公交车站牌报站屏的设计

介绍了新型太阳能公交车站牌报站显示系统。该系统利用太阳能、LED显示和微控制技术,采用W78E58单片机作为系统的中央控制单元,可实现同一站牌不同路数公交车站点的静态显示、动态显示和定时显示控制。利用VB软件编程可实现PC机通信,通过RS232接口可对整个系统升级,提高了系统的可操作性。整个系统采用太阳能供电,蓄电池作为后备电源,可有效节约电能。     

一种高性价比CAN总线适配卡的设计与实现

针对传统CAN总线设备存在的系统规模大、功耗高、成本高等问题,提出并实现了一种高性价比CAN适配卡系统。介绍了系统总体结构,阐述了软硬件组成及其功能,并给出硬件具体设计方案及驱动程序的实现方法。经实践证明,该适配卡系统完全可满足实际需要且结构简单、能耗低、稳定性能好。     

Optimizing counter-terror operations: Should one fight fire with “fire” or “water”?

This paper deals dynamically with the question of how recruitment to terror organizations is influenced by counter-terror operations. This is done within an optimal control model, where the key state is the (relative) number of terrorists and the key controls are two types of counter-terror tactics, one (“water”) that does not and one (“fire”) that does provoke recruitment of new terrorists. The model is nonlinear and does not admit analytical solutions, but an efficient numerical implementation of Pontryagin's minimum principle allows for solution with base case parameters and considerable sensitivity analysis. Generally, this model yields two different steady states, one where the terror organization is nearly eradicated and one with a high number of terrorists. Whereas water strategies are used at almost any time, it can be optimal not to use fire strategies if the number of terrorists is below a certain threshold.     

Improvements of nonlinear dynamic modeling of hot-film MAF sensor

The operating procedure of engine requires that the mass air flow (MAF) sensor can measure the pulsation air flow accurately. Therefore the MAF sensor must possess fast response speed. It is necessary to study the dynamic characteristic of the MAF sensor. Both the experimental equipments and method used by authors previously are improved to obtain the sensor response data accurately in this paper. The static and dynamic separable modeling method is adopted to build the uniform nonlinear dynamic model of the hot-film MAF sensor in the Hammerstein and Wiener forms, which can describe the large/small flow-rate and positive/negative step responses. The performance indexes are calculated by the actual and model responses.     

Continuous State Dynamic Programming via Nonexpansive Approximation

This paper studies fitted value iteration for continuous state numerical dynamic programming using nonexpansive function approximators. A number of approximation schemes are discussed. The main contribution is to provide error bounds for approximate optimal policies generated by the value iteration algorithm.      

Exact methods and a heuristic for the optimization of an integrated replenishment-storage planning problem

In this paper we study the coordination of different activities in a supply chain issued from a real case. Multiple suppliers send raw materials (RMs) to a distribution center (DC) that delivers them to a unique plant where the storage of the RMs and the finished goods is not possible. Then, the finished goods are directly shipped to multiple customers having just‐in‐time (JIT) demands. Under these hypotheses, we show that the problem can be reduced to multiple suppliers and one DC. Afterwards, we analyze two cases; in the first, we consider an uncapacitated storage at DC, and in the second, we analyze the capacitated storage case. For the first case, we show that the problem is NP‐hard in the ordinary sense using the Knapsack decision problem. We then propose two exact methods: a mixed integer linear program (MILP) and a pseudopolynomial dynamic program. A classical dynamic program and an improved one using the idea of Shaw and Wagelmans are given. With numerical tests we show that the dynamic program gives the optimal solution in reasonable time for quite large instances compared with the MILP. For the second case, the capacity limitation in DC is assumed, which makes the problem solving more challenging. We propose an MILP and a dynamic programming‐based heuristic that provides solutions close to the optimal solution in very short times.     

低带宽全搜索VBSME结构的优化设计

为支持H.264/AVC可变块运动估计(VBSME)要求,提出一个高性能的二维脉动阵列结构,该结构具有数据重传次数少,存储器带宽要求低的特性.对结构中存在大量延迟寄存器开销的问题,用基于数据流的AON网络模型对阵列结构的计算依赖关系进行分析,并使用动态规划算法,得到了优化的结构设计.     

大规模地形实时可视化算法

提出一种实现大规模三维地形可视化的算法。该算法主要通过地形数据分块和多线程数据动态调度技术实现海量地形数据的实时动态调度,利用四叉树结构来简化地形网格,通过引入Y型基元的方法消除边界裂缝。实验结果表明,采用该方法可以实时生成大规模地形,提高地形漫游的效率与可视化效果。     

基于动态滑模的无死锁时间管理算法

基于新一代仿真体系结构HLA的IEEE1516新标准中的最大有效逻辑时间关键值,讨论最大有效逻辑时间在HLA时间管理中的重要意义,分析其在常规时间推进算法中的实现及死锁的产生,研究并证明HLA时间推进中的4个产生死锁的充分条件,即互斥条件、请求保持条件、不剥夺条件和环路等待条件,提出动态滑模的概念,设计了基于动态滑模的无死锁时间管理算法,对Lookahead的合理设置进行了分析。     

自适应动态信任关系量化模型的研究

提出一个新的自适应动态信任关系量化模型。该模型在建立基于历史函数的直接信任计算方法和基于路径函数的反馈信任聚合模型的基础上,引入自信因子和反馈因子来自动建立和动态调节直接信任与反馈信任的权重。仿真实验结果表明,与现有模型相比,该模型能够有效提高可信决策的准确性。