Performance of closed loop transmit diversity in a Rayleigh fading channel

In this paper, the closed loop transmit diversity technology for the Wideband Code Division Multiple Access（WCDMA） systems is investigated in a multipath Rayleigh fading channel. The RAKE receiver model and the weighing vector algorithm are presented. The performance is theoretically analyzed in terms of the average maximal Signal-to-Noise Ratio（SNR） gain available over the Space-Time block coding based Transmit Diversity（STTD） technology. Theoretic analysis and simulation results show that the closed loop transmit diversity can provide a 3dB performance gain over the open loop scheme in a single path fading channel, while the performance gain decreases dramatically with the increasing inherent multipath diversity of the wireless channel.     

基于OMAP3530的多媒体信息处理及通信系统设计

为了设计一种功能丰富、易于扩展的多媒体处理系统,根据多媒体系统现状及发展趋势,制定了基于嵌入式Linux以及OMAP3530处理器为核心的系统设计方案,该系统具有多媒体模块、网络模块、显示模块及人机交互模块等。在此基础上进行了系统的硬件、驱动及应用层设计,软件平台在Linux内核2.6.28的基础上进行驱动的开发以及编解码算法的移植。实验表明,该系统具有功能多样化、技术一体化、系统集成化等一系列特点。针对不同的用户需求,可进行功能重组,对厂商和终端用户而言,将更加灵活方便,并且具有良好的应用前景。     

Solar drying vs. open sun drying: A framework for financial evaluation

Initiatives towards large-scale dissemination of solar dryers for drying of agri-produce face severe competition from the largely prevalent practice of open sun drying in most of the developing countries. Therefore, solar drying systems must offer exceptionally attractive financial gains to enhance their acceptance among the potential users. A modest attempt to develop a simple framework to facilitate a comparison of the financial feasibility of solar drying as against open sun drying has been made in the present work. Results of some exemplifying calculations are presented and briefly discussed.     

基于OpenCL的MD5破解算法

在基于GPU的异构平台上,采用开放计算语言(OpenCL)实现破解算法,利用分轮生成攻击密码、图形渲染管线加速存取以及多密码并行等方法对算法进行优化,在Intel四核CPU Q8230(2.3 GHz)和一片NVIDIA GT200组成的平台上进行实验。实验结果表明,在相同CPU平台上该算法能够获得高于破解软件John the ripper 17倍的破解速度。     

近边坡厂房结构的三维动态有限元分析

本文介绍山东仓上露天金矿近边坡厂房结构的三维动态有限元分析方法和结果,计算中主要考虑爆破震动载荷的作用,给出了结构的内力和位移历程。然后,根据最大内力和位移,进行了结构稳定性校核。此外,还对结构的地震响应特性进行了探讨。     

遗传算法在露天矿开采设计中的应用

介绍遗传算法的基本原理，采用自适应学习遗传算法确定了露天矿山的开采顺序和开采境界。初步试验表明，遗传算法的效果良好。     

“慕课”对我国高职教育发展的启示

大规模网络开放课程（ MOOC,慕课）为网络时代的学习者提供了一种新的知识获取渠道和学习模式,成为一种全新的学习途径。通过梳理和总结MOOC发展的历史,分析了MOOC项目的主要特点,从教学和人才培养、终身教育体系下学习型社会的形成两个方面着手,提出了MOOC对我国高职教育进一步快速良性发展的启示。     

平果铝土矿的设计与建设

岩溶堆积型铝土矿是少见的和特有的矿床类型,本文通过广西平果铝土矿论述了这种矿床的地质特征和提出了为适应这些特征所采用的采矿、选矿和加工工艺,可供类似矿山参考。     

基于三坐标测量机的测量软件MworksCAD

针对制造业对三坐标测量软件的需求,基于三坐标测量机(Coordinate Measuring Machine,CMM)设计并实现测量软件MworksCAD,将其体系结构分为4层:机器层、驱动层、功能服务层和界面层,将尺寸测量接口规范(Dimensional Measuring Interface Standard,DMIS)测量语言作为系统的信息载体,实现智能化的测量点采样、测量路径选择和碰撞检测,提供基于Open CAsCADE的三维CAD模型显示与操作,可以满足测量过程自动、高效的要求.     

OSPM: A design methodology for open strategic planning

This study employs a design science perspective to propose a methodology for open strategic planning (OSP). Habermas’ discourse theory and Bryson’s strategy change cycle are used as informing kernel theories. A methodology is proposed to satisfy the requirements retrieved from the kernel theories. The proposed methodology contains modules for a planning system and a planning process. Design principles are explained through a blueprint of the system and process. The proposed methodology is applied and evaluated in two cases. Contributions to the literature involve extending the literature on OSP to an applicable methodology with guidelines on how to implement open strategy.