• Proceedings of the Korean Society of Computer Information Conference
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• 2013.01a
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• pp.39-40
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• 2013

의료용 기능성게임의 효과가 입증되면서 다양한 분야의 투자와 주목을 받고 있다. 이에 따라 사용자를 위하여 의료용 기능성게임의 품질평가가 중요한 이슈가 되었다. 품질평가는 객관적인 기준과 평가요소 개발이 중요하다. 기능성게임의 특성 상 품질평가는 기술적인 영역과 비기술적인 영역으로 나누어 진행된다. 본 연구에서는 의료용 기능성게임의 비기술적인 영역의 품질평가 요소를 개발하기 위한 방법을 제안한다. 제안한 방법을 사용하여 심리 치료와 헬스케어 및 재활치료 2개 분야에 대해 각각 5개의 평가 요소를 추출하였다. 추출 결과는 전문가에 의해 내용 타당도 검사로 신뢰성을 확보했다. 본 연구는 다양한 분야의 기능성게임 품질평가 모델 개발의 가이드라인이 될 것이다.

• Proceedings of the KIEE Conference
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• 2005.07b
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• pp.1101-1103
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• 2005

초전도 전력기기에서는 선재를 이용하여 권선한 코일 형태로 적용되므로 코일을 구성하는 각각의 초전도 선재에서는 코일 여자시 임의 방향의 자장이 발생한다. 초전도 코일에서 발생하는 주 교류손실인 자화손실을 예측하기 위해서는 임의 방향 외부자장에 의한 초전도 선재의 자화손실을 알아야 한다. 본 논문에서는 BSCCO선재에서 측정된 임의방향 자장에 의한 자화손실과 수직방향 자장에 의한 자화손실값을 이용하여 초전도 선재에서 자화손실의 자장방향 의존성 및 임의 각도의 인가자장에 의한 자화손실 예측방법을 살펴보았다.

• Proceedings of the IEEK Conference
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• 2000.09a
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• pp.523-526
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• 2000

본 논문에서는 임의의 모양을 가지는 영상 객체(image object)에 적용 가능한 모양적응 이산변환(PSADT : Polar coordinates shape adaptive discrete transform)에 기반한 새로운 워터마킹 기법을 제안한다. 대수-극 좌표계(log-polar coordinates)와 모양적응 이산변환을 이용하여 제안된 기법은 MPEG-4의 VOP와 같은 임의의 모양을 가지는 영상 객체에 적용할 수 있을 뿐만 아니라 기존 기법에 비하여 회전과 크기 변화와 같은 기하학적인 공격에 대하여 우수한 강인성을 제공한다.

• Journal of the Korean Data and Information Science Society
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• v.10 no.1
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• pp.37-45
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• 1999

In this paper, we consider two components system having Marshall-Olkin's bivariate exponential model. For the bivariate random censorship, we obtain maximum likelihood estimators of parameters and system reliability. And we propose the methods of homogeniety and independence tests using asymptotic normality. Also we compute the estimators and p-values of the testings through Monte Carlo simulation.

• Convergence Security Journal
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• v.11 no.5
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• pp.13-19
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• 2011

Mobile nodes in MANETs have the nature of unrestricted mobility so that they will join and leave the network frequently. Therefore, it important consideration to determine the optimal distance progress between relaying nodes along the route in order to maintain the established route for an arbitrary length of time (i.e., route duration). In this paper, we derived the link maintenance probability by considering the initial distance between two relaying nodes and node mobility. Based on the link maintenance probability, we further analyzed the route stability by considering the impact of distance progress between relaying nodes along the route.

• The Journal of the Korea Contents Association
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• v.16 no.3
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• pp.546-552
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• 2016

With the increasing popularity of computer games as a leisure activity, there has been a rise in the interest in the effectiveness of serious games. Many of the earlier researches are focused on evaluation of effects, types, developments of serious games, whereas little is known about the after effects of serious games. The aim of this paper is to examine the previous literatures on serious games in regard to their impacts and outcomes of gaming for the purpose of empirical evidence as impacts and outcomes are needed for exploratory study of variable outcomes of educational serious games. It is worth noting that current review would be used as an outcome indicator for verifying the after effects of both cognitive and educational after the usage of these educational serious games.

• 한국HCI학회:학술대회논문집
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• 2008.02a
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• pp.342-347
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• 2008

Face tracking and recognition are difficult problems because the face is a non-rigid object. If the system tries to track or recognize the unknown face continuously, it can be more hard problems. In this paper, we propose the method to track and to recognize the face of the unknown person on video sequences using linear combination of nonlinear manifold models that is constructed in the system. The arbitrary input face has different similarities with different persons in system according to its shape or pose. Do we can approximate the new nonlinear manifold model for the input face by estimating the similarities with other faces statistically. The approximated model is updated at each frame for the input face. Our experimental results show that the proposed method is efficient to track and recognize for the arbitrary person.

• Journal of the Korean Society for Precision Engineering
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• v.23 no.12 s.189
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• pp.7-15
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• 2006

• The Korean Journal of Applied Statistics
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• v.24 no.5
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• pp.883-891
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• 2011

For survival data we sometimes want to test a log normality hypothesis that can be changed into normality by transforming the survival data. Hence the Shapiro-Wilk type statistic for normality is generalized to randomly censored data based on the Kaplan-Meier product limit estimate of the distribution function. Koziol and Green (1976) derived Cram$\acute{e}$r-von Mises statistic's randomly censored version under the simpl hypothesis. These two test statistics are compared through a simulation study. As for the distribution of censoring variables, we consider Koziol and Green (1976)'s model and other similar models. Through the simulation results, we can see that the power of the proposed statistic is higher than that of Koziol-Green statistic and that the proportion of the censored observations (rather than the distribution of censoring variables) has a strong influence on the power of the proposed statistic.

• Journal of Korean Society of Forest Science
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• v.106 no.2
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• pp.213-218
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• 2017

The purpose of this study was to develop age-biomass model in Chungnam region containing random effect. To develop the biomass model by species and tree component, data for Pinus densiflora in central region is collected to 30 plots (150 trees). The mixed model were used to fixed effect in the age-biomass relation for Pinus densiflora, with random effect representing correlation of survey area were obtained. To verify the evaluation of the model for random effect, the akaike information criterion (abbreviated as, AIC) was used to calculate the variance-covariance matrix, and residual of repeated data. The estimated variance-covariance matrix, and residual were -1.0022, 0.6240, respectively. The model with random effect (AIC=377.2) has low AIC value, comparison with other study relating to random effects. It is for this reason that random effect associated with categorical data were used in the data fitting process, the model can be calibrated to fit the Chungnam region by obtaining measurements. Therefore, the results of this study could be useful method for developing biomass model using random effects by region.