• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.7 no.2
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• pp.81-91
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• 2008

In mobile wireless communications, there is a new approach that uses the lacking spectrum efficiently. A cognitive radio is a device that can changes its transmitter parameters based on interaction with the environment in which it operates. At present, the wireless communication standard for wireless device contains power-saving modes or energy efficient mechanisms which cuts off the power of transmitter and receiver for power-saving. However, in cognitive radio environment, every device has the Quiet Period for searching channel and existing energy-saving method is not appropriate to be adjust to cognitive radio environment. In this paper, we propose an energy-efficient MAC protocol of mobile device in cognitive radio environment and prove the improvement of proposed method.

• Korean Medical Education Review
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• v.22 no.2
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• pp.57-66
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• 2020

The purpose of this study was to examine teaching strategies from cognitive learning theory applied to medical education and to present specific applications of the strategies and cases. The results of this study yielded (1) seven teaching strategies and specific sample activities that instructors can use based on learning processes in medical schools; (2) nine instructional events to which cognitive learning strategies were applied; (3) principles of curriculum design from a cognitive perspective; and (4) instruction cases employing cognitive teaching strategies. Cognitive learning theory has two implications: first, if instructors in medical schools apply the results of the study to design a class and curriculum, it would be possible for them to minimize cognitive loading of the learners that may stem from ineffective teaching strategies or curricula; second, cognitive teaching strategies that seek improvement in thinking skills could provide useful teaching strategies for medical education, which aims to develop experts with high-level thinking processes. In this sense, cognitive learning theory is not an out-of-date learning theory, but one that can be effectively applied in current medical education.

• Journal of The Korean Association For Science Education
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• v.22 no.5
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• pp.923-943
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• 2002

The purpose of this study was to investigate the relation between the levels of cognitive conflict and students' conceptual change. In this study, 30 Korean high school students were selected from 450 10th graders by examining the pretest results. Two different strategies were used to induce cognitive conflicts in students, an anomalous or conflict situations; demonstrations and logical arguments against students' preconception. After arousing the students' cognitive conflict, the level of cognitive conflict was rated. Pretest, post-test and delayed post-test were administered to check the conceptual change. The tests consisted of 5 items in mechanics and electricity, respectively. Therefore, the demonstration method showed effective conceptual change, more than the logical argument method did. Students changed their conceptions more easily and frequently in the area of mechanics than in electricity. Students who showed higher levels of cognitive conflict indicated more positive conceptual change than those who showed lower conflict levels. 59 cases (56%) out of 105 who experienced high levels of cognitive conflict were changed into scientific conceptions one month later; however only 16 cases (35%) out of 46 who experienced low levels of cognitive conflict changed into scientific conceptions. Students who experienced higher levels of cognitive conflict showed higher rates of conceptual change. It could be concluded that designing instruction to induce cognitive conflict is a useful strategy to promote conceptual change.

• Osong Public Health and Research Perspectives
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• v.8 no.5
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• pp.308-317
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• 2017

Objectives: We aimed to examine the effects of various leisure activities on cognitive impairment in young-old (aged 65-74 years) and old-old (aged ${\geq}75$ years) adults. Methods: In total, 10,279 elderly Korean individuals from the 2014 Korean National Survey on Older Adults' cohort were enrolled in our study. Cognitive impairment was assessed using the standardized score of the Mini-Mental State Examination for Dementia Screening, whereas leisure activities were recorded via self-reporting of the extent and type of leisure activity the subjects involved in over the past year. Multivariate logistic regression was used to assess the effect of leisure activities on cognitive impairment, while controlling for potential covariates. Results: The subjects were more likely to participate in cognitive activities than in non-exercise physical activities. After controlling for selected covariates, involvement in cognitive activities was found to be a significant predictor of cognitive impairment in both the groups, whereas involvement in non-exercise physical activities was not a predictor of cognitive impairment in individuals aged ${\geq}75$ years. Moreover, depressive symptoms, rural residence, and hearing difficulties were common predictors of cognitive impairment among elderly-Korean-individuals. Conclusion: Leisure activity involvement may help delay cognitive impairment, which is often concomitant with aging. Hence, an early intervention service may significantly benefit both young-old and old-old individuals.

• Physical Therapy Rehabilitation Science
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• v.11 no.4
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• pp.571-578
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• 2022

Objective: Cognitive-motor trainings had a positive impact on cognitive function and dual-task trainings led to improvements of global cognitive function. The brain activity of the prefrontal cortex (PFC) is another indicator that can infer cognitive function. This study aims to confirm the usability of the interactive system cognitive-motor training program and the changes in the prefrontal cortex through training. Design: Cross-sectional study Methods: In this study, two cognitive tasks were randomly applied to 20 adults as cognitive-motor training using an interactive system, and the same task was performed using the original method. During all tasks, the brain activity of the prefrontal cortex was measured by the change in oxyhemoglobin (HbO) in real-time using Functional Near-Infrastructure. After performing the tasks, the usability of the developed interactive system was evaluated by a usability questionnaire which consists of five items, and each item consists of a 7-point Likert scale that responds from 1 point to 7 points. Results: The HbO levels were increased during cognitive task performance than at the resting phase. And evaluating the usefulness of the interactive system, a questionnaire result showed that it would be useful for cognitive-motor programs. Conclusions: The cognitive-motor training using the interactive system increased the activity of the prefrontal cortex, and the developed wearable sensor-based interactive system confirmed its usefulness.

• Journal of Korean Academy of Nursing
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• v.45 no.1
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• pp.118-128
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• 2015

Purpose: Evidence suggests that some patients with breast cancer experience cognitive difficulties following chemotherapy. This longitudinal study was done to examine the prevalence of cognitive impairment and trajectory of cognitive function over time in women with breast cancer, who received adjuvant chemotherapy. Methods: Participants were 137 patients with breast cancer. They completed neuropsychological tests and the Functional Assessment of Cancer Therapy-Cognitive Function before adjuvant therapy (pretest), toward the end of adjuvant therapy (posttest), and 6 months after the completion of adjuvant therapy (follow-up test). Of the patients, 91 were treated with adjuvant chemotherapy and 46 patients who did not receive chemotherapy made up the comparison group. A reliable-change index and repeated-measure ANOVA were used for statistical analyses. Results: At the posttest point, over 30% of patients showed complex cognitive impairment and reported greater difficulty in subjective cognitive function. At the follow-up test point, 22.0% of patients exhibited complex cognitive impairment and 30.8% of patients complained of subjective cognitive impairment. Repeated-measure ANOVA showed significant decreases after receiving chemotherapy followed by small improvements 6 months after the completion of chemotherapy in cognitive domains of change for attention and concentration, memory, executive function, and subjective cognitive function. Conclusion: These results suggest that chemotherapy in patients with breast cancer may be associated with objective and subjective cognitive impairments. Further studies are needed to explore the potential risk factors and predictor of chemotherapy-related cognitive changes. Also nursing interventions for prevention and intervention of cognitive impairments should be developed and tested.

• Journal of The Korea Institute of Healthcare Architecture
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• v.24 no.1
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• pp.25-32
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• 2018

Purpose: This study was conducted to figure out the cognitive characteristics of the elderly living in apartment complex in order to construct basic data for the design of sustainable and age friendly apartment area. Methods: Cognitive map was used to identify and analyze the elderly residents' status of residential environment cognitions. The elderly living in Gongreung-dong apartment was randomly interviewed outdoor area and requested to draw cognitive maps on their living environment. 26 valid cognitive maps collected were analyzed, classified into two different types: Line type and Dot type. The average age, cognitive distance, length of residence, number of elements in the map(complexity) were then compared by Line and Dot type, as well as by gender. Correlations among variables also were analysed. Results: Males showed a tendency to draw dot types, which means they are place-centered, and females drew line types more than males, which means they are way-centered. The average cognitive distance of male group was greater than that of female group. As the age went up, the number of perceived place and the cognitive distance decreased. Oder people tended to draw line types rather than dot types. As the cognitive distance was longer, the perceived place and the number of lines increased. Implications: The age was more related to the recognition of the residential environment. The younger the residents were, the more they recognized the elements. The points that were represented by dots in the cognitive maps are places for memories for the individuals. Creating more memorable spaces will affect the cognition of residents on living environment. It is better to improve the cognitive environments before cognitive abilities of residents decrease.

• Korean Journal of Biological Psychiatry
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• v.13 no.3
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• pp.144-151
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• 2006

Objectives : Cognitive therapy is the most extensively researched psychological treatment for nonpsychotic unipolar outpatient depressive disorders. This review focused on the utility of this approach in severe or chronic depressive disorders, in relapse prevention and also on the potential benefits of combining cognitive therapy with medication. Methods : The author reviewed original studies and quantitative analyses on the effects of cognitive therapy, predictors of response, and neuroimaging studies of cognitive therapy in major depressive disorder. The sources used for the literature search were data bases : PubMed, EMBASE, CDSR on the internet, references in papers or books. Results : This review suggests that cognitive therapy is as effective as antidepressant medication in severe depressive disorders. And cognitive therapy can be an effective alternative to antidepressant medication. Patients benefited significantly more from combined cognitive therapy and antidepressant treatment than from either treatment alone. Most importantly, the addition of cognitive therapy to usual treatment appears to protect against future relapse in individuals known to be at high risk of repeated episodes of depression. In addition, subjects who received cognitive therapy showed significantly greater improvements in chronic depression than receiving antidepressant medication. Pooled data suggests that there is a significant relationship between the therapist's level of training or experience, the type of therapy used and patient outcome. Recent functional imaging studies examining brain changes following cognitive therapy report a variety of regional effects, but there is no consistent pattern across the few published studies. Conclusion : Cognitive therapy has proved beneficial in treating depressive patients. Despite empirical data supporting its efficacy, there are still problems in gaining access to cognitive therapy in clinical practice.

• Journal of Oriental Neuropsychiatry
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• v.24 no.1
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• pp.63-74
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• 2013

Objectives : The purpose of this study is to examine the effects of 3 day Forests healing programs for cognitive improvement, which consists of helpful contents of Korean medicine. Methods : This study examined the effects of forests healing for mild cognitive impairment patients, who visited a Korean medicine hospital neuropsychiatry clinic for outpatients. The Forests healing programs for cognitive improvement was run with 24 participants, in which 9 of them quit in the middle of the program, so excluded in data analysis. The Forests healing programs for cognitive improvement was consisted of 3 day helpful Korean medicine contents. The primary outcome measurement was a Computerized Neurocognitive Test (CNT), which measured the cognitive functions with computer programs. Results : The results of this study showed that CNT scores were not significantly changed after 3 day forests healing. General psychological states, including depression, anxiety, and anger, were also checked. Among them, depressive mood significantly improved. Quality of life (QOL) was also enhanced after 3 day program. These results indicate that the 3 day Forests healing programs for cognitive improvement was effective for depressive mood and QOL of mild cognitive impairment patients, but not enough for cognitive functions directly. Conclusions : The 3 day Forests healing programs for cognitive improvement were shown to be an effective intervention in improving some aspects of mild cognitive impairment patients, including depressive mood, and QOL. We suggest that repeated participation of this program can enhance cognitive function of mild cognitive impairment patients.

• Research in Community and Public Health Nursing
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• v.26 no.1
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• pp.1-10
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• 2015

Purpose: This study was conducted to investigate changes in cognitive functions, depression and life-satisfaction for elderly participants with mild cognitive impairments participating in an individual cognitive improvement program. Methods: A quasi-experimental with non-equivalent control group pretest-posttest design was implemented. The participants were senior citizens over 65 years of age who had been clinically diagnosed with mild cognitive impairments in G City and J Province (experimental group: 29, control group: 27). The experimental group participated in the individual cognitive improvement program based on Korean traditional tales and games for nine weeks. Results: After the intervention, only the participants in the experimental group reported significant improvement in K-MMSE (t=-2.5, p=.016), MoCA-K (t=-2.6, p=.008), depression (t=3.51, p=.001), and life satisfaction (t=-2.75, p=.008) when compared to those in the control group. Conclusion: These results indicated that the individual cognitive improvement program was effective in improving cognitive functions, depression, and life-satisfaction among the elderly with mild cognitive impairments. Therefore, the application of this individual cognitive improvement program developed in this study by visiting nurses may strengthen the cognitive functions of seniors with mild cognitive impairments.