Consensus protocols for discrete-time multi-agent systems with time-varying delays

This paper addresses consensus problems for discrete-time multi-agent systems with time-varying delays and switching interaction topologies and provides a class of effective consensus protocols that are built on repeatedly using the same state information at two time-steps. We show that those protocols can solve consensus problems under milder conditions than the popular consensus algorithm proposed by Jadbabaie et al., specifically, the presented protocols allow for the case that agents can only use delayed information of themselves, whereas the popular one is invalid. It is proved that if the union of the interaction topologies across the time interval with some given length always has a spanning tree, then in the presence of bounded time-varying delays, those protocols solve consensus problems.     

What can we do with a linear optical logic gate?

In an earlier paper [H.J. Caulfield, J. Westphal, The logic of optics and the optics of logic, Information Sciences 162 (2004) 21-33], we considered a simple interferometer (initially conceived as Mach-Zehnder) with two uniform intensity mutually coherent inputs. By encoding those inputs with phases 0 and π representing Boolean 0 and 1 and identifying the detected values of the outputs as logical Boolean values, we found that the outputs could be identified as the Boolean operations XOR and COINC (sometimes called XNOR). Here, we show that this seemingly simple interferometer can perform many additional functions if we use phases to interpret its outputs. But the XOR/COINC are the only non-trivial logic gate we can get no matter how we cascade Mach-Zehnder interferometers. We also generalize those operations upwards (to three or four arguments). We show that the three argument interferometer or four-argument interferometer cannot produce a Fredkin gate or its variation.     

Synthesis of optimal controllers for piecewise affine systems with sampled-data switching

This paper discusses the optimal control problem of the continuous-time piecewise affine (PWA) systems with sampled-data switching, where the switching action is executed based upon a condition on the state at each sampling time. First, an algebraic characterization for the problem to be feasible is derived. Next, an optimal continuous-time controller is derived for a general class of PWA systems with sampled-data switching, for which the optimal control problem is feasible but whose subsystems in some modes may be uncontrollable in the usual sense. Finally, as an application of the proposed approach, the high-speed and energy-saving control problem of the CPU processing is formulated, and the validity of the proposed methods is shown by numerical simulations.     

智能语音技术在蓄电池充电系统中的应用

介绍了一种利用语音技术实现了语音提示的关于蓄电池充电的充电系统．其中详细分析了电流型开关电源电路、采样和控制接口电路。在充电过程中可根据电池不同类型调用相应的充电算法．以达到延长电池使用寿命。同时在系统中加入语音提示电路．使得充电器的使用更加方便简洁。     

On the controllability of switching linear systems

This note presents a necessary and sufficient condition for small time controllability of a linear switching system (that is, a collection of linear time-invariant control systems, where a trajectory is any concatenation of trajectories of the individual systems). This result extends the controllability condition recently obtained for unconstrained linear switching systems to the case of control which is constrained in a cone.     

Switching model predictive attitude control for a quadrotor helicopter subject to atmospheric disturbances

In this article a switching model predictive attitude controller for an unmanned quadrotor helicopter subject to atmospheric disturbances is presented. The proposed control scheme is computed based on a piecewise affine (PWA) model of the quadrotor's attitude dynamics, where the effects of the atmospheric turbulence are taken into consideration as additive disturbances. The switchings among the PWA models are ruled by the rate of the rotation angles and for each PWA system a corresponding model predictive controller is computed. The suggested algorithm is verified in experimental studies in the execution of sudden maneuvers subject to forcible wind disturbances. The quadrotor rejects the induced wind disturbances while performing accurate attitude tracking.     

《现代交换技术》教学综合改革与研究

以我校《现代交换技术》课程教学过程中存在的问题进行分析和总结，并结合目前行业发展的需求，对该课程的教学内容设计、教学方法的改进、实践教学内容和设备等各方面给出了相应的改革思路和解决方案。     

机载光电传感器图像融合识别的D-S证据理论方法

针对机载光电传感器获得的图像信息的不确定性与模糊性,提出利用D-S证据理论对多图像传感器信息进行融合处理的方法.首先对各图像传感器获得的同一场景图像分别进行预处理,然后对预处理后的图像提取其矩特征,通过与目标图像数据库中图像特征的对比分析,利用灰色系统理论方法获取各传感器的基本概率赋值,最后根据D-S证据理论的组合规则与决策规则获得多图像传感器的融合识别结果.仿真结果表明该方法能提高目标识别的准确度,降低传感器获取的信息的不确定性.