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.

XML 문서의 효율적인 구조 검색을 위한 동적 색인 모델

신승호,손충범,유재수 충북대학교 컴퓨터정보통신 연구소 2001 컴퓨터정보통신연구 Vol.9 No.2

XML문서는 정보 표현의 기본 단위인 엘리먼트로 구성되어져 있다. 이러한 정보 표현의 기본 단위인 엘리먼트가 XML문서 내에서 구조 변정 이 발생 할 경우 보다 빠른 검색을 위해 기존의 색인 구조 정보의 변경 없이 효율적으로 처리 되어져야 한다. 이를 위해 본 논문에서는 XML 문서의 구조 변정 시 기존의 색인 구조에 효을적으로 수용될 수 있는 동적 색인 모뗄을 제안한다. 본 논문에서 제안 하는 동적 색인 모뗄을 위한 구조정보는 기존의 EID(Element Id), ETID(Element TrPe Id), SORD(Sibling ORDer) SSORD(Same Sibling ORDer), Ccount 구조정보 추출 방법에 SSORD를 대신한 STSOL(Same TyPe Sibling ORDer List). Scount (STSOL내의 SORD 개수). 그리고 COL(Child ORDer List)을 추가함으로써 구성된다. 이러한 구조정보를 이용해 효율적인 검색을 지원하기 위한 동적 색인 구성 알고리즘을 기술하고 제한하는 색인 기법이 기존의 동적 색인을 지원하는 기법 보다 내용 색인, 구조 색인, 애트리뷰트 색인 측면에서 우수함을 성능 평가를 통해 보인다. XML documents consist of elements that are basic units of information. When the structure of XML documents is changed dynamically, we need to update structure information efficiently without changing the information of an index structure for fast retrieval In this Paper, we propose a dynamic index modelling scheme that update index struoture in real time as the structure of XML documents is changed by insertion and deletion of elements. In recent, for indexing XML documents. we have proposed a structural information representation method such as element ID(EID), element type ID(ETID), sibling order(SORD). same sibling order(SSORD) and child count(Ccount). Besides them, our proposed dynamic index modelling method in this paper extracts additional structural information, such as same type sibling order list(STSOL) that substitutes for SSORD. Scount that is the number of SORDS in STSOL. and child order Bist(COL). We design a dynamic indexing technique with our structural information. We show through various experiments that our method outperforms existing enes in processing various types of queries such as content based queries, structural queries and hybrid queries.

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.

비대칭 사장교의 정적 및 시공 단계 해석

신재철,남기수,정인수,한성호 충남대학교 산업기술연구소 2001 산업기술연구논문집 Vol.16 No.1

The cable-stayed bridges are composed of cables, towers and girders. when the cable-stayed bridges are loaded, the whole structure display very complex behavior due to excessive cable deflection. Eventhough the material in the members of a cable-stayed bridge structure behaviors in a linear elastic manner. the overall load-displacement relationship for the structure will be nonlinear. The nonlinear behavior is a result of: due to the sag caused by their own dead weight and the nonlinear axial and bending force-deformation relationships for the bend members. In the construction stage analysis, some technical approaches and structure safety are needed to stimulate numerically the complicated changes of structural system during construction. In this study static and construction stage analysis is performed and compared. Static and construction stage analysis on unsymmetric Cable-stayed bridge is performed and linear and nonlinear analysis is performed to evaluate the structure characteristics. After Static analysis of final construction stage was performed, construction stage analysis was performed.

R.F. Magnetron Sputtering법으로 제조한 LaCoO₃박막의 가스감지 특성

신정호,김정규,박기철,전춘배,장재영 慶尙大學校 工科大學 自動化및컴퓨터應用技術硏究所 1998 自動化 및 컴퓨터應用技術 Vol.5 No.1

LaCoO₃(LCO) thin film sensors were fabricated on an alumina substrate by r.f. magnetron sputtering. By varying the annealing temperature of the LCO film from 600℃ to 1000℃, we investigated X-ray diffraction pattern, electrical properties, and gas sensing properties of the films. The crystallinity was improved and the activation energy was increased with increasing the annealing temperature. The sensitivities of the LCO films for NH₃ and CO gases were also increased with the annealing temperature. Sensing properties of LCO thin films were improved when the measuring temperature was 350℃ or more

Chiari malformation 환아에서 상악 구치부의 부유치

신은영,최병재,이제호,손흥규 大韓小兒齒科學會 2001 大韓小兒齒科學會誌 Vol.28 No.4

Chiari malformation은 하부 뇌간과 소뇌가 대공 속으로 들어가 하향 편위의 소견을 보이는 중추 신경계의 기형으로 3가지 type으로 분류된다. 본 증례는 7세 10개월 된 여환이 10일전부터 칫솔질시 상악 우측 어금니가 아프고 얼굴이 약간 붓고 아프다는 주소로 내원하였는데, 임상구강검사결과 상악 우측 제1대구치 원심에 치은낭이 형성되어 있었고 동요도와 동통이 존재하였다. 악골 방사선사진검사결과 상악 구치부의 골밀도가 정상에 비해 낮으며, 특히 좌우측 제1대구치 하방의 골의 부재가 보였다. 유년성 치주염의 가진 하에 치주치료 중 전신질환과의 연관성 문진으로 Chiari malformation의 의과적 병력을 확인한 후 3차원 전산화단층촬영을 시행하였다. 두개골이 전반적으로 얇으며 다수의 골결손이 관찰되고 대공이 다소 커져있으며 후두골과 상악골의 골밀도가 감소되어 있었고 특히 상악 구치부의 치조골이 거의 없어 상악 좌우측 제1대구치가 부유치처럼 보였다. 이에 본원 신경외과로 협의진료를 의뢰하여 계속적으로 관찰하고 있는 중이다. 소아에서 치주염이 의심될 때 leukemia, hystiocytosis X, hypoposphatasia등의 잠재된 전신질환과 연관되어 있을 수 있으므로 적절한 검사를 시행해야 하며 전신질환의 근본적인 원인을 치료할 수 있도록 고려해야 한다. The Chiari malformation is a deformation within the central nervous system which the lower brain stem and the cerebellum migrate into the foramen magnum causing herniation. In 1891, Arnold Chiari classified such symptoms into 3 categories. This case report is of a 8-year-old female with the complaint of a slight facial swelling and pain on the upper right molar during tooth brushing since 10 days before. Clinical examination showed gingival pocket formation on distal of the upper right first molar with pain and mobility of the tooth. Radiographic examination showed generalized low bone density in the upper molar area, and especially no bone support above the upper right and left first molars were noted. With a temporary diagnosis of Early-onset periodontitis, consultations with medical doctors for the possibility of an underlying systemic disease were made during periodontal treatment. 3D CT was taken with after a final diagnosis of Chiari malformation. Genralized thinning and defect of the cranial bone was noted and the foramen magnum was slightly enlarged. The occipital and maxillary bone was low in density, and the alveolar bone of maxillary posterior teeth was especially almost non-existing causing the upper right and left first molar to be floating. For this, the patient went under consultation with the department of neurosurgery and is still under observation. Periodontitis in childreren is very rare. When symptoms of periodontitis appear in a child, due to the possibility of an underlying systemic disease such as leukemia, histiocytosis X, and hypophosphatasia, proper examinations should be carried out so that the primary factor the symptoms can be treated.

몰리브덴이 첨가된 Stellite 6 합금의 마모와 부식특성

申種喆,金在洙,李德悅,梁在雄,尹珍國,盧大虎,李種權 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.10

Hardfacing layers of Stellite 6 with different molybdenum content are deposited on AISI 1045-carbon steel using Plasma Transferred Arc welding(PTA) machine. The microstructures, wear and corrosion resistances of the hardfacing layer are investigated in order to clarify the effect of molybdenum in Stellite 6 alloys. The microstructural characterizations of the hardfacing layers are performed using X-ray diffraction, back scattered electron images, and scanning electron microscopy. With an increase of Mo contents, M_6C type carbide are formed instead of Cr-rich type carbides, and so this microstructural change enhanced the mechanical properties such as wear and corrosion resistance of a Mo-modified Stellite 6 alloy.

대형 화재로 인한 사상자의 손상 유형과 합병증 : 동인천 라이브호프 화재를 중심으로

신중호,김재광,염석란,신종환,민순식,임용수,양혁준,이근,황성연 대한응급의학회 2001 대한응급의학회지 Vol.12 No.3

Background: High risks of fire alway exist for buildings in urban areas, especially those in downtown. Crowds, as well as more complex and larger structures, may cause more victims in the event of fire; therefore, emergency medical service plans must be established for such disastrous events. Methods: On the evening of October 30,1999, a fire broke out in downtown, Dong-Incheon Live-Hof restaurant; 56 people were killed and 76 were injured. Most of them were teenagers. We retrospectively reviewed the medical records of the victims, Results: 1) Among the 56 dead, 54 died from smoke inhalation, one from extensive burns, and one from sepsis during treatment. 2) Among the 76 injured, 70 patients suffered from smoke inhalation, 53 from burns, and 9 from several types of trauma (sprains, contusions, lacerations, abrasions, fractures, etc.). 3) Later complications were laryngeal edema, pulmonary edema, scar contracture, and hypoxic brain damage, and so forth. 4) Post traumatic stress syndrome was unexpectedly more prevalent in mildly to moderately injured survivors and witnesses than in seriously injured survivors. Conclusion: Many complications exist after a fire. Some may be resolved in time, but others may result in permanent sequelae. Early rescue, early triage, and early management during transport by emergency medical service (EMS) personnel can result in fewer complications and a lower mortality rate. Therefore, we propose the establishment of plans to be followed during various major disasters.

鋼橋梁 下部플랜지 맞대기 鎔接이음부의 鎔入不足에 따른 疲勞擧動에 관한 硏究

신재철,한성호,정인수 충남대학교 산업기술연구소 1999 산업기술연구논문집 Vol.14 No.2

A major defective welding pattern in the steel bridges is identified as the lack of welding area due to the insufficient welding penetration. In this study is fatigue behavior and fatigue life of steel bridge under flange of weld insufficient of butt weld joint. Fatigue behavior and fatigue life test is minor's law and fracture analysis and nowaday, finite element method is used to many times. By considering the welding defect in the above, structural analysis is conducted to evaluate butt weld joint influence due to welding defect on the safety of steel bridges. The results indicate that, due to the insufficient welding penetration, the stress obtained in the analysis is over the allowable fatigue stress level, and its influence on safety of the bridges is significant