• The Korean Journal of Applied Statistics
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• v.23 no.2
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• pp.235-247
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• 2010

In this paper it is investigated how the number of work experiences is distributed among college graduates who have ever entered the labor market and built up career by turnover. To do so, we classified the type of work experience and, moreover, conduct ANOVA to explore wage differentials caused by the number of work experience and by the type of work experience, using the GOMS(graduates occupational mobility survey) from 2006 to 2007.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.19 no.2
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• pp.184-190
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• 2010

Recently, the polishing process using magnetorheological fluids(MR fluids) has been focused as a new ultra-precision polishing technology for micro and optical parts such as aspheric lenses, etc. This method uses MR fluid as a polishing media which contains required micro abrasives. In the MR polishing process, the surface roughness and material removal rate of a workpiece are affected by the process parameters, such as the properties of used nonmagnetic abrasives(particle material, size, aspect ratio and density, etc.), rotating wheel speed, imposed magnetic flux density and feed rate, etc. The objective of this research is to predict MRR according to the polishing conditions based on the multiple regression analysis. Three polishing parameters such as wheel speed, feed rates and current value were optimized. For experimental works, an orthogonal array L27(313) was used based on DOE(Design of Experiments), and ANOVA(Analysis of Variance) was carried out. Finally, it was possible to recognize that the sequence of the factors affecting MRR correspond to feed rate, current and wheel speed, and to determine a combination of optimal polishing conditions.

• Journal of the Korea Society of Computer and Information
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• v.5 no.4
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• pp.180-188
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• 2000

This study was conducted to identify the difference in the level of confidence about venture creation between MIS students and those of other business major in the USA. For this study, data were collected from 70 business students including ANOVA, t-test and multiple regression were employed to analyze the collected data. The results of the study show that MIS students who have interdisciplinary knowledge including IT field and business field, have much higher level of confidence about venture creation. The results of this study suggest that MIS education be required to build an effective entrepreneurship education for business major students.

• Journal of Convergence for Information Technology
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• v.7 no.5
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• pp.25-30
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• 2017

This study was to investigate the supporting awareness and empathy with the dental hygiene student. The participants were 193 dental hygiene students in Gwang Ju city and analyzed by the frequency analyzed, t-test, ANOVA, pearson corelation coefficients and multiple regression analysis using IBM SPSS STATICS 20.0. Supporting awareness and empathy about the elderly had a significant positive correlation. Factors influencing empathy were interest of elderly problem and supporting awareness. It is necessary to the establishment of a subject and education program about elderly in dental hygiene students.

• Communications for Statistical Applications and Methods
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• v.18 no.1
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• pp.119-130
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• 2011

This paper measures and analyzes the performance of insurance companies in Korea in respect to sustainable development and suggest strategic implications based on the analysis. The correlation, regression, ANOVA, and t-test are employed. The results of this study are summarized as follows. First, it shows tat social index is important in the life insurance industry; however, the environmental index, is important in the non-life insurance industry. Second, the result gained by regressing the size and financial soundness on the performance of sustainable development demonstrates that the size variable is statistically significant. It suggests that size is a necessary condition for sustainable development. Finally, ANOVA shows that the small and medium sized companies have a significantly poor performance compared to the large companies concerning the social index and reputation index in the life insurance industry. The small and medium sized companies in the non-life insurance industry exhibit a significantly poor performance compared to the large companies in respect to all the indexes, except for the social index. Therefore, the small and medium sized companies make every endeavor in the poor indexes to improve performance.

• Analytical Science and Technology
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• v.20 no.3
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• pp.219-226
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• 2007

Glass is frequently encountered as types of materials that are submitted to forensic science laboratories as a result of trace evidence transfers. The repeatability and the reproducibility of trace element analysis were presented. An analysis of variance (ANOVA) was performed on laser ablation inductively coupled plasma spectrometric analyses of the fragments to identify the source. Pairwise comparisons were completed for all samples. In a pairwise comparison, each sample was compared to each other for a possible [n(n-1)/2] (n : numbers of the samples) total comparison to associate/discriminate samples using Tukey's HSD method. The aim of this study was to determine the utility of LA-ICP-MS for multi-element analysis of forensic samples. The 12 glass fragments from two manufacturers were collected and analyzed to identify the source. An analysis of variance (ANOVA) was performed on 31 elements in NIST 612 Trace elements in Glass. Elements were classified into four categories defined by the combination of precision and variation of inter-samples. We selected 11 elements, 209Bi, 90Zr, 121Sb, 178Hf, 59Co, 238U, 208Pb, 140Ce, 118Sn, 49Ti and 137Ba. 6 pairs out of 66 possible pairs were not distinguished when compared by 137Ba (p<0.05). However, all samples were distinguished using both 49Ti and 137Ba (p<0.05). In conclusion, multi-elemental analysis with LA-ICP-MS is a potential tecnique for the discrimination of forensic samples.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2003.05a
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• pp.586-590
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• 2003

고객 분류는 고객관계관리(CRM)의 한 부분으로서 기업에게 이익을 주는 고객의 속성과 구매패턴을 분석함으로써 목표 고객을 결정하는 것을 의미한다. 현재까지 고객 분류에 관한 연구는 특정한 시점에서 고객의 속성과 구매 패턴을 분석함으로써 이루어졌다. 그러나 인터넷 쇼핑몰과 같은 동적인 환경에 있어서 기존의 정적인 분석방법은 시간에 따라 지속적으로 변하는 고객의 행동 변화를 찾아내고, 예측하는데 적합하지 않다. 본 논문에서는 Decision Tree, ANOVA 분석, ARIMA 모형을 사용하여, 특정한 시점에서의 고객 분류뿐만 아니라 미래 시점에서의 고객 분류를 예측하고 패턴을 분석하는 동적인 고객 분류 방법을 제안한다. 동적인 고객 분류를 통해 인터넷 쇼핑몰 기업은 효율적인 마케팅 전략을 작성하여 기업의 이익을 증진시킬 수 있다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.15 no.1
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• pp.77-86
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• 2016

Drivers can receive diverse types of traffic information through a number of methods. However, there are not enough information services considering human factors. In this study, as a basic research on human factors of the drivers, characteristic analysis on drivers' mean glance (fixation) durations with different running speeds on the expressway was performed under diverse running environments. To control variables other than running speeds, running environments were categorized into 4 types: 'daytime running without preceding vehicles', 'daytime running with preceding vehicles', 'nighttime running without preceding vehicles', and 'nighttime running with preceding vehicles'. Furthermore, ANOVA Test was used to divide speed groups. As a result of performing a multiple comparison to compare differences in glance behavior per each group, the road item and the preceding vehicles item showed an increase in mean glance durations as the speed increased, while the front view showed a decrease in mean glance durations. It was confirmed that the road sign showed no statistically significant difference in glance durations as the speed varied.

• Economic and Environmental Geology
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• v.35 no.6
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• pp.545-552
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• 2002

In order to investigate the influence of nuclear power plant operation on its nearby environment, soil, stream and marine sediment samples were collected in the vicinity of the Youngkwang Nuclear Power Plant in Korea, and analyzed for artificial and natural radionuclide radioactivity. From the analytical result, Cs-137 was detected in most soil samples. but it may have been derived fiom past nuclear weapon tests because Cs-134 having short half-live was not detected. The radioactivities of Cs-137 in the sediment samples were also detected which are within the normal range in the sediments based upon the published literature between 1997 and 1999. For the quality control of radioactivity analysis of environmental samples, sets of marine sediments in the Gamami area were analyzed using two HPGe Gamma-ray Spectroscopes (30% and 45%) according to the geostatistical sampling strategy, and Cs-137 and K-40 results were interpreted by analysis of variance (ANOVA). In the two-way ANOVA, variances derived from the geochemical variation were significant, but errors from sampling and analytical procedures are negligible. In conclusion. all the radioanalytical procedures of this study including sampling are validated to be acceptable.

• Korean Journal of Construction Engineering and Management
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• v.9 no.6
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• pp.137-146
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• 2008

Both competent authorities and private entrepreneurs face plenty of risks when negotiating BTO(Build Transfer Operation) methods of PPI(Private Participations in Infrastructures) projects. Also, success and failure of projects largely depend on the concession agreement contract. In this study, for more efficient negotiation, major issues are examined, and quantitatively analyzed to find out not only the relationship but also the characteristics of which these issues share. Questionnaire research was conducted through both research and by experts who were divided into an ordering agency, design company and constructor. Characteristics of major issues were quantitatively analyzed using the Likert index method, ANOVA(ANalysis of VAriance) and AHP(Analytic Hierarchy Process) analysis. Case studies were examined in order to estimate construction cost, rates of return, government finance support, level of operation-revenues guarantees, estimating operational costs and usage fees. With these 6 items, relative priority, relative impression which is sensible to risk and extent of difficulty in presenting data which is objective were quantitatively analyzed by the ordering agency, design company and constructor groups. From the analysis, there were some similarities between the design company and constructor groups while there was less of similarities between the ordering agency and design company or constructor. The government is diversifying the methods of project promotion, and PPI project from infrastructure-centered to public culture facilities are being expand. The current study will provide not only supporting efficient negotiation but also revitalizing PPI projects.