Cone-beam computed tomography를 이용한 미맹출 영구치의 계측

김성희,김영종,김신,정태성,Kim, Seong-Hee,Kim, Young-Jong,Kim, Shin,Jeong, Tae-Sung 대한소아치과학회 2012 대한소아치과학회지 Vol.39 No.2

The purpose of this study was to evaluate the accuracy and reproducibility of measuring the size of unerupted permanent tooth via cone beam computed tomography(CBCT). Ten children were scanned with dental CBCT, and 3-dimensional reconstruction of the dentitions were generated CBCT. Mesio-distal dimension and buccolingual dimension of the teeth were made directly on the model with a high-precision digitalcaliper and on the CBCT by using three-dimensional dental imaging software. Reliability and accuracy were assessed by using intraclass correlation and paired $t$-tests. ($p$ <0.05) The results were as follows : 1. Intraclass correlations were above 0.9 for Both the CBCT and the model measurements, showinghigh reliability. 2. Although there were high correlation values(r=0.91) between CBCT and model messurement methods, comparisons between the CBCT and model messurement methods showed a statistically significant difference($p$ <0.05). 3. The CBCT measurements tended to slightly underestimate by 0.2 mm. But, the systematic difference of CBCT measurements were clinically acceptable Therefore, CBCT measurement method can be used to measure the size of unerupted teeth in a sufficiently accurate way.

영상 복잡도에 따라 선택된 화소들을 이용한 블록 정합 알고리즘

김성희,오정수,Kim Seong-hee,Oh Jeong-su 한국정보통신학회 2005 한국정보통신학회논문지 Vol.9 No.8

본 논문은 블록 정합에 크게 기여하는 화소들만을 이용함으로 정합 계산량을 줄이는 변형된 블록 정합 알고리즘을 제안한다. 알고리즘 구현과 부가 정보를 고려하여 제안된 알고리즘은 정합 블록을 서브블록들로 나누고, 서브블록의 복잡도를 이용해 일부의 서브블록들만을 선택해 정합을 수행한다. 모의실험 결과는 제안된 알고리즘이 계산량을 줄이면서 유효한 정합을 수행하는 것을 보여준다. This paper proposes a modified block matching algorithm which reduces an amount of matching computation by using only pixels contributing greatly to block matching. In consideration of algorithm implementation and additional informatirm, the proposed algorithm divides a matching block into sub-blocks, selects some sub-blocks using their complexities, and execute the block mating with them. Simulation results show that the proposed algorithm performs a valid block matching, diminishing computation cost.

방사선에 의한 Apoptosis에서 Fas의 역할

김성희,성진실,성제경,Kim, Sung-Hee,Seong, Jin-Sil,Seong, Je-Kyung 대한방사선종양학회 2002 대한방사선종양학회지 Vol.20 No.3

Purpose : It has been recognized that interaction of the Fas : Fas ligand plays an important role in radiation-induced apoptosis. The purpose of this study was to investigate the role of Fas mutation in radiation-induced apoptosis in vivo. Materials and Method : Mice with mutations in Fas, $MRL/Mpj-Fas^{Ipr}$, and its normal control, MRL/Mpj, were used in this study. Eight-week old male mice were given whole body radiation. After irradiation, the mice were killed and their spleens were collected at different time intervals. Tissue samples were stained with hematoxylin-eosin and the numbers of apoptotic cells were scored. Regulating molecules of apoptosis including p53, Bcl-2, Bax, $Bcl-X_L,\;and\;Bcl-X_S$ were also analyzed by Western blotting. Results : At 25 Gy irradiation, the level of apoptosis reached the peak value at 8 hr after radiation and recovered to the normal value at 24 hr after radiation in MRL/Mpj mice. In contrast, the peak apoptosis level appeared at 4 hr after radiation in $MRL/Mpj-Fas^{Ipr}$. At 8 hr after radiation, the levels of apoptosis in MRL/Mpj mice and $MRL/Mpj-Fas^{Ipr}$ mice were $52.3{\pm}7.8\%\;and\;8.0{\pm}8.6\%$, respectively (p<0.05). The expression of apoptosis regulating molecules, p53, $Bcl-X_L\;and\;Bcl-X_S$, increased in MRL/Mpj mice in response to radiation; p53 with a peak level of 3-fold at 8 h, $Bcl-X_L$ with a peak level of 3.3-fold at 12 h, and $Bcl-X_S$ with a peak level of 3-fold at 12 h after 25 Gy radiation. Bcl-2 and Bax did not show significant change in MRL/Mpj mice. However in $MRL/Mpj-Fas^{Ipr}$ mice, the expression levels of p53, Bcl-2, Bax, $BCl-X_L\;and\;BCl-X_S$ showed no significant change. Conclusion : The level of radiation-induced apoptosis was lower in Fas mutated mice, Ipr, than in control mice. This seemed to be related to the lack of radiation-induced p53 activation in the Ipr mice. This result suggests that Fas plays an important role in radiation-induced apoptosis in vivo.

웹 검색 결과 시각화 기법의 사용성 평가에 관한 연구

김성희,김문정,Kim, Seong-Hee,Kim, Moon-Jeong 한국문헌정보학회 2007 한국문헌정보학회지 Vol.41 No.3

This study is to suggest the usefulness of visualization techniques to display web retrieval results. We described the concept of visualization techniques and evaluated the usability for the SearchCrystal and KartOO search engines which provide visualization techniques for displaying the retrieval results. As a result, Searchcrystal search engine had higher score than KartOO system in terms of usability check lists.

공동주택의 분양시기 변화에 따른 공급자의 수익성 비교 분석

김성희,Kim, Seong-Hee 한국건설관리학회 2012 한국건설관리학회 논문집 Vol.13 No.5

It has been five years since the Post-Construction Sale System of Housing was introduced. The purpose of this study is to identify objectives and effects of the Post-Construction Sale System of Housing and analyze change of profitability at different sales time from a supplier's point of view. Apartment buildings construction projects performed in Seoul are used for the case study. The present value of sales revenues, sensitivity and the present value of expected sales prices are analyzed. According to the findings, first, profits made from a Pre-construction sales system was 5.1%~6.2% higher than those from a Post-construction sales system. Among four plans of a Pre-construction sales system (A, B, C and D plan), sales revenue from the A plan, which takes a deposit at the time of starting construction, was the greatest. Second, increase of the rate of discount and decrease of sales revenues are in direct proportion. The bigger rate of discount leads actual reduction of sales revenues. Third, for the present value of sales revenues reflecting change in basic model construction cost, a Pre-construction sales system showed a little higher than that of a Post-construction sales system by approximately 2%. It should be known that this study suggests profitability of Pre-and Post-construction sales system by clearly measuring them in the supplier's point of view and calculates sales revenues, considering change of a sale price following change of sales time.

문헌정보학 연구에 있어서 타당도 및 신뢰도에 관한 연구

김성희,Kim, Seong-Hee 한국문헌정보학회 2000 한국문헌정보학회지 Vol.34 No.2

This study describes validity and reliability, which are important factors to obtain scientific results in the study of library and information science. Specifically, this paper starts by exploring the definition and types of validity and reliability. It then analyzes the factors which affect to validity and reliability in developing test-items through the previous studies. It is proposed that validity and reliability be regarded as basic and important components to solve problems related to library and information science in the future scientifically.

테트라싸이크린 함유 calcium sulfate의 서방형 국소 약물 송달 효과에 대한 연구

김성희,최성호,조규성,채중규,박광균,김종관,Kim, Sung-Hee,Choi, Seong-Ho,Cho, Kyoo-Sung,Chai, Jung-Kiu,Park, Kwang-Kyun,Kim, Chong-Kwan 대한치주과학회 1997 Journal of Periodontal & Implant Science Vol.27 No.4

Periodontal disease is a bacterially causal by disease, To remove plaque and bacteria, it has been necessary to prescribe chemical drug to patient to subjugate therapeutic unvalue by mechanical scaling. As a patient on a high dosage of the antibiotics to maintain the effective concentration may produce unfavorable side effects, this decase demands the Slow-release local drug delivery system. The object of the experiment is to study on the slow-release local drug delivery effects of calcium sulfate compounded with tetracycline that mainly used in periodontal disease. Experimental groups were divided into four classes as follow: Group 1 10% tetracycline compounded modified calcium sulfate paste. Group 2 : compounded and hardened 10% tetracycline and calcium sulfate. Group 3 : compounded 10% tetracycline and calcium sulfate, used Just before hardened. Group 4 : tetracycline-ethylene vinyl acetate fiber. In the four groups, release concentration, it's durability and the period of absorption by times are observed and concluded as follow: 1. An effective concentration($4{\mu}g/ml$) remained until 5 weeks in group 1, 9 days in group 2, 7 days in group 3, 15 days in group 4. 2. It was fully fused at 11.8 days average in group 2 and 14.8 days average in group 3. . There were no statistically significant results in tetracycline concentration until a week in group 2 and 3(p<0.05) These results suggest that tetracycline loaded calcium sulfate release sufficient tetracycline and fused in $11{\sim}14$ days, so calcium sulfate is useful carrier as slow release local drug delivery system.

규소 슬래그를 이용한 수용상 비소 흡착 제거

김성희,설정우,이우춘,김순오,Kim, Seong Hee,Seol, Jeong Woo,Lee, Woo Chun,Kim, Soon-Oh 대한자원환경지질학회 2013 자원환경지질 Vol.46 No.6

This study was initiated to evaluate the applicability of Si slag as an adsorbent via investigation of the main properties of Si slag as an adsorbent aw well as characterization of adsorption features between aqueous arsenic and Si slag. The specific surface area of Si slag was measured to be 6.71 $m^2/g$ which seems to be slightly higher than those of other slags, but relatively lower than those of iron (oxyhydr)oxides extensively used for arsenic controlling processes. The point of zero salt effect (PZSE) of Si slag determined by potentiometric titration appeared to be comparatively high (7.3), indicating the Si slag may be favorably used for adsorption of arsenic which predominantly exists as an oxy-anions. The results of adsorption isotherm indicate that regardless of arsenic species, Langmuir-type isotherm is the most suitable to simulate the adsorption of arsenic onto Si slag. With regard to pH-dependence of arsenic adsorption, the adsorption maxima of arsenite was centered at pH 7, and the adsorption was remarkably decreased in the other pH conditions. In the case of arsenate, on the other hand, the adsorption was highest at the lowest pH (4.0) and then gradually decreased with the increase of pH. Based on the results of kinetic experiments, it is likely that the adsorption of arsenite approached equilibrium within 2 hr, but it took about 8 hr for arsenate adsorption to be equilibrated. In addition, the Pseudo second order was evaluated to be most consistent with the empirical data of arsenic adsorption onto Si slag in this study. Under identical conditions, the affinity of arsenate onto Si slag was estimated to be nearly 6 times higher than that of arsenite.

법학도서관 웹사이트 내비게이션 비교.분석

김성희,이용미,Kim, Seong-Hee,Lee, Young-Mi 한국과학기술정보연구원 과학기술정보센터 2007 Journal of Information Science Theory and Practice Vol.38 No.3

In this study, we analyzed the web site navigation of law school libraries in terms of global, local, context, support navigation. The recommendations for good web site design were as follows. First, global navigation should provide the consistent navigation and be able to access to the important site and function. Second, quick links of local navigation need to provide the movement of scroll bar. The number of menu and type of link in context navigation should provide the least number. Finally, the site map and index should provide with qualified contents and minimal errors.

도서관 모바일 웹사이트의 인포메이션 아키텍처에 관한 연구

김성희,남재우,Kim, Seong-Hee,Nam, Jae-Woo 한국과학기술정보연구원 과학기술정보센터 2011 Journal of Information Science Theory and Practice Vol.42 No.1

본 연구는 도서관 모바일 웹사이트의 구조를 분석하여 특징과 문제점을 살펴보고 이를 통해 올바른 인포메이션 아키텍처 방향에 대해 제시하고자 한다. 이를 위해 미국과 캐나다 8개 대학도서관의 모바일 웹사이트를 조사하였고 정보구조와 내비게이션 체계, 레이블링 체계를 기준으로 분석하였다. 연구결과 첫째, 연구대상 도서관들의 모바일 웹사이트의 정보구조는 선형구조였다. 조사대상 각 도서관에서는 메인화면에서 4~15개의 메뉴를 제공하고 있었으며, 공통적인 메뉴는 자료검색과 도서관안내 메뉴이며, 대부분의 도서관에서 PC용 웹사이트의 연결, 문의, 뉴스 등을 제공하고 있었다. 둘째, 도서관의 모바일 웹사이트들은 대부분 서브도메인이나 서브디렉토리에 'm'이나 'mobile' 같이 모바일을 나타내는 표현을 사용해서 웹페이지의 URL을 구성하고 있었다. 마지막으로, 각 도서관 모바일 페이지의 메인레이블과 세부레이블을 표현하는 데 일관성이 없는 것으로 나타났다.