• The Journal of Society for e-Business Studies
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• v.17 no.2
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• pp.129-147
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• 2012

Collaborative filtering (CF), one of the most successful recommendation techniques, has been used in a number of different applications such as recommending web pages, movies, music, articles and products. One of the critical issues in CF is why recommendation performances are different depending on application domains. However, prior literatures have focused on only data characteristics to explain the origin of the difference. Scant attentions have been paid to provide systematic explanation on the issue. To fill this research gap, this study attempts to systematically explain why recommendation performances are different using structural indexes of social network. For this purpose, we developed hypotheses regarding the relationships between structural indexes of social network and recommendation performance of collaboration filtering, and empirically tested them. Results of this study showed that density and inconclusiveness positively affected recommendation performance while clustering coefficient negatively affected it. This study can be used as stepping stone for understanding collaborative filtering recommendation performance. Furthermore, it might be helpful for managers to decide whether they adopt recommendation systems.

• Journal of the Korean Institute of Landscape Architecture
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• v.45 no.1
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• pp.63-72
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• 2017

Gardening activities, plant raising, and general flowerbeds the public makes today can be found in the original form of cottage gardens in the United Kingdom. A cottage garden is a popular garden style of modern Britain, implying unique Englishness including ethnic sense and vernacular. In addition, the purpose of this study is to consider the modern movement in the United Kingdom in the past 200 years and read Englishness of cottage gardens through style differentiation and background of occurrence of cottage gardens appearing in this process. Therefore, this study is summarized as follows. First, a view of nature of the Englishman loving freedom and landscape acts as a key part of patriotism and is connected to the preservation of idyllic England. For this ideal of the Englishman of the country, idyllic British characteristics are found in various literatures and artistic fruits; cottage gardens, that is a form of new garden, were made with invigoration of supply and collection of plants. Second, an early form of cottage gardens was the domestic garden, in which there is a vegetable garden by middle-class move to a suburb according to urbanization, but evolved into a form of garden having both artistry and regionality, vernacular, and ecological characteristics with various situations of modern society(handicraft promotion movement, preservation of remains, and ancient building restoration movement). Wild gardens occurring in this process are a type of garden realizing wild fields and forests in the United Kingdom;they have made a big impact on many garden designers up to now. Cottage gardens, reflecting a variety of Englishness, is a subject of city planning and flower shows and is a culture symbolizing the United Kingdom.

• Korean Journal of Acupuncture
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• v.28 no.1
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• pp.91-100
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• 2011

Objectives : To classify needling or moxibustion-prohibited acupoints in Emergency Formulas Worth a Thousand in Gold (EFWTG) and Supplement to the Formulas Worth a Thousand in Gold (SFWTG). Methods : We found needling or moxibustion-prohibited acupoints in EFWTG and SFWTG, then investigated the influences of needling or moxibustion-prohibited acupoints on A-B Classic of Acupuncture and Moxibustion. Results : In EFWTG, the needling-prohibited points were LI13, ST17, BL56, TE8, CV8, CV15 and GV24. Acupoints needed careful needling were LU2, ST12, KI2, KI7, TE19, GB3 and jwagak. The moxibustion-prohibited points were LU3, LU8, ST1, ST8, ST9, ST17, ST32, ST33, BL6, BL30, TE18, TE23, GB33, GB42, CV5, CV15, GV6, GV15, GV16 and GV17. Acupoints needed careful moxibustion were ST7, ST30, TE21 and GB22. In SFWTG, the needling-prohibited points were LU2, LI13, ST12, ST17, ST32, BL56, KI2, KI7, TE8, TE19, GB3, CV8, CV15, GV24 and jwagak. The moxibustion-prohibited points were LU3, LU8, ST1, ST7, ST8, ST9, ST17, ST30, ST32, ST33, BL6, BL30, TE18, TE23, GB22, GB33, GB42, CV5, CV15, GV6, GV15, GV16, GV17 and ijung. Conclusions : There were 7 needling-prohibited points, 7 acupoints needed careful needling, 20 moxibustion-prohibited points, and 4 acupoints needed careful needling in EFWTG, and 15 needling-prohibited points and 24 moxibustion-prohibited points in SFWTG. The needling or moxibustion-prohibited acupoints in A-B Classic of Acupuncture and Moxibustion had a strong influence on those in the two literatures.

• Journal of Gifted/Talented Education
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• v.18 no.3
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• pp.543-568
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• 2008

The study attempted to articulate standpoints towards compulsory education system based on schooling age and year in careful considerations with the gifted. For these ends, literatures were reviewed and various education laws, regulations and documents and related law reports and judicial decisions were investigated. Literature review was conducted to develop that ideas of rights to compulsory education for regular students are closely related to those for gifted. Structures of general education laws and gifted education law and regulations were compared. Later, limitations of compulsory education were discussed when it was applied for the gifted. In conclusions, it is inappropriate that the gifted are ruled by compulsory education system based on schooling age. If compulsory education system is designated to provide an effective opportunity for all students, it should be duties and rights to enter elementary schools at schooling age. However, it appeared that the duties and rights to enter elementary schools at certain schooling ages function as inhibitors against the gifted with giftedness and potentials far beyond those of regular students. Therefore, the gifted should be separately ruled under flexible systems of compulsory education if their achievement level is assessed as sufficient to enter elementary schools before schooling age. On the other hand, legal systems of compulsory education are gradually evolved to flexible systems. However, it is necessary to establish social atmosphere and support system of educational administration in order to practice the flexible system of compulsory education for the gifted.

• Journal of Korea Society of Industrial Information Systems
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• v.12 no.4
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• pp.138-147
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• 2007

Metabolic pathway is a series of chemical reactions occuning within a cell and can be used for drug development and understanding of life phenomenon. Many biologists are trying to extract metabolic pathway information from huge literatures for their metabolic-circuit regulation study. We propose a text-mining technique based on the keyword and pattern. Proposed technique utilizes a web robot to collect huge papers and stores them into a local database. We use gene ontology to increase compound recognition rate and NCBI Tokenizer library to recognize useful information without compound destruction. Furthermore, we obtain useful sentence patterns representing metabolic pathway from papers and KEGG database. We have extracted 66 patterns in 20,000 documents for Glycosphingolipid species from KEGG, a representative metabolic database. We verify our system for nineteen compounds in Glycosphingolipid species. The result shows that the recall is 95.1%, the precision 96.3%, and the processing time 15 seconds. Proposed text mining system is expected to be used for metabolic pathway reconstruction.

• Journal of Conservation Science
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• v.27 no.1
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• pp.31-40
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• 2011

Copper-red (Dongwha, Jinsa) is Korean traditional inorganic pigment used for red-coloring on the porcelain surface during Goryeo and Joseon Periods. Trace amounts of copper-red porcelains are handed down because of the technical difficulty of making and coloring of the pigment. It is known that copper ore sources were extensively distributed in Korea according to old literatures and some of them are still producing copper ore at this present. Main types of copper-bearing mineral in Korea are chalcopyrite ($CuFeS_2$) and malachite ($Cu_2CO_3(OH)_2$), and they are easily collected from the ground surface. This means Korea had geographical and economic geological advantages for supplying raw material of the pigment. These two minerals showed good red-coloring in color test for porcelain pigment. As a coloring element, copper showed micro size less than $5{\mu}m$ in diameter in glaze matrix. The dispersion of copper particle is the most decisive factor for red chromaticity of copper-red porcelain, as well as copper content of the pigment.

• Journal of Korean Society of Environmental Engineers
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• v.31 no.2
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• pp.125-131
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• 2009

Reductive dechlorination of polychlorinated dibenzo-p-dioxins (PCDDs) and its toxicity change were predicted by the linear free energy relationship (LFER) model to assess the zero-valent iron (ZVI) and anaerobic dechlorinating bacteria (ADB) as electron donors in PCDDs dechlorination. Reductive dechlorination of PCDDs involves 256 reactions linking 76 congeners with highly variable toxicities, so is challenging to assess the overall effect of this process on the environmental impact of PCDD contamination. The Gibbs free energies of PCDDs in aqueous solution were updated to density functional theory (DFT) calculation level from thermodynamic results of literatures. All of dechlorination kinetics of PCDDs was evaluated from the linear correlation between the experimental dechlorination kinetics of PCDDs and the calculated thermodynamics of PCDDs. As a result, it was predicted that over 100 years would be taken for the complete dechlorination of octachlorinated dibenzo-p-dioxin (OCDD) to non-chlorinated compound (dibenzo-p-dioxin, DD), and the toxic equivalent quantity (TEQ) of PCDDs could increase to 10 times larger from initial TEQ with the dechlorination process. The results imply that the single reductive dechlorination using ZVI or ADB is not suitable for the treatment strategy of PCDDs contaminated soil, sediment and fly ash. This LFER approach is applicable for the prediction of dechlorination process for organohalogen compounds and for the assessment of electron donating system for treatment strategies.

• The Journal of the Korea Contents Association
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• v.15 no.5
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• pp.620-629
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• 2015

As the construction industry becomes bigger and more complicated, standardization of terms should be established between academic and industrial fields in order to accumulate and share information technology. The aim of this study is to investigate and analyze the research trends and actual usage of construction and architectural terms in Korea. For this purpose, we examined research related to construction and architectural terms by searching RISS up to August 2014. We also analyzed document types and contents of research by year. As a result, 130 research studies related to construction and architectural terms were searched. Of document types, glossary ranks the highest, followed by academic journal papers, master's theses and research reports. Research related to construction and architectural terms began in 1939, and was actively studied between the mid-1980s to the mid-1990s. Within the research, list and opinion of related construction and architectural terms are found the most frequently, followed by standardization, analysis, alteration, dictionary and wordbook, and search system of terms. Despite these efforts and research, standardization of terms has not yet been consolidated between academic and industrial fields. Therefor, we suggest six proposals in order to standardize the terms. This study is an attempt to see the trends and conditions of construction and architectural terms and to provide base-line data and an insight for future research.

• Korean Journal of Child Education & Care
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• v.17 no.3
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• pp.49-63
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• 2017

This study aims to investigate the effect of early childhood teachers' mathematical attitude on their mathematics teaching efficacy and to prove the moderating role of pedagogical content knowledge (PCK) in mathematics, which we selected based upon previous literatures. To explore the effect of early childhood teachers' mathematical attitude on their mathematics teaching efficacy and the moderating role of PCK in mathematics between them, This study randomly sampled 500 early childhood teachers who work at child care centers and kindergartens in Seoul, Kyunggi province and Kangwon province and collected their responses by questionnaires. Mathematics teaching efficacy was measured with mathematics teaching efficacy scale for early childhood teachers developed by Luo (2000) and translated by Jung (2001a). Mathematical attitude was measured with Smith (2000)'s scale which we translated for this study. To measure the pedagogical content knowledge in mathematics, we revised Hong(2012)'s scale to be applicable for early childhood teachers. Direct effect of mathematical attitude on mathematics teaching efficacy and the moderating effect of PCK in mathematics were analyzed by multiple regression analysis using IBM SPSS 21.0. Study results demonstrated the significant direct effect of mathematical attitude on mathematics teaching efficacy. Also, the moderating effect of PCK in mathematics was also proved to be significant. That is, if the teacher has high level of pedagogical content knowledge in mathematics, the positive effect of mathematical attitude on mathematics teaching efficacy was even more enhanced. This results supports the current finding where PCK in mathematics functions as a moderating variable between mathematical attitude and mathematics teaching efficacy. Thus, our study is expected to provide relevant contents that should be covered during teacher education, which aims to improve early childhood teachers' mathematics teaching efficacy.

• Spatial Information Research
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• v.21 no.4
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• pp.47-62
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• 2013

Recently there are growing arguments about the needs to improve Cadastral Resurvey Projects more efficiently and rationally since the projects have realistically started. This study aims to analysis some problems of the projects and finds out the solutions. With this purpose, we have surveyed some literatures related to the demonstration projects, and then have examined some similar domestic urban development projects and international Cadastral Resurvey Projects in order to apply their appropriate tools to the present or future projects. Generally the execution process of Cadastral Resurvey Projects has four steps and this study arranges the main problems in each steps. In the result it suggests that some improvements should change as the followings. (1) It is more effective to take planning-based approach than project-based one. (2) The project boundary needs to be decided with the rectangular patterns not the irregular ones for the efficient project. (3) The adjusting the current baseline of agreement should be reconsidered because too high baseline may make the project difficult to progress. (4) Not only systematical public relations to promote the projects but also a variety of incentives to induce the public participations is very important to solve the problems of involvement. (5) Institutional tools for collaborate planning is also desirable to solve the conflicts among stakeholders rationally and effectively.