• Journal of KIISE:Software and Applications
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• v.37 no.8
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• pp.620-628
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• 2010

With the use of the Internet pervasive in everyday life, people are now able to retrieve a lot of information through the web. However, exponential growth in the quantity of information on the web has brought limits to online search engines in their search performance by showing piles and piles of unwanted information. With so much unwanted information, web users nowadays need more time and efforts than in the past to search for needed information. This paper suggests a method of using query expansion in order to quickly bring wanted information to web users. Popularity based Term Weight Mensuration better performance than the TF-IDF and Simple Popularity Term Weight Mensuration to experiments without changes of search subject. When a subject changed during search, Popularity based Term Weight Mensuration's performance change is smaller than others.

• Journal of the Korean Geotechnical Society
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• v.27 no.6
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• pp.49-61
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• 2011

This paper presents the applicability of rheological models for describing fine-laden debris flows and analyzes the flow characteristics as a function of grain size. Two types of soil samples were used: (1) clayey soils - Mediterranean Sea clays and (2) silty soils - iron ore tailings from Newfoundland, Canada. Clayey soil samples show a typical shear thinning behavior but silty soil samples exhibit the transition from shear thinning to the Bingham fluid as shear rate is increased. It may be due to the fact that the determination of yield stress and plastic viscosity is strongly dependent upon interstructrual interaction and strength evolution between soil particles. So grain size effect produces different flow curves. For modeling debris flows that are mainly composed of fine-grained sediments (<0.075 mm), we need the yield stress and plastic viscosity to mimic the flow patterns like shape of deposition, thickness, length of debris flow, and so on. These values correlate with the liquidity index. Thus one can estimate the debris flow mobility if one can measure the physical properties.

• The Korean Journal of Zoology
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• v.37 no.2
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• pp.182-202
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• 1994

마우스(ICR mouse)의 줄생전 ·후 발생에 따른 설점막에서 설유두와 미뢰의 발생, 미뢰를 구성하는 미각세포들의 각 형별 미세구조적인 특징 및 미각세포와 신경종말과의 관계를 광학 및 전자현미경으로 관찰하였다. 유곽유두는 임신 17일 심상유두와 엽상유두는 출생 후 0일, 사상유두는 출생후 1일에 출현하였으며, 유곽유두와 심상유두에서의 미뢰는 출생 후 0일, 엽상유두에서의 미뢰는 출생후 1일에 관찰되었다. 유곽유두에서는 유두벽 상피 뿐만 아니라 유두 표면상피에서도 성체에서와는 다르게 미뢰가 출현하였다. 출생후 7일과 15일에서 유곽유두의 미뢰에 대한 미세구조적 관찰에서 미각세포는 중간형 세포. 암세포, 명세포, 기저세포 및 주변세포로 구분되었다 중간형 세포는 암세포와 명세포의 중간정도의 전자밀도를 보이는 세포로서 세포질에서는 활면 및 조면소포체가 다수 관찰되었고. 세포질 및 핵질내에서 다소포성소체와 유사한 구조물들이 관찰되었다. 암세포는 전자밀도가 높아 어둡게 보였고. 핵막은 깊은 함입을 보였다 이 세포의 핵주변 세포질에는 미토콘드리아, 섬유상 물질, 조면소포체 및 폴리솜들이 다수 관찰되었으며, 첨부 세포질에서는 전자밀도가 높아 어둡게 보이는 과립들이 다수 관찰되었다. 명세포는 전자밀도가 낮아 밝게 보였고, 크고 등근 핵을 갖고 있었으며. 세포질내에서 활면소포체, 폴리솜 그리고 크고 작은 공포들이 다수, 조면소포체들은 소수 관찰되었다. 기저세포는 핵질이 풍부한 난원형의 핵을 갖고 있었으며, 전자밀도가 낮아 밝게 보였고, 유리리보솜들은 많았으나, 활면 및 조면소포체들은 소수 관찰되었다 주변세포는 비교적 긴 방추형의 세포로 얕은 핵막 함입들을 보였고, 대부분의 세포소기 관들은 미약하였으나 유리리보솜들은 다소 많이 관찰되었다. 출생후 7일에는 명세포, 15일에는 중간형 세포들이 다른 세포에 비하여 다수 출현하였다 출생후 미각세포들의 형태적 특징 및 세포소기 관들의 분화들로 미루어 암세포 주변세포 및 기저세포는 미성숙세포, 중간형 세포는 미각기능이 활발한 성숙한 세포 그리고 명세포는 퇴행성 세포로 생각된다.

• 한국사회정책
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• v.25 no.2
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• pp.305-332
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• 2018

This study explores the effectiveness of employment-oriented welfare state by analyzing the mediating role of employment rate on the relationship between public welfare effort and fiscal soundness. Notably, this study considers the quality of employment into the analysis: part-time work, involuntary part-time work and low-wage work in analysis. The data sample consists of 18 OECD countries which initiated employment-oriented welfare strategy after the crisis of welfare state. An analysis was conduct based on Baron & Kenny(1986)'s method and panel two-stage model to handle the endogeneity problem. The results show that while the high level of public welfare effort negatively affects the fiscal soundness if it contributes to boosting employment rates, it has positive effects on the fiscal soundness. However, when the incidence of involuntary part-time employment and low-wage employment is high, the mediating impact of employment rate on the fiscal soundness disappears. This study argues that unless the quality of employment is taken into consideration, the positive effect of employment-oriented welfare state strategy to improve the fiscal soundness is not fully guaranteed.

• Journal of the Korean Electrochemical Society
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• v.24 no.4
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• pp.113-119
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• 2021

In this study, impurity free V^3.5+ electrolytes were prepared using formic acid as a reducing agent and PtD/C as a catalyst and it was applied to VRFB. The well-oriented 3D dendrite structure of the PtD/C catalyst showed high catalytic activity in formic acid oxidation reaction and vanadium reduction reaction. As a result, the conversion ratio of electrolyte using the PtD/C was 2.73 mol g^-1 h^-1, which was higher than that of 1.67 mol g^-1 h^-1 of Pt/C prepared by the polyol method. In addition, in the VRFB charging and discharging experiment, the V^3.5+ electrolyte produced by the catalytic reaction showed the same performance as the standard V^3.5+ electrolyte prepared by the electrolytic method, thus proving that it can be used as an electrolyte for VRFB.

• The Journal of Korean Association of Computer Education
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• v.12 no.2
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• pp.33-45
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• 2009

We can communicate with each other using notice board, questions & answers boards, messages in the web-based learning system, especially questions & answers board are the places that can be shared with the learning experiences between the learners and improve one's learning efficiency. In this study, we found out the problems when studying the learning contents and learning questions & answers boards in the web-based learning system and proposed a web-based learning system consisted of learning contents and the questions & answers boards with ability for searching automatically and providing questions & answers that is related with the learning contents. According to the result of the effectiveness and accuracy analysis, the proposed web-based learning system can be very useful and improve one's learning achievements by searching exactly the learning questions & answers.

• Journal of KIISE:Databases
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• v.34 no.3
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• pp.270-281
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• 2007

Recently, there has been growing interest in streaming XML data. Much of the work on streaming XML data has been focused on efficient filtering of XML data. Such XML filtering systems deliver XML documents to interested users. The burden of extracting the XML fragments of interest from XML documents is placed on users. As a result, several evaluation techniques for streaming XML data, which only extract interested XML fragments by directly evaluating XML queries on streaming XML data, have been proposed. However, existing evaluation techniques for streaming XML data only support the restricted subset of XPath queries, and multiple queries cannot be evaluated by such evaluation techniques. In this paper, we propose XTREAM which evaluates multiple queries in conjunction with the read-once nature of streaming data. In contrast to the previous work, XTREAM supports a wide class of XPath queries including order based predicates and so on. Experimental results with real-life and synthetic XML data demonstrate the efficiency and scalability of XTREAM.

• Journal of the Korea Convergence Society
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• v.9 no.11
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• pp.443-454
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• 2018

The purpose of this convergence study was to evaluate and to identify predictors of health-related quality of life(HRQoL) of families with cancer survivor(FCS) focusing on the comparison of families with cancer patient(FCP) receiving treatments. The research was conducted with the data for 153 FCS and 115 FCP taken from the 6th wave of the Korea National Health and Nutrition Examination Survey. The independent variables included socio-demographic, health related, psychological and social factors. The data were analyzed by hierarchical multiple regression analysis using SPSS/WIN 18.0. The results showed different patterns of predictors on the HRQoL of FCS and FCP. In FCS, the statistically significant factors were stress(${\beta}=-.192$, p<.05) and exclusion from economic activities(${\beta}=-.191$, p<.05). Therefore, families of cancer patients also need appropriate interventions for each stage of the disease.

• KIPS Transactions on Software and Data Engineering
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• v.10 no.6
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• pp.223-234
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• 2021

Recent advances in the 4th Industrial Revolution have accelerated the change of the shopping behavior from offline to online. Search queries show customers' information needs most intensively in online shopping. However, there are not many search query research in the field of search, and most of the prior research in the field of search query research has been studied on a limited topic and data-based basis based on researchers' qualitative judgment. To this end, this study defines the type of search query with data-based quantitative methodology by applying machine learning to search research query field to define the 15 topics of search query by conducting topic modeling based on search query and clicked document information. Furthermore, we present a new classification system of new search query types representing searching behavior characteristics by extracting key variables through principal component analysis and analyzing. The results of this study are expected to contribute to the establishment of effective search services and the development of search systems.

• The Mathematical Education
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• v.61 no.1
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• pp.179-198
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• 2022

Teaching is delicate, complicated, and demanding work, and especially beginning teachers set forth their difficulties in preparing and implementing mathematics instruction. It is important to ensure the quality of beginning mathematics teachers' instruction above a consistent level because such affirmation justifies the national policy on teacher education as well as the individual efforts of preservice teachers in South Korea. The current study collected mathematics lessons of the two beginning teachers who graduated from the same teacher training institute and worked at the same high school. The findings reported what features their lessons have with regard to the learning environment, engaging students in learning, deepening student learning, and using representations of the edTPA in order to identify what can or cannot be expected in their mathematics instruction. The instruction of the one teacher was assessed middle or more than middle scores throughout the rubrics, but the other one had lower scores. Based on these findings, this study suggested the implications for teacher education in ways of improving the quality of instruction of beginning mathematics teachers.