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柳然國 忠州大學校 1988 한국교통대학교 논문집 Vol.22 No.-
This paper presents a theory which describes the transient response of a PLL to a periodic ramp voltage applied to the VCO for generating a chirp signal. With the appropriate choice of loop parameters and the ramp voltage rate to make the value of the normalized loop natural frequency within the range(0,1), the PLL's equation can be simplified to a nearly linear differential equation. Its asymtotic solution can be abtained by the perturbation method as is a rather small value. Simulation results in agreement with the analysis have been abtained. Its application to generate a linear frequency modulation waveform using a high-gain second-order PLL is considered.
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柳然國 忠州大學校 1999 한국교통대학교 논문집 Vol.34 No.2
The power-series analysis was based on the power-series model of a nonlinear system, where in the frequency-sensitive linear part of the circuit and memoryless nonlinear element were cleanly separate from each other. Using Voltera analysis, we show that the IM products do combine in phase, and cascade relation gives an accurate, not worst-case, prediction of distortion.
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朴容萬,柳然國 忠州大學校 1996 한국교통대학교 논문집 Vol.31 No.2
A simple SPICE model for IIR direct form 2 biquad section is described briefly in this paper. Digital filter consisting of up to four biquad sections can be analysed with SPICE. A simple model is given for application. An evaluation version of Pspice is used as a circuit simulation tool. This model opens possibilities of low-cost exercises and simulated laboratory experiments in design and education of digital signal processing.
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PSPICE 시뮬레이션을 위한 다이리스터 轉流回路 모델링
柳然國 충주대 산업과학기술연구소 1997 産業科學論文集 Vol.5 No.-
A thyristor model in dc chopper commutation circuits is described using the elements in the PSpice program. The improved model is used to simulate voltage commutated dc choppers. The results agree with theoretical ones. The model developed here is useful for analysis and design of dc thyristor choppers including the commutation circuits.
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柳然國 충주대 산업과학기술연구소 1996 産業科學論文集 Vol.4 No.-
The spice, circuit analysis program has been widely accepted as an industry standard for electronic circuit analysis, and it is used at colleges and universities. This paper describes the analysis of two model of directional coupler that can be used to obtain node voltages proportional to incident, refected and transmittied signals. These models are based on a previously developed multiple coupled node transmision line spice model. From computed node voltages, S-parameter are computed using the pspice post processor, probe, as an example for a filter consisting of transmission line sections. The result of this example are good and microwave analysis can be conducted with pspice, which can be a costeffective and readily useful analysis tool for educators and practicing engineers.
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대학생의 전공몰입도가 진로탐색행동과 진로목표안정성 및진로결정자기효능감에 미치는 영향
유연국,양진희 인문사회 21 2022 인문사회 21 Vol.13 No.5
The Effect of Career Commitment of College Students onCareer Exploration Behavior, Stability of Career Goals,and Career Decision-making Self-efficacyYeonguk Ryu & Jinhee Yang Abstract: The purpose of this study is to analyze the effect of career commitment of college students on career exploration behavior, stability of career goals, and career decision-making self-efficacy. The subjects of this study were 348 undergraduate students in 6 different departments (165 Engineering, 183 Humanities & Social Sciences) of 2 universities in Gy-do and Ch-do. For the analysis of this study, frequency analysis, correlation analysis, multiple regression analysis were performed according to the research problem using the SPSS/Win 21.0 statistical program. As a result of this study, college students’ major commitment had a significant positive correlation with career exploration behavior, career goal stability, and career decision-making self-efficacy. In addition, it was found that major commitment had a significant effect on career exploration behavior, career goal stability, and career decision-making self-efficacy. This study is meaningful in that it suggests that various teaching methods and teaching models that can increase college students’ major commitment should be designed. This study has a limitation in that it could not analyze the difference according to the specificity of each major. Key Words: College Students, Major Commitment, Career Exploration Behavior, Stability of Career Goals, Career Decision-making Self-efficacy 대학생의 전공몰입도가 진로탐색행동과 진로목표안정성 및진로결정자기효능감에 미치는 영향유 연 국*ㆍ양 진 희** 연구 목적: 이 연구는 대학생의 진로탐색행동과 진로목표안정성 및 진로결정자기효능감에 대한 전공몰입도의 영향력을 분석하는데 목적이 있다. 연구 방법: 연구대상은 Gy도와 Ch도에 소재한 2개 대학 6개 분야에 재학 중인 4학년 348명(공학 165명, 인문사회과학 183명)이었다. 분석은 SPSS/Win 21.0 통계프로그램을 이용해 연구문제에 따라 빈도분석, 상관관계분석, 다중회귀분석을 실시하였다. 연구 내용: 연구결과 대학생의 전공몰입도는 진로탐색행동과 진로목표안정성 및 진로결정자기효능감과 유의한 정적상관이 있으며, 또한 진로탐색행동과 진로목표안정성 및 진로결정자기효능감에 통계적으로 유의한 영향을 미치는 것으로 나타났다. 결론 및 제언: 이 연구는 대학생의 진로탐색행동과 진로목표안정성 및 진로결정자기효능감에 영향을 미치는 전공몰입도를 높일 수 있는 다양한 교수방법 및 모형이 설계되어야 함을 시사하였다는 점에서 의의가 있다. 이 연구는 각 전공이 갖는 특수성에 따른 차이를 분석하지 못했다는 점에서는 연구의 한계가 있다. 핵심어: 대학생, 전공몰입도, 진로탐색행동, 진로목표안정성, 진로결정자기효능감 □ 접수일: 2022년 9월 11일, 수정일: 2022년 10월 2일, 게재확정일: 2022년 10월 20일* 주저자, 한국교통대학교 전자공학과 교수(First Author, Professor, Korea National Univ. of Transportation, Email: yeonguk@ut.ac.kr)** 교신저자, 한국교통대학교 유아교육학과 교수(Corresponding Author, Professor, Korea National Univ. of Transportation, Email: jinheey@ut.ac.kr)
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安聖洙,柳然國 忠州大學校 1981 한국교통대학교 논문집 Vol.14 No.2
The Pulse motor is a form of synchronous motor which is designed to rotate a specific number of degrees for each electrical pulse received by its control unit. In this paper, it is the objective to obtain the mathematical model which describes th dynamic characteristics of variable reluctance(VR) pulse motor. In the development of the mathematical model for VR pulse motor. Then, these general equations are applied to the multiplestack type of VR pulse motor. These dynamic equations are numerically analysed by the simulation
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柳然國 忠州大學校 1987 한국교통대학교 논문집 Vol.20 No.2
Many investigators in the field of communications and navigation feel that subject of phase - locked loops is mature. Phase locked loops using charge pumps are found to have good potential for accurate phase tracking. The several factors are described and numercal calculations provides examples of typical errors. Inaccuracy as small as microcycles appears to be an attainable goal.
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유연국 韓國交通大學校 2022 한국교통대학교 논문집 Vol.57 No.-
A wideband band-stop filter showing improved high frequency band characteristics was designed. This filter was designed using an open stub with a spurline shape. A stepped impedance resonator(SIR) was introduced into the design to obtain a band broadening effect with improved selectivity. The designed band-stop filter was simulated and as a result, it was confirmed through the characteristic graph and the current density distribution diagram.
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