Coevaporation에 의한 cd₁-xZn_(x)S 박막 제작 및 특성에 관한 연구

李載亨,李虎烈,朴鏞冠,申成浩,申載爀,朴光子 성균관대학교 1998 학술회의지원논문목록집 Vol.1998 No.-

In this paper, structural optical and electrical properties of Cd_(1-x)Zn_(x)S thin films prepared by coevaporation method were studied. Also, effects of ZnS mole ratio(x) to CdS on properties of thin film Cd_(1-x)Zn_(x)S/CdTe solar cells were investigated. When the ZnS mole ratio was less than 0.85, the crystal structure of Cd_(1-x)Zn_(x)S films was hexagonal with the c axis aligned perpendicular to the substrate. For x>0.85, however, the Cd_(1-x)Zn_(x)S films were grown with cubic zincblende structire. As the ZnS mole ratio increased the lattice constant of Cd_(1-x)Zn_(x)S films rapidly increased with ZnS mole ratio. The open circuit voltage of Cd₁xZnxS/CdTe solar cells increased with x due to reducing of the electron affinity difference between Cd₁xZnxS and CdTe films. However, the increase of series resistance due to the high resistivity of Cd_(1-x)Zn_(x)S films results on reducing conversion efficiency.

Induction of heme oxygenase-1 protects against podocyte apoptosis under diabetic conditions

Lee, Sang Choel,Han, Seung Hyeok,Li, Jin Ji,Lee, Sun Ha,Jung, Dong-Sub,Kwak, Seung-Jae,Kim, Seung Hye,Kim, Dong Ki,Yoo, Tae-Hyun,Kim, Jin Hyun,Chang, Se-Ho,Han, Dae Suk,Kang, Shin-Wook International Society of Nephrology 2009 Kidney international Vol.76 No.8

Heme oxygenase-1 (HO-1) is an anti-oxidant enzyme normally upregulated in response to oxidant injury. Here we determined the role of HO-1 in podocyte apoptosis in glomeruli of streptozotocin-treated rats and in immortalized mouse podocytes cultured in media containing normal or high glucose. HO-1 expression, its activity, the ratio of Bax/Bcl-2 protein, and active caspase-3 fragments were all significantly higher in isolated glomeruli of diabetic rats and in high glucose–treated podocytes. These increases were inhibited by zinc protoporphyrin treatment of the rats or by HO-1 siRNA treatment of the podocytes in culture. The number of apoptotic cells was also significantly increased in the glomeruli of diabetic rats and in high glucose–treated podocytes. Inhibition of HO-1 accentuated the increase in apoptotic cells both in vivo and in vitro. Our findings suggest that HO-1 expression protects against podocyte apoptosis under diabetic conditions.

AES-128 Rijndael 암·복호 알고리듬의 하드웨어 구현

신성호,이재흥 한밭대학교 정보통신전문대학원 2004 정보통신전문대학원 논문집 Vol.2 No.1

본 논문에서는 미국 국립표준기술연구소(NIST)에서 채택한 차세대 암호 표준인 Rijndael 암호 알고리듬을 하드웨어로 구현한다. 효율적인 연산을 위해 라운드를 2개의 부분 라운드로 나누고 부분 라운드 간에 파이프라인을 사용하였으며, 1 라운드 연산시 평균적으로 5클록이 소요된다. AES-128 암호 알고리듬을 ALTERA PPGA를 사용하여 하드웨어로 구현 후 성능을 분석하였다. 구현된 AES-128 암호 알고리듬은 암·복호화시 최대 90 Mhz의 동작 주파수와 약 230 Mbps의 암·복호율을 얻을 수 있었다. In this paper, Rijindal cipher algorithm is implemented by a hardware. It is selected as the AES(Advanced Encryption Standard) by NIST. The processor has structure that round operation divided into 2 subrounds and subrounds are pipelined to calculate efficiently. It takes 5 clocks for one-round. The AES-128 cipher algorithm is implemented for hardware by ALTERA FPGA, and then, analyzed the performance. The AES-128 cipher algorithm has approximately 230 Mbps encryption·decryption rate for 90Mhz max clock frequency.

웨이브렛 계수 Zero Crossings를 이용한 영상의 잡음제거 및 압축

신재호,이용준,은종숙,이성우 동국대학교 산업기술연구원 1997 산업기술논문집 Vol.10 No.-

윤곽선이나 에지같은 영상 데이터의 중요한 성분들은 웨이브렛 계수의 zero crossings를 통해 검출할 수 있다. 이런 방법은 영상의 패턴 인식에 관한 연구에서 sharp variation points를 검출하는데 사용되었다. 웨이브렛 변환과 zero-crossings를 거쳐 국부 극치의 위치를 검출하는데 이 방법을 적용하여서 영상의 잡음제거에 사용하도록 개선하였다. 더욱이 영상 데이터에서 전체 영상의 픽셀과 정보를 저장하는 대신, 대부분의 중요한 성분을 효과적으로 몇몇 국부 극치값으로 압축하였다. 그 결과 새로 개선된 기법은 패턴 인식 분야에서만 아니라 높은 압축률의 잡음 제거에도 사용될 수 있다. The important image data components such as contours and edges could be detected by zero crossings of wavelet coefficient. This method has been used for the studies on pattern recognition of images to detect sharp variation points. We have applied it to detection of the position of local maxima through zero-crossings and wavelet transform, so that it is improved to be used for noise-eliminating of image. In addition it could compress the image data into a few of local maxima which held the most of important component efficiently without saving All image pixels and information. As the result, the newly improved method could be implemented not merely for the field of pattern recognition but for that of noise removal at the higher compression ratio.

전자빔으로 전처리한 제지폐수의 처리특성

신경숙,박재규,강호 忠南大學校 環境問題硏究所 1998 環境硏究 Vol.16 No.-

Treatability test for paper-mill wastewater pretreated with electron beam irradiation was investigated using the activated sludge simulation. The dose of electron beam irradiation exposed to paper-mill wastewater was relatively low(1kGy). The results showed that the BOD/CODCr of irradiated paper-mill wastewater increased up to 0.45 from 0.36 of unirradiated one. This was due to the conversion of nonbiodegradable organics to biodegradable ones by electron beam exposure. For the activated sludge systems operated at the various HRTs, BOD removal efficiency and COD removal efficiency of both reactors were similar. As a tool of sludge bulking measurement, sludge volume index(SVI) of activated sludge system operated with irradiated paper-mill wastewater was found to be lower (about 210∼ 241㎖/g)than that with unirradiated paper-mill wastewater(about 249∼298㎖/g). Biokinetic constants derived from Ekenfelder's modified model appeared 8.72/day for the irradiated paper-mill wastewater and 4.95/day for the unirradiated paper-mill wastewater, respectively. From the above results, it concluded that the pretreatment of paper mill wastewater with electron beam irradiation could improve the biodegradability as well as sludge activity even with the relatively low dose of electron beam irradiation.

심상성 루프스에서 Nested-Primer Gene Amplification Assay에 의한 결핵균 DNA의 검출

신문석,전효진,김병천,이규석,김재룡,권호준,송준영 啓明大學校 醫科大學 1994 계명의대학술지 Vol.13 No.4

Lupus vulgaris, which is a progressive form of postprimary tuberculosis in patients with a moderate to high degree of immunity and tuberculin sensitivity, is the most common, most serious, and most variable type of cutaneous and mucous membrane tuberculosis. Domonstration of M.tuberculosis directly or in culture in some of these eruptions can be difficult. It is essential to demonstrate the presence of M.tuberculosis in a clinical sample for a definitive diagnosis of tuberculosis. With the discovery of the polymerase chain reaction (PCR), the DNA diagnostic approach for infection has developed in a short period. With the dual purpose of definitive and rapid diagnosis of tuberculosis, this study examined the usefulness of a nested PCR for detection of M. turberculosis. Compared with a single-step PCR, the two-step PCR was able to enhance sensitivity approximately 1,000-fold on the basis of bacterial counts and DNA quantity. We concluded that two-step nested PCR appeared to be the most useful PCR protocol for early and sensitive diagnostic method detecting M.tuberculosis in acid-fast stain negative specimens.

LaCrO_(3) 후막의 가스 감도 특성

신정호,장재영,김정규,박기철 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

LaCrO_(3) thick film sensors were fabricated on an alumina substrate by screen printing method. The sensitivities for gases were investigated by varying the heat treatment temperatures of the films. The sensitivities of LaCrO_(3) thick film for Gallo and NH_(3) gases were better than for CO and NO gases. The best condition of heat treatment was 450℃ and the optimal operating temperature of LaCrO_(3) thick film for the highest sensitivity was 400℃. Sensitivities of LaCrO_(3) thick films about at 3000ppm for C_(4)H_(10) and NH_(3) gases were 85% and 95%, respectively.

쇄골두개 이형성증 환아의 치아발육이상

이제호,신은영,최병재,손흥규 대한소아치과학회 2001 大韓小兒齒科學會誌 Vol.28 No.1

쇄골두개 이형성증(Cleidocranial Dysplasia)은 autosomal dominant skeletal dysplasia로 쇄골의 부재, 두개골 봉합지연 및 치아이상의 특징을 갖는 질환이다. 치아이상 중에 유치열 발달은 정상인데 반해 영구치 맹출 실패가 가장 특징적인 소견이며 다수의 과잉치의 존재, 치아형태이상과 치근형태이상 등이 존재한다. 영구치의 지연 혹은 맹출 부전의 원인으로 (1) 다수의 과잉치 존재, (2) cellular cementum이 없는 기형적 치근형태, (3) 악골의 높은 골밀도, (4) 유치와 골의 비정상적 흡수를 들 수 있으며 저하된 골대사가 주원인이며 두 번째로 다수의 과잉치의 존재를 들 수 있다. 이의 치료방법은 더 많은 치아 맹출의 환경조성을 위한 교정치료, 외과적 처치 및 보철적 수복이 필요하다. 본 증례는 쇄골두개 이형성증으로 진단받은 7세 10개월 여 환아로 영구치 미맹출을 주소로 본원에 내원하였다. 임상구강검사에서 유치의 만기잔존, 악궁의 협착, 전치부 반대교합과다수의 치아우식증이 관찰되었으며 악골의 방사선사진에서 유치의 만기잔존 및 상하악에 다수의 과잉치가 관찰되었고 두부방사선사진에서 미폐쇄된 봉합과 봉간골(wormian bone)이 관찰 되었으며 흥부방사선사진에서 쇄골의 부재가 보였다. 이 환아의 성장에 따른 치열 발달을 이해하고 시기에 따른 적절한 치과적 처치에 대해서 본 증례에서 보고하는 바이다. Cleidocranial Dysplasia(CCD) is an autosomal dominant human bone disease characterized by abnormal clavicles, patent sutures and fontanelles, and dental anomalies. Among dental anomalies, it is characterized that permanent dentition is severly disturbed due to multiple supernumerary teeth and abnormalities of tooth morphology. A eight-year-old female patient diagnosed as cleidocranial dysplasia visited in our hospital. Upon clinical oral exam, retained deciduous teeth, constriction of dental arch, anterior cross bite, and multiple dental caries were observed. In the dental panoramic radiograph, retained deciduous teeth and multiple supernumerary teeth in the maxilla and the mandible were found. In the cephalometric radiograph, open sutures and wormian bones were seen. In the chest P-A view, absence of clavicles was observed. The cleidocranial dysplasia patients have eruption problems in permanent dentition both in regions with and without supernumerary teeth. The severely delayed or arrested eruption of permanent teeth has been ascribed to various factors : 1) The presence of multiple supernumerary teeth, 2) malformed roots with lack of cellular cementum, 3) the jaw bone being too dense, and 4) abnormal resorption of bone and primary teeth. Formation and maturation of primary teeth in cleidocranial dysplasia are normal, whereas the permanent dentition has various ano malies. Therefore, dentists should understand the development of dentition in cleidocranial dysplasia, and treat them in proper time.

確率有限要素法을 利用한 Frame 構造物의 信賴性解析

신재철,정원석,한성호,김선훈 忠南大學校 産業技術硏究所 2002 산업기술연구논문집 Vol.17 No.1

In this paper reliability analysis using stochastic finite element method is formulated, and with its result reliability analysis is accomplished. A displacement and member force of frame structure is acquired in SFEMP(Stochastic Finite Element Method Program) using perturbation method, and then DMCSP(Direct Monte Carlo Simulation Program) is used to verify and compare previous results. With the previous two results, approximate reliability analyses of the MFOSM(Mean First Order Second Moment), AFOSM(Advanced First Order Second Moment), and MCS(Monte Carlo Simulation) including a relatively simple limit state function have accomplished and base of a safety estimate could be acquired. Finally, When the reliability analysis of a complicated structure using stochastic finite element method is accomplished, time is efficiently reduced, and the safety of a structure can be easily evaluated. Hence SFEMP may be considered an efficient tool for evaluating the structural safety and reliability of frame structure.

국내산고령토정제에 관한 연구

신건철,이재장,전호석,조성백 江原大學校 産業技術硏究所 1990 産業技術硏究 Vol.10 No.-

The samples used for this work were low grade clay(Fe?O? : 2.90%, TiO? :1.65%) produced from Youngsan-do district, and for the iron-bearing impurities removal having a bad influence on Kaoline sample was carried out column floatation using Oleic acid, Potassium oleat, Aero 840 promotor, Aero 870 promotor and Keroseneas collectors. For removal of the iron-vearing impurities from the kaoline, investigated first chemical composition size distribution of Kaoline sample, also performanced a basic study on pulp density, collector and pH change on a sort frother. The flotation separation of impurities from kaoline can be achieved by using both oleic acid and Aero 840 promotor as collectors within narrow aoid limits(pH 2-3). Pine oil was more effective frother than MIBC with olelic acid as aa collector.