• The Korean Journal of Archival Studies
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• no.51
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• pp.337-375
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• 2017

The Agency of Employment and Labor produces various records that are related to labor history subject while performing its functions such as labor supervision. Some valuable records were discarded even if they are worthy enough to be researched from a historical perspective. Thus, this article contributes to classifying the main subjects and the main agents of an action in view of macrohistory and microhistory. Some examples of the records that require prolonged preservation were also presented by each issue. Furthermore, this article proposes a dramatic improvement of the records schedule. It also presents other issues as the foundation of the valuation standard based on the subject including the conversion of the strategy of archival appraisal, and selection that combines the function and the subject.

• The Journal of Korean Association of Computer Education
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• v.19 no.3
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• pp.11-19
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• 2016

Enhancement of computing education became an international phenominon including South Korea's revised national curriculum 2015. As the enhancement begins to focus on universal computing education, researches to investigate long-term effect of the enhancement is needed. To explore whether the reinforced computing education will bring which long-term impacts, this study investigated university students' experience on computer subject in their secondary schools, and major selection and achievement in a college computing course. As results, there was no statistically significant relation of taking the computer subject per se and major selection and achievement, but significant relation between contents of the subject, and major selection and achievement. This study has limitation on design and results lacking longitudinal data but contributes emphasizing need of longitudinal study to measure long-term effect of enhancement of computing education and providing clues of what impact it would bring.

• Journal of Information Processing Systems
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• v.19 no.5
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• pp.652-662
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• 2023

Identifying highly discriminating genes is a critical step in tumor recognition tasks based on microarray gene expression profile data and machine learning. Gene selection based on tree models has been the subject of several studies. However, these methods are based on a single-tree model, often not robust to ultra-highdimensional microarray datasets, resulting in the loss of useful information and unsatisfactory classification accuracy. Motivated by the limitations of single-tree-based gene selection, in this study, ensemble gene selection methods based on multiple-tree models were studied to improve the classification performance of tumor identification. Specifically, we selected the three most representative tree models: ID3, random forest, and gradient boosting decision tree. Each tree model selects top-n genes from the microarray dataset based on its intrinsic mechanism. Subsequently, three ensemble gene selection methods were investigated, namely multipletree model intersection, multiple-tree module union, and multiple-tree module cross-union, were investigated. Experimental results on five benchmark public microarray gene expression datasets proved that the multiple tree module union is significantly superior to gene selection based on a single tree model and other competitive gene selection methods in classification accuracy.

• Genomics & Informatics
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• v.10 no.2
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• pp.81-87
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• 2012

Large-scale copy number variants (CNVs) in the human provide the raw material for delineating population differences, as natural selection may have affected at least some of the CNVs thus far discovered. Although the examination of relatively large numbers of specific ethnic groups has recently started in regard to inter-ethnic group differences in CNVs, identifying and understanding particular instances of natural selection have not been performed. The traditional $F_{ST}$ measure, obtained from differences in allele frequencies between populations, has been used to identify CNVs loci subject to geographically varying selection. Here, we review advances and the application of multinomial-Dirichlet likelihood methods of inference for identifying genome regions that have been subject to natural selection with the $F_{ST}$ estimates. The contents of presentation are not new; however, this review clarifies how the application of the methods to CNV data, which remains largely unexplored, is possible. A hierarchical Bayesian method, which is implemented via Markov Chain Monte Carlo, estimates locus-specific $F_{ST}$ and can identify outlying CNVs loci with large values of FST. By applying this Bayesian method to the publicly available CNV data, we identified the CNV loci that show signals of natural selection, which may elucidate the genetic basis of human disease and diversity.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.17 no.1
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• pp.63-79
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• 2006

This study suggested the necessity of subject access for understanding on the contents of children's books which library would select children's books efficiently. Especially it was presented examples of efficiency on subject access analyzing Korean translation fiction of Newbery Medal Winner's books. Besides subject on the contents of books, it suggested fiction genre and gender and age of protagonist as elements which should be taken into account in process of Subject Headings development.

• Hwankyungkyoyuk
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• v.17 no.1
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• pp.101-111
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• 2004

The selection rates of Environmental subject have been increasing since the environmental subject was made. Although the quantitative growth, environmental subject is not acknowledged yet in many schools in Korea. Most of environmental teachers teach two subjects; main subject on their own major and environmental subject. In this respect, this qualitative case study aims to show the influence of teachers' charge on environmental class or environmental subject. In the case study, Teacher 'A' takes charge one subject; Environmet, and teacher 'B' takes charge two subjects; Social Study and Environment. Teacher 'A' took some current issues such as SARS(Severe Acute Respiratory Syndrome) and Saemangum project, and uses various instructional methods and instruments. On the other hand, teacher 'B' might not choose the current issues, or usually gives up various instructional methods and instruments because of lack of time. Although they have those differences on the instruction, the teachers 'A' and 'B' both agreed to the importance of Environmental Education as well as they did their best to prepare for class on environmental subject. As a result, all these outcomes show teachers need to be responsible for single subject on environment as teachers' interests seriously affect to environmental subject and class.

• The Korean Journal of Financial Management
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• v.22 no.2
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• pp.213-226
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• 2005

Adverse selection is a heavily scrutinized subject within the financial intermediary industry. Consensus is reached regarding its effect on the loan interest rate. Despite the similar features of financial service offered by the credit card, we still have controversy regarding credit card interest rate on how is adverse selection incurred with the change of interest rate. Thus, this paper explores how does the adverse selection, if ever, take place and affect the credit card interest rate. Information asymmetry regarding the credit card users' type represented by the default probability is assumed. The users are assumed to be rational in that they want to minimize the per unit dollar expense associated with the commercial transaction and financing between the two typical payment methods, cash and credit card. Suppliers, i.e. credit card companies, would like to maximize their profit and would be better off with more pervasive use of credit cards over the cash. Then we could show that the increasing credit card interest rate is subject to the adverse selection, sharing the same tenet with that of the bank loan interest rate proposed by Stiglitz and Weiss. Hence the current theory predicts that credit card market also suffers from adverse selection with increasing interest rate.

• Journal of Communications and Networks
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• v.18 no.3
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• pp.320-326
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• 2016

In existing literature on multiple-input multiple-output (MIMO) relaying communication systems, antenna selection is often implemented by maximizing the channel capacity or the output single-to-noise ratio (SNR). In this paper, we propose an energy-efficient low-complexity antenna selection scheme for MIMO relaying communication systems. The proposed algorithm is based on beamforming and maximizing the Frobenius norm to jointly optimize the transmit power, number of active antennas, and antenna subsets at the source, relaying and destination. We maximize the energy efficiency between the link of source to relay and the link of relay to destination to obtain the maximum energy efficiency of the system, subject to the SNR constraint. Compared to existing antenna selection methods forMIMO relaying communication systems, simulation results demonstrate that the proposed method can save more power in term of energy efficiency, while having lower computational complexity.

• Journal of Korean society of Dental Hygiene
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• v.6 no.2
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• pp.115-127
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• 2006

A purpose of this study is degree of recognition and consciousness investigation about a satisfaction duty before admission about a school subject of some academic dental hygiene students. From responses to individual written survey questionnaires answered by 608 students who are studying Dental Hygiene at colleges in Mokpo, Iksan, Gangneung. The following are the results regarding their satisfaction levels with their majors and their interest in working abroad: 1. Regarding the motivating factors to major in Dental Hygiene, most students(51.3%), particularly most freshmen(57.3%), have chosen this major because of more job opportunities than students with other majors. The most common source of information in choosing majors is the Internet(30.8%). 2. Most students do not want to change their majors even if they are provided with the chance to do so(65.5%). They are in general satisfied with their studies. The result shows that the Dental Hygiene majors are positive toward their major. 3. Most students will choose their jobs by their own choices(40.6%), and the most important factor in their choices is the opportunity of self-growth and development(33.1%). The survey results show that the Dental Hygiene students value their own decisions and self-realization. 4. Showed the difference that as a result of having seen a knowledge degree advance a school subject of major in Dental Hygiene by a school year and ash students, an admission motive, relevance of an information acquisition path, all noted. 5. And were able to see the difference that noted in an adviser, work selection bases in case of work selection whether or not there was a dissatisfaction reason about a major and a criminal record.

• The Journal of the Korea Contents Association
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• v.12 no.8
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• pp.136-145
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• 2012

The purpose of this study is to examine the effect of Korean dramas selection factors for Chinese audiences on the national image of South Korea. The results of this study were as follows: First, selection factors of Korean dramas for Chinese audiences were categorized 'subject and content', 'direction and background music', and 'style of actor or actress'. Among these factors, this study was found that a factor of drama's 'subject and content' had an effect on the selection of Korean dramas for Chinese audiences. Second, 'touristic factor', 'cultural factor', and 'stylistic factor' were examined as a national image factor of South Korea for Chinese audiences. The Chinese audiences surveyed responded positively on 'cultural factor'. The images delivered through the Korean TV dramas have very much influenced the Chinese audiences to view contemporary Korean society as a country of modern and urban elegance. Furthermore, the audiences cognized South Korea is a friendly nation as South Korea and China has a similar cultural background like the Confucian culture. Third, the study found selection factors of Korean dramas for Chinese audiences had positive effects on the national image of South Korean. These positive influences were found on 'touristic factor', 'cultural factor', and 'stylistic factor' From these results, Chinese audiences watch Korean dramas focused on 'subject and content', 'direction and background music', and 'style of actor or actress'. Watching Korean dramas help to create the friendly national image of South Korea. The study shows a possibility to increase an interest and preference on the Korean pop culture.