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질산산화법을 이용한 SiO<sub>2</sub>/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.
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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.
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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.
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崔宰榮(Choi, Jaeyoung) 역사교육연구회 2017 역사교육 Vol.142 No.-
This paper is a study of the description of ancient and medieval Chinese history in the high school world history textbooks. The main subject to be analysed is the historical terms in them. It is intended to measure whether the history for the world of the region and its own historical development is properly described as stipulated in the world history curriculum for 2011. The findings of examining the description of ancient and medieval Chinese history in the high school world history textbooks show that it is a simple compilation of the history for each dynasty in the entire Chinese history. It is difficult for high school students to understand the historical development. This problem is expected to be resolved through writing Chinese history by field such as politics, economy, society, and culture. In this way, the development of Chinese history and its meanings will be delivered to students more effectively. A variety of views and ways to describe the contents of world history textbook is needed to find in points that historical facts is not taught fragmentarily in the class of history and the insight into human being and its society will be cultivated in learning history.
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최재영(CHOI JAEYOUNG),이현수(LEE HYUNSOO),정근호(JEONG GEUNHO) 한국타이포그라피학회 2021 글짜씨 Vol.- No.21
한글 폰트 한 벌을 디자인하기 위해서는 2,350자 내지 11,172자를 제작해야 하며, 1년 이상의 제작 시간이 소요되기도 한다. 또한 굵기·폭·획 대비 등을 변경한 폰트 패밀리로 확장할 경우에는 몇 배의 시간이 필요하다. 본 논문에서는 폰트 제작의 한계점을 극복하기 위해 기본 폰트의 골격에서 매개 변수를 변경해 다양한 모양의 글자를 생성할 수 있는 스템폰트 (stemfont)를 제안한다. 스템폰트에서는 기존 외곽선 폰트 형식으로 제작된 글리프의 제어점에 새로운 속성을 추가하고, 추가된 속성을 폰트에 반영하는 매개 변수 관계식을 만든다. 관계식의 매개 변수 값을 조정하여 획을 바꾸고 다양한 폰트를 생성할 수 있다. 스템폰트는 웹서비스 상에서 사용자 인터페이스로 제공되기 때문에 디자이너가 아닌 사용자도 이용할 수 있다. 따라서 쉽게 다양한 폰트 파생이 가능하고, 폰트 디자인에 드는 시간과 비용을 줄일 수 있다. You have to design a total of 2,350 to 11,172 letters to develop a single set of Hangeul font, a process that typically takes more than a year. The amount of time required can double or even triple if you are producing an extended font family with adjusted thickness, width, and stroke contrast. This paper proposes STEMFONT, which can generate letters of various shapes by adjusting the parameters of the basic structure of existing fonts. STEMFONT adds new properties to control points on the glyphs produced with the conventional outline font method, and generates parameter relations that reflect the added properties to the fonts. By adjusting the parameter values of the relations, you can modify strokes to create a variety of fonts. As STEMFONT is provided on a web service through a user interface, users who are not designers can also easily access the system. In this way, the system encourages the creation of new font designs and reduces the time and cost involved.
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