• Journal of the Korean Mathematical Society
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• v.39 no.5
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• pp.745-764
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• 2002

In this paper we Study a time-optimal model of pursuit in which the players move on a plane with bounded velocities. This game is supposed to be a nonzero-sum group pursuit game. The main point of the work is to construct and compare cooperative and non-cooperative solutions in the game and make a conclusion about cooperation possibility in differential pursuit games. We consider all possible cooperations of the players in the game. For that purpose for every game $\Gamma(x_0,y_0,z_0)$ we construct the corresponding game in characteristic function form $\Gamma_v(x_0,y_0,z_0)$. We show that in this game there exists the nonempty core for any initial positions of the players. The core can take four various forms depending on initial positions of the players. We study how the core changes when the game is proceeding. For the original agreement (an imputation from the original core) to remain in force at each current instant t it is necessary for the core to be time-consistent. Nonemptiness of the core in any current subgame constructing along a cooperative trajectory and its time-consistency are shown. Finally, we discuss advantages and disadvantages of choosing this or that imputation from the core.

• Journal of The Korean Association of Information Education
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• v.14 no.2
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• pp.139-148
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• 2010

This study aimed to develop the teacher training programs to prevent and treat of game addiction. First, we analyzed the existing training programs concerning game addiction and searched for various strategies applicable to game addiction prevention and treatment education programs. On this ground, training programs were divided into three courses that were the prevention program for normal students, the treatment program I for students in the potential-risk group, and the treatment program II for those in the high-risk group. For the prevention program, commonalities were drawn and developed from the existing studies and training programs; and for treatment programs, game addiction clinic centers were analyzed to draw various useful strategies and contents. We also developed the details of those programs in consultation with experts. As a result of content validity about the developed teacher training program to prevent and treat of game addiction, this program was generally appropriate and acceptable. We expect that the developed programs help to treat a student who has game addiction effectively.

• Journal of Korea Game Society
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• v.6 no.3
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• pp.67-76
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• 2006

This study is to examine relationship between immersiveness aspect and the recognition of garners who are exposed to PPL (Product Placement Advertisement) in online game. The frequency of exposure, the placement type of PPL, the perception under the threshold of consciousness and the interest at the product and knowledge about PPL have been widely known as the factors of effectiveness in PPL advertising. In this study, 'immersiveness' is newly introduced to investigate the effectiveness of PPL advertising due to the unique characteristics of game which easily leads to immersion. Control group is exposed to movie clip and experimental group to lacing online game. In conclusion, the deep immersion has reduced the perception level of user on PPL except the variable of PPL placement. This study suggests that how to design the PPL placement in game for enhancing marketing effect is all the more vital, in spite of the result that the player in high immersion cannot distinguish different images.

• Child Health Nursing Research
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• v.13 no.3
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• pp.282-290
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• 2007

Purpose: The purpose of this study was to examine the effects of EP-IGAP(Internet Game Addiction Prevention Educational Program) on increasing the self-control and decreasing the time spent on internet games. Method: The research design was a quasi-experiment, repeated measures design with non-equivalent control group. Participants in this study were 269 elementary school students of elementary school(134 for the experimental group, 135 for the control group). The instruments used in this study were the Self-control of Internet Game Scale and Time spent on internet games per week. The experimental group participated in the EP-IGAP for 6 weeks. Results: After the intervention, the experimental group showed a significant increase in self-control related to internet games. But, there was no statistical difference in the time spent on internet games between the two groups. Conclusion: These results suggest that EP-IGAP is effective in increasing the self-control related to internet games in elementary school students. Further research is needed to modify the EP-IGAP.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.1
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• pp.368-374
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• 2010

The purpose of this study was investigate the effect of rehabilitation exercise using a home video game(PS2, Sony) on gait ability in the chronic stroke patients. The subjects of this study were 32 patients who underwent stroke for more than 6 months and were assigned to a game-based exercise group (n=16) or a control group (n=16). The Game-based exercise group executed a rehabilitation exercise three times a week during 6 weeks, at the rehabilitation unit. The exercise was performed by PS2 for one hour. Control group maintained their usual life without application of exercise. Outcome measures included gait ability. After the completion of the game-based exercise, 10m walking velocity was improved significantly (p<0.05). Six minute walking distance was increased significantly (p<0.05). These results showed that the rehabilitation exercise using a home video game is effective in the improvement of gait ability in chronic stroke patients. This study suggest that interesting, motivating game-based rehabilitation exercise and effective in recovery of function exercise for chronic stroke patients should be necessary to develop and apply.

• The Journal of the Korea Contents Association
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• v.13 no.6
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• pp.67-76
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• 2013

By integrating of intrinsic motivation theory and flow theory, this study sought to investigate the causal linkage among optimal balance of video game player's perceived skill and challenge, flow experience, intrinsic motivation and video game genre usage. A path analysis showed that the different types of video game usage were directly influenced by players' intrinsic motivations, which were also reinforced by players' flow experiences of enjoyment. However, the path model with a multiple group approach provided no strong evidence for gender differences in the relationships between the variables of interest.

• Journal of Korea Game Society
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• v.10 no.6
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• pp.67-78
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• 2010

Game is the cultural product, which gives users high authority in usage process with its high interactivity. This study is about the user innovation based on customer empowerment, and the possibilities to change the game itself applying high activity of the game. Especially, game modification, which users transform the original game, is an example that the interactivity and changeability of game are maximized. However, these elements were not considered when constructing frameworks to investigate the competition and strategy in game industry. Therefore, this study is based on the customer empowerments of the game modification. Moreover, this study proposes the newly reorganized strategic group map in game industry, which is based on game user innovation and user evaluation.

• Journal of Korean Medicine Rehabilitation
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• v.21 no.2
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• pp.227-238
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• 2011

Objectives : This study was to investigate the effects on using Virtual reality exercise program($Wii-Fit^{TM}$) for dynamic balance and walking ability in patients with stroke. Methods : The 22 subjects were randomly selected from the patients of the S hospital who met the study conditions. They were divided into a $Wii-Fit^{TM}$ balance game group of 12 patients and a conventional physical therapy group of 10 patients. The $Wii-Fit^{TM}$ balance game group received $Wii-Fit^{TM}$ balance game group general physiotherapy for 5 days a weeks, 30 minutes a day, for a 4 weeks and the conventional physical therapy group received general physiotherapy for the same period. The subjects were measured and compared for Brunel balance assessment, functional gait assessment, 6 minute walk test, GAITRite system before and after the program. Results : The experimental group tend to improve more than control group in shifting the weight to the affected side(p=0.040) and tap test(p<0.001). The experimental group tend to improve more than control group in FGA(p=0.016). The experimental group improved significantly more than control group in 6MWT(p=0.008). The experimental group improved significantly more than control group in gait speed, cadence, stride length. Conclusions : Virtual Reality program($Wii-Fit^{TM}$) with conventional physical therapy shows the benefits on dynamic balance and gait parameters in patients with stroke.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.15 no.4
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• pp.277-301
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• 2020

This study surveyed 503 adults to examine the effect of gaming disorder classification, recently announced by World Health Organization(WHO), when it is applied to Korean game market. Considering the difference in respondents' background knowledge on gaming disorder, half of the respondents were randomly assigned to read an informative news article describing WHO's decision and its expected effect on domestic game industry. Based on previous literature of gaming disorder, we categorized respondents into a normal-use group and a potentially problematic-use group. As a result of analyses, it was found that the gaming disorder classification would yield overall reduction of game-related consumption in terms of gaming time(24%), game cost(28%), the number of games(22%), etc. The potentially problematic group showed higher willingness to pay for gaming than the normal group did, even if the game cost presumably increases due to the gaming disorder classification. A similar outcome was observed in those with high stress levels. This implies that the policy to solve game addiction problems may ironically lead to unexpected cost increases to the target group of the policy. Hence, problematic groups, especially, highly stressful people and the people with the lack of self-control, need to be considered when the gaming disorder classification policy is established. Furthermore, the informative news article had the preventive effect on the attitude and the intention of the people with moderate or high self-control capacity, but not to the people with gaming-additive tendencies, Again, this finding confirms the necessity of the tweezers policy to refine target groups by their characteristics and prepare for differentiated policies. When the gaming disorder classification is simply adopted with no consideration of domestic circumstances, irreversible loss could affect Korean game users, game industries, and related companies. This calls for urgent cooperation between academia, government, and industry to set up appropriate measures to deal with the gaming disorder classification.

• Proceedings of the Korean Society of Computer Information Conference
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• 2014.07a
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• pp.485-487
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• 2014

여러 종류의 공포를 통해 플레이어들이 가장 공포를 느끼는 효과적인 연출 방법을 사용하여 개발한 게임인 '사이코메트리 psychometry'를 연구 재료로 20대 여성 FGT(Focus Group Test)를 통해 나타난 설문을 바탕으로 어떤 요소들이 플레이어들에게 두렵게 다가왔는지를 파악하고 그 이유에 대해 작성, 또 문제의 더 나은 해결 방법을 제시하였다.