The Effect of Mo Addition on Oxygen Vacancies in the Oxide Scale of Ferritic Stainless Steel for SOFC Interconnects

윤대원,정희원,서성문,이형수,유영수 한국부식방식학회 2024 Corrosion Science and Technology Vol.23 No.1

The concentration and diffusion coefficient of oxide ion vacancies in the oxide scale formed on Fe-22Cr-0.5Mn ferritic stainless steel with and without molybdenum (Mo) was measured at 800 °C by the electrochemical polarization method. After pre-oxidation for 100 h in ambient air at 800 °C, the oxide scale on one side was completely removed with sandpaper. A YSZ plate was placed on the side where the oxide scale remained. Platinum (Pt) meshes were attached on the top of the YSZ plate and the side where the oxide scale was removed. Changes in electrical current were measured after applying an electrical potential through Pt wires welded to the Pt meshes. The results were interpreted by solving the diffusion equation. The diffusion coefficient and concentration of oxide ion vacancy decreased by 30% and 70% in the specimen with Mo, respectively, compared to the specimen without Mo. The oxide ion vacancy concentration of chromia decreased due to the addition of Mo.

1910년 병합 「칙유」의 文書上의 결함과 불법성

윤대원 서울대학교 규장각한국학연구원 2011 한국문화 Vol.53 No.-

Emperor Sunjong’s(純宗皇帝) Imperial Instruction on the Transfer of Sovereign Rights to Japan(倂合勅諭) which had been promulgated in 1910 August 29th was that Japan fabricates. This Imperial Instruction until 1907 November 9th was equipping the traditional document format namely the format of Great Seal(御璽) and countersignature. But after where November 18th Japan forces a Japanese document format, Koreans Imperial Instruction with Japan and sameness changed in the format of Royal Name(御名), Great Seal and countersignature. But to Imperial Instruction there was only Great Seal, it was different with Japanese Emperor's Imperial Edict(詔勅) which is same character. Korea and Japan promised to announce Imperial Edict simultaneously. Announcing simultaneously was not Imperial Instruction but clearly Imperial Edict. So Resident- General Terauchi Masatake(寺內正毅) August 27th prepared Imperial Edict on the assumption of Emperor Sunjong’s sanction. By the way This Imperial Edict August 29th was exchanged suddenly in Imperial Instruction. The reason is because Emperor Sunjong refuses an sanction. Japan fabricated Imperial Instruction from the objective which will complement the problem point of the Korea-Japan Annexation Treaty(倂合勒約) which lacks a ratification process. So the fabricated Imperial Instruction is historical evidence which Emperor Sunjong opposed a treaty, and to correspond to the ‘national representatives on the force’ which custom international law provide a treaty with invalidity’.

19세기 변란 참가층의 사회적 관계망과 존재양태

윤대원 서울대학교 규장각한국학연구원 2012 한국문화 Vol.60 No.-

This study examined the participants' social networks and their existence aspect of two 19th-century representative upheavals(Haeseu(海西)․Youngnamin(嶺南人) upheavals and Reepiljeran(李弼濟亂)). First we could confirm the fact that ‘sarando’(思亂徒) is widely distributed in the late Joseon contrycide society. they were a poor scholar(貧士․寒儒) excluded or marginalized from the central and provincial power relations in the late Joseon period. Discussing Jeonggamrok(鄭鑑錄) kind of prophecy and divination, current events, they were able to determine the consciousness of kind with each other. Based on this recognizing they confered upheaval and formed a social network using blood and territorial relationship such as the primarily social relationship and Jeonggamrok and fengshui(風水) such as coronary. This network contains a hidden hope of the peoples but there was no prospect for the new society. Because networks could have a high scalability and voluntary loyalty. Despite these limitations we can see some meaningful facts, that is the evolution of the network. Leaders organized 'Nanbonggye'(難逢契) or ‘Samseongdanggye’(三聲堂契), this was not the existing ‘gye’(契) namely 'Donggye'(洞契) or ‘Hyodogye’(鄕徒契) but was a kind of the organization that contained several provinces. This was one of the reasons why 19th century upheaval was able to be deployed beyond one area. The other one is the expansion of the new communication space. The market and inn developed in the late Joseon period, was functions as the communication space or the main stronghold to communicate gather information and comrades. But Above all, the noted fact is a behavior patterns that upheaval participants concludes relationship to each other and a social phenomenon that allow such a thing. In other words is the fact that the groups have their own behavior in the form of communication was widely distributed in contrycide society, as well as the autonomous space they could communicate with each other was exteded in the late Joseon period. This study examined the participants' social networks and their existence aspect of two 19th-century representative upheavals(Haeseu(海西)․Youngnamin(嶺南人) upheavals and Reepiljeran(李弼濟亂)). First we could confirm the fact that ‘sarando’(思亂徒) is widely distributed in the late Joseon contrycide society. they were a poor scholar(貧士․寒儒) excluded or marginalized from the central and provincial power relations in the late Joseon period. Discussing Jeonggamrok(鄭鑑錄) kind of prophecy and divination, current events, they were able to determine the consciousness of kind with each other. Based on this recognizing they confered upheaval and formed a social network using blood and territorial relationship such as the primarily social relationship and Jeonggamrok and fengshui(風水) such as coronary. This network contains a hidden hope of the peoples but there was no prospect for the new society. Because networks could have a high scalability and voluntary loyalty. Despite these limitations we can see some meaningful facts, that is the evolution of the network. Leaders organized 'Nanbonggye'(難逢契) or ‘Samseongdanggye’(三聲堂契), this was not the existing ‘gye’(契) namely 'Donggye'(洞契) or ‘Hyodogye’(鄕徒契) but was a kind of the organization that contained several provinces. This was one of the reasons why 19th century upheaval was able to be deployed beyond one area. The other one is the expansion of the new communication space. The market and inn developed in the late Joseon period, was functions as the communication space or the main stronghold to communicate gather information and comrades. But Above all, the noted fact is a behavior patterns that upheaval participants concludes relationship to each other and a social phenomenon that allow such a thing. In other words is the fact that the groups have their own behavior in the form of communication was widely distributed in contrycide society, as well as the autonomous space they could communicate with each other was exteded in the late Joseon period.

[우리는 미국을 어떻게 보아 왔나 2] 일제시기 친미외교론과 대미인식

윤대원 내일을 여는 역사 2003 내일을 여는 역사 Vol.12 No.-

[사실, 이렇게 본다 2] 좌우연합을 지향한 대한민국 임시정부

윤대원 내일을 여는 역사 2004 내일을 여는 역사 Vol.18 No.-

대한민국임시정부 연구, 이제는 사실과 객관성을

윤대원 재단법인 내일을여는역사재단 2007 내일을 여는 역사 Vol.28 No.-

학교수학에서 경험적 일반화와 이론적 일반화의 고찰

윤대원,김동근 한국수학교육학회 2009 수학교육 프로시딩 Vol.43 No.-

일제의 한국병합 방법과 식민 통치 방침

윤대원 서울대학교 규장각한국학연구원 2015 한국문화 Vol.70 No.-

The article 「thing about the administration of the Korea / thing about the Korea annexation」 written by Department of the Army former May 1910 is an important material that Japanese military has led to annex in the implementation phase of the annexation. Since Japan decided to annex immediately January 1910, the Army Secretary Terauchi(寺內正毅) and Department of the Army were led to annex. The Army Secretary Terauchi appointed to a Resident-General was entrusted fully how and when to annex. This is meant to be accomplished the continental policy of Japanese military since the Meiji Restoration(明治維新). Accordingly the Japanese military had a full-scale military aggression in Korea as a colony and Korea became the base of the continental policy in Japan. This was an illegal act of aggression ignored completely free will of the Korean people. How to annex Japan chose was two. One was to annex by the petition of the Korea Emperor and the Treaty. the other was to annex by the unilateral declaration. The annexation was done according to the will of Japan as measures of the former. This was externally to conceal and streamline the illegal character of the annexation, moreover was intended to minimize the resistance of the Korea officials and people. Therefore, the nature of this annexation was one of the essential elements revealing the violence of colonial rule after the annexation.

대한민국임시정부의 재건과 관내 민족전선통일운동

윤대원 역사학연구소 2002 역사 연구 Vol.- No.10

사각뿔대 부피를 구하는 다양한 방법에 대한 탐구

윤대원,김동근,Yoon, Dae-Won,Kim, Dong-Keun 한국수학사학회 2010 Journal for history of mathematics Vol.23 No.3

고대 이집트인들은 나일강의 범람으로 토지의 넓이 측정이 필요했으며, 또한 사각뿔 모양의 피라미드를 건설하였다. 이 피라미드는 실제 계단식으로 만들어져 있고 각각의 계단을 이루는 모양을 보면 사각뿔대의 모양임을 알 수 있다. 즉 사각뿔대의 부피의 합으로 피라미드가 건설되었다고 볼 수 있다. 따라서 본 논고에서는 사각뿔대의 부피를 구하는 공식이 역사발생적으로 어떻게 변천되었는지 우선 고찰하여 보고, 둘째, 모스크바 파피루스의 14번 문제에 기록되어 있는 사각뿔대 부피의 계산방법으로 추정되는 것을 Prasolov의 연구를 중심으로 살펴본 뒤 중학교 교과서에 제시된 풀이 방법을 살펴본다. 마지막으로 각뿔대의 부피에 대한 다양한 풀이 방법과 그 일반화에 대해 고찰한다. This is the study for various methods for getting the volume of frustum of pyramid. This study will first deal with how the formula of getting the volume of frustum of pyramid has been changed in the history of Mathematics. Secondly, based on the study of 'Prasolov' this study will deal with the calculation method for the volume of frustum of pyramid which was written in the 14th question of 'Moscow Papyrus' and search for the rules of solution for frustum of pyramid in the middle school textbooks. Finally, this study will consider various solutions for the volume of frustum of pyramid and its generalization.