열분석에 의한 PDP 격벽용 출발유리조성의 결정화 특성 연구

전영욱,차재민,김대환,이병철,류봉기,Jeon, Young-Wook,Cha, Jae-Min,Kim, Dae-Whan,Lee, Byung-Chul,Ryu, Bong-Ki 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.8

고함량 PbO계 조성 PDP 격벽용 유리의 경우, 광학적, 기계적 및 전기적 물성들을 만족시키며, 동시에 높은 온도에서 열처리공정을 거쳐야 하므로, 유리의 조성-물성-공정상의 trade-off가 발생하여, 이를 극복하기 위한 방안으로서 유리의 결정화가 유효하다. 이에 본 연구에서는 고함량 PbO계 조성 PDP 격벽용 후보 유리계의 최적결정화조건을 확립하고자 열시차분석법(DTA)에 의한 결정화 특성을 연구하였다. $62PbO-19B_2O_3-10SiO_2-9(Al_2O_3-K_2O-BaO-ZnO)$(in wt%) 조성계의 유리에 결정핵생성 및 성장을 위해 $TiO_2$를 3 wt%를 첨가한 수, 용융/냉각/분쇄 처리 후 얻어진 유리 분말을 $445^{\circ}C$에서 각각 1∼10시간 열처리하여 핵생성을 시켰으며, 이렇게 얻어진 각 유리 분말은 각기 $5∼25^{\circ}C/min$의 가변 승온속도로 DTA 측정을 하였다. DTA 결정화 피크 온도는 승온속도가 높아짐에 따라 증가하였고, 열처리 시간이 증가함에 따라 감소하였다. Avrami 변수는 1에 근사하는 값이 얻어져서, 표면결정화가 우선하였으며, 최대 핵생성 처리시간은 2시간이었다. In order to overcome trade-off among compositions, process and properties of the glasses with high PbO-base composition for PDP Rib, we studied glass crystallization and crystallization kinetics by Differential Thermal Analysis(DTA). Glass powder was obtained through melting/cooling/grinding, with 3 wt%TiO2 addition for the crystal nucleation and growth in $62PbO-19B_2O_3-10SiO_2-9(Al_2O_3-K_2O-BaO-ZnO)$(in wt%) composition glass. This powder was heat-treated for 1 to 10 h at $445^{\circ}C$ for nucleation. DTA measurements were performed to obtain the crystallization peak with $5∼25^{\circ}C/min$ heating rates. DTA crystallization peak temperature increased with increasing the heating rate and decreased with increasing the heating time. Because the Avrami parameter (n) was approximately 1, the surface crystallization occurred. The maximum nucleation time was 2 h.

한국병합 직후 일본 육군 및 제국의회의 ‘제국통합’ 인식과 그 충돌의 의미

전영욱(Jeon, Young-wook) 고려대학교 아세아문제연구소 2014 亞細亞硏究 Vol.57 No.2

식민지기 서대문형무소 주변의 옥바라지

전영욱(Jeon, Young Wook) 도시사학회 2016 도시연구 Vol.- No.16

지금의 무악동 45, 6번지를 가리키는 ‘옥바라지 골목’은 과거 ‘서대문형무소’에 수감된 자들의 가족과 지인들이 옥바라지를 위해 잠시 기거했던 곳이었다. 이렇게 독특한 역사성을 지녔던 ‘옥바라지 골목’은 2016년에 철거되었다. 그런데 이 공간을 중심으로 철거에 반대하는 사람들이 모이기 시작하면서 새로운 형태의 현재성이 생겼다. 다시 말해 ‘옥바라지 골목’에는 국가, 사회, 도시, 감옥 등과 관련된 역사성과 현재성이 공존하게 되었다. 이 글은 이러한 역사성과 현재성이 어떤 의미를 지니고 있는지를 생각하기 위해 식민지 시기 서대문형무소 주변의 옥바라지 행위를 살펴보고자 했다. 식민지 조선의 감옥 행정은 ‘항일’을 ‘범죄’로 취급하면서 시작되었다. 따라서 감옥은 통치에 저항하는 세력과 일반 사람들 사이를 가로막는 역할을 하였다. 서대문형무소의 기능 역시 이런 것이었다. 감옥은 수감자들을 다양한 방식으로 통제하면서 사회와 격리시키고자 하였으며, 이는 수감자들과 일반 민들을 통치에 순응케 하기 위한 시도였다. 그러나 이러한 시도는 식민지 全기간 동안 성공한 적이 없었다. 옥바라지가 수감자들과 사회를 끊임없이 연결하고자 했기 때문이다. 옥바라지는 감옥의 통치가 늘 불안한 상태에 놓여 있게 하는 동력이었고, 이런 점에서 “감옥에 대한 근본적인 저항”이었다. 서대문형무소 주변의 옥바라지는 다양한 형태로 이루어졌다. 서대문형무소가 ‘미결수’와 ‘기결수’를 동시에 수감하던 감옥이었다는 점은 형무소 주변의 옥바라지에 큰 변수가 되었다. 형무소 주변에는 날마다 수감자들을 옥바라지하려는 사람들이 몰려들었고, 수감자들은 이들의 옥바라지를 통해 감옥의 통제에 맞설 수 있었다. 수감자들이 증가할수록 서대문형무소 주변의 옥바라지는 일상적인 행위가 되어 갔으며, 이를 계기로 주변에 새로운 공간이 생겼다. 이것이 ‘옥바라지 골목’이다. 옥바라지는 “감옥에 대한 저항”이라는 점에서 역사성과 현재성을 동시에 지니는 행위이며, “철거된” ‘옥바라지 골목’은 그 행위자들이 모였던 사회적 공간이었다. ‘Okbaraji Alley,’ which is now 45 and 46, Moak-dong, was a place where people whose family members or friends were confined in ‘Seodaemun Prison’ to stay temporarily supporting them. ‘Okbaraji Alley’ with this unique historicity was demolished in 2016. However, those who were against demolition started to gather around the alley and they created a new form of presence. In other words, ‘Okbaraji Alley’ became a place in which the historicity and the sense of presence coexist with respect to country, society, city and prison. This article was intended to investigate Okbaraji around Seodaemun Prison during the Japanese colonial period in order to review the meanings of such historicity and the sense of presence. Prison administration in Korea during the Japanese colonial period started with a notion that regarded ‘resistance against Japan’ as ‘crimes.’ Thus, prisons served as a barrier between those who resisted against the Japanese colonialism and ordinary people. Seodaemun Prison also served this kind of roles. They controlled prisoners with a variety of means trying to isolate them from the society and that was intended to make prisoners and ordinary people accept and comply with their rules. However, they had never succeeded for a single time during the Japanese colonial period. It’s because Okbaraji continued to keep prisoners close to the society. Okbaraji had always caused instability of the rules within prisons and, for such reason, it was a “fundamental resistance against prisons.” Okbaraji around Seodaemun Prison was done in various forms. Seodaemun Prison took both “prisoners in trial” and “convicted ones” in custody and that became a huge variable to Okbaraji. A lot of people gathered around it to support prisoners every day and prisoners could stand against its control by the help of Okbaraji. As the number of prisoners increased, Okbaraji became a common thing around the prison, creating a new place called ‘Okbaraji Alley.’ Okbaraji is an action that contains both the historicity and the sense of presence with respect to “resistance against prisons” and the “demolished” ‘Okbaraji Alley’ was a social place in which people gathered for such action.

일제시기 경성의 ‘公設質屋’ 설치

전영욱(Jeon, Young-Wook) 서울시립대학교 서울학연구소 2014 서울학연구 Vol.- No.54

This paper exposes the wish of the colonial power to secure public authority through the process of installing a public pawnshop(公設質屋) at Kyungsung(京城), finally taking notice of its inborn impasse. The social relationship possessed by the Ch’eondangpo(pawnshop; 典當鋪) and Sichiya( Japanese-style pawnshop; 質屋) at Kyungsung was never considered in the public welfare service of Chosun, which led to the direct opposition from the owner of Ch’eondangpo and Sichiya and then to a dispute at the city council in 1929. Kyungsung city’s efforts to resolve this bore some fruit at the city council in 1931 through ‘alliance’ with Chosun representatives, reaching the agreement that the public pawnshop should be increased in number. However, this need never materialized properly throughout the colonial period. In this sense, the public authority of the colonial power was very weak. Ch’eondangpo and Sichiya were the most typical financial services for the working class in Kyungsung at the colonial period. Both were the same in the frame of operations, such as conferring about the interest rates and terms of foreclosure from each of association, but with a clear difference in the owner’s ethnic component, distribution area, etc. The colonial power of the colonial Japanese authorities and Kyungsung city struggled to manage these Ch’eondangpo and Sichiya. At first, they sought for expedient control but the social work on the imperial scale appearing in the 1920’s made them reconsider the existing method of control. That is, the colonial power made an attempt to deprive both styles of pawnshop of social nature by establishing a public pawnshop. However, the colonial power had difficulty interpreting many social problems surrounding Ch’eondangpo and Sichiya in terms of ‘Chosun things.’ Besides, they failed to be quick in taking sole possession of the idea of ‘public interest’ needed for its resolution, either. In the meantime, the association as an interest group proceeded to interpret the public benefit in a different way than the colonial power. Such a situation evolved into the aspect of collision and alliance among political powers at the city council in 1929 and 1931. Here worked the colonial power like Kyunsung city, different views between Chosun and Japanese representatives as variables. Though, at last, East Public Pawnshop(東部公益質屋) and West Public Pawnshop(西部公益質屋) were established in December 1929 and December 1931, respectively, it was far too short to support the public representative nature held by the colonial power. This case of Kyungsung well illustrates why the attempt of the colonial power to secure public authority had to fail inescapably.

8, 90년대 `진보적` 한국사학계의 `올바른 역사인식`이라는 자기규정

전영욱 ( Jeon Young Wook ) 역사문제연구소 2017 역사문제연구 Vol.21 No.1

Korean history academia had fought against the policy for government-approved history textbooks titled `Correct History Textbook` by the Park Geun-hye administration. The academia had exercised their effort to argue that the wording `correct` itself is against the public and the spirit of the Constitution. However, the expression `correct perception of the history` was a synonym of academic sensitivity that had been argued since the mid 1980`s by progressive history-related academic groups which are now among the `three representative history-related groups` in Korea. They had been involved in studies and education to promote such sensitivity throughout the society. Young history scholars during 1980`s assumed that people were the subject of the history and argued that historical studies should contribute to the innovation in reality. In order to achieve such goals, they tried to publish `popular books` serving as an alternative to textbooks in schools or educational materials in universities. Furthermore, they exercised much effort to reflect their research performance in those textbooks. However, such effort had been challenged by the social atmosphere in 1990`s which can be represented by the conflict between the progressives and the conservatives. Those young history scholars faced a dilemma that they should focus on the public awareness of the history rather than on people themselves as leaders in progressive academic societies. The academic sensitivity in the progressive korean history academia of 1980`s and 1990`s was created during the time when the societies were struggling to investigate their relationship with the society. However, as time went by, the subject of the history called people had been decorated by the nation. As a result, organized academic movements during these days can only reveal their existence in the society only by emphasizing the concept of people and the Constitution. Now is the time for us to take a careful look into relationships among what the society ask for historical studies, what the academia should suggest to the society and what an individual researcher can do in the society and in academia.

PDP Rib용 Bi₂O₃-B₂O₃-ZnO계 유리의 물성과 구조

진영훈,전영욱,이병철,류봉기,Jin, Young-Hun,Jeon, Young-Wook,Lee, Byung-Chul,Ryu, Bong-Ki 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.2

본 연구는, PbO-base 유리계의 정보와의 비교 등을 통해 Bi-base 조성 PDP rib으로의 새로운 유리조성 설계를 위한 기초연구의 일환이다. PbO와 유사한 밀도값 및 작업 용이성을 갖고 있는 Bi를 도입한 $Bi_2O_3-B_2O_3-ZnO$ 조성계에 대해, 연화점, 열팽창계수, 에칭성, 유전율 등의 특성측정 및 XPS로 조성에 따른 구조변화 등을 조사하였다. $Bi_2O_3$를 50∼80 wt%까지 폭넓게 첨가된 $Bi_2O_3-B_2O_3-ZnO$계 유리들은 조성에 따라 연화점이 400∼480$^{\circ}C$, 열팽창계수가 $68{\sim}72{\times}10^{-7}/^{\circ}C$, 유전상수는 13∼25으로서 동조성의 Pb-base 조성계와 유사한 물성치를 나타내었다. 특히, Bi의 함유량이 70∼65 wt%의 조성의 경우, 성분 및 물성의 미세조정 등을 통해 rib 재료의 출발조성으로서 적용가능성이 확인되었다. $Bi_2O_3$의 양이 감소함에 따라 $O_{1s}$ peak에서의 결합에너지의 증가와 반가폭(FWHM)이 감소하였는데, 이는 비가교산소의 증가에 기인하였다. This study, compared with data of PbO-base glass system is a part of new glass composition design with Bi-base composition for PDP Rib. As $Bi_2O_3-B_2O_3-ZnO$ glass composition including Bi, which have similar density value and work facility to PbO, properties of softening point, thermal expansion coefficient, chemical durability, dielectric constant, and structural changing by XPS were investigated. $Bi_2O_3-B_2O_3-ZnO$ glass system, added 50∼80 wt% $Bi_2O_3$ widely, were presented 400∼480$^{\circ}C$ softening temperature, $68{\sim}72{\times}10^{-7}/^{\circ}C$ thermal expansion coefficient and 13∼25 dielectric constant. These results were showed similar physical properties with Pb-base glass system of same composition content, application possibility as starting composition of rib material was identified through micro-control of components and physical properties. The bonding energy of $O_{1s}$ as the $Bi_2O_3$ content decreasing was increased and full width at half-maximum (FWHM) was decreased, which is caused by non-bridging oxygen increasing.

소독부산물 전구물질(NOM) 제거를 위한 응집공정의 최적화에 관한 연구

고길현(Gil hyun Go),전영욱(Young-wook Jeon),김수현(Suhyun Kim),강임석(Lim seok Kang) 대한환경공학회 2019 대한환경공학회지 Vol.41 No.6

소독부산물이 전 세계적으로 문제가 제기되면서 보다 신뢰성 있고 효율적인 수처리 공정 기술 개발에 많은 관심이 집중되고 있다. 소독부산물 형성을 줄이기 위한 NOM 제거의 중요성은 증가하고 있다. 응집 공정은 NOM을 용이하게 제거 하기 위한 하나의 방법이다. 따라서 본 연구에서는 NOM의 특성과 소독부산물 형성의 관계를 조사하고, 소독부산물의 감소를 위해 NOM의 효율적인 제거를 위한 최적의 응집 조건을 알아내는 것이다. 황산알루미늄과 제2염화철의 최적 응집 조건은 0.15 mM 응집제 주입량에서 pH 5.5로 나타났다. pH 5.5 조건에서 0.15 mM의 제2염화철의 주입한 경우 용존유기탄소는 55% 제거, 트리할로메탄은 65%, 할로아세틱애시드는 67% 감소하였다. 황산알루미늄의 경우 용존유기탄소는 46.3%, 트리할로메탄은 61%, 할로아세틱애시드는 49% 감소하였다. 원수의 pH가 낮을수록 응집공정에 의해 NOM의 제거는 증가하였고 소독부산물 생성은 감소하였다. 또한 제2염화철이 황산알루미늄보다 NOM을 제거하고, DBPs 생성을 감소시키는데 더 효과적이었다. As the problems of disinfect by-products (DBPs) around the world become an issue, much attention has been focused on developing more reliable and efficient water treatment processing technologies. The removal of NOM to reduce the formation of DBPs is increasingly important. Facilitating the removal of NOM is one of the key reasons for using coagulation. Therefore, the objective of this study was to investigate relationships between the properties of NOM precursors and DBPs formation, and find out the optimum coagulantion conditions for efficient removal of NOM to reduce the amount of DPBs formation. The optimum conditions for the alum and ferric chloride coagulation pH for removal of NOM was 5.5 with 0.15mM coagulant dose. When adjusting pH to 5.5 with 0.15 mM ferric chloride 55% DOC removal, 81.7% THMs reduction and 89.4% HAAs reduction was achieved. when using alum 46.3% DOC removal, 70.2% THMs reduction and 74.7% HAAs reduction was achieved. The results showed that lowering pH of raw water increased the removal of NOM during coagulation process and reduced DBPs formation. Also, ferric chloride was more effectively than alum for remove NOM and reduce DBPs formation.

기획특집 : 발효주류의 미생물학적 위해요소

김선애 ( Sun Ae Kim ),심문보 ( Moon Bo Sim ),전영욱 ( Young Wook Jeon ),이민석 ( Min Suk Rhee ) 한국식품위생안전성학회 2014 Safe Food Vol.9 No.1

고속전철용 트랙제동 및 와전류제동장치 기술동향

최권희(Choi Kweon-hee),장대성(Chang Dae-sung),김철근(Kim Chul-keun),한동인(Han Dong-in),전영욱(Jeon young-wook) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-

Most of the train brakes depends on friction between wheels and tracks. This requires braking force reduced in order not to cause wheel slides since the friction decreases as the train speed increases and consequently results in extension of braking distance. The braking system called "Linear eddy current brake" or simply " Eddy current brake" is a braking system for making a brake independent from friction, which consists in creating electromagnet by coiling around shoes attached to bogies; having the shoes above the tracks approached to the tracks upon acknowledgement of a braking command; and authorizing braking force that is irrelevant to friction through magnetic repulsion between electromagnet attached to the tracks and train set by the use of the electromagnet"s magnet field characteristics. An electromagnetic attraction braking system that consists in pressing pole shoes attached to bogies against the tracks by using electromagnet"s attraction force is called "Electromagnetic track brake" or simply "Track brake". This paper has been prepared in purpose of studying technological tendencies of the eddy current brake and the track brake so that it can be utilized as fundamental data for commissioning Korean high-speed trains with the eddy current brake hereafter.

Enterococcus faecolis KBL703 Plasmid p703/5의 Replication Origin의 Cloning

전영욱,정세영,김영우,장효일 한국산업미생물학회 1994 한국미생물·생명공학회지 Vol.22 No.1

Enterococcus faecalis KBL 703은 서로 다른 크기를 갖는 3개의 plasmid들을 가지고 있다(p703/9, p703/5, p703/4). 이 plasmid 들중 하나인 p703/5로부터 plasmid 복제에 필요한 부위(regplicaiton origin)를 분리하였다. 이를 위한 En. faecalis 형질전환실험의 숙주로 사용하기 위하여 두개의 plasmid-cured 변이주를 얻었으며, 각 p703/5의 DNA 절편과 CAT(chloramphenicol acetyl transferase) 유전자를 가진 4개의 DNA 구조물들로 이들을 형질전환시킨 결과 제한효소 SalI으로 절단된 p703/5의 3.6 kb DNA 절편을 가진 DNA 구조물만이 이 균주내에서 plasmid로서 안정하게 유지됨을 알 수 있었다. En. faecalis ATCC 29212를 형질전환하였을 때에도 이 새로운 재조합 plasmid가 세포내에서 안정하게 유지됨을 알 수 있었다. Enterococcus faecalis KBL703 has three plasmids(p703/9, p703/5 and p703/4). Within p703/5, the specific DNA region that would confer replication function(replication origin) was searched by transformation experiments. In order to use as the recipient of transformation, two plasmid-cured strains were made from this strain. Four recombinant DNA constructs, each containing fragment of p703/5 and CAT(chloramphenicol acetyl transferase) gene were also made. And they were used to transform the plasmid-cured strains. Only one DNA construct containing 3.6 kb Sall fragment was stably maintained as plasmid in these strains. Additional experiment using another Enterococcus faecalis strain(ATCC 29212) as a recipient was successfully done and it was confirmed that this newly constructed recombinant plasmid contained the replication origin from p703/5 plasmid.