一种高效的Turbo码硬件实现算法

针对Turbo码译码实现中硬件消耗、时延和纠错性能之间的矛盾，对Turbo码硬件实现中的译码算法进行了优化研究，提出了一种基于MAX-Log-MAP算法的高效Turbo码硬件实现算法。实验表明，本文所实现的Turbo码是硬件消耗与译码性能的良好折衷。     

FPGA实现高速FFT处理器的设计

介绍了采用Xilinx公司的Virtex -II系列FPGA设计高速FFT处理器的实现方法及技巧。充分利用Virtex -II芯片的硬件资源 ,减少复杂逻辑 ,采用流水方式对复数数据实现了加窗、FFT、求模平方三种运算。整个设计采用流水与并行方式尽量避免瓶颈的出现 ,提高系统时钟频率 ,达到高速处理。实验表明此处理器既有专用ASIC电路的快速性 ,又有DSP器件的灵活性的特点 ,适合用于高速数字信号处理     

Two-stage flowshop earliness and tardiness machine scheduling involving a common due window

This paper studies a non-preemptive two-stage flowshop scheduling problem to minimize the earliness and tardiness under the environment of a common due window. The window size and the window location are considered to be given parameters. The just-in-time problem exists naturally and has many practical applications. The problem is shown to be NP-complete in the strong sense. We develop a branch and bound algorithm and a heuristic to solve the problem. We conduct the computational experiments to test the performances of the algorithms. A strong lower bound is derived for the branch and bound algorithm that can efficiently solve 15 jobs problem for about 5 minutes. The heuristic is shown to be efficient and effective, which can solve the problem of 150 jobs for about 20 seconds and provide near-optimal solution. We justify that the heuristic is an excellent solution approach for large problem instances. We also show that four special cases are either polynomial solvable or NP-complete in the ordinary sense.     

课程设计环境的建立及其实现

本文提出,建立计算机课程设计的设计环境,以提高学生的设计能力和水平;并建立评估系统为课程设计评分。设计环境由计算窗口、辅导窗口、命令窗口、记事卡窗口、绘图系统、知识系统、过程文档记录及评估系统组成。程序实现采用面向对象的程序设计方法,成绩评估采用层次分析法。     

Dynamic efficiency assessment of the Chinese hotel industry

The paper introduces for the first time a totally dynamic two-stage approach to analyzing the hotel industry's technical efficiency at the sub-national level. The first stage uses data envelopment window analysis (DEWA) to assess regional hotel sectors' technical efficiency over time. Unlike previous studies, the second stage uses a dynamic Tobit model to investigate the impact of macro contextual factors on the hotel sector efficiency. The study chooses the Chinese hotel industry during the period 2001-2006 as its application setting. The findings of the investigation indicate that the Chinese hotel industry is approaching an efficient operation in general, recovering from a major dip in 2003 resulting from the Severe Acute Respiratory Syndrome (SARS) outbreak. In addition, the study introduces a novel two-dimensional efficiency-based matrix to assess the competitive advantage of different regions of the Chinese hotel sector. The paper presents strategic market implications for hoteliers, government decision-makers, and destination management organizations. The proposed methods are applicable for situations in which an exogenous event of a destabilizing impact (e.g., SARS) does occur.     

Profitability measurement of UK theme parks: an aggregate approach

Traditionally, financial ratios were used for profitability measurement. This research attempts to apply data envelopment analysis (DEA) to aggregate various financial ratios into a composite profitability index. The research sample includes 13 parks managed by 10 leading theme park operators in the UK. The result first reveals that multi‐site operators are significantly more profitable than their single‐site rivals. Furthermore, the consistency between DEA and ratio analysis indicates that DEA can be used as a good proxy of ratio analysis. It is hoped that this approach can provide new insights about financial measurement not available to managers through ratio analysis. Copyright © 2008 John Wiley & Sons, Ltd.     

一种Link16信号的检测识别算法

在Link16信号侦察中,Link16信号的检测识别是实现信号分选的基础和关键。设计了一种基于双滑动窗的自适应双门限Link16信号检测识别算法,具有检测识别准确率高、实时性好、易于工程实现的特点。仿真结果表明,当信噪比在7 dB以上时,脉冲检测识别正确率均在95〖WT《Times New Roman》〗%〖WTBZ〗以上。     

利用随机共振解调微弱MFSK信号

采用随机共振解调微弱MFSK信号解决了传统解调方法误码率高的问题。 根据大噪声环境下信号能借助噪声能量发生随机共振这一理论,先将微弱MFSK信号通过双稳 态随机共振系统以提高其信噪比,对随机共振系统的输出信号用FFT来区分每段信号的载波 频率,最后依据判决准则解调MFSK信号。当信噪比较高时,可向信号中人为添加白噪 声来使之适用于该解调方法。MATLAB仿真结果表明,该方法能成功解调信噪比最低为 -23 dB的2FSK信号和-25 dB的8FSK信号,而这是传统相干解调方法所无法达到的。     

塑钢窗制作安装质量控制浅析

塑钢门窗发展迅速,应用日益广泛,但由于塑钢门窗制作、安装以中小型企业偏多,在塑钢门窗的制作安装中尚存在一定的问题。因此,本文对塑钢门窗制作、安装中亦出现的质量的几个问题进行探讨。     

基于改进Super-SBM模型的视窗分析

运用灰色关联分析方法确定科技投入相对科技产出的滞后期,用滞后影响系数法计算出修正的科技产出值,在视窗分析方法中引入考虑科技投入产出滞后效应的Super-SBM模型,评价9个先进制造业科技投入产出的效率值。视窗分析方法能够衡量同一个决策单元在不同时期的相对效率情况,Super-SBM模型更充分地考虑科技投入产出的松弛性问题,能进一步区分有效的决策单元,综合这两种方法使得本文的评价过程更符合实际。