http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
소대화,전용우,이영매,임병제,Korobova, Natalya 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
YBCO superconducting thick films were perpared on Ag wire by electrophoresis in acetone and ethanol with chemically modified suspension. The addition of organic compounds, such a PEG into suspension solution for improving critical current density was investigated. Surfac state, deposition conditions, pore distribution and cracks were investigated by using SEM photographs. Controlling preparation conditions were studied for reducing these defects. As a results, in acetone slolution, the surface crack of samples was decreased with increasing PEG. To develop optimum microstructures for samples processes affect the microstructure and hence the properties of ceramic superconductors.
소대화,전용우,이영매,김태완,Korobova, Natalya 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
In this study, by using the electrophoresis, preparation of YBCO superconducting wire deposited on metal Ag base wire was studied with its properties. YBCO powder could be prepared by solid state reactions with calcining and sintering processes. Superconducting wire prepared on metal Ag wire used as cathode of deposition base could be also fabricated in the YBCO/acetone-dispersed solution to obtain several tens of ㎛ thick films. In the process of film deposition, a catalyst I₂added into the suspension solution was very useful for preparing thick film of YBCO, and BaF₂ of additive material was also necessary for preparing crack-free wire of YBCO superconductor. As a result, YBCO superconducting wire added 2~3wt.% of BaF₂with catalyst, I₂had better deposition condition for uniform and dense YBCO wires, and critical current density, Jc was calculated at the value of 1,458A/㎠ (more than 10³A/㎠, 77K, 0[T]) of 30㎛ thick sample by 4-point prove method.
소대화,박정철,이영매,조용준,Korobova, Natalya 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
For the research of the effects on suspension solution with YBcO and BSCCO for elcectrophoretic deposition to prepare superconducting thick film wire, the preheating technique for the superconducting powders in vaccum system was used with various solvent solutions for electrophoresis such as acetone, toluen and buthanol was investigated. As a result, it was useful to remove the influence of remaining and adsorbed solvent solution which was existed between and on the particle surfaces when the specimens of superconducting wire by electrophoresis were treated in vacuum of 10-3 Torr and temperature around 200℃ in bell-jar system. Of the prepared superconducting wire samples, the critical current density, Jc was measured by 4-point prove method in liquid N₂, and at the value of 10³to 10⁴A/㎠, respectively, for the YBCO and BSCCO superconducting wires.
소대화,전용우,박정철 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-
Abstract - In the electrophoresis for fabrication of a superconducting wire and film, the enough deposition and formal sustain of a film condition affect to superconducting state of samples. In this paper, a superconducting film was fabricated with various suspension solution such as acetone, buthanol, and ethanol. As a results, the best deposition condition with d.c 250 V and a.c 25 V of applied voltage, and 90 sec of applied time for BSCCO superconducting film by electrophoresis was investigated.
IMO의 선박안정수 규제와 외래침입생물체의 전기화학적 처리기술
소대화,전용우 明知大學校 産業技術硏究所 2005 産業技術硏究所論文集 Vol.24 No.-
The introduction of invasive marine species into new environments by ship's ballast water, attached to ships' hulls and via other vectors has been identified as one of the four greatest threats to the world's oceans by Global Environment Facility (GEF). IMO (International Maritime Organization) is carrying out the international restriction of the effluence suppression and treatment of Ship's ballast water by Ballast Water Management Convention. In this paper, to deal with this international restriction convention and to consider economic potential of ship's ballaster treatment market near future, the equipment and technology of ship's ballaster water treatment was studied.
위 평활근 세포의 활동전압을 이루는 CI^-전류성분에 관한 연구
방효원,이종찬,이무열,엄대용,이상돈 중앙대학교 의과대학 의과학연구소 1993 中央醫大誌 Vol.18 No.3
Chloride current has been known as a part of backgroud current. Recently, its roles in the maintenance of action potential have much attention. The purposes of the present study are clarifying the chloride current component which might play an important role in generation and maintenance of the action potential in the pyloric circular smooth musele cells. We used the whold cell voltage clamp techniques to assess the current and voltage responses induced by caffeine superfusion. The results were as follow: 1. Caffeine superfusion induced the increase of inward currents in the hyperpolarized potential ranges, and the increase of outward currents in the depolarized ranges. 2. Sodium ion removal from the external medium and the addition of cadmium ion rarely affected these current response. 3. Duration of the action potential was elongated by application of the caffeine and modified by the change of the intracellular chloride ion concentraion. 4. The effect of caffeine superfusion on the action potential disappeared by the addition of the anion channel blocker. The results suggest that caffeine superfusion may prolong the duration of repolarized phase of the action potential probably by the chloride current activation in the gastric antral smooth muscle.
두경부 편팡상피세포암 세포주에서 세포주기 조절인자의 활성 및 이상:후두편평상피세포암에서 종양억제 유전자 CDKN2 유전자 발현이상
송시연,한태희,배창훈,김용대,송계원 영남대학교 의과대학 2005 Yeungnam University Journal of Medicine Vol.22 No.2
Background: Cyclin-dependent kinase (CDK) inhibitors are family of molecules that regulate the cell cycle. The CDKN2, a CDK4 inhibitor, also called p16, has been implicated in human tumorigenesis. The CDKN2, inhibits the cyclin/CDK complexes which regulate the transition from G1 to S phase of cell cycle. There is a previous repot that homozygous deletion of CDKN2 region on chromosome 9p21 was detected frequently in astrocytoma, glioma and osteosarcoma, less frequently in lung cancer, leukemia and ovarian cancer, but not detected in colon cancer and neuroblastoma. However, little is known about the relationship between CDKN2 and laryngeal cancer. Therefore this study was initiated to investigate the role of CDKN2 in human laryngeal squamous cell carcinoma development. Materials and methods: We used 5 human laryngeal carcinoma cell lines whether they have deletion or losses of CDKN2 gene expression by DNA-PCR or RT-PCR, respectively. We examined 8 fresh frozen human laryngeal cancer tissues to detect the loss of heterozygosity(LOH) of CDKN2 PCR was performed by using micosatellite markers of short arm of human chromosome 9 (D9S126, D9S144, D9S156, D9S161, D9S162,D9S166, D9S166, D9S171,D9S200 and D9SIFNA).For informative cases, allelic loss was scored of the signal of one allele was significantly decreased in tumor DNA when compared to eh same allele in normal DNA. Results: the CDKN2 DNA deletion was observed in 3 cell lines. The CDKN2 mRNA expression was observed in only one cell line, which was very weak. LOH was detected in 7 cases(87.5%) Conclusion: These results suggest that CDKN2 plays a role in the carcinogenesis of human laryngeal squamous cell carcinoma
비부비동 반정성 유두종의 전산화 단층촬영상과 자기공명영상의 분석
배창훈,서영중,이석춘,천승민,백운희,정은채,송시연,김용대 영남대학교 의과대학 2005 Yeungnam University Journal of Medicine Vol.22 No.2
Background: Computed tomography (CT) is commonly used to evaluate the degree of sinus involvement in case of inverted papilloma (IP). However, CT cannot differentiate tumor from adjacent inflammatory mucosa or retained secretions. By contrast, magnetic resonance imaging (MRI) has been reported to be useful in distinguishing IP from paranasal sinusitis. This study investigated whether preoperative assessment with MRI and CT accurately predict the extent of IP. Materials and methods: CT and MRI were retrospectively reviewed in 9 case of IP. Patients were categorized into staged based on CT and MRI findings according to the staging system proposed by Krouse. The involvement of IP in each sinus was also assessed. Results: Differentiation of IP from inflammatory disease may be more successful in routine case where the inflammatory mucosa has low signal intensity on T1-weighted images and very high signal intensity on T2-weighted images. CT imaging could not differentiate tumor from adjacent inflammatory mucosa or retained secretions. Conclusion: Preoperative MRI of IP can predict the location and extent of the tumor involvement in the paranasal sinuses and sometimes predicts malignant changes.