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원자력발전소 터빈의 고장진단 및 수리방안을 위한 복합 전문가 시스템의 개발
노재정,이창렬 慶星大學校 1997 論文集 Vol.18 No.2
The best aim of the operation of nuclear power plant is its safety and reliability. So the purpose of this paper is to develop a hybrid system for diagnosis and treatment of nuclear power plant turbine, in order to improve safety and reliability of the operation of turbine. The proposed system can not only diagnose abnormal status of turbine but also propose appropriate treatment procedure for the diagnosed status, based on the results of diagnosis. The hybrid system developed in this paper is composed of an expert system with knowledge base and inference engine, nam-machine interface with hypertext and graphic screens, and databases for failure recording and treatment suggestion. The causes of the failure of turbine can be identified in two step diagnosis. In the first diagnosis step, causes are checked by the operators with the location and characteristics of the frequencies and nose. Based on the first diagnosis, the detailed analysis are performed with data from sensors and monitors of the turbine. The expecting effect of this system is to improve the turbine operation reliability, to organize the knowledge of diagnosis and treatment procedure, and to help judgement and decision-making of operators.
정혜정,김용,이재열,박홍준 동아대학교 기초과학연구소 2001 基礎科學硏究論文集 Vol.18 No.1
펄스레이저 증착법 (Pulsed Laser Deposition) 및 급속열처리 산화공정에 의하여 Ge 나노결정이 함유된 MIS (metal-insulator-semiconductor) 구조를 제작하였다. 이 MIS 구조의 전하충전 특성을 C-V(capacitance-voltage) 방법에 의하여 연구하였다. Ge 나노결정이 함유된 MIS 구조는 모두 강한 C-V hysteresis를 나타내어서 전하충전현상이 존재함을 확인하였다. 게이트 바이어스 sweep rate를 변화시키면서 C-V 특성을 조사한 결과 sweep rate 가 감소함에 따라 C-V 이력곡선의 폭이 감소함을 발견하였고 특히 정공충전 후 순방향의 sweep에서 측정한 C-V 곡선에 특이한 plateau 현상이 일어남을 발견하였다. 이 plateau 의 폭은 sweep rate를 감소시킴에 따라 감소하였고 높이 또한 감소하였다. 이 plateau는 Ge 나노결정에 충전되었던 정공에 의한 현상으로 해석된다. Sweep rate 와 plateau 의 높이의 상관 관계로부터 정공의 탈출시간과 관련이 있는 특성시간 τ는 약 11 초 정도로 산출되었다. The charge retention characteristics in a metal-insulator-semiconductor capacitor containing Ge nanocrystals is investigated by means of capacitance-voltage measurements with various gate bias sweep rates. The metal-insulator-semiconductor capacitor is fabricated by pulsed laser deposition and rapid thermal oxidation. The capacitance-voltage curve shows the strong hysteresis indicating charging/discharging of carriers during the gate bias sweeping. The stored charge densities evaluated from the flat band voltage shifts, show the non-dispersive carrier relaxation, which is a characteristic property for nanocrystals arranged in a layer. In addition, we observe interesting capacitance ledge during forward bias sweeping. From the trap distribution determination by Terman method, the capacitance ledge is due to an energetically localized trap at 0.33 eV +Ev. The energetic position of the trap is in agreement with the ground state hole energy level in Ge nanocrystal.
이경원,김은미,권민철,김용,이재열,박홍준 동아대학교 기초과학연구소 2000 基礎科學硏究論文集 Vol.17 No.1
본 연구에서는 emitter와 collector 사이의 간격과 current density 대 electric field (J-K)특성을 초점으로 카본나노튜브의 전계방출 특성을 조사하였다. 카본 소스로 CH4, 촉매 및 희석가스로서 NH3를 사용하고 HFCVD를 이용하여 실리콘 위에 카본나노튜브를 성장하였다. 나노튜브의 지름이 20-40nm이고 길이는 15㎛이다. I-V곡선에서 onset voltage는 Vons=3.36V/㎛이고, 2.5V/㎛ 의 전기장에서 8mA/cm2이상의 높은 전류밀도 특성을 보였다. Fowler-Nordheim 그래프를 그려서 팁의 특성을 나타내는 β값을 계산하였다. We report the field emission properties of carbon nanotube, focusing on current density versus electric field (J-F) characteristics and the spacing between the emitter and collector. We grow carbon nanotubes on sillicon using hot-fillament chemical vapor deposition, using CH4 gas as the carbon source and NH3 gas as the catalyst and dilution gas. Nanotubes are distributed from 20 to 40nm in diameter and 15㎛ long. Onset field of the field emission is 3.36V/㎛ and the current density is 8mA/cm2 at an electric field of 2.5V/㎛. A Fowler-Nordheim plot was made. Field enhancement factor β is calculated.
HFCVD법을 이용하여 제작한 n-형 다이아몬드 박막의 특성 연구
김병규,황윤식,권민철,김용,이재열,박홍준 동아대학교 기초과학연구소 2000 基礎科學硏究論文集 Vol.17 No.1
HFCVD법으로 암모니아 가스를 사용하여 n-형 도핑된 다이아몬드 박막을 제작하여, 기판온도와 암모니아 가스 첨가비에 따른 박막의 morphology의 변화를 조사하였다. 증착된 시료에 대한 SEM, Raman, XRD를 이용하여 박막의 특성을 분석하고, 도핑에 따른 전계방출 특성을 측정하였다. 양질의 n-형 도핑된 다이아몬드 박막을 증착시키기 위해 기판온도와 암모니아 첨가비에 따른 최적의 증착조건을 찾을 수 있었다. We fabricate n-doped diamond thin films by hot filament chemical vapor deposition method(HFCVD) using ammonia as a doping gas and investigate the effect of the substrate temperature and the ammonia gas ratio upon the diamond film morphology. The SEM, Raman spectroscopy, and the XRD analysis are executed to characterize film morphology. Field emission property of the film is measured also. We find optimum conditions of the substrate temperature and the ammonia gas ratio to deposit high quality n-doped diamond thin films.
Selective Formation of Si Nanocrystals by Assist Ion Beam Irradiation
Jae Kwon KIM,Yong KIM,Hong Jun BARK,Jae-Yel YI,Jung Hyun KANG,Kyu Man CHA,Tae Hun CHUNG,Young Dae KIM 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
The deposition of substoichiometric SiOx films is investigated by means of dual ion beam deposition with emphasis on assist ion beam irradiation effect. Linear dependence of oxygen content, x, on oxygen partial pressure is found. Preferential sputtering of Si phase over SiO2 phase during assist ion beam irradiation has the effect of increasing the oxygen content in the ion-beam exposed region. The property indicates the lateral modulation of oxygen content of SiOx film by inserting a shadow mask in the assist ion beam during deposition. The area-selective formation of Si nanocrytals is shown by photoluminescence measurements after post-deposition annealing.
( Jae Woo Lee ),( Hyun Jae Lee ),( Choong Jae Lee ),( Su Yel Lee ),( Byeong Kyou Jeon ),( Heung Seog Bae ),( Kyoung Rai Cho ) 한국응용약물학회 2011 Biomolecules & Therapeutics(구 응용약물학회지) Vol.19 No.1
In this study, we investigated whether ambroxol significantly affects secretion, production and gene expression of mucin from cultured airway epithelial cells. Confluent primary rat tracheal surface epithelial (RTSE) cells were pretreated with adenosine triphosphate (ATP) for 5 min and then treated for 30 min with ambroxol to assess the effect on mucin secretion using ELISA. Additionally, confluent NCI-H292 cells were pretreated with ambroxol for 30 min and then stimulated with EGF or PMA for 24 h. The MUC5AC mucin gene expression and mucin protein production were measured by RT-PCR and ELISA. The results were as follows: (1) ambroxol did not significantly affect ATP-induced mucin secretion from cultured RTSE cells; (2) ambroxol inhibited the production of MUC5AC mucin protein induced by EGF and PMA in NCI-H292 cells; (3) ambroxol also inhibited the expression of MUC5AC mucin gene induced by EGF and PMA in NCI-H292 cells. This result suggests that ambroxol can inhibit the production and gene expression of MUC5AC mucin, by directly acting on human airway epithelial cells.
Atomic structure of monatomic S B steps on clean Si(001) and Ni-contaminated Si(001)
Yi, Jae Yel,Kim, Dal Hyun,Cho, Jaewon,Lee, Sekyung,Koo, Ja Yong,Hwang, Chanyong 東亞大學校附設基礎科學硏究所 1997 基礎科學硏究論文集 Vol.14 No.1
The atomic structure at monatomic-height S B steps on clean Si(001) and a Ni-contaminated Si(001) was investigated using high-resolution scanning tunneling microscopy at room temperature. Rebonded S B steps are dominant on clean Si(001). Nonrebonded S B steps with split-off dimers are favored on the Ni-contaminated Si(001) and in the vicinity of dimer vacancies on clean Si(001). The nonrebonded step with the split-off dimer is generated by the strain due to dimer vacancies. A buckled dimer was observed in the vicinity of a kink of S B step edges on clean Si(001). [S0136-1829(96)09739-1]
( Su Yel Lee ),( Hyun Jae Lee ),( Jae Woo Lee ),( Byeong Kyou Jeon ),( Ju Ock Kim ),( Choong Jae Lee ) 대한결핵 및 호흡기학회 2011 Tuberculosis and Respiratory Diseases Vol.70 No.3
Background: We investigated whether curcumin and genistein affect the MUC5AC mucin production from human airway epithelial cells that is induced by phorbol 12-myristate 13-acetate (PMA) or tumor necrosis factor-α (TNF-α). Methods: Confluent NCI-H292 cells were pretreated with each agent for 30 min and then stimulated with PMA or TNF-α for 24 hours. MUC5AC mucin production was measured by an ELISA. Results: (1) Curcumin dose-dependently inhibited the production of MUC5AC mucin that was induced by PMA or TNF-α; (2) Genistein inhibited PMA-induced MUC5AC mucin production. However, it did not decrease TNF-α-induced MUC5AC mucin production. Conclusion: These results suggest that curcumin and genistein inhibit the production of airway mucin induced by PMA.