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。     

基于区块链的新型存储模型慈善系统

现如今的慈善领域总会面临着数据无法公开透明的问题,人们无法对不公开数据的慈善组织报以信任,即使公开了数据,也要面临着数据造假的质疑.针对现有慈善组织存在的公信力不足、便捷性低,以及善款流向不透明等问题,本系统采用区块链技术,通过设计新型数据存储模型,将上传的项目数据按照所需的要求进行加解密等操作,使得数据具有保密性;同时将交易数据进行链上存储,利用区块链不可篡改可追溯等特性,将所有经过本系统的交易数据进行上链操作,使得交易数据变得公开透明,同时无法对已经完成的交易的数据进行修改,从而使整个系统具有足够的公信力,有效地弥补了传统慈善系统的数据不公开,同时可能存在数据造假的不足.     

A synthetical development approach for rehabilitation assistive smart product–service systems: A case study

Digital transformation (DT), the combination of information, computing, communication and connectivity technologies, which has triggered an effective upgrade of different aspects of market strategy, customer experience etc. Nowadays, rehabilitation assistive devices (RADs) are evolving to be more digital, intelligent and personalized. Digitalization and servitization have fostered to an emerging business model—the smart product–service system (Smart PSS). Therefore, DT of the RADs’ industry advocates not only the design of products and functions, the more important is the management of service processes and resource integration. With the increase in the elderly and disabled population, the requirement for RADs is becoming more urgent. However, research on Smart PSS for RAD is still limited. The rehabilitation assistive smart product–service systems (RASPSS) was introduced into the development of RADs based on the “Design and Management of DT” strategy through the service design of assistive devices and user requirements analysis. Further, an integrated design of RAD and Smart PSS has been created, a development method of RASPSS proposed, the theoretical model of the Smart PSS based on RADs built. To specify the service framework, this case study discusses the development of a home rehabilitation assistive system for femoral stem fracture patients. This paper evaluates the usability of the system, the results of which prove usability and effectiveness of the RASPSS development method. The RASPSS development model is designed to meet needs of stakeholders, improve the user rehabilitation experience, promote the service innovation of Smart PSS, bring certain market benefits of rehabilitation aids and create social value.     

基于局部概率抽样的标签噪声过滤方法

分类学习任务中,在获取数据的过程中会不可避免地产生噪声,特别是标签噪声的存在不仅使得学习模型更复杂,而且容易造成过拟合并导致分类器泛化能力的下降。标签噪声过滤算法虽然在一定程度上可以解决上述问题,但是仍然存在噪声识别能力较差、分类效果不够理想以及过滤效率低等问题。针对这些问题,提出一种基于标签置信度分布的局部概率抽样方法来进行标签噪声过滤。首先利用随机森林分类器对样本的标签进行投票,从而获取每个样本的标签置信度;然后根据标签置信度的大小,将样本划分为易识别样本和难识别样本;最后分别采用不同的过滤策略对样本进行过滤。实验结果表明,在标签噪声存在的情况下,所提方法在大多数案例上能够保持较高的噪声识别能力,并且在分类泛化性能上也具有明显优势。     

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.     

隐私保护算法在智能电网中的应用

数据聚合是智能电网中的重要环节,在数据聚合的过程中应达到准确、安全、高效节能等指标.通过对DGK密码体制与盲签名加密钥分配技术两种方法的对比分析,得出盲签名加密钥分配技术更加安全可靠,同时计算开销较小的结论.     

基于LBS的个性化手机菜品推荐系统设计与实现

为满足用户"随身、随时、随地"的个性化服务需求,设计一款基于位置服务(LBS)的个性化菜品推荐系统。在系统中,首先通过对用户的位置感知,记录每个用户的用餐信息;然后通过现有的选择过程或相似关系来获知用户的潜在兴趣;再对当地餐馆和菜肴的信息进行过滤,将用户可能感兴趣的餐厅和菜品推荐给他们。     

Novel plug-configure-play ZigBee-based smart home system

The key purpose of a smart home system is to provide people with a better indoor life experience using the technology of Internet of Things. However, there are some limitations which make the current smart home system impractical, such as high cost, complex installation, poor flexibility and maintainability. In this paper, a novel plug-configure-play ZigBee-based smart home system is proposed to provide repeatable use and improve flexibility and maintainability with the reductions of cost and complexity, which can be customized and reconfigured without redevelopment. In this system, new sensors can be flexibly added through different interfaces on the ZigBee nodes and the sensor network layer is transparent to the users. Therefore, by using our method, users can customize and use the smart home system simply by configuring the sensors information via software on the application layer.     

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。     

基于平衡树的智能电网数据采集路由算法

在智能电网中,与传统路由协议不同,突发性拥塞不再是数据采集的主要风险,风险的新来源是数据流过度集中在网络的关键节点而导致的拥塞。为此,提出了一种能够实现数据平衡的数据采集路由机制用以克服网络拥塞。首先,该机制抽象出配用通信网络的数学模型;其次,针对无线网状网络( WMNs)路由协议,以节点排队队列长度作为决策参数建立路由度量模型(数据平衡度量模型,DBMM),并以度量值最小作为决策条件,设计了基于平衡树的路由算法(基于DBMM的路由算法,RA-DBMM)。最后,在Matlab环境下进行仿真实验,对比分析RA-DBMM和经典Bellman-Ford的性能差异。实验结果表明：RA-DBMM能够有效地改善数据拥塞问题,提高系统可靠性和吞吐量。