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류제국,주재한,박세승 조선대학교 생산기술연구소 1995 生産技術硏究 Vol.17 No.2
The computer numerical controlled(CNC) system proceeds toward not only high speed/accuracy but also high functionality. Among these category, the spline interpolation in the lathe is required to generate the special workpieces which have the complex contour and symmetric shape. To meet this requirement, the algorithm of a spline type interpolation for a CNC lathe is developed to resolve the limitation of convensional linear and circular type interpolation. The proposed spline algorithm is designed and realized for the practical implementation into a real CNC system. Furthermore, actual machining test is performmed in order to check the algorithm of spline interpolation and to verify the acceptance in the shopfloor. In the sequal, the spline interpolation . for lathe meets the shopfloor specification and is proved that it can be a real functionality of a CNC system.
유성현,류제국,정세헌,황의창,장원석,황인상,유호송,김선옥,정승일,강택원,권동득,박광성,황준일,김근수 대한비뇨의학회 2013 Investigative and Clinical Urology Vol.54 No.5
Purpose: To determine predictive factors for stent failure-free survival in patients treated with a retrograde ureteral stent for a malignant ureteral obstruction. Materials and Methods: We retrospectively reviewed 71 patients who underwent insertion of a cystoscopic ureteral stent due to a malignant ureteral obstruction between May 2004 and June 2011. Performance status, type of cancer, hydronephrosis grade,location of the obstruction, presence of bladder invasion, C-reactive protein (CRP), serum albumin, and inflammation-based prognostic score (Glasgow prognostic score,GPS) were assessed using a Cox proportional regression hazard model as predicting factors for stent failure. Results: A univariate analysis indicted that hypoalbuminemia (<3.5 g/dL; hazard ratio [HR], 2.43; 95% confidence interval [CI], 1.21 to 4.86; p=0.012), elevated CRP (≥1mg/dL; HR, 4.79; 95% CI, 2.0 to 11.1; p=0.001), and presence of a distal ureter obstruction (HR, 3.27; 95% CI, 1.19 to 8.95; p=0.021) were associated with stent failure-free survival. A multivariate analysis revealed that the presence of a mid and lower ureteral obstruction (HR, 3.27; 95% CI, 1.19 to 8.95; p=0.007), GPS ≥1 (HR, 7.22; 95%CI, 2.89 to 18.0; p=0.001), and elevated serum creatinine before ureteral stent placement (>1.2 mg/dL; HR, 2.16; 95% CI, 1.02 to 4.57; p=0.044) were associated with stent failure-free survival. Conclusions: A mid or lower ureteral obstruction, GPS ≥1, and serum creatinine before ureteral stent insertion >1.2 mg/dL were unfavorable predictors of stent failure-free survival. These factors may help urologists predict survival time.