• Journal of Information Processing Systems
• /
• v.15 no.3
• /
• pp.616-631
• /
• 2019

With the rapid increase of information on the World Wide Web, finding useful information on the internet has become a major problem. The recommendation system helps users make decisions in complex data areas where the amount of data available is large. There are many methods that have been proposed in the recommender system. Collaborative filtering is a popular method widely used in the recommendation system. However, collaborative filtering methods still have some problems, namely cold-start problem. In this paper, we propose a movie recommendation system by using social network analysis and collaborative filtering to solve this problem associated with collaborative filtering methods. We applied personal propensity of users such as age, gender, and occupation to make relationship matrix between users, and the relationship matrix is applied to cluster user by using community detection based on edge betweenness centrality. Then the recommended system will suggest movies which were previously interested by users in the group to new users. We show shown that the proposed method is a very efficient method using mean absolute error.

• Journal of Korean society of Dental Hygiene
• /
• v.14 no.4
• /
• pp.563-570
• /
• 2014

Objectives : The purpose of this study was to investigate the relationship of subjective recognition for oral health in HBsAg positive carriers based on the data of the $5^{th}$ National Health and Nutrition Examination Survey. Methods : A statistical package SPSS 21.0 was used to analyze the relationship between oral health status and subjective oral health awareness based on data of the $5^{th}$ National Health and Nutrition Examination Survey. Results : The subjective poor oral health was found in those who had mastication and speaking discomfort and those having dental prosthesis. Conclusions : The respondents considered themselves to be in poor oral health when the subjective systemic health status and objective oral health status were worse.

• Korean Journal of Mathematics
• /
• v.29 no.4
• /
• pp.649-664
• /
• 2021

There have been numerous efforts to provide legal information to the general public easily. Most of the existing legal information services are based on keyword-oriented legal ontology. However, this keyword-oriented ontology construction has a sense of disparity from the relationship between the laws used together in actual cases. To solve this problem, it is necessary to study which laws are actually used together in various judicial precedents. However, this is difficult to implement with the existing methods used in computer science or law. In our study, we analyzed this by using topological data analysis, which has recently attracted attention very promisingly in the field of data analysis. In this paper, we applied the the Mapper algorithm, which is one of the topological data analysis techniques, to visualize the relationships that laws form organically in actual precedents.

• Computers and Concrete
• /
• v.15 no.3
• /
• pp.321-335
• /
• 2015

To be able to understand the behavior of reinforced concrete (RC) members, cross sectional behavior should be known well. Cross sectional behavior can be best evaluated by moment-curvature relationship. On a reinforced concrete cross section moment-curvature relationship can be best determined by both experimentally or numerically with some complicated iteration methods. Making these experiments or iterations manually is very difficult and not practical. The aim of this study is to research the efficiency of Neural Networks (NN) as a more secure and robust method to obtain the moment-curvature relationship of circular RC columns. It is demonstrated that the NN based model is highly successful to determine the moment-curvature relationship of circular reinforced concrete columns.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.17 no.8
• /
• pp.2053-2067
• /
• 2023

This paper proposes two video quality assessment methods based on deep neural network. (i)The first method uses the IQF-CNN (convolution neural network based on image quality features) to build image quality assessment method. The LIVE image database is used to test this method, the experiment show that it is effective. Therefore, this method is extended to the video quality assessment. At first every image frame of video is predicted, next the relationship between different image frames are analyzed by the hysteresis function and different window function to improve the accuracy of video quality assessment. (ii)The second method proposes a video quality assessment method based on convolution neural network (CNN) and gated circular unit network (GRU). First, the spatial features of video frames are extracted using CNN network, next the temporal features of the video frame using GRU network. Finally the extracted temporal and spatial features are analyzed by full connection layer of CNN network to obtain the video quality assessment score. All the above proposed methods are verified on the video databases, and compared with other methods.

• Nuclear Engineering and Technology
• /
• v.50 no.5
• /
• pp.673-682
• /
• 2018

One of the most widely used methods to estimate core damage during a nuclear power plant accident is containment radiation measurement. The evolution of severe accidents is extremely complex, leading to uncertainty in the containment dose rate (CDR). Therefore, it is difficult to accurately determine core damage. This study proposes to conduct uncertainty analysis of CDR for core damage assessment. First, based on source term estimation, the Monte Carlo (MC) and point-kernel integration methods were used to estimate the probability density function of the CDR under different extents of core damage in accident scenarios with late containment failure. Second, the results were verified by comparing the results of both methods. The point-kernel integration method results were more dispersed than the MC results, and the MC method was used for both quantitative and qualitative analyses. Quantitative analysis indicated a linear relationship, rather than the expected proportional relationship, between the CDR and core damage fraction. The CDR distribution obeyed a logarithmic normal distribution in accidents with a small break in containment, but not in accidents with a large break in containment. A possible application of our analysis is a real-time core damage estimation program based on the CDR.

• Korean Security Journal
• /
• no.42
• /
• pp.335-360
• /
• 2015

Police is an organization that provides service to the public. Police service is focusing on enforcing the law and solving the problem to improve the relationship between police and the public within the society. To accomplish their goal, police should build a better relationship with the public. In the current study, the researcher focused on factors of police service quality, community policing, fear of crime, police-citizen relationship, and the relationship among citizens. The current study used the interview methods for collecting data of 371 individuals from Seoul metro area and resulted that each factors had a causal relationship but police-citizen relationship and citizen-citizen relationship did not show the statistically significant results. Based on this study, the research provided critics and implications.

• Journal of Technologic Dentistry
• /
• v.40 no.4
• /
• pp.239-247
• /
• 2018

Purpose: The purpose of this study was to investigate the denture attachment status and the denture need of elderly Koreans and to provide basic data for improving the quality of life by developing methods and education programs for the oral health of the elderly. Methods: This study selected 4,340 persons who completed questionnaires and oral examinations among elderly people aged 65 or older only from the National Health and Nutrition Examination Survey data of the 6th period (2013-2015). Results: There was a significant relationship between age, residence, and education level in complete dentures. There was a significant relationship between gender, age, residence, and education level in the partial denture wearing state. In the complete denture need, there was a significant relationship with age. The need for partial denture was found to be significant in gender, age, and residence. Conclusion : Based on the results of this study, it can be used as basic data for oral health education and dental prosthesis related to denture which can improve oral health of the elderly in the future.

• Journal of Korean Academy of Nursing
• /
• v.47 no.2
• /
• pp.199-210
• /
• 2017

Purpose: The purpose of this study was to examine the effects of a group counseling program based on goal attainment theory on self-esteem, interpersonal relationships, and school adjustment of middle school students with emotional and behavioral problems. Methods: Forty-four middle school students with emotional and behavioral problems (22 in the experimental group and 22 in the control group) from G city participated in this study. Data were collected from July 30 to September 24, 2015. The experimental group received the 8-session program, scheduled once a week, with each session lasting 45 minutes. Outcome variables included self-esteem, interpersonal relationship, and school adjustment. Results: There were significant increases for self-esteem (t=3.69, p=.001), interpersonal relationship (t=8.88, p<.001), and school adjustment (t=4.92, p<.001) in the experimental group compared to the control group. Conclusion: These results indicate that the group counseling program based on goal attainment theory is very effective in increasing self-esteem, interpersonal relationship, and school adjustment for middle school students with emotional and behavioral problems. Therefore, it is recommended that the group counseling program based on goal attainment theory be used as an effective psychiatric nursing intervention for mental health promotion and the prevention of mental illness in adolescents.

• Journal of Korean society of Dental Hygiene
• /
• v.9 no.3
• /
• pp.536-544
• /
• 2009

Purpose : This study aimed to examine the relationship between intragroup peer evaluation and self-directed learning readiness(SDLR) in an Introduction to Education class that used a team based learning(TBL). Moreover, it identified the specific components of the SDLR that predicted the peer evaluation results. Method : The research subject pool comprised of 87 $1^{st}$ students in D Health College. Each team was composed of 6~8 members, each of whom evaluated all other members on his or her team SDLR was measured by using SDLR-K-96. Results : SDLR and peer assessment scores had a positive relationship, confirming that SDLR was an important variable that could predict the peer evaluation scores. Among the SDLR factors, 'openness to challenge' and 'self-confidence as a learner' was shown to have the predictive power for the peer assessment. Conclusion : The colleges should provide dental hygiene students with learning opportunities on ability to do self-directed learning through diverse learning methods such as team based learning.