• Journal of electromagnetic engineering and science
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• v.3 no.1
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• pp.12-16
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• 2003

In this paper, low noise amplifiers with coplanar waveguide structure are presented for Wireless LAN data communication application. For comparison of microwave performance, LNAs of cascode type and balanced type using cascode cell with the same substrate and same bias conditions are designed and implemented. A cascode type of LNA shows the gain of 12.45 ㏈, input return loss of 11.63 ㏈, and noise figure of 1.52㏈. A balanced type of LNA using cascode cell shows the gain of 6.58 ㏈, input return loss of 16.6 ㏈, and noise figure of 1.18 ㏈.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2000.11a
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• pp.225-228
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• 2000

In this paper, the design for a low noise amplifier with the EM simulation is presented. The ATF36077 pHEMT device is applied to design LNA for U-NII frequency band (5 GHz ～ 6 GHz). The matching networks have been designed by the only open ended stub in order to reduce parasitic effects generated from a via structure. Through EM simulator, the simulation result shows that the linear gain (@5.5 GHz) is over 10 dB, input return loss and output return loss (@ 5.5 GHz) are a below 10 dB respectively, and the 3rd order intercept point is about 17 dBm.

• International journal of advanced smart convergence
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• v.8 no.4
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• pp.113-120
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• 2019

Recently, the artificial intelligence(AI) is used in various environments in life, and research on this is being actively conducted in education. In this paper, we designed a Design-Based Research(DBR)-based AI programming education program and analyzed the application of the program for the improvement of understanding of AI in elementary school. In the artificial intelligence education program in elementary school, we should considerthat itshould be used in conjunction with software education through programming activities, rather than creating interest through simple AI experiences. The designed education program reflects the collaborative problem-solving procedures following the DBR process of analysis - design - execution - redesign, allowing the real-world problem-solving activities using AI experiences and block-type programming language. This paper also examined the examples of education programs to improve understanding of AI by using Machine Learning for Kids and to draw implications for developing and operating such a program.

• Journal of Korean Elementary Science Education
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• v.30 no.1
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• pp.93-101
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• 2011

The purpose of this research is to find out the change in graduate students' perceptions before and after they take a class on qualitative research. The class on qualitative research was held by the researcher in the winter semester of 2009. The subjects are nine graduate students (two male and eight female) and all elementary school teachers. An open-ended questionnaire with 5 items was used. The responses were interpreted, analyzed and categorized into several main conceptions. The results are as follow: First, some students perceived qualitative research as the counterpart for quantitative research, some perceived that qualitative research supplements quantitative research, while the rest of them had no concept of either before they took the class. Second, they all agreed that qualitative research is necessary in gifted education after they took the class. In order to better understand what is happening in classrooms, in terms of gifted education, a well organized curriculum for gifted education should be developed and conducted in graduate schools.

• Journal of Korean language education
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• v.28 no.4
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• pp.87-119
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• 2017

The purpose of this study is to classify research methods used in Korean language education studies with a focus on identifying how and what quantitative research methods are utilized in these studies. Analyzing articles published in the Journal of Korean Language Education from 2005 to 2016, we found a trend that as a replacement for secondary research, primary research played a more prominent role after 2010, as the number of quantitative studies and studies using mixed methods increased. We also found that within quantitative studies of Korean language education, research themes and statistical analyses became diversified after 2010. In order for quantitative research to contribute continuously to Korean language education, the quality of research has to improve. In particular, quantitative researchers in this area should: (a) increase their general understanding of statistical methods, (b) conduct "power analysis" to determine the appropriate sample size for hypothesis testing, and (c) be aware of measurement issues such as measurement equivalence and DIF when measuring latent psychological constructs. It is also important to notice that these points above should be considered carefully in the planning and designing stage for researchers.

• The Journal of Korean Medicine
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• v.36 no.3
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• pp.1-13
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• 2015

Objectives: This study aimed to investigate the experiences and awareness of Korean Medicine professors towards research ethics issues and curriculum development. Methods: Electronic mails for requesting the survey participation were sent to 531 professors who were listed in the DB of Association of Korean Medicine. Professors who agreed to participate in the survey were connected to the self-administered questionnaire site, and the responses were stored in real time. Professors were asked the experience of research misconduct cases, the necessity, contents and evaluation method of research ethics education, etc. ANOVA was performed to test the differences of ethics education effects among sub-groups of respondents. Results: Of 137 professors who opened the e-mail, 127 completed the questionnaire. Most professors (87.4%) reported to witness the research misconduct cases, and felt the necessity of research ethics education for professors as well as students. 31.4% of respondents preferred the practice-focused course, and 43.3% preferred the PASS/FAIL basis evaluation system. Professors with shorter education career and professors majoring basic Korean Medicine expected higher effect of ethics education than others. For detailed items of research ethics education, 'ethical writing' and 'ensuring research integrity' were prioritized in the aspects of both personal ethics and social demand. Conclusions: In this study, detailed matters of research ethics education in Korean Medicine area were drawn. Further study and policy development are needed to facilitate the introduction of formal education of research ethics.

• Research in Mathematical Education
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• v.1 no.1
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• pp.35-42
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• 1997

Activation of comparative studies on mathematics education is discussed. Some related researches are reported on. Some suggestions for effective research are given.

• Korean Medical Education Review
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• v.21 no.2
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• pp.73-79
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• 2019

Academic medicine is built from a foundation of education, research, and patient care. Since good patient care results from the application of medical research and continuous education, these three components cannot be separated for medical development to occur. In Korea, many obstacles hinder the achievement of academic medicine, such as an inefficient medical delivery system, limitations of primary care, low insurance prices, and no long-term health care plan. Medical education has changed to outcome-based education, but presented temporal integration status. Governance of healthcare research is not centralized, and Korea is awarded relatively fewer grants than other countries. Medical professors have reached a burnout state due to patient care responsibilities in addition to research and education duties. Many medical systems, including the medical delivery system and insurance problems, may contribute to distrust between doctors and patients. The government is not involved in a long-term health care policy. The multitude of factors mentioned here are hindering the achievement of academic medicine in Korea.

• Communications of Mathematical Education
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• v.28 no.3
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• pp.303-320
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• 2014

The purpose of research is to analyze research trends and methods in a total of 709 studies published in five domestic mathematics education journals issued by Korea Citation Index (KCI) for the last 10 years (2003-2013) and strands in stages of research methods among mixed methods studies. As a result, the majority of articles in the five journals used either qualitative or quantitative methods and mixed methods research was less than 10 % of the total number of studies. The majority of mixed methods was research equally mixing qualitative and quantitative methods. The mixed methods research consisted primarily of quantitative with descriptive statistics and very little qualitative with conceptual framework based on theoretical background. Our results provide not only trends of the current research methods, but also implications for various future research paradigms in mathematics education.

• Journal of The Korean Association For Science Education
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• v.12 no.3
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• pp.35-47
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• 1992

The purpose of this study was to develop a data base system for the information on science education research and development. As a part of this study, a data base program was developed on the Macintosh SE using the 4th Dimension from ACI. The data base consisted of two files, dissertation and journal. The information on the 107 theses including the master's theses and the doctoral dissertations from the Department of Scince Education, Seoul National University and on the 640 papers on science education from the first issues to the 1991 issues of five selected science education journals was input into the data base. The selected five Journals were Journal of the Korean Association for Research in Science Education(published by the Korean Association for Research in Science Education, 148 papers), Teaching Physics(published by Korean Physical Society, 164 papers),Chemical Education(published by The Korean Chemical Society, 98 papers), The Korean Journal of Biological Education(published by The Korean Society of Biological Education, 148 papers), and Journal of Science Education(published by Science Education Center, College of Education, Seoul National University,82 papers).