• 천문학회보
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• 제37권1호
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• pp.50.2-50.2
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• 2012

We present the results of near infrared (2.5-5 micron) spectroscopy of nearby luminous infrared galaxies (LIRGs) using AKARI. The LIRG catalog is constructed from the cross-correlation between the Infrared Astronomical Satellite and the Sloan Digital Sky Survey data, and optically non-Seyfert type LIRGs are selected for main targets. We search for optically elusive active galactic nuclei (AGNs), based on the strengths of 3.3 micron polycyclic aromatic hydrocarbon emission and dust absorption features at 3-4 micron. We investigate the hidden AGN fraction as a function of the infrared luminosity and correlation between optical and near infrared star formation indicators.

• 천문학회보
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• 제37권1호
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• pp.102-102
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• 2012

타이탄의 근적외선 영역 스펙트럼에서 나타나는 특유의 넓은 흡수밴드를 고체 탄화수소화합물과 질소화합물의 조합으로 설명하고자 한다. 이 흡수 밴드는 대기권의 하층부에 존재하는 연무(haze)에 의한 것으로, 3.3 - 3.4 micron 부근과 2.30 - 2.35 micron 부근에서 유사한 형태가 발견됐다. 두 파장대 모두 C-H 스트레칭 모드가 존재하는 영역이라는 공통점이 있으며, 그 형태가 넓은 흡수밴드로 나타나므로 대기 중에 고체상태의 탄화수소화합물이 존재하는 것으로 유추할 수 있으며, 관련 분자들의 실험값과 복사전달모델을 이용하여 이를 설명하고자 한다. 또한, 이 흡수밴드는 고도에 따라 그 형태와 세기가 달라지므로, 연무 입자들의 고도에 따른 수직분포 및 크기 등을 파악할 수 있다. 이 연구에서는 기존에 타이탄에서 발견된 $CH_4$, $C_2H_6$, $CH_3CN$의 고체 분광선과, 해당 영역에서 흡수선을 보이는 $C_5H_{12}$, $C_6H_{12}$, $C_6H_{14}$ 등의 고체 분광선을 이용한 모델을 Cassini 탐사선의 VIMS 관측자료로부터 유도한 파장 및 고도에 따른 광학적 깊이 변화량과 비교하여 보여주고자 한다.

• 대한기계학회논문집B
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• 제24권8호
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• pp.1069-1076
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• 2000

As the environmental problems grow, the regulation of the pollutants emitted from power plants increases. Most of the pollutants in particle phase are removed by particle removal facilities, but fine particles between 0.1 micron and I micron in diameter have a low removal efficiency compared to particles in other size ranges. Therefore the present concern has concentrated on the removal of those fine particles. The purpose of this study is to grow fine particles by condensation to the range larger than I micron. Theoretically the general dynamic equation is solved with an assumption that the particle size follows a log-normal distribution to calculate the temporal behavior of the size distribution. Experiments have been carried out to compare the results with the theoretical predictions. Particles grown by condensation are sampled by impactors and observed with SEM photographs.

• 공업화학
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• 제28권1호
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• pp.17-22
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• 2017

본 총설에서는 마이크론 사이즈 이하 제품에 대한 최적화적인 화학공정의 스케일업을 위한 전략을 소개한다. 최적화된 화학공정의 스케일업을 위해 구해야 할 스케일업 인자의 정의와 이를 도출하는 방법을 소개하였으며, 특히 무반응 시스템, 유반응 시스템으로 분류하여 각각에 대해 서로 다른 스케일업 인자를 찾은 기준을 소개하고, 예시를 들어 논의하였다. 본지에서 소개된 스케일업 인자를 구하는 방법론이 마이크론 사이즈 이하 제품에 대한 화학공정을 스케일업하고자 하는 엔지니어들에게 초기 지침서가 될 것으로 기대된다.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제50권9호
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• pp.466-470
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• 2001

We have developed a sub-micron gap fabrication technology using chemical-mechanical polishing (CMP) without /the sub-micron lithography equipments (0.18∼0.25 7m). And it has been applied to a lateral field emission device (FED), in which narrow gap distance is very important for reducing turn-on voltage. As a result, the turn-on voltage (at which the current level is 1 nA) of the fabricated device with the gap distance of 256 nm is as low as 4.0 V, which is the lowest turn-on voltage among lateral FEDs ever reported.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2005년도 춘계학술대회 논문집
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• pp.424-428
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• 2005

This paper shows a non-contact optical method to inspect micron scale parts which will be manufactured in micro-factory system. This inspection system should have some characteristics like a small size, flexibility, and high measuring speed. In the viewpoint of measuring capabilities, it also has resolution under micron scale with measuring range over millimeter scale. Two methods will be presented in this paper, one is Moire and the other is white-light scanning interferometry. Also some experimental results will be presented to show the possibilities of the proposed inspection system.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2005년도 금형가공,미세가공,플라스틱가공 공동 심포지엄
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• pp.110-113
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• 2005

In recent, various shapes of pattern in micron or nano scale are adapted in many applications due to their good mechanical or optical properties. Light guide panel (LGP) of the LCD is one of important applications for micro pattern and micro prism shape is one of the typical patterns. Many applications have the patterns on their surface and the size of the pattern keep decreasing down to the order of micron or even under micron. On the other hand, the area to be patterned keeps enlarging. These two trends in patterned products require tooling micro patterns on large surface, which has still many technical problems to be solved mainly due to pattern size and the tooling area. In this study, we fabricate prism shape of patterns using diamond cutting tool on some metal core and plastic core like PMMA Some of cutting conditions are investigated including cutting force, cutting depth and speed for different core materials.

• 천문학회보
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• 제37권1호
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• pp.100.2-100.2
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• 2012

We have investigated excitation processes of the 3-micron bands of $CH_4$, $C_2H_2$, and $C_2H_6$ over the auroral regions of Jupiter including particle bombardments, Joule heating, scattering of solar radiation, and possible chemiluminescence. We also considered possible LTE or Non-LTE conditions of these processes. We constructed particle precipitation models including $H_2$, He, H, and the hydrocarbon molecules for the atmosphere of the auroral regions. We present preliminary results from these models, and comparisons of the model results with spectroscopic observations in the 3 micron wavelength range of Jupiter.

• 대한전자공학회논문지
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• 제26권9호
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• pp.1348-1358
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• 1989

We analyzed electrostatic lens with axi-symmetic configurations using the analytic equation for a single apertured lens. The developed computer code afforded to estimate ion optical properties such as ion trajectories, aberrations and ion beam diameters, and was found to have advantages of a shorter calculation time. The calculated ion optical properties for several types of electrostatic lens were in good agreement with Burghard's ones and it was seem that 20% reduction of ion beam diameter could be obtained by the change of aperture diameters.

• 한국표면공학회지
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• 제38권5호
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• pp.198-201
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• 2005

Nickel amalgam was Prepared by the electro-deposition with mercury cathode in a modified Watts bath. Homogeneous nickel amalgam was obtained. The fluidity of the amalgam decreased gradually with increased nickel quantity and become solid finally. Nickel powders of sub-micron size were obtained by a distillation of mercury from the amalgam. The characterization of the nickel amalgam was studied by SEM and x-ray diffractometry.