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Active Inductor를 위한 능동대역통과필터의 설계 및 제작
이기훈,신용환,임영석 전남대학교 전자통신기술연구소 2001 전자통신기술논문지 Vol.4 No.1
In this paper, Active Band Pass Filter using AI(Active Inductor) is designed and fabricated. Active Inductor represented 1.74 nH inductance only using Single P-HEMT (Psedomorphic High Electron Mobility : ATF-34143 producted by Agilent) and its characteristies are similiar to ideal 2 nH inductor. The whole circuit was fabricated on the Teflon substrate ( ε_(y)=3.38, T=0.78mm) using a microstrip line and ADS(Advanced Design System) was used in order to design and optimize. The results between simulation and measurement of Active Band Pass Filter have good agreements. The results indicate that Active Band Pass Filter using AI (Active Inductor) adequate for recievers of IMT-2000 User Equipments
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이기훈,조정용,이형재,박근영,마영규,이상현,조정안,김월수,박근형,문제학 한국식품과학회 2011 Food Science and Biotechnology Vol.20 No.6
Eight phenolic compounds were isolated from the EtOAc-soluble acidic layer of methanol extracts of Asian pear (Pyrus pyrifolia Nakai cv. Chuhwangbae) fruit peels. These isolated compounds were identified to be arbutin (1),4-(O-β-D-glucopyranosyl)-3-(3'-methyl-2'-butenyl)benzoic acid (2, malaxinic acid), 3,4-dihydroxybenzoic acid (3),trans-chlorogenic acid (4), cis-chlorogenic acid (5),isorhamnetin 3-O-β-D-glucopyranoside (6), 3,5-dicaffeoylquinic acid (7), and (-)-epicatechin (8) based on electronic spray ionization (ESI)-MS and NMR spectroscopic data. Of the isolated compounds, 2 and 5 were identified in pear for the first time.
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능력주의의 식민지적 기원―조선일보 독자란에 나타난 입신주의
이기훈 역사문제연구소 2022 역사비평 Vol.- No.140
This paper aims to trace the historical origins of meritocracy in Korea back to the perception and thoughts of the general public during the colonial period. To this end, the classified advertisement section of Chosun Ilbo titled <Dokja Sagyoshil (Readers’ Lounge)>, which started in 1936, is analyzed. <Dokja Sagyoshil> printed classified ads submitted by the readers on matters ranging from job search, help-wanted, buying, selling and trading of goods to exchange of practical information. With any hopes for progressive social change blocked under the colonial rule, frustrated young elites or those who aspired to become one flocked to what seemed to be the path to success, leading to power and capital. However, it was extremely difficult for the young people to actually succeed; it was almost impossible for the people of Choseon to pass various qualification exams offered by the Japanese colonial authorities and gain credentials. The young generation of Choseon deliberately ignored this reality, in which they were discriminated, and stubornly worshiped the illusionary mantra of “work hard, succeed and make a name for oneself in the world.” But the trapped and frustrated young generation of Choseon had no escape. The blind pursuit of literature and art among the young people could be understood as an expression of the same frustration, only on the other side of the spectrum. Success stories, decorated with academic credentials and passing of state qualification exams, were far out of reach for most young people of Choseon at the time. The meritocracy observed in Korea nowadays clutches on to the idea that ‘fairness’ must prevail, even though it does not translate into equality. This mirrors the popular hype over exams being seen as a panacea for success in the 1930s, where the harsh reality of the colonial rule was brushed under the carpet and the mantra of ‘success achieved through one’s hard work’ heavily hung above everyone’s heads. 이 글은 오늘날 만연한 능력주의의 역사적 기원을 식민지 시기 대중의 의식 속에서 찾는 것을 목적으로 한다. 이를 위해 1936년 조선일보 에서 개설한 <독자 사교실>의 사연들을 여러 항목으로 분류하고 직업과 진로, 학력, 수험, 진로 등에 대한 내용을 중심으로 당대 독자 대중의 의식을 분석했다. 사회의 변화에 대한 진보적 희망이 좌절된 상황에서 권력과 자본이 제시한 성공의 길에 엘리트가 되기를 열망하는 청년들이 몰려 들었다. 그러나 실제 성공의 가능성은 극히 낮았다. 조선인들이 바늘구멍 같은 자격시험들을 통과하기는 극히 어려웠다. 이들은 의식적으로 차별의 현실을 외면하고, <노력-성공-입신출세>의 길을 고집했지만, 실제로는 고립된 청년들이 꿈꾸던 현실의 탈출구는 없었다. 이 시기 다른 청년들이 보여주는 무모할 정도로 집요한 ‘문예’에 대한 열망 또한 이 고립된 욕망과 동전의 반대면 같은 것이었다. 학력과 시험 제도로 포장하여 제시된 성공의 사례들은 실제 도달할 수 없는 곳에 있었다. ‘공정’이 평등하지 않더라도 무엇보다 우선되어야 한다고 집착하는 오늘날 한국의 능력주의는, 식민지 현실의 차별을 외면하고 ‘(본인의) 노력을 통한 입신출세’에만 집착한 1930년대 수험만능주의와 꼭 닮았다. 그런 면에서 <독자사교실>에서 넘쳐나는 입신주의와 수험열 현상을 능력주의의 식민지적 기원이라고 보아도 될 것이다.
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Orthopantomograph에 있어서 像의 變化에 關한 硏究
李起薰 大韓顎顔面 放射線學會 1978 Imaging Science in Dentistry Vol.8 No.1
The purpose of this study is to obtain the enshortening and elongation rate of image in orthopantomograph. The subjects were consisted of 15 dry skulls attached with radiopaque materials on each anatomical points. The length measurements were performed between two points on dry skull, and between two points on film. The results are as follows: 1. The enshortening and elongation rate between two anatomical points (1) ANS↔infraorbital foramen(left: +1.3%, right: +0.7%) (2) ANS↔maxillary tuberosity(left: -11.7%, right: -14.3%) (3) Zygomatic arch length(left: -4.8%, right: -8.9%) (4) first molar↔infraorbital foramen(left: +19.8%, right: +24%) (5) inter-infraorbital foramen length(-21.4%) (6) inter-first molar length(-31.8%) (7) inter-mental foramen length(+1.4%) (8) mental foramen↔mandible angle(left: +3.3%, right: +3.3%) (9) mental foramen↔lingula(left: +8.2%, right: +3.3%) (10) mental foramen↔condyle head(left: +5.2%, right: +4.5%) (11) mandible↔condyle head(left: +15.4%, right: +16.4%) 2. The closer the object is to the occlusal plane and the median line, the smaller it appears.
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폴리에틸렌(PE) 폼 제조공정상 정전기에 의한 화재위험성 연구
이기훈,김용필,조용선,남성우 한국화재감식학회 2017 한국화재감식학회 학회지 Vol.8 No.3
Polyethylene(PE) has not only a common characteristic of plastics but also various characteristics such as chemical stability, water-proofing and foamability. But It is easy to be ignited and quickly spread in fire. Nevertheless, Because of its convenience in use and economical efficiency, It is widely used for various product in whole industry. In this study, we have conducted experiments that analyze fire risks in PE manufacturer where use LPG(Liquefied Petroleum Gas) as foaming material. According to the experiment results, Ignitable gas is emitted from PE foams at early stage of production. We verified the range of flammability which could be occurred with LPG in restricted area. Under the range of flammability, fire accident can be easily occurred with light source of ignition such as electrostatic. In conclusion, we propose the precautions for preventing fire accident and the methods for fire scene investigation.
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