterior lumbar or lumbosacral spinal fusion with adjacent interspinous stabilization using CoflexTM. The indications for this type were adjacent segmental disc protrusion, adjacent segmental degenerative changes or high surgical risk groups, such as elderly patients or osteoporotic patients undergoing multiple leveled fusions. CoflexTM was inserted into the adjacent segmental interspinous space. The control group consisted of fifteen patients, who underwent posterior lumbar or lumbosacral spinal fusion without interspinous stabilization. The radiological parameters and clinical outcomes were compared. All patients were followed-up for more than twelve months. Results: The visual analogue scale (VAS) in both groups postoperatively and at the twelve month follow-up were improved. In the CoflexTM group, the postoperative and twelve month follow-up X-ray showed no significant change in posterior disc height, interpedicular height, segmental lordotic angle, flextion-extension angulation and translation and no significant segmental instability. The control group showed a higher level of segmental lordotic angle, translation and a lower posterior disc height, interpedicular height, flextion-extension angulation and three patients showed adjacent segmental instability. Conclusion: CoflexTM can be used to stabilize the adjacent segment of spinal fusion in degenerative lumbar disease and might be effective in preventing adjacent segmental degeneration. However, further study will be needed to confirm this observation.

화학소재솔루션센터의 플라스틱 복합수지 디지털전환 기술 연구 현황과 향후 계획

최우진,조남정,박재성,김인,명진석,이재흥 한국공업화학회 2022 한국공업화학회 연구논문 초록집 Vol.2022 No.1

생산자책임재활용제도(EPR)와 폐플라스틱 재활용

최우진,Choe, U-Jin 한국자원재생재활용연합회 2003 재활용회보 Vol.1 No.-

척추질환에 따른 운동방법

최우진 대한운동사협회 2011 대한운동사협회 워크숍자료집 Vol.34 No.-

고령운전자의 승/하강 거동 Part 1: 특성 분석

최우진,사정신,최형연,Choi, W.J.,Sha, S.J.,Choi, H.Y. 대한의용생체공학회 2009 의공학회지 Vol.30 No.5

Due to the aging effect, older people have relatively weaker muscular performance, less range of motion in the joint articulation, and the lower sense of equilibrium than younger people. These factors attribute to their slow and clumsy ingress/egress motion. In order to analyze ingress/egress motion strategy of the elderly, healthy thirty 65 or more years old volunteers were recruited. The health condition of the each volunteer was verified by the medical checkup and also their physical capabilities were quantified by six fitness tests. Through the video analysis, older driver's ingress/egress motion strategies were classified and statistically investigated. For a comparison purpose, another thirty young volunteers also participated in the same test protocol and their ingress/egress motion strategies were also included in the statistical analysis.

소아와 성인의 급성 경막외 혈종에 대한 임상 비교

최우진,송시헌,고현송,염진영,김성호,김윤 대한신경외과학회 1997 Journal of Korean neurosurgical society Vol.26 No.3

녹색성장과 시멘트산업의 미래

최우진,Choe, U-Jin 한국시멘트협회 2010 시멘트 Vol.188 No.-

PMIPv4 기반 WiBro-HSDPA 이종망간 Seamless 핸드오버기술 개발

최우진,김성진,유흥렬,이성춘,Choe, U-Jin,Kim, Seong-Jin,Yu, Heung-Ryeol,Lee, Seong-Chun 한국통신학회 2009 정보와 통신 Vol.26 No.2

본 논문에서는 KT 인프라연구소에서 개발한 PMIPv4 기반 WiBro-HSDPA 이종망간 Seamless 핸드오버 기술을 소개한다. 개발된 핸드오버 기술은 WiBro-HSDPA 이종망간 Context 정보전달에 의한 빠른 핸드오버 절차와 네트워크 계층에서의 소프트핸드오버 기술을 접목하여 이종망간 핸드오버 시 패킷 손실이 없도록 설계 및 구현하으며, 상용 WCDMA/HSDPA와 WiBro 시스템으로 구성도니 KT-KTF 연동 테스트베드를 이용하여 검증하였다.

PMIPv 기반 WiBro-HSDPA 이종망간 Seamless 핸드오버기술 개발

최우진,김성진,유흥렬,이성춘 한국통신학회 2009 정보와 통신 Vol.26 No.2

본 논문에서는 KT 인프라연구소에서 개발한 PMIPv4 기반 WiBro-HSDPA 이종망간 Seamless 핸드오버 기술을 소개한다. 개발된 핸드오버 기술은 WiBro-HSDPA이종망간 Context 정보전달에 의한 빠른 핸드오버 절차와 네트워크 계층에서의 소프트핸드오버 기술을 접목하여 이종망간 핸드오버 시 패킷 손실이 없도록 설계 및 구현하으며, 상용 WCDMA/HSDPA와 WiBro 시스템으로 구성된 KT-KTF 연동 테스트베드를 이용하여 검증하였다.