• Korean Institute of Interior Design Journal
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• v.27 no.3
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• pp.3-13
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• 2018

Although the number of dual low-income families continues to increase, working mothers are suffering from difficulties from housework and child rearing due to the economic difficulties and poor residential environment. By understanding the needs about community space and child-care support services, this study will look into planning cooperative child-care environments for dual low-income families with infants and children. Through purposive sampling this research targeted 151 dual income families with an average monthly income level of 1-3 in Seoul. The collected data was analyzed by frequency analysis, descriptive statistics, and independent sample t-test using SPSS. The research results are as follows: According to the review, respondents responded positively to cooperative child-care. Out of the 20 general community spaces, the need for an indoor playground, recreation room, day nursery, separate garbage and reading room ranked high. Overall, 21 child-care community spaces and 11 child-care support services were generally rated highly.

• Journal of Korea Game Society
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• v.15 no.5
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• pp.153-162
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• 2015

This study explores the social sides of games by investigating the relationship between cooperative games and psychological factors determining social relationships (i.e., self-disclosure, intimacy) and how such psycosocial factors influence offline social participations. Utilizing both online and offline surveys, the results indicated that the amount of time spending on cooperative games have a positive impact on self-disclosure and intimacy. The results also showed that users' self-disclosure and intimacy influence offline social participation.

• Smart Structures and Systems
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• v.26 no.1
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• pp.11-21
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• 2020

The hinge joint is the key to the overall cooperative working performance of the assembled beam bridge, and it is also the weakest part during the service period. This paper proposes a method for monitoring and evaluating the lateral cooperative working performance of fabricated beam bridges based on dynamic strain correlation coefficient indicator. This method is suitable for monitoring and evaluation of hinge joints status between prefabricated girders and overall cooperative working performance of bridge, without interruption of traffic and easy implementation. The remote cloud monitoring and diagnosis system was designed and implemented on a real assembled beam bridge. The algorithms of data preprocessing, online indicator extraction and status diagnosis were given, and the corresponding software platform and scientific computing environment for cloud operation were developed. Through the analysis of real bridge monitoring data, the effectiveness and accuracy of the method are proved and it can be used in the health monitoring system of such bridges.

• Journal of Engineering Education Research
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• v.11 no.4
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• pp.109-114
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• 2008

The purpose of this study was to investigate the relationship between self-leadership and teamwork in cooperative learning of capstone design. The results showed significant relationship between self-leadership and teamwork, with high self-leadership group obtaining higher teamwork scores than low self-leadership group. The results of stepwise analysis suggested that cognitive-oriented strategies, including cooperating more pleasant and enjoyable features into a given task, focusing on the task's inherently rewarding aspects, and focusing thoughts on positive aspects of the task, were the best predictors of overall teamwork. Therefore, it would be useful to provide the engineering students with the opportunities to develop their cognitive-oriented self-leadership strategies.

• Proceedings of the IEEK Conference
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• 2005.11a
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• pp.15-18
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• 2005

Cooperative diversity is a transmission technique, in which multiple terminals pool their resources to form a virtual antenna array that realizes spatial diversity gain in a distributed fashion. In this paper, we propose a new type of cooperative transmission protocol with a full rate and show that its BER performance is improved by 8dB over the existing protocol under the AF (amplify-and-forward) mode of relaying.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.1191-1194
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• 2006

디지털 기술의 발전으로 다양한 컨버전스 제품들이 출시되고 있으며 컨텐츠의 디지털화가 가속화됨에 따라 대용량의 멀티미디어 데이터를 편리하게 분산 저장 관리 및 공유할 수 있는 기술 개발이 요구되고 있다. 본 논문에서는 이러한 요구 사항을 반영한UPnP를 이용한 유비쿼터스 가상저장공간에 대해 설계 및 구현한다. UPnP를 이용한 유비쿼터스 가상저장공간은 유비쿼터스 기술을 기반으로 정보가전기기 내에 존재하는 저장장치를 UPnP를 이용하여 하나의 큰 가상저장공간을 구축하고, 가상저장공간 내에 멀티미디어 파일을 힌트정보와 함께 저장함으로써 대용량의 멀티미디어 파일을 보다 지능적으로 탐색할 수 있는 기법을 제공한다.

• ETRI Journal
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• v.34 no.1
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• pp.102-105
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• 2012

To serve the growing demand of the bidirectional information exchange, we propose a single relay selection (RS) scheme for physical-layer network coding (PNC) in a bidirectional cooperative network consisting of two sources and multiple relays. This RS scheme selects a single best relay by maximizing the bottleneck of the capacity region of both information flows in the bidirectional network. We show that the proposed RS rule minimizes the outage probability and that it can be used as a performance benchmark for any RS rules with PNC. We derive a closed-form exact expression of the outage probability for the proposed RS rule and show that it achieves full diversity gain. Finally, numerical results demonstrate the validity of our analysis.

• Journal of The Korean Association For Science Education
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• v.32 no.9
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• pp.1427-1442
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• 2012

This study tracked the changes of preservice biology teachers' pedagogical knowledge along with science teaching efficacy throughout sequentially developed science methods course I and II over two consecutive semesters. Two courses, science methods course I and II, aimed these preservice teachers to discuss the notion of science teaching with teaching and learning theories, to learn science instructional models, to design lessons utilizing science instructional models, and to eventually implement microteaching. The preservice teachers were mainly engaged in cooperative instructional planning activities through science methods course I, and engaged in cooperative microteaching activities through the science methods course II. This study revealed that preservice teachers successfully developed pedagogical knowledge and science teaching efficacy after two science methods courses. The science methods course I where cooperative instructional planning activities occurred helped the preservice teachers to improve pedagogical knowledge but not science teaching efficacy. Based on their pedagogical knowledge development, then, these preservice teachers increased science teaching efficacy belief after completion of the science methods course II.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.13 no.4
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• pp.1904-1921
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• 2019

In this paper, we investigate the problem of secure communications in multiple-input-multiple-output interference networks from the perspective of physical layer security. Specifically, the legitimate transmitter-receiver pairs are divided into different categories of active and inactive. To enhance the security performances of active pairs, inactive pairs serve as cooperative jammers and broadcast artificial noises to interfere with the eavesdropper. Besides, active pairs improve their own security by using joint transceivers. The encoding of active pairs and inactive pairs are designed by maximizing the difference of mean-squared errors between active pairs and the eavesdropper. In detail, the transmit precoder matrices of active pairs and inactive pairs are solved according to game theory and linear programming respectively. Experimental results show that the proposed algorithm has fast convergence speed, and the security performances in different scenarios are effectively improved.

• International Journal of Advanced Culture Technology
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• v.9 no.1
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• pp.168-176
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• 2021

This study developed and evaluated a learning model to improve collaborative problem-solving skills for nursing students taking physiology courses. This one-group pretest-posttest design used the jigsaw cooperative learning method on 30 nursing students from one local university. We analyzed the effect of a cooperative problem- solving learning model using SPSS 21.0 to compare changes in the students' collaborative self-efficacy, problem-solving abilities, and team-member exchange. As a result, the participants showed significant increases in collaborative self-efficacy, problem-solving ability, and team-member exchange after experiencing cooperative problem- solving learning model. Therefore, we will help nursing students improve their communication skills by enhancing their collaborative self-efficacy and help them solve problems effectively in conflict situations.