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      • KCI등재

        CBCT 및 3D CT를 활용한 상악 유구치 치근과 근관 형태

        김준희,김현태,신터전,현홍근,김영재,김정욱,장기택,송지수,Kim, Joon Hee,Kim, Hyuntae,Shin, Teo Jeon,Hyun, Hong-Keun,Kim, Young-Jae,Kim, Jung-Wook,Jang, Ki-Taeg,Song, Ji-Soo 대한소아치과학회 2021 大韓小兒齒科學會誌 Vol.48 No.4

        이 연구의 목적은 상악 유구치의 치근 및 근관의 형태학적 특성을 분석하는 것이다. 2006년 1월부터 2020년 4월까지 서울대학교 치과병원에서 CBCT 및 3D CT를 촬영한 3 - 7세 환자 총 268명(남자 175명, 여자 93명)이 연구에 포함되었으며, 치근 흡수와 치수병변이 없는 총 1002개의 상악 유구치의 치근과 근관 수를 분석하였다. 218개의 치아에 대해 치근과 근관의 형태, 이개각도, 치근과 근관의 길이 및 근관의 단면 형태를 분석하였다. 48개의 치아에 대해서는 Mimics 및 3-Matics software를 사용하여 치근 치수의 부피와 표면적, 치근-치수 비를 측정하였다. 절반 이상이 3개의 치근과 3개의 근관을 가지고 있었다. 좌우측 치아의 대칭성(Cohen's kappa coefficient)은 약 0.63이었다. 치근과 근관의 형태는 상악 제1유구치에서는 직선형이, 제2유구치에서는 곡선형이 많이 관찰되었다. 치근의 이개 정도, 치근과 근관의 길이는 상악 제1, 2유구치 모두 구개측 치근에서 가장 크게 나타났다. 근단부에서 근관의 단면 형태는 주로 ovoid 혹은 round형이었다. 치근 치수의 부피와 표면적, 치근-치수 비는 상악 제1,2유구치 모두 구개측 치근 치수에서 가장 크게 나타났다. The purpose of this study is to analyze morphological characteristics of maxillary primary molar's root and root canal. 268 children aged 3 - 7 years (175 boys, 93 girls) who had CBCT (152 children) and 3D CT (116 children) taken in Seoul National University Dental Hospital from January 2006 to April 2020 were included. The number of roots and root canals were analyzed in 1002 teeth without any root resorption or periapical pathologies. Curvature, angulation, length of root and root canal, as well as cross-sectional shapes of the root canal were analyzed in 218 teeth. By using Mimics and 3-Matics software, volume, surface area, and volume ratio of root canal was analyzed in 48 teeth. More than half of maxillary primary molars have 3 roots and 3 root canals. The degree of symmetry of root canal type was about 0.63 (Cohen's kappa coefficient). The most frequent shape of roots and canals was linear in 1<sup>st</sup> primary molars and curved in 2<sup>nd</sup> primary molars. Angulation, length of root and root canals was the largest on palatal roots. Most teeth showed ovoid or round shapes at apex. The largest root canal volume, surface area, volume ratio was found in the palatal roots.

      • SCOPUSKCI등재

        황에 저항성을 가지는 수성가스 전환반응 촉매의 연구 II. CoMo 촉매의 활성에 미치는 알칼리 금속염의 영향

        김준희,이호인,Kim, Joon Hee,Lee, Ho In 대한화학회 1998 대한화학회지 Vol.42 No.6

        황피독에 저항성을 가지는 수성가스 전환반응용 CoMo 계열 촉매에 알칼리금속염 첨가가 반응활성에 미치는 영향에 대하여 연구하였다. 알칼리금속염의 음이온과 양이온의 각각에 대한 영향을 알아보기 위하여 크게 두 경우로 나누어 촉매를 제조하였다. 그 하나는, 양이온을 K로 고정시키고 음이온을 변형시킨 경우로서, 반응활성의 변화는 BET 표면적의 변화로 설명되었다. 다른 한 경우는, 음이온을 $NO_3^-$로 고정시키고 알칼리금속 이온을 변형시킨 경우로서, Li가 첨가된 촉매의 활성이 가장 뛰어났으며 다른 양이온의 경우에는 서로 비슷한 낮은 활성을 보였다. 알칼리금속의 첨가량의 변화에 따른 BET 표면적의 변화와 반응활성의 변화가 같은 경향을 보였다. 알칼리금속염의 양이온을 변화시킨 경우에는 BET 표면적과 정8면체 배위구조 속의 $Mo^{6+}$에 대한 정4면체 배위구조 속의 $Mo^{6+}$의 비, 즉 $Mo^6+[T]/Mo^{6+}[O]$ 값의 복합적인 관계를 통해 반응활성의 변화를 설명할 수 있었다. The effect of alkali metal salt on the activity of Co-Mo catalyst which has high resistance to sulfur poisoning for water gas shift reaction(WGSR) was studied. Two groups of catalysts were prepared to investigate the effects of anion and cation in alkali metal salts. For K-doped catalysts made with various potassium salts having different anion, the catalytic activity was explained to depend mainly on the BET surface area. Among the catalysts prepared by various nitrates of alkali metal as precursor, the Li-doped catalyst showed the best activity, and the others did not make significant differences giving relatively low activities. And the change of BET surface area by varying the loading of alkali metal showed a similar trend to that of activity. In this case, the activity was dependent on both BET surface area and the ratio of $Mo^{6+}$ with a tetrahedral coordination symmetry to $Mo^{6+}$ with an octahedral one, $Mo^6+[T]/Mo^{6+}[O]$ value.

      • KCI등재

        열이력에 따른 Poly(ethylene 2,6-naphthalene dicarboxylate) 섬유의 미세구조와 물성

        김준희,조현혹,Kim Joon Hee,Cho Hyun Hok 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.1

        PEN fibers spun at 4 km/min by melt-spinning were treated by high tension annealing (HTA) at $220^{\circ}C$. The as-spun PEN fibers and fibers treated by HTA at $220^{\circ}C$ were given various thermal history. The fine structure and physical properties of the PEN fibers were investigated with various techniques such as wide-angle X-ray diffraction, DSC thermograms, density, birefringence, dynamic viscroelasticity, tensile testing, etc$\ldots$ In case of the PEN fibers treated by HTA at $220^{\circ}C$, change with thermal history could not be detected from WAXD diagrams and DSC thermograms. In the case of dynamic viscoelasticity of PEN fibers treated by HTA, storage modulus decreased with thermal history. Also, birefringence and initial modulus of the PEN fibers treated by HTA decreased rapidly. Therefore, orientation of non-crystalline region is lowered. From tilting WAXD diagrams, in case of $6^{\circ}$ tilting, peaks became bigger with thormal history. Thus, thermal history affect not only the non-crystalline region but also the crystalline region. WAXD diagrams of PEN fibers at different temperatures from $23^{\circ}C\;to\;220^{\circ}C$ suggested that only d-spacing of $\beta$ form crystal increased. But the d-spacing of transformed $\alpha$ form crystal did not change. Also d-spacing returned to the original value on cooling.

      • KCI등재

        고장력 열처리한 Poly(ethylene 2,6-naphthalene dicarboxylate) 섬유의 미세구조와 물성

        김준희,조현혹,Kim Joon Hee,Cho Hyun Hok 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.1

        PEN fibers spun at 4 km/min by high speed melt-spinning were treated by two methods, constant length annealing (CLA) and high tension annealing (HTA) at 130, 160, 190, and $220^{\circ}C$. The fine structure and physical properties of the PEN fibers were investigated with various techniques such as wide-angle X-ray diffraction, DSC thermo-grams, density, birefringence, tensile test etc. As the annealing temperatures is increased, a partial transition of the crystal structure, from $\beta$ form crystal to $\alpha$ form crystal appeared in the WAXD test in case of CLA treatment. But, in case of HTA treatment, the transition of the crystal form from $\beta$ form crystal to $\alpha$ form crystal appeared dominantly. As the annealing temperature and tension increases, the melting peaks become sharper in DSC thermograms. Density of PEN fibers from HTA treatment is lower than that from CLA treatment, but birefringence and initial modulus of the PEN fibers from HTA treatment are much higher than those from CLA treatment. But, shrinkage of the PEN fibers from HTA treatment is higher than that from CLA treatment.

      • 연구논문 - 촉매분과 : 수성가스 전환반응용 CoMo 촉매의 활성에 미치는 알칼리 금속염의 영향

        김준희,이호인 ( Joon Hee Kim,Ho In Lee ) 한국공업화학회 1997 한국공업화학회 연구논문 초록집 Vol.1990 No.3

        N/A Effects of alkali metals and anions on CoMo catalysts for water gas shift reaction were studied. For CoMo/γ-Al₂O₃ catalysts made by impregnation, the doping of alkali metals like lithium enhanced the activity. For K-doped catalysts made with the potassium salts having different anions, the activity increased with increasing BET surface area. Among the catalysts prepared by nitrates as precursor, Li-doped catalyst showed the best activity, and the others did not make significant differences giving a relatively low activity. Both BET surface area and TPR did not show significant differences in the catalysts doped with alkali metals in the form of nitrates. However, the activity of the Li-doped catalyst was remained relatively constant with the amount of Li doped, whereas those of other catalysts changed with the amount of Li doped.

      • KCI등재후보

        직접 메탄올 연료전지용 산화극 제조 변수가 성능에 미치는 영향

        김준희,하흥용,오인환,홍성안,이호인,Kim, Joon-Hee,Ha, Heung-Yong,Oh, In-Hwan,Hong, Seong-Ahn,Lee, Ho-In 한국전기화학회 2003 한국전기화학회지 Vol.6 No.1

        Single cell performance has been investigated and characterized with variables in the fabrication of DMFC anode. The performance was checked as a function of ionomer content which affects ion conductivity in the catalyst layer, and catalyst slurry solvent which determines structure of agglomerates consisting of an ionomer and a catalyst. Anode with total ionomer to catalyst ratio of 0.6 showed the best performance and the lowest polarization resistance. Also, electrochemically effective surface area increased with ionomer content. As solubility of the ionomer decreases with decreasing solvent polarity, the size of agglomerates consisting of a catalyst and an ionomer became larger in the less polar solvent. The anode using DPK $(\varepsilon=12.60)$ as a solvent, which is less polar than generally-used water or alcohol species, showed the maximum performance and the lowest polarization resistance. 직접 메탄을 연료전지(DMFC)의 산화극 제조 변수들에 따른 단위전지의 성능변화 관찰 및 특성분석을 수행하였다. 촉매층에서의 이온 전도도에 영향을 주는 이오노머의 양과, 이오노머와 촉매의 결합구조를 결정하는 촉매 슬러리의 용매를 변수로 하였다 전체 이오노머의 비가 0.6일 때 최고 성능을 보였으며 분극 저항도 가장 작게 나타났다. 전기화학적 활성면적도 이오노머가 늘어날수록 증가하였다. 극성이 작은 용매일수록 이오노머가 잘 용해되지 않아 촉매 응집체의 크기가 커졌다 기존의 물이나 알코올 종류의 용매들에 비해 극성이 낮은 DPK $(\varepsilon=12.60)$를 사용하여 제조한 전극이 가장 높은 성능을 보였으며 낮은 분극 저항 값을 가졌다.

      • SCOPUSKCI등재
      • KCI등재

        지도자 전문성이 볼링선수의 경기몰입에 미치는 영향

        김준희(Joon Hee Kim),이승우(Seung Woo Lee),이신언(Shin Eon Lee) 한국사회체육학회 2014 한국사회체육학회지 Vol.0 No.55

        The purpose of this research is to examine the effect of coach`s expertism on bowling players flow in games. For this study, the survey was carried out on 328 registered Korean Bowling Congregation (March, 2009) players. We obtained some implications through using SPSS 14.0 program on factor analysis, reliability analysis, t-test. simple regression analysis, and multiple regression analysis. Firstly, we found differences between player`s recognition on coach`s expertism and their flow in games, depending on each player`s personal traits. Specifically, coach`s expertism in relation to player`s genders howed a higher technical expertism and discernment/analytic for female players than male players, and no distinctive differences were found in theoreticalexpertism. The effect of coach`s expertism on player`s career showed a negative impact on theoretical expertismand discernment/analytic, and no distinctive differences were found in technical expertism. The effect o fcoach`s expertism on training duration showed a positive impac ton all expertism- theoretical, technical, anddiscernment/analytic of the player. And player`s gender in relation to flow in games showed that female playerstend to have more specified/clear goals than male players, and have no distinctive differences in other aspects. The effect of player`s career on flow in games showed a positive impact on challenge, skill balance, clear goals,sense of control, autotelic experience and transformation of mti e. There was no distinctive difference in los sof self-consciousness. The effect of coach and training duration on player`s flow in games showed a positiveimpact on challenge, skill balance, sense of control and autotleic experience, but it showed no distinctive d-ifferences on other aspects. Secondly, there are partial influences for the effects of coach`s expertism in players` game devotion. Specifically, it turned out that there are not significant dieffrences of coach`s expertism for challenge andtechnique. The effect of coach`s expertism on specified goal, both theoretical expertism and insights/abilityto analyze made differences, but no distinctive differences were found in technical expertism. The effect ofcoach`s expertism on the sense of control, there only was significant difference in technical expertism, but notin theoretical expertism and insights/ability to analyze. In teh effect of coach`s expertism on autotelic exper-ience and loss of self-consciousness showed no distinctive differences. For the effects of coach`s expertism totransformed time, there are significant differences in insights/ability to analyze but not in theoretical and technicalexpertism.

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