Skeleton pruning as trade-off between skeleton simplicity and reconstruction error

The position and orientation of moving platform mainly depends on global positioning system and inertial navigation system in the field of low-altitude surveying, mapping and remote sensing and land-based mobile mapping system. However, GPS signal is unavailable in the application of deep space exploration and indoor robot control. In such circumstances, image-based methods are very important for self-position and orientation of moving platform. Therefore, this paper firstly introduces state of the art development of the image-based self-position and orientation method (ISPOM) for moving platform from the following aspects: 1) A comparison among major image-based methods (i.e., visual odometry, structure from motion, simultaneous localization and mapping) for position and orientation; 2) types of moving platform; 3) integration schemes of image sensor with other sensors; 4) calculation methodology and quantity of image sensors. Then, the paper proposes a new scheme of ISPOM for mobile robot — depending merely on image sensors. It takes the advantages of both monocular vision and stereo vision, and estimates the relative position and orientation of moving platform with high precision and high frequency. In a word, ISPOM will gradually speed from research to application, as well as play a vital role in deep space exploration and indoor robot control.     

Compressed sensing of superimposed chirps with adaptive dictionary refinement

The compressed sensing （CS） theory shows that accurate signal reconstruction depends on presetting an appropriate signal sparsifying dictionary. For CS of superimposed chirps, this dictionary is typically taken to be a waveform-matched dictionary formed by blindly diseretizing the frequency-chirp rate plane. However, since practical target parameters do not lie exactly on gridding points of the assumed dictionary, there is always mismatch between the assumed and the actual sparsifying dictionaries, which will cause the performance of conventional CS reconstruction methods to degrade considerably. To address this, we model the waveform- matched sparsifying dictionary as a parameterized one by treating its sampled frequency-chirp rate grid points as the underlying parameters. As a consequence, the sparsifying dictionary becomes refinable and its refinement can be achieved by optimizing the underlying parameters. Based on this, we develop a novel reconstruction algorithm for CS of superimposed chirps by utilizing the variational expectation-maximization （EM） algorithm. By alternating between steps of sparse coefficients estimation and dictionary parameters optimization, the algorithm integrates the process for dictionary refinement into that of signal reconstruction, and thus can achieve sparse reconstruction and dictionary optimization simultaneously. Experimental results demonstrate that the algorithm effectively deals with the performance degradation incurred by dictionary mismatch, and also outperforms the state-of-the-art CS reconstruction methods both in compressing the signal measurements and in suppressing the measurement noise.     

将创新进行到底 Asus PadFone Infinity的心体验

将Padfone系列划入到华硕旗下最具特色产品毫不为过,无论是从产品的外观设计还是内置在其中的技术上看都很好的散发出独特味道,这种源自特定品牌的气息并不是单单依靠硬件配置所能拥有的。短短的3个月,最新一代的Padfone来到了CPCFAN评测室,Asus将创新的思路延续了下来,经过两代Padfone的调整与设计经验,PadfoneInfinity手机+平板的组合,以及1+1>2的思路更加明确,强大硬件与出色的UI为PadFone Infinity赋予了出色体验,特别是金属机身的手机以及1080p屏幕有一种让人怦然心动的感觉。     

战斗系统很给力 《剑影聊斋》新版本全面曝光

《剑影聊斋》倾力打造国内首款横版APRG手机游戏,18场BOSS战、200种怪物、1300个关卡副本一一登场,更强势融入太古战场、上古奇境、太白楼等全新玩法,为玩家奉上连连不断新惊喜。     

超混沌遗传算法在多约束QoS组播路由中的应用研究

针对多约束QoS组播路由的优化问题,提出了一种超混沌遗传混沌算法.该算法利用遗传算法中的改进的适应度函数,通过结合超混沌映射优越性的搜索能力,对遗传算法选出的个体进行混沌优化,以改善遗传算法过早陷入早熟的情况.通过仿真实验表明,该算法有效地改进了搜索效率,且收敛速度更快更稳定,是一种解决多约束QoS路由问题可行和有效的方法.     

轻松机房管理

本次我们测试的是ATEN宏正出品的KL1516ACat5高密度双滑轨LCDKVM多电脑切换器,其整合KVM控制端与17”或19”LCD屏幕于一个双滑轨机体内,分辨率为1280×1024,可延伸服务器的距离达50米,     

浅议玉树灾后恢复重建小水电的维修加固与管理措施

2010年4月14日7时49分,青海省玉树藏族自治州玉树县发生7.1级强烈地震,这场突如其来的灾难对玉树人民的生命和财产造成了巨大损失。地震导致2 200多人遇难,千万条生命受伤,千万间房屋倒塌,千万头牲畜死亡……使玉树州原本薄弱的小水电也受到了前所未有的破坏,现有的22座小水电中共有19座被不同程度地震毁、震损,其中西杭、当代两座水电站震毁,受损电站的总装机容量为26.85 MW,造成直接经济损失1.6亿元。为充分发挥这些建成电站的经济效益,针对存在的问题,通过灾后恢复重建、维修加固和加强管理增加效益的可能性很大。     

基于黑龙江省地下水超采区划分中ArcGIS空间分析的应用

ArcGIS软件的空间分析功能可以高效的处理地下水观测数据,为超采区评价提供直观准确的基础分析数据,文章结合地下水超采区的工程实例论述了该方法在数值分析上的应用。     

主打个性时尚 天时达全固态硬盘小本袭来

今年,上网本可谓笔记本电脑市场的一大亮点,几乎所有的笔记本电脑厂商都推出了基于Intel凌动ATOM平台的上网本,上网本的销售情况也频频呈现井喷状。但是．由于配置雷同,不同品牌上网本之间同质化现象相当严重．在这种背景下,国产品牌天时达正式推出了最新的超便携笔记本电脑N89,并大胆的采用了全固态硬盘的硬件配置．     

超微型BT利器uTorrent 2．0问世

地球上使用人数最多、最热门的BT下载软件——uTorrent终于推出了2．0稳定版。也许国内的用户没有接触过这个小工具,不过大家不妨去试试。它不但内置的uTP通讯协议可以减少带宽的消耗,还有相当实用的流量封顶管理……