• 한국진공학회:학술대회논문집
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• 한국진공학회 2010년도 제39회 하계학술대회 초록집
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• pp.73-73
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• 2010

Various organic- and bio-conjugated nanoparticles have been studied extensively for biological applications in medical diagnoses and drug delivery systems. Gold nanoparticles (AuNP) and poly(ethylene glycol) (PEG) are known biocompatible materials to be used in vivo and are becoming increasingly important in biomedical applications. In this work, we investigated the stability of PEG-conjugated AuNPs, dialysis and centrifuge effects after synthesis or pegylation of AuNPs as a function of elapsed time by using ToF-SIMS imaging technique along with dynamic light scattering (DLS), UV-visible absorption spectroscopic and statistical analyses. Roughly 15-nm-sized AuNPs were synthesized in a citrate-conjugated form, and then converted into the thiol-terminated PEG (O-[2-(3-Mercaptopropionylamino)ethyl]-O'-methylpolyethyleneglycol, M.W.=5 kDa) form. Based on our data, we will show that ToF-SIMS imaging analysis along with DLS, UV-visible absorption and statistical analyses would be a useful method to evaluate stability of PEG-conjugated AuNPs in various environmental conditions.

• 한국보건간호학회지
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• 제23권2호
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• pp.199-206
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• 2009

Purpose: This study was designed to compare health habit and self-rated health status among early adulthood women in 1995, 2001, and 2007. Also, it was performed to determine correlations between health habits and self-rated health status. Methods: This research was investigated to identify a transition of health habits and self-rated health status. Participants who agreed to participate in the study were 18~25years old college women. Data was collected from 380 college students in 1995, 196 college students 2001, and 411 college students in 2007. Health habit assessment questionnaire was developed by authors. The reliability of the questionnaire were Cronbach $\alpha$=.87. Cronbach $\alpha$=.85, Cronbach $\alpha$=.90. The visual analogue scale which had 100 self-rating scores was used. All statistical analyses were used the Statistical Package for Social Sciences for Windows, Statistical analyses included descriptive statistics, Levene's test, repeated measure ANOVA, Brown-Forsythe test, Turkey test, Games-Howell test, and Pearson correlation coefficient test. Results: Health habit level, and self-rated heath status were significantly increased over time after 1995. Health habits was correlated with self-rated health status. Conclusion: Health habits and self-rated health status were influenced by health environments. Health practitioner can use perceived health status to access health habits.

• 한국비블리아학회지
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• 제25권3호
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• pp.191-214
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• 2014

본 연구는 한국교육학술정보원(KERIS)이 운영하는 학술정보통계시스템(rinfo.kr)의 2010-2013년간 대학도서관통계를 대상으로 지속가능성에 기반한 경영자원 확보를 성과요소로 한 탐색적 통계분석을 목표로 한다. 이를 위해 선행되는 영향요소 및 후행되는 성과요소를 고려하고 규모 및 사회경제적인 외부변인들을 통제하기 위한 변화율 중심의 변수를 산출하는 전처리 방법을 통계에 적용하였으며, 이를 통한 변수를 대상으로 요인분석과 회귀분석을 실시하였다. 요인분석 결과 13개의 요인을 추출할 수 있었으며, 회귀분석 결과 대학도서관 경영자원 확보에 영향을 미치는 변수를 확인하였다. 분석결과를 바탕으로 극단값의 문제, 변수 간 낮은 상관성, 그리고 낮은 효과크기를 배경으로 한 새로운 변수의 개발을 논의하였다. 본 연구를 통해 지속가능성에 기반한 대학도서관의 통계체계, 평가, 나아가 경영에 대한 논의가 확산되기를 기대한다.

• Corrosion Science and Technology
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• 제21권6호
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• pp.525-525
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• 2022

• 대한환경공학회지
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• 제38권2호
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• pp.71-78
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• 2016

본 연구에서는 낙동강 창녕함안보 구간의 수질을 통계분석을 이용하여 수질 특성을 파악하였다. 다양한 통계분석기법 중에서 상관분석과 주성분분석 및 요인분석을 실시하였으며, 강우에 따른 조류의 천이양상을 연구하였다. 이는 향후 창녕함안보 구간의 수질관리정책 수립을 위한 기초 자료를 구축하는데 매우 중요한 자료이다. 측정 자료의 상관성 분석 결과, 클로로필-a와 조류는 상관성이 유의하지 않게 나타났으며, 요인분석 결과로 3개의 주성분이 추출되었으며, 제 1요인으로는 COD, TOC, BOD, pH, 수온이 분류되었다. 또한, 강우에 따른 조류의 천이양상을 분석한 결과, 강우 후에는 남조류의 수중개체 농도가 감소하는 추세를 보인 반면, 규조류와 녹조류의 개체 농도는 다소 증가하였다.

• Restorative Dentistry and Endodontics
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• 제47권2호
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• pp.20.1-20.14
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• 2022

Objectives: The study investigated the difficulties experienced by endodontics researchers around the world in conducting studies and writing papers. Materials and Methods: A survey consisting of 18 questions on the difficulties experienced by endodontics researchers in performing studies and writing papers was e-mailed to academics in the field of endodontics working at 202 universities. The independent risk factors were analyzed using binary logistic regression at a significance level of 0.05. Results: A total of 581 individuals (10.7%) agreed to participate in the study. Almost half the participants (48.2%) reported that they had received some type of training in conducting studies and writing papers. In response to the question, "Do you get help from a statistician to perform the statistical analyses of your studies?," 77.1% answered "yes." Around 40% of the participants stated that the need to obtain ethical approval negatively affected their desire to conduct studies. The participants' regions had no effect on the reported difficulties associated with writing papers in English or conducting statistical analyses (p > 0.05). Most participants (81.8%) reported difficulties in writing the Discussion section, regardless of their region, academic degrees, or years of experience. Conclusions: The participants stated they experienced difficulties in many areas, such as conducting statistical analyses, finding new ideas, and writing in English. Engaging in a detailed examination of ethics committee rules, expanding biostatistics education, increasing the number of institutions providing research funding, and increasing the number of endodontics journals can increase the enthusiasm of endodontics researchers to publish papers.

• 한국국방경영분석학회지
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• 제34권1호
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• pp.47-59
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• 2008

본 연구는 방위산업체의 연구개발 투자활동이 경영성과에 대하여 어떠한 영향을 미치는지에 대하여 실증적 분석을 수행하였다. 연구의 주요 분석 결과에 대해서 살펴보면 다음과 같다. 첫째, 방위산업체의 성장성 증대를 위해서는 연구인력의 교육지원 기회 확대, 관련부서간의 긴밀한 협력이 필요한 것으로 나타났다. 둘째, 방위산업체의 생산성 증대를 위해서는 연구개발 투자비를 증대해야 하며, 셋째, 방위산업체의 수익성 증대를 위해서는 관련부서 간 협력강화가 정(+)의 영향을 미치는 것으로 나타났다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 봄 학술발표회 논문집
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• pp.497-500
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• 2000

This paper describes the procedures to estimate for the design thermal loads on prestressed concrete box girder bridges on th basis of the extreme analysis of the temperature data obtained from long-term thermal analyses. Long-term thermal analyses using the environmental data for three years were conducted, and the extreme distributions of th thermal loads are then determined by the tail-equivalence method, and the thermal loads corresponding to selected return period are calculated. Finally, the results are compared to the specifications suggested in a current design code for thermal loads.

• 품질경영학회지
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• 제14권1호
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• pp.19-25
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• 1986

This paper studies the computer programming of statistical methods. A few computer programs are developed for * computing the basic statistics and the coefficients of process capability for raw and grouped data * drawing the frequency table and histogram * goodness of fit testing for normality with the analyses for stratifications if necessary. A special emphasis is laid on the significant digits and rounding-off for the output. A running result appears in the Appendix for a hypothetical example.

• Communications for Statistical Applications and Methods
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• 제12권3호
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• pp.807-818
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• 2005

In this paper we propose an estimation method for regression quantiles with left-truncated and right-censored data. The estimation procedure is based on the weight determined by the Kaplan-Meier estimate of the distribution of the response. We show how the proposed regression quantile estimators perform through analyses of Stanford heart transplant data and AIDS incubation data. We also investigate the effect of censoring on regression quantiles through simulation study.