• KSII Transactions on Internet and Information Systems (TIIS)
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• v.17 no.6
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• pp.1743-1758
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• 2023

Automatic modulation classification is a critical algorithm for non-cooperative communication systems. This paper addresses the challenging problem of closed-set and open-set signal modulation classification in complex channels. We propose a novel approach that incorporates a self-learning filter and center-loss in Deep Residual Shrinking Networks (DRSN) for closed-set modulation classification, and the Opendistance method for open-set modulation classification. Our approach achieves better performance than existing methods in both closed-set and open-set recognition. In closed-set recognition, the self-learning filter and center-loss combination improves recognition performance, with a maximum accuracy of over 92.18%. In open-set recognition, the use of a self-learning filter and center-loss provide an effective feature vector for open-set recognition, and the Opendistance method outperforms SoftMax and OpenMax in F1 scores and mean average accuracy under high openness. Overall, our proposed approach demonstrates promising results for automatic modulation classification, providing better performance in non-cooperative communication systems.

• Korean Medical Education Review
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• v.18 no.3
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• pp.167-173
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• 2016

This study analyzed participation experiences in a voluntarily learning community using both quantitative and qualitative methods. Sixty freshmen and sophomore medical school students in 10 learning communities participated in the study. At the time of the survey, learning communities had been operating for 10 weeks and had weekly in-person meetings. Satisfaction questionnaires and reflective essays were given and analyzed. The results showed that learning community experiences were effective in promoting students' learning motivation, cooperative learning, responsibility, and communication skills. Three essential topics and nine subjects were analyzed in the reflective essays. Three essential topics were conflict with each other due to the difference, forming deep relationships, and sharing and learning together with an in-depth study. The results of this study will contribute to collaborative learning culture and the development of learning communities in medical schools.

• 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.

• Child Health Nursing Research
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• v.23 no.1
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• pp.48-60
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• 2017

Purpose: This study was conducted to develop and test effects of a child health management program based on cooperative learning for mothers of preschool children. Methods: For this quasi-experimental study, a nonequivalent control group pretest-posttest design was used. Outcome measures were level of child health management self-efficacy, child health management practices, child's health behavior. Participants were 55 mothers (experimental group 28, control group 27). The program was composed of 6 categories of home health management for preschool children, and provided for three 120-minute sessions. Data were collected from September to October, 2015, at 3 times: baseline, 3 and 6 weeks after beginning the intervention. Data were analyzed using SPSS/WIN 21.0 program. Results: After 3 and 6 weeks, there were significant differences between the two groups in child health management self-efficacy (F=18.33, p<.001), child health management practices (F=8.91, p<.001), and child's health behavior (F=9.91, p<.001). Conclusion: Study findings indicate that this child health management program based on cooperative learning is effective and can be recommended as an intervention for mothers of preschool children. It will contribute to enhanced child health management self-efficacy and health management practices and improved child's health behavior.

• English Language & Literature Teaching
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• v.11 no.1
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• pp.57-76
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• 2005

This study provides a rationale for using project-based learning with Korean students of English in Korea; in addition, it describes the process of creating and implementing project-based learning in the classroom and gives examples of how this unique teaching and learning method has been used successfully to teach learners with different levels of English proficiency. The first two chapters of the study examine the nature of project-based learning by comparing it with related fields of study, such as language teaching syllabi and methods, cognitive psychology, constructivists' views and interaction theory. The latter part of the study deals with issues related to applying project-based learning in Korean English classes. It emphasizes the importance not only of motivating active group effort and participation, but also in creating a trusting, cooperative relationship between group members in order to have a successful accomplishment of a project. The study concludes with implications for future studies.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.16 no.5
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• pp.1755-1777
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• 2022

The development of wireless communication technology has led to the underutilization of radio spectra. To address this limitation, an intelligent cognitive radio network was developed. Specific emitter identification (SEI) is a key technology in this network. However, in realistic non-cooperative scenarios, the system may detect signal classes beyond those in the training database, and only a few labeled signal samples are available for network training, both of which deteriorate identification performance. To overcome these challenges, a meta-learning-based open-set identification system is proposed for SEI. First, the received signals were pre-processed using bi-spectral analysis and a Radon transform to obtain signal representation vectors, which were then fed into an open-set SEI network. This network consisted of a deep feature extractor and an intrinsic feature memorizer that can detect signals of unknown classes and classify signals of different known classes. The training loss functions and the procedures of the open-set SEI network were then designed for parameter optimization. Considering the few-shot problems of open-set SEI, meta-training loss functions and meta-training procedures that require only a few labeled signal samples were further developed for open-set SEI network training. The experimental results demonstrate that this approach outperforms other state-of-the-art SEI methods in open-set scenarios. In addition, excellent open-set SEI performance was achieved using at least 50 training signal samples, and effective operation in low signal-to-noise ratio (SNR) environments was demonstrated.

• Research in Mathematical Education
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• v.6 no.1
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• pp.1-28
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• 2002

This study explored teachers (n = 219) from northern, central, southern and eastern Taiwan concerning their views about children's learning difficulties, mathematical instruction and school mathematics curricular. Results showed that teachers' mathematics knowledge or their instruction methods had no significant influence on their views of children's learning difficulties. Even though teachers indicated that understanding of abstract mathematical concepts was the most prominent difficulty for children, they tended to employ direct instruction rather than constructive and cooperative problem solving in their teaching. However, teachers' views of children's learning difficulties did influence their instructional practice. Results from in-dept interviews revealed that there were some obstacles that prevented teachers from putting constructiveism perspectives of instruction into teaching practice. Further investigation is needed to develop a better understanding of epistemology and teaming psychology as well as to help teachers create constructive learning situations.

• Journal of The Korean Association of Information Education
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• v.15 no.1
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• pp.137-146
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• 2011

The elementary school English Education Course consists of four integrated aspects of language (Listen, Speak, Read, Write) used to develop skills for daily communication in English. yet the 6th Grade English Education Curriculum focuses almost exclusively on sentence completion through copying and "fill-in-the-blank" exercises. Further, these activities are insufficient time to develop literacy skills. Additionally, the curriculum's emphasis on memorization within the written component is very time consuming for students, leading many to develop negative opinions of the written aspect of a comprehensive understanding of English. This thesis attempts to address each these problems through development of a web-based Learning Model for Cooperative Writing in English. The study resulted in three observations. First, this model overcame limitations of the current teaching model in schools. Second, students expressed more interest in the experimental model than in the current curriculum and standard pedagogical methods. Finally, the study demonstrated that improvement of English literacy is indeed possible using the model presented here.

• Journal of Physiology & Pathology in Korean Medicine
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• v.30 no.3
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• pp.137-141
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• 2016

The purpose of this study is to evaluate the effect of PBL program for cooperative practice between western and korean medicine. Third and fourth grade medical and Korean medical school students (experimental group: 16 students, respectively) in the Pusan National University were included in the study. Teaching methods was Problem-Based Learning (PBL) which was consist of 4 western and 4 korean medical students and 2 tutors. Modules have been developed by 8 subject experts or educational experts, who have also participated in the PBL as tutor. The program has been proceeded for 4 weeks, where two face-to-face discussions and self-directed learning were done in each module. In experimental group, students' perceptions about the other medicine were surveyed before and after the program and students' and tutors' satisfaction on the program was investigated. The perception survey was also done in the control group at the beginning of the study. The students who participated in this program had more positive perceptions about the other medicine, compared with control group. There were only significant increases on the items of 'understanding of the other medicine' between before and after the program, where no statistical differences were not observed in 'perception of the other medicine or cooperative practice'. Satisfaction in the program was positive.The PBL program enabled students to understand the other medicine, but it didn't lead changes of their perception. To improve students' perception, the program need to be kept steadily.

• International Journal of Contents
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• v.9 no.4
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• pp.45-51
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• 2013

The purpose of this paper is to analyze educational theories and practices represented in the movie Dangerous Minds. This paper begins by giving the overview of the movie. Then this paper makes an analysis of the pedagogical methods and practices used by the teacher in the movie, which can encourage students to fulfill their academic success and social mobility. The lives of students at risk are transformed through the teacher's beliefs and pedagogical practices based on the constructivism, leading students on a path of selfdiscovery and self-empowerment. What is imperative in the students' lives here is their intrinsic motivation and self-efficacy toward the self and their educational system. By providing constructivist pedagogical paradigms and viewing these media texts within the context of an urban school, this paper intends to introduce educational theories and methods which can create better educational environment for students. In short, this study explores teaching theories and methods represented in the movie based on the constructivist perspectives, which are supposed to fully cultivate the potential of students.