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대퇴골 경부 골절후에 생긴 지연유합 및 대퇴골두의 무혈성 골괴사의 치험예 : Phemister씨 수술 방법으로 치료한 일예
강상원,김성환,이수영 최신의학사 1974 最新醫學 Vol.17 No.10
The bone-grafting procedure for aseptic necrosis with or without union of the fractured femur neck indicates that this procedure has retained its usefulness as a conservative method. It does not disturb the basic anatomical fetures and allows the fracture to heal in most instances. A case of avascular necrosis of femoral head with ununited fracture of femur neck which was treated with Phemister technique is reported.
G.723.1 기반 비트율 scalable 음성 코덱 개발
강상원,이강은,박동원,이준석,Kang Sangwon,Lee Kangeun,Park Dongwon,Lee Joonseok 한국음향학회 2005 韓國音響學會誌 Vol.24 No.6
본 논문에서는 ITU-T 표준으로 채택된 G.723.1을 기본 계층으로 하고 G.723.1의 합성 에러 신호를 추가적인 부호화 과정을 통하여 부호화하는 비트율 scalable 코덱을 제안하였다. 그리고 제안된 scalable 음성 코덱을 ITU-T 표준 음질 측정 소프트웨어인 P.862 (PESQ)를 이용하여 성능 분석을 하였다. 제안된 비트율 scalable 코덱을 적용함으로써 G.723.1 5.3kbps와 개선 계층 6.7kbps가 함께 동작할 경우 G.723.1 5.3kbps 보다 MOS값이 0.372 향상되었으며, G.723.1 6.3kbps와 개선 계층 5.7kbps가 함께 동작할 경우 G.723.1 6.3kbps 보다 0.267 향상되었다. In this Paper. we present a bitrate scalable speech codec which uses an ITU-T G.723.1 as the baseline coder and encodes the synthesis error signal in an enhancement coder. ITU-T P.862 (PESQ) is used to evaluate the Performance of the bitrate scalable coder. Experiments show that 6.7kbps enhancement layer based on G.723.1 5.3kbps produces the increase of 0.39 in MOS and 5.7kbps enhancement layer based on G.723.1 6.3kbps Produces the increase of 0.267 in MOS.
상악 골절단 및 급속구개확장(SARME)을 이용한 술전 치성보상의 해소와 악교정 치험 2례 : REPORT OF 2 CASES
강상원,김명래,김기환,김한석,김채두 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.4
This is to review the surgically assisted rapid maxillary expansion followed by orthodontic treatment for malocclusion with maxillary narrow-arch. Two patients who presented with narrow-arch maloccluson and transverse maxillary deficiency underwent a Lefort I osteotomy extending to the zygomatico-maxillary but-trees and splitting of the midpalates. Orthopedic expansion was initiated with one complete rotation 0.8㎜ of the expansion screw on the day, and followed by two quarter-turn 0.4㎜ each day thereafter untill the arch expanded to preplanned level. Changes of the mid-incisal gap space. intermolar width. incisal inclination, TMJ symptoms and reapse tendency were examined periodically. After the surgico-orthodontic leveling and alignment. pre-planned orthognathic surgeries (maxillary & mandibular osteotomies) were rendered to correct the maxillofacial deformites. Results:Intermolar width (IMW) was increased to 13㎜ within 20 days and the gap between to cen-tral incisors was declined to5-7^。. There were neither complaints nor signs of TMJ disorders during treatment. The amount of relapse was less than 0.5㎜ in a year. Therefore, the surgically assisted rapid palatal expansion(SARME) can be a pre-orthodontic option to gain the interdental space in narrow-arch malocclusion with crowding and to reduce the labial inclination of upper incisors without extraction of premolars.
Design of a Variable Rate Algorithm for G.729
강상원,정우성,김재원,최송인 에스케이텔레콤 (주) 1998 Telecommunications Review Vol.8 No.3
Recently, 8kbps CS-ACELP coder of G.729 is standardized by ITU-T SG15 and it has been reported that the speech quality of G.729 is better than or equal to that of 32kbps ADPCM(G.726). However G.729 is the fixed rate speech coder, and it does not consider the property of voice activity in mutual conversation. If we use the voice activity, we can reduce the average bit rate in half without any degradations of the speech quality. In this paper, we propose an efficient variable rate algorithm for G.729. The variable rate algorithm consists of two main subjects, the rate determination algorithm and the design of sub rate coders. For the robust VAD algorithm, we combine the energy-thresholding method, the phonetic segmentation method by integration of various feature parameters obtained through the analysis procedure, and the variable hangover period method. Through the analysis of noise features, the 1kbps sub rate coder is designed for coding the background noise signal. Also, we design the 4kbps sub rate coder for the unvoiced parts. The performance of the variable rate algorithm is evaluated by the comparison of speech quality and average bit rate with G.729. Subjective quality test is also done by MOS test. Conclusively, it is verified that the proposed variable rate CS-ACELP coder produces the same speech quality as G.729, at the average bit rate of 4.4kbps.