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MoS2 화학반응성 열 증착법을 적용한 열처리 시간에 따른 박막 증착 연구
강승모,박현준,조휘영,장원태,이지은,이호연 순천향대학교 부설 산업기술연구소 2020 순천향 산업기술연구소논문집 Vol.26 No.1
Two-dimensional semiconductors are the most popular semiconductor materials these days. Because they have electronic mobility, high transparency, and high mechanical strength. they can be used as Thin Film Transistors (TFT) and sensors. Graphene with similar characteristics does not have an energy band gap and therefore cannot be expected to have effective switching characteristics for TFTs. On the other hand, Molybden Disulphide (MoS2) is seen as a next-generation semiconductor material since there is a band gap due to its electrical characteristics, transparency, and flexibility owing to its thin depth. Also, a sapphire board with hexagonal symmetry, such as a MoS2, improves the quality of a MoS2 over that of a quartz board. This study compared the symmetry and optical properties by depositing the sapphire using a chemical-reactive thermal deposition method that synthesizes the material at high temperatures. We also looked at the characteristics of deposition and heat treatment time. Using the thin film formed over time, absorbance was obtained using the data to measure the reflectivity and transmittance of the MoS2 to confirm that the thin film formed is the MoS2. Afterwards, the characteristics of the MoS2 deposited over time and 1000 degrees of heat treatment were observed by comparison and analysis. 4 hours of heat treatment was observed to improve the properties of MoS2. However, it was observed that in the heat treatment for 20 hours, the property of MoS2 was destroyed and returned to MoO3. Therefore, an appropriate heat treatment time is required to deposit MoS2 suitable for TFT characteristics. This expriment shows that there is a limit to MoS2 which can be improved by heat treatment time. If more detailed conditions can be sat in the future, it will be very helpful for integrating MoS2 into various semiconductors.
원추형 유동층 연소기 내의 열전달에 미치는 복원계수의 영향에 대한 수치해석 연구
강승모,박외철,Hamada Abdelmotalib,고동국,임익태 한국반도체디스플레이기술학회 2015 반도체디스플레이기술학회지 Vol.14 No.4
In this paper, numerical simulations on conical fluidized bed combustors were carried out to estimate the effect of coefficients of restitution between particle and particle and particle to wall on hydrodynamics and heat transfer. The Eulerian–Eulerian two-fluid model was used to simulate the hydrodynamics and heat transfer in a conical fluidized bed combustor. The solid phase properties were calculated by applying the kinetic theory of granular flow. Simulations results show that increasing the restitution coefficient between the particle and particle results in increasing the bed pressure drop. On other hand, the increasing of particle to wall coefficient of restitution results in decreasing the bed pressure drop. It is found that the coefficient of restitution has little effect on heat transfer.
과학탐구활동 관점에서의 특수교육 과학과 교과서 내용적합성 분석 연구
강승모,강성구 한국특수교육교과교육학회 2016 특수교육교과교육연구 Vol.9 No.3
According to special education curriculum (2011 revision), the purpose of this study is to help to develop the next science textbooks for the students with disabilities by analyzing and describing what content suitability is like. From the viewpoint of science inquiry activities, the contents of science textbooks of elementary, middle, and high school revised in 2011 are analyzed based on three analytical criteria : types, appropriateness, implementation difficulty. The results of this study are as follows: first, in the type of the science inquiry activity, 'observation' type shows the highest percentage of the basic inquiry process-functions. Second, in the aspect of appropriateness, the proportion of 'science concept' centered activities is higher than 'real life' one in the topic area, and in the safety aspect, the proportion of using dangerous materials is about 9% in the inquiry activity of middle and high schools curriculum. In terms of cost, the main activity is 'level of study preparation', but the activity requiring 'experimental tool level' and 'expensive equipment level' also show a large proportion of 48.9%. Lastly, in the implementation difficulty area, the preparation time and the implementation time are appropriately structured, but in the instructional step, the proportion of complex activity is about 30%. The implications are as follows. First, the type, the appropriateness, and the implementation difficulty of scientific inquiry activities should be developed in accordance with the characteristics of students with disabilities. Second, school science facilities and experimental tools should be equipped so that students with disabilities can safely conduct scientific inquiry activities. Third, it is necessary to develop an analysis framework for systematic analysis of the science textbook learning activities. 이 연구는 2011년 특수교육 기본교육과정 개정에 따라 변화된 초·중·고등학교 과학과 교과서에 수록된 교과내용을 과학탐구활동 관점에서 내용적합성이 어떠한지를 분석·기술함으로써 향후 장애학생을 위한 과학과 교과서 개발에 도움을 주고자 하는데 그 목적이 있다. 과학탐구활동의 유형, 적절성, 실행난이도 3가지 분석기준을 통해 2011년 개정 초·중·고등학교의 과학과 교과서를 대상으로 분석하였다. 연구결과는 첫째, 과학탐구활동의 유형에서 기초탐구기능 중 ‘관찰’ 유형 비율이 가장 높게 나타났다. 둘째, 과학탐구활동의 적절성 중 주제 면에서 ‘생활관련 중심’보다 ‘과학개념 중심’ 활동의 비율이 더 높았고, 안전 면에서는 중·고등학교에서 위험물질을 사용하는 비율이 약 9%로 나타났다. 그리고 비용 면에서는 전반적으로 ‘학습준비물 수준’ 활동이 주를 이루지만, ‘실험도구 수준’과 ‘고가의 장비수준’이 필요한 활동도 48.9%로 적지 않은 비중으로 나타났다. 마지막으로 실행난이도에서는 비교적 준비시간, 실행시간은 적절하게 구성되어 있으나, 수업단계에서는 복잡한 활동도 약 30%로 나타났다. 이를 통한 시사점은 다음과 같다. 첫째, 과학탐구활동의 유형, 적절성, 교사의 실행난이도 등을 고려하여 장애학생의 특성에 맞는 적절한 과학탐구활동이 개발되어야 한다. 둘째, 안전하게 장애학생이 과학탐구활동을 실시할 수 있도록 학교 과학시설과 실험도구를 갖추어야 한다. 셋째, 교과서의 체계적인 개발을 위한 교과 내용의 분석 틀 개발이 필요하다.