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A new neural network based method for solving the problem of congestion control arising at the user network interface (UNI) of ATM networks is proposed in this paper. Unlike the previous methods where the coding rate for all traffic sources as controller output signals is tuned in a body, the proposed method adjusts the coding rate for only a part of the traffic sources while the remainder sources send the cells in the previous coding rate in case of occurrence of congestion. The controller output signals include the source coding rate and the percentage of the sources that send cells at the corresponding coding rate. The control methods not only minimize the cell loss rate but also guarantee the quality of information (such as voice sources) fed into the multiplexer buffer. Simulations with 150 ADPCM voice sources fed into the multiplexer buffer showed that the proposed methods have advantage over the previous methods in the aspect of the performance indices such as cell loss rate (CLR) and voice quali 相似文献
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进口食品危害物风险综合评价 总被引：2，自引：1，他引：1
以出入境检验检疫局进口酒类食品为例,研究了进口酒类的安全状态评价。通过对进口红酒的综合评价以及各个危害物的污染风险评价,指导进口食品的安全监管。 相似文献
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关于科技期刊编校质量控制的几点体会 总被引：1，自引：0，他引：1
编校人员作为期刊编辑出版活动的主体,需要对繁杂的信息进行整理、加工,从选题策划到组稿,再到审读加工、编辑出版等等,每一个环节无不渗透着编辑人员对期刊质量控制所花费的心血。因此可以说,编辑是出版文化的设计者、组织者和生产者,是新知识领域的开拓者和新成果的催生者,是文化与文明的有效管理者。 相似文献
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针对《线性系统理论》课程内容抽象、数学性强的问题,利用Matlab软件设计一个仿真实验平台,以帮助学生增强对课程基本概念和复杂理论的理解,减轻学习难度,掌握线性系统的分析和设计技能.根据课程主要知识点的学习需要,设计7个仿真实验和1个以桥式吊车为被控对象的综合应用实例.本仿真实验平台的使用无需编程基础,其界面简洁易用,有助于提高基础薄弱学生的学习兴趣.本平台也可用于任课教师进行图形化理论展示、分析结果,以丰富教学手段,提高教学效果. 相似文献
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INTRODUCTION With the increasing complexity and nonlin-earity of control systems, linear switched modelswith parameter uncertainties were suggested byresearchers for describing the nonlinear system(Hassibi, 2000). Typical examples of those switch-ed systems include automobile transmission sys-tems, stepper motor driver, computer disc driver(Hassibi et al., 1999), flexible manufacturing sys-tems and a wide variety of other engineering sys-tems (Lennartson et al., 1994). In recent ye… 相似文献
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For linear switched system with both parameter uncertainties and time delay,a delay-dependent sufficient condition for the existence of a new robust H∞ feedback controller was formulated in nonlinear matrix inequalities solvable by an LMI-based iterative algorithm.Compared with the conventional state-feedback controller,the proposed controller can achieve better robust control performance since the delayed state is utilized as additional feedback information and the parameters of the proposed controllers are changed synchronously with the dynamical characteristic of the system.This design method was also extended to the case where only delayed state is available for the controller.The example of balancing an inverted pendulum on a cart demonstrates the effectiveness and applicability of the proposed design methods. 相似文献
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针对实际应用中具有复杂背景的高分辨率数码图像下车辆牌照定位问题，提出了一种综合利用了车牌纹理特征、几何特征以及色彩特征的快速车牌定位方法。该方法按顺序分为图像预处理、牌照区域粗定位、牌照精确定位三个步骤对牌照由粗到细准确定位出车辆牌照位置所在。实验结果表明．对于场景大，背景复杂的车辆图像，该方法运行速度快，定位准确率高，具较强抗干扰能力。 相似文献
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A new neural network based method for solving the problem of congestion control arising at the user network interface (UNI) of ATM networks is proposed in this paper. Unlike the previous methods where the coding rate for all traffic sources as controller output signals is tuned in a body, the proposed method adjusts the coding rate for only a part of the traffic sources while the remainder sources send the cells in the previous coding rate in case of occurrence of congestion. The controller output signals include the source coding rate and the percentage of the sources that send cells at the corresponding coding rate. The control methods not only minimize the cell loss rate but also guarantee the quality of information (such as voice sources) fed into the multiplexer buffer. Simulations with 150 ADPCM voice sources fed into the multiplexer buffer showed that the proposed methods have advantage over the previous methods in the aspect of the performance indices such as cell loss rate (CLR) and voice quality. 相似文献