• Health Policy and Management
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• v.34 no.2
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• pp.163-177
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• 2024

Background: This study aims to examine changes in fraudulent claim counts and total reimbursements before and after enhancements in counterfeit claim controls and monitoring of provider claim patterns under the "Proactive self-audit pilot program of fraudulent claims." Methods: This study used the claims data and hospital information (July 2021-February 2022) of the Health Insurance Review and Assessment Service. The data was collected from 1,129 hospitals assigned to the pilot program, selected from the providers who filed a claim for reimbursement for intravenous injections. Paired and independent t-tests, along with regression analysis, were utilized to analyze changing patterns and factors influencing claim behaviors. Results: This program led to a reduction in the number of fraudulent claims and the total amount of reimbursements across all levels of hospitals in the experimental groups (except for physicians below 40 years old). In the control group, general hospitals and hospitals demonstrated some significant decreases based on the duration since opening, while clinics showed significant reductions in specified subjects. Additionally, a notable increase was observed among male physicians over the age of 50 years. Overall, claims and reimbursements significantly declined after the intervention. Furthermore, a positive correlation was found between hospital opening duration and claim numbers, suggesting longer-established hospitals were more likely to file claims. Conclusion: The results indicate that the pilot program successfully encouraged providers to autonomously minimize fraudulent claims. Therefore, it is advised to extend further support, including promotional activities, training, seminars, and continuous monitoring, to nonparticipating hospitals to facilitate independent improvements in their claim practices.

• Journal of Korean Library and Information Science Society
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• v.39 no.2
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• pp.375-405
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• 2008

Recently, children's internet search engines are becoming the main method to access information. For those engines to function properly, search behavior of children as their searchers should be studied and the findings be applied to design and improve the systems. So an experiment was conducted and 22 3rd-grade elementary school students performed 3 searching tasks through 'Junior Naver' and 'Yahoo!꾸러기' which are representative children's search engines in Korea. Children's searching behavior was analyzed thoroughly through which the problems of children's search engines were diagnosed and recommendations were suggested to improve them.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.13 no.6
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• pp.77-87
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• 2014

It has reported that a median bus-stop island on an exclusive median bus lane (EMBL) has shortened a crossing distance unit, encouraged a pedestrian's illegal crossing, and increased the number of accidents in the area. This study presents (1) the analysis of inappropriate pedestrian crossing patterns collected on exclusive median bus corridors and (2) the estimated performance of safety barriers restraining the occurrence of those. Total 19,649 pedestrian crossing data collected at the 'Sookmyung-university' median bus-stop, and the inappropriate pedestrian crossing patterns among those were grouped in terms of time and space violations. Physical safety barriers restraining illegal pedestrian crossings were considered as an alternative, and its performance in safety was quantified through microscopic simulation with conflict analyses by using surrogate safety assessment model. The findings suggest the number of conflicts reduced be 24.9 percentages compared to the one of the present condition when the physical safety barriers are placed at each of the eight ends of the EMBL pedestrian crossing.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.13 no.2
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• pp.57-67
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• 2014

In the last decade, various situations were simulated through virtual environment due to rapid improvement of computer capability and technology. Transportation engineering also has adopted the virtual environment facility in order to identify drivers behaviour under various circumstances. This study aims to evaluate driver reactions to the introduction of new ITS interventions at railway crossings (RLX) in driving simulator. Three ITS safety devices were used to figure out how drivers reacted to them. In addition, a survey was conducted to find participants' work load and acceptance of the technology. The ultimate purpose of this paper is to evaluate ITS safety devices in various aspects. Each participant made 3 runs (2 baselines, 1 ITS randomly) for approximately 20 minutes each. The participants answered that current railway crossings did not look safe prior to experiment. They responded that the use of ITS technologies were easy and the technologies were more effective on passive railway crossings.

• Journal of Korean Library and Information Science Society
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• v.43 no.1
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• pp.143-171
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• 2012

The primary questions addressed by this research are the followings: Have the OPAC interfaces of children's libraries been designed user-friendly; What difficulties have OPAC searchers experienced in using OPACs; How do they perceive the system after searching it; Through the answers of those questions the problems of OPACs for children as searching tools have been grasped and recommendations have been suggested in order to improve the OPAC interfaces. An experiment was conducted and 28 children of grades 4 to 6 performed 5 searching tasks. The searching behavior of OPAC searchers has been analyzed thoroughly. The data of their perceptions about the system was collected through a questionnaire after completing the tasks.

• Journal of Korean Library and Information Science Society
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• v.38 no.3
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• pp.353-381
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• 2007

The primary questions addressed by this research are the followings: Have the OPAC interfaces of elementary school libraries been designed user-friendly; What difficulties do OPAC searchers experience in using OPACs; How do they perceive the system after searching it; Finding the answers of those questions the problems of OPAC as a searching tool were grasped and recommendations were suggested in order to improve the system. An experiment was conducted and 35 elementary school students performed 5 searching tasks. The searching behavior of OPAC searchers was analyzed thoroughly. The data of their perceptions about the system was collected through a questionnaire after completing the tasks.

• Journal of the Korean Society for Library and Information Science
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• v.31 no.3
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• pp.165-208
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• 1997

The purpose of this study is to evaluate the characteristics of user interface that affect the searching behavior of OPAC users. and then to propose how to design user-friendly interfaces of OPACS. An experiment was conducted on two systems with different interfaces to grasp the effect of user interface to search process and search outcome. A $2\times2$ cross-over design was used for the experiment. Sixty five searchers participated in the experiment. Several statistical techniques such as carry-over effect and system effect of a $2\times2$ cross-over design, $\chi^2$ test, t- test, McNemar test, test of marginal homogeneity through maximum likelihood method, factor analysis, regression analysis, and analysis of variance were applied according to the hypotheses tested and the data analyzed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.12
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• pp.3895-3901
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• 2009

The purpose of this study was to evaluate the effect of professional tooth cleaning and dental health education on dental clearances and dental health behaviors. This study was designed into two groups, 80 persons of control group for dental health education and 80 persons of experimental group for dental health education and professional tooth cleaning. In order to compare education effects, the researcher applied different educational methods. The parameters were the toothbrushing frequency, the average tooth brushing time, the action rate of toothbrushing after lunch, and the rate of using oral hygiene product. The data were analyzed and the following was the conclusion. The frequency of toothbrushing in two groups increased. Toothbrushing frequency of the experimental group was significantly higher than that of preliminary group and control group. The action rate of toothbrushing after lunch in two groups increased. But the experimental group was significantly higher. The score for dental clearances of the experimental group were higher than those of the control group. The data showed statistically significant difference.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.21 no.1
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• pp.123-140
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• 2022

Even though driving behaviors in underground roads can be significantly different from ground roads, existing underground roads follow the design guidelines of ground roads. In this context, this study investigates the driving behaviors of the exit-ramp terminal of urban underground roads using a driving simulator. Virtual driving experiments were performed by analyzing scenarios between the underground and ground road environments. The experiments' driving behavior data for each geometry section are compared and validated through a statistical significance test. This test showed that the speed in the underground road environment is relatively low, and the LPM tends to move away from the adjacent tunnel wall. Based on these findings, this study suggests implications and feasible solutions for improving driver's safety in the exit-ramp terminal of the underground roads.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.604-607
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• 2012

소셜 네트워크 서비스의 하나인 트위터는 팔로우를 통하여 사용자 간의 관계를 맺을 수 있다. 트위터 사용자들은 다양한 팔로워들이 존재한다. 이 팔로워들은 사용자에 대한 호감을 가지고 팔로우 하거나, 맹목적으로 추종하거나, 부정적인 의견을 지니고 사용자의 행동과 글을 관찰하기 위해 팔로우할 수도 있다. 본 논문에서 사용자에게 팔로워들이 어떠한 목적으로 그 사용자를 팔로워의 행태를 분석하는 모델을 제안한다. 대상사용자의 영향력 있는 팔로워를 추출하고, 팔로워의 리트윗 정보, 프로파일, 최신 트윗의 감정분석을 통해 지지자, 중립, 비지지자로 분류한다. 제안 방법의 유효성을 검증하기 위해 트윗 데이터에서 정치인과 언론인 5 명의 팔로워들 중 무작위로 3 만명을 추출하여 실험하였다. 실험 결과 영향력 있는 사용자 추출을 통한 지지 팔로워 추출이 효과적임을 알 수 있다.