질산산화법을 이용한 SiO₂/Si 구조의 계면결함 제거

최재영,김도연,김우병,Choi, Jaeyoung,Kim, Doyeon,Kim, Woo-Byoung 한국재료학회 2018 한국재료학회지 Vol.28 No.2

5 nm-thick $SiO_2$ layers formed by plasma-enhanced chemical vapor deposition (PECVD) are densified to improve the electrical and interface properties by using nitric acid oxidation of Si (NAOS) method at a low temperature of $121^{\circ}C$. The physical and electrical properties are clearly investigated according to NAOS times and post-metallization annealing (PMA) at $250^{\circ}C$ for 10 min in 5 vol% hydrogen atmosphere. The leakage current density is significantly decreased about three orders of magnitude from $3.110{\times}10^{-5}A/cm^2$ after NAOS 5 hours with PMA treatment, although the $SiO_2$ layers are not changed. These dramatically decreases of leakage current density are resulted from improvement of the interface properties. Concentration of suboxide species ($Si^{1+}$, $Si^{2+}$ and $Si^{3+}$) in $SiO_x$ transition layers as well as the interface state density ($D_{it}$) in $SiO_2/Si$ interface region are critically decreased about 1/3 and one order of magnitude, respectively. The decrease in leakage current density is attributed to improvement of interface properties though chemical method of NAOS with PMA treatment which can perform the oxidation and remove the OH species and dangling bond.

IT 투자 정당화 요인에 관한 연구

최재영,Choi, Jaeyoung 디지털산업정보학회 2015 디지털산업정보학회논문지 Vol.11 No.4

Although actual business environment is getting difficult and hard, IT companies tend to shy away from of annual investment. Many firms have already reached the 25 percent level. However, the profit and the result of their annual investment needs to be evaluated objectively. IT investment analysis usually proceeds by comparing benefits and costs of an IT investment. Much of the problem derives from the historical treatment of IT as an overhead expense rather than a capital asset. What is most worrying about the current situation is the pressure to take a very short-term view of IT. Therefore, this research aims to analyses and justify the necessity of Visionary IT Investment. For this, it is crucial to identify the factors, which affect positively Visionary IT Investment and understand the role of CIO and explain the result of Visionary IT Investment, which is differed to related business and by different business environment. As a result of this study, the legitimacy of IT Investment is proved through analyzing the business value of not investing and cost-avoidance strategies.

폴리실라잔계 실란트를 이용한 정전척 실링특성 향상 연구

최재영(Jaeyoung Choi),박현수(Hyunsu Park),손민규(Min Kyu Son),정창오(Chang-oh Jeong),김우병(Woo-Byoung Kim) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.6

We have analyzed chemical properties of polysiloxane and polysilazane films, respectively, as sealing materials for electrostatic chuck (ESC) and have investigated the possibility of polysilazane as an alternative sealant to polysiloxane. It has been revealed that Si-O with organic bonding (Si-CH₃) existed in polysiloxane films compared to only pure Si-O bonding in polysilazane films. The sealing property of polysilazane has been found outstanding even in a short time of application. In the polysiloxane films containing H₂O, pin holes have been found possibly due to CO₂ gas evolution, and low adhesion with Si substrate has been observed after heat stress test in connection with the existence of organic bonding. After acid resistance test in 0.5 vol.% HF, 68 wt.% HNO₃, and 37 wt.% HCl solution, polyilazane films have shown a longer survival times. Compared to the conventional polysiloxane sealant, polysilazane is expected as a new sealing material because of good thermal and chemical stability.

중·고 역사 교육과정과 교과서의 동양사 내용 체계 분석

崔宰榮(Choi Jaeyoung) 역사교육연구회 2018 역사교육 Vol.147 No.-

This paper analyzes the systemization of content elements reflected in History National Curriculum and textbooks focusing on 2011 History National Curriculum and Content elements of Chinese history. In the 2011 History National Curriculum and 2011 World History National curriculum, systemization seemed to be done in terms of conceptualization of ‘Regional World’. However, in the case of Chinese history, History National Curriculum specifies the contents of Chinese history as a heading in the content element, and treats Chinese history as independent from East Asian head words, whereas it is not the case in the World History National Curriculum. Through the analysis of the contents of Chinese history in the textbooks, it can be said that there is not much difference in history terms, that it is not much different from the description of the text, and that the composition of the inquiry activity does not show the school-level gap. Therefore, the systemization of content elements is not fully realized. The 2015 History National Curriculum for middle school was noticed in June, 2018. It is characterized by the facts that ‘specific topics’ are specified as learning elements and that the teaching and learning methods are emphasized. In addition, it is noteworthy that the domestic research on the student’s historical thinking is increasing and the cases where the student’s level is emphasized in foreign history education curriculum. It is necessary to systematize contents element of National Curriculum reflecting these trends.

唐代 文書行政 法令의 체계와 그 의미 ― 公式令과 職制律을 중심으로

최재영 ( Choi Jaeyoung ) 한국중국학회 2020 중국학보 Vol.91 No.-

중국의 역사를 이해하는 주요한 키워드는 ‘皇帝’이다. B.C 221년 秦王 嬴政이 황제를 칭한 이래 중국에서 왕조가 여러 번 교체되었지만 황제를 정점으로 하는 중앙 집권적 권력체제는 일반 개개인과 사회 곳곳을 장악하려는 경향은 언제나 지속되었다. 그런 점에서 주목되는 왕조로 唐朝를 들 수 있다. 통치 지배 기제로서 핵심인 法制와 禮制 측면에서 唐朝는 秦漢이래로 형성·발전되어 온 통치체제를 통합하고 완성한 왕조로 평가받고 있기 때문이다. 본고에서는 ‘당대 문서행정 관련 법령의 내용과 조문의 배열이 황제를 정점으로 하는 문서행정 처리 구조를 갖추고 있을 뿐만 아니라 황제의 천하 통치 절차를 반영하고 있다’는 점을 논증하고자 하였다. 이를 위해 당대 문서행정 법령으로서 唐令의 公式令과 唐律의 職制律의 각 조문에 우선 정확한 해석을 진행하고 그를 바탕으로 조문과 조문 사이의 관계 및 배열의 의미, 조문에서 확인되는 문서 처리의 절차 등을 고찰하였다. 唐令 가운데 당대 문서행정과 관련된 사항을 규정한 것이 公式令이다. 현전하는 公式令을 통해 공문서의 발신-수신 등을 포함한 문서행정의 일면을 엿볼 수 있다. 특히 ‘制書式’ 조문을 통해 公式令은 황제를 정점으로 한 문서의 생산-처리-전달이라는 체계로 이루어졌다고 할 수 있다. 『唐律疏議』 가운데 특히 職制律에 공문서 관련 규정이 기록되어 있다. 職制律의 공문서 관련 조문 배열에도 ‘황제의 천하 통치 과정’이 반영되어 있는 듯 보인다. 그 순서가 制書를 중심으로 한 문서 행정 절차를 보여 주고 있기 때문이다. 즉, 公式令은 皇帝부터 지방 관서까지의 문서행정 체제를 규정하여 황제의 천하 통치 과정을 반영하고 있는 점, 그리고 職制律은 전체 조문의 배열만이 아니라 職制律의 공문서 관련 조문의 배열은 황제의 천하 통치 절차와 과정을 반영하고 있다는 점을 확인할 수 있었다. 결국 현전하는 唐代 公式令의 조문과 唐律 職制律의 공문서 규정에 대한 분석을 통해 唐令과 唐律에 문서행정에 관한 규정도 당대 장안성의 구조처럼 황제의 천하 통치를 실현하기 위해 정합적으로 구성되어 있다고 할 수 있다. The main keyword to understand the history of China is ‘Emperor’. Since the title of the emperor was established, the Chinese dynasties’ centralized system of power had always been inclined to dominate individual and social circles. In that sense, the Tang dynasty is noted. In terms of legal and control as the governing mechanism, it is regarded as a dynasty that integrates and perfects the ruling system that has been formed and developed since the founding. The purpose of this paper was to argue that the contents of the contemporary document administration-related laws and the arrangement of articles reflect not only the emperor’s document administration structure but also reflect the emperor’s rule of the world in Tang Dynasty. Gongshiling of Tang Statutes stipulated matters related to the administration of the documents of Tang Dynasty. The extant Gongshiling provides a glimpse of one aspect of the administration of documents, including the sending-receiving of official documents. In Zhizhilu of Tanglu shuyi, the articles related to official documents were recorded. The arrangement of them also seems to reflect the emperor’s process of ruling under the emperor. It is confirmed that Gongshiling defined the administrative system of documents from the emperor to the local government, reflecting the emperor’s process of governing the world. It was also confirmed that the arrangement of the entire articles of Zhizhilu and the arrangement of the articles related to the official documents of it reflected the emperor’s procedure and process of the rule of the world. In other words, the rules on document administration in Tang Code and Tang Law were also organized consistently to realize the emperor’s rule of the world like the structure of Chang’an at that time.

소형민수헬기 진동해석절차 및 기법에 관한 연구

최재영(Jaeyoung Choi),곽동일(Dongil Kwak) 항공우주시스템공학회 2016 항공우주시스템공학회 학술대회 발표집 Vol.2016 No.11

주조-전신재 겸용 알루미늄 합금에 대한 기계적 특성 평가

최재영(JaeYoung Choi),주경석(GyeongSeok Joo),김진평(JinPyeong Kim),신재혁(JaeHyuck Shin),김세훈(SeHoon Kim),한범석(BeomSuck Han) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11

Remediation of heavy metal using treatment agents for acid mine drainage

Jaeyoung Choi(최재영),Jung-Seok Yang(양중석),Ju Young Lee(이주영),Dongwook Kwon(권동욱) 한국지반환경공학회 2007 한국지반환경공학회 학술발표회논문집 Vol.2007 No.-

분산 메모리를 가진 병렬 컴퓨터에서 데이타 배분에 독립적인 LU 인수분해 알고리즘

최재영(Jaeyoung Choi),김민석(Minsuk Kim),권성주(Sungjoo Kwon) 한국정보과학회 1998 정보과학회논문지 : 시스템 및 이론 Vol.25 No.12

밀집 행렬에서의 선형 시스템 해를 구하기 위해 가장 널리 쓰이는 LU 인수분해 루틴들은 오랫동안 많이 연구되어 왔으며, 벡터 및 병렬 컴퓨터를 비롯한 거의 모든 시스템에 구현되어 있다. 이렇게 구현된 LU 루틴을 이용하여 각 컴퓨터의 성능을 서로 비교해 볼 수도 있으며, 이것이 LINPACK 벤치마크 자료이다. 본 논문에서는 분산메모리를 가진 병렬 컴퓨터에서 데이타 배분에 독립적인 새로운 LU 인수분해 알고리즘을 개발하였으며, 이를 블록순환분산법으로 분산되어 있는 데이타 행렬에 적용하였다. 하지만 다른 방식으로 분산된 행렬에도 이를 손쉽게 적용시킬 수 있다. 데이타 배분에 독립적인 LU 인수분해 루틴은 행렬 A가 분산되어 있는 순서를 따르지 않으며, 연산을 위한 최적의 블록크기로 연산을 수행한 후에 얻어진 해를 행렬 A의 원래 분산 순서를 따라 재배치하여 해 χ를 얻는다. 이 알고리즘은 분산되어 있는 행렬의 블록의 크기에 상관없이 항상 최대의 성능을 보이며, Intel Paragon 컴퓨터에서 기존의 ScaLAPACK의 LU 인수분해 루틴과 비교·분석하였다. LU factorization is the most widely used method for solving dense linear systems. The LU factorization algorithms have been extensively studied and implemented on most computer systems including vector and parallel computers. It is possible to compare the performance of computers using the LU factorization implemented on each system. This is a main idea of the LINPACK benchmark. In this paper, we present a data distribution-independent LU factorization algorithm on distributed-memory concurrent computers. We applied the algorithm to a data matrix decomposed with block cyclic data distribution, but it is possible to apply the algorithm to data matrices which are decomposed with any data distribution methods. The data distribution-independent LU factorization algorithm doesn't follow the conventional computational ordering. The solution vector χ is efficiently computed with an optimal computational block size, irrespective of physical data distribution. However it may be recomposed to recover the original data distribution. The algorithm is implemented and compared with the ScaLAPACK LU factorization on the Intel Paragon computer.

다채널 미디어 환경에서의 TV시청에 대한 탐색적 연구: 넷플릭스 시청시간을 중심으로

최재영(Jaeyoung Choi),윤상호(Sangho Yoon),김민영(Minyoung Kim),김세영(Saeyeong Kim),김영주(Youngju Kim),박선영(Sunyoung Park),최선희(Sunhee Choi),김성태(Sungtae Kim) 동국대학교 영상문화콘텐츠연구원 2023 영상문화콘텐츠연구 Vol.29 No.-