• Proceedings of the KAIS Fall Conference
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• 2010.11a
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• pp.43-46
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• 2010

최근 뇌에 대한 연구가 활발히 진행되고 있으며 뇌 기능의 중요성이 부각됨에 따라서 뇌 기능과 관련한 인지능력에 대한 관심이 높아지고 있다. 인지능력은 정보의 입력, 처리, 저장 및 검색 등 광범위한 지적 능력을 가리키고 기억력, 주의력, 집중력 등이 포함된다. 하지만 이러한 인지능력의 중요성에도 불구하고 인지능력을 증진시키고 회복시키기 위해 많은 시간을 할애할 수 없다. 이는 현대의 사회적 환경과 시간적, 공간적인 제약이 많기 때문이다. 본 논문에서는 휴대성과 시간의 효율성을 고려하고 사용자에게 다양한 기능을 제공할 수 있는 스마트폰을 활용하여 인지능력 진단 및 증진을 할 수 있도록 시스템을 설계 및 구현하였다.

• Proceedings of the Korean Society for Cognitive Science Conference
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• 2000.05a
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• pp.214-219
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• 2000

최근 들어 많은 사람들이 네트워크를 이용하여 다양한 경험을 하고 있다. 특히 온라인게임의 경우 더욱 더 많은 사람들이 더 오랜 시간동안 게임을 즐기고 있다. 본 연구는 Flow 이론을 중심으로 왜 사람들이 온라인 게임 속에 오래 머물러 있는가에 대해 분석하였다. 온라인 설문을 통해 사용시간과 Flow 상태와의 관계를 분석한 결과 Flow의 4가지 차원 중에서 Intrinsic interest와 Curiosity를 많이 느끼면 그에 따라 온라인 게임을 이용하는 시간이 늘어간다는 것을 알 수 있었다. 그렇다면 온라인 게임을 통해 사람들에게 Intrinsic interest와 Curiosity를 많이 느끼게 하기 위해 어떻게 해야하는지를 본 연구에서는 인지적 재미와 지각적 재미라는 이론을 이용하여 분석하였다. 분석 결과 사람들은 인지적 재미와 지각적 재미를 많이 제공해 주면 줄수록 Intrinsic interest와 Curiosity를 많이 경험할 수 있게 해 준다는 것을 알 수 있었다.

• Proceedings of the Korean Society for Cognitive Science Conference
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• 2000.05a
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• pp.209-213
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• 2000

흥미는 학습을 비롯한 여러 인지 과제 수행에 있어서 중요한 변인이 된다. 그러나 그 개념의 모호성이나 측정 가능성에 대한 문제 등으로 인해서 이에 대한 직접적인 연구가 부족한 것이 현실이다. 본 연구에서는 컴퓨터 게임의 상황에서 발생하는 흥미와 관련된 변인으로서 주관적 시간 지각과 flow 경험에 대한 설문을 통해서 흥미관련요인을 알아보고자 하였다. 게임에서의 흥미의 경험이 실제 시간보다 짧은 주관적 시간 지각의 왜곡으로 나타날 것이며 flow와 관계된 요인들이 결국 흥미 유발에 유의한 관련성이 있을 것이라고 기대되었다. 결과에 따르면 주관적 시간 지각이 흥미의 정도에 따라 차이가 있는 것으로 나타났으며, 도전감, 주의, 시간 왜곡감, 기술, 각성 등의 변인도 흥미와 관련된 것으로 나타났다. 또한 네트웍과 개인 조건에 따른 흥미와 시간의 왜곡감, 전략, 시간 지각의 차이도 역시 유의하였다.

• The Journal of the Korea Contents Association
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• v.11 no.11
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• pp.413-423
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• 2011

Service environments are known to have effects on quality recognition in fine-dining and family type restaurants. The current study explores that the effects are also likely in the fast-food type ones. To verify the research method factor and reliability analysis of SPSS version 18.0 are applied. The program is also used to test the influences among variables. With multiple regression analysis the study finds that there is a significant effect of service environment on quality recognition in fast-food type restaurants. The study also finds that employees' uniform and cleanliness are more influential than waiting time which is generally known as a key factor in fast food service restaurants.

• Science of Emotion and Sensibility
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• v.6 no.3
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• pp.63-72
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• 2003

This study investigated how cognitive style and training context influenced visual discrimination skill acquisition and transfer under time pressure. This experiment consisted of a screening session, a training session, and a transfer session using random polygon comparison tasks. Screening session was designed to separate participants according to their cognitive style (analytic or holistic). Training session was divided into difficult and easy conditions. In transfer session, participants compared polygon pairs in a novel task. The stimuli were presented for 1.5 seconds to examine the influence of time pressure. Through the all sessions, this experiment measured accuracy and response time. According to the results of this study, analytic group responded as quickly as holistic group in the beginning of training session because time pressure induced them to the holistic strategy. However, as training session progressed, their slopes of reaction time increased, suggesting that their own analytic style emerged. Holistic group showed flatter slopes than did analytic group for training session. Of interest is the slopes increased at the beginning of transfer session, suggesting that they developed analytic strategies in difficult training context. It is suggested individuals differently develop strategic processing skills depending on cognitive styles even under time pressure.

• Korean Journal of Cognitive Science
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• v.20 no.2
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• pp.155-181
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• 2009

Psychophysiologists are often interested in the EEG signals that accompany certain psychological events. When one is interested in a time series of event-related changes in EEG, one focuses on examining how the waveforms recorded at individual electrode sites vary over time across one or more experimental conditions. This is an analysis of event-related potentials (ERPs). In addition to such a classical EEG analysis in the time domain, the EEG measures can be investigated in the frequency domain. Moreover, it has been demonstrated that spectral analyses can often yield significant insight into the functional cognitive correlations of the signals. Therefore, this review paper tries to summarize essential concepts (e.g. phase-locking) and conventional methods (e.g. wavelet transformation) for understanding spectral analyses of brain oscillatory activity. Phase-coherence is also introduced in relation to functional connectivity of the brain.

• 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.

• Proceedings of the Korea Society for Industrial Systems Conference
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• 1998.10a
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• pp.671-688
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• 1998

본 논문은 작업그룹의 과업을 수행하는 인지적 과정을 분석하는 방안을 제시한다. 먼저, 그룹의 인지현상을 연구하는 분산인지이론을 검토하고, 기존의 개인 과업 분석 방법론중의 하나인 GOMS를 확장하여 그룹에 적용할 수 있는 분산형 GOMS 방법론을 제안한다. 제안한 분산형 GOMS 방법론을 작업그룹의 실제 사례인 원자력 발전소의 주 제어실 운전반의 한 과업에 시험적으로 적용하여 분석해 본 결과를 제시한다. 각 구성원의 업무 수행 시간, 의사소통시간, 최대인지 부하등을 기초로 작업그룹의 업무 수행시간과 인지 부하의 ？형도를 계산하여 그룹의 과업에 대해 분석하였다.

• Korean Journal of Cognitive Science
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• v.23 no.1
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• pp.25-46
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• 2012

When performing a monotonous task, one often experiences an urge to quit. This urge may vary depending on how long one has performed the task (a temporal factor) and on which particular component of the task one is carrying out (an event-based factor). Using the Stroop task and a working memory task, we examined changes in the urge to quit as a function of basic temporal (repetition) and event-based (cognitive conflict) factors. Consistent with the law of least work and recent theorizing, for the memory task, urges to quit were greater following difficult trials; for the Stroop task, urges to quit were greater following incongruent than congruent trials, but only during early/novice phases of performance, when responding is inefficient. This is a demonstration of an avoidance response toward cognitive conflict. Regarding temporal sources of quitting, urges to quit were greater for late task stages than early stages. These basic findings may illuminate the nature of the more 'hot' motivational struggles involving the delay of gratification.

• Korean Journal of Cognitive Science
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• v.29 no.3
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• pp.161-192
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• 2018

Retrieving temporal information of encoded events is one of the core control processes in episodic memory. Despite much prior neuroimaging research on episodic retrieval, little is known about how large-scale connectivity patterns are involved in the retrieval of sequentially organized episodes. Task-related functional connectivity multivariate pattern analysis was used to distinguish the different sequential retrieval. In this study, participants performed temporal episodic memory tasks in which they were required to retrieve the encoded items in either the forward or backward direction. While separately parsed local networks did not yield substantial efficiency in classification performance, the large-scale patterns of interactivity across the cortical and sub-cortical brain regions implicated in both the cognitive control of memory and goal-directed cognitive processes encompassing lateral and medial prefrontal regions, inferior parietal lobules, middle temporal gyrus, and caudate yielded high discriminative power in classification of temporal retrieval processes. These findings demonstrate that mnemonic control processes across cortical and subcortical regions are recruited to re-experience temporally-linked series of memoranda in episodic memory and are mirrored in the qualitatively distinct global network patterns of functional connectivity.