Efficient and accurate computation of geometric moments on gray-scale images

A novel algorithm that permits the fast and accurate computation of geometric moments on gray-scale images is presented in this paper. The proposed algorithm constitutes an extension of the IBR algorithm, introduced in the past, which was applicable only for binary images. A new image representation scheme, the ISR (intensity slice representation), which represents a gray-scale image as an expansion of several two-level images of different intensity values, enables the partially application of the IBR algorithm to each image component. Moreover, using the resulted set of image blocks, the geometric moments’ computation can be accelerated through appropriate computation schemes.     

企业绿色IT实施的理论模型

本文通过分析企业实施绿色IT的整个过程,提出了企业绿色IT实施的理论模型。首先运用利益相关者理论,分析了利益相关者对企业实施绿色IT的影响。企业实施绿色IT有三个主要动机,分别为：经济动机,制度压力和社会责任。其次,基于企业资源理论,企业在这一实施过程中需要投入三类资源,分别是IT基础设施、IT人力资源以及其他无形资源。这三类资源的投入会影响到企业的环境绩效,即环境效率和环境效能。最后,企业的环境绩效转而会影响企业的经济绩效,在这个过程中如果企业获得了差异化优势和价格优势,则环境绩效会促进企业的经济绩效,反之则可能损害企业的经济绩效。     

基于Visual C++和数据库技术的PQDIF文件访问接口程序的开发

针时电能质量监测网络的数据交换需采用PQDIF作为统一数据格式的问题,在对PQDIF数据格式的物理和逻辑结构的基础上,给出了PQDIF数据文件的访问思路和方法.利用Visual C++结合IEEE提供的PQDIF软件包开发了面向 Labview平台的PQDIF文件的访问接口程序.     

2D 仿真5VS5 防守策略研究

为提高水中多机器鱼协作能力,针对国际水中机器人大赛2D仿真水球5VS5项目,提出应对当前主流的进攻方式的防守策略。对于直线型进攻方式,提出"勺子型"防守策略;对于勺子型进攻方式,提出"破勺子型"防守策略。结果表明:该策略能很好地完成防守任务,其调整跟踪函数也能做到非常好的实时跟踪。运用该策略曾经在2012年中国水中机器人大赛上取得过亚军。     

Preparation and characterization of KGM/CdS nanocomposite film with low infrared emissivity

In this research, novel organic-inorganic nanocomposite films of Konjac glucomannan (KGM) and CdS were prepared by one-step synthesis. As-prepared films were characterized by IR, TEM and SEM. The results indicated that hexagonal CdS nanoparticles with the sizes of 10 to 100 nm were well dispersed in KGM. The infrared emissivities of the films were characterized by IR-1 infrared emissivity instrument. As results showed, the KGM/CdS nanocomposite films had significantly lower infrared emissivity (8-14 μm), meanwhile when the size of KGM nanoparticles was between 10 and 20 nm and the mole ratio of CdS to KGM was 1.2:1, the film got the lowest infrared emissivity value of 0.011, which would be attributed to the strong synergism effect existing between KGM and CdS nanoparticles.     

基于ANSYS和ADAMS的刚柔耦合卫星太阳电池阵的建模研究

根据太阳电池阵结构的特点,同时为了更准确的模拟太阳电池阵的展开过程,建立了基于ANSYS和ADAMS的太阳电池阵刚柔耦合模型,首先阐述了ADAMS柔性体的基本理论,介绍了在ADAMS中建立柔性体的方法,然后利用模态中性文件将柔性的连接架和基板导入ADAMS中,建立了卫星太阳电池阵的刚柔耦合模型,并通过对比分析太阳电池阵展开状态下的一阶模态频率,验证了建模方法的有效性。     

可变线路式公交运行服务能力优化策略

为了提高乘客出行需求不确定条件下可变线路式公交的运行服务能力,提出了动态离站时间窗策略以及待选站点策略两种运行优化策略.首先对策略应用背景下可变线路式公交运行方式进行了详述,并将其划分为两阶段的优化问题.然后采用混合整数规划模型对该问题进行建模,第1阶段的优化目标为最大化被服务的乘客数量,第2阶段的优化目标是最小化被接...     

基于云计算的电子邮件安全服务系统的设计与实现

目前电子邮件安全扫描软件正在被广泛使用,随着用户数量和系统流量的激增,传统的紧耦合同步处理IMHS系统整体效能、健壮性、可维护性、可扩充性上都存在着难以克服的问题。针对海量用户压力之下存在的系统瓶颈,确立了以“松耦合、异步、无状态”为设计原则,通过融合云计算及面向服务体系结构(SOA)技术,设计并实现了一个基于P2P协同的对等化电子邮件安全云服务系统。该系统支持服务过程动态协同,有效提高了资源使用效率和系统可伸缩性。最后在实际系统中通过典型操作实例测试分析了系统性能,验证了系统架构的可行性和有效性。     

From one to crowd: a survey on crowdsourcing-based wireless indoor localization

Wireless indoor localization has attracted growing research interest in the mobile computing community for the last decade. Various available indoor signals, including radio frequency, ambient, visual, and motion signals, are extensively exploited for location estimation in indoor environments. The physical measurements of these signals, however, are still limited by both the resolution of devices and the spatial-temporal variability of the signals. One type of noisy signal complemented by another type of signal can benefit the wireless indoor localization in many ways, since these signals are related in their physics and independent in noise. In this article, we survey the new trend of integrating multiple chaotic signals to facilitate the creation of a crowd-sourced localization system. Specifically, we first present a three-layer framework for crowdsourcing-based indoor localization by integrating-multiple signals, and illustrate the basic methodology for making use of the available signals. Next, we study the mainstream signals involved in indoor localization approaches in terms of their characteristics and typical usages. Furthermore, considering multiple different outputs from different signals, we present significant insights to integrate them together, to achieve localizability in different scenarios.     

基于内网节点的防火墙穿透方法

网络防火墙是保护数据安全的有效手段,目前采用最多的是NAT技术,但在特定情况下需要外网无痕穿越防火墙对内网数据进行访问,在这种需求下NAT技术就束手无策。针对上述需求,提出一种新的防火墙穿透技术,采用内网节点主动发起连接的方式连接内外网,实现防火墙或子网的穿透,并在ARM平台上实验验证了该技术的可行性,该方法已经获得了国家知识产权局的发明专利授权。