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선청성 구순구개열 환자의 장기적인 교정 치료 및 음성언어학적 고찰
홍지숙,김윤지,황용인,김대성,박양호,Hong, Ji-Suk,Kim, Yoon-Ji,Hwang, Yong-In,Kim, Dae-Sung,Park, Yang-Ho 대한구순구개열학회 2009 대한구순구개열학회지 Vol.12 No.1
Orthodontic treatment planning of cleft lip and palate requires consideration of the characteristic features, growth pattern and functional disorders related to cleft lip and palate patients. Tissue deficiencies and constriction of the scar tissue in surgically treated cleft lip and palate results in disturbance of maxillary growth and deficiency of midfacial region with anterior and posterior crossbite. These patients often present congenital missing of teeth, supernumerary teeth, malformed teeth, or ectopic position of teeth, which should be treated by orthodontic treatment by expanding upper arch followed by fixed appliance. Proper use of retainer and continuous follow-up is needed to prevent relapse after orthodontic treatment has finished. Also we have to pay attention to correct speech disorder which is caused by the velopharyngeal insufficiency.
A study on the n-dimensional quadtree decomposition
이재영(Yi Jae Young),홍용인(Hong Yong-In),이천희(Yi Cheon Hee) 한국정보과학회 2009 한국정보과학회 학술발표논문집 Vol.36 No.1
We have examined the problem of the number of quad-tree blocks that an n-dimensional rectangle will be decomposed into on the average. The contribution of this paper are both practical and theoretical. From the practical point of view, the number of quadtree blocks of a decomposition is important, because it determines the number of nodes that a main-memory based quadtree will require; the number of entries in a linear quadtree that will be required ; also, the number of prices that a range query will be decomposed into which will be proportional to the response time for this query.