• 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.

• The Journal of the Convergence on Culture Technology
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• v.10 no.1
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• pp.1-9
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• 2024

The purpose of this study was to identify the degree of academic stress, subjective happiness, and cognitive flexibility of nursing students, and to identify the mediating effect of cognitive flexibility between learning stress and subjective happiness. The subject of the study was 186 nursing students from a university in J City. The data collection period was from October 4 to October 23, 2023, and the data were analyzed using SPSS 23.0. The results of the study showed a significant correlation between academic stress, cognitive flexibility, and subjective happiness among nursing students, and it was found that cognitive flexibility partially mediated the relationship between academic stress and subjective happiness. Therefore, in order to improve the subjective well-being of nursing students, it is necessary to develop and apply programs that can reduce academic stress and increase cognitive flexibility.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2016.11a
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• pp.100-102
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• 2016

본 논문에서는 기존의 인지 영상 부호화에 사용되던 Just Noticeable Distortion(JND) 보다 더 압축에 적합한 모델인 Just Noticeable Quantization Distortion(JNQD) 모델을 제시하고, 이를 사용한 인지적 영상 압축 방법을 제안한다. 제안하는 인지적 영상 압축 방식은 영상 코덱 내부의 Rate-Distortion Optimization(RDO)을 수정하지 않고 입력되는 영상의 불필요한 정보들을 미리 제거하는 전처리 과정으로서, JNQD 모델을 사용하여 보다 간단하면서 압축 효율을 크게 증가 시킬 수 있다. 기존 영상 압축의 전처리 방법들은 부호화기의 양자화 값을 전처리 과정에서 고려하지 못하여 부정확한 인지 중복성 제거 결과를 초래하였으나, 제안하는 방법은 영상의 특성뿐만 아니라 양자화 크기 값을 고려하여 적응적으로 인지 왜곡이 발생하지 않는 주관적 인지 중복성 제거를 전처리 과정에서 수행할 수 있다. 거의 유사한 주관적 품질 수준을 유지하면서 HEVC 참조 소프트웨어 대비 약 15%의 압축효율 향상을 보인다.

• Korean Journal of Environment and Ecology
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• v.20 no.3
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• pp.319-330
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• 2006

It is imperative that pictograms as pictorial information be empirically tested in order to establish whether the users do indeed associate the appropriate referent in an actual usage situation. The experiment employing the Multiple Index Approach was conducted in a class room with 64 subjects to evaluate tourism and recreation related pictograms. Performance data(hit rate, false alarm and missing value) of 25 pictograms were collected and the average hit rate as a prime index of pictogram associativeness was 65.82%. The matrix analysis showed 14 pictograms were high in subjective certainty and subjective suitability. The other 11, which were low in both criteria may require prior learning or improvement of the pictogram designs to represent their meanings more distinctively.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.9
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• pp.358-372
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• 2020

This study examined the effect of cognitive reserve on the cognitive function in adults. In addition, this study investigated the direct and indirect effects of factors, such as subjective memory decline, depression, and quality of life on the cognitive function. The participants consisted of 253 adults who were 40 to 80 years of age. The assessment tools included the cognitive function scale, depression scale, quality of life scale, subjective memory decline, and cognitive reserve scale. The data results were analyzed using SPSS 25.0, and PROCESS macro for SPSS Version 3.3 and bootstrapping were used. The results of multiple mediating of the cognitive reserve and cognitive function in adults did not have a mediating effect in depression and subjective memory decline, and the quality of life showed a complete mediating effect in the relationship between the cognitive reserve and subjective cognitive function. Based on the results of this study, adults must accumulate cognitive reserve continuously through various activities and continuous training so that the cognitive function can lead to a positive direction. Nevertheless, more studies on cognitive reserve and cognitive function in healthy adults are needed.

• Journal of Digital Convergence
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• v.17 no.2
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• pp.283-292
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• 2019

The loss of semantic knowledge and impairments in semantic associations by semantic category is gaining increasing attention, as indicators of early-stage cognitive decline. As such, we assigned semantic association task (SAT) to normal elderly (NE) and those with subjective memory impairment (SMI) or mild cognitive impairment (MCI) to examine their performance by semantic subcategories and the differences in error patterns. We found a significant difference in the number of correct response and reaction time under the SAT categories among the three groups, with the highest performance observed in 'function' and the lowest performance in 'superordinate' and 'part/whole'. Moreover, the error frequency was the lowest in NE, followed by those with SMI and MCI, with the latter two groups showing a significant increase in no-response. Our findings demonstrate the varying extent and process of impairments in the semantic network by category over different stages of cognitive decline. Thus, we proposed SAT performance as an indicator to detect and follow-up on cognitive decline in elderly with cognitive disorder.

• Journal of the Korea Society of Computer and Information
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• v.27 no.7
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• pp.125-135
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• 2022

In this study, using KLoSA data, it was verified whether subjective expectations and depression had a multi-mediated effect on life satisfaction of the elderly with dementia and mild cognitive impairment. As a result of the analysis, first, it was analyzed that the higher the IADL of the elderly with dementia and mild cognitive impairment, the lower the subjective expectation, the higher the depression, and the lower the life satisfaction. Second, it was analyzed that as the subjective expectations of the elderly with dementia and mild cognitive impairment increased, depression decreased and life satisfaction increased. Third, it was analyzed that IADL in the elderly with dementia and mild cognitive impairment not only directly affects life satisfaction, but also indirectly affects life satisfaction through subjective expectations and depression, so it has a multi-mediated effect. Therefore, it is necessary to expand subjective expectations by expanding service providers that can support daily life restrictions for the elderly with dementia and mild cognitive impairment, providing regular programs by experts to reduce depression, and establishing new national pension benefits for dependents.

• 한국노년학
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• v.38 no.4
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• pp.811-835
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• 2018

Social relations and cognitive function in old age are closely related to each other, and social relation is classified into structural characteristics and qualitative characteristics reflecting cognitive and emotional evaluation. The concept of social isolation is the focus of attention in relation to the social relations of old age. Social isolation has a multidimensional theoretical structure that is divided into objective dimension such as social network, type of furniture, social participation, and subjective dimension such as lack of perceived social support and loneliness. There is also a close relationship between cognitive function and interpersonal conflict in old age. In this study, we examined the effect of subjective social isolation, which shows the structural characteristics of social relations, and subjective social isolation and interpersonal conflict on the dementia occurrence by age group in the elderly. The data were analyzed by applying a random effect panel logit model using 1,740 panel data from the first year to the third year of KSHAP. The results of the analysis are summarized as follows. First, the cognitive impairment increased sharply with age. Objective and subjective social isolation were both U-shaped distribution with an inflection point of 80 years old. Second, the main effect on the probability of cognitive impairment was statistically significant with objective and subjective social isolation, but the type of interpersonal conflict did not appear to be significant. Third, the results of two-way interaction effect analysis on the probability of cognitive impairment are as follows. The relationship between subjective social isolation and the probability of occurrence of cognitive impairment was significantly different according to the level of conflict with spouse. In addition, the higher the subjective social isolation, the higher the probability of cognitive impairment in the elderly(over 85) than in the young-old(65~74). In addition, as the level of conflict with spouses increases, the probability of cognitive impairment of the oldest-old(aged 85 or older) is drastically lower than that of the young-old(aged 65~74). Based on the results of this study, policy and practical implications for reducing the cognitive impairment of the elderly age group were suggested, and limitations of the study and suggestions for future research were discussed.

• The Journal of the Korea Contents Association
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• v.20 no.7
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• pp.491-502
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• 2020

This study was aimed to verify moderated mediation effect between cognitive-flexibility and subjective economic status in the process that aging anxiety have an effect on psychological well-being. For this, online survey was conducted to 317(M:159, F:158) adults who ranged from 40 to 64 years old. Survey was conducted from 2017.9.3. to 9.28. Correlation analysis, regression analysis, and significant test was done through SPSS 21.0 and SPSS Macro. First, the analysis showed that meaningful correlation was found among aging anxiety, cognitive flexibility, subjective economic status and psychological well-being. Secondly, cognitive flexibility was found to have meaningful partial mediation effect(β = .530, p < .001) in the relationship between aging anxiety and psychological well-being. Thirdly, subjective economic status was found to have a meaningful moderation effect(β = .080, 𝜟R²=.006, p <.05) in the relationship between cognitive flexibility and psychological well-being. Fourthly, verification result by SPSS Macro showed that, mediation effect of cognitive flexibility and subjective economic status was existent in the relationship of aging anxiety and psychological well-being. Lastly, implications and limitations of this study and suggestions for future studies were discussed.

• Journal of Korea Society of Industrial Information Systems
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• v.16 no.4
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• pp.139-149
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• 2011

Smartphone is a new information technology that converges PDA into a mobile phone. Based on the Technology Acceptance Model, this study examines factors influencing the intention to use smartphone. Independent variables of this research are composed of the subjective norm, innovativeness, perceived usefulness, perceived ease of use, perceived enjoyment, cost relevance. Questionnaires are collected from 289 students who are using a smartphone. The results are following: first, the subjective norm, innovativeness, perceived usefulness, the perceived enjoyment, and cost relevance have positive effect on the intention to use smartphone, but the perceived ease of use has not. Second, the perceived enjoyment is found to be the strongest predictor of the intention to use.