컨테이너 검색기 이송대차 추진용 선형 유도전동기의 2차측 리액션플레이트 재질에 따른 특성 연구

정재훈(Jae-Hoon Jeong),최장영(Jang-Young Choi),성소영(So-Young Sung),박종원(Jong-Won Park),임재원(Jaewon Lim) 대한전기학회 2016 전기학회논문지 Vol.65 No.1

This paper presents the analysis of the analysis of thrust characteristics of linear induction motors(LIMs) according to secondary reaction plate. LIMs are well known as high speed transport systems, which can obtain thrust directly without gears and links, or auxiliary mechanisms. A simple structure, easy maintenance, and less environmental pollution are advantages of LIMs. In transport systems using LIMs, the secondary reaction plate is an important design factor, because it has considerable impact on the cost of the railway as well as the performance of the LIMs. This paper deals analyzed the characteristics of linear induction motor used for moving the vehicle of container scanner. Thrust, efficiency and load characteristic were interpreted with FEM regarding two models whose material of secondary reaction plate was copper and aluminum. It suggested the interpretation of thrust, efficiency and power factor characteristic along slip and compared the operation ability of linear induction motor through characteristics analysis along the load.

알루미늄-크롬 용융도금강판의 미세조직과 집합조직에 미치는 크롬의 영향

임병문,홍승현,정재인,최장현,정원섭 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.10

Microstructure and texture changes of aluminized coatings on steel sheets having Cr ranging from 0.0% to 1.0% in the coated layer were investigated. The surface morphology of the Al-Cr coated steel is not influenced by the increase of Cr contents in the coated layer. While the coated layer of aluminized steel consisted of two phases of Al and Al_(5)Fe₂, the aluminized coating layer containing Cr was composed of three phases of Al, Al_(13)Cr₂, and Al_(13)Fe₄+Al_(5)Fe₂. The surface layer was Al, the middle layer was Al_(13)Cr₂, and the interfacial layer between the coating and the steel substrate was Al_(13)Fe₄and Al_(5)Fe₂. The texture of the aluminized coating without Cr was characterized as a {001} fiber texture which major orientation was {001}<110>. As the Cr content in the aluminized layer was increased to 1.0%, the texture of the aluminized coating was not changed but the intensity of the {001} fiber texture was increased. The major orientation in the {001} fiber texture was changed from the rotated cube orientation of the aluminized coating with 0.1%Cr to the cube orientation of the aluminized coating with 1.0%Cr.

염수분무 환경에서 알루미늄-크롬 용융도금강판의 부식생성물이 내식성에 미치는 영향

임병문,홍승현,정재인,최장현,정원섭 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.10

The effect of corrosion products of hot-dip Al-Cr steel sheet on the corrosion resistance were investigated. The results of XRD and XPS measurements showed that there was not found a hydroxide type corrosion product on the surface of aluminized steel after salt spray test(SST) but there was found some cracks in the surface layer which accelerates corrosion during SST. In Al-Cr coated steel case, the main phase of the corrosion products after salt spray test was found to be Al(OH)₃. The polalization curves of aluminized steel after SST shows that there was no passivation layer. For the Al coated layer, a porosity in the Al-oxide film on the surface layer leads to preferential corrosion. After the Al coated layer was completely removed, the Al_(5)Fe₂layer was selectively corroded and then, the steel substrate was exposed to the electrolyte. However, the polalization curves of Al-Cr coated steel after SST shows that the passivation layer was formed, which could increase the corrosion resistance of Al-Cr coated steel. In case of the Al-Cr coated layer, the densely covered hydroxide layer of Al(OH)₃and the intermetallic compound layer of Al_(13)Cr₂became a barrier against further corrosion after the Al layer was removed. In this case, corrosion was not proceeded even through the same current density. The densely covered hydroxide of Al(OH)₃and the intermetallic compound layer of Al_(13)Cr₂were considered to be one of the reasons of high corrosion resistance for Al-Cr coating.

數學敎育의 現況分析과 改善方案 (Ⅱ) : 中·高校 數學科 運營과 敎師 現況分析 Analysis of administrations and teachers of today's math. department in the middle and high schools

林在圭,奇宇恒,金演哲,金正遠 慶北大學校 師範大學 1981 敎育硏究誌 Vol.23 No.-

Owing to the curriculum's revision of primary and high school in the beginning of 1970, several elementary concepts of modern mathematics were introduced as new teaching contents. So the efficient ways to reeducate the present teachers and to publish a desirable textbook have been badly needed. In this paper, we investigate the present situations of administration and teachers of mathematics department in the city and rural area. On the basis of these results, we find out the better ways of mathematics education from the following points of view: 1. The general administrations of mathematics department. 2. The reeducation and education for mathematics teachers. 3. Mathematics textbooks. 4. Evaluations and tests.

녹차 및 결명자 추출물의 교정용 브라켓과 치면 사이의 경계부에서 분리된 mutans streptococci에 대한 항균작용

임성훈,서정순,윤영주,김광원,유소영,김화숙,국중기,이병래,차종희,박재윤 대한치과교정학회 2003 대한치과교정학회지 Vol.33 No.5

본 연구는 치아우식증에 관련된 Mutans streptococci 표준균주 및 임상분리 균주의 성장억제를 유도할 수 있는 천연 생약추출물을 검색하기 위하여 실시되었다. 녹차추출물은 CHMC-2032를 사용하였으며, 결명자 추출물은 50% 에탄올을 이용하여 얻었다. 이들 추출물의 Mutans streptococci 표준균주 및 교정환자들에서 브라켓과 치면 사이의 경계부에서 분리된 각각 10 균주씩의 S. mutans 및 S. sobrinus에 대한 최소성장억제농도를 액체배지 희석법으로 구하였다. 그 결과 CHMC-2032의 S. mutans 및 S. sobrinus의 표준 균주, S. sobrinus의 대부분 임상분리 균주에 대한 최소성장억제농도는 5 mg/ml이었다. 그러나 결명자 추출물에 의한 S. mutans 및 S. sobrinus에 대한 세균 성장억제 효과는 미미하였다. 본 연구 결과 치아우식증의 예방적 측면에서 결명자차보다는 녹차를 마시는 것이 유리하며, CHMC-2032를 이용하여 구강양치용액을 제조하여 사용할 경우 교정환자를 포함하여 대부분의 사람에게서 치아우식증 예방 효과가 있으리고 추정된다. Mutans streptococci is the major causative factor in dental caries. Especially, orthodontic patients with fixed appliance are a risk group for dental caries. Because fixed appliances attached on teeth may change the environment of dental plaque, the enamel decalcification or dental caries around the bracket and band is a major side effect of orthodontic treatment. The aim of this study was to search plant extracts that have antimicrobial effect on mutans streptococci. Seed-extract of Casio tora were prepared with ethanol and CHMC-2032, the leaf-extracts from Camellia sinensis extract, was obtained extract, 2 type strains and 20 clinical isolates of mutans streptococci isolated from the interface between orthodontic brackets and tooth surfaces in the orthodontic patients were used in this study. The minimal inhibitory concentration of CHMC-2032 was 5 mg/ml on the S. mutans KCTC 3065, S. sobrinus KCTC 3088, and 8 clinical isolates of S. sobrinus. However, there was no antibacterial effect of seed-extract of C. tora on mutans streptococci. These data suggest that green tea may be more effective than the tea prepared from C. tora in the prevention of enamel decalcification or dental caries around brackets.

한국의 영어과 교육과정의 변천과 미래

임정완 대구대학교 2005 대구대학교 학술논문집 Vol.1 No.1

연구의 목적은 우리나라 영어교육을 교육과정 변천사를 중심으로 살펴보며, 현재와 미래의 영어과 교육과정의 방향에 대해 논하는 데에 있다. 본 연구에서는 우리나라 영어교육과정의 변천사를 생성기, 전개기, 정립기, 정체기, 개혁기로 나누어 고찰하였으며, 개혁기는 다시 전반과 후반으로 나뉘어서 비교 논의되었다. 결론 및 제언으로는 향후 새로운 교육과정으로 개정 시 고려해야 할 사항들에 대해 논하고 있다.

기준모델 적응제어에 의한 유도 비행체의 자동조종장치설계에 관한 연구

林虎,朴正一,金元圭,朴鍾國 慶熙大學校 1989 論文集 Vol.18 No.-

This paper is concerned with the stability analysis and the design of an autopilot using direct model reference adaptive control for BTT missile with unknown dynamics when subjected to the longitudinal and lateral gusts. A motion of BTT missile can he seperated into the longitudinal and lateral motions, but there exist cross - coupling. The proposed algorithm is introduced different leakage terms about each motion into adaptation law so as to prevent drift of the adaptive gain and alleviate gust effects and cross - coupling. The algorithm is applied to the 6-DOF motion of an EMRAAT missile.

언밸런싱량을 이용한 주축의 에러보정

임정숙,정원지,이춘만 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

Spindle design is very important to improve the competitive power in production cost of high quality machine tools. In this paper, spindle system was designed with built-in motor can be used to simplify the structure, to improve the machining frexibility, and to perform high speed machining of machine tools. According to the spindle speed is high, spindle end's displacement is considered to be an important subject. To know how the unbalanced mass affect to the spindle end displacement, modal analysis was performed and analyzed. When, unbalanced mass was 0g, spindle front end displacement was a minimum, and unbalanced mass was 20g, spindle rear end displacement was kept to a minimum.

우관상동맥 개구부 완전 폐쇄가 동반된 대동맥 판상부 협착증 1례

임상현,김종진,김희열,진승원,전희경,노태호,채장성,김재형,홍순조,최규보,윤정섭,김치경 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.4

알루미늄-크롬 용융도금 강판의 식염수중에서의 부식거동

임병문,홍승현,정재인,최장현,정원섭 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.8

The microstructure and the corrosion behavior of aluminized steel sheet and hot-dipped Al-Cr wteel sheet were investigated. The EPMA, GDLS and XRD measurements of the Al-Cr coated layer showed that the coating layer was characterized by three phases. The surface layer was Al, the middle layer was Al_(13)Cr_(2), and the interfacial layer between the Fe substrate and the coated layer was composed of Al_(13)Fe_(4) and Al_(5)Fe_(2). The polalization curve indicates that the corrosion behavior of Al-Cr coated layer was different from that of Al coated layer. For the Al coated layer, porosities in the Al-oxide film on the surface layer lead to preferential corrosion. After the Al coated layer was completely removed, the Al_(5)Fe_(2) layer was selectively corroded and then, the steel substrate was exposed to the corrosion medium. In case of the Al-Cr coated layer, the Al_(13)Cr_(2) layer became a barrier against further corrosion after the Al layer was removed. In this case, corrosion was not proceeded even through the same current density. The high corrosion resistance was due to the existence of the Al_(13)Cr_(2) layer.