• 대한공업교육학회지
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• 제35권2호
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• pp.1-24
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• 2010

이 연구의 목적은 공업계 고등학교에서 프로젝트 학습법에 의한 기계공작실습이 학생들의 직업기초능력 향상에 미치는 효과를 실증적으로 규명하여 이와 유사한 연구를 수행하고자 하는 현직교사 및 예비교사들에게 연구의 기초 자료를 제공하는 데 있다. 이 연구에서 관심을 둔 직업기초능력은 의사소통 능력, 정보활용 능력, 팀워크 능력, 문제해결 능력, 도구활용 능력, 책임감 및 자신감 영역이었다. 이 여섯가지 영역에 대한 사전, 사후 검사 결과는 통계적으로 유의미한 차이를 보여 주었다. 따라서, 전통적인 실습 방법보다 프로젝트 학습법의 적용이 공업계 고등학교 학생의 직업기초능력 향상에 효과적이었다는 사실을 확인할 수 있었다. 이 연구 결과를 기초로 공업계 고등학생의 직업기초능력 향상을 위해 그리고 후속연구의 질적 제고를 위해 몇 가지 제언을 하고자 한다. 첫째, 문제해결력, 의사소통능력, 정보활용능력과 같은 직업기초능력이 있는 인재들을 효과적으로 양성하기 위하여 다양한 교수학습 방법의 모색과 활용이 필요하다. 둘째, 공업계 고등학교학생의 직업기초능력 향상 프로그램의 효과성을 측정하기 위한 보다 객관적인 검사 도구의 개발이 요구된다. 셋째, 프로젝트 학습법은 학습자들의 전인적 직업기초능력을 함양하는데 긍정적인 영향을 미친다는 연구결과에 비추어볼 때, 공업계 고등학교의 수업개선을 위하여 적극적으로 연구해야 할 필요가 있다. 따라서 이러한 연구와 적용이 실질적으로 이루어지도록 하기 위하여 프로젝트 학습법에 대한 교원연수를 강화하고 다양한 지원이 수반되어야 할 것이다.

• Transactions on Control, Automation and Systems Engineering
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• 제3권4호
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• pp.272-282
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• 2001

Uncertainties are the main reasons of deterioration of contour control of industrial articulated robot arm. In this paper, a high-precision contour control method was proposed to overcome some main uncertainties, such as torque saturation, system delay dynamics, interference between robot links, friction, and so on. Firstly, each considered factor of uncertainties was introduced briefly. Then proper realizable objective trajectory generation was presented to avoid torque saturation from objective trajectory. According to the model of industrial articulated robot arm, construction of Gaussian neural network controller with considering system delay dynamic, interference between robot links and friction was explained in detail. Finally, through the experiment and simulation, the effectiveness of proposed method was verified. Furthermore, based on the results it was shown that the Gaussian neural network controller can be also adapted for the various kinds of friction and high-speed motion of industrial articulated robot arm.

• 대한공업교육학회지
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• 제30권2호
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• pp.33-44
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• 2005

The purpose of this study is to suggest plans to improve the industrial high school through the inquiry of Competency-Based Education(CBE). The suggestions are as followings: (1) Selection and organization of the educational contents of industrial high school must be based on job analysis. (2) Instructional objectives must be defined as a performance objective and enabling objectives. (3) Instruction must be individualized in method, the instructional contents must be organized in the unit of module. (4) Evaluation system must be not knowledge based but performance-based. (5) Physical Environment of work shop must be organized based on facilities, equipments and machines abstracted by job analysis. (6) Competency-Based Teacher Education(CBTE) program is required to train competent teachers in practice.

• 한국학교보건학회지
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• 제14권2호
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• pp.177-186
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• 2001

This study was conducted to contribute to the basic data for decisions on environment policy improvement in health promotion, and school sanitation for students in elementary, middle and high schools, by analysing their cognitions and attitudes toward school environmental sanitation. This study was carried out with 1200 male and female students in elementary, middle and high schools in industrial, residential and heavy traffic areas for one month, from July 10 to August 11, 2000. The results of the survey follows. The most serious environmental problems in schools are the toilets, quality of drinking water and the classroom conditions. As for the priority areas for improvement, toilets topped the list followed by the classroom environment, and then by the quality of drinking water. Lack of administrative and financial support, the headmasters' disinterest, lack of interest by the students and parents, lack of awareness among teachers and insufficient effort were cited as the main reasons.

• 디지털산업정보학회논문지
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• 제16권2호
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• pp.117-128
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• 2020

The aim of this study was to examine price sensitivity of industrial products purchased via a group buying system and how industrial products for a group buying system differ from general industrial products, and then identify the major factors in selecting products and the important determinants in purchasing industrial products for school foodservices. The survey was conducted with 250 dietitians (teachers) in Gyeonggi-do Province, who were using industrial products for a group buying system and general industrial products. A paired t-test showed a difference in satisfaction between industrial products for a group buying system and general industrial products by factors, while statistically significant differences were found for red pepper paste, fermented soybean paste and soy sauce in all nine satisfaction factors, including product quality, packaging state, labeling, hygiene, item diversity, specification diversity, price appropriateness and supply. Moreover, analyzing price sensitivity for industrial products for a group buying system, using the PSM method with respect to the issue of high price, showed that the respondents considered that the current unit purchase prices were high for all items investigated. This study suggests that schools would purchase more industrial products for a group buying system, when the pricing of the products are considered with the purchase intention of dietitians (teachers).

• 대한공업교육학회지
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• 제30권2호
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• pp.3-11
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• 2005

The purpose of this study is to measure the level of the key competencies of industrial high school students and to use it as the basic material so as to improve the key competencies. The subject was 359 industrial high school students(boys: 244, girls: 115) in Seoul, Daejeon, Gwangju, and Busan. The instrument used to measure the key competencies is that developed by Cheol-Young Jeong, which was partly revised with the help of a group of experts. The results of this study showed some of skills were below an average of 3.0, which were writting skill(M=2.85) and speaking skill(M=2.96) in communication skills, logical thinking(M=2.98) in problem solving skills, leadership skill(M=2.88) in interpersonal skills, and self-improvement skill(M=2.96) and the spirit of public service(M=2.93) in self-management and self-improvement skills. But technology skills were above an average of 3.0. And it appeared that technology skills(P=.023) depended on having a certificate or not, and so did communication skills(P=.020) and problem solving skills(P=.034) on the types of a course(employment or entrance into a college). So, to strengthen the key competencies which appeared below an average of 3.0 in this study, not only does the curriculum of industrial high schools need to be reorganized, but systematic strengthening program of key competencies should also be developed.

• 직업교육연구
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• 제36권2호
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• pp.68-94
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• 2017

이 연구는 산업체 HR 담당자가 기대하는 마이스터고 학생 이미지와 현재 인식하는 이미지의 차이를 분석하여, 학교 교육과 취업 정책 발전 방안에 기초자료를 제공하고자 한다. 이를 위하여, Osgood(1957)이 개발한 의미 분별법을 조사도구로 선정하였으며, 마이스터고 학생에 관한 이미지를 조사하기 위해 Osgood이 제안한 50개의 형용사군과 선행연구들이 추가로 사용한 21개의 형용사군 중 전문가 10명의 타당도 검사를 거쳐 내용타당도 값을 충족시키지 못하는 형용사를 제외하고 최종 20개의 형용사를 선정하였다. 완성된 설문지를 광역권, 비 광역권으로 비율표집을 통하여 최종 표본 350개를 선정하였으며, 총 600개의 설문지를 발송하여 230개의 설문지를 회수하였다. 회수율은 38.3%로 나타났다. 결과는 다음과 같다. 첫째, 산업체 HR 담당자가 기대하는 마이스터고 학생의 이미지는 평균 2.49로 나타나 긍정적인 이미지를 기대한다고 할 수 있다. 또한 형용사를 그룹화 하기 위하여 요인분석을 한 결과 3개의 요인인 외면적 요인, 사고방식 요인, 내면적 요인으로 도출되었다. 둘째, 산업체 HR 담당자가 현재 인식하는 마이스터고 학생의 이미지는 평균 3.24로 나타나 긍정적인 이미지로 마이스터고 학생을 인식한다고 할 수 있다. 셋째, 산업체 HR 담당자가 현재 인식하는 마이스터고 학생 이미지는 기대하는 마이스터고 학생 이미지에 미치지 못하는 것으로 나타났다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 Proceedings ICPE 01 2001 International Conference on Power Electronics
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• pp.247-250
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• 2001

This paper presents a simple and cost effective circuit topology of single-ended type high frequency quasi-resonant PWM inverter using IGBTs, which can operate under wide soft switching operation range based on ZCS for main power switch as compared with a conventional active voltage-clamped ZVS-PWM high frequency quasi-resonant inverter developed previously. In principle, this new circuit topology can efficiently operate under a constant frequency PWM control-based power regulation scheme. In particular, it is noted that the zero current soft switching (ZCS) commutation can achieve for the main active power switch. On the other hand, the zero voltage soft switching (ZVS) commutation can also achieve for the auxiliary active power switch. The operating principle of this high-frequency Inverter treated here and its power regulation characteristics are illustrated on the basis of the simulation and feasible experimental results.

• Journal of Power Electronics
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• 제2권3호
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• pp.181-188
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• 2002

The utility interfaced sinewave modulation Inverter for the solar photovoltaic power conditioner with a high frequency transformer is presented for residential applications. As compared with the conventional full-bridge hard switching slnewave PWM inverter with a high frequency link, the simplest single-ended edge-resonant soft switching sinewave inverter with a sinewave duty cycle pulse control scheme is implemented, resulting in size and weight reduction, low cost and high efficiency This paper presents a prototype system of the sinewave zero voltage soft switching sinewave inverter for solar power conditioner, along with its operating principle and unique features. In addition to these, this paper discusses a control implementation to deliver high quality output current. Major design of each component and the power loss analysis under actual power processing is also discussed and evaluated from an experimental point of view A newly developed utility-connected sinewave power conditioning circuit which achieves 92.5% efficiency under 4kW output is demonstrated.

• 대한안전경영과학회지
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• 제16권2호
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• pp.1-9
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• 2014

This study tried to propose plan to prevent human error of railroad driver among human error of railroad worker which takes great share in railroad accident. For this, in order to maintain correlation between the accident actually occurred after the opening of high-speed railroad and experience of accident that did not happened, survey on respondent was analyzed by conducting survey on KTX captain who is working in driving work of high-speed railroad, and instruction management team manager who manages KTX captain and captain. This thesis classified the factors by human factor, job factor, environment factor, organization factor, and established human error management model by comparing and analyzing how each factors have spatial interrelations with a railroad accident. The purpose of this study is to contribute to make safe railroad, and reliable railroad by preventing human error accident by minimizing human error of high-speed railroad drivers, and improving driving workers to cope accurately and fast with irregularities through various institutional improvement, improvement of driving facilities, improvement of operating room environment, and improvement of education system.