• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.46 no.9
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• pp.703-711
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• 2018

A preliminary design tool of a hypersonic Ludwieg tube facility which simulates real-flight environment was developed and its performance was verified by CFD(Computation Fluid Dynamics) calculations. The operating theory of Ludwieg tube was studied to develop the preliminary design tool. Using the preliminary design tool, Ludwieg tube specifications were determined to satisfy target performance. The Ludwieg tube which produces high speed flows(the Mach number ranging 4 to 10) was designed. Especially altitude simulation at Mach 4 flow could be performed.

• The Journal of the Korea Contents Association
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• v.21 no.4
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• pp.498-508
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• 2021

This study was to identify the concept of oppression in nursing organization thereby providing basic data on nursing education to improve oppression in nursing organization. Using Walker and Avant's criteria to identify attributes, antecedents, and consequences of oppression in nursing organization, 17 research articles published from 2006 to 2020 were reviewed. The defining attributes of oppression in nursing identified in this study were low self-esteem, lack of authority, and horizontal violence. The antecedents to oppression in nursing organization were oppressors, hierarchical organizational structure, and marginalization. The consequences of oppression in nursing organization included job satisfaction, organizational silence, patient safety and quality of nursing. Considering the findings, improvement of the hierarchical working environment in hospitals and self-awareness as professional nurses are important for nurses to overcome oppression in nursing organization. Therefore, effective educational programs should be developed to ameliorate working environment and self-awareness of nurses.

• Journal of the KSME
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• v.53 no.5
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• pp.45-50
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• 2013

인체장기칩(Human Organs-on-Chips)은 미세공학, 생체모방, 세포생물학 분야의 기술을 시너지 있게 접목하여 개발되는 신개념의 인체 대리모델이다. 이 글에서는, 이러한 생체모사 시스템의 개발 배경과 최근 연구동향, 그리고 잠재성에 대해서 살펴본다.

• Proceedings of the Korean Institute of Landscape Architecture Conference
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• 2003.10a
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• pp.51-54
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• 2003

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.32 no.7
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• pp.27-33
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• 2003

본고는 수송용 냉동차량의 신기술동향에 관한 것으로, 냉동차량의 시스템 개량, 대체냉매용 냉동차량의 개발, 진공 단열기술, 신개념의 냉동수송 기술동향 등을 소개한 것이다.

• Journal of the Korea Society of Computer and Information
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• v.25 no.3
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• pp.251-260
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• 2020

In this paper, we propose to understand the conceptual structure of programming elements that learners form during the prototyping theory. To do this, we reviewed previous studies on the meaning of conception and prototype theory and conducted a course of problem-solving programming for 33 university students who had no prior experience in programming, and collected transcription materials through conceptual metaphorical writing. The conclusions of this study are as follows: 1) Identifying the conceptual structure of learners as a conceptual metaphor can enhance the effectiveness of programming education. 2) Learners need to reinforce the experience of forming abstract attributes to form mature programming concepts. 3) The concept of programming differs in the structure of multi-level concepts that students, teachers, and professional programmers have in each group. 4) Programming elements should intentionally block misconception risks in the meaning of symbols. 5) Concept evaluation tools should be developed to check whether various attributes can be applied.

• Journal of Science Education
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• v.34 no.2
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• pp.237-245
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• 2010

The purpose of this study was to analyze hierarchy for high school students' concepts about genetics. The assessment of genetics related concept was conducted for 10th and 11th grade students and a hierarchy map was schematized based on the evaluation result using Knowledge State Analysis Method. Some differences were found when comparing the result of whole students' hierarchy with hierarchy on 7th national science education curriculum. In analyzing hierarchy by grade, concepts of highest and lowest level turned out same but some concepts of middle level changed. In case of analysis of hierarchy for concepts about genetics by score, as score was higher, the number of concept in lower level became larger and the relationship among concepts became more structurized. Following studies are required to develop specific teaching strategies for having effective genetics concept and conduct case study of applying the concept hierarchy through this method to class in the field.

• Journal of the Korean earth science society
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• v.24 no.3
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• pp.160-171
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• 2003

This study was designed to analyze the types of concepts about earth science related to seasonal changes, so as to develop a generative learning model focused on dissolving cognitive conflicts between the aforementioned concepts through debates and using said debates to find out how effectively the model works. There are 100 types of earth science concepts concering seasonal changes, 66 of which are unscientific in nature, including misconceptions. Through a second field trial and a research and development (R&D) process, a test on these concepts was developed, consisting of 14 items. For the experimental group, a four-phase generative learning strategy that reflects the types of earth science concepts and cognitive conflicts between such concepts was developed through pre-analysis and discussion, respectively. On the other hand, a traditional teaching and teaming strategy was used for the control group. A meaningful statistic gap found between the two groups through a covariance analysis, the significance level of which was 0.05. This result may be interpreted to mean that the generative teaming strategy is a possible alternative for correcting misconceptions about scientific concepts of seasonal changes.

• 한국HCI학회:학술대회논문집
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• 2007.02b
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• pp.105-111
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• 2007

본 연구는 신제품 개발 과정에서 이루어지는 개념 설계(conceptual design) 단계에서의 효과적인 평가 방법론 제안을 목적으로 한다. 특히, 현재 사용자가 경험하지 못한 미래형 제품설계를 위한 개념 설계 내용이, 사용자의 잠재적 요구사항을 반영하고 사용자가 수행해야 하는 과업을 효과적으로 지원할 수 있는 지의 여부를 평가하고자 한다. 본 연구에서 제안하는 디자인 컨셉 평가 프레임웍은 3단계로 구성되어 있다. Phase 1에서는 제품의 미래 사용환경을 예측한 시나리오를 작성하여 사용 사례를 도출하고 사용 사례에 대한 과업 분석을 수행, 사용자의 수행 과업을 파악한다. Phase 2에서는 이러한 사용자의 수행 과업을 지원하기 위해 필요한 기능적 요구사항을 구현할 수 있는 기술을 체계적으로 파악하여, 기술 지도(Technology Roadmap)로서 전개한다. 이를 통해 디자인 컨셉을 구현하기 위해 현재 활용 가능한 기술 대안을 파악한다. Phase 3에서는 기술 지도를 통해 파악한 현재의 요소 기술 및 미래의 기술 대안과 사용자 요구사항간의 연관관계를 분석, 제품 개념 설계에 반영되어야 할 설계 요구사항을 도출하여 평가항목을 구성한다. 본 연구의 디자인 컨셉 평가 방법은 CSCW(Computer Supported Cooperative Work)기반 시스템의 실감 사용자 인터페이스(tangible user interface) 개발 사례를 통해 검증하였다.

• Ecology and Resilient Infrastructure
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• v.3 no.2
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• pp.126-129
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• 2016

The risk of flooding and groundwater depletion is increasing due to the increase of impervious area in an urban area that reduces the volume of infiltration and increases the outflow of rainwater. The objective of this study is to examine the impact of installation of roadside tree protectors with infiltration pipes in terms of the change of the infiltration rate. Through this study, it has been attested that roadside tree protectors with infiltration pipes increased the infiltration rate and decreased water level on the ground, and could be applied in an urban area as the low impact development (LID) facilities.