• 한국산업보건학회지
• /
• 제22권4호
• /
• pp.276-283
• /
• 2012

Objectives: This study was conducted to survey the viewpoints on the material safety data sheets(MSDS) training for safety and health managers(SHMs) and workers. Subjects and Methods: A surveillance was made using a self-reported questionnaire for 78 SHMs and 122 workers to survey their viewpoints on the MSDS training. Survey results were analyzed using the SPSS program(Version 12.0 SPSS Inc., USA). Results: The result of the study shows that there are contrasts with the cognition of SHMs' and workers' on the education of MSDS and the program preference for education efficiency of MSDS. Workers were significantly more interested in the MSDS education than the SHMs did. Workers preferred the education program which is easily to be understood, to voluntarily participate on MSDS education, but SHMs did the quiz program. Also we found that the SHMs wanted to learn the education program via the expert(37.3%) rather than education resources(33.3%) which were served by government or relevant agency. In contrast, workers wanted the audio-visual education program, which is mainly consisted of accident cases (33.3%), rather than periodical education program(22.1%). Conclusions: This study showed that effectiveness of MSDS education was associated with the program served by company, and the education program for the voluntary participation of the workers should be made practical and attractive.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2005년도 추계학술대회 논문집 Vol.18
• /
• pp.342-343
• /
• 2005

지식기반사회에 있어서는 종래부터 사용되어 오던 직업교육의 개념 설정과 교육의 방향이 바뀌어야 한다. 이 연구에서는 직업교육, 기술교육, 진로교육, 전문교육, 공학교육 등의 의미를 살펴보고, 전문대학과 대학 수준에서의 직업교육에 관한 교육과정을 살펴본 후, 그 개선점과 나아갈 방향에 대한 탐색을 하였다 이 논문에서 사용한 연구 방법으로는 자료 분석에 의한 문헌 연구(literature research) 방법이다.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2006년도 하계학술대회 논문집 Vol.7
• /
• pp.305-306
• /
• 2006

자동차의 난방 열원은 HVAC(Heating, Ventilating & Air Conditioning)에 내장되어 있는 히터코어 (Heater Core) 에서 공급하게 되며, 이 히터코어는 엔진에서 가열된 냉각수 열원을 이용하게 된다. 그러나 최근 디젤 엔진의 경우 연소효율의 개선과 CEGR(Cooled Exhaust Gas Recirculation) 시스템의 적용으로 냉각부하가 증가하여 냉각수가 가지는 가용 열원이 기종보다 약 30~40% 정도 저하되고 있다. 따라서 디젤 자동차 및 하이브리드용 자동차의 난방 보조 히터의 국산화 개발이 시급해진 상황이며 초정밀, 고효율 보조 히터의 개발이 요구되고 있다. 현재 적용되고 있는 보조 히터 중에서 PTC 히터는 PTC 소자의 발열을 이용하여 공기를 직접 가열하기 때문에 추가적인 연료소비가 없고 소형 및 저가라는 장점이 있다. PTC 세라믹 소자는 $BaTiO_3$를 모체로 하며, 이의 특성 항상 및 제어를 위해서는 적절한 dopant를 선택하여 균일하게 doping 해야 한다. 지금까지 dopant에 따른 구성 요소 및 역할은 비교적 잘 알려져 있다. 하지만, 자동차용으로 사용되기 위해서는 12V의 저전압에서 동작해야 하며, 또한 소자의 두께가 얇아지게 됨에 따라서 발생하는 전기적 short와 같은 문제점들을 해결하여야 한다. 따라서 본 연구에서는 PTC 세라믹 소자에서 도펀트 종류와 양 조절을 통한 저저항을 확보하고, PTC 세라믹 소자의 박막화를 달성하고자 하였다.

• 한국융합학회논문지
• /
• 제9권5호
• /
• pp.113-119
• /
• 2018

본 연구는 3D 프린터를 활용한 교구개발 프로그램이 예비유아특수교사의 보편적 학습설계 인식에 미치는 효과를 검증하기 위해 시행하였다. 연구대상은 3D 프린터를 활용한 교구개발 프로그램에 참가한 예비유아특수교사 30명이었으며, 보편적 학습설계에 대한 설문을 중재프로그램 적용 전과 후에 실시하여 비교하였다. 연구결과 예비특수교사들은 3D 프린터를 활용한 교구 개발 프로그램을 통해 보편적 학습설계의 4개 하위영역 수준에서 유의미한 차이를 보였다. 이는 보편적 학습 설계 인식 향상을 위해 3D 프린터를 이용한 직접적 교구개발 경험이 매우 효과적이라는 것을 나타낸다. 또한 예비유아교사에게 교구개발 경험은 수업설계 능력 향상을 위해 중요하며, 그들에게 다양한 요구를 지닌 학생 지도를 위하여 최신 기술을 활용한 교구개발 실습이 필요함을 논의하였다.

• 한국수학교육학회지시리즈A:수학교육
• /
• 제52권3호
• /
• pp.335-361
• /
• 2013

The purpose of this study is to analyze effects on storytelling materials of statistics in the middle school classroom lesson. For this purpose, a story is developed by the Zazkis & Liljedahl's model and applied to the 7th graders of 4 classes in a middle school. After the comparison between 5 hours of storytelling lessons and ordinary lessons, the following research findings are obtained. First, storytelling material brings a positive effect on student's academic achievement. It is also shown by the qualitative analysis that this result was caused by cognition of data observation, data transformation, and unification of data with context. Second, storytelling material brings a positive effect on student's affective attitude. It is also validated by the qualitative analysis that students show the positive change in mathematical value cognition and the interests in the lesson.

• Current Optics and Photonics
• /
• 제1권6호
• /
• pp.649-654
• /
• 2017

In this communication, we present an expression to determine thermal lensing in isotropic materials. The heat equation is analytically solved when a Gaussian spatial laser beam profile is introduced to a cylindrical geometry of optics using a complete set of Bessel functions. This expression permits explicit calculation of variation of focal length induced by thermal lensing and allows thermal effects for various material parameters on the optics. We applied our model to a high absorption material (Ti:sapphire) and also transparent material (thallium garnet or TGG) and found that the thermal lensing can be reduced more than 4 times by adjusting the laser beam waist and optics dimensions. Our analysis is completely general and applicable to any optical system.

• Journal of Korean Neurosurgical Society
• /
• 제52권5호
• /
• pp.498-500
• /
• 2012

Cranioplasty is performed using autograft and allograft materials on patients to whom craniectomy was applied previously due to the facts that, this region is open to trauma and the scalp makes irritation and pressure onto the brain paranchyma causing brain atrophy and convulsions. Dramatical improvement of neurological deficits, control of convulsions and partial prevention of cerebral atrophy are achieved after these operations. One of the most important complications of cranioplasty is late infection. Here, we report a 43-year-old male patient admitted with the history of purulant discharge from the right temporal incission site for one year to whom cranioplasty had been performed with allograft material 20 days after craniectomy which had been performed in 1989. Allograft cranioplasty material was removed and cranioplasty was performed using new allograft material with the diagnosis of late cranioplasty infection.

• 공학교육연구
• /
• 제15권5호
• /
• pp.140-150
• /
• 2012

The purpose of this study was to compare and analysis researches related the promising career and job outlook and to provide the direction for job choice to engineering students. Literature review and expert council were used to achieve the objectives of study. The result of this study was analyzed that these jobs were promising, that is, environmental scientist and specialist, earth scientist and hydrologist(education and research related career), architecture and architectural engineer, civil engineer, landscape technician, land surveyor map production expert photo surveyor surveying technician(construction related career), material engineer (mechanics and material related career), mine and geology engineer(chemistry, fiber and environment related career), computer system design and analyst, system software engineer, application software engineer, web specialist, and computer support specialist (electrical and telecommunication related career) and food engineer(food related career). In addition, health silver specialist, bio biomedical engineer, renewable energy specialist etc. were promising by considering social and economic trend for demographic change like aging and green growth.

• 교육시설
• /
• 제5권3호
• /
• pp.107-115
• /
• 1998

Open education is more relevant to the current educational reality which requires the liberalization, individualization and creativeness, and the effectiveness of open education will be maximized with the full utilization of instructional media. As well known, there are many different types of instructional media to promote open education such as print material, audio material, still picture, movie, computer, and multimedia. The main criteria to choose effective instructional media for open education depend upon easiness of supply and retrieval of information, and promotion of more frequent interaction among participants. In addition, utilization method, cost, curriculum contents, as well as school culture are also elements to consider in the selection of right instructional media.

• 농촌지도와개발
• /
• 제19권2호
• /
• pp.273-299
• /
• 2012

This study examined importance and performance of urban agriculture education program of the trainees who attended urban agriculture education, and suggested reformation of urban agriculture instructor course of Gyeonggi Provincial Agricultural Research & Extension Services by IPA models. The investigation was done on October 7, 2011. The subject was 40 trainees of urban agriculture instructor course of Gyeonggi Provincial Agricultural Research & Extension Services. The study suggested reformation of urban agriculture education program based on the findings as follow: Firstly, the instructors should teach trainees not theoretically but practically to let the trainees make use of learning at urban agriculture. Secondly, teaching material that is not theoretically but practical enough to apply it to actual urban agriculture should be supplied. Thirdly, urban agriculture education should be done not theoretically but practically considering its characteristics. Theoretical contents have been already included in teaching material, and practice oriented education should be done to let trainees put theory into practice on-the-spot. Practice oriented education should be supported in the planning future education. In addition future urban agriculture education program should consider importance as well as practice of educational contents, lecturers, operations and facilities.