• Proceedings of the Korean Information Science Society Conference
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• 2012.06b
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• pp.333-335
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• 2012

가상군의 자율행위 모델링은 전장모의모델링 시스템의 성능을 결정하는 주요한 요소이다. 불확실한 상황을 확률적으로 고려하여 최적의 의사결정을 가능하게 하는 POMDP (partially observable Markov decision process) 모델은 가상군의 자율행위 모델링에 있어서 매우 자연스러운 프레임워크이다. 그러나 POMDP 모델의 높은 계산복잡도로 인한 최적 행동정책 계산의 어려움은 POMDP 모델을 이용한 가상 군의 자율행위 모델링을 저해하는 요소이다. 본 논문에서는 대규모 가상군의 자율행위 모델링을 위해 factored POMDP 모델을 이용한다. 그리고 "Hasty Defense" 사례연구를 통해 그 효과를 확인한다.

• Journal of the Korean Society of Physical Medicine
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• v.7 no.3
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• pp.387-393
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• 2012

연구목적 : 본 연구는 Xbox 360 Kinetic Sensor를 사용한 가상현실 상호작용 게임이 무릎 골관절염을 앓는 여성 노인의 균형능력에 미치는 영향을 알아보는 것이다. 연구방법 : 65세 이상의 지역사회에 거주하는 여성 노인으로 무릎 골관절염으로 진단받은 40명을 대상자로 선정하였다. 대상자는 20명씩 무작위로 실험군과 대조군에 배치되었다. 실험군은 Xbox 360 Kinetic Sensor를 사용한 가상현실 상호작용 게임을 매 30분, 주 3회, 4주간 처치하였다. 대조군은 가상현실 상호작용 게임을 적용하지 않았다. 결과 측정은 눈을 뜬 상태와 눈을 감은 상태에서 신체 중심의 이동거리로 측정하였다. 연구결과 : 실험군의 신체중심 이동거리는 눈을 뜬 상태와 눈을 감은 상태 모두 중재 전보다 유의하게 증가하였다. 또한 중재후 실험군의 신체중심 이동거리는 눈을 뜬 상태와 눈을 감은 상태 모두 대조군보다 유의하게 높게 증가하였다. 결론 : Xbox 360 Kinetic Sensor를 이용한 가상현실 상호작용 게임은 무릎 골관절염을 앓는 여성 노인의 균형 능력을 증진시키는데 효과적이었다.

• Proceedings of the Korea Contents Association Conference
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• 2016.05a
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• pp.285-286
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• 2016

본 연구는 가상현실시스템을 이용한 훈련이 뇌졸중 환자의 균형과 낙상효능감에 미치는 영향을 알아보기 위해 실시하였다. 연구 대상자는 뇌졸중 환자 20명으로 실험군 10명 대조군 10명씩 각각 배정하였다. 실험군과 대조군 모두 일반적인 주 5회의 물리치료와 작업치료를 받았다. 실험군은 추가적으로 가상현실 프로그램을 이용하여 8주간 1일 20분 주 3회 시행하였다. 본 연구의 측정은 균형수행 능력검사, 낙상효능감 척도검사를 사용하였다. 두 군 간 훈련 후 측정 사이에 균형수행 능력검사와, 낙상효능감 검사에서 통계적으로 유의한 차이를 보였다(p<0.05). 또한 각 군 간 훈련 후 측정 사이에 균형수행 능력검사와, 낙상효능감 검사에서 통계적으로 유의한 차이를 보였다(p<0.05). 따라서 가상현실 프로그램 병행한 훈련이 뇌졸중 환자의 균형과 낙상효능감을 향상시키는데 긍적적인 도움을 주어 유용한 뇌졸중 환자의 치료 프로그램으로 사용될 수 있을 것으로 보여 진다.

• Journal of the Korean Institute of Intelligent Systems
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• v.23 no.2
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• pp.120-125
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• 2013

This paper proposes a goal oriented action planning method that plans the behaviors of computer generated forces and a replanning method that replans new actions when the situations are changed in war game. This new method provides good expression because it is flexible and can do more realized description unlike the conventional finite state machines. As a result, proposed method has an advantage that it can describe the behaviors of computer generated forces as those of real soldier. However, since it is not deterministic it has some difficulties in analysing the decision processing of behaviors and making the computer generated forces do some specific actions. We employed combat plane models of air forces in order to verify the feasibility of our method. Finally, we could find that our method produced very similar behaviors to those of a real soldier. This paper describes our planning method, experimental results, and future works.

• Journal of the Korean Society of Physical Medicine
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• v.8 no.2
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• pp.201-207
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• 2013

연구목적: 닌텐도 위를 이용한 가상현실기반 비디오게임 프로그램을 만성기 뇌졸중 환자에게 적용하여 균형능력 및 일상생활동작에 어떠한 영향을 미치는지 알아보고, 뇌졸중 환자의 재활프로그램으로서 적용 가능성이 있는지 알아보고자 한다. 연구방법: 만성기 뇌졸중 환자를 무작위로 가상현실기반 비디오게임 프로그램을 적용한 실험군(n=7)과 적용하지 않은 대조군(n=10)으로 구분하여 연구를 진행하였다. 연구에 참여한 모든 대상자에게 30분의 Bobath therapy와 15분간의 FES 치료를 기본적으로 실시하였다. 이에 더하여 실험군은 가상현실기반 비디오게임 프로그램을 1일 30분이내, 주 5회, 3주간 실시하였다. 대조군은 자전거 운동과 보행훈련으로 30분간 시행하였다. 실험 전 후 눈뜨고 외발서기(OLST; open leg standing test), Timed Up and Go(TUG) 검사, 10m 걷기 검사, Functional Independence Measure(FIM)를 측정하였다. 실험 전과 실험 후 측정값의 차이를 비교하기 위해 Wilcoxon Signed Ranks Test를 실시하였다. 그리고 각 측정값의 변화량에 대한 실험군과 대조군 사이의 차이를 알아보기 위해 Mann-Whitney U Test를 실시하였다. 연구결과: 실험결과는 다음과 같다. 1) 실험군에서는 FIM의 유의한 증가와 TUG, 10m 걷기 검사의 유의한 감소를(p<.05) 보였다. 대조군에서는 OLST의 증가와 TUG, 10m walking test의 감소가 나타났지만 통계적으로 유의하지 않았다. 오직 FIM에서만 유의한 증가가 나타났다(p<.05). 2) 실험 전 후의 실험군과 대조군의 각 측정값들의 평균차를 비교한 결과 실험군은 대조군보다 실험 전 후 OLST, TUG, 10m walking test 차이의 평균은 컸지만 통계적으로 유의하지 않았다. 결론: 이상의 결과로부터 가상현실기반 비디오게임이 만성기 뇌졸중 환자의 동적균형능력 및 일상생활동작 향상에 효과가 있음을 알 수 있었다.

• The Journal of the Convergence on Culture Technology
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• v.9 no.4
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• pp.195-200
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• 2023

The purpose of this study was to investigate the effects of a virtual reality rehabilitation program on upper limb function, cognition, and activities of daily living in stroke patients. Among the 25 participants in the program, it was randomly classified 13 experimental group and 12 control group. Rehabilitation training was applied 3 times a week and general occupational therapy 2 times a week using virtual reality rehabilitation training equipment in the experimental group, and general occupational therapy was performed 5 times a week, 30 minutes per session in the control group. As a result of the virtual reality rehabilitation program, cognitive function increased by 3.39 points in the experiment group, The control group who received only general occupational therapy increased by 1.5 points. As for the upper limb function, the average of the experimental group subjected to the virtual reality rehabilitation program increased by 4.84 points The control group who received only general occupational therapy increased by 1.34 points. As for activities of daily living, the average of the experimental group that conducted the virtual reality rehabilitation program increased by 20.38 points, The control group who received only general occupational therapy increased by 7.61 points. This result show that the virtual reality program has an effect on upper limb function, cognition, and activities of daily living of stroke patients.

• Journal of the Korea Society of Computer and Information
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• v.16 no.9
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• pp.11-18
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• 2011

This paper proposes a novel planning method for computer generated forces (CGFs) in war games that plans the behaviors of CGFs according to a given mission and situations. CGFs which are received their missions first plan their tasks for accomplishing the mission and then plan their behaviors for accomplishing each task. After that, they execute their planned behaviors considering the conditions of environments (in other words situations). The tasks and behaviors are hierarchically composed and include start conditions for beginning those and termination conditions for stopping those. CGFs first check whether the start condition of the planned behavior for accomplishing a task is satisfied or not in some degree and perform the behavior if satisfied continuously until the termination condition of the behavior will be met. If the termination condition is satisfied, then they check the start condition of the next planned behavior. This process will be repeated for accomplishing the mission. If the situations of CGFs are different by changing the environments from those of planning time, it may cause the start condition of the planned behavior to be dissatisfied. In this case, CGFs can decide a new behavior using fuzzy rule base. We realized our planning system and tested CGFs with a scenario. Experimental results showed that our system worked well and actively coped with situation changes. It will be possible to make CGFs that can do more autonomous behaviors if we continually develop our method.

• Korean Journal of Clinical Laboratory Science
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• v.50 no.4
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• pp.492-500
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• 2018

This study examined the effects of a dual-task virtual reality program on the cognitive function and EEG for patients with mild cognitive impairment. A dual-task virtual reality program was performed in the experimental groups while conventional occupational therapy was carried out in the control group for 30 minutes per session, which was done five days per week for 6 weeks. The results were as follows. First, the memory of the cognitive function and balance was improved significantly in the experimental group with the dual-task virtual reality program compared to the control group with the traditional occupational therapy. Second, EEG was also increased significantly in the experimental group compared to the control group. The results of this study suggest that the dual-task virtual reality program was an effective treatment method for the elderly with mild cognitive impairment and would be a cornerstone of basic data that will be helpful to those suffering from a range of diseases.

• Journal of Korea Entertainment Industry Association
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• v.13 no.4
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• pp.321-329
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• 2019

This study aimed to investigate the effect of virtual reality training focus on ADL on upper extremity function and activities of daily living in stroke patients. 20 patients with chronic stroke were included in this study. The participants were divided into the experimental (n=10) or control (n=10) groups. Both groups received conventional rehabilitation therapy for 30 min a day, 5 times per week for 4 weeks. The experimental group also performed virtual reality training focus on ADL for 30 min a day, and the control group performed general virtual reality training for 30 min a day. The Fugl-Meyer Assessment (FMA) and Functional Independence Measure (FIM) scores were evaluated before and after the intervention, and both groups showed significant improvement (p<.05). Compared to the control group, the experimental group showed significant improvement in the FMA wrist score and the FIM total, self-care, and sphincter control scores (p<.05). These findings suggest that virtual reality training focus on ADL may have a positive effect on wrist function and overall ADLs compared to that using general virtual reality training in stroke patients.

• KIISE Transactions on Computing Practices
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• v.23 no.6
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• pp.343-349
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• 2017

Combat modeling and simulation (M&S) of large-scale computer generated forces (CGFs) enables the development of even the most sophisticated strategy of combat warfare and the efficient facilitation of a comprehensive simulation of the upcoming battle. The DEVS-POMDP framework is proposed where the DEVS framework describing the explicit behavior rules in military doctrines, and POMDP model describing the autonomous behavior of the CGFs are hierarchically combined to capture the complexity of realistic world combat modeling and simulation. However, it has previously been well documented that computing the optimal policy of a POMDP model is computationally demanding. In this paper, we show that not only can the performance of CGFs be improved by an efficient POMDP tree search algorithm but CGFs are also able to conveniently learn the behavior model of the enemy through case studies in the scenario of counterfire warfare and the scenario of a mechanized infantry brigade's offensive operations.