• ETRI Journal
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• 제31권3호
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• pp.263-270
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• 2009

This paper investigates linear soft combination schemes for cooperative spectrum sensing in cognitive radio networks. We propose two weight-setting strategies under different basic optimality criteria to improve the overall sensing performance in the network. The corresponding optimal weights are derived, which are determined by the noise power levels and the received primary user signal energies of multiple cooperative secondary users in the network. However, to obtain the instantaneous measurement of these noise power levels and primary user signal energies with high accuracy is extremely challenging. It can even be infeasible in practical implementations under a low signal-to-noise ratio regime. We therefore propose reference data matrices to scavenge the indispensable information of primary user signal energies and noise power levels for setting the proposed combining weights adaptively by keeping records of the most recent spectrum observations. Analyses and simulation results demonstrate that the proposed linear soft combination schemes outperform the conventional maximal ratio combination and equal gain combination schemes and yield significant performance improvements in spectrum sensing.

• 한국정보시스템학회지:정보시스템연구
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• 제23권3호
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• pp.73-97
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• 2014

Internet has begun various transformation and innovation in terms of society, culture and industry. Today, Social Network Service(SNS) is an exceedingly popular and useful tool for making human relationships. Previous studies related to SNS, which based on Technology Acceptance Model(TAM), were focused on user acceptance of new technology. However, they had the limitations to focus on technology acceptance, without the consideration of the cognitive factors in using SNS. This study examined how the main factors of intention to use of SNS continuously affect perceived usefulness and ease of use through familiarity, self-expression, hedonic shopping value, utilitarian shopping value and personal relationship. The results of hypothesis testing showed that familiarity, self-expression, hedonic shopping value and personal relationship have some positive impacts on the perceived usefulness and ease of use. The practical contribution of this study is to suggest useful decision alternatives concerned to marketing strategies for acquiring and retaining long-term customers related to SNS business.

• International journal of advanced smart convergence
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• 제12권2호
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• pp.127-134
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• 2023

Existing studies on this topic have focused on the effect of online content quality on consumer attitudes and behavior, with very few illustrating the effect of influencer image on consumer attitudes and behavior. The purpose of this study intents to reveal how influencer image affect consumer behavior. We have developed an image transfer theory-based research model to reveal how influencers transfer their image to endorsed products to influence consumer behavior. The results show that influencer image positively affects satisfaction, which in turn affects the product's cognitive and affective images in the vlog. Moreover, it was found that a product's cognitive image and affective image influence consumer behavior intention. Furthermore, purchase experience exhibits significant differences in its path. Based on these results, the social media-related research theoretical implication will be offered, and managerial implications will be provided for foreign brand promotion strategies

• 한국심리학회지ㆍ건강
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• 제15권3호
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• pp.483-498
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• 2010

본 연구는 혐오정서 유발자극에 대한 선행사건초점 조절전략과 반응초점 조절전략이 얼굴표정 및 정서경험에 미치는 영향을 알아보고자 하였다. 연구는 여자 대학생 50명을 대상으로 실시되었고, 참여자들이 혐오정서 유발동영상을 시청할 때 서로 다른 정서조절전략(정서 표현, 표현 억제, 인지적 재평가, 표현 불일치)을 사용하도록 하여 얼굴표정과 정서경험을 측정하였다. 분석결과, 정서 표현집단에서 혐오표현단위의 빈도가 가장 높았고 표현 불일치, 인지적 재평가, 표현 억제집단의 순으로 빈도가 높게 나타났다. 그리고 실제 경험한 정서를 반영하는 얼굴 윗부분에서 인지적 재평가집단의 혐오관련표현단위의 빈도가 정서 표현집단과 표현 불일치집단보다 낮게 나타났다. 자기보고식 정서 상태 측정결과, 표현 불일치집단에서 가장 많이 긍정정서가 감소한 반면, 인지적 재평가집단에서는 긍정정서가 증가하는 경향을 보였다. 본 연구는 정서조절전략이 얼굴표정 및 정서경험에 미친 영향을 통해 인지적 재평가전략이 가장 기능적인 정서조절전략임을 확인하였다.

• 대한간호학회지
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• 제51권3호
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• pp.294-304
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• 2021

Purpose: This study aimed to investigate objectively measured physical activity (PA) in institutionalized older adults with mild cognitive impairment (MCI) and to elucidate the influence of autonomic nervous function, salivary cortisol, and PA on cognitive functions based on neurovisceral integration model. Methods: Overall cognitive function was evaluated using the mini-mental state examination (MMSE) and executive function was evaluated using semantic verbal fluency test and clock drawing test. Actigraph for PA, HRV and sAA for autonomous function, and the geriatric depression scale for depression were used. Saliva specimens were collected in the morning for sAA and cortisol. Results: Ninety-eight older adults from four regional geriatric hospitals participated in the study. They took 4,499 steps per day on average. They spent 753.93 minutes and 23.12 minutes on average in sedentary and moderate-to-vigorous activity, respectively. In the multiple regression analysis, lower salivary cortisol level (β = - .33, p = .041) and greater step counts (β = .37, p = .029) significantly improved MMSE score. Greater step count (β = .27, p = .016) also exerted a significant influence on verbal fluency, and greater sAA (β= .35, p = .026) was significantly associated with a better clock drawing test result. Conclusion: Salivary cortisol, sAA and physical activity were significantly associated with cognitive functions. To prevent older adults from developing dementia, strategies are needed to increase their overall PA amount by decreasing sedentary time and to decrease salivary cortisol for cognitive function, and to maintain their sympathetic nervous activity for executive function.

• 한국도서관정보학회지
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• 제39권3호
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• pp.139-159
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• 2008

독서교육에 관한 최근의 연구에 의하면 독립적인 기능 중심의 교육보다는 독서전략을 중심으로 지도해야 한다는 주장이 폭넓게 수용되고 있다. 독서전략은 독자가 능숙하게 독서를 하는데 동원하거나 지도교사가 효과적인 독자가 될 수 있도록 지도하는 방법이나 의도적인 계획을 말한다. 그동안 학교도서관에서 제공하는 독서교육 프로그램은 독서촉진 혹은 행사에 치중해 왔다. 따라서 학교도서관에서 제공하는 독서교육은 독서촉진이나 행사보다는 독서전략 중심의 교육으로 전환할 필요가 있다. 이에 본 연구에서는 텍스트 종류, 텍스트의 구조, 독서의 과정, 인지전략 등 4개의 요소로 구분하여 독서교육에 필요한 독서전략을 범주화하였다.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제19권1호
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• pp.81-88
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• 2015

This study used a posttest control group design and to find out differences between students' self-regulated learning strategies in traditional and non-traditional classroom. To this end, 131 first year university students within the experimental and control groups took part in the study. While ICT-based approach was used as the main medium of instruction in the experimental group, in the control group the paper-based traditional method was used. A survey adapted from Davaanyam [Davaanyam, T. (2013). The structural relationships among Mongolian students' attitudes toward mathematics, motivational beliefs, self-regulated learning strategies, and mathematics achievement. Ph. D. Dissertation. Jeonju, Jeonbuk, Korea: Chonbuk National Unversity.] was used to gather the data. The results of the study indicated a significant difference between the control and experimental groups in regard with their self-regulated learning. That is to say, the experimental group taught through ICT tools acquired higher levels of self-regulation as compared with the control group instructed through the traditional teaching method.

• International Journal of Advanced Culture Technology
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• 제12권2호
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• pp.205-214
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• 2024

This paper delves into the application of Gestalt psychology principles in logo design. It analyzes how these principles refine design elements to bolster the efficiency and impact of visual communication. Drawing from Gestalt psychology perspectives, the theoretical foundations and application methods of logo design simplification strategies are discussed. Through the analysis of Gestalt psychology effects in various types and styles of logo designs, this study compares the applicability and differences of logo design simplification strategies under different cultural and social contexts. Furthermore, it evaluates their role and value in enhancing the innovativeness and communicative impact of logo designs. The findings suggest that strategies informed by Gestalt psychology significantly improve the organization rules within logo designs, such as the relationship between figure and ground, proximity, similarity, and continuity. Thereby they enhance perceptual clarity, cognitive load, and aesthetic satisfaction. Moreover, these strategies promote creative thinking and problem-solving abilities in logo design. The results indicate that simplified design methods not only enhance aesthetic appeal but also improve the adaptability and recognizability of logos across different media and environments. This approach aligns with the minimalist and flat design trends of today's information age, meeting the evolving needs and aesthetic preferences of consumers.

• 한국초등수학교육학회지
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• 제19권1호
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• pp.57-80
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• 2015

이 연구는 초등학교 수학 시험준비전략과 시험수행전략 검사를 개발하는 데 목적이 있다. 이를 위해 초등학생 9명을 대상으로 반구조화면접을 시행하여 시험준비전략 및 시험수행전략의 요인을 도출하고 요인별 문항을 개발한 다음, 초등교원 및 전문가의 내용타당도 검토를 거쳤다. 또한 G광역시 소재 13개 초등학교 6학년 학생 857명을 대상으로 변수중심 검사타당화를 시도하였다. 본 연구의 결과는 다음과 같다. 첫째, 수학 시험준비전략 및 시험수행전략 검사에서 각각 인지전략, 메타인지전략, 학습자원관리전략의 3요인이 도출되었다. 둘째, 탐색적 요인분석, 확인적 요인분석 및 신뢰도 분석을 사용하여 타당화한 결과, 3요인 23문항의 수학 시험준비전략 검사와 3요인 24문항의 수학 시험수행전략 검사가 구성되었다. 이 연구에서 개발한 검사를 이용하여 초등학생 수학 시험준비전략과 시험수행전략의 각 요인별 수준을 파악하고, 이를 바탕으로 각 요인별 전략을 향상시키기 위한 프로그램 개발이 가능할 것으로 본다.

• 대한불안의학회지
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• 제12권1호
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• pp.47-55
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• 2016

30% of patients with panic disorder (PD) show treatment-resistant and chronic waxing and waning course. Therefore, adequate treatment strategies for PD by evidence based pharmacotherapy and combined cognitive behavioral therapy (CBT) are recommended. Regarding how and why CBT for PD works, three hypotheses include the cognitive theory, anxiety control theory, and behavioral theory were discussed. The recent findings that the altered activation in frontal lobe is normalized after CBT, suggest a reduction of an altered top-down fear processing in the neural correlates of CBT in PD. In order to improve accessibility to CBT, brief CBT and internet based CBT for PD were suggested. Despite limitations of sample sizes and study design, most of studies suggest that brief CBT is more effective than control conditions, and even as equally effective as standard CBT. The evidences suggest that internet based CBT may not be significantly different from face-to-face CBT in reducing anxiety. Several advances within the field of third-wave CBT for PD have led to the development of new techniques based on mindfulness, such as mindfulness-based cognitive therapy and acceptance and commitment therapy. Based on Korean algorithm project for panic disorder, especially the psychological education and cognitive reconstruction components were recommended in CBT with PD.