• Proceedings of the Korean Information Science Society Conference
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• 2005.11b
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• pp.703-705
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• 2005

지능형 에이전트란 환경상태를 인지하고 상태정보에 따른 적절한 행위를 자동적으로 수행하는 소프트웨어 객체를 말한다. 본 논문에서는 시맨틱 웹 등장에 따른 시맨틱 서비스를 지능적이고 자동적으로 수행하는 에이전트의 개발에 대해 제안한다. 본 논문에서는 제안하는 시맨틱 서비스 에이전트는 다음과 같은 핵심 요소 기술의 특징을 갖는다. 첫째, 시맨틱 웹 환경의 온톨로지와 메타데이터 및 사용자 프로파일을 자원으로 사용하여 상태정보를 인지하고 행동한다. 둘째, SWRL(Semantic Web Rule Language)기반의 추론엔진을 바탕으로 추론을 통한 지능적인 행동을 수행한다. 셋째, 시맨틱 웹 환경의 확장을 통한 에이전트의 활동 범위를 증가시키기 위해서 메타데이터의 저작기능을 갖는다. 넷째, 시맨틱 서비스 에이전트는 온톨로지 서버 및 시맨틱 미들웨어를 통한 시맨틱 웹 인프라 시스템의 프레임워크를 갖는다. 본 논문에서는 시맨틱 서비스 에이전트의 실제 구현을 통해서 시맨틱 웹 환경이 제공하는 자원을 적극 이용하고 이를 사용자에게 지능적이고 자동적인 서비스로 제공하는 에이전트를 제안한다.

• Korean Journal of Cognitive Science
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• v.22 no.2
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• pp.145-172
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• 2011

Prospective memory (PM) is memory for activities to be performed in the future, such as remembering to purchase a piece of fruit on the way home or remembering to give someone a telephone message. Theoretically, PM retrieval can be accomplished either by controlled monitoring of intended action or by a more automatic process that spontaneously responds to the presence of intended event. The present study examined the effect of meta-cognitive awareness in PM retrieval process. In Experiment 1, we manipulated PM condition with a salient cue to stimulate participants' meta-cognitive awareness. Results showed the salient cue condition spontaneously triggered remembering to perform an intended action. In Experiment 2, we manipulated participants' meta-cognitive awareness about PM task difficulty and about the degree to which cognitive capacity is required to realize the PM task. Results showed that PM retrieval process varied with meta-cognitive awareness (i.e., more resources were allocated if the PM task was expected to be difficult). These results imply that participants' meta-cognitive awareness play an important role in PM retrieval process.

• Journal of Advanced Navigation Technology
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• v.13 no.2
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• pp.201-207
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• 2009

Recently effective spectrum resource technologies have been studied using a game theorectical approach for cognitive radio networks. Radio resource management is required an effective scheme because the performance of a radio communication system much depends on it's effectiveness. In this paper, we suggest a game theoretical algorithm for adaptive power control which is required an effect scheme in cognitive radio networks. It will be a distributed network. In the network distributed cognitive radio secondary users require an adaptive power control. There are many results which are suggested some possibility of game theoretical approaches for communication resource sharing. However, we suggest a practical game algorithm to achieve Nash equilibrium of all secondary users using a Nash equilibrium theorem in this paper. Particularly, a game model was analyzed for adaptive power control of a cognitive radio network, which is involved in DSSS (Direct Sequence Spread Spectrum) techniques. In case of K=63 and N=12 in the DSSS network, the number of iteration was less than maximum 200 using the suggested algorithm.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.6
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• pp.9-15
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• 2010

Cognitive radio is a technology, which automatically recognizes and searches for temporally and spatially unused frequency spectrum, then actively determines the communication method, bandwidth, etc. according to the environment, thus utilizing the limited spectrum resources efficiently. In this paper, with the imperfect sensing of misdetection and false alarm, we quantitatively investigate the effects of primary and secondary user's queue on the primary and secondary users' spectrum usage through the analysis of continuous time Markov Chain. With the queue primary user's spectrum usage improved up to 18%, and the secondary user's spectrum usage improved up to 50%.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.6
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• pp.1-8
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• 2010

Wireless multimedia service through the access to mobile telephone network or data network is a vital part of contemporary life, and the demand for frequency spectrum for new services is expected to explode as the ubiquitous computing proliferate. Cognitive radio is a technology, which automatically recognizes and searches for temporally and spatially unused frequency spectrum, then actively determines the communication method, bandwidth, etc. according to the environment, thus utilizing the limited spectrum resources efficiently. In this paper, we investigate the effects of imperfect sensing, misdetection and false alarm, on the primary and secondary users' spectrum usage through the analysis of continuous time Markov Chain. We analyzed the effects of the parameters such as sensing error, offered load on the system performance.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39A no.9
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• pp.557-559
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• 2014

We propose an efficient resource allocation scheme based on interference awareness for D2D (Device-to-Device) communication in cellular networks. Recently, many researchers have studied how to allocate frequency resources to DUE (D2D User Equipment) with full interference channel information. However, it is difficult to assume a scenario where instantaneous interference information between the CUE (Cellular UE) and DUE is known to the BS (Base Station). To tackle this problem, we proposed in this paper a new scheme in which the BS allocates a resource to CUE and DUE without a full channel information and can aware interference based on only transmit power and distance between UEs. Simulation results show effectiveness of the proposed scheme.

• The Journal of the Korea Contents Association
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• v.16 no.5
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• pp.242-250
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• 2016

This study was conducted to investigate whether Stroop-related cognitive task will be affected according to the preceding affective valence factored by matchedness in response time(RT) and whether facial recognition will be indexed by specific event-related potentials(ERPs) signature in normal person as in patients suffering from affective disorder. ERPs primed by subliminal(30ms) facial stimuli were recorded when presented with four pairs of affect(positive or negative) and cognitive task(matched or mismatched) to get ERP effects(N2 and P300) in terms of its amplitude and peak latency variations. Behavioral response analysis based on RTs confirmed that subliminal affective stimuli primed the target processing in all affective condition except for the neutral stimulus. Additional results for the ERPs performed in the negative affect with mismatched condition reached significance of emotional-face specificity named N2 showing more amplitude and delayed peak latency compared to the positive counterpart. Furthermore the condition shows more positive amplitude and earlier peak latency of P300 effect denoting cognitive closure than the corresponding positive affect condition. These results are suggested to reflect that negative affect stimulus in subliminal level is automatically inhibited such that this effect had influence on accelerating detection of the affect and facilitating response allowing adequate reallocation of attentional resources. The functional and cognitive significance with these findings was implied in terms of subliminal effect and affect-related recognition modulating the cognitive tasks.

• Journal of the Korean Society for information Management
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• v.22 no.1 s.55
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• pp.209-228
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• 2005

This study is a preliminary work in examining how to manage resources for collaboratively interactive help systems. The purpose of this article is to describe significant patterns of behaviors and cognitive state in collaborative problem-solving situation, and further to explore the relationship between the behavior and the perception of service evaluation. Based on the concept of 'cognitive motion' in Dervin's Sense-Making theory, this study conducted a time-line interview. The sample of this study consists of 22 IT personnel helping other person solve IT problems and 36 users being helped for a IT problem-solving. This study presents a model of collaborative problem-solving behaviors and discusses some implications for designing help systems which collaborative interactions can happen.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.941-944
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• 2011

모바일 클라우드 서비스는 사용자가 모바일 단말에 자원을 가지고 있지 않더라도 인터넷을 통해 외부의 다양한 IT 자원을 제공하는 서비스로서 모바일 단말이 가지는 성능적 한계를 극복시킬 수 있다는 장점과 함께 이용자 수가 증가하고 있다. 그러나 클라우드 컴퓨팅 환경에 존재하는 개인 및 기업의 정보 유출과 같은 문제들은 모바일 클라우드 컴퓨팅 환경에도 그대로 상속되기 때문에 이러한 문제에 대응하기 위해서는 모바일 클라우드 컴퓨팅 환경에서 정보유출을 탐지할 수 있는 이상행위 탐지 알고리즘이 마련되어야 한다. 여기서 이상행위란, 모바일 클라우드 자원에 접근하는 방법에 있어 기존에 인지하고 있던 정상적인 행위에서 벗어나는 행위를 의미하며 이상행위로 판단되는 상황이 발생되는 경우, 이를 정보유출이 발생할 수 있는 상황으로 인지함으로써 적절한 대응을 할 수 있게 된다. 따라서 본 논문에서는 모바일 클라우드 자원의 정보유출을 방지하기 위한 목적으로 자원 접근에 대한 이상행위 탐지 알고리즘 개발 모델을 제시한다. 이상행위 탐지 알고리즘을 개발하고 이를 검증하기 위해서는 이상행위를 일으키는 공격 모델 및 대응 모델이 개발되어야 한다. 따라서 본 논문에서는 인증 및 권한관리의 취약점을 이용하여 위협을 일으키는 공격 모델을 개발하는 방법을 제시하고, 사용자의 접속환경 및 클라우드 자원의 정보 흐름을 분석함으로써 이상행위를 탐지하는 알고리즘을 제시한다.

• Korean Journal of Social Welfare
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• v.64 no.2
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• pp.133-158
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• 2012

In the modern society, a growth in the non-profit sector and a decrease in the government budget on social welfare result in a greater need of individual giving and volunteering. Therefore, in order to manage non-profit organizations effectively, it is necessary to encourage citizen participation in giving and volunteering through identifying various factors affecting giving and volunteering. In order to identify what factors are affecting participation in giving and volunteering and whether the relationship between giving and volunteering is multiplicative or compensatory, this study uses multinomial logistic regression analysis by categorizing four groups based on the participation types of giving and volunteering. The research findings confirmed that common factors such as religion and satisfaction with leisure time were still significant, and specific factors were also found among factors affecting participation in giving and volunteering. Especially, this study identified that factors affecting giving and volunteering differ according to household income, education level, employment status, gender and social relationship satisfaction. The findings confirmed that giving and volunteering are compensatory behaviors. Finally, the implications of this study were discussed. A differential strategy for giving and volunteering is needed to encourage citizen participation in non-profit organizations.