• KSII Transactions on Internet and Information Systems (TIIS)
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• v.9 no.1
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• pp.1-19
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• 2015

With the recent popularity of smart terminals, the demand for high-data-rate transmission is growing rapidly, which brings a new challenge for the traditional cellular networks. Both device-to-device (D2D) communication and small cells are effective to improve the transmission efficiency of local communication. In this paper, we apply D2D communication into a small cell network system (SNets) and study about the optimization problem of resource allocation for D2D communication. The optimization problem includes system scheduling and resource allocation, which is exponentially complex and the optimal solution is infeasible to achieve. Therefore, in this paper, the optimization problem is decomposed into several smaller problems and a hierarchical scheme is proposed to obtain the solution. The proposed hierarchical scheme consists of three steps: D2D communication groups formation, the estimation of sub-channels needed by each D2D communication group and specific resource allocation. From numerical simulation results, we find that the proposed resource allocation scheme is effective in improving the spectral efficiency and reducing the outage probability of D2D communication.

• The Journal of Korean Academic Society of Nursing Education
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• v.14 no.2
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• pp.252-261
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• 2008

Purpose: The purpose of this study was to explore how an educator can empower students by fostering communication, problem-solving, and self-directed learning ability. Method: In order to accomplish this purpose, 136 students who were attending J University and 105 students attending M University participated in the questionnaire. The students were freshman in the nursing or social welfare departments, There were 136 in the control group and 105 in the experimental group. The control group was given an applicable class of project learning. On the other hand, the experimental group was given traditional lessons once a week for 15 weeks. The research instrument used the measuring instruments developed by KEDI for communication and problem-solving and self-directed learning ability. Data was analysed by ANCOVA with SPSS/PC. Result: The results of analysis show that communication, problem-solving, and self-directed learning ability significantly increased in the experimental group. Conclusion: Based on the research finding, project learning has an educational value. Interdisciplinary cooperation project learning is effective for communication, problem-solving, and self-directed learning ability.

• Journal of Convergence for Information Technology
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• v.9 no.11
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• pp.212-217
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• 2019

This study is a convergence study attempted to understand the learning effects of oral health education class applying action learning on the communication ability and problem-solving ability in dental hygiene students. The subjects of this study were 37 students in the third year of dental hygiene department. As a result, the learning effects of oral health education class applying action learning on the communication ability(p<0.001) and problem-solving ability(p<0.001) showed positive changes in the pre and post comparison. The changes in the scores of sub-dimensions of the communication ability and problem-solving ability were also significant in the pre and post comparison. As the class applying action learning is effective in improving the learner's communication ability and problem-solving ability, it should be utilized as the leaner participation-oriented teaching method for design and operation of dental hygiene education.

• Journal of Convergence for Information Technology
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• v.12 no.5
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• pp.83-91
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• 2022

The purpose of this study was to identify the effect of problem solving ability and critical thinking disposition on communication competency of nursing students. The subjects of this study were 289 students at two universities located in C and G province. The collected data were analyzed by multiple regression analysis. The results showed that communication competency of nursing students was positively correlated with problem solving ability and critical thinking disposition. Communication competency was explained 40.6% of the variance in critical thinking and problem solving ability. Therefore, in order to improve the communication competency of nursing students, it is necessary to develop an educational program that improves critical thinking disposition and problem solving ability.

• Journal of KIISE:Software and Applications
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• v.32 no.4
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• pp.268-276
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• 2005

This paper deals with optimum communication spanning tree(OCST) problem. Generally, OCST problem is known as NP-hard problem and recently, it is reveled as MAX SNP hard by Papadimitriou and Yannakakis. Nevertheless, many researchers have used polynomial approximation algorithm for solving this problem. This paper uses evolutionary algorithm. Especially, when an evolutionary algorithm is applied to tree network problem such as the OCST problem, representation and genetic operator should be considered simultaneously because they affect greatly the performance of algorithm. So, we introduce a new representation method to improve the weakness of previous representation which is proposed for solving the degree constrained minimum spanning tree problem. And we also propose a new decoding method to generate a reliable tree using the proposed representation. And then, for finding a suitable genetic operator which works well on the proposed representation, we tested three kinds of genetic operators using the information of network or the genetic information of parents. Consequently, we could confirm that the proposed method gives better results than the previous methods.

• The Journal of Korean Academic Society of Nursing Education
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• v.25 no.4
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• pp.508-516
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• 2019

Purpose: This study was conducted to examine the effects of jigsaw cooperative learning on the communication ability, problem solving ability, critical thinking disposition, self-directed learning ability and cooperation of nursing students. Methods: A one-group, pre-post design was utilized with 92 nursing students as subjects. The data were analyzed using descriptive statistics and paired t-tests using SPSS/WIN 24.0. Results: The scores on problem solving ability, self-directed learning ability and cooperation were significantly increased after the education intervention. Conclusion: These findings indicate that cooperation learning is an effective intervention for improving problem-solving, self-directed learning ability, and cooperation in nursing education.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.1138-1144
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• 2008

To study the feasibility of applying wireless communication technology to the control of train for the effective control of train and for the reduction of cost and time to construct the necessary infra structure, we investigate into the application of the existing commercial WCDMA network to CBTC (communication-based train control) to grasp the obstacles and propose the solutions to circumvent them. The obstacles can be categorized into the hand-off problem, the interference problem near the stations, and the problem of radio shadow areas. We propose, as solutions, the cell overlap method and multi-terminal approach for the hand-off problem, the cell sectoring method for the interference problem, and establishment of new base stations along the railroad both to provide the wireless train control and communication service to the customers on the train which was otherwise impossible because of the shadowing effect.

• Journal of Convergence for Information Technology
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• v.9 no.12
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• pp.244-251
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• 2019

This study is to investigate the factors influencing the problem solving ability of dental hygiene and students' communication ability and critical thinking and autonomous educational climate. The subjects were 249 dental hygienists who attended two university from May 20 to June 1, 2018. Statistical analysis was performed with mean, t-test and one-way ANOVA. The overall mean of critical thinking tendency was 3.47 points, the total mean of communication life was 3.48 points. The overall mean of autonomous educational climate was 3.14 points and the total mean of problem solving ability was 3.40 points. The higher the critical thinking disposition score, the higher the problem solving ability. The higher the satisfaction of the major, the higher the problem solving ability. Therefore, if the program to improve communication ability, critical thinking tendency, and autonomous educational climate of college students majoring in dental hygiene is expected to improve the problem solving ability.

• The Journal of Korean Association of Computer Education
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• v.15 no.1
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• pp.33-41
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• 2012

The purpose of this study was to examine the effectiveness of problem-based learning(PBL) of information communication ethics on the problem-solving skills of fifth- and sixth-grade elementary school students about information communication ethics and their attitude. The findings of the study were as follows: First, the PBL-based teaching materials for information communication ethics could serve to stir up the interest of students by letting them face problem situations caused by the disfunction of the information society. Second, a wide variety of teaching-learning activities including cooperative learning and discussion were implemented while the selected students performed the given problem-solving tasks, and the activities had a very good effect on PBL-based information communication ethics education. Third, PBL-based information communication ethics education could be one of effective ways to boost not only the problem-solving skills of students but the teaching interest and capability of teachers.

• 제어로봇시스템학회:학술대회논문집
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• 1990.10b
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• pp.847-851
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• 1990

In this paper we present a method of reducing controller design problem from LQG/LTR approach to H.inf. optimization. The condition of the existance of the optimal solution is derived. In order to derive the controller equation for NMP plant we reduce the H.inf. LTR problem to Nehari's extension problem and derive the optimal controller equation which is best approximation for this problem. Furthermore, we show that the controller obtained by presented method guarantee the asymptotic LTR condition and stability of closed loop system.