• Korean Journal of Remote Sensing
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• v.37 no.6_2
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• pp.1891-1900
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• 2021

Fine particulate matter (FPM; diameter ≤ 2.5 ㎛) is frequently found in metropolitan areas due to activities associated with rapid urbanization and population growth. Many adolescents spend a substantial amount of time at school where, for various reasons, FPM generated outdoors may flow into indoor areas. The aims of this study were to estimate FPM concentrations and categorize types of FPM in schools. Meteorological and chemical variables as well as satellite-based aerosol optical depth were analyzed as input data in a random forest model, which applied 10-fold cross validation and a grid-search method, to estimate school FPM concentrations, with four statistical indicators used to evaluate accuracy. Loose and strict standards were established to categorize types of FPM in schools. Under the former classification scheme, FPM in most schools was classified as type 2 or 3, whereas under strict standards, school FPM was mostly classified as type 3 or 4.

• Korean Journal of Culture and Social Issue
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• v.12 no.4
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• pp.55-75
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• 2006

Most previous research on impression formation has been examined the effects of various informations exclusively within a category, either social category or individual characteristic. The present research examined and compared the priming effects of social category information (we and other) versus personality information (warm and cold) on impression formation. In Study 1, participants primed subliminally with combinations of social category and personality information (we/warm, we/cold, other/warm, and other/cold) were asked to rate faceial pictures on the good-bad and likable-dislikable dimensions. The analysis revealed only the significant main effects of social category information but not any effects of personality information on both the impression dimensions. In Study 2 in which participants were primed with either social category or personality information exclusively, priming of social category information influenced the judgments of likable-dislikable dimension and that of personality information influenced the judgments of good-bad dimension. These results suggest that personality information influences impression in general even though its impacts may be overwritten by social categorical information. The findings were discussed with its implication of everyday's impression formation and the cultural psychological perspectives.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.04a
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• pp.589-595
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• 2013

A reactor vessel internals comprehensive vibration assessment program(RVI CVAP) of an advanced power reactor 1400(APR1400) is being verified on the integrity of RVI for the design life of the plant by performing the non-prototype category-2 type on the US Nuclear Regulatory Commission Guide(NRC RG) 1.20, for which consists of a vibration and stress analysis program, a limited vibration measurement program, an inspection program, and the correlation of these programs. The aim of this paper is to describe the plan for the vibration measurement, test and acceptance criteria portion, and documentation and results of the APR1400 RVI CVAP. We will conduct the limited vibration measurement program of the APR1400 RVI CVAP according to the measurement plan and the vibration measurement testing in this paper.

• Proceedings of the Technology Innovation Conference
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• 2009.02a
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• pp.275-293
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• 2009

국가적으로 국가경쟁력 확보 차원에서 신기술 개발 및 국가전체에서의 미활용기술의 발굴 및 사업화가 추진되고 있다. 건설분야도 아직까지 관련한 기술이 사업화되지 못하고 있는 실정이므로 이러한 기술의 사업화 촉진을 위하여 경제성 분석을 적극적으로 활용할 필요성이 제기되고 있다. 이러한 기술의 경제성 평가영역은 기술 자체에 대한 이해를 전제로 연구개발 및 시장정보, 경제학과 경영학, 산업공학 등 다양한 학문이 모두 융합되는 복합평가영역의 범주에 속하기 때문에 이에 대해 체계적으로 평가체제를 마련하기는 많은 한계가 있다. 특히, 건설기술은 그 분야만의 특이한 특성과 정부주도형, 사회기반적인 시장에 유동적이므로 이러한 부분의 고려가 요구된다. 관련하여 도로 및 교량기술의 사례를 기반으로 기술의 경제성 평가를 수행함으로써 다른 분야와 차별화 되거나 특화되는 부분을 도출, 분석, 정리하고자 한다. 본 연구에서는 건설 기술 가치평가 시 각각의 평가요소에 건설 산업의 특성을 반영하는 방법 및 절차를 정리하고, 현실적으로 고유한 가치평가요소를 추출하여 실무에 활용할 수 있도록 한다.

• The KIPS Transactions:PartD
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• v.12D no.1 s.97
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• pp.13-20
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• 2005

The join operation is an important, fundamental operation in database systems, and it costs much to execute. In the literature, there are a number of technical attempts on development and evaluation of efficient join operations, all of which have been carried out In developers' perspective. This paper proposes a join operations benchmark that is dedicated to the evaluation of the join operations in database systems in users' perspective. This benchmark helps users select a database system that performs the join operations well in their work environment. The benchmark consists of 42 join queries, which are derived from on six performance factors that are picked out in two join categories. We have implemented this benchmark with two commercial database systems. The experimental results are also reported.

• Clean Technology
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• v.15 no.3
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• pp.224-230
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• 2009

Life Cycle Assessment (LCA) has been studied on the reuse of glass bottles. The system boundary in this study encompassed from gate to gate such as production and transportation. A 360 mL volume of a glass bottle was selected as the functional unit. The environmental impact assessments was studied on 6 categories including abiotic resource depletion, acidification, eutrophication, global warming, ozone depletion, and photochemical oxidant creation. The results showed that the most significant impact categories were abiotic resource depletion (48.63%) and global warming (46.27%), and the rest categories revealed insignificant impacts. In the whole system, the chemicals used for the new bottle production revealed the major contribution to the environmental impacts (71.24%), followed by the use of electricity (16.74%) and transportation (11.8%). In addition, the environmental impact of sodium silicate to be put into the stage of the new bottle production was found to be 45.68%, causing severe influence on abiotic resource depletion and global warming.

• Smart Media Journal
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• v.11 no.3
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• pp.54-61
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• 2022

With the increase in the types of information systems managed by public institutions and companies, a security certification system is being implemented in Korea to quickly respond to vulnerabilities that may arise due to insufficient security checks. The korea security evaluation system, such as ISMS-P, performs a systematic security evaluation for each category by dividing the categories for technical inspection items. NIST in the United States has developed SCAP that can create security checklists and automate vulnerability checks, and the security checklists used for SCAP can be written in OVAL. Each manufacturer prepares a security check list and shares it through the SCAP community, but it's difficult to use it in Korea because it is not categorized according to the korea security evaluation system. Therefore, in this paper, we present a mechanism to categorize the OVAL definition, which is an inspection item written in OVAL, to apply SCAP to the korea security evaluation system. It was shown that 189 out of 230 items of the Red Hat 8 STIG file could be applied to the korea security evaluation system, and the statistics of the categorized Redhat definition file could be analyzed to confirm the trend of system vulnerabilities by category.

• Journal of KIISE:Software and Applications
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• v.30 no.3_4
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• pp.259-267
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• 2003

Though naive Bayes text classifiers are widely used because of its simplicity, the techniques for improving performances of these classifiers have been rarely studied. In this paper, we propose and evaluate some general and effective techniques for improving performance of the naive Bayes text classifier. We suggest document model based parameter estimation and document length normalization to alleviate the Problems in the traditional multinomial approach for text classification. In addition, Mutual-Information-weighted naive Bayes text classifier is proposed to increase the effect of highly informative words. Our techniques are evaluated on the Reuters21578 and 20 Newsgroups collections, and significant improvements are obtained over the existing multinomial naive Bayes approach.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1990.10a
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• pp.125-128
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• 1990

조사후 시험시설(Post Irradiated Examination Facility, PIEF)은 내진범주 1 급 구조물로서 현재 각종 실험 및 연구가 진행중인 원자력 안전관련시설물 이다. 한편 이 건물로부터 30m - 120m 정도 떨어져 있는 다목적연구로 (Korea Multipurpose Research Reactor, KMRR) 및 조사재시험시설 (Irradiation Material Examination Facility, IMEF)의 건조사업을 위하여 기 초암반의 굴착작업을 수행할 경우 발파작업에 따른 그 진동 및 폭풍압영향 이 염려되어, 그 안전성 평가를 위하여 시험발파를 수행해야 할 필요가 제기 되었다. 우선 운전중인 원자력안전 시설물에서의 발파에 따른 진동허용 기준 을 설정하고, 둘째로 거리에 따른 폭발량을 경험식에 따라 잠정 결정한 후, 세째로 시험발파에 의한 진동 측정을 수행하여 그 영향을 평가하고, 끝으로 이에 따라 거리별 제한 폭발량을 결정한후 실제 본발파에 적용하고자 한다. 이로써 운전중인 원자력 안전관련시설물인 PIEF의 안전 운전을 도모하고 KMRR및 IMEF 시설의 건조를 원만하게 이룰 수 있을 것이다.

• Korean Journal of Childcare and Education
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• v.9 no.1
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• pp.149-173
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• 2013

The purpose of this study was to examine the experiences of teachers during the development and performance of a nutrition education program based on collaboration between the school organization and local community, as the experiences of teachers who participate in a nutrition education program might be one of major factors to determine the success or failure of their performance. It's basic goal is give some suggestions on school nutrition education and to explore how to assist teachers to ensure their successful performance of a nutrition education program. As a result of analyzing the collected data, the experiences that the teachers had in the program planning stage were subcategorized into two groups: 'finding hope amid complaints' and 'building a learning community'. The experiences that the teachers had in the acting stage were subcategorized ino two groups as well: 'regulating, equalizing and forming a new schema' and 'building stepping stones'. The experiences that they had in the evaluation stage were also subcategorized into two groups: 'finding it rewarding and thankful to teach' and 'new challenge'. The findings of the study are expected to provide essential information on how to assist teachers to offer effective and successful nutrition education.