• Journal of Veterinary Clinics
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• v.24 no.1
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• pp.42-45
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• 2007

The genus Proteus has been rarely isolated from cultured fish. In this study, we reported Proteus vulgaris isolated from fish skin lesion of Black-spotted porcupine fish (Diodon hystrix). Identification of f vulgaris was performed by general biological test, including API 20E and API ZYM. The sensitivity of isolated strains to different groups of antibiotics was evaluated using the disc diffusion method. It showed that the isolate is sensitive to ciprofloxacin $(5{\mu}g)$, norfloxacin $(10{\mu}g)$, enrofloxacin $(5{\mu}g)$, cefotaxime $(30{\mu}g)$.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.990-994
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• 2005

MBE growth conditions such as growth temperature, flux ration and growth rate for II-VI compound semiconductor growth has been studied. The growth temperature, flux ration and growth rate were tentatively controlled to 290$^{\circ}C$, 2, and 0.6 ${\mu}m$/h, respectively. From AFM result, relatively rough surface (RMS ${\sim}$ 2.9 nm) was observed. It was regarded as an indication of low growth temperature and high growth rate. XRD measurement shows that the film is relaxed, also the series of XRD measurements of different diffraction planes such as (002), (004), (115), (006) diffractions were performed to calculate the dislocation density in the film. The calculated dislocation density was found to be 8.30${\times}10^8$ dis/cm$^2$ which is compatible to the previous results.

• Korean Journal of Food Science and Technology
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• v.31 no.3
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• pp.751-756
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• 1999

The inhibitory effect of antibiotics on growth of lactobacillus, streptococcus and bifidobacteria was examined to develop the selective media to isolate and enumerate bifidobacteria from the fermented foods containing various lactic bacteria. The growth of lactic bacteria was inhibited seriously but that of bifidobacteria was not inhibited by gentamycin or ripampicin at the concentration of more than $100\;{\mu}g/mL$. However lactic bacteria did not grow in MRS broth containing $50\;{\mu}g/mL$ of ampicillin and the growth inhibition of bifidobacteria occurred. The growth inhibition of bifidobacteria was more severe than lactic bacteria in $100\;{\mu}g/mL$ of fosfomycin. Therefore, the MRS medium containing $80\;{\mu}g/mL$ of neomycin sulfate, $50\;{\mu}g/mL$ of gentamycin, $50\;{\mu}g/mL$ of rifampicin, $15\;{\mu}g/mL$ of nalidixic acid and $3\;{\mu}g/mL$ of lithium chloride was concluded selective for bifidobacteria, but restrictive for the other lactic bacteria present in Kimchi and cheese.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.40 no.3
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• pp.163-171
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• 2003

To evaluate the performance of the digital radiography(DR) system developed in our group, the modulation transfer function(MTF) was measured and compared with that of an analog X- ray detector, film/screen system. The DR system has an amorphous selenium(a-Se) layer vacuum-evaporated on a TFT flat panel detector. The speed class 400 film/screen (Fuji) system has been being used in the clinical field as analog X-ray detectors. Both the square wave and slit method were used to evaluate their MTF. The square method was applied to both film/screen and the DR system. The slit method, however, was applied to only DR system. The full-width half maximum resolution of film/screen was 357${\mu}{\textrm}{m}$(1.4 lp/mm at 50% spatial frequency), and the resolution of DR was limited to 200${\mu}{\textrm}{m}$(2.5 lp/mm at 30%). These results indicate the measured resolution limitations approximate to the pixel pitch, 139 ${\mu}{\textrm}{m}$ of TFT. The MTF of DR is higher than that of film/screen by the factor of 1.785. It is proved that our a-Se based DR system has potential usefulness in the clinical field.

• Restorative Dentistry and Endodontics
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• v.32 no.4
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• pp.327-334
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• 2007

The purpose of this study was to evaluate the effect of burs on microleakage of Class V resin restorations when a self-etching primer adhesive was used. Forty Class V cavities were prepared with four different cutting burs on extracted third molars, and divided into one of four equal groups (n = 10); Group 1-plain cut carbide bur (no. 245), Group 2-cross cut carbide bur (no. 557), Group 3-fine diamond bur (TF-21F), Group 4-standard diamond bur (EX-41). The occlusal and gingival margin of cavities was located in enamel and dentin, respectively. Cavities were treated with Clearfil SE Bond and restored with Clearfil AP-X. Specimens were thermocycled, immersed in a 2% methylene blue solution for 24 hours, and bisected longitudinally. They were observed leakages at enamel and dentinal margins. Data were analyzed using Mann-Whitney and Wilcoxon signed ranked test. The results of this study were as follows; 1. At enamel margin, microleakage of group 4 was statistically higher than those of group 1, 2 and 3 (p < 0.01). 2. At dentinal margin, microleakage of group 4 was statistically higher than group 3 (p < 0.01), but group 1 and 2 were not statistically different with group 3 and 4. 3. Enamel microleakage was statistically higher than dentinal microleakage in group 1, 2 and 3 (p < 0.05), but statistical difference between the microleakage of enamel and dentinal margin was not in Group 4. In conclusion, the use of coarse diamond bur showed high microleakage at both enamel and dentinal margin when Clearfil SE Bond was used in class V cavity.

• Journal of Biomedical Engineering Research
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• v.28 no.2
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• pp.306-309
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• 2007

PXLM(Phosphor based x-ray light modulator) has a combined structure by phosphor, photoconductor, and liquid crystal and it can realize x-ray image of high resolution in clinical diagnosis area. In this study, we fabricated a photoconductor and investigated electrical and optical properties to confirm application possibility of radiator detector of PXLM structure. As photoconductor, amorphous selenium(a-Se), which is used most in DR(Digital radiography) of direct conversion method, was used and for formation of thin film, it was formed as $20{\mu}m-thick$ by using thermal vacuum evaporation system. For a produced a-Se film, through XRD(X-ray diffraction) and SEM(Scanning electron microscope), we investigated that amorphous structure was uniformly established and through optical measurement, for visible light of 40 $0\sim630nm$, it had absorption efficiency of 95 % and more. After fabricated a-Se film on the top of ITP substrate, hybrid structure was manufactured through forming $Gd_2O_3:Eu$ phosphor of $270{\mu}m-thick$ on the bottom of the substrate. As the result to confirm electrical property of the manufactured hybrid structure, in the case of appling $10V/{\mu}m$, leakage current of $2.5nA/cm^2$ and x-ray sensitivity of $7.31nC/cm^2/mR$ were investigated. Finally, we manufactured PXLM structure combined with hybrid structure and liquid crystal cell of TN(Twisted nematic) mode and then, investigated T-V(Transmission vs. voltage) curve of external light source for induced x-ray energy. PXLM structure showed a similar optical response with T-V curve that common TN mode liquid crystal cell showed according to electric field increase and in appling $50\sim100V$, it showed linear transmission efficiency of $12\sim18%$. This result suggested an application possibility of PXLM structure as radiation detector.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.178.6-178
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• 2001

Silicon-micromachined microneedle for a biofluid diagnosis system is developed. To fabricate microneedles, two sets of processes are used. One is making buried microchannels in silicon wafer using silicon isotropic etch with a SF6 plasma and then trench-refilling. The other is releasing the body of the microneedle by deep silicon etch. The microneedle has a 4 mm-length and about 12 $\mu\textrm{m}$ diameter buried microchannel, a 1.5 mm$\times$l.5 mm-area reservoir, and about 180 $\mu\textrm{m}$thickness body. Preliminary results indicate that microneedles are capable of flowing fluidic samples. The microneedle with a buried microchannel is expected to be integrated with in vitro diagnosis systems and microfluidic devices.

• Proceedings of the Optical Society of Korea Conference
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• 2007.02a
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• pp.143-144
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• 2007

낮은 포논 에너지를 가지는 대표적인 비정질 광소재인 Ge-Ga-Sb-Se 조성의 셀레나이드 유리에 CsI를 첨가한 찰코할라이드 유리 샘플을 제작하고 CsI 함량에 따른 소재의 광 특성 및 첨가된 $Pr^{3+}$ 이온의 광 특성 변화를 조사하였다. 안정한 비정질 상태를 유지하는 CsI의 함량은 약 7.5 몰%로 제한되었으며, 첨가량에 비례하여 단파장 흡수단 파장이 짧아지는 경향을 보였으나 weak absorption tail이 증가 하였다. $Pr^{3+}$ 이온으로부터 발생하는 1.6 ${\mu}m$대역 형광의 제반특성은 CsI의 첨가와 비교적 무관한 것으로 밝혀졌으며 1.06 ${\mu}m$장에서 측정한 비선형 흡수 계수 역시 CsI의 첨가에 영향을 거의 받지 않는 것으로 판명되었다.

• KIEE International Transactions on Electrophysics and Applications
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• v.5C no.5
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• pp.183-190
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• 2005

In order to drive the high-density plasma displays, a high-speed driving technology must be researched. In this experiment, the relationship between the width of the address electrode and high-speed driving is analyzed using the Vt close curve and the panel structure for high-speed driving is proposed. In addition we show that the wider the width of the address electrode is, the narrower the width of the scan pulse becomes. Therefore, we could achieve the minimum data voltage of 50.1V at a scan pulse width of $1.0/{\mu}s$ and a ramp voltage of 210V at an address electrode width of $180/{\mu}m$ for the high-speed driving 4-inch test PDP.

• Journal of Korea Multimedia Society
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• v.10 no.3
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• pp.391-400
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• 2007

According to the recent advances in multimedia computing, storage and searching technology have made large volume of music contents become prevalent. Also there has been increasing needs for the study on efficient categorization and searching technique for music contents management. In this paper, a new classifying method using the local information of music content and music tone feature is proposed. While the conventional classifying algorithms are based on entire information of music content, the algorithm proposed in this paper focuses on only the specific local information, which can drastically reduce the computing time without losing classifying accuracy. In order to improve the classifying accuracy, it uses a new classification feature based on music tone. The proposed method has been implemented as a part of MuSE (Music Search/Classification Engine) which was installed on various systems including commercial PDAs and PCs.