FIB를 이용한 나노가공공정 기술 개발

최헌종,강은구,이석우,홍원표 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-

The application of focused ion beam (FIB) technology in micro/nano machining has become increasingly popular. Its use in micro/nano machining has advantages over contemporary photolithography or other micro/nano machining technologies, such as small feature resolution, the ability to process without masks and being accommodating for a variety of materials and geometries. This paper presents that the recent development and our research goals in FIB nano machining technology are given. The emphasis will be on direct milling, or chemical vapor deposition techniques (CVD), and this can distinguish the FIB technology from the contemporary photolithography process and provide a vital alternative to it. After an introduction to the technology and its FIB principles, the recent developments in using milling or deposition techniques for making various high-quality devices and high-precision components at the micro/nano meter scale are examined and discussed. Finally, conclusions are presented to summarize the recent work and to suggest the areas for improving the FIB milling technology and for studying our future research.

고속 HMC 이송계의 운동특성 평가 및 운동오차 예측

최헌종,허남환,강은구,이석우,홍원표 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-

Recently, the evolution in production techniques (e.g. high-speed milling) and the complex shapes involved in modern production design has been increasingly popular. The key to the achievement is a drastic improvement of the dynamic behavior of the machine tool axes used in production machinery. The more complex these tool paths the higher the speed and acceleration requirements. But it is very difficult to reach the target for high speed machine tool because of the limitations of servo system and motion control system. However the direct drive design of machine tool axes, which is based on linear motors and which recently appeared on the market, is a viable candidate to meet the ever increasing demands, because of these advantages such as no backlash, less friction, more mechanical simplicity and very higher acceleration and velocity comparing to the traditional system. This paper focused on the performance tests of the high speed horizontal machine tool based on linear motor. Especially, dynamic characteristics were investigated through circular test and circular form machining test is carried out considering many important parameter. Therefore these several experiments is used to be evaluated the model for prediction of circular motion error and circular machined error.

海外 韓國獨立運動團體의 初期統合運動에 관한 小考(1913~1923)

秋憲樹 연세대학교 행정대학원 1974 延世行政論叢 Vol.2 No.-

高麗前期의 3品 3等 田品制

윤한택 翰林大學校 泰東古典硏究所 1993 泰東古典硏究 Vol.10 No.-

LANDSTAT 자료를 이용한 유출곡선지수의 추정

조홍제,황재호 울산대학교 2001 공학연구논문집 Vol.32 No.1

수치고도모델을 이용하여 유역의 지형학적 특성을 분석하고, LANDSAT 위성영상을 이용하여 유역의 토지피복상태를 분류한 후 유출곡선지수를 추정하였다. 특히, 우리나라는 유역의 대부분을 산림이 차지하는 피복특성이 있으므로 식생의 다중반사특성을 응용하여 산림지역을 분류하고 유출곡선지수 추정에 응용하였다. 산림지역은 식생의 건강 상태나 밀도에 따라 유출특성이 변화하는데, LANDSAT 위성영상의 다중분광자료를 사용하여 산출한 식생지수는 산림지역을 밀도나 건강상태에 따라 분류하는데 유용하였다. 또한 식생지수를 사용하여 산림지역을 분류한 후 산출한 유출곡선지수는 산림지역을 분류한 후 산출한 유출곡선지수에 비하여 감소하는 것을 확인할 수 있었다. Having analyzed the topographical quality of the basin using Digital Elevation Model and classified land uses by LANDSAT Satellite image, we estimated Runoff Curve Numbers. Most of the basins are characterized by the forest, therefore multiple reflex qualities were used to classify the forest and to estimate Runoff Curve Numbers. Because runoff changes according to the vegetative health and density, the vegetation index derived from the multispectral data of LANDSAT satellite images was useful to classify the forest by its health and density. It was observed that Runoff Curve Number decreased when the vegetation index was taken into account. In conclusion, the mulispectal image was useful to observe special quality and classification of the land.

『유령선』의 탈식민주의적 읽기

손홍일 한국현대영어영문학회 2002 현대영어영문학 Vol.46 No.3

The relationship between postcolonialism as a critical discourse and African American literary studies has been complicate and often attenuated. One of the reasons is that some aspects of the African Americans' historical experience do not correspond to those of other Third World peoples. Another reason is that postcolonial discourse as practiced by current well-known scholars shows a tendency of universalization, which refuses to recognize local differences. Nevertheless, there has been a long history of "internal colonialism" approach to the African American experience. Partly because of this, scholars now pay increasingly more attention to the potentiality of grafting postcolonialism to the study of African American literature. LeRoi Jones is generally regarded as the leading figure in the Black Arts Movement. The Movement can be seen as the peak of the "inner colonialism" approach to the African Americans' historical experience and cultural practices. The Movement was sparked by Jones' calling for Black Revolutionary Theater, which emphasized contribution to black liberation through functional and committed are. Jones' Dutchman was written and produced just before he started the crusade and, thus, warrants a postcolonial reading. The interaction between the white woman Lula and the black man Clay in Dutchman can be read as an enactment of the "imperial gaze" and accompanying "conversion" and "mimicry." The imperial gaze carries authority and power which make the colonial subject powerless. Conversion in colonial context refers to the process whereby the colonized appears to accept the imperial view, values, and cultural expectations. Homi Bhabha introduced the concept of mimicry to foreground the feeling of resistance concealed in conversion and its subversive potential. In their interactions, Lula assumes the invulnerable position of the imperial observer that affirms the binary structure of power, offering reward and punishment to Clay according to his response to her demands.

李光洙 小說의 男主人公 硏究

愼憲縡 한양대학교 한국학연구소 1986 韓國學論集 Vol.9 No.-

This submission has been prepared after study of Lee, Kwang-Su's novels, is Which I tried to investigate some interior self-conflicts of the maleprotagonists, and to classify into several human types. In the 1910's, the male protagonists in the novel were filled with some self-conflicts in their conscience caused from two factors, the need of self-achievemtns and devotion for their father-land. The representative Characteristics in his novel is Lee, Hyoung-Sik, in<Moo-Jeong> (the Heartlessness) which is later classified to the patriot-type and the artist-type. In the 1920's, the heroes in the Lee, Kwang-Su's novel also possessed this sort of conscious self-coflicts caused from affection (情) and frate-rnities (義), which can be classified into four types, 가, 나, 다 and mixture of two other factors. 가) type used to over indulge in their own selfish-love and he was in different to the dark situaion of his father land occupied by the Japa-nese colonial invision, however, this male-protagonist came to regret his faults after some bitter experience by his lover's betrayal. The author, Lee, Kwang-Su, attempted to demonste the typical mail intelil-gences who used to fall into the mammonism and sexual epicurism prevailed afthe the 3.1 Indipendence Movement. 나) style was a married, middle-aged man who was at a leading level of the Korean society and was fall in love with a young lady. He tried to give up his passin to her, but after all he chose suicide to give up his ideal lover forever. 다) type is a revolutionist or patriot who sacrificed himself for the fatherland through which the author described his theory of preparative to the independence. The mixture type is a autobiographic hero, who combined two types Especially the author appealed his best ideal type through the hero An, Bin in <Sarang> <love>. Finally, we can find the heroes in Lee, Kwang-Su's novels have been working to moral-utopia, wandering ceselessly between affection (情) and fraternities(義).

光陵의 蝶相 : 特히 季節的 消長에 대하여

金憲奎,申裕垣 이화여자대학교 한국문화연구원 1959 韓國文化硏究院 論叢 Vol.1 No.-

1. Sixty-five species were known from this area by 1932 with no additional species being reported to date. 2. In order to clarify the fauna, the authors made one full year's collection from October, 1958 to October, 1959. Thirty-two species are added to the fauna of Kwangnung, raising the number of species to ninety-seven. 3. Weekly collections were made by the authors along several preset courses in order to cover the area adequately as shown on the map. Collections were made as recorded in the following table: 1958 1959 month Oct Apr May June July Aug Sept Oct date 24 12, 1819, 25 2, 9, 1512,28,30 12, 1320, 28 5, 1125 2, 1624, 30 13, 2027 4, 25 4. The species were grouped in four categories according to the number of specimens appearing in our collections. The following table presents the numbers of species in each categories: A=most abundant - 22 species B=common - 16 ˝ C=rare - 15 ˝ D=very rare - 38 ˝ 5. The greatest numbers for most species were collected in June, with fewer in May, August, and July respectively.

等分布 荷重을 받는 變斷面 보의 靜的 解析

李炳求,金憲相,牟正萬 圓光大學校 1992 論文集 Vol.26 No.2

이 論文은 等分布荷重이 작용하고 있는 變斷面 보의 靜的 解析에 관한 연구이다. 보의 변단면은 均一幅 變化높이의 矩形斷面으로 採擇하고 微少 처짐理論에 의한 휨-曲率 관계식을 이용하여 변단면 보의 정적 擧動을 지배하는 微分方程式을 유도하고, 이를 부정적분하였다. 미분방정식에 포함되어 있는 모멘트반력, 垂直反力 및 적분상수는 보의 端部條件에 의하여 결정하였다. 실제의 변단면 보의 해석에서는 힌지-힌지보, 힌지-固定보, 固定-固定보, 고정-힌지보, 固定-自由보의 단부조건을 택하였다. 수치 예의 결과로 斷面比와 모멘트반력, 수직반력, 최대 처짐 및 최대 綠端應力과의 관계를 그림에 나타내었다. 또한 휨 모멘트도 및 彈性曲線의 예를 그림에 나타내었다. An analytical method was developed to solve the tapered beams subjected to uniform loads. The rectangular cross-section with constant width and variable depth, so-called depth taper, was chosen. The differential equation of deflected beams based on the small deflection theory was derived and solved by indefinite integration. The unknown parameters and integral constants were calculated by the boundary conditions. The hinged-hinged, hinged-clmped, clamped-clamped clamped-hinged and clamped-free beams were considered in the numerical examples. As the results of this study, the reaction moments of left ends, the vertical reactions of left ends, the maximum deflection and the maximum stresses versus section ratios were presented in figures. Also both typical bending moment diagrams and deflection curves were presented in figures. It is expected that the results of this study including both all equations and figures can be used in design of the tapered beams.

無等山 一帶의 蝶相

崔榮福,金憲奎,吳永男 조선대학교 기초과학연구소 1981 自然科學硏究 Vol.4 No.1