| 1 | Delay-range-dependent Stability Criterion for Interval Time-delay Systems with Nonlinear Perturbations显示文摘In this paper, we consider the problem of robust stability for a class of linear systems with interval time-varying delay under nonlinear perturbations using Lyapunov-Krasovskii (LK) functional approach. By partitioning the delay-interval into two segments of equal length, and evaluating the time-derivative of a candidate LK functional in each segment of the delay-interval, a less conservative delay-dependent stability criterion is developed to compute the maximum allowable bound for the delay-range within which the system under consideration remains asymptotically stable. In addition to the delay-bi-segmentation analysis procedure, the reduction in conservatism of the proposed delay-dependent stability criterion over recently reported results is also attributed to the fact that the time-derivative of the LK functional is bounded tightly using a newly proposed bounding condition without neglecting any useful terms in the delay-dependent stability analysis. The analysis, subsequently, yields a stable condition in convex linear matrix inequality (LMI) framework that can be solved non-conservatively at boundary conditions using standard numerical packages. Furthermore, as the number of decision variables involved in the proposed stability criterion is less, the criterion is computationally more effective. The effectiveness of the proposed stability criterion is validated through some standard numerical examples. | K.Ramakrishnan G.Ray | 2011 | International Journal of Automation and computing2011，8，1： | 14 |
| 3 | 严格控制血糖的糖尿病患者发生机动车事故的风险增加显示文摘背景糖尿病并发症可威胁驾驶员安全驾驶机动车的能力,而对血糖正常是否可预测糖尿病成人驾驶风险在正常范围了解甚少。我们对糖化血红蛋白(HbA1c)与机动车事故风险的相关性做了人群对照分析。方法从2005年1月1日至2007年1月1日我们对持有驾驶执照的糖尿病驾驶员,记录了他们的糖化血红蛋白(HbA1c)值。统计了交通事故风险潜在的混合因素,包括血糖监测、并发症和治疗。结果有57人发生过1起交通事故,738人未发生事故。与对照组相比,发生事故者平均HbA1c值明显降低(7.4%vs7.9%,非配对t检验,P=0.019)。HbA1c每降低1%发生交通事故的风险性就增加26%〔OR=1.26,95%CI(1.03,1.54)〕。这种趋势在HbA1c范围内被证实,在校正了混杂因素后这种趋势仍然存在〔OR=1.25,95%CI(1.02,1.55)〕。对于事故,有2个重要的风险因素:严重低血糖史需要提供外界帮助的〔OR=4.07,95%CI(2.35,7.04)〕,确诊为糖尿病时年龄较长者〔OR/10年=1.29,95%CI(1.07,1.57)〕。结论对于入选患者,测量HbA1c,严格控制血糖与机动车事故风险增加有关。 | Donald A.Redelmeier Anne B.Kenshole Joel G.Ray 周淑新 | 2010 | 中国全科医学2010，13，26： | 0 |
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