FLUENT를 이용한 천음속 터빈익렬 유동장의 수치 시뮬레이션

정향남,정희택 경상대학교 생산기술연구소 2003 工學硏究院論文集 Vol.19 No.-

Numerical simulation of viscous compressible flow in turbomachinery cascade involves many problems due to the complex geometry of blade and flow phenomena. In the present study, numerical investigations have been performed to examine the transonic flow characteristics inside the turbine cascades. Commercial code? FLUENT was used to solve the compressible Navier-Stokes equations with the standard k- ε turbulence model. Multi-block H-type grids were applied to the high-turning transonic turbine rotor blades. Numerical results of three-dimensional analysis on the mid span have been compared with the experimental data and the numerical results of two-dimensional analysis. In addition, the three dimensional flow characteristics near the endwall have been analyzed to show the feasibility of the present flow solver as the numerical simulator.

익렬유동의 수치해석에서의 복합 정렬-비정렬 격자계의 적용 연구

정향남,정희택 慶尙大學校 經營行政大學院 2004 工學硏究院論文集 Vol.20 No.-

Numerical simulation has been performed to examine the effects of the computational grids on the prediction of the flow characteristics inside the transonic turbine cascades. Three kinds of computational grids are applied to the high-turning transonic turbine rotor blades and are compared in the sense of stability and accuracy. In addition, the grid adaptation has been tried in order to improve the prediction of the blade performance.

익렬유동의 수치해석에서의 복합 정렬-비정렬 격자계의 적용 연구

정향남(H. N. Jung),정희택(H. T. Chung) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-

Numerical simulation has been performed to examine the effects of the computational grids on the prediction of the flow characteristics inside the transonic turbine cascades. Three kinds of computational grids are applied to the high-turning transonic turbine rotor blades and are compared in the sense of stability and accuracy. In addition, the grid adaptation has been tried in order to improve the prediction of the blade performance.

MEMS 부품을 위한 다결정 박막의 탄성 물성치 추출 시스템의 매개변수의 영향

정향남(H. N. Jung),최재환(J. H. Choi),정희택(H. T. Chung),이준기(J. K. Lee) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월

A numerical system to extract effective elastic properties of polycrystalline thin-films for MEMS devices is already developed. In this system, the statistical model based on lattice system is used for modeling the microstructure evolution simulation and the key kinetics parameters of given micrograph, grain distributions and deposition process can be extracted by inverse method proposed in the system. In this work, the effects of kinetics parameters on the extraction of effective elastic properties of polycrystalline thin-films are studied by using statistical method. The effects of the fraction of the potential site( P<SUB>f</SUB>) and the nucleation probability( N<SUB>p</SUB>) among the parameters for deposition process of microstructure on the extraction of effective elastic properties of polycrystalline thin-films are studied.

MEMS 부품을 위한 다결정 박막의 탄성 물성치 추출 시스템과 적용

정향남(Hyang Nam Jung),최재환(Jae Hwan Choi),정희택(Hee Taeg Chung),이준기(June Key Lee) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.12

어린이지리교육학 연구 경향 분석

남상준 ( Sang-Joon Nam ),장혜정 ( Hye-Jeong Jang ),나정향 ( Jung-Hyang Na ) 한국지리환경교육학회 2022 한국지리환경교육학회지 Vol.30 No.4

Children’s-geographies-Education (CGE) is an educational trend formed in the 1990s by combining Children’s Geographies, child anthropology, and learning-ism. In Korea. Discussions on CGE began in earnest in the early 2000s. The purpose of this study is to analyze the research trend of CGE conducted in Korea from 2004-2021. Furthermore, based on this, I would like to discuss the development tasks of CGE. First of all, 135 master's, doctorate papers, and academic papers that satisfy the criteria were selected from thesis search portals and online libraries. By analyzing these papers, the following research results were obtained. First, the number of papers produced tended to increase over the entire period. In particular, 2008 was an inflection point for the increasing trend. This is judged to be the influence of the introduction of the 2007 curriculum. Second, research is concentrated in the Learner category and the Class category. This may be because the two categories are the main bodies of CGE. Third, Korea National University of Education and Seoul National University of Education are the centers of thesis production. The former is specialized in the subject of children's place experience, and the latter is the study of the implementation of geography classes. Fourth, most of the academic papers were published in the Journal of the Korean Association of Geographic and Environmental Education. This is due to the authority of the journal and interest in the field of primary geography education (PGE). Fifth, two research flows appear. First, it is to study children’s geographical perception and thinking as an approach to the subject or issue of PGE. Very few research papers belong to this flow. Another flow is research to understand the geographical life of children itself. Furthermore, I would like to explore the implications of it on PGE. Most of the research belongs to this flow. In light of the development model of subject, Korea's CGE is at an early stage. CGE is a direction for the paradigm shift of PGE research in Korea. It is expected that the meaning of CGE in PGE research will be widely shared.

초등학생들의 자연재해에 대한 인식의 지리교육적 의미

나정향,남상준 한국지리환경교육학회 2019 한국지리환경교육학회지 Vol.27 No.3

This study examined how children experience and perceive natural disasters in everyday life, and confirmed the characteristics and meaning of their perception of natural disasters. In addition, this study examined the implications of this perception of natural disasters for elementary geography education. Based on the results of the study, the meaning of elementary students’ perception of natural disasters in geography education is as follows. First, geography education should include the actual natural disaster experiences of children as its education contents, reflecting the scope of life closest to the children’s everyday life. Second, the education contents of geography education should revolve around geographical phenomena that can be directly understood by children considering the psychological hierarchy of their learning contents. The education contents should also be based on the problems and experiences of everyday life children are interested in and attracted to. Third, practical environment education should be provided based on the children’s perception of natural disasters, allowing them to learn about these disasters and naturally inducing their interest in solutions to environmental problems and protection. Fourth, safety and prevention education should be provided considering the children’s life experience and characteristics of geography education, so that they can independently make decisions and respond to natural disasters in real life. 본 연구는 어린이들이 일상생활에서 자연재해를 어떻게 경험하며 인식하고 있는지 알아보고, 어린이들의자연재해에 대한 인식의 특성과 의의가 무엇인지 파악하였다. 그리고 이러한 자연재해에 대한 인식 특성이 초등지리교육에 어떤 시사점을 주는지 알아보았다. 본 연구를 바탕으로 도출한 초등학생들의 자연재해에 대한 인식이 주는 지리교육적 의미는 다음과 같다. 첫째, 어린이들의 일상경험과 가까운 생활세계를 반영하여 어린이들이 실제 경험하는 자연재해를 지리교육의교육 내용으로 삼아야 한다. 둘째, 어린이들이 가지고 있는 학습 내용의 심리적 위계를 고려하여 직관적으로 이해할 수 있는 지리적인 현상을 중심으로, 그들의 관심과 흥미에 맞는 일상생활에서 부딪히는 문제와 경험을 바탕으로 하여 지리교육의 교육 내용을 조직해야 한다. 셋째, 어린이들의 자연재해 인식을 바탕으로 하여 자연재해에대해 학습하면서 자연스럽게 환경문제 해결과 환경보호에 관심을 가질 수 있도록 실제적인 환경교육이 이루어져야 한다. 넷째, 어린이들의 생활 경험과 지리교육의 특성을 고려하여 실제 자연재해가 발생했을 때, 어린이들이 스스로 상황을 판단하고 행동할 수 있는 대처 능력을 기르는 안전·방재교육이 이루어져야 한다.

초등학생들의 자연재해에 대한 인식

나정향,남상준 한국환경교육학회 2018 한국환경교육학회 학술대회 자료집 Vol.2018 No.12

천음속 터빈 익렬유동의 수치해석에서의 계산격자점 영향

정희택(H.T. Chung),정향남(H.N. Jung) 한국전산유체공학회 2005 한국전산유체공학회지 Vol.10 No.2

Numerical investigations have been performed to examine the effects of the computational grids on the prediction of the flow characteristics inside the turbine cascades. Three kinds of grid system based on H-type grid are applied to the high-turning transonic turbine rotor blades and comparisons with the experimental data and the numerical results of each grid structure have been done. In addition, the grid sensitivity on the estimation of the blade performances has been investigated.

천음속 터빈 익렬유동의 수치해석에서의 계산격자점 영향

정희택(H.T. Chung),정향남(H.N. Jung),서영수(Y.S. Seo) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11

Numerical investigations have been performed to examine the effects of the computational grids on<br/> the prediction of the flow characteristics inside the turbine cascades. Three kinds of grid system based<br/> on H-type grid are applied to the high-turning transonic turbine rotor blades and comparisons with the<br/> experimental data and the numerical results of each grid structure have been done. In addition, the grid<br/> sensitivity on the estimation of the blade performances has been investigated.