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Jisung Yoo,Won‑Mi Choi,Byeong‑Joo Lee,Gi‑Yong Kim,Hyungjun Kim,Won‑Doo Choi,Yong‑Jun Oh,Sunghak Lee 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.10
In order to increase the exhaust-gas temperature of austenitic stainless cast steels used for turbo-charger-housings up to1050 °C, the more excellent high-temperature strength should be obtained because it works for keeping a sustainability ofthe housing shape. Three austenitic stainless cast steels were fabricated in this study by adding Nb into the Ni/Mn-replacedconventional ASTM HK40 steel, and their high-temperature strength was investigated in relation with the carbide formationand matrix strengthening. The 1-wt%-Nb-added steel showed the enhancement in high-temperature strength over thenon-Nb-added steel. This indicated that the Nb addition was effective on the strength improvement because it raised boththe fraction of thermally-stable hard MC-type carbides and the austenite-matrix hardness. However, the 1.5-wt%-Nb-addedsteel showed the lower high-temperature strength than the 1-wt%-Nb-added steel, although it contained the more MC carbides. The more MC carbides reduced the matrix hardness, enlarged the hardness difference between carbides and matrix,and deteriorated the high-temperature strength. Our results demonstrate that the strengthened matrix as well as populatedcarbides due to the Nb addition are desirable for further improving the high-temperature strength.
Jisung Yoo,Won‑Mi Choi,Seok Su Sohn,Byeong‑Joo Lee,Gi‑Yong Kim,Hyungjun Kim,Won‑Doo Choi,Yong‑Jun Oh,Sunghak Lee 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.2
For maintaining high-performance turbo-charger housings at higher exhaust-gas temperatures, e.g., 1050 °C, a high-Ni(20 wt%)-containing austenitic steel (ASTM HK40 steel) has been actively modified. As a promising method, the solidsolutionhardening obtained from the V or Cu addition was utilized in this study. Five austenitic cast steels were made byadding V or Cu in the modified HK40 steel (N16 steel; 4%-Ni replacement by 4.6%-Mn), and the high-temperature propertyimprovement was explained by detailed microstructural evolutions coupled with thermodynamically calculated phase diagrams. The V- or Cu-added steels showed improvements in high-temperature properties over the N16 steel because the additionof V or Cu raised both austenite matrix hardness and volume fraction of M7C3carbide. Considering that only 3.6–4.8vol% of M7C3was present in the five austenitic cast steels, the strengths were affected more by the matrix hardness. Whenthe V or Cu content was quite high, however, the ferrite or Cu-coring is formed, thereby leading to the serious deteriorationof high-temperature properties. The V- or Cu-added steels within proper contents are applicable well to automotive turbochargerhousings requiring or emphasizing high-temperature tensile properties.
Regional Linear Warping for Image Stitching with Dominant Edge Extraction
( Jisung Yoo ),( Sung Soo Hwang ),( Seong Dae Kim ),( Myung Seok Ki ),( Jihun Cha ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.10
Image stitching techniques produce an image with a wide field-of-view by aligning multiple images with a narrow field-of-view. While conventional algorithms successfully stitch images with a small parallax, structure misalignment may occur when input images contain a large parallax. This paper presents an image stitching algorithm that aligns images with a large parallax by regional linear warping. To this end, input images are first approximated as multiple planar surfaces, and different linear warping is applied to each planar surface. For approximating input images as multiple planar surfaces, the concept of dominant edges is introduced. Dominant edges are defined as conspicuous edges of lines in input images, and extracted dominant edges identify the boundaries of each planar surface. Dominant edge extraction is conducted by detecting distinct changes of local characteristics around strong edge pixels. Experimental results show that the proposed algorithm successfully stitches images with a large parallax without structure misalignment.
유지성(Jisung Yoo),엄문영(Moonyoung Eom) 한국교육정치학회 2023 한국교육정치학회 학술대회논문집 Vol.2023 No.-
The purpose of this study is to analyze various conflict patterns that occur in school settings and the influencing factors of relational conflicts within and outside of school through quantitative data, and based on this, to make suggestions to resolve conflicts in school settings. To this end, panel and cross-sectional regression analysis was attempted on the Teacher Longitudinal Study 2020 data, and through result analysis, suggestions were made for conflict management in the current school field. Research results show that school principal leadership, work burden, homeroom teacher status, teacher enthusiasm, teacher efficacy, teacher burnout, relationships with members, student deviance, job satisfaction, etc. have a statistically significant impact on the work and relationship conflicts felt by teachers at school waere found to have an effect. Based on the research results, this study sought to provide policy implications. Specifically, the need to introduce the conflict management system to manage conflicts, the establishment of government-level standards for division of work, the operation of a policy council in which both teachers and administrators participate to create a good school climate, and expanding education and training opportunities for school principals to mange conflict, and to expand opportunities for members to participate in the decision-making process were suggested. 본 연구의 목적은 학교 현장에서 발생하고 있는 다양한 갈등 양상과 학교 내·외 관계적 갈등의 영향 요인을 양적 데이터를 통해 분석하고, 이를 토대로 학교 현장에서의 갈등을 해소하기 위한 제언을 하는 데 있다. 이를 위해 교원종단연구 2020 데이터를 다중회귀분석 방법을 이용하여 분석하고, 분석된 결과를 통해 학교 현장의 갈등 관리에 대한 제언을 하고자 하였다. 연구 결과, 학교장리더십, 업무부담감, 담임 여부, 교사 열의, 교사효능감, 교사 소진, 구성원과의 관계, 학생 일탈, 직무만족도 등이 학교 현장에서 교사들이 느끼는 업무 갈등과 관계 갈등에 통계적으로 유의미하게 영향을 미치는 것으로 나타났다. 본 연구의 분석 결과를 통해, 학교 현장의 갈등 양상의 원인과 제도적 대처에 대한 방안에 대한 정책적 함의를 제공하고자 하였다. 구체적으로 갈등을 관리하기 위한 갈등관리시스템 도입의 필요성, 업무 경감을 위한 명확한 직무분석, 업무분장에 대한 정부 차원의 표준안 마련, 좋은 학교 풍토 조성을 위한 교원과 행정직원 모두가 참여하는 정책협의체 운영, 학교장의 갈등관리를 위한 교육 및 연수 기회 확대, 학교의 의사결정과정에서 구성원들의 참여 기회 확대 등을 제언하였다.
유지성(Yoo, Jisung),엄문영(Eom, Moonyoung) 한국비교교육학회 2021 比較敎育硏究 Vol.31 No.5
[연구목적] 효과적인 교원 평가 시스템의 개발은 교사의 질 향상과 함께 학업성취도를 향상시키는 수단이다. 이를 위해 본 연구는 미국의 교원 평가 시스템의 11가지 구성 요소(components)가 학업성취도에 미치는 영향을 분석하였다. 또한, 분석 결과를 바탕으로 우리나라 교원평가제도 개선을 위한 시사점과 시사점을 제공하고자 한다. [연구방법] 이를 위하여 미국 교사 질 향상을 위한 국가 위원회 (NCTQ: National Council on teacher Quality)에서 제공하는 50개 주의 교원평가 구성요소와 학업성취 데이터(SAT, ACT, NAEP)를 이용하였고, 다중회귀분석방법을 통해서 교원평가 구성요소와 학업성취와의 통계적 유의미한 관계가 있는지를 분석하였다. [연구결과] 이 연구의 주요 결과는 교원평가 11개 요소와 학업성취도간 인과관계가 학업성취도 종류에 따라 복합적으로 나타나며 각 주마다, 그리고 학업성취평가 방식에 대해서 그 영향력이 다양하다는 것을 알 수 있다. 특히, 1) 정년 결정(tenure decisions)은 SAT 점수 향상에 긍정적인 영향을 미치는 것으로 나타난 점, 2) 교사의 강의 실력(reporting teacher effectiveness)는 ACT 점수의 향상에 긍정적인 영향을 미쳤다는 점, 3) 성과급 차등지급(merit pay)은 ACT와 NAEP 점수 향상에 부정적 영향을 미치는 것으로 나타났다는 점은 흥미로운 결과이다. [결론] 본 연구는 효과적인 교원 평가 방식이 어떻게 학업성취도에 영향을 미치는지에 대해서 설명하였고, 각 주마다, 학업성취 평가 방식에 따라 다양하게 영향을 미친다는 점에서 한국에서도 한국의 특수성을 고려한 평가방식에 대한 고찰이 필요할 것이다.
Public Deliberation on Nuclear Energy Policy in Korea: The Impact of Trust in Information Providers
유지성(Jisung Yoo) 한국비교정부학회 2021 한국비교정부학보 Vol.25 No.2
(Purpose) Deliberative democracy allows citizens to participate in informed discussions to build consensus leading to conflict resolution and/or optimal policymaking, thereby ensuring a more democratic system. This paper presents an overview of deliberative decision-making for energy policy, focusing on the impact of participants’ trust in information sources. (Design/methodology/approach) Examined in this study is the 2017 public deliberation in Korea tasked with deciding whether to resume or discontinue construction of two Shin-Gori nuclear reactors. Logistic regression analysis was performed to examine the results of four surveys conducted over the course of the deliberation process with the purpose of investigating the impact of trust in information providers on participants’ opinions and final decisions. (Findings) The results indicated that participants who trusted information from nuclear experts and nuclear power operators tended to support resumption of reactor construction, while those who trusted information from government, civic groups, and Internet sources tended to support suspension of construction. (Research implications or Originality) Implication for energy policymakers is that sound, safe, reliable nuclear energy policy enacted with the support of citizens can be achieved through designing an effective process of providing reliable information on all sides of the policy issue and engaging an informed representative group of citizens in decision making.