• Journal of the Korean Society of Earth Science Education
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• v.14 no.2
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• pp.123-135
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• 2021

In this study, we apply a lesson design process using an argumentation structure to preservice earth science teachers and analyzed argumentation levels displayed in the lesson plans written by preservice teachers in the process. As a result of the study, the preservice teachers designed a logically structured lesson by reflecting more argumentation components in the final lesson plan than the first one. In addition, in the case of lesson topics in which all argumentation elements were not explicitly presented in textbooks or curriculum, preservice teachers could not clearly reflect some argumentation components in the lesson plan. The conclusions and implications based on the results are as follows: First, it is necessary to use the argumentation structure as a tool to design logical science lessons, considering that argumentation levels of lesson plans written by preservice science teachers were improved by using argumentation structures in instructional design. Next, it is necessary to cultivate the preservice science teacher's ability to reconstruct the curriculum for science lesson design using the argumentation structure since argumentation levels of lesson plans written by preservice science teachers were limited to the argumentation components presented in the textbook and curriculum. Additionally, it is necessary to develop and apply a preservice teacher education program that uses the argumentation structure in the context of actual teaching activities so that preservice science teachers can not only understand argumentation but also improve their class expertise.

• Journal of the Korean School Mathematics Society
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• v.23 no.1
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• pp.159-177
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• 2020

Education researchers have been continuously interested in the teacher's ability to design lessons and conducted various studies in order to improve the teacher's professionalism in determining the quality of school instruction. So, this study explored the change of instructional design through the lesson reflection of pre-service mathematics teachers who participated in practicum settings. As a result, in the lesson plan prepared by pre-service mathematics teachers, the motivation to induce learning in the introduction stage, to present the learning contents in the development stage, and to reconstruct the formative evaluation of the closing stage was the highest rate. And the categories of the reconstructed contents appeared intensively in terms of curriculum contents and teaching and learning methods. This result can be attributed to the lack of experience in designing and performing lessons by pre-service mathematics teachers, so it suggests that the opportunity to design and conduct classes that take into account the practical aspects of education should be provided in the preparation process for pre-service mathematics teachers.

• Proceedings of the Korean Society of Computer Information Conference
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• 2018.01a
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• pp.117-120
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• 2018

테크놀로지의 발달에 따라 Technological Pedagogical Content Knowledge(TPACK)의 중요성이 증가하고 있다. 이에 따라 김성원과 이영준(2017)은 TPACK에서 테크놀로지의 도구를 프로그래밍까지 확장한 TPACK-Programming(TPACK-P) 교육 모델을 제안하였다. 또한, TPACK-P 교육 모델을 기반으로 TPACK-P 교육 프로그램을 개발하였으며, 예비 교사에게 적용하여 효과를 검증하였다. 그 결과, 다른 영역의 지식 발달에는 효과적이지만, Technological Content Knowledge(TCK)와 Technological Knowledge(TK)에는 영향을 주지 못하였다. 본 연구는 TPACK-P 교육 프로그램이 모든 영역의 지식 발달에 효과적이도록 만들기 위해서 예비 교사를 대상으로 TPACK-P 교육 프로그램을 적용하고, TPACK-P 교육 프로그램에 대한 인식을 조사하였다. 그 결과, 예비 교사는 프로그래밍 학습, 교과와 교육과정에 맞는 프로그램 설계, 프로그램 제작 과정에서 어려움이 있는 것으로 나타났다. 또한, 이러한 어려움을 극복하기 위해서 프로그래밍 학습의 강화와 프로그래밍 수업 설계 예시의 탐색이 필요하다고 말하였다. 이러한 연구 결과를 통하여 TCK와 TK의 향상을 위하여 프로그래밍을 효과적으로 가르치기 위한 교육 방안과 예비 교사의 교과 내용과 프로그래밍의 연결을 촉진하기 위한 내용이 TPACK-P 교육 모델에 보완되어야 한다는 것을 확인할 수 있었다.

• Journal of the Korean Society of Propulsion Engineers
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• v.15 no.1
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• pp.83-89
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• 2011

A design plan was proposed for determining combustor configuration of regenerative- cooled liquid rocket engine in the process of preliminary design. Rocket performance and regenerative cooling results were calculated using the properties of combustion gas estimated in CEA. For required thrust, chamber pressure, atmosphere pressure and propellant mixture ratio the mass flow rate of propellants and combustor performance were predicted by one-dimensional and experimental correlations. Finally, determinable plan for the contour of combustor were presented through Rao nozzle design method.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2010.11a
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• pp.37-42
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• 2010

A design plan was proposed for determining combustor configuration of regenerative- cooled liquid rocket engine in the process of preliminary design. Rocket performance and regenerative cooling results were calculated using the properties of combustion gas estimated in CEA. For required thrust, chamber pressure, atmosphere pressure and propellant mixture ratio the mass flow rate of propellants and combustor performance were predicted using one-dimensional and experimental equations. Finally, determinable plan for contour of combustor were presented through Rao nozzle design method.

• Transactions of the Korean Society of Mechanical Engineers
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• v.14 no.5
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• pp.1356-1364
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• 1990

This paper deals with the preliminary design conditions of Stirling Engines based on an adiabatic analysis with regenerator effectiveness. The investigation of thermal regeneration process results that the definition of effectiveness proposed by Urieli et al. is appropriate for the present model. Then, it is applied to the already existing approximate analytic solution for the adiabatic model in order to optimize thermal efficiency as well as work parameter. Results show that thermal efficiency is less sensitive to the variation in design parameters than work. Phase angle for the maximum work is also the most efficient at high values of the effectiveness. Swept volume ratio should be chosen with care. The optimum value of dead volume ratio is at least less than the maximum efficiency condition. The feasible design range in compression ratio lies between the maximum efficiency condition and the structural limit of Stilring Engines, where the higher its value, the better. Changes in the temperature ratio do not alter the design conditions. Working fluids with the specific heat ratio 1.67 are more efficient that those with 1.4.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.12 no.1
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• pp.9-17
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• 1992

This paper represents the expert system for selecting the superstructure types of bridges in the part of a preliminary bridge design. The system is implemented with the expert system tool called K-CLIPS which uses the production system for knowledge representation and provides the mechanism of forward chaining. This expert system is composed of a knowledge base, data base and a knowledge module built by the tool which consists of the knowledges on design procedures. During symbolic processing the data base supports the sub system in knowledge base.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.15 no.4
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• pp.403-409
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• 2017

For dry storage of the spent nuclear fuel (SNF) stored in the storage pool of a nuclear power plant, essentially all moisture must be removed to prevent corrosion of the assembly and canister internals and/or degradation of fuel cladding integrity after SNF canister loading operation. R&D work is now in progress on a forced gas drying system that can be used to remove residual water in canisters. In this work, preliminary design is performed to manufacture the forced gas drying system. This process includes a case study of dry methods for canister moisture removal, relative codes and standards, confirmation of adequate dryness, needs analysis at plant sites, and characteristics of SNF stored in pools. Through this preliminary design work, we obtained a conceptual flow diagram and preliminary P&ID of the forced gas drying system. The results of this study can be used to determine details of the design to manufacture the forced gas drying system.

• Proceedings of the Korean Society of Computer Information Conference
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• 2016.01a
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• pp.161-164
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• 2016

컴퓨팅 사고력이나 프로그래밍 체험 및 교육 기회 부족 등으로 인한 자신감 결여와 같은 컴퓨터 학습에 대한 부정적인 태도는 다양한 전공의 예비교사들이 현장에서 소프트웨어를 융합한 교육을 시도하는데 장애요인이 될 수 있다. 안타깝게도 현재까지의 교사양성 교육에서는 ICT 소양 위주의 컴퓨터 교양 교육 외에는 컴퓨팅 사고력이나 소프트웨어 교육에 대해 체험할 수 있는 교육내용이 없는 것이 현실이다. 이에 본 연구에서는 이러한 문제에 대한 해결점을 찾아보고자, 예비교사의 교양 과정에 투입 가능한 컴퓨팅 사고력 기반의 웹 프로그래밍 수업 프로그램을 설계하여, 이를 컴퓨터교육 비전공 예비교사의 교육현장에 기존 ICT소양 위주의 수업내용과 비교하여 투입한 뒤, 수업을 통한 컴퓨터 학습태도의 변화 양상을 관찰하기 위한 기초연구를 수행하였다.

• 한국신재생에너지학회:학술대회논문집
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• 2010.11a
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• pp.86.1-86.1
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• 2010

예비개질기(Pre-reformer)는 중대형 내부개질형 용융탄산염 연료전지(MCFC) 시스템에서 다양한 연료를 사용하기 위한 필수적인 화학반응기이다. 예비개질기는 스택 전단에 설치함으로서 스택 내부의 열균형을 유지하고, 다양한 원료를 연료로 이용할 수 있도록 하며, 황화물로부터 후단의 개질촉매 및 전극촉매를 보호하여 주개질 반응의 부담을 감소시켜 MCFC 시스템의 내구성 향상의 중요한 역할을 한다. 본 연구는 예비개질 반응기 설계에 CFD 모델링을 적용하기에 앞서 파일롯 반응기 내 농도/ 온도 구배를 측정하고자 하는 목적으로 수행되었다. 반응가스로는 천연가스 내 고차탄화수소(C2 이상) 중 상대적으로 높은 농도를 가진 에탄을 이용하였고, MCFC용 예비개질기의 운전특성을 고려하여 비교적 낮은 온도와 높은 수증기/탄소 비에서 단열반응기로 실험을 진행하였다. 향후 본 실험결과를 이용하여 CFD 모델링에 대한 검증을 수행할 예정이며, 하수처리장부생가스(ADG)/ 매립지 가스(LFG)용 MCFC 시스템을 위한 예비개질기 설계에도 적용을 하고자 한다.