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Temperature-dependent Dielectric Properties in ITO/AF/Al Device
최현민,김원종,이종용,김태완,홍진웅 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.61
Temperature-dependent dielectric properties were studied in a device with a structure of ITO/amorphous fluoropolymer (AF)/Al. The AF was thermally deposited at a deposition rate of 0.1 Å/s to a thickness of 20 nm under a pressure of 5 × 10−6 Torr. From the dielectric properties of the device, an equivalent circuit for and the equivalent complex impedance Zeq of the device were obtained. The interfacial resistance was found to be approximately 38 Ω. As the temperature was increased, the radius of the Cole-Cole plot and β also increased for a constant applied voltage. However, as the applied voltage was increased, those values decreased at a constant temperature. These behaviors are thought to be due to an orientational polarization effect of the molecules inside the AF layer.
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상부요로 이행세포암 환자에서 방광재발의 양상 및 위험인자: 장기 추적 결과
최현민,조강수,조성용,최영득,정병하,홍성준 대한비뇨의학회 2008 Investigative and Clinical Urology Vol.49 No.4
Purpose: We wanted to evaluate the patterns and risk factors for subsequent bladder recurrence after surgical management for upper urinary tract transitional cell carcinoma(TCC). Materials and Methods: Between 1986 and 2004, the medical records of the patients who were diagnosed and surgically treated for upper urinary tract TCC were retrospectively analyzed. A total of 215 patients were enrolled in this study, and the median follow-up duration was 53 months (range: 12-240). The bladder recurrence-free survival curve was generated by the Kaplan-Meier method. To investigate the risk factors for subsequent bladder recurrence among the various clinicopathological features, the log rank test and Cox's proportional hazard model were used. Results: Recurrence developed in 81 patients(37.7%). Of them, 70 patients (86.4%) had recurred within 24 months, and 76 patients(93.8%) had superficial bladder cancer. Muscle-invasive bladder cancer developed in only 8 patients(9.9%) during follow-up. On univariate analysis, the T stage, age and urine cytology had an influence on bladder recurrence with statistical(borderline) significance. Multivariate analysis revealed that urine cytology was the only independent risk factor for bladder recurrence (p=0.020). Conclusions: Subsequent bladder recurrence after treatment for upper urinary tract transitional cell cancer usually occurred within two years after surgery, and positive urine cytology is an independent prognostic factor for subsequent bladder recurrence. (Korean J Urol 2008;49:294-299) Purpose: We wanted to evaluate the patterns and risk factors for subsequent bladder recurrence after surgical management for upper urinary tract transitional cell carcinoma(TCC). Materials and Methods: Between 1986 and 2004, the medical records of the patients who were diagnosed and surgically treated for upper urinary tract TCC were retrospectively analyzed. A total of 215 patients were enrolled in this study, and the median follow-up duration was 53 months (range: 12-240). The bladder recurrence-free survival curve was generated by the Kaplan-Meier method. To investigate the risk factors for subsequent bladder recurrence among the various clinicopathological features, the log rank test and Cox's proportional hazard model were used. Results: Recurrence developed in 81 patients(37.7%). Of them, 70 patients (86.4%) had recurred within 24 months, and 76 patients(93.8%) had superficial bladder cancer. Muscle-invasive bladder cancer developed in only 8 patients(9.9%) during follow-up. On univariate analysis, the T stage, age and urine cytology had an influence on bladder recurrence with statistical(borderline) significance. Multivariate analysis revealed that urine cytology was the only independent risk factor for bladder recurrence (p=0.020). Conclusions: Subsequent bladder recurrence after treatment for upper urinary tract transitional cell cancer usually occurred within two years after surgery, and positive urine cytology is an independent prognostic factor for subsequent bladder recurrence. (Korean J Urol 2008;49:294-299)
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