• Proceedings of the KIPE Conference
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• 2001.10a
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• pp.93-97
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• 2001

A new compact, low-energy electron beam irradiator has been developed. The core-loss of silicon steels can be reduced by magnetic-domain refinement method. The irradiator was developed for the application of core-loss reduction using the method. The beam energy of the irradiator can be varied from 35 to 80 keV and the maximum current is 3mA. The irradiation area is designed to be $30\times30mm2$ now and will be upgraded to $30\times150mm2$ using a scanning magnet and scanning cone. The electron beam generated from 3 mm diameter LaB6 is extracted to the air for the irradiation of the silicon steels in the air. A special irradiation port was developed for this low-energy irradiator. A havar foil with $4.08{\mu}m$ thickness were used for the window and a cold air-cooling system keeps the foil structure by removing heat at the window. The irradiator system and its operation characteristics will be discussed.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.19 no.5
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• pp.705-709
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• 2010

It is quite complex to draw the geometry of electron trajectories in electron optics because such trajectories have various aberrations that cannot be easily calculated. However, if we need to know roughly the geometry, the focal length and the principal planes in order to understand the properties of column, a simple numerical solution can be a useful method. We are developing the electron beam machining system based on SEM. In this paper, we show rough geometry, focal length and principal planes by a numerical solution for electron lens I in our column. These results will be utilized in developing a simulation program for electron optics.

• Journal of the Korean Society for Heat Treatment
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• v.23 no.4
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• pp.205-209
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• 2010

Transparent and conductive AZO films were deposited on the glass by using radio frequency (RF) magnetron sputtering with intense electron radiation, simultaneously. After deposition, the effect of electron radiation energy on the optical and electrical properties of AZO was investigated. In XRD measurements, the films irradiated with intense electron beam show the larger grain size than that of the films prepared without electron radiation. Sheet resistance was also dependent on the electron radiation energy, while the optical transmittance in visible wavelength region was not affected seriously by electron radiation. X-.ray diffraction, UV-Vis spectrophotometer and four point probes were used to observe the crystallization, optical transmittance and sheet resistance, respectively.

• Journal of Korean Ophthalmic Optics Society
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• v.10 no.1
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• pp.63-69
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• 2005

The effects of R products of B company and natural disinfectant naringin, well-known chemical disinfectant on Corneal endothelium and epithelium of rabbit were observed by scanning electron microscope. The main component of naringin is extract of grapefruit seed, which is one of the flavonoid widely recognized as natural antioxidants and used as preservative agent of food and cosmetics. The chemical disinfectants cytotoxicity in cell cultures were announced by MIT assay and LDH leakage assay. But there has been no study about that chemical disinfectants and natural disinfectants is inserted drops on rabbit's cornea directly. In this test R products B company and natural disinfectants has been dropped on the cornea of rabbits for one weeks and observed cytotoxiciy by light camera after rose bengal staining. Also, we analysed the damage of corneal epithelium and endothelium morphologically after enucleating the cornea by scanning electron microscope.

• Applied Microscopy
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• v.37 no.3
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• pp.199-208
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• 2007

We have made an optical device to study the wave optics phenomena, such as image and diffraction pattern, constructive and destructive interference, by direct operation of laser beam and optical lenses. It consists of laser beam, goniometer, objective lens, intermediate lens, projection lens, CCD system, and computing system. As a result of the performance test, we were able to magnify samples up to 44 times with the resolution of about $5{\mu}m$. It is expected to help EM users understanding more easily principles of transmission electron microscopy (TEM).

• Bulletin of the Korean Chemical Society
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• v.30 no.5
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• pp.1067-1070
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• 2009

We studied change in water contact angle on $TiO_2$ surfaces upon high-energy electron-beam treatment. Depending on conditions of e-beam exposures, surface OH-content could be increased or decreased. In contrast, water contact angle continuously decreased with increasing e-beam exposure and energy, i.e. change in the water contact angle cannot be rationalized in terms of the overall change in the surfacestructure of carbon-contaminated $TiO_2$. In the C 1s spectra, we found that the C-O and C=O contents gradually increased with increasing e-beam energy, suggesting that the change in the surface structure of carbon layers can be important for understanding of the wettability change. Our results imply that the degree of oxidation of carbon impurity layers on oxide surfaces should be considered, in order to fully understand the change in the oxide surface wettability.

• Journal of Radiation Industry
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• v.3 no.1
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• pp.1-5
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• 2009

The variation of MgO surfaces, in which fluorine was contained (F-MgO), by high energy electron-beam (EB) was studied using X-ray photoelectron spectroscopy (XPS). Fluorine on the MgO surface was eliminated by EB treatment with the consequence that the electronic structures of Mg, O and C were varied. Moreover, as a result of oxidation of carbon species on the surface by high dose EB treatment (90 kGy), the concentration of carbonate and carboxyl species on the surface was increased. In this experiment, it was confirmed that the structure of oxidized metal surface can be adjusted by varying conditions of EB treatment (energy and dose). This result implies that EB can be applied for developing new catalysts.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.489-490
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• 2008

As anodizing method using poly-Si (polycrystalline silicon) grown by LPCVD (Low Pressure Chemical Vapor Deposition), a ballistic electron emitter was made. An OPPS (Oxidized Porous Poly-Si) structure can generate ballistic electron which can pass through without scattering owing to electric field of oxide layer wrapped around nanocrystal due to applied voltage of between surface and bottom electrode. As electrode, (Al, Au and Pt/ti) were used. In this case, there were the better characteristics in Al and Pt/ti than in Al and Au.

• Proceedings of the Optical Society of Korea Conference
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• 2002.11a
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• pp.96-97
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• 2002

• Applied Microscopy
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• v.4 no.1
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• pp.35-38
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• 1974