• The Journal of Korean Institute of Communications and Information Sciences
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• v.37C no.11
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• pp.1112-1128
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• 2012

In cognitive radio networks, secondary users are allowed to utilize the channels currently not occupied by primary users opportunistically. Secondary users can communicate with each other using the commonly available channels (common channels) which may change dynamically based on the activity of the primary users. Even though many studies have dealt with cognitive radio behaviors, the detailed procedures for common channel configuration have not been paid much attention. In this paper, the fast and reliable dynamic common channel setup and reconstruction method for the point-to-point communications in military cognitive radio networks is proposed. The detailed time parameters are considered for common channel setup and reconstruction, such as the packet exchange time, channel request waiting time, and rendezvous time. Through numerical analyses, the delay and throughput performance of the proposed method is derived and evaluated.

• Journal of Fisheries and Marine Sciences Education
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• v.19 no.3
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• pp.415-428
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• 2007

본 연구는 인지양식이 온라인 학습의 성취도에 영향을 미치는 요인중의 하나라는 선행연구 결과들을 토대로, 인지양식이 온라인 정보탐색능력에도 영향을 미치는지 그리고 어떤 다른 개인적인 특성들이 온라인 정보탐색행위와 연관성이 있는지 고찰 하였다. 연구 대상은 대학원 석사과정과 박사과정에 재학중인 학생 36명이었으며, 인지양식검사와 Ellis와 Haugan (1997)의 정보탐색행위 모델에 근거하여 연구자에 의해 제작된 설문조사를 실시하였다. 학생들에게 연구 주제를 주고 온라인상에서 정보를 탐색하도록 시켰으며, 이들의 정보탐색행위 과정과 특성을 관찰하고 기록하였다. 인지양식검사 결과와 설문조사 결과를 양적 분석하고, 정보탐색행위 과정과 특성에 관한 질적 분석한 결과에 의하면, 개인의 인지양식과 온라인시스템을 이용한 정보탐색능력과는 아무런 상관관계가 없었다. 반면에, 정보탐색행위는 컴퓨터 이용 능력, 온라인 도서관 시스템 사용경험/능력과 상관관계를 보였다. 또한 검색한 정보에 대한 만족도는 정보탐색에 보내는 시간과 반비례 상관관계를 가지며, 대부분의 학습자들이 총 8단계의 정보탐색과정 중 " Browsing" 단계에 대부분의 시간을 보내는 것으로 관찰 되었다. 끝으로 대부분의 학생들이 도서관 시스템 사용능력에 높은 효능감을 보였지만, 학교 온라인도서관 시스템이 사용하기 편리하지 않도록 설계되어있다고 대답했으며, 자신들의 연구를 위해서 인터넷 검색엔진보다는 도서관 데이터베이스를 더 자주 사용하고 있는 것으로 나타났다.

• Korean Journal of Psychosomatic Medicine
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• v.5 no.1
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• pp.89-96
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• 1997

This study was designed to determine whether cognitive impairment was evident in patients with SLE. Also, it aimed to examine the association of cognitive impairment with other clinical variables. The subjects consisted of 20 patients with mildly active SLE and 20 healthy controls. Methods : A total of 20 SLE patients and 20 normal controls completed a computerized neuropsychological test battery using Vienna Test System. These included Cognitrone test, Continuous attention test, Corsi block tapping test, Standard progressive matrices. Also, neuro-behavioral cognitive status examination was done. The symptom severity of depression was measured with Beck Depression Inventory, Hamilton Depression Rating Scale, and current medications were documented. Disease activity was rated using the SLE diasease activity index (SLEDAI). Results : SLE patients had poorer performance than normal controls on the tests of Cognitrone, attention, nonverbal IQ and memory, independent of age, education, disease activity, steroid use and depression status. Conclusion : Cognitive dysfunction was not uncommon in ambulatory SLE patients as measured by standardized neuropsychological tests. It seemed to occur independently of various clinical variables. These findings would suggest that cognitive dysfunction in SLE may be explained by reflecting subclinical central nervous system(CNS) involvement, rather than coexisting psychological distress due to chronic illness or side effect of medication.

• 한국정보교육학회:학술대회논문집
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• 2010.01a
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• pp.31-35
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• 2010

현대 지식정보화 사회에서 학생들의 자기 주도적 학습능력을 중시하는 시대적 요구에 따라 본 연구에서는 스크래치 프로그래밍 교육을 통하여 학생들의 자기 주도적 학습능력에 가장 많은 영향을 미치는 상위인지능력을 향상시키기 위한 방안을 제시하고자 한다. 기존의 여러 교육용 프로그래밍 교육은 그 자체의 기능을 익히는데 너무 많은 시간과 노력이 소요되어 정작 프로그래밍 교육을 통해 얻고자 하는 것을 얻기에는 부족함이 많이 있었다. 하지만 최근 개발된 교육용 프로그램 스크래치는 기존에 교육용 프로그램이 갖고 있던 여러 가지 단점을 보완하고 보다 쉬운 프로그래밍 교육을 통해 논리력이나 문제해결력 같은 고인지 사고능력을 길러줄 수 있다. 자신의 인지상태를 탐색하고 학습 혹은 문제 해결 과정에 필요한 인지적 자원을 분석하며 능동적으로 조정하는 인지적 상호작용의 총합인 상위인지능력의 향상에 중점을 둔 스크래치 프로그래밍 교육을 통해 학생들의 상위인지능력을 향상시킬 수 있을 것으로 기대된다.

• Proceedings of the KAIS Fall Conference
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• 2012.05a
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• pp.60-63
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• 2012

우리나라의 병원 전 응급의료체계는 비교적 짧은 기간 동안에 소방서를 축으로 운영되고 있다. 병원 전 단계에서 응급처치의 적절성을 높이기 위해서는 119구급대에 의한 응급처치에 대하여 체계적으로 조사를 시행함으로써 기초 응급의료에 대한 지속적인 질 관리를 해 나가는 것이 매우 중요하다. 특히 뇌경색은 급성기 치료를 위하여 혈전용해제 치료가 중요하며 증상 발현 후 치료가 시작되기까지의 소요시간이 매우 중요하므로 뇌경색 환자의 발생과 동시에 응급의료체계의 반응시간과 뇌경색을 인지하기 위한 환자평가 및 인지 후 응급처치 정도를 소방 119구급서비스를 통하여 살펴보고자 한다.

• Proceedings of the Korean Nuclear Society Conference
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• 1998.05a
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• pp.239-245
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• 1998

GOMS 평가는 운전원 개인의 인지과정에 초점을 두어 직무 절차의 학습시간과 직무 실행시간을 예측하고 직무 실행시 요구되는 인지부하를 분석한다. 하지만 실제 원전의 운전은 그룹에 의해 이루어지므로 운전원간 의사소통과 직무의 상호 의존관계를 고려하여 기존의 GOMS를 확장한 분산형 GOMS를 고안하였다. 본 논문에서는 분산형 GOMS 평가기법을 CE형 원전의 비상운전절차서에 시험적으로 적용해 본 결과를 제시한다.

• Science of Emotion and Sensibility
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• v.25 no.1
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• pp.55-66
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• 2022

Many studies have shown that musical dissonance generally evokes negative affect, but few studies detail how distinct dissonant intervals, ranging in various roughness, influence emotions and cognition. This research entailed two experiments to confirm whether varying musical intervals of dissonance trigger particular negative emotions and increase cognitive interference. Experiment 1 assumed that different dissonant intervals would elicit distinct negative emotions. In a survey involving 131 participants, there was an overwhelming consensus that dissonant intervals elicited stronger high arousal negative affect than low arousal negative affect. The major 7th degree was found to evoke a significantly stronger feeling of scared. Experiment 2 investigated whether emotions-affecting dissonance would have an enhancing effect on cognitive interference. According to a color-word Stroop task conducted on 81 participants, the presence of any dissonant sound caused significantly higher reaction times and error rates than in the absence of sound. In particular, the minor 2nd degree was cognitively the most disruptive and associated with the slowest reaction times. This paper shows how different ranges of dissonance can effectively influence negative affect and heighten cognitive interference.

• Journal of Digital Convergence
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• v.18 no.12
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• pp.343-351
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• 2020

The present study investigated the related variables of cognitive function, subjective cognitive decline and cognitive training effects. The cognitive training was composed of mete-cognitive education and cognitive task performing. Twenty older adults attended for 14 weeks and were tested before and after the training. Results show that their cognitive level was related with age, self-esteem and personality traits. And subjective cognitive decline was related depression, anxiety, personality traits, self-efficacy, self-esteem and subjective age, but it does not reflect objective cognitive impairments. Their cognitive test scores were enhanced after training in MMSE, memory and executive function, and enhanced scores were related with age, subjective cognitive decline, anxiety, self-efficacy, self-esteem, subjective age and personality traits. Findings suggest one's personality and psychological state need to be considered for the effects of cognitive training.

• 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.

• 한국노년학
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• v.37 no.4
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• pp.813-833
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• 2017

The purpose of this study was to classify the results of previous studies on the cognitive function improvement program of the elderly into the cognitive impairment group and the normal group to compare the effect sizes of the groups using meta - analysis. Among the previous studies on cognitive function improvement programs reported in Korea for the last five years, 86 were selected and the effect sizes were summarized using meta-analysis. As a result of the study, the overall average effect size showed a large effect size in both groups. The effect sizes of the intervention types were high for the cognitive impairment group, and the exercise and cognitive-based interventions were similar for the normal group. The gender effect size was higher for the women with cognitive impairment group, and higher for the combined case with normal group. The effect sizes according to group size were higher for 20 persons in cognitive impairment group and higher for 21~40 persons in normal group. The total number of sessions in both groups was higher than 32 times, The number of sessions per week was 3 times for the cognitive impairment group, 4 to 6 times for the normal group. The duration of activity was 55~60 minutes in cognitive impairment group and 70~180 minutes in normal group as the number of sessions and activity time increased the effect size was higher in normal group. This study will be meaningful in that it provided basic data necessary for future program development by comparing and analyzing the effect sizes of the cognitive function improvement program type and the activity factors between the cognitive impairment group and the normal group.