• Journal of Electrical Engineering and Technology
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• 제10권4호
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• pp.1415-1421
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• 2015

This paper presents a new algorithm called Quantum-behaved Electromagnetism-like Mechanism Algorithm which is used to solve economic load dispatch of power system. Electromagnetism-like mechanism algorithm simulates attraction and repulsion mechanism for particles in the electromagnetic field. Every solution is a charged particle, and it move to optimum solution according to certain criteria. Quantum-behaved electromagnetism-like mechanism algorithm merges quantum computing theory with electromagnetism-like mechanism algorithm. Superposition characteristic of quantum methodology can make a single particle present several states, and the characteristic potentially increases population diversity. Probability representation of quantum methodology is to make particle state be presented according to a certain probability. And the quantum rotation gates are used to realize update operation of particles. The algorithm is tested for 13-generator system and 40-generator system, which validates it can effectively solve economic load dispatch problem. Through performance comparison, it is obvious the solution is superior to other optimization algorithm.

• 한국초등과학교육학회지:초등과학교육
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• 제41권2호
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• pp.186-198
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• 2022

본 논문은 2022 교육과정 개정에 즈음하여 초등학교 과학 교육과정의 전자기 영역에서 다루어 온 내용에서 재고해야 할 문제들과 이에 대한 연구자들의 주장을 정리하여 교육과정 개선 방향에 대한 다양한 학문적 논의를 촉발하는 데 그 목적이 있다. 본 연구에서 논의된 내용을 요약하면 다음과 같다. 첫째 전자기 영역의 핵심개념은 힘의 매개체로서의 '전기장', '자기장'이라는 점에서 현재의 교육과정은 전자기 영역의 핵심개념을 담아내지 못하는 문제가 있다. 이를 해결하는 핵심개념 중심의 교육과정 구성을 위해 초등학교에서 역학과 전자기가 연계되는 것이 바람직하다. 둘째 전자기 이론에 기반한 공학기술의 발달 양상으로 본 연구에서 추출한 9가지 양상은 매우 다양한 교육적 맥락을 제공할 수 있다. 그렇지만, 현재의 교육과정은 이러한 다양한 맥락을 담아내지 못하고 있고, 전구를 활용한 전기회로라는 매우 제한된 내용에 초점을 맞추고 있다. 따라서 실생활의 기술과 연관된 다양한 맥락과 소재를 활용하도록 교육과정의 폭을 넓힐 필요가 있다. 현재보다 다양한 소재와 맥락을 활용함으로써, 개념학습뿐 아니라 STS 교육의 범위와 수준도 확장될 수 있다. 셋째, 전기회로 학습의 경우 전기회로와 전기장 개념의 연결의 어려움의 문제, 전기회로의 대표성 문제, 전기회로의 학습 난이도의 문제, 현상 중심의 전기회로 학습의 문제 등 여러 이슈를 고려해야 한다.

• 공학교육연구
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• 제25권5호
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• pp.94-103
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• 2022

In this study, we examined the cases of online video classes conducted under the COVID-19 situation for 46 first-year students majoring in electrical engineering at a 3-year college in Gyeongnam. The research was carried out according to the course development process so that classes could be conducted efficiently, focusing on electromagnetism(1) course in the second semester of the first year. The online class consisted of uploading PPT recorded videos and lecture materials to the LMS and giving assignments. The contents of the study were in the scope of examining learners' perceptions through online learning contents, assignment submission, mutual feedback between instructors and learners, university-level lecture evaluation, and free opinions on online video-based electromagnetism(1) classes. As a result of the study, it was confirmed that online lecture review and problem-solving are particularly important for understanding lecture materials, and also given the nature of engineering subjects that require plenty of mathematical expressions, the detailed and immediate feedback provided by instructor enhances learners' class satisfaction and understanding. Based on these, the direction of online classes to be developed after the COVID-19 pandemic and teaching and learning methods suitable for the characteristics of subjects were discussed.

• 영어영문학
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• 제57권6호
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• pp.939-958
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• 2011

Ezra Pound has an idea of poetry as a field of energy in which words interact with each other with kinetic energy. The energy field which Pound creates in his poem is analogous to the theory of electromagnetism developed by Michael Faraday and James Maxwell, who look upon the space around magnets, electric charges and currents not as empty but as filled with energy and activity. Pound argues that "words are charged with force like electricity," demonstrating that words charged with their own images or energies of positive or negative valence interact one another. This idea is similar to Faraday's concept of "line of force" which he used to represent the disposition of electric and magnetic forces in space. Pound's concept of "image" as an "intellectual and emotional complex in an instant" is remarkably consonant with the confluence of electric and magnetic fields that are coupled to each other as they travel through space in the form of electromagnetic waves. The instant profusion of conception and perception, much like that of electric and magnetic fields, enables Pound to move beyond the sequential and linear hierarchy in time and space. Particularly, Maxwell's stunning discovery that the electromagnetic waves propagate in space at 'the speed of light' has allowed Pound a relativistic sense of escape from the limitations of Newtonian absolute time and space. Pound's poetry transcends any geographical space and sequential time by rendering and juxtaposing images simultaneously. Pound was fully aware of light and electricity fundamental to what he called his world "the electric world." Pound's experiments in Imagism and Vorticism can be considered an attempt to rediscover a place for poetry in the modern world of science and technology. Almost all the appliances that we think of today as modern were laid down in the closing decades of the 19th century and the first decades of the 20th century, in response to the availability of electromagnetic energy. This paper explores how Pound responded to the age of modern technology and science, examining his conception of "image" through his many analogies and similes drawn from electromagnetism. Pound's imagist poetics and poetry come to embody, not only the characteristics of the electric age in the early twentieth century, but the principles of electromagnetism the electric age is based upon.

• Journal of Electrical Engineering and Technology
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• 제12권5호
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• pp.1729-1742
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• 2017

In designing System Protection Schemes (SPSs) in power systems, protecting transmission network against extreme undesired conditions becomes a significant challenge in mitigating the transmission line overloading. This paper presents an intelligent Special Protection and Control Scheme (SPCS) using of Differential Evolution with Adaptive Mutation (DEAM) approach to obtain the optimum generation rescheduling to solve the transmission line overloading problem in system contingency conditions. DEAM algorithm employs the attraction-repulsion idea that is applied in the electromagnetism-like algorithm to support the mutation process of the conventional Differential Evolution (DE) algorithm. Different N-1 contingency conditions under base and increase load demand are considered in this paper. Simulation results have been compared with those acquired from Genetic Algorithm (GA) application. Minimum severity index has been considered as the objective function. The final results show that the presented DEAM method offers better performance than GA in terms of faster convergence and less generation fuel cost. IEEE 30-bus test system has been used to prove the effectiveness and robustness of the proposed algorithm.

• Nuclear Engineering and Technology
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• 제49권1호
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• pp.43-53
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• 2017

Increasing the operation cycle length can be an important goal in the fuel reload design of a nuclear reactor core. In this research paper, a new optimization approach, electromagnetism mechanism (EM), is applied to the fuel arrangement design of the Bushehr WWER-1000 core. For this purpose, a neutronic solver has been developed for calculating the required parameters during the reload cycle of the reactor. In this package, two modules have been linked, including PARCS v2.7 and WIMS-5B codes, integrated in a solver for using in the fuel arrangement optimization operation. The first results of the prepared package, along with the cycle for the original pattern of Bushehr WWER-1000, are compared and verified according to the Final Safety Analysis Report and then the results of exploited EM linked with Purdue Advanced Reactor Core Simulator (PARCS) and Winfrith Improved Multigroup Scheme (WIMS) codes are reported for the loading pattern optimization. Totally, the numerical results of our loading pattern optimization indicate the power of the EM for this problem and also show the effective improvement of desired parameters for the gained semi-optimized core pattern in comparison to the designer scheme.

• 한국과학교육학회지
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• 제37권2호
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• pp.253-262
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• 2017

본 연구에서는 중등 전자기 수업에서 사용하는 시각적 표상의 역할에 대한 교사의 인식과 활용 실태를 조사하고 시각적 표상 활용과 관련해서 교사가 겪는 어려움을 파악하고자 하였다. 조사는 온라인 설문 방식으로 진행되었으며 과학교사 121명이 참여하였다. 연구 결과에 따르면, 교사들은 전자기 수업에서 시각적 표상 활용의 중요성에 대해 전반적으로 동의하였으나, 시각적 표상을 주로 과학 지식의 전달 도구로만 인식하는 경향이 있었다. 실제 수업에서 활용하는 방식은 주로 인터넷을 검색을 바탕으로 컴퓨터를 활용해 제시하는 방법을 가장 많이 사용하였다. 구체적으로 전자기 수업에서 널리 활용되는 세 가지 시각적 표상(검전기의 정전기 유도, 전류 주변의 자기장, 전동기의 구조와 원리)에 대해 활용 방식을 조사한 결과, 학생 중심 활용보다 교사 중심 활용이 두 배 가량 많았고, 시각적 표상의 '해석', '구성', '적용', '평가'와 관련해서는 '교사의 구성'이 가장 빈번한 것으로 나타났다. 이러한 교사 중심의 시각적 표상 활용 실태는 시각적 표상의 역할에 대한 교사의 제한적 인식과 밀접하게 연관되어 있는 것으로 보인다. 또한 주어진 세 가지 시각적 표상 활용과 관련된 교사의 어려움은 크게 '교사 자신', '학생', '표상 자체의 특성', '자료 부족이나 수업환경'에 기인한 것으로 범주화되었다. 시각적 표상의 연구와 개발에 있어서 이러한 요인들이 적극 고려되어야 하며 과학 수업에서 시각적 표상을 효과적으로 활용하기 위해서는 시각적 표상의 역할에 대한 교사의 인식이 확장되도록 하고, 교사의 표상 활용 능력을 증진시키는 것이 필요하다.

• 전기학회논문지
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• 제59권11호
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• pp.2083-2088
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• 2010

It is necessary to carry out quantitative analysis for the ABS hydraulic modulator to upgrade the system performances. Mathematical modeling method for the ABS hydraulic modulator, is suggested in the view of electromagnetism and fluid mechanics. Also, an analytic method is proposed for the resultant forces of electromagnetism and hydraulic pressure generated in the real vehicle ABS. The relationships between the design factor of Inlet & outlet solenoid valve and the system performance of ABS, are investigated through the analytical precess.

• 한국진공학회지
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• 제21권2호
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• pp.69-77
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• 2012

전자기장을 포함한 대부분의 물리학적 시스템이 벡터 미분 연산자들로 기술되며 또한 벡터연산을 통하여 계산된다. 그러므로 이들 벡터장들이 유전 및 자성물질 시스템들과 상호작용할 때 물리적 체계를 기술하고 계산하려면 정확한 전자기 벡터장의 지식체계를 이해할 필요가 있다. 그런데 이들 대부분 추상적 개념들을 직관적으로 이해하기에는 쉽지 않기 때문에 이들 추상적 개념의 시각화 표현 작업은 오늘날 지식정보화 수행과정에서 매우 중요한 과제의 하나다. 우리는 전자기학 체계를 구성하는 가장 기본적인 벡터장: $\vec{E}=-\vec{\nabla}_{\varphi}$, $\vec{D}={\epsilon}\vec{E}$, $\vec{\nabla}{\times}\vec{A}$, $\vec{B}={\mu}\vec{H}$, $\vec{B}={\mu}_0(\vec{\nabla}_{\varphi}{^*}+\vec{M})$들의 가시화 시뮬레이션을 Mathematica 프로그램으로 작성하여 추상적인 전자기벡터장의 시각화 모델을 제시하였다. 이 시뮬레이션을 전자기 벡터장의 물리학적 지식체계를 탐구해 가는 기본 플랫폼으로 활용할 수 있다.

• 한국초전도ㆍ저온공학회논문지
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• 제21권1호
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• pp.15-17
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• 2019

We present terahertz optical properties of $GdBa_2Cu_3O_{7-x}$ (GdBCO) superconducting thin films. GdBCO films with a thickness of about 105 nm were grown on a $LaAlO_3$ (LAO) single crystal substrate using a conventional pulsed laser deposition (PLD) technique. Using an Ar ion milling system, the thickness of the GdBCO film was reduced to 58 nm, and its surface was also smoothened. Terahertz (THz) transmission spectra through two different GdBCO films are measured over the range between 0.2 and 1.5 THz using THz time domain spectroscopy. Interestingly, the THz transmission of the thinner GdBCO film has been increased to six times larger than that of the thicker one, while the thinner film is still maintaining its superconducting property at below 90 K.