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.     

区块链环境下基于秘密共享的数字权限管理方案

针对数字权限保护中对内容加密密钥的安全保存和有效分发的需求,提出了一个区块链环境下基于秘密共享的数字权限保护方案。该方案主要包括系统初始化、内容加密、许可授权和内容解密4个协议。在该方案中,利用Pedersen可验证秘密共享方案和属性基加密（ABE）算法来实现内容加密密钥的保护和分发,将内容提供商从管理内容加密密钥的任务中解放出来,从而确保了密钥管理的安全性和灵活性。此外,基于区块链的数字权限保护方案具有信息公开透明、不可篡改等特点。安全性分析表明,该方案在区块链环境下是安全可行的;仿真实验结果表明,该方案能够以较低的开销实现数字内容的权限保护。     

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LabVIEW和智能负荷控制器的智能用电实验系统

基于LabVIEW虚拟仪器开发工具和智能负荷控制器,设计了一种适用于家庭的智能用电实验系统.采用Modbus-RTU协议,通过ZigBee无线通信,实现了上位PC机与下位机智能负荷控制器的通信.仿真结果表明,该系统操作方便,通信可靠,可实现智能负荷控制器的信息采集和远程控制.     

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。     

基于智能家居的一致性模型融合技术研究

在智能家居的自适应软件设计中,往往采用传统的模块构建技术。但由于其适应逻辑存在着低复用性、高复杂度等问题,很难验证模块组合后的正确性及有效性。为了满足开发过程中用户的增量性需求,针对适应逻辑的组合难题,提出把部分行为模型的形式化方法引入到适应行为的描述中。通过三值逻辑KMTS模型描述语言,提出一致性模型的判断方法以及融合算法,以提供明确的适应模型在线融合支持。最后通过智能家居中的一个模型实例来分析并验证融合后的适应逻辑。