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스테레오 영상의 변이 정보를 이용한 머리 회전 각도 추정에 관한 연구
김택훈 ( Taek-hoon Kim ),장종환 ( Jongwhan Jang ) 한국정보처리학회 2005 한국정보처리학회 학술대회논문집 Vol.12 No.1
본 논문은 스테레오 카메라를 통해 얻은 변이 정보를 이용하여, 3 차원으로 머리의 회전 각도를 추정하는 방법을 제안한다. 머리 회전에 의한 주시 방향은 사람이 관심을 가지는 방향이므로 이동을 추정하는 것에 비해 많은 중요성을 갖는다. 본 논문에서는 얼굴 영역 내의 여러 특징점들 중 3개의 특징점들을 포함하는 여러 평면(Plane)이 머리가 이동하더라도, 그 평면들 사이의 각은 변하지 않으므로, 회전 각도 추정에 영향을 주지 않는 점을 이용하여 회전 각도를 추정하였다. 또한, 기존 논문이 카메라 보정을 통해 3 차원 위치를 측정하지만, 제안하는 방법은 변이 공간에서 회전 각도를 추정하기 때문에 카메라 보정 과정이 필요하지 않다. 변이 정보를 얻기 위한 스테레오 장비는 평행카메라 모델로 가정하며, 얼굴 내의 특징점은 KLT(Kanade-Lucas-Tomasi) 특징 추적 알고리즘을 이용하였다. 실험결과는 기준 영상에 대하여 추정된 3 차원 각도를 나타낸다.
오종기,김택훈,이화영,Oh, Jong-Kee,Kim, Taek-Hoon,Lee, Hwa-Yeong 한국재료학회 1993 한국재료학회지 Vol.3 No.2
금속동-흑연복합분말을 제조하기 위하여 염화동을 흑연주위에서 수소환원시킴으로써 흑연표면에 금속동을 석출시키는 새로운 방법으로 흑연-금속동 복합재료를 제조하고자 하였으며, 이를 위해 325 mesh이하의 KISH및 천연흑연을 모재로 하여 350-50$0^{\circ}C$의 환원온도에서 염화동을 환원시키는 실험을 실시하였다. 금속동의 분산도는 환원온도가 낮을수록 양호한 것으로 나타났으며, 금속동의 분산도를 높이기 위해서는 가능한한 환원온도를 낮게하는 것이 유리한 것으로 나타났다. Abstract It has been attempted to make the copper-graphite composites by deposition of copper on the surface of graphite through the hydrogen reduction of copper chlorides. Both KISH and natural graphites of less than 325 mesh were used as substrates and the hydrogen reduction also was conducted in the range of 350-50$0^{\circ}C$. The distribution of copper on the surface of graphite was found to increase with the decrease of reduction temperature. In addition. the partial pressure of hydrogen played an important role in the overall rate of reduction which was substantially dominated by the chemical reaction on the surface of each particle. It was concluded that the reduction temperature should be maintained as low as possible to accomplish the well distribution of copper in the composites.
임신 중기 임신중절에서의 Misoprostol 의 질내 투여와 Prostaglandin E2 질정의 질내 투여의 비교
김종인(Jong In Kim),김택훈(Taek Hoon Kim) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.2
Objective: To compsre the efficiency, success rate, and abortion time of applications of intravaginal misoprostol versus prostaglandin E2 vaginal tablet for mid-trimester pregnancy termination Subjects and methods: Eighty four patients between 17-29 weeks of gestation with medical, obstetric, or genetic reasons far termination were randomized to receive either 50 ug tablets of misoprostol placed in the posterior vaginal fornix or prostaglandin E2 3mg in tables placed into the endocervix. Results: Among eighty four patients recruited, fourty five patients received misoprostol and thirty nine patients received prostaglandin E2 vaginal tablets. The average interval hom start of induction to vaginal delivery was 13.35 +- 3.34 hours in misoprostol poup and 19.14 +- 10.64 hours in the prostaglandin E2 group. The success rate of complete termination within 12 and 24 hours in misopr-ostol group were 57.7%, 93.3%, respectively, while in prostaglandin E2 group were 20.5%, 82.1% repectively. Oxytocin augumentation was 6.7% in misoprostol group and 17.9% in the prostaglardin E2 group. No serious complication occumd. Conclusion: Intracervicovaginal misoprostol appears to be acceptably safe and effective agents for second trimester pregnancy termination. The abortion time is less in misoprostol group than those in the prostaglandin E2 group. Misoprostol has the advantage of being expensive, easily stored and readily available. We used 50 ug tablets of misoprostol every four hours. But, we suspect that the regimen of 100ug misopostol inserted intracervico-vaginally every eight hours will beis the proper and optimal method for pregnancy termination.
서재성(Jae Seong Seo),김택훈(Taek Hoon Kim) 한국사회체육학회 2010 한국사회체육학회지 Vol.0 No.40
The purpose of this study lies in complementing the validation process of Physical Activity Questionnaire for Young Children developed in English-speaking world and actually apply to the Korean young children in terms of conception and statistics. 307 parents of 4, 5, 6 years of living in Seoul were selected as participants for the research. Translation and back-translation process, Descriptive Statistics of item analyzed result, krutosis and skewness were all stable. Corrected Item- Total Correlation and item-delete Conbach`s α were estimated low compared to Total Item Conbach`s α. Test-retest of every items appeared to be over .86 in its reliability. item 7 of factor 1 carried person-fit index according to the Confirmatory factor analysis(CFI, GFI: .93~98; RMR: .034: RMSEA; .020). The difference in groups according to sex appeared to be higher in physical activity standard to the male children than female children.