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LMS 적응 알고리즘의 스텝크기의 적정 범위에 관한 연구
박영철,정창경,차균현 한국통신학회 1993 韓國通信學會論文誌 Vol.18 No.2
본 논문에서는 LMS 적응 알고리즘이 수렴하기 위한 스텝크기의 적정 범위를 등화기 계수의 양자화 오차와 초과 MSE를 고려하여 새로 제시하였으며 이의 타당상을 트랜스버설 등화기의 시뮬레이션을 통해 보았다. This paper presents a new optimal range of the step size to converge LMS adaptive algorithm considering quantization error of equalizer coefficient and excess MSE. And the simulation of transversal equalizer shows the propriety of it.
하악전돌증환자의 악교정수술후 안면측모 변화에 관한 두부방사선 계측학적 연구
이형식,박영철 대한치과교정학회 1987 대한치과교정학회지 Vol.17 No.2
The purpose of this study was to examine soft tissue and hardtissue changes following orthognathic surgery in patients with mandibular prognathism lateral cephalometric films were obtained immediate before surgery, 48 hours following surgery, and 6 months following surgery. 18 patients were selected (10 men, and 6 women)for this study, who had received orthognathic surgery. Statistical analysis for the each time interval differences were performed with the SPSS package. The results were as follows; *In the cases of mandibular sagittal split osteotomy 1. LI point was meved backward(average 7.55mm) 48 hours following surgery. 6 months later, it was returned forward. (average 1.1mm) Relapse rate was 14.6% 2. Pog was moved backward (average 8.3mm) 48 hours following surgery The ratio of horizontal change of soft tissue to hard tissue at pog is 0.95:1 *In the cases of maxillary Le-Fort I osteotomy & mandibular sagittal split osteotomy. 3. A point was moved forward (average 3.31mm) 48 hours following surgery. 6 Months later, it was returned backward(average 0.31) Relapse rate was 9.4% 4. 6 months later, the ratio of facial convexity angle change of soft tissue to hard tissue is 0.63:1
분말야금법을 이용한 TiNi기 형상기억 복합재료의 기계적특성에 관한 연구
박영철,윤두표,박민식,김광영 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.1
In this study, It is introduced that TiNi/Al-radical shape memory composite as one of new material that used shape memory alloy (SMA). It is a method to produce a better strength of composite by occuring compressive residual stress in matrix, using shape memory effect of TiNi fiber. This method os replaced of tensile residual stress happened by difference of coeffients of thermal expansion (CTE) between fiber and matrix, one of the significant faults of metal matrix composite (MMC). In this paper, shape memory composites are made by powder metallurgy. And then, an self-strengthening effect of the composites by shape memory effect above inverse transformation temperature A_f of TiNi alloy are discussed. Moreover, TiNiCo/Al composites is made by using TiNiCo alloy as fiber. And it is discussed about affection of Co in the shape memory composite. The results of the intelligent properties of TiNi/Al-radical shape memory composite, using SMA, by powder metallurgy are the tensile strength of TiNiCo wire is much higher than that of TiNi wire and the strength of TiNiCo/Al composite is generally higher than of TiNi/Al composite.