• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• 제47권4호
• /
• pp.249-256
• /
• 2021

Objectives: The purpose of this study was to evaluate the postoperative anteroposterior stability and improvements in facial asymmetry after performing LeFort I osteotomy in the maxilla, sagittal split ramus osteotomy (SSRO) and intraoral vertical ramus osteotomy (IVRO) in the mandible, and lateral corticectomy on the IVRO side. Materials and Methods: From July 2009 to October 2018, a retrospective analysis was performed on 11 subjects. Lateral cephalometric radiograph was performed preoperatively (T0), postoperatively (T1), and at 12 months of follow-up (T2), and the B point distance was measured. Posteroanterior cephalometric radiograph was performed preoperatively (S0) and at 12 months of follow-up (S1) and was used to measure five indicators (Ag angle, M-Ag, Co-Ag, Co-Me, and Ag-Me) of facial asymmetry. Results: The B point distances for T0 and T1 were significantly different (P=0.007), whereas those for T1 and T2 were not significantly different (P=0.1). In addition, there was a significant difference between the B point distances of T2 and T0 (P=0.026). Comparison of the facial asymmetry indicators before and after surgery showed a significant difference for all indicators between S0 and S1: the P-values of Ag angle, M-Ag, Co-Ag, Co-Me, and Ag-Me were 0.003, 0.003, 0.008, 0.006, and 0.004, respectively. The Z value was based on negative ranks. Conclusion: There was no significant difference in the B point distances from postoperation to the 12-month follow-up. However, there were significant differences in all five indicators related to facial asymmetry before and after surgery. The values for the five indicators of facial asymmetry all increased postoperatively.

• 과학기술학연구
• /
• 제6권2호
• /
• pp.185-205
• /
• 2006

이 글에서는 과학기술국민이해도조사를 비롯한 다양한 자료를 활용하여 우리나라의 과학기술문화 하부구조에 관한 통계지표를 분석하였다. 유형적 하부구조의 경우에는 인터넷을 제외하면 과학관, 과학기술 TV 프로그램, 과학기술도서 등 유형적 하부구조의 확보율은 매우 낮은 수준이며, 이에 대한 활용도는 전반적으로 저조하지만 약간 증가하고 있는 추세를 보이고 있다. 무형적 하부구조와 관련해서는 일반 국민의 과학 기술에 대한 관심 및 이해가 아직 저조하고 과학기술자의 사회적 중요성에 비해 사회적 대우가 낮으며, 과학기술정책에 대한 과학기술자와 시민단체의 참여가 제한적인 것으로 나타나고 있다. 과학기술문화 통계지표의 발전을 위해서는 개인적 제도적 사회적 맥락을 고려한 조사, 특정한 집단에 대한 조사, 과학기술문화백서의 발간 등이 필요하다.

• 기술혁신연구
• /
• 제13권1호
• /
• pp.55-71
• /
• 2005

We attempt to make three composite Science and Technology (S&T) indices for overall understanding of national S&T by aggregation of various S&T indicators using fuzzy set theory and then use these Indices to compare the S&T activities of Korea with those of five developed countries (France, Germany, Japan, the U.K., the U.S.). The overall results suggest that although the S&T indices of Korea still lag behind those of developed countries, they have grown rapidly and continuously and, as a result, the S&T gaps between Korea and developed countries have narrowed. However, the capability of Korea to transform its R&D input into final economic output has not yet matched that of developed countries.

• 디지털산업정보학회논문지
• /
• 제9권2호
• /
• pp.121-137
• /
• 2013

Now days, firm's technology capability is recognized as important factor to forecast and to evaluate firm's business performance. There are many efforts to develop useful indicators by applying patent information that includes concrete description about technology. Many previous studies analyzed relationship between patent indicators and firm's performance. But they didn't consider time gap between a point of firm's invention activity and a point of firm's performance improvement. They didn't considered a character of industrial fields either. To overcome these limitations, we selected IT industry for target analysis industry. Time-series patent data and financial data from 41 American IT firms between 2000 and 2011 were used to analyze. In this study, We empirically analyzed subsequent effect of patent indicators on firm's business performance by using correlation analysis and regression analysis.

• 수산해양교육연구
• /
• 제24권2호
• /
• pp.234-245
• /
• 2012

This study aims to analyze the factors of the extra-curricula area in personal school performance record and propose the practical strategies for entrance examination affairs on this area. To address this goal, we have applied a SWOT analysis with related documents and research results. We found out five strengths: (S1) Link the students' experience to right people for the university, (S2) Quantitative Indicators, (S3) Qualitative Indicators, (S4) Link to other evaluation factors, and (S5) Analysis of Human Resource. The weakness included: (W1) Fairness, (W2) Reliability, (W3) Difficulties to set standards, (W4) Difficulties to set environments, and (W5) Lack of systemic experience of an evaluation. We also discovered five opportunities (O1) Recognition of public education, (O2) The need of national support, (O3) The importance of autonomy, (O4) Specialization, and (O5) Networks. Finally, threat factors consisted of: (T1) Frequent change of educational policy, (T2) Increasing of private education, (T3) Lack of information and preparation time, and (T4) The accuracy and reliability of personal school records. Based on these results, we suggested practical strategies with these four dimensions: S-O, W-O, S-T, and W-T.

• 한국환경농학회지
• /
• 제19권5호
• /
• pp.382-393
• /
• 2000

The principal indicators contributing to water qualities was screened by factor analyses, based on the monitored chemical parameters of water quality for various water resources from 1995 to 1999 in the small agricultural catchments of the Han River Basin. Water samples of streams, groundwaters, and reservoirs were taken four times a year from upper (Daegwanryong), middle (Dunnae and Chunchon) and lower (Guri) reaches of Han River Basin. In these areas, the respective type of farming practiced was alpine agriculture and livestocks raising, typical upland and paddy cultivation, and intensive cropping in the plastic film house. Water quality was monitored for twenty-one water quality parameters, including pH, EC, SS, T-N, T-P, COD, cations, anions, and heavy metals. pH, EC and COD of the stream waters were suitable for the Korea irrigation water quality guidelines. However, T-N and T-P concentrations of water samples in four catchments far exceeded the irrigation water guideline. Concentrations of canons and heavy metals in Wangsuk stream in Guri area were higher than those in streams in other areas. Factor analysis revealed that significant correlation was observed for 81 pairs out of 231 water quality indicators of stream water among the $21\;{\times}\;21$ cross correlation matrix of stream water quality indicators. The first factor accounted for 27.01% of the total variation in stream water quality indicators, and high positive factor loadings were shown on EC, K, Na, $NH_4\;^+-N$, $PO_4\;^{3-}$, $SO_4\;^{2-}$, and COD. Fifty-three water quality indicator pairs were significant out of 190 ground water quality parameters. The first factor accounted for 28.54% of the total variation in ground water quality indicators, and high loadings were revealed on EC, Ca, Mg, K, Na, $NH_4\;^+-N$, and $SO_4$. Twenty-nine pairs of reservoir water quality indicators were significant out of 66 pairs. The first factor accounted for 37.06% of the total variation in reservoir water quality indicators, and high loadings were shown on EC, Mg, K, Na, SS, T-P, Cl, and COD. These results demonstrate that EC was the first factor contributing to water quality.

• 정보화정책
• /
• 제25권3호
• /
• pp.29-51
• /
• 2018

제4차 산업혁명의 핵심기술인 사물인터넷기술의 발달로 인하여 다양한 서비스가 가능하게 되고, 그 과정에서 개인정보가 자유롭게 처리되게 되었다. 그러나 스마트기기를 비롯한 정보기기가 네트워크로 연결되면서 편리한 서비스가 제공될수록 개인정보 침해위협도 증가하고 있는 실정이다. 따라서, 본 연구는 다양한 사물인터넷서비스를 구현함에 있어서 안전한 환경을 구축하고, 그 가운데 유통되는 개인정보를 보호하기 위해 필요한 정책선정을 위한 중요도에 따른 우선순위를 분석하여 주요정책과제로 제언하고자 한다. 본 연구에서는 문헌조사를 바탕으로 개인정보보호정책지표들을 전문가대상의 델파이분석을 통해 3개 분야 9개 영역 25개 지표로 구성하였다. 이러한 개인정보보호정책지표들은 AHP기법의 설문조사로 66명 전문가들이 응답한 결과를 활용하여, 정책지표의 상대적 중요도 및 우선순위를 도출하였다. 그 결과, 개인정보보호정책분야에서는 정책적 분야, 기술적 분야, 관리적 분야 순으로 상대적 중요도 및 우선순위가 도출되었다. 또한, 정책적 분야를 구성하는 3개 영역 중에서는 IoT관련 개인정보보호법제도의 강화가 가장 중요하며, 정책지표 중에서는 IoT에서의 개인정보보호법률의 제 개정을 추진하는 것이 가장 중요하다고 응답하였다. 또한, 조사된 IoT개인정보보호정책의 분야 영역 지표에 대해 쌍대비교한 결과값은 일관성을 갖고 있었다. 이렇게 도출된 개인정보보호정책지표들은 앞으로 안전한 사물인터넷 정책을 추진하여 국가경쟁력을 이끄는데 기여하리라 본다.

• 대한수학회논문집
• /
• 제12권2호
• /
• pp.393-401
• /
• 1997

Let $A_1,A_2,\cdots,A_m$ and $B_1,B_2,\cdots,B_n$ be two sequences of events on a given probability space. Let $X_m$ and $Y_n$, respectively, be the number of those $A_i$ and $B_j$, which occur we establish new upper and lower bounds on the probability $P(X=r, Y=t)$ which improve upper bounds and classical lower bounds in terms of the bivariate binomial moment $S_{r,t},S_{r+1,t},S_{r,t+1}$ and $S_{r+1,t+1}$.

• 한국소음진동공학회논문집
• /
• 제25권7호
• /
• pp.462-469
• /
• 2015

This study was carried out to examine characteristics of various acoustic indicators evaluating speech intelligibility such as reverberation time(T₃₀), D₅₀, C₅₀ and speech transmission index(STI) in Korean elementary school classrooms. Results showed that mean T₃₀ at middle frequencies(500 Hz to 2000 Hz) measured in 9 classrooms was about 0.75 s, which exceeds a regulation specified on American National Standards(ANSI); 0.60 s. Mean D₅₀, C₅₀ and STI were 60 % to 66 %, +2 dB to +3 dB, and 0.65, respectively. The maximum difference in D₅₀ and C₅₀ according to different receiver points in a classroom was 13 % and 2.5 dB, while the maximum difference in T₃₀ was 0.03 s. Whereas STI measured in classrooms has relatively low correlation with other indicators, correlation between D₅₀ and C₅₀ was high, R²=.9964. In addition, T₃₀ and C₅₀ were fitted well as logarithmic regression curve with R²=.9610. It was +3.73 dB in C₅₀ and 68 % in D₅₀ which are the value corresponding to 0.60 s in T₃₀ on this curve.

• 한국콘텐츠학회논문지
• /
• 제17권11호
• /
• pp.331-341
• /
• 2017

최근 과학기술정보 콘텐츠 분석 기반의 R&D 전략 수립이 중요시됨에 따라 국내 외 과학기술 통계 정보를 수집, 범주화하여 DB를 구축하고 이를 증거 기반의 기초연구정책을 수립하는데 활용하고자 하였다. 국내 외 49종의 과학기술 관련 보고서 등 자료를 수집하여 6,446개 지표 추출, 877개 통계 정보로 범주화, 이중 208개를 집중 관리 통계로 도출하였다. 이렇게 구축된 DB의 활용성 제시를 위해 논문정보 관련 심층분석을 통해 제한적으로나마 우리나라 기초연구의 효과성을 보여주고자 하였다. 이를 위해, 고피인용 논문창출과 R&D 투자 간의 통계기반 분석과 고피인용 논문의 국내 외 지식맵 비교 분석을 실시하였다. 그 결과, 기초연구비 증가가 우리나라의 보편적 연구활동도와 세계적 연구성과 창출에 긍정적 영향을 미친 것으로 나타났다. 또한 순수기초연구분야로 간주되어온 수학, 물리, 화학이 신성장동력이라 불리는 AI, 청정에너지 등 기술 발전의 기반이 되어왔음을 알 수 있었다.