• 대한전자공학회논문지TC
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• 제44권5호
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• pp.33-39
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• 2007

본 논문은 cognitive radio (CR) 기능을 갖는 무선 멀티홉 릴레이 네트워크의 throughput 용량에 대한 연구 결과이다. 본 논문에서는 TDMA/FDMA에 기반한 프레임 구조를 갖는 릴레이가 기지국과 통신할 때 CR 기술을 이용하여 현재 사용되고 있지 않는 주파수 자원을 측정하여 동적으로 이용하는 시스템을 제안하고 이의 throughput 용량 모델을 제안 하였다. 특히, 본 논문에서는 Utilization factor를 이용하여 제안된 시스템을 위한 throughput 용량 모델을 제안하였다. 해석 모델링 결과 본 논문에서 제안한 CR 기반 멀티홉 릴레이 시스템은 throughput 용량을 매우 향상하는 결과를 보였다.

• Journal of Information Technology Applications and Management
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• 제28권3호
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• pp.109-125
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• 2021

For the government of president Moon's AI SW HRD policy, he proclaimed AI democracy that anyone can utilize artificial intelligence technology to spread AI education for the people of the country. Through cognitive map analysis, this study presents expected policy outcomes due to the input of policy factors to overcome crisis factors and utilize opportunity factors. According to the cognitive guidance analysis, first, the opportunity factor is recognized as accelerating the digital transformation to Covid 19 if AI SW HRD is well nurtured. Second, the crisis factor refers to the rapid paradigm shift caused by the intelligence information society, resulting in job losses in the manufacturing sector and deepening imbalance in manpower supply and demand, especially in the artificial intelligence sector. Third, the comprehensive cognitive map shows a circular process for creating an AI SW ecosystem in response to threats caused by untact caused by Corona and a circular process for securing AI talent in response to threats caused by deepening imbalance in manpower supply and demand in the AI sector. Fourth, in order to accelerate the digital circulation that has been accelerated by Corona, we found a circular process to succeed in the Korean version of digital new deal by strengthening national and corporate competitiveness through AI-utilized capacity and industrial and regional AI education. Finally, the AI utilization empowerment strengthening rotation process is the most dominant of the four mechanisms, and we also found a relatively controllable feedback loop to obtain policy outputs.

• 한국노년학
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• 제40권3호
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• pp.413-428
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• 2020

본 연구는 '2017년도 노인 실태조사'에 응답한 65세 이상 노인 8,942명을 대상으로 ICT를 활용한 자녀·손자녀 접촉빈도, 디지털 리터러시 등의 특성이 인지기능에 미치는 영향을 파악하기 위한 이차자료 분석 연구로, 다중 회귀분석을 활용하였다. 연구 결과 노인의 인지기능에 가장 큰 영향을 미치는 요인은 디지털 리터러시로 나타났다. 또한 ICT를 활용한 손자녀와의 접촉빈도는 디지털 리터러시 및 인지기능과 유의한 상관관계가 있으며 인지기능에 긍정적 영향을 주는 요인임이 새롭게 밝혀졌다. 이를 토대로 노인을 대상으로 한 정보화 교육 및 활용의 중요성과 이를 통한 세대 간 의사소통 활성화의 필요성에 대해 논의하였다.

• 대한토목학회논문집
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• 제30권3D호
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• pp.231-240
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• 2010

교차로 교통사고의 주요 원인은 인적요인에 의한 교통사고가 대부분 차지하고 있어 운전자들의 주행특성 및 교통상황에 따른 심리적 생리적 변화측정을 통해 영향 요인 규명이 필요하다. 이에 본 연구에서는 운전자들의 인적요인을 고려한 개별 교차로 안전성 평가를 위하여 최첨단 계측장비를 활용한 뇌파반응을 측정하고 설문조사를 통해 평상시와 주행 실험시 운전자들의 인지특성 조사를 실시하였다. 교차로 접근시 뇌파변화와 주행실험 인지평가조사 자료의 관계성을 규명하고, 주행실험의 인지평가요인과 생체적 반응 뇌파데이터를 고려한 개별 교차로 안전성 평가 모형을 구축하였다. 그 결과, 교차로의 물리적 특성에 따라 생체반응 뇌파가 다르게 나타나고 인지평가 또한 차이가 있어 주행시 생체반응(뇌파)과정을 통해 인지평가를 하고 있음을 확인할 수 있었다.

• 한국인공지능학회지
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• 제12권1호
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• pp.7-16
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• 2024

This study aims to explore driving factors of Artificial Intelligence application for city marketing strategy with perspectives of millennials and generation Z. This study proposed the following research questions: i) how perceived place branding factor, public service factor, affective factor, immersive experience factor, cognitive factor, cost benefit factor, social networking factor, and promotional value factor affect attitude toward AI application for city marketing; and ii) how attitude affect satisfaction and prospect toward AI application for city marketing? This study conducted an online survey with the assistance of a well-known research agency and applied factor and regression analysis to test hypotheses. The results found that effects of place branding, cognitive, social networking, and promotional value affect attitude significantly in the case of millennials, while effects of public service, affective, cost benefit, social networking, and promotional value affect attitude significantly in the case of generation Z. The results found that effects of attitude on satisfaction and prospect of AI showed significance. The results provide implications and different aspects for AI application of city marketing strategy with perspectives by generations, while millennials and generation Z perceived effects of promotional value as the most significant factor for AI application of city marketing strategy.

• 대한간호학회지
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• 제46권1호
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• pp.1-18
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• 2016

Purpose: This study was conducted to synthesis the results of research on relationships of cognitive impairment with multi-dimensional correlates of rheumatic disease through a systematic literature review and meta-analysis. Methods: For the study purpose, 23 studies were selected through a systematic process of searching the literature. Results: The study results showed that among general characteristics, age and education were the variables having a significant relationship with cognitive impairment. Among health risk factors, obesity appeared to have a significant positive relationship with cognitive impairment. For past history, diabetes and hypertension were shown to have a significant positive relationship with cognitive impairment. It was noted also that aPL, one of the physiological factor, had significant association with cognitive impairment. None of the medication related factors had a significant relationship with cognitive impairment. Results showed that among disease related factors, disease activity had the highest relationship with cognitive impairment. Depression, among psychological factors, was the only variable having a significant relationship with cognitive impairment. Conclusion: The findings indicate that the variables strongly impacting on cognitive impairment in rheumatic disease are depression and disease activity.

• Journal of Information Processing Systems
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• 제13권2호
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• pp.417-427
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• 2017

Power allocation is an important factor for cognitive radio networks to achieve higher communication capacity and faster equilibrium. This paper considers power allocation problem to each cognitive user to maximize capacity of the cognitive systems subject to the constraints on the total power of each cognitive user and the interference levels of the primary user. Since this power control problem can be formulated as a mixed-integer nonlinear programming (NP) equivalent to variational inequality (VI) problem in convex polyhedron which can be transformed into complementary problem (CP), we utilize modified projection method to solve this CP problem instead of finding NP solution and give a power control allocation algorithm with a subcarrier allocation scheme. Simulation results show that the proposed algorithm performs well and effectively reduces the system power consumption with almost maximum capacity while achieve Nash equilibrium.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제5권1호
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• pp.59-75
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• 2001

This paper reports an investigation of problem solving activities of students at university level students. The study focused on the cognitive-metacognitive and affective activities appeared in problem solving process. The cognitive-metacognitive framework was used to analyzed and categorize the written response and free response of interviews probing the students\\` cognitive-metacognitive activities. Affective factors were assessed by administering the problem solving survey (Carlson, The emergence of students\\` problem solving behavior, 1999). This study provide an insight for the design of problem solving instruction by identifying cognitive, metacognitive and affective characteristics of the students\\` problem solving behaviors. The results report that the metacognitive factor were significantly related to problem solving performance interacting with both cognitive and affective factors.

• 지역사회간호학회지
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• 제12권3호
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• pp.557-569
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• 2001

The purpose of the study was to test the Pender's New Health Promotion Model in order to explain and predict female workers' health promotion behavior at manufacturing plants by using latent variable structural equation model. The data were collected from 280 female workers at 8 electronic factories located at Seoul. Kyunggi. and Incheon using a structured questionnaire through interview and self-report. LISREL was used to test the model. The results are as follows: 8 out of 15 paths of the modified one from the hypothetical model of Health Promotion were statistically significant and the total variance was 40%. The relationship between the previous health behavior and the cognitive emotional factor, and the interpersonal factor. and the situational factor each. and the relationship between perceived health status and interpersonal factor, and health promotion behavior each among gamma paths were unidirectional. On the beta paths. the relationship between the interpersonal factor and the cognitive emotional factor was bi-directional: the relationships amongst the interpersonal factor and the commitment to action, and the health promotion behavior were unidirectional. But the commitment to action was not a significant mediating factor to the health promotion behavior. Pender's New Model is considered good to explain and predict the female workers' health promotion behavior. The interpersonal factor should be considered in occupational nursing practice. But the concepts of situation and commitment to action should be further validated and measured.

• 한국과학교육학회지
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• 제22권1호
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• pp.132-140
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• 2002

이 연구는 고등학교 학생들의 인지 양식과 인지 수준에 따른 화학 문제 해결 정도를 알아보는데 그 목적을 두었다. 고등학교 2학년 322명을 대상으로 인지 양식 검사, 인지 수준 검사, 그리고 화학 문제 해결검사를 실시하였다. 이 때 화학 문제 해결 검사는 오도 요소(불필요한 정보)가 없는 문항 5개 와 오도 요소가 있는 문항 5개로 구성되었다. 연구 결과에 의하면, 오도 요소가 없는 문항과 있는 문항의 경우 모두 인지 양식이 장독립적일수록, 인지 수준이 형식적 조작기일수록 성취도가 높았다. 학생의 두 가지 인지변인이 화학 문제 성취도를 설명하는 정도를 비교하였을 때, 오도 요소가 없는 문제에서는 인지 수준이. 오도 요소가 있는 문제에서는 인지 양식이 상대적으로 더 큰 설명력을 가지고 있었다. 오도 요소가 있는 5개 문항 중 2문항에서. 오도 요소에 이끌려 문제 해결에 실패한 학생의 인지 양식 검사 점수가 성공한 학생의 점수보다 통계적으로 유의미하게 낮았다.