• 보존과학회지
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• 제37권4호
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• pp.402-410
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• 2021

Woolen tapestry curtains possessed by the Seoul Museum of Craft Art were used to hung on the wall or used for carpets in the winter season in the late Joseon dynasty. Since similar artifacts were only used for the curtain as functional aspects, woolen tapestry curtains were a rare case. In this study, scientific analysis on the accessory ornament of woolen tapestry curtains such as components of metal accessories and frame bar were conducted with the microscope, p-XRF, and SEM. Result of frame bar pigments, organic pigments such as ink stick were likely been used in woolen tapestry curtain 1. In woolen tapestry 2, lead red (Minium) was used in the frame bar. The result of metal parts, copper, and zinc were analyzed by p-XRF. This suggests that metal accessories were crafted using brass. Frame bar of woolen tapestry curtain 2 was made of soft pine (Pinus spp.) analyzed with the scanning electron microscope. Artifacts like woolen tapestry curtains are rare in Korea and scientific analysis databases were scarce, so it is important to construct components analysis data of woolen tapestry curtains. It is expected that additional scientific analysis and interpretation on the artifact's crafting technique can be merged with the analytical data gathered in this study to be utilized on the conservation and restoration of not only woolen curtains but curtain artifacts of the late Joseon dynasty in general.

• Advances in concrete construction
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• 제15권1호
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• pp.11-22
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• 2023

Autogenous healing of concrete can be helpful in structural maintenance by healing cracks using a healing material created by the precipitation of calcite and by the hydration of unhydrated binder around the cracks. Against this backdrop, this study investigated the physicochemical properties and autogenous healing performance of ternary blended binder composed of ordinary Portland cement (OPC), blast furnace slag (BFS), and calcium sulfoaluminate (CSA) clinker. Ternary blended binders with various contents of OPC-BFS-CSA clinker were prepared, and their physicochemical properties and autogenous healing performances were examined using various analytical techniques and visually observed using a microscope. The obtained results indicated that increase in the BFS content accompanied the increased the amount of unreacted BFS even after 28 days of curing and had a positive effect on the autogenous healing performance due to its latent hydration. However, replacing the CSA clinker did not increase the autogenous healing performance owing to an insufficient sulfate source for the formation of ettringite. The main precipitates around the cracks were calcite, C-S-H. Other hydration products such as portlandite, monosulfate, and ettringite, which were not found in the Raman and scanning electron microscope analyses.

• Bulletin of the Korean Chemical Society
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• 제13권6호
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• pp.620-624
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• 1992

The analytical performance of glow discharge mass spectrometer (GD-MS), using a flat type ion source is discussed. The efficiency of ion extraction was maximized at the distance between anode and cathode of 6 mm. At the operation condition of 4 mA, -1000 volt, and 1 mbar for the source, the optimum voltages for sampler and skimmer were40 volt and -280 volt, respectively. The intensities of Cu, Zn, and Mn were increased as a function of square root of current approximately. Korea standard reference materials (KSRM) were tested for an application study. The detection limits of most elements were obtained in the range of several ppm at the optimized operating condition. The peaks of aluminum and chromium were interfered by those of residual gases. The depth profile of nickel coated copper specimens (3, 5, 10 ${\mu}m$ thickness) were obtained by plotting time versus intensities of Ni and Cr after checking the thickness of nickel coated using a scanning electron microscope (SEM). At this moment, the sputtering rate of 0.2 ${\mu}m/min$ at the optimum operating condition was determined from the slope of the plot of time to the coating thickness. The roughness spectra of specimen's crater after 16 min, discharge were obtained using a Talysuf5m-120 roughness tester as well.

• 멤브레인
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• 제18권1호
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• pp.75-83
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• 2008

본 연구에서는 Polyethylene (PE, Asahi) 이차전지용 막의 표면불소화를 통해 기계적 강도 및 열적 안정성과 고출력에서의 안정성을 높이기 위한 연구를 실시하였다. 전자주사현미경(scanning electron microscope, SEM), 접촉각(contact angle)을 통하여 불소가스 노출시간에 따른 막의 표면과 구조의 변화를 관찰하고, 인장강도와 표면 친수성 실험을 통하여 막의 기계적 물성을 확인하였다. 제조된 막의 전기화학적 특성을 확인하기 위하여 충/방전 실험, 수명특성. 고율방전시험을 실시하여 고출력에서 온도에 대한 안정성이 향상되었음을 확인하였다.

• 분석과학
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• 제15권6호
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• pp.567-573
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• 2002

국내에서 석탄을 이용하는 발전소에서 발생되는 비산회의 최대 재활용처는 콘크리트 혼화제로의 사용인데, 여기에 사용되는 비산회에 미연탄소분이 많게되면, 탄소분에 의한 콘크리트의 질 저하가 유발된다. 현재 콘크리트 혼화제로 공급되고 있는 비산회는 미연탄소분의 함량을 낮추기 위해 정제과정을 거치고 있다. 이 과정에서 발생되는 부산물인 미연탄소분은 폐기물로서 전량 매립되고 있다. 본 연구에서는 비산회로부터 부선법으로 미연탄소분을 추출 정제하고, 이 미연탄소분을 재활용하기 위한 기초 연구의 하나로 탄소분의 형태와 모양을 조사하였다. 탄소분의 형태와 탄소분에 함유된 회분의 화학적 조성특성은 주사 전자현미경과 이에 부착되어 있는 에너지 분산형 X-선 형광분석기를 이용하여 파악하였다.

• 세라미스트
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• 제10권3호
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• pp.55-66
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• 2007

Infrared Scanning Near-field Optical Microscopy (IR-SNOM) is an extremely powerful analytical instrument since it combines IR spectroscopy's high chemical specificity with SNOM's high spatial resolution. In order to do this in the infrared, specialty chalcogenide glass fibers were fabricated and their ends tapered to generate SNOM probes. The fiber tips were installed in a modified near field microscope and both inorganic and biological samples illuminated with the tunable output from a free-electron laser located at Vanderbilt University. Both topographical and IR spectral images were simultaneously recorded with a resolution of ${\sim}50\;nm$ and ${\sim}100\;nm$, respectively. Unique spectroscopic features were identified in all samples, with spectral images exhibiting resolutions of up to ${\lambda}/60$, or at least 30 times better than the diffraction limited lens-based microscopes. We believe that IR-SNOM can provide a very powerful insight into some of the most important bio-medical research topics.

• 대한기계학회논문집
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• 제3권3호
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• pp.98-103
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• 1979

The fatigue limit of an ion-nitrided steel was investigated experimentally and analytically. It is found that fatigue limit can singificantly be increased by ion-nitriding, and that the case depth is the most important parameter which determines the fatigue limit. The data indicate that fatigue limit increases with the case depth as well as the surface hardness of the nitrided steel. The fracrographs of the fracture surfaces taken by a scanning electron microscope show that the fisch-eye is located at the subsurface of failed specimens. Assuming that crack propagates from the subsurface inclusions, an analytical model is proposed to predict the fatigue limit. Taking into account the stress distrbution of a nitrided specimen, fatigue limit is predicted as a function of the case depth. The proposed semiemprical formula agrees satisfactorily with the experimental data obtained from rotating beam fatigue testing.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2004년도 Proceedings of the 4th Korea-China Joint Workshop on Nuclear Waste Management
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• pp.257-259
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• 2004

In this paper measurement method of uranium isotope ratio of uranium-bearing particles in swipe samples was introduced; Swipe sample screening program was proposed on the basis of studying various destructive assay and non-destructive assays. Scanning electron microscope(SEM) equipped with an energy dispersive X-ray fluorescence(XRF) system was applied to locate the deposited uranium-containing particles on the graphite support, particle's composition and size can be identified. Some isotope ratio results were compared with those of other bulk analytical methods; By measuring the same prepared sample, we got the U-particle isotopic ratio data similar to those from IAEA NWAL, indicating that our operation parameters and experimental conditions are viable and can be used for measurement of U-particle isotopic ratio from swipe samples.

• 한국환경독성학회:학술대회논문집
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• 한국환경독성학회 1999년도 춘계학술대회 발표논문집
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• pp.71-71
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• 1999

• 대한전자공학회논문지
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• 제22권4호
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• pp.84-91
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• 1985

열적으로 성장된 이산화실리콘 층 위에 실리카 필름 박막을 도포함으로써, 열산화막의 예각부식 공정이 제안되었다. 실리카필름의 밀화온도를 175$^{\circ}C$ 에서 1,150$^{\circ}C$로 변화시킴에 따라, $3^{\circ}$ 에서 $40^{\circ}$사이의 경사각을 얻었다. 또한 예각부식 공정의 해석적인 모형이 제시되었으며, 이산화실리콘 층의 부식단면을 기술하는 방정식이 Fermat의 최단시간 정리를 이용하여 유도되었다. 전자주사 현미경으로 부터 얻어진 부식단면과 이론적으로 계산된 단면을 비교한 결과, 서로 잘 부합되었다.