• Journal of the Korea Society of Computer and Information
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• v.10 no.1 s.33
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• pp.7-14
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• 2005

An OLAP(On-Line Analytical Processing) system is the decision support tool with which a user can analyze the information interactively in the various aspects. However, the traditional existing construction of an OLAP system has the inefficiency Problem of increasing the processing time and cost caused by the use of complex MDX(Multidimensional Expressions) queries. In an attempt to solve this problem, a new concept of data structuring technique, where a unit column whose elements are all 1 is added to the fact table, was suggested. With the data structuring technique, we can reduce the processing time and cost in OLAP systems.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.36-36
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• 2022

2010년대 후반에 딥 러닝 관련 기술이 발전하고 복잡한 강우-유출 현상을 모의하는데 적합하다는 점이 알려지면서 많은 수문관련 연구에서 딥러닝 기법을 통하여 수문모델링을 대체 가능함을 제시하여 왔다. 그러나, 이러한 가능성은 단순 모의효율을 통한 분석이므로 실제 수문관리 현장에 대한 적용을 위한 고찰이 필요한 시점이다. 이에 본 연구에서는 딥러닝 기법을 통하여 수문모의의 가능성을 고찰하고 개선점을 고찰하고자 한다. 이를 위하여 수문자료에 많이 적용되는 LSTM 기법과 수문모형인 TANK모형을 이용하여 경상남도의 형산강 유역을 대상으로 2013년부터 2020년까지의 유출량을 모의하고 그 결과를 비교 분석하였다. 형산강 유역에 대한 수문모의를 수행한 결과, LSTM 기법을 이용한 수문모의가 TANK모형에 비하여 높은 모의효율을 보여주었다. 그러나, 높은 모의효율에도 불구하고 유역의 물리적인 강우-유출과정을 모사하는 수문모형과 달리 LSTM 기법은 인간이 이해할 수 없는 과정을 통하여 학습하고 구조화되므로 기존과 다른 경향의 입력자료로 인한 예측오류가 발생할 가능성과 그에 따른 인간의 판단불가에 따른 문제를 내포하고 있음을 고찰하였다. 따라서, 딥러닝을 이용하여 수문모델링 분야에 수문모형을 전면적으로 대체하기에는 어려움이 있을 것이다. 본 연구에서는 현재까지의 딥러닝을 이용하여 수문모형을 대체하기 위해서는 ① 국민의 생활에 직접적으로 영향을 미치는 분야가 아닌 단순 연구목적이나 위험성 분석 등에 적용하거나, ② 딥러닝의 모의결과에 대해 사용자가 검토하거나 판단할 수 있는 의사결정 체계를 구축하거나, ③ 도출된 결과에 대한 윤리적 검토나 책임소재에 대한 사회적 합의 등이 선결되어야 할 것이다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.5
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• pp.61-69
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• 2017

The study on interference channel is very important information theoretically and many studies have been done on it. However, even in the simplest case, even in the case of two user interfering channels, the channel capacity is not yet known except in special cases. Recently, research on the multiplexing gain that shows the tendency of the transmission rate in the high signal to noise ratio (SNR) band has been actively carried out, instead of accurately grasping the channel capacity. Obtaining optimal multiplexing gain can reveal trends in channel capacity at high signal-to-noise ratio bands. In an interfering channel with two users, the best multiplexing gain can be obtained by eliminating the interference. However, recent research shows that when the number of users is more than three, the optimal multiplexing gain can not be obtained only by zero forcing and a new technique called interference sorting is needed. There are two types of interference sorting techniques. Beamforming A method of effectively separating signals and interference by properly selecting matrices and constructing structured codes using rational numbers and irrational numbers. The interference alignment technique can achieve optimal multiplexing gain in various environments such as interference channel, X channel, compound broadcast channel, and multi hop network for multi source multi destination. In recent years, it has also been applied to distributed storage. Lee et al., "Lattice Code Interference Alignment in Cooperative Multipoint Transmission (COMP) for Interference Channels of Three Users", Journal of the Institute of Electronics Engineers, vol.49-TC,no.6,2012. In this paper, the DoF of delayed channel information is obtained.

• Journal of Music and Human Behavior
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• v.3 no.1
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• pp.63-76
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• 2006

Melody is defined as adding spatial dimension to the rhythm which is temporal concept. Being able to understand melodic pattern and to reproduce the pattern also requires cognitive skills. Since 1980, there has been much research on the relationship between academic skills and music cognitive skills, and how to transfer the skills learned in music work to the academic learning. The study purported to examine various research outcomes dealing with the correlational and causal relationships between musical and academic skills. The two dominating theories explaining the connection between two skills ares are "neural theory" and "near transfer theory." The theories focus mainly on the transference of spatial and temporal reasoning which are reinforced in the musical learning. The study reviewed the existing meta-analysis studies, which provided evidence for positive correlation between academic and musical skills, and significance of musical learning in academic skills. The study further examined specific skills area that musical learning is correlated, such as mathematics and reading. The research stated that among many mathematical concepts, proportional topics have the strongest correlation with musical skills. Also with reading, temporal processing also has strong relationship with auditory skills and motor skills, and further affect language and literacy ability. The study suggest that skills learned in the musical work can be transferred to other areas of learning and structured music activities may be every efficient for children for facilitating academic concepts.

• (The) Korean Journal of Educational Psychology
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• v.32 no.1
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• pp.1-27
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• 2018

The proposes of this study were to develop the learning consulting model based on creative problem solving and to verify the effects of its implementation. The model was developed based on ADDIE program developing model. In the analysis stage, literature review and needs survey were conducted for data collection on learning consulting at universities including the literature in related fields. Specific areas needed in the learning consulting model were selected from the results of this collected data. During the design and development stage, the learning consulting processes were established. These constituted the learning consulting model developed and it had been based on the Creative Problem Solving. To verify the validity of the learning consulting model based on the creative problem solving, a pilot study was implemented. The model was completed content a validity verification process performed by experts through focus group interviews. The aim this final model is to improve the self-directed learning ability and creative problem solving capacity of the university students. The study results showed that mean scores on self-directed learning ability of the experimental group increased significantly compared to the control group. Based on these findings, the learning consulting model seemed very effective in improving the university students' self-directed learning ability, as well as their creative problem solving capacity. Based on the results of this study, implications and limitations of the final model and its implementation were discussed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.8
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• pp.3547-3554
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• 2011

The aim of this study is to take hold of the present situation as well as the perspective of the domestic alcohol specialized hospitals. The structured questionnaire was prepared to understand the type of services, manpower and systematic programs. Among eight hospitals that stand for the alcohol addiction specialized hospitals, six hospitals agreed to participate in the survey, which was made from Jun. 17 to July 15, 2010. The average number of beds of the surveyed hospitals was 208. They were mostly private ones(66.7%), located in urban area(50%), and had experiences of alcohol treatment less than five years(50%). While all of them practiced both the inpatient and outpatient services, only 33% provided the systematic outpatient program that was at least 2 or 3 hours per week. All hospitals practiced the physical and individual psychological evaluations, but only 16.1% had the daytime programs. The beds of protective ward were 72% of all beds, and the beds of night and day occupied 7.6% and 2.6% respectively. It was found that although the average number of mental health social worker and mental health nurse was larger than that required in the regulation of mental health law there are significant deviations between hospitals. However, the manpower of psychiatrists and nurses were comparatively large. The first problem indicated by clinical experts was the patient's refusal of care, which results in an inefficiency in the treatment. The next problem was the lack of local health care institutions that can attend on the discharged patients were important issues. Also the low reimbursement and indifferences to the alcohol abuse were considered as important issues.

• Journal of agricultural medicine and community health
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• v.29 no.1
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• pp.43-63
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• 2004

Objectives: The purpose of this study was to classify the patterns of health behaviors of some rural residents in Korea by sub-grouping them into populations with similar patterns of diet quality, physical activity, alcohol consumption and cigarette smoking, and then to investigate the relationship between these health behavior patterns and health status or health management of them. Methods: The study subjects were 722 rural residents above 20 years old on a typical rural district in Korea, and the data used in this study was from the survey data for health planning of a health center. Study questionnaire for this survey was developed from modifying the questionnaire for 'National Nutrition and Health Study' conducted in 1998. To classify health behavior patterns, cluster analysis was conducted. And to test the association of health behavior patterns with health status or health management, multiple logistic regression analysis were conducted. Results: The results and their implications of this study were as follows: 1. We identified six health behavior typologies : 67.8% of the sample had a good diet quality but showed sedentary activity level(good diet lifestyle) and 10.9% had heavy smoking behavior(smoking lifestyle). Individuals included in fitness lifestyle cluster(6.2%) had high physical activity level and those in drinking life style(2.6%) had had mainly large amount of alcohol. Zero point six percent of sample were included in hedonic lifestyle cluster, who showed poor health behaviors in all. Those included in passive lifestyle(11.9%) had no active health promoting activities but tended to avoid risk taking health behavior such as cigarette smoking and alcohol drinking. 2. As a result of logistic regression analysis, to compare with the individuals in good diet lifestyle, the prevalence of chronic diseases of those in fitness lifestyle showed higher and that of those in smoking lifestyle, drinking lifestyle, hedonic lifestyle, passive lifestyle showed lower than them, retrospectively. 3. Adjusting with general characteristics and health status, to compare with the individuals in good diet lifestyle, the proportion of those who had good health management practices in fitness lifestyle was higher, and the proportion of those who had health check in past 2 years was lower than them, retrospectively. Conclusions: There were some differences in health behavior patterns between rural population and national population, which influenced significantly on health status and health management practice of them. We suggested that the health promotion program for them be developed with considering these points.

• Journal of The Korean Association of Information Education
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• v.17 no.2
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• pp.191-198
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• 2013

There are many studies about cognitive and non-cognitive characteristics of gifted children in the areas of math and science until now. Also, there is a lot of research for about cognitive and non-cognitive characteristics of gifted children. But, it lacks a lot of research on the characteristics of gifted children for information science area. So, characteristics of gifted children in the areas of information science are defined as structured information recall ability, regularization ability, reasoning ability, efficiency ability, structured ability, generalization ability, and abstract ability. And real problems for each ability are proposed. To make the evaluation questions proposed in this study on the cognitive gifted characteristics when compared with student achievement and prove that there is a correlation. The results of this study can be utilized in the evaluation of information giftedness children and can be utilized in the development of gifted education programs.

• Korean Journal of Labor Studies
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• v.17 no.1
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• pp.177-208
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• 2011

This article examines that how in-house subcontract has been introduced and developed in metal industry in 1970s, focusing typical workplaces in steel industry. That was essential for the capital to insure control mechanism for large number of laborer because of mobilizing a large scale of capital in industrialization of heavy metal industry. In case of Pohang steel industry, this necessity was fulfilled by introduction and imitation of Japanese personnel management by being included of Japanese economic hinterland. This was embodied in both constructing internal labor market for regular workers and introducing in-house subcontracting system for contingent workers at workplaces. This was exceptional comparing in-house subcontracting system in Korean steel industry with in-house subcontracting system in advanced economies, because of disappearing in-house subcontracting system by making internal labor market. And this was closely linked by late development of Korea. Implications of Pohang steel company's case are as follows : first, late development effect in formation of employment system, second, in linking informality of Korean employment system. This implications mean that in-house subcontracting in steel industry is structured as mechanism for personnel management in large factory being influenced by industrialization of heavy industry. In this point, improvements which include wide economic solution beyond labor solution for present problem of in-house subcontracting system is desirable.

• Korean Journal of Psychosomatic Medicine
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• v.22 no.1
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• pp.3-12
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• 2014

Objectives : We aimed to explore the relationship among fatigue and perceived stress, depressive mood in the working population. We also examined associations with demographic and life style factors and investigated the effect of individual coping skills on these associations. Methods : Fatigue Severity Scale(FSS), Perceived Stress Scale(PSS), Brief Encounter Psychosocial Instrument - Korean version(BEPSI-K), Beck Depression Inventory(BDI), Stress Coping Skill Questionnaire were administered to 621 civil servants. All of above and other demographic factors are self-administered questionnaire survey and this study is cross sectional. Results : Mean FSS score was 3.04 which was lower than 3.22, the severity cut off score. FSS, PSS, BEPSI-K, BDI were all higher in female. Subjects with active coping skills showed relatively low fatigue, perceived stress, depressive mood than those with passive coping skills. Logistic regression analyses indicated that the PSS, BDI, BEPSI-K in working population increase the risk of fatigue and regular exercise lowers the risk. Conclusions : Adults who were afflicted by stress, experienced depressive mood or were physically inactive were at much higher risk of feeling fatigue. Since no other large data sets are available for fatigue, the results from this study could serve a very useful purpose, to furnish a basis for comparison with future research results based on more complete data.