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음성 특성을 이용한 G.711 패킷 손실 은닉 알고리즘의 성능개선
한승호,김진술,이현우,류원,한민수,Han Seung-Ho,Kim Jin-Sul,Lee Hyun-Woo,Ryu Won,Hahn Min-Soo 대한음성학회 2006 말소리 Vol.57 No.-
Because a packet loss brings about degradation of speech quality, VoIP speech coders have PLC (Packet Loss Concealment) mechanism. G.711, which is a mandatory VoIP speech coder, also has the PLC algorithm based on pitch period replication. However, it is not robust to burst losses. Thus, we propose two methods to improve the performance of the original PLC algorithm in G.711. One adaptively utilizes voiced/unvoiced information of adjacent good frames regarding to the current lost frame. The other is based on adaptive gain control according to energy variation across the frames. We evaluate the performance of the proposed PLC algorithm by measuring a PESQ value under different random and burst packet loss simulating conditions. It is shown from the experiments that the performance of the proposed PLC algorithm outperforms that of PLC employed in ITU-T Recommendation G.711.
블룸 연속주조에 있어서 경계밀착좌표계를 이용한 용강유동과 열전달의 연결해석
윤종규,소찬영,이중의,한승호,석윤종 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.1
A 2-D coupled analysis of heat transfer and fluid flow was conducted in continuously cast bloom. Latent heat of fusion was considered by modifying the heat capacity/temperature relation, which is so called the effective heat capacity method. To consider the curved type geometry, boundary-fitted coordinate(BFC) system was employed. Water cooling in the mold was simulated by considering the known heat flux and the secondary cooling by considering air cooling and air-mist spray. In this study, the fluid flow and the temperature profile in the continuous casting system of bloom were simulated with the variation of casting speed, tundish superheat. Thus, the effects of casting variables on the distribution of surface temperature, shell thickness, metallurgical length were predicted.