基于马尔可夫决策的理性秘密共享方案

基于马尔可夫决策理论研究理性密码共享系统模型和秘密重构方法。首先利用马尔可夫决策方法,提出适合于理性秘密共享的系统模型,该模型包括参与者集合、状态集合、风险偏好函数、状态转移函数、回报函数等。在模型中,引入秘密重构中的参与者的风险偏好函数刻画秘密共享模型的状态集合和状态转移函数。其次,基于所提出的系统模型构造相应的理性秘密共享方案,基于马尔可夫策略解决各理性参与者在秘密共享方案中的秘密重构问题。最后对方案进行理论分析证明,给出理性秘密重构方案中折扣因子、回报函数、参与者风险偏好函数间的函数关系,其结果表明所提系统模型方法的合理性和有效性。     

高阶FIR型正交镜像滤波器的设计9

本文计论了高阶ＦＩＲ型正交镜像滤波器的设计问题。根据ＦＩＲ正交镜像滤波器设计的基本原理，将高阶正交镜像滤波器的设计问题转换为单变量的优化设计问题。利用一维寻优的算法，可以设计出高阶ＦＩＲ型正交镜像滤波器。     

基于记录比较表的粗糙集属性约简算法

基于粗糙集的属性约简算法,先找出记录比较表中含元素1最少的行,若某行元素为1,则该元素所在列对应的属性须包含在属性约简中,否则从该若干行中找出该元素个数最多的列,再从表中删去所选列中该元素对应的行及该列,剩余部分再构成新记录比较表.重复上步骤直至比较表为空.全部依次选出的各列即构成属性约简.     

酸催化蔗糖水解反应动力学的研究

本文研究了催化剂酸的浓度及温度对蔗糖水解反应的影响。实验结果表明，随着温度和催化剂浓度的增加，反应的速率常数将随之提高，但温度和催化剂酸浓度过高，反应偏高一级反应。     

战术导弹发射车最优路径规划算法研究

介绍了战时情况下,能使战术导弹发射车顺利、安全、高效进入发射阵地的最优路径算法,并提出了两种新的算法.可以通过对此方案的研究,进一步提高我部队的作战效率.     

波浪在水流作用下的变形

本文通过实验研究，分别观测了规则、波单向不规则波和多向不规则波在不同流速条件下的情况，同进利用静水中的实测波浪资料通过理论计算，分析了在水流中的波浪，并将计算值与实测值做了对比。比较表明，当波浪主方向与水流、法线方向的夹角不过大时，计算与实验吻合较好，表明所推荐的理论方法是可行的。     

Turbo multiuser detection for differentially modulated CDMA

In this letter, we study differentially modulated, iteratively decoded CDMA. The iterative multiuser receiver proposed consists of an additional soft-input soft-output (SISO) differential decoder, when compared to turbo multiuser detectors for absolutely modulated systems. Algorithms for iterative decoding with and without phase information at the receiver are developed. The resulting turbo receivers with differential modulation outperform coherent receivers with absolute modulation at moderate to high signal to noise ratios due to the interleaver gain associated with recursive inner encoders in serially concatenated encoding structures.     

一种语音同步提示的倒车雷达的设计

主要阐述倒车雷达的原理,设计方法和电路组成。本设计可实现语音信息的同步播放,为驾驶员提供更加便捷的报警提示,采用的探测方式是超声波测距,处理器采用AT89C2051高速单片机。     

Inverted polymer solar cells with a solution-processed cesium halide interlayer

We demonstrate the utility of a low-cost cesium iodide interlayer spun from an aqueous or 2-ethoxyethanol solution on ITO in inverted polymer solar cells of the structure ITO/CsI/P3HT:PCBM/MoO₃/Al, where P3HT is poly(3-hexylthiophene) and PCBM is [6,6]-phenyl-C₆₀-butyric acid methyl ester. The power conversion efficiency (PCE) of optimized cells was ～3.4%, comparable to that we obtained for inverted cells with Cs carbonate. The thickness of the CsI film was adjusted by varying the solution concentration. The concentration affected the surface morphology of P3HT:PCBM and the density of fractal-like aggregates (possibly related to the presence of Cs and film fabrication conditions) formed near the anode, as revealed by scanning electron microscopy. Auger analysis indicated a P3HT-rich surface. Optimization of the cells was achieved also by varying the thickness of the MoO₃ and the drying/annealing conditions of the active layer, as was evident from the current–voltage characteristics, external quantum efficiency spectra, and PCE. The cells with the CsI interlayer were compared additionally to cells with CsCl or CsF interlayers (with a PCE of up to ～2.7%), which were inferior to the comparable cells with Cs₂CO₃ or CsI. The surface concentrations of Cs and the halide on ITO were monitored using X-ray photoelectron spectroscopy. The iodine level was low with the Cs:I ratio exceeding 8:1. In contrast, the Cs:Cl ratio was ～1.4:1 and the Cs:F ratio was ～1:1; the Cs₂CO₃ decomposed partially, as expected. Therefore, for CsI, as is the case for Cs₂CO₃ but not for CsF, Cs–O bonds are formed at the surface. Such bonds on ITO are important in modifying the ITO work function, improving the cell performance. The results indicate that spin coating solutions of the high polarity CsI is a promising and easy approach to introduce Cs–O on ITO in inverted structures for increased electron extraction from PCBM and possibly hole extraction from the P3HT-rich surface at the anode.     

A green radio resource allocation scheme for LTE-A downlink systems with CoMP transmission

In this paper, we propose a green radio resource allocation (GRRA) scheme for LTE-advanced downlink systems with coordinated multi-point (CoMP) transmission to support multimedia traffic. The GRRA scheme defines a green radio utility function, which is composed of the required transmission power, assigned modulation order, and the number of coordinated transmission nodes. By maximizing this utility function, the GRRA scheme can effectively save transmission power, enhance spectrum efficiency, and guarantee quality-of-service requirements. The simulation results show that when the traffic load intensity is greater than 0.7, the GRRA scheme can save transmission power by more than 33.9 and 40.1 %, as compared with the conventional adaptive radio resource allocation (ARRA) scheme (Tsai et al. in IEEE Trans Wireless Commun 7(5):1734–1743, 2008) with CoMP and the utility-based radio resource allocation (URRA) scheme (Katoozian et al. in IEEE Trans Wireless Commun 8(1):66–71, 2009) with CoMP, respectively. Besides, it enhances the system throughput by approximately 5.5 % and improves Jain’s fairness index for best effort users by more than 155 % over these two ARRA and URRA schemes.