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Kim, Kwang Joo,Eom, Jung-Hye,Kim, Young-Wook,Seo, Won-Seon,Lee, Mi-Jai,Hwang, Sung Sic Elsevier 2017 CERAMICS INTERNATIONAL Vol.43 No.6
<P><B>Abstract</B></P> <P>A polycrystalline SiC ceramic prepared by pressureless sintering of α-SiC powders with 3vol% Al<SUB>2</SUB>O<SUB>3</SUB>-AlN-Y<SUB>2</SUB>O<SUB>3</SUB> additives in an argon atmosphere exhibited a high electrical resistivity of ~10<SUP>13</SUP> Ωcm at room temperature. X-ray diffraction revealed that the SiC ceramics consisted mainly of 6H- and 4H-SiC polytypes. Scanning electron microscopy and high resolution transmission electron microscopy investigations showed that the SiC specimen contained micron-sized grains surrounded by an amorphous Al-Y-Si-O-C-N film with a thickness of ~4.85nm. The thick boundary film between the grains contributed to the high resistivity of the SiC ceramic.</P>
Original Article : Measurement of Strabismic Angle Using the Distance Krimsky Test
( Kwang Sic Joo ),( Hyun Koo ),( Nam Ju Moon ) 대한안과학회 2013 Korean Journal of Ophthalmology Vol.27 No.4
Purpose: To evaluate the correlation of the distance Krimsky test and the alternate prism cover test (APCT) for the distance deviation in patients with horizontal strabismus. Methods: Forty patients with horizontal strabismus (20 esotropia and 20 exotropia) were included in this study. Patients with a variable angle of deviation, vertical angle over 5 prism diopters, impaired binocular vision, or poor cooperation were excluded. We instructed the patient to look a target 6 meters away, and applied a prism over the patient``s dominant eye while flashing a light source 33 centimeters from the middle of both eyebrows. When the corneal light reflexes were located on the center of each cornea, we measured the angle of deviation. We defined this method as ``distance Krimsky test,`` and the angle measured by this method was compared with the conventional Krimsky test and APCT at distance. We analyzed the accuracy and intra- and inter-observer reliability. Results: The angle of strabismus measured by the distance Krimsky test showed a significant agreement and correlation with the deviation angle measured by the APCT. We elicited the correlation gradient between the angle measured by the distance Krimsky test and the APCT. In addition, the distance Krimsky test showed significant intra- and inter-observer reliabilities. Conclusions: The distance Krimsky test is expected to be more useful than the Krimsky test in measuring the distance angle of deviation for patients with strabismus in whom it is difficult to measure the angle of deviation using the APCT. The distance Krimsky test can be an accurate and useful test through the improvement of proficiency of examiners and the establishment of individualized normative data.
주철 알루미늄 합금의 Hot Dip Aluminizing시 흑연 및 금속간화합물 층의 형성 거동
한광식 ( Kwang Sic Han ),강용주 ( Yong Joo Kang ),강문석 ( Mun Seok Kang ),강성민 ( Sung Min Kang ),김진수 ( Jin Su Kim ),손광석 ( Kwang Suk Son ),김동규 ( Dong Gyu Kim ) 한국주조공학회 2011 한국주조공학회지 Vol.31 No.2
Hot dip aluminizing (HDA) is widely used in industry for improving corrosion resistance of material. The formation of intermetallic compound layers during the contact between dissimilar materials at high temperature is common phenomenon. Generally, intermetallic compound layers of Fe2Al5 and FeAl3 are formed at the Al alloy and Fe substrate interface. In case of cast iron, high contact angle of graphite existed in the matrix inhibits the formation of intermetallic compound layer, which carry with it the disadvantage of a reduced reaction area and mechanical properties. In present work, the process for the removal of graphite existed on the surface of specimen has been investigated. And also HDA was proceeded at 800oC for 3 minutes in aluminum alloy melt. The efficiency of graphite removal was increased with the reduction of particle size in sanding process. Graphite appears to be present both in the region of melting followed by re-solidification and in the intermetallic compound layer, which could be attributed to the fact that the surface of cast iron is melted down by the formation of low melting point phase with the diffusion of Al and Si to the cast iron. Intermetallic compound layer consisted of Fe(Al,Si)3 and Fe2Al5Si, the layer formed at cast iron side contained lower amount of Si.
기능적 눈물길 폐쇄에서 눈물길 신티그라피와 플루오레세인 염색소실검사의 유용성 비교
주광식,이정규.Kwang Sic Joo. MD. Jeong Kyu Lee. MD. PhD 대한안과학회 2011 대한안과학회지 Vol.52 No.9
Purpose: To compare the usefulness of fluorescein dye disappearance test (FDDT) and dacryoscintigraphy in functional lacrimal blockage. Methods: The present study included with 24 patients (37 eyes), who were diagnosed with functional lacrimal blockage and underwent silicone tube insertion in our clinic. Compared to postoperative symptom improvement, the results of FDDT and dacryoscintigraphy were analyzed. Results: Significant correlations were observed with FDDT and dacryoscintigraphy results in 29 eyes before surgery. In 33 eyes, there were post-operative symptom improvements and the sensitivity of each exam was estimated at 87.8% in FDDT and 90.9% in dacryoscintigraphy. After intubation normal findings were observed in each examination and the symptoms improved in 7 out of 8 eyes. Conclusions: Both FDDT and dacryoscintigraphy were considered sensitive and efficient methods in the diagnosis and evaluation of functional lacrimal blockage. Both methods require caution regarding misinterpretation by false negatives and may be complementary as well as increasing diagnostic accuracy. J Korean Ophthalmol Soc 2011;52(9):1013-1018
Jong-Moon Park,Chang-Joo Yoon,Bo-Woo Kim,Hyun-Sic Chae,Jin-Gun Koo,Jin-Yeong Kang,Kun-Sik Park,Kwang-Soo No,Yong-Sun Yoon 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.I
The effects of resistivity and crystal orientation on the leakage-current and the radiation-response characteristics of silicon PIN detectors have been studied. A high-resistive substrate ($>$8 k$\Omega$$\cdot$cm) shows a larger leakage current than a low-resistive one ($<$4 k$\Omega$$\cdot$cm) at low reverse bias because of its wider depletion width, but the opposite result is seen at high reverse bias. We think that the thermionic field emission (TFE) current increases at high reverse bias for a low-resistive substrate. The detector with a (111)-oriented substrate exhibits leakage current chacteristics comparable to those of the (100)-oriented one when the resistivity of the substrate is 3.8 k$\Omega\cdot$cm. An X-ray beam irradiation test showed that the output current of the detector with the (111)-oriented substrate was 20 \% higher than that of the (100)-orientated one and that the result was independent of the resistivity of the substrate. Based on the results, we fabricated a silicon PIN detector for a personal $\gamma$ ray dosimeter operated at 3 V with a substrate having a (111) orientation and a resistivity of 3.8 k$\Omega\cdot$cm, and we assembled it with read-out integrated circuit. Our detector was sensitive to Cs$^{137}$ natural $\gamma$ rays and showed a good linearity in the exposure rate.
중증 건성안에서 헤파린과 인지질을 사용한 복합치료의 임상적 효과
주광식,전연숙,김재찬,Kwang Sic Joo,MD,Yeoun Sook Chun,MD,PhD,Jae Chan Kim,MD,PhD 대한안과학회 2010 대한안과학회지 Vol.51 No.8
Purpose: To evaluate the therapeutic effects of topical heparin (Hylo-ParinⓇ, Ursapharm Saarbr cken, Germany) and spray type phospholipids (Tears AgainⓇ, Optima Pharmazeutische GmbH. Freising, Germany) in severe dry eye syndrome resistant to conventional therapy. Methods: Twenty eyes of ten patients with refractory severe dry eye were treated with Hylo-ParinⓇ (two times a day) and Tears AgainⓇ (three times a day) for three months. Before and one and three months after treatment, a symptom questionnaire was administered to the patients. The ocular surface disease index (OSDI), tear film break-up time, Schirmer test, conjunctival fluorescein staining examinations and filamentary keratitis were evaluated. Results: After using Tears AgainⓇ and Hylo-ParinⓇ, the OSDI score improved from 64.13 ± 15.12 to 43.80 ± 15.87 (p<0.01). Tear film break-up time significantly increased from 1.0 ± 0.65 to 2.3 ± 0.73 seconds (p<0.01) and conjunctival staining score (Oxford scale) significantly decreased from 3.85 ± 0.75 to 3.25 ± 0.97 (p<0.01). Filamentary keratitis in the slit-lamp examination showed significant improvement (p<0.01). Conclusions: Tears AgainⓇ and Hylo-ParinⓇ are considered as new treatment modalities for severe dry eye syndrome and filamentary keratitis in patients with chronic ocular surface disease resistant to conventional therapy. These treatments require additional research. J Korean Ophthalmol Soc 2010;51(8):1047-1053