• The Korean Journal of Zoology
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• v.37 no.2
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• pp.144-155
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• 1994

마이크로파 에너지로서 현미경 관찰을 위한 생체물질을 고정할 때, 고정효과는 화학 고정액을 사용할 때와 비교하여 보다 우수한 또는 적어도 동일한 고정효과를 볼 수 있다는 것은 알려진 사실이다. 그러나 기존의 마이크로파 오븐을 사용하여 생체물질을 고정하면 고정 정도에 일정성이 없는데, 이는 마이크로파가 균일하게 조사되지 않고 고정에 적절하도록 마이크로팍의 강도를 조절하기 어려우며, 이로 인하여 정확한 고정온도의 측정이 불가능하기 때문으로 생각된다. 이 연구에서는 마이크로파가 조사되는 동안 시료의 온도를 측정할 수 없는 기존의 마이크연.파 오븐의 단점을 보완하기 위하여 비접촉식 적외선 온도 감응기를 장착한 마이크로파 오븐을 개발하였으며 고정효과를 관찰하기 위하여는 포유류의 기준 조직으로 알려진 생쥐의 신장을 고정하였다 고정효과는 전체적인 구조와 세부 구조의 보존이 모두 우수하였고 최적의 고정온도는 28$\pm$1$^{\circ}C$(완충용액 20 ml, 10초) 이었다. 이와같이 고정된 재료는 고정효과 뿐만 아니라 염색성이 좋아서 조직화학 반응이 우수하고, 냉동절편법과 연계했을 때 전체 절편제작 과정이 2~4시간 내에 완료될 수 있었다 이때 절편의 질(질)은 화학 고정액이나 냉동절편 법에 의하여 제작된 것 보다 우수하였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1999.05a
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• pp.477-480
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• 1999

III-V족 화합물 반도체인 p-CaP의 자연산화막윽 30% $H_2O$$_2$용액 내에서 화학적인 이온반응을 통한 전기분해의 원리를 이용한 양극산화방법으로 형성하여 그 성장률과 광학적성질을 조사하였다. GaP자연산화막의 형성은 산소의 확산과정으로 이루어지며, 양측산화 막의 두께는 산화시간과 인가전압에 대하 여 선형적으로 비례하여 증가하였다. 자연산화막의 표면은 전자현미경으로 산화막의 두게는 파장이 6328$\AA$인 Ellipsometer를 사용하여 측정하였다. 광학적 성질은 적외선 영역에서의 광흡수 특성은 퓨리에 적외선 분광기로 측정하였으며 XRD 로 전압과 시간에 따른 산화막에 조성과 결정면을 알아보았다. 산화막의 형성방법과 형성조건에 따른 GaP 자연산화막의 절연막으로 이용하여 산화막에 조성에 따른 MOS 다이오드로서의 이용 가능성을 조사하였다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.2
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• pp.999-1004
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• 2011

In this study, nanodiamod's surface have formed carboxyl, hydroxyl, amine radical for the purpose of use of nanodiamond synthesized by detonation, and then it has widely stable dispersion and slowly sedimentation in solvent. Thus nanodiamonds obtained by chemical treatment were used to analyze the structure, surface statement, particle size and sedimentation specification in solvent for method X-ray diffration(XRD), scanning electron microscope energy diffraction spectroscopy(SEM-EDS), Fourier transform infrared spectroscopy (FTIR), automic force microscope(AFM).

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1996.05a
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• pp.23-26
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• 1996

고주파 스퍼터링 방법에 의하여 상온에서 Si(100)기판 위에 AIN막을 형성하였다. 기판의 온도, 고주파 출력, 스퍼터링 시간, 질소의 비율을 변화인자로 해서 각 조건하에서 제작된 AIN의 결정질을 X선 회절법, 적외선 분광법, 전자현미경으로 상호비교 하였다. 자외선 투과법에 의해, 제작된 AIN 막의 금지대 폭은 4.27eV 이었다. 질소 비율에 따른 AIN 막두께의 변화는 질소비율 40∼60%에서 급격하게 일어났다.

• Proceedings of the Optical Society of Korea Conference
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• 2000.08a
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• pp.50-51
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• 2000

최근에 결상광학계는 광학유리를 사용한 전통적인 단순 구면형에서 플라스틱, 금속 등의 소재와 비구면 혹은 홀로그래피 광학소자를 이용한 복합적 기능형으로 발전하고 있다. 또한 엑스선에서 적외선까지 매우 넓은 분광영역에서 현미경으로 관찰할 수 있는 미소광학소자부터 구경 10 m 정도의 대구경 망원경까지 다양한 크기의 초정밀 결상광학계가 계속 개발되고 있다. 즉 구경 100 mm 정도의 구면 광학계에서 광대역 분광영역의 대구경 비구면 광학계로 발전하고 있다.$^{(1)}$ (표 1 참조) (중략)

• Journal of the Korean Vacuum Society
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• v.18 no.2
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• pp.108-115
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• 2009

The superlattice infrared photodetector (SLIP) with an active layer of 8/8-ML InAs/GaSb type-II strained-layer superlattice (SLS) of 150 periods was grown by MBE technique, and the proto-type discrete device was defined with an aperture of $200-{\mu}m$ diameter. The contrast profile of the transmission electron microscope (TEM) image and the satellite peak in the x-ray diffraction (XRD) rocking curve show that the SLS active layer keeps abrupt interfaces with a uniform thickness and a periodic strain. The wavelength and the bias-voltage dependences of responsivity (R) and detectivity ($D^*$) measured by a blackbody radiation source give that the cutoff wavelength is ${\sim}5{\mu}m$, and the maximum Rand $D^*$ ($\lambda=3.25{\mu}m$) are ${\sim}10^3mA/W$ (-0.6 V/13 K) and ${\sim}10^9cm.Hz^{1/2}/W$ (0 V/13 K), respectively. The activation energy of 275 meV analyzed from the temperature dependent responsivity is in good agreement with the energy difference between two SLS subblevels of conduction and valence bands (HH1-C) involving in the photoresponse process.

• Journal of the Microelectronics and Packaging Society
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• v.22 no.4
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• pp.31-36
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• 2015

The demand for multi-functionality, high density, high performance, and miniaturization of IC devices has caused the technology paradigm shift for electronic packaging. So, thermal management of new packaged chips becomes a bottleneck for the performance of next generation devices. Among various thermal solutions such as heat sink, heat spreader, TIM, thermoelectric cooler, etc. on-chip liquid cooling module was investigated in this study. Micro-channel was fabricated on Si wafer using a deep reactive ion etching, and 3 different micro-channel designs (straight MC, serpentine MC, zigzag MC) were formed to evalute the effectiveness of liquid cooling. At the heating temperature of $200^{\circ}C$ and coolant flow rate of 150ml/min, straight MC showed the high temperature differential of ${\sim}44^{\circ}C$ after liquid cooling. The shape of liquid flowing through micro-channel was observed by fluorescence microscope, and the temperarue differential of liquid cooling module was measuremd by IR microscope.

• Journal of the Microelectronics and Packaging Society
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• v.22 no.2
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• pp.27-31
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• 2015

Thermal management becomes a key technology as the power density of high performance and high density devices increases. Conventional heat sink or TIM methods will be limited to resolve thermal problems of next-generation IC devices. Recently, to increase heat flux through high powered IC devices liquid cooling system has been actively studied. In this study a chip-level liquid cooling system with TSV and microchannel was fabricated on Si wafer using DRIE process and analyzed the cooling characteristics. Three different TSV shapes were fabricated and the effect of TSV shapes was analyzed. The shape of liquid flowing through microchannel was observed by fluorescence microscope. The temperature differential of liquid cooling system was measured by IR microscope from RT to $300^{\circ}C$.

• Analytical Science and Technology
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• v.32 no.6
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• pp.243-251
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• 2019

Microplastics (MP) are found in large quantities in the oceans, posing a major threat to the ecosystem. In Korea, MPs have been reported to be detected in sea salts. In order to analyze MPs, information on their composition, size, and shape is required. FT-IR microscopy is used frequently to measure sizes larger than 20 ㎛. Recently, however, Raman microscopy, which can analyze ultrafine plastics below 20 ㎛, has been applied extensively. In this study, 10.0 g samples of commercially available salts were dissolved and filtered through a 45 ㎛ mesh filter with a size of 25.4 mm × 25.4 mm. These filtered samples were then analyzed by both FT-IR microscopy and Raman microscopy. A total of four MPs, including three polyethylene (PE) of size 70-100 ㎛ and a polypropylene (PP) of size 170 ㎛, were detected by FT-IR microscopy, while 10 MPs, including nine PE of size 10-120 ㎛ and one polystyrene (PS) of size 40 ㎛, were detected by Raman microscopy. Approximately, 1,000 MPs/kg was estimated, which was almost two times higher than the previous reported levels (~550-681 particles/kg in sea salts); this is because Raman microscopy can detect much smaller MPs than FT-IR microscopy. A total of 113 particles were found using Raman microscopy: Carbon (35, 31.5 %), minerals (28, 25 %), and glass (16, 14.4 %) were dominant, forming around 70% of the total, but MPs (10, 8.8 %) and cellulose (5, 4.5 %) were also found. Raman microscopy has great potential as an accurate method for measuring MPs, as it can measure smaller size MPs than FT-IR microscopy. It also has a reduced sample preparation time.

• Korean Journal of Materials Research
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• v.4 no.4
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• pp.477-482
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• 1994

Structural changes of hydrous titania by heat-treatment was investigated with XRD, TEM, FT-IR, Rarnan spectral analyses. The hydrous titania was derived from a mixed solution of titanium tetrachloride and hydrogen peroxide at $30^{\circ}C$ and pH of 9.0. The precipitate was an anatase form of titania with less-developed crystalline structure. With increasing annealing temperature ranglng up to $700^{\circ}C$, the crystallinity of anatase increased, and the particles were grown at high temperature. The rutile form of titania was developed from the anatase at $700^{\circ}C$.