• Korean Journal of Child Studies
• /
• v.16 no.1
• /
• pp.49-64
• /
• 1995

The purpose of this study was to investigate differences in social play, cognitive play, and social-cognitive play patterns as related to young children's field independence-dependence cognitive styles. Sixteen field independent and sixteen field dependent children were selected from a group of 79 young children with the use of Preschool Embedded Figures Test(PEFT). Their social play, cognitive play, and social-cognitive play patterns were observed. The data collected for this study were analyzed by using SPSS/$PC^+$; frequency, percentage and ${\chi}^2$ test. The results of this study were that (1) difference of social play patterns as related to young children's field independence-dependence cognitive styles was not found, (2) differences were found in cognitive play patterns as related to young children's field independence-dependence cognitive styles, and (3) differences were found in social-cognitive play pattern as related to young children's field independence-dependence cognitive styles.

• ETRI Journal
• /
• v.42 no.6
• /
• pp.976-986
• /
• 2020

Internet of Things (IoT) is considered the future network to support wireless communications. To realize an IoT network, sufficient spectrum should be allocated for the rapidly increasing IoT devices. Through cognitive radio, unlicensed IoT devices exploit cooperative spectrum sensing (CSS) to opportunistically access a licensed spectrum without causing harmful interference to licensed primary users (PUs), thereby effectively improving the spectrum utilization. However, an open access cognitive IoT allows abnormal IoT devices to undermine the CSS process. Herein, we first establish a hard-combining attack model according to the malicious behavior of falsifying sensing data. Subsequently, we propose a weighted sequential hypothesis test (WSHT) to increase the PU detection accuracy and decrease the sampling number, which comprises the data transmission status-trust evaluation mechanism, sensing data availability, and sequential hypothesis test. Finally, simulation results show that when various attacks are encountered, the requirements of the WSHT are less than those of the conventional WSHT for a better detection performance.

• The Journal of Korean Society for School & Community Health Education
• /
• v.16 no.2
• /
• pp.59-67
• /
• 2015

Objectives: To study about cognitive degree of drinking evil of the department of nursing science students in a partial area. Methods: The data were collected by questionnaire from the 249 nursing science students. The analysis of the data was used by SAS program(ver. 9.2). Technical statistics analysis was used in general characteristics and drinking related characteristics and cognition of objects. T-test was used in cognitive degree of social evil by drinking as characteristics of objects. Logistic regression was used in factors affecting on cognitive degree of social evil by drinking. Results: Cognitive degree of social evil by drinking was low as more drinking related outlay expenses and was high as more moderation in drinking and publicity experience. Conclusions: University and the government authorities must consider the serious and importance of the problem and enforce moderation in drinking and publicity for nursing science students and develop education program and prepare the publicity material.

• The Journal of Industrial Distribution & Business
• /
• v.11 no.7
• /
• pp.41-49
• /
• 2020

Purpose: The purpose of this study is to recognize the role and necessity of public data visualization through prior research, investigation, and data verification processes. In addition, this study intends to check what factors should be considered in order to visualize data on the mobile web. Through this process, by identifying the cognitive load affecting information visualization by type, as a result, I would like to propose an effective information visualization method to effectively deliver public data related to government policies. Research design, data and methodology: In this study, we analyzed the case of information visualization according to infographics, which has been widely used in the public field among various visualization methods. For this study, a questionnaire survey was conducted for young people in their 20s and 30s with the highest mobile usage rate. Results: Based on the results, IPA (Importance Performance Analysis) was performed to conduct cognitive load test tools for information visualization of public data and confirmed the implications for each type of infographics. Conclusions: As a result of research, in order to efficiently deliver public data on the mobile web, first, it is necessary to construct a visual screen that can be easily identified through clear data. Appropriate graphic elements can be used according to the type to make it easier for users to acquire and understand information. Second, it is necessary to provide useful content in visualizing information. Third, in order to efficiently transmit information and increase understanding of data, it is necessary to visualize information that can induce interest in data and form metaphors. Fourth, it is necessary to visualize information to reduce cognitive load in terms of physical and mental aspects in order to accommodate users' comfortable information. Fifth, in order to effectively deliver public data, it is necessary to compose contents and information that are easy for users to understand. This study examines effective information visualization methods to increase the communication effect of public data in response to changes in the data-based intelligent information society and suggests implications for each type considering cognitive loads to help future public institutions to communicate and accept information.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.36 no.3A
• /
• pp.287-295
• /
• 2011

Cognitive radio (CR) features opportunistic access to spectrum when licensed users (LU) are not operating. To avoid interference to LU, cognitive users (CU) need to perform spectrum sensing. Because of local shadowing, fading, or limited sensing capability, it is suggested that multiple CUs cooperate to detect LU. In cooperative spectrum sensing, CUs should exchange their sensing data with minimum bandwidth and delay. In this paper, we introduce a novel method to efficiently report sensing data to the central node in an infrastructured OFDM-based CR network. All CUs simultaneously report their sensing data over unique and orthogonal signals on locally available subcarriers. By detecting the signals, the central node can determine subcarrier availability for each CU. Implementation challenges are identified and then their solutions are suggested. The proposed method is evaluated through simulation on a realistic channel model. The results show that the proposed method is feasible and efficient.

• Journal of Korean Public Health Nursing
• /
• v.31 no.2
• /
• pp.209-219
• /
• 2017

Purpose: The purpose of this study was to identify the gender differences in the cognitive function and nutritional status among elderly people living in the community. Methods: This study used data from the 2014 National Survey on the Elderly and focused on 10,054 respondents who answered that they did not have dementia. The Korean version of Mini-Mental State Examination for Dementia Screening and the Nutrition Screening Initiative were used. IBM SPSS Statistics 23.0 was used to conduct statistical analyses. Results: The cognitive function score was 25.30 for men, which was higher than for women. The percentage of subjects who showed cognitive decline was 25.5% for males and 50.2% for females, which was statistically significant (p<.001). There were statistically significant differences in the nutritional status between males and females (p<.001). There was a statistically significant negative correlation between the cognitive function and nutritional status in both men and women (p<.001, p<.001). Conclusion: These results showed that the intervention to maintain cognitive functioning should be provided to elderly women with a low education level or high number of chronic diseases and medication, and an intervention to prevent the cognitive decline of the elderly should include nutritional management for health and function maintenance.

• Korean Journal of Adult Nursing
• /
• v.13 no.3
• /
• pp.451-462
• /
• 2001

This study was conducted to examine and compare the characteristics in the cognitive functions of peritoneal dialysis, hemodialysis and normal kidney function groups as basic data for effectively educating dialysis patients. The data were collected from May 10 to October 30. 2000, collected from each of 20 patients with peritoneal dialysis, hemodialysis and normal Kidney function and who registered for the dialysis room at a general hospital affiliated to a university in Seoul and sampled by age and educational level through personal interviews with the researchers of this study. As a measuring tool, MMSE developed by Folstein et al.(1975) to measure cognitive function disorder was used, slightly revised for hemodialysis patients. Collected data were processed into frequency, percentage, mean, and standard deviation by the use of SAS. The results of this study are as follows : 1. With a maximum of 30 points for cognitive function, the mean of the peritoneal dialysis patients was $27.06{\pm}2.06$, while that of the hemodialysis patients was $27.25{\pm}2.76$; that of the normal Kidney function patients was $27.85{\pm}2.00$, indicating no significant difference among those three groups. 2. As for the subjects who scored 23 points, the turning point of confirming the cognitive disorder, the percentage was 5% in the case of the peritoneal dialysis, 10% in the case of the hemodialysis and 5% in the case of the normal Kidney function group. 3. Differences between the peritoneal dialysis and hemodialysis patients by gender, occupation, spouse, diabetes, hypertension, the period of dialysis, number of hospitalizations, and the use of erythropoietin were not significant in the scoring of cognitive function. 4. There was no significant correlation between the level of Hb, Hct, albumin, aluminium, PTH, BUN, Cr, dialysis adequacy and the cognitive function. Considering such results, it is clear that there is no significant difference in the cognitive functions of the sampled subjects. Therefore, the nurse in the dialysis room should continually carry out assessment and intervention against elements degrading the effect of patients' education to improve self- care.

• Journal of Oriental Neuropsychiatry
• /
• v.30 no.3
• /
• pp.185-198
• /
• 2019

Objectives: The purpose of this study was to identify the effectiveness of Korean medicine treatment in mild cognitive impairment (MCI) among a group of community dwelling elderly. Methods: Two-hundred and twenty-nine elderly living in a community and diagnosed with MCI were recruited. Participants were evaluated with various instruments such as the Korean version of Mini-Mental State Examination for Dementia Screening (MMSE-DS) and the Korean version of Montreal Cognitive Assessment (MoCA-K). Korean medicine treatment consisted of herbal medicine, acupuncture, and pharmacoacupuncture. The change in cognitive ability was assessed by using the MMSE-DS and the MoCA-K. Data were analyzed by SPSS/WIN 22.0 using the paired t-test, and the ANOVA. Results: The MMSE-DS and the MoCA-K score generally increased after six months of Korean medicine treatment and the differences in both instruments were statistically significant. Additionally, some consecutive participants maintained long-term cognitive improvement. When analyzed specifically by herbal medicine group based on syndrome differentiation and pharmacoacupuncture group, most showed improvement in the MMSE-DS and the MoCA-K but not all data were statistically significant. The satisfaction score was mostly high and most participants were willing to re-participate in the program. Conclusions: Korean medicine treatment may contribute to the improvement and prevention of cognitive decline in the elderly. However, further systematic research based on large scale sample data and standardized protocols is needed to uplift the welfare and mental health of the elderly.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.8 no.3
• /
• pp.911-923
• /
• 2014

Ad hoc cognitive radio wireless sensor networks allow secondary wireless sensor nodes to recognize spectrum opportunities and transmit data. Most existing protocols proposed for ad hoc cognitive radio wireless sensor networks require a dedicated common control channel. Allocating one channel just for control packet exchange is a waste of resources for channel-constrained networks. There are very few protocols that do not rely on a common control channel and that exchange channel-negotiation control packets during a pre-allocated time on the data channels. This, however, can require a substantial amount of time to access the channel when an incumbent is present on the channel, where the nodes are intended to negotiate for the data channel. This study examined channel access delay on cognitive radio wireless sensor networks that have no dedicated common control channel.

• Journal of Korean Public Health Nursing
• /
• v.27 no.3
• /
• pp.450-465
• /
• 2013

Purpose: The purpose of this study was to identify cognitive impairment and risk factors among elderly persons aged 60 or more in Korea using raw data from the 2008 Elderly Survey: Basic Analysis Report of Actual Living Condition of the Elderly and Welfare Need Survey in Korea. Methods: This study was conducted using raw data obtained from 13,335 subjects representing elderly persons aged 60 or more in Korea. Data were analyzed using SPSS 19.0 software. Results: The rate of cognitive impairment was found to be 22.0%. Logistic regression analysis became more prevalent with increased aged. In addition elderly subjects with the following factors showed increased cognitive impairment: mails; underweight; slept well for 3 to 4 days per week at most; lack of high intensity physical activity; Eub/Myoun area; did not live alone; did not graduate from high school; un-employed; lack of active social participation, and not computer/Internet savvy. Conclusion: This study identified cognitive impairment and risk factors among elderly persons aged 60 or more in Korea using samples representing elderly persons aged 60 or more throughout the country.