• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 D
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• pp.2252-2254
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• 2001

This paper proposes a algebraic parameter determination of MRAC (Model Reference Adaptive Control) controller using block Pulse functions and block Pulse function's differential operation. Generally, adaption is performed by solving differential equations which describe adaptive low for updating controller parameter. The proposes algorithm transforms differential equations into algebraic equation, which can be solved much more easily in a recursive manner. We believe that proposes methods are very attractive and proper for parameter estimation of MRAC controller on account of its simplicity and computational convergence.

• 대한수학교육학회지:학교수학
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• 제13권4호
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• pp.651-674
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• 2011

함수적 사고는 학교 수학에서 가장 중요한 주제이고 함수적 사고 지도의 목적은 학생들의 함수적 사고를 향상시키는 것이라고 할 때 초등학교에서 함수적 사고를 지도한다는 것은 함수적 사고의 속성인 지정과 종속의 연관이 내재된 현상을 의미하는 함수적 사고이다. 함수적 사고를 습득했는지에 대한 평가 방법은 함수적 사고의 지도를 통해 학생들이 함수적 사고를 한다고 판단할 수 있는 학생들의 활동이다. 이를 위해서 교사는 함수적 속성을 갖는 타 교과의 내용과 관련된 함수적 상황의 형태의 전형적인 예(paradigm)을 제공하고, 적절한 발문을 통해 안내해야 한다. 본 연구의 목적은 타 교과와 연결된 상황 설정을 통한 함수적 사고의 지도 방안을 구안하고 적용하여 보다 발전된 지도 방안을 모색하는 것이다. 이를 위해 본 연구에서 제안하는 지도 방안은 함수적 상황의 준비단계, 적용단계, 반성단계의 3단계로 구성되며, 각 단계에서 지도해야 할 방안들을 제안하고자 한다.

• International Journal of Internet, Broadcasting and Communication
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• 제12권2호
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• pp.127-136
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• 2020

This paper presents an environment for rule-based English-Korean machine translation system, which supports the translation domain adaptation and the continuous translation quality improvement. For the purposes, corpus is essential, from which necessary information for translation will be acquired. The environment consists of a corpus construction part and a translation knowledge extraction part. The corpus construction part crawls news articles from some newspaper sites. The extraction part builds the translation knowledge such as newly-created words, compound words, collocation information, distributional word representations, and so on. For the translation domain adaption, the corpus for the domain should be built and the translation knowledge should be constructed from the corpus. For the continuous improvement, corpus needs to be continuously expanded and the translation knowledge should be enhanced from the expanded corpus. The proposed web-based environment is expected to facilitate the tasks of domain adaptation and translation system improvement.

• 공학교육연구
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• 제17권4호
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• pp.95-101
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• 2014

As other major, students have difficulties to be successfully adapted to computer science major without some interest and skill to computer programming. In this paper, we try to find successful factors for computer science major freshmen students to computer programming. The factors we focused are programming experience before college entrance, taking liberal arts/natural science courses at high school, application motivations to computer major, existence of mentors, satisfaction to his/her computer department, student's holland job aptitude code. After analysis, taking liberal arts/natural science courses at high school, satisfaction to computer department, some holland job aptitude code are significant to their successful adaptation to computer major. Also, we found the holland job apptitude code is closely related to student's satisfaction to their major for engineering students including computer science students. Our analysis results will be a suggestion for designing computer science education program with students who enters college without some aptitude or preparation to his major.

• 융합경영연구
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• 제7권2호
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• pp.15-23
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• 2019

Purpose - This describes a comparative study about the Online banking system between developing country (Bangladesh) and developed country (South Korea). Research design, data, and Methodology - Use comparison as the descriptive situation, secondary data were used to determine the differences between both countries with respect to Online banking. And also show the representative cases of online banking, kakao bank and bKash. Result - The results showed that the data indicate that both nations are dissimilar in providing basic and additional services offered by their traditional commercial banks. And different cultures and traditions in financial industry will play a major role in the adaption and development of online banking industry among different nations. Belief on lack of effort on educating the consumers toward online banking further affected the usability of online banking in both countries. Conclusions - this comparative study provides insightful guidelines for the future development of online banking industry in developing nations and worldwide. Also, managerial and empirical implications are discussed with suggestions for future research.

• 가정과삶의질연구
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• 제31권2호
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• pp.77-91
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• 2013

The purpose of this study is to investigate if self-esteem mediates the effects of conflict with parents, peer relationship and school adaptation in relation to the satisfaction with life of adolescents in multicultural families. The subjects of the present study are 152 adolescents of multicultural families ranging from 12-16 years of age from the cities of Seoul, and Daegu, and the provinces of Gyeong-gi, and Gyeong-buk, South Korea. The measured constructs are Conflict with Parents, Friendship, School Adaption, Self- Esteem and Satisfaction with Life Scale. The dates were analyzed using path analysis. The major results of this study demonstrate that self-esteem does not mediate the effects of conflict with parents and peer relationship in relation to the satisfaction with life of adolescents in multicultural families. However, self-esteem does mediate the effects of school adaptation in relation to the satisfaction with life of adolescents in multicultural families.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 춘계학술대회 논문집 에너지변화시스템부문
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• pp.32-34
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• 2009

The field oriented control of induction motors is widely used in high performance applications. However, detuning caused by parameter disturbance still limits the performance of these drives. In order to accomplish variable speed operation, conventional PI-like controllers are commonly used. These controllers provide limited good Performance over a wide range of operation, even under ideal field oriented conditions. This paper is proposed model reference adaptive fuzzy control(MFC) and artificial neural network(ANN) based on the vector controlled induction motor drive system. Also, this paper is proposed control of speed and current using fuzzy adaption mechanism(FAM), MFC and estimation of speed using ANN. The proposed control algorithm is applied to induction motor drive system using FAM, MFC and ANN controller. Also, this paper is proposed the analysis results to verify the effectiveness of this controller.

• 한국게임학회 논문지
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• 제16권1호
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• pp.93-102
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• 2016

본 연구는 학습장애 학생의 학교생활 적응을 위하여 로봇 프로그래밍 교육을 실시함으로써 학습장애학생의 학습된 무기력과 자발적 언어 사용에 미치는 영향을 살펴보고자 하였다. 연구에 참여한 학생은 실제 특수교육 지원을 받는 초등학교 4학년 학습장애학생이다. 연구 결과 로봇 프로그래밍 교육은 학습장애학생의 학습된 무기력을 감소시키며 통합학급에서 자발적 발화량을 증가시켰다. 본 연구 결과를 기반으로 학습장애학생을 위한 강점 기반 교육이나 게이미피케이션을 적용한 중재가 실제 교육 현장에서 효과적으로 활용될 수 있는 방안을 제안하였다.

• Journal of Power Electronics
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• 제19권4호
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• pp.1000-1010
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• 2019

The use of internal-model-based linear controller, such as resonant controller, is a well-established technique for the current control of grid-connected systems. Attractive properties for resonant controllers include their two-sequence tracking ability, the simple control structure, and the reduced computational burden. However, in the case of continuous-designed resonant controller, the transient performance is inevitably degraded at a low switching frequency. Moreover, available design methods for resonant controller is not able to realize the direct design of transient performances, and the anticipated transient performance is mainly achieved through trial and error. To address these problems, the zero-order-hold (ZOH) characteristic and inherent time delay in digital control systems are considered comprehensively in the design, and a corresponding hold-equivalent discrete model of the grid-connected converter is then established. The relationship between the placement of closed-loop poles and the corresponding transient performance is comprehensively investigated to realize the direct mapping relationship between the control gain and the transient response time. For the benefit of automatic tuning and real-time adaption, analytical expressions for controller gains are derived in detail using the required transient response time and system parameters. Simulation and experimental results demonstrate the validity of the proposed method.

• Journal of Power Electronics
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• 제15권5호
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• pp.1409-1420
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• 2015

In this paper, an algorithm using two bi-quad filters to suppress the wide-band resonance for PMSM servo systems is proposed. This algorithm is based on the double bi-quad filters structure, so it is named, "double bi-quad filter." The conventional single bi-quad filter method cannot suppress unexpected mechanical terms, which may lead to oscillations on the load side. A double bi-quad filter structure, which can cancel the effects of compliant coupling and suppress wide-band resonance, is realized by inserting a virtual filter after the motor speed output. In practical implementation, the proposed control structure is composed of two bi-quad filters on both the forward and feedback paths of the speed control loop. Both of them collectively complete the wide-band resonance suppression, and the filter on the feedback path can solve the oscillation on the load side. Meanwhile, with this approach, in certain cases, the servo system can be more robust than with the single bi-quad filter method. A step by step design procedure is provided for the proposed algorithm. Finally, its advantages are verified by theoretical analysis and experimental results.