• 전기의세계
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• v.42 no.12
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• pp.52-64
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• 1993

본고에서는 앞으로 동기전동기중 소형전동기로서 산업사회에 크게 공헌할 것으로 생각되는 VRM의 회전자를 2중돌극(double salient pole) 형태로하여 전기에너지를 효율적으로 공급받는 SRM(switched reluctance motor)과 PM Motor를 중심으로 현재의 상황과 그 전망에 대해 서술하고자 한다.

• The Korean Publising Journal, Monthly
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• s.254
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• pp.28-28
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• 1999

스펜스의 "천안문"은 고난에 찬 중국현대사를 마치 한편의 소설이나 영화처럼 생생하게 소개한 저작이다. 이 책이 지식인 중심으로 지난 백년간의 중국혁명을 서술했다면, 이스트만의 "중국사회의 지속과 변화"는 4세기에 걸친 근대 시기의 사회 경제사를 추적한다.

• Journal of the KSME
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• v.34 no.2
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• pp.78-87
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• 1994

이 글에서는 아직까지 우리나라의 기술수준이 낙후되어 있고 앞으로 개발의 여지가 많은 건설중 장비, 조선산업 등에서 많이 사용되는 중후판을 대상으로 하는 보호가스 아크용접(GMAW ; Gas Metal Arc Welding)자동화에 관하여 서술하고자 한다.

• Journal of the KSME
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• v.21 no.3
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• pp.187-196
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• 1981

이 글에서는 열역학에 연관된 기본법칙을 서술하고 에너지의 효율적 이용에 대하여 제 1 법명 하고자 한다. 여기서는 열학적에 연관된 각종의 정의나 설명 등에 있어 지나친 엄밀성은 피하 고자 한다.

• Journal of Digital Convergence
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• v.11 no.12
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• pp.589-598
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• 2013

The research about nursing students' experience on the clinical environment observation is essential to developed effective strategy for clinical education and to improve quality for clinical practice of nursing education. This study is aimed to above goal by the report about nursing students' experience on emergency room environmental observation. The number of participants is 30 nursing students who are senior in the practicing at emergence room. Data analysis was centered on scrutinizing the contents of the participants' replies in order to deduce any relevant meaning. Also, data were analyzed by the meaning of learning based on self-examination through the practical learning. The positive and negative topics stated. Nursing students' experience on emergency room observation will supply the thinking about their own self-portrait in near future, and will give self reflection about correct nursing interventions to nursing students.

• Journal of the Korean Chemical Society
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• v.53 no.4
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• pp.453-465
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• 2009

In this study, the descriptions of salt solubility in the textbooks of secondary school and college were reviewed to figure out the reason of low understanding of elementary and secondary school students and teachers about the solubility of a salt in the presence of other ions. The ionic strength dependence of salt solubility was not introduced in the secondary school textbooks and general chemistry textbooks. It appeared in the physical chemistry textbooks as a direct or an indirect explanation. However, most of college senior students who had learned the physical chemistry could not relate the salt solubility with the ionic strength change. The factors might affect salt solubility, such as the ion pair formation and the activity coefficient change by ionic strength, were mentioned and an experimental result was also shown to resolve the questions that college students and teachers might have. Because these explanations are beyond the secondary school level, we need to develope an easier and better explanation suitable for the secondary school students.

• Journal of Science Education
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• v.39 no.2
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• pp.239-254
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• 2015

The aims of this research were to analyze and compare verbs in the contents of the 7th, 2007, and 2009 revised national curriculum for elementary and middle school science. After the investigation of 1383 verbs in description of achievement standards and inquiry, we found that 'to know'(15.0 %) in elementary school and 'to understand'(24.2 %) in middle school were the most frequently used ones, totally in these three curriculums. In the 7th national curriculum, frequently used verbs in elementary school were ones related with inquiry such as observation, investigation and so on though 'to understand' had the most common verbs. Secondly, 'to explain' ranked top among verbs in the 2007 revised national curriculum. It showed some possibility of influences of the discussion-oriented situation at that time. Finally, however, in 2009 revised national curriculum, 'to know' and 'to understand' occupied the first and second portion of the verb distribution. In addition, 'to understand' and 'to observe' were used evenly through three curriculums but the portions of 'to know' increased through curriculum revisions. Some implications and discussions were also added with suggestions for further researches.

• Spatial Information Research
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• v.16 no.4
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• pp.499-511
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• 2008

To solve the emerging geospatial problems, more creative and effective spatial information infrastructures are required. To solve the emerging geospatial problems at a national level, this study assumes that the current Korean NSDI considered descriptive needs to be more prescriptive. The future NSDI will require a more useful integration vehicle for matters and places of national importance such as national security and emergency prevention and management. The purpose of this study is to identify "What can be done for the Korean NSDI to be more prescriptive?" This study reviews previous researches and new SDI concepts, analyzes the Korean NSDI in terms of a descriptive NSDI, and proposes a prescriptive NSDI model for Korean geospatial problems. The model includes new aspects of an advanced NSDI and several tasks for the future prescriptive Korean NSDI.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.29 no.9
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• pp.693-700
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• 2018

In this paper, we propose a method to generate SAR(synthetic aperture radar) images for bistatic radar. The bistatic SAR can overcome several limitations of monostatic SAR, because the former can be applied to a variety of scenarios, compared to the latter. However, no study has been conducted on bistatic SAR imaging so far. In this paper, we propose a method to generate bistatic SAR images using the monostatic equivalent model and conventional monostatic SAR imaging algorithms. Simulations using airborne SAR in the bistatic geometry validated the efficacy of the proposed method.

• Education of Primary School Mathematics
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• v.19 no.2
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• pp.113-125
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• 2016

The concept and measuring activities of the height of figures are essential to find the areas or volumes of the corresponding figures. For plane figures, the height of a triangle is defined to be the line segment from a vertex that is perpendicular to the opposite side of the triangle, whereas the height of a parallelogram(trapezoid) is defined to be the distance between two parallel sides. For the solid figures, the height of a prism is defined to be the distance of two parallel bases, whereas the height of a pyramid is defined to be the perpendicular distance from the apex to the base. In addition, the height of a cone is defined to be the length of the line segment from the apex that is perpendicular to the base and the height of a cylinder is defined to be the length of the line segment that is perpendicular to two parallel bases. In this study, we discuss some pedagogical problems on the concepts and measuring activities of the height of figures to provide alternative activities and suggest their educational implications from a teaching and learning point of view.