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박희승,정향숙,김용기,정희민 大韓小兒齒科學會 1990 大韓小兒齒科學會誌 Vol.17 No.2
The term “Mesiodens” refers to a supernumerary tooth that is present in the midline of the anterior maxilla. Supernumerary tooth results from aberrations in the initiation or proliferation period of dental developmental stage. The crown often has a conical shape, and its familial incidence has been reported in several instances. The author has observed 71 cases of supernumerary tooth occured at premaxilla between central incisors. Among the total tooth number of 86,70 were impacted, and 16 were erupted. In most cases(96.5%), supernumerary tooth located on the palatal side of adjacent teeth. Surgical and/or orthodontic treatment were performed in 53 cases, 21 cases, were left untreated for delayed surgical intervention.
수종의 구강위생 방법에 따른 인공 초기 우식법랑질의 재석회화에 관한 비교 생체연구
정희민,김용기 大韓小兒齒科學會 1991 大韓小兒齒科學會誌 Vol.18 No.1
With a view to evaluating the effect og topical fluoride application in vivo,enamel slabs taken from artificial carious lesion produced by Hydroxuethylcellulose system were mounted in acrylic mandibular removable appliances and worn by 4 male subjects for two weeks.Control subjects brushed 4 times a day with non-fluoridated dentifrice.Experimental subjects also brushed 4 time a day but wash MFP dentifrice(G2),plus 0.05% NaF mouthrinsing(G3) or with MFP dentifrice plus 0.05% NaF mouthrinsing.After performing different oral hygiene regimen,surface morphology and histological profile in depth along with Ca,P content in layers were studies using SEM,polarizing light microscope,EPMA,EDX and WDX. The results were as follows: 1.Remineralized lesion in all groups showed smoother and less porous surface than original carious enamel lesion. 2.Under polarzing light microscope,artificial carious lesion showed typical subsurface demineralization; The lesion body showed positive birefringence,and the inner sound enamel and intact surface layer showed negative birefringence.When compared to the original lesions,remineralized artificial carious lesion showed decresed lesion depth with increased thickness of intact surface.This features were more distinct in the case of topical fluoride application group(group 2,3,4).The body of remineralized lesion in group 1,2 revealed continuous pattern,whereas group 3 and 4 showed interruped charicter. 3.From Ca & P profile analyzed by WDX,maximum mineral loss of most lesions was showen to be detected at around the area of 80㎛ from surface roughly.The intergroup rank of remineralizing rate besed on WDX data in descending order was group 4,3,2 and 1.
Structure and electrochemical properties of CNT-supported Li-Ti-O anode material for Li-ion battery
Freddy Baltazar Iniguez,정희민,Ahmed Yousef Mohamed,말도나도노잘레스폴,최환준,정순기,JONG BAE PARK,김양수,조덕용 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-
We investigated the structural and electrochemical properties of Li-Ti-O (LTO) and carbon nanotube(CNT)-added LTO for anode material in secondary Li-ion batteries using various techniques. The studyfocused on elucidating the effects of the microstructural evolution in LTO and the CNT addition on batteryfunctionality. For all the tested compositions of LTO ([Li]/[Ti] = 0.9, 1.0 and 1.22), the system is fully oxidizedto comprise a mixed-phase having Li4+2dTi5O12+d (d’s are approximately 0.14, 0.25, and 0.65, respectively)and Li2TiO3 structures. The results of the half-cell tests show a decrease in charge/dischargecapacity with increasing [Li]/[Ti] ratio, and the detailed structural and chemical analyses unequivocallyreveal that the such degradation in the electrochemical property originates mainly from the increaseof Li content (d). Meanwhile, after adding CNT, the Li capacity becomes greatly increased while theLTO composition and the redox kinetics do not change significantly. The origin of the improved specificcapacity is associated with the formation of micron-sized structures at the surface of the LTO particles. Thereby we demonstrate that surface engineering via the CNT addition is a promising way to improvethe performance of the LTO-based anode material.
신서영(Seoyoung Shin),윤서현(Seohyeon Yoon),정희민(Heemin Jung),김준식(Junsik Kim),김규헌(Kyuheon Kim) 한국방송·미디어공학회 2018 한국방송공학회 학술발표대회 논문집 Vol.2018 No.6
현재 기술의 블렌딩 된 동영상을 재생하는 과정에서 사용하는 기법은 각각의 이미지들을 스티칭 후 동영상을 재생하므로 이전 프레임의 경계를 고려하지 않는다. 이러한 과정에서 움직임이 동일한 경계 부분을 정확하게 파악하여 연결하지 못하는 오류가 발생하여 자연스러운 영상 재생이 불가능하다. 이에 대한 해결책으로 각 영상의 frame 을 추출하여 경계의 가중치를 비교한 후 차이가 클 경우 새로운 경계를 생성하여 적용하는 과정을 고안했다. 상기의 과정을 통해 블렌딩 된 동영상의 초기 오류가 크게 감소하였다. 본 논문에서는 해당 기술에 대한 구체적인 방안을 제시하여 다양한 동영상을 효과적으로 개선하여 오류를 최소화한 동영상을 얻을 수 있도록 하였다.