一种适用于智能设备的多重操作系统架构

针对智能设备,为避免引入虚拟化技术而产生的性能开销,提出并实现了MuxOS。MuxOS是一种多重操作系统架构,使得智能设备可以在非虚拟化条件下运行多个操作系统。介绍了MuxOS工作原理,描述了MuxOS运行流程。测试结果表明, MuxOS性能优于Xen等虚拟化产品,可以实现操作系统间亚秒级的快速切换。     

A novel initial ranging algorithm for OFDMA systems using smart antenna

To improve the capacity of initial ranging （IR） users simultaneously accessing into network and enhance the performance of the IR, a novel IR algorithm is presented for the orthogonal frequency division multiple access systems with the smart antenna. The beamforming weight vectors provided by the antenna array are introduced for the IR users, and the procedures of the multiuser parameter estimation and the interference cancellation are designed. The proposed method can improve the accuracy of the channel estimation of active paths and efficiently reduce the residual multiple access interference. Simulation results show that the proposed method has a much better performance than the available successive multiuser detection and interference cancellation algorithm and accommodates more active ranging users simultaneously accessing into a cell.     

面向新一代智能电表的微电流指纹自动配对技术

针对智能电表与表后断路器大多依赖人工掌机扫码进行配对,配对过程过度依赖人工,成本高,且容易发生误配对串户等问题,提出了面向新一代智能电表的微电流指纹自动配对技术。该技术通过在蓝牙断路器内置开关电容模块和编码电路,将配对特征码信息调制成无功电流信号,利用电力线传输至智能电表,并与蓝牙断路器广播发送的配对特征码信息进行比对,从而实现智能电表与表后断路器的自动配对。该配对过程无需依赖人工,极大地降低了人工成本,提高了配对的准确性。最后,实验验证了所提的微电流指纹自动配对技术的正确性和有效性。     

Ethereum smart contract security research: survey and future research opportunities

Blockchain has recently emerged as a research trend, with potential applications in a broad range of industries and context. One particular successful Blockchain technology is smart contract, which is widely used in commercial settings (e.g., high value financial transactions). This, however, has security implications due to the potential to financially benefit froma security incident (e.g., identification and exploitation of a vulnerability in the smart contract or its implementation). Among, Ethereum is the most active and arresting. Hence, in this paper, we systematically review existing research efforts on Ethereum smart contract security, published between 2015 and 2019. Specifically, we focus on how smart contracts can be maliciously exploited and targeted, such as security issues of contract program model, vulnerabilities in the program and safety consideration introduced by program execution environment. We also identify potential research opportunities and future research agenda.     

智能电网中电动汽车充电的自适应电价控制方法

针对电动汽车的充电提出一种电价控制策略。聚合管理者集中管理电动汽车的电池,并且考虑用电高峰时电网的电能供给有限,通过电价控制调整充电的需求量。采用自适应动态规划,通过在线网络训练,得到最优的电价策略。仿真结果表明,该自适应电价控制方法能够通过学习电动汽车的移动性和充电过程,从而调整实际充电需求量至期望水平,保证智能电网的稳定运行。     

Adoption of travel information in user-generated content on social media: the moderating effect of social presence

Travel patterns have gradually changed from group travel to individual travel. An increasing number of people acquire travel information through various types of media. One of the alternative information sources is social media, which enables users to exchange information among members. However, one of the characteristics of social media is information sharing, not information search, which involves both giving (i.e. posting) and taking (i.e. selective reading, forwarding, replying, linking, and liking) information. Compared to the ‘giving’ side of information-sharing research, less effort has been spent on the ‘taking’ side of information research. Therefore, we investigate travel information adoption in social media as well as how individuals communicate with each other. We use the elaboration likelihood model, which measures the impact of central (e.g. argument quality) and peripheral (e.g. credibility) cues on traveller information-sharing behaviour corresponding with social presence on social media. The results of an empirical analysis of 527 respondents, who were experienced in travel information adoption via social media, were examined. Our findings revealed that argument quality had a positive effect on perceived usefulness and source credibility positively affected perceived usefulness and social relationships. Perceived usefulness had a significant positive effect on social relationships. Both perceived usefulness and social relationships affected travel information adoption. Lastly, the levels of argument quality and source credibility perceived by social media members were found to differ according to the level of social presence.     

高职院校智慧校园与共享型教学资源体系建设模式研究

信息技术在高校教学、科研等领域发挥越来越重要作用。教育部教育信息化十年发展规划(2011-2020年)指出,推进教育信息化仍然是一项紧迫而艰巨的任务。在数字化校园建设基础上,提出智慧校园及共享型教学资源体系建设,大力发展信息化服务,促进教学改革创新,提升服务社会能力。     

未来大数据环境下的配用电通信网虚拟网络架构及应用

根据智能配电网的通信需求,本文提出了基于无线 Mesh 网和电力线通信网的智能配电网通信框架。在此框架的基础上,设计了一个遗传算法和启发式算法,为不同类型的业务分别建立虚拟网络并将其映射到异构的物理网络中,通过增加传输分集来保证实时业务的可靠性。通过仿真,验证两种映射算法在保证实时业务可靠性的基础上,使尽力而为型业务的吞吐率达到最大化。     

校园一卡通系统中的数据库安全技术分析

计算机技术的发展,对我们的信息管理产生了深远的影响。一卡通管理系统逐渐成为了校园数字化管理的一种趋势。数据库是校园一卡通管理的重要组成部分,校园一卡通系统数据库的安全隐患会导致敏感数据的泄露。如何防止可能存在的对一卡通数据库系统的各种攻击、破坏和欺诈,对校园一卡通系统的顺利运行起到至关重要的作用。     

智能卡COS操作系统高速下载的研究与实现

随着信息化时代的到来,智能卡作为信息化技术标志之一,在金融等方面的应用逐渐普及。智能卡操作系统不同于传统软件,它工作在嵌入式环境,具有硬件资源有限、工作环境不稳定等特点,所以其设计方法与传统方法有所不同。智能卡操作系统在投入使用之前,必须经过严格的测试,这是由嵌入式系统工作的特性决定的,因为当软件工作后出现漏洞时很难进行弥补。本文通过对智能卡下载机制的研究,改进设计以提高智能卡操作系统的下载速度,进而提高测试效率和缩短发卡时间。