• Title/Summary/Keyword: ICB

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The evolution of microstructures and electrical properties of $Y_2O_3$ thin films on si(100) upon annealing treatments (열처리에 따른 $Y_2O_3$ 박막의 미세 구조 변화와 전기적 특성 변화에 대한 고찰)

  • 정윤하;강성관;김은하;고대홍;조만호;황정남
    • Journal of the Korean Vacuum Society
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    • v.8 no.3A
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    • pp.218-223
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    • 1999

  • We investigated the interfacial reactions between the $Y_2O_3$ film deposited by ICB processing and p-type (100) Si substrates upon annealing treatments in $O_2$ and Ar gas ambients. we also investigated the evolution of surface morphology of ICB deposited $Y_2O_3$ films upon annealing treatments. We observed that the root-mean-square(RMS) value of surface roughness measured by AFM increased with annealing time at $800^{\circ}C$ in $O_2$ ambient, while the change of surface roughness was not observed in Ar ambient. We also found the growth of $SiO_2$ layer and the formation of yttium silicate layer. From the capacitance values $(C_{acc})$ measured by C-V measurements, the relative didldctric constant of $Y_2O_3$ film in metal-insulator-semiconductor(MIS) structure was estimated to be about 9.

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The effect of early membrane exposure on exophytic bone formation using perforated titanium membrane (천공형 티타늄 막의 조기 노출이 수직 골 형성에 미치는 영향)

  • Kim, Eun-Jung;Herr, Yeek;Kwon, Young-Hyuk;Park, Joon-Bong;Chung, Jong-Hyuk
    • Journal of Periodontal and Implant Science
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    • v.37 no.2
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    • pp.237-249
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    • 2007

  • This study was performed to evaluate the effect of membrane exposure on new bone formation when guided bone regeneration with perforated titanium membrane on atrophic alveolar ridge. The present study attempted to establish a GBR model for four adult beagle dog premolar. Intra-marrow penetration defects were created on the alveolar ridge(twelve weeks after extraction) on the mandibular premolar teeth in the beagle dogs. Space providing perforated titanium membrane with various graft material were implanted to provide for GBR. The graft material were demineralized bovine bone(DBB), Irradiated cancellous bone(ICB) and demineralized human bone powder(DFDB). The gingival flap were advanced to cover the membranes and sutured. Seven sites experienced wound failure within 2-3weeks postsurgery resulting in membrane exposure. The animals were euthanized at 4 weeks postsurgery for histologic and histometric analysis. The results of this study were as follows: 1. There was little new bone formation at 4 weeks postsurgery. irrespectively of membrane exposure. 2. There was significant relationship between membrane exposure and bone graft resorption(P<0.05), but no relation between membrane exposure and infiltrated connective tissue. 3. There was much bone graft resorption on DFDB than ICB and DBB. 4. The less exposure was on the perforated titanium membrane, the more dense infiltrated connective tissue was filled under the membrane when grafted with ICB and DBB. but there was no relationship between the rate of membrane exposure and the percentage of infiltrated connective tissue area and no relationship between the percentage of the area in the infiltrated connective tissue and in the residual bone graft. Within the above results, bone formation may be inhibited when membrane was exposed and ICB and DBB were more effective than DFDB as a bone graft material when guided bone regeneration.

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Charge-discharge properties by the superconducting energy transfer system (초전도에너지 전송시스템에 따른 충방전 특성)

  • Choi, Hyo-Sang
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2005.11a
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    • pp.363-365
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    • 2005

  • It describes a design analysis and test results of an energy transfer system which consists of two 0.5 MJ superconducting coil and three Inverter-Converter Bridges(hereinafter called ICB). A point of design is to satisfy the required stored energy capacity rather than magnetic field density with minimum energy transfer time using the calculation results of state-space averaging methods instead of Fourier series. It is proven that the considered methods are effectively through system experiments.

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Synthesis and Characteristics of Organic Emitting Materials for OLEDs using Color Conversion Method (색변환법 유기전계발광 소자용 유기 발광 재료의 합성 및 특성 분석)

  • Kwak, Seon-Yeop;Ryu, Jung-Yi;Nam, Jang-Hyun;Lee, Tae-Hoon;Kim, Tae-Hoon;Son, Se-Mo
    • Journal of the Korean Graphic Arts Communication Society
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    • v.23 no.1
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    • pp.77-97
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    • 2005

  • Organic light-emitting diodes(OLEDs) have received considerable attention since they were first reported by Tang. Novel organic fluorescent materials have been reported on synthesis and application of new organic light-emitting materials. Despite of much recent progress, fabrication of full-color OLEDs still remained to be done. Many method have been proposed to full-color OLEDs displays such as using separated red, green and blue emitters, stacking separate rad, green and blue emitter, using a white emitter with individually pattered color filters, microcavity structures and using a blue emitter with individually patterned fluorescent materials. The last method has much attention because of easy fabrication of OLEDs and low-priced fabrication. This paper reports the optical and electrical characteristics of OLEDs using novel molecules containing biphenyl structure. Optical properties of biphenyl derivatives doped with poly(9-vinyl carbazole)(PVK) are measured and found Forster energy transfer process in the blends. And devices were fabricated as ITO/PEDOT/PVK doped with biphenyl derivatives/$Alq_3$/Li:Al and I-V-L characteristics and EL efficiency of devices were examined.

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