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선 스펙트럼 쌍 파라메타의 효율적인 부호화를 위한 예측 3분리 다단계 벡터양자화 기법
임상현(Sang-Hyun Im),조정래(Jung-Rae Jo),이상운(Sang-Un Lee),유재성(Jae-Sung Ryu),장익성(Ik-Sung Jang),이기희(Gi-Hee Lee),임인칠(In-Chil Lim) 한국정보과학회 1994 한국정보과학회 학술발표논문집 Vol.21 No.2A
본 논문에서는 음성 스펙트럼 정보를 효율적으로 부호화할 수 있는 벡터양자화기 구조를 제안한다. 제안한 구조는 벡터 양자기의 단점인 탐색 계산요구량을 줄이기 위하여 분리 구조와 다단계 구조를 결합시키고 선형예측부호기 (LPC: Linear Predictive Coding) 계수에서 변환된 선 스펙트럼 쌍 (LSP: Line Spectrum Pair) 파라메타의 분포 특성을 효율적으로 이용할 수 있는 예측 구조를 갖는다. 제안한 구조의 부호책 설계방식으로 M-탐색(M-search) 공동 최적화 알고리듬을 적용하고, 왜곡 측정지준이 WMSE(Weighed Mean Squared Error)일 때 다단계 벡터 양자기 구조의 각 단계의 분할에 대한 중앙값 결정 방법을 제시한다.
유성열(Seong-Ryoul Ryoo),조정래(Jung-Rae Jo),김철주(Chul-Ju Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In present, a cooling technology that use heat pipe worldwide is applied in various form usually such as CPU and GPU cooler in computer, power semiconductor cooling etc. as well as electronic component cooling in the aerospace industry. But there are not much applied an instance of loop heat pipes (LHPs) that mainly done by Maidanik et al., except the aerospace industry. It is seemed the reason that is complicated to design and manufacture technology of LHP, and were not secured by operation reiablity, stability and economical efficiency. Specially, it is difficult to achieve technologically that manufactures the evaporator and sintered wick inside. In order to present basis technology about design and manufacture of LHP applied to cool down power conversion semiconductors, this research examined heat transfer limitations and tested operating performance.
등간격 병진스프링으로 지지되는 단순곡선보의 고유진동수해석
조정래,이용운,윤한익 동의대학교 산업기술개발연구소 2000 産業技術硏究誌 Vol.14 No.-
The transfer matrix method is used to study the influence of the translational spring support on the transverse vibration of the simple curved beam. The translational spring supports are constituted by the middle point and the nine points at regular interval on the curved beam. The influence of the translational spring constants on the natural frequency of the simple curved beam is very much at 1st and 3rd mode and the natural frequency is augmented as increasing of the translational spring constants. Since the amplitude of the curved beam is small at high mode, the translational spring constant has a little influence on the transverse vibration of the simple curved beam. The simple curved beam supported elastically at middle point has high frequency than that supported elastically at nine points at regular interval. If the translational spring constant supporting the simple curved beam become very large, and then since the elastic support is similar to the rigid support, the transverse natural frequencies increase very much at the each mode of the simple curved beam.