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동영상 데이터 보호를 위한 공유 키 풀 기반의 DRM 시스템
김정재,박재표,전문석,Kim Jung-Jae,Park Jae-Pyo,Jun Moon-Seog 한국정보처리학회 2005 정보처리학회논문지 C : 정보통신,정보보안 Vol.12 No.2
본 논문에서는 동영상 데이터 암호화를 위해 비디오 데이터의 I-프레임 암호화 기법을 제안하고, 시스템 서버에서 암호화된 동영상 데이터를 클라이언트 시스템에서 사용자가 실행할 때 자동으로 사용자 인증과 데이터의 복호화를 수행할 수 있도록 하는 라이선스 에이전트와 동영상 데이터의 실행 시 공유 키 풀(shared key-pool)을 이용한 PKI(Public Key Infrastructure)기반의 사용자 인증과 동영상 데이터의 암호 및 복호화 시스템을 제안한다. 또한 대용량의 동영상 데이터 실행 시 복호화를 수행하면서 발생하는 많은 재생 지연시간을 줄이기 위해 이중 버퍼 제어를 구성하고 효율적인 버퍼 스케줄링을 이용한 실시간 복호화 방식을 제안한다. In this thesis, first, we propose I-frame encryption techniques of video data for video data itself encryption and propose license agent that processing user's certification and decryption in client system automatically when user execute encrypted video data in system server. License agent runs user's certification, encryption and decryption of video data based on PID(Public Key Infrastructure) using shared key-pool when execute of video data. Also, compose duplex buffer control and propose real time decryption method using efficient buffer scheduling to reduce much playing delay times that happen processing decryption when execute of videoa data of high-capacity.
시큐리티 에이전트를 이용한 사용자 인증과 DRM 보안시스템 설계
김정재,이경석,전문석,Kim Jung-Jae,Lee Kyung-Seog,Jun Moon-Seog 한국정보처리학회 2005 정보처리학회논문지 C : 정보통신,정보보안 Vol.12 No.7
본 논문에서는 기존의 암호화 방법보다 다양한 키를 생성하는 알고리즘을 제안하고, 키 생성 알고리즘을 통해 각각 생성된 대칭키를 서버에 저장하지 않는 기존의 시스템보다 보안성이 높은 DRM 암호화 시스템을 제안한다. 또한 클라이언트에서 복호화 할 때 각각의 키를 유추하여 복호화 하는 클라이언트 시큐리티 에이전트 시스템을 제안한다. 제안한 시스템을 설계하고 구현한 후 성능 평가를 위해 다양한 크기의 비디오 데이터 파일을 이용하여 실험을 수행하여 제안한 시스템이 기존 시스템에 비해 비디오 데이터 파일 재생 시 암호화 복호화 시간을 포함한 지연시간을 줄어 든 것을 검증하였다. This paper proposes the more various key generation algorithms than existing method and the DRM encryption system supporting the higher security than the existing systems which do not store a symmetric key made by the key generation algorithm in a server. Also, we propose a client security agent system which decrypts a data by analogized key. We designed and implemented the proposed system And, we tested the video data files with the various sizes to evaluate the performance of our system Our experiment results show that the delay time which includes an encryption and decryption time was significantly reduced through our proposed scheme.
고속 세틀링과 고정밀 위치 제어를 위한 모드 변경 제어 기법
김정재,최영만,김기현,권대갑,홍동표,Kim, Jung-Jae,Choi, Young-Man,Kim, Ki-Hyun,Gweon, Dae-Gab,Hong, Dong-Pyo 한국반도체디스플레이기술학회 2006 반도체디스플레이기술학회지 Vol.5 No.4
Recently, with rapid development of digital media like semiconductor and large flat panel display, the manufacturing equipment is required to have high precision over large travel range. Moreover it should have high product throughput. To achieve high product throughput, a controller should perform fast point-to-point motion and high precision positioning after settling in spite of external disturbances or residual vibrations. We proposed a new mode switching control algorithm with an application to dual stage for long range and high precision positioning. The proposed algorithm uses a proximate time-optimal servomechanism for the fast settling and a time-delay controller for the high precision positioning. Experimental results show that the proposed method enables smooth mode switching and improves the settling time and the precision accuracy after settling by over than 33% and 45%, respectively.
김정재 ( Jung Jae Kim ),정철영 ( Chul Young Jung ),오형근 ( Hyoung Keun Oh ),양병세 ( Byoung Se Yang ),장재석 ( Jae Suck Chang ) 대한골절학회 2007 대한골절학회지 Vol.20 No.2
목 적: 한국인에서 천장관절의 나사못 삽입과 관련한 상부 천골의 구조와 안전 구역의 해부를 평가하고자 하였다. 대상 및 방법: 골반부 3차원 컴퓨터 단층 촬영 (3D-CT)을 시행한 환자 100명을 대상으로 하였다. 16채널 CT장비로 촬영 후, 그림자 표면 표시 (shaded-surface display), 투과영상 (transparent image)과 재조합 영상 (reformat image)을 이용하여 분석하였다. 결 과: 제1천추에 대한 익상부의 경사도는 27.3˚,입구 영상각은 24.6˚, 제1천골 골단판의 경사도는 39.7˚였다. 제1천추경의 축은 32.5˚, 제2천추경의 축은 15.6˚ 전내방으로 향해 있었다. 제1천추경의 정측면상 단면적은 310.7㎟, 축에 대한 단면적은 384.8㎡였다. 제2천추경은 수평면상 단면적은 163.1㎟, 축에 대한 단면적은 188.4㎟였다. 익상부 전방 만입은 평균 5.1㎜ (최대 9.5)였다. 명백한 상부 천추 이형성증은 22%, 전이형은 32%였다. 결 론: 한국인의 상부 천골을 3D-CT를 이용하여 계측하였으며, 이형성증은 정도에 따라 54%의 빈도를 나타내어 이형성증을 고려한 천장관절 나사못 삽입과 관련한 해부학적 연구 및 술기가 필요할 것이다. Purpose: To evaluate upper sacral morphology and anatomy of safe zone related to iliosacral screw fixation in Korean. Materials and Methods: 100 patients performed pelvis 3D CT scan were evaluated. We used 16channel CT and analyzed reconstructed image (shaded-surface display, transparent image and reform at image). Results: The angle between superior aspect of S1 body and iliac cortical density is 27.3˚, between anterior cortical line of S1,2 body and horizontal plane 24.6˚, and between superior aspect of S1 body and horizontal plane is 39.7˚. The axis of S1, S2 pedicle is 32.5˚ and 15.6˚ toward anteroom edial. The area of S1 pedicle according to sagittal plane and sagittal-oblique axis is 310.7㎟ and 384.8㎟. Also, S2 pedicle area is increased 163.1㎟ to 188.4㎟. The average depth of ala indentation is 5.1 ㎜ and the maxim al value is 9.5 ㎜. Distinct upper sacral dysplasia is 22%, transitional form is 32%. Conclusion: We measured Korean upper sacrum with 3D-CT, found out dysplasia come up to 54%. Considering the frequency of dysplasia, the investigation of anatomy and technique is essential to sacroiliac screw insertion.
김정재(Jung Jae Kim),조동영(Dong Young Cho),서의교(Eui Kyo Seo) 대한두개저학회 2019 대한두개저학회지 Vol.14 No.2
Aneurysms arising from anterior spinal arteries are very rare. Rupture of an anterior spinal aneurysm is a rare cause of subarachnoid hemorrhage accounting for less than 1% of all cases reported in the literature. The management options include a surgical approach, endovascular embolization, or conservative treatment. Endovascular treatment with embolization using coils or liquid embolic agents is very difficult to reach to the aneurysm and to preserve parent artery. So the surgical approach is usually employed in origin of anterior spinal artery aneurysm. Far lateral approach is useful method to approach to the origin of anterior spinal artery and manage the aneurysm.
Leksell Gamma Knife Perfexion과 Model C의 치료계획 효용성 비교 : 임상연구
김정재 ( Jung Jae Kim ),김기홍 ( Gi Hong Kim ),박용구 ( Yong Gou Park ),장종희 ( Jong Hee Chang ) 대한뇌종양학회 대한신경종양학회 2014 Brain Tumor Research and Treatment Vol.2 No.1
Objective:The purpose of this study was to compare the dose planning between the Leksell Gamma Knife Perfexion (LGK PFX) and the Leksell Gamma Knife C (LGK C) using variable indices. Methods:A total of 100 cases, which were composed of 35 meningiomas, 20 vestibular schwannomas, 35 metastases, and 10 pituitary adenomas, were enrolled in this study. First, these cases were treated with the LGK PFX and then, were replanned with the LGK C. We compared these two models in terms of the number of shots, the percentage of coverage, the conformity index (CI), Paddick`s conformity index (PCI), the gradient index (GI), and the beam on time. Results:The LGK PFX completely outperformed the LGK C in terms of GI and the LGK PFX tended to have a longer beam on time than that of the LGK C. However, in patients with schwannomas, the LGK PFX outperformed the LGK C in terms of the CI, PCI, and GI, and in patients with pituitary adenomas, the LGK PFX outperformed the LGK C in terms of the percentage of coverage, PCI, and GI with statistical significance. Conclusion:The LGK PFX is an entirely redesigned radiosurgery unit accompanied by the development of software. The LGK PFX is supposed to achieve highly conformal dose prescription consisting of many isocenters with a reasonable treatment time.
임상 : Leksell Gamma Knife Perfexion과 Model C의 치료계획 효용성 비교 : 임상연구
김정재 ( Jung Jae Kim ),김기홍 ( Gi Hong Kim ),박용구 ( Yong Gou Park ),장종희 ( Jong Hee Chang ) 대한뇌종양학회 2012 대한뇌종양학회지 Vol.11 No.2
Objective:The purpose of this study was to compare the dose planning between the Leksell Gamma Knife Perfexion (LGK PFX) and the Leksell Gamma Knife C (LGK C) using variable indices. Methods:A total of 100 cases, which were composed of 35 meningiomas, 20 vestibular schwannomas, 35 metastases, and 10 pituitary adenomas, were enrolled in this study. First, these cases were treated with the LGK PFX and then, were re-planned with the LGK C. We compared these two models in terms of the number of shots, the percentage of coverage, the conformity index (CI), Paddick’s conformity index (PCI), the gradient index (GI), and the beam on time. Results:The LGK PFX completely outperformed the LGK C in terms of GI and the LGK PFX tended to have a longer beam on time than that of the LGK C. However, in patients with schwannomas, the LGK PFX outperformed the LGK C in terms of the CI, PCI, and GI, and in patients with pituitary adenomas, the LGK PFX outperformed the LGK C in terms of the percentage of coverage, PCI, and GI with statistical significance. Conclusion:The LGK PFX is an entirely redesigned radiosurgery unit accompanied by the development of software. The LGK PFX is supposed to achieve highly conformal dose prescription consisting of many isocenters with a reasonable treatment time.