浅谈我国旋转防喷器技术的现状与发展

介绍了我国旋转防喷器技术的发展现状，分析了几种不同类型旋转防喷器的结构特点，指出旋转防喷器的发展方向及其与国外同类技术之间的差距。     

广电城域网中IP地址的规划

介绍广电城域网IP地址规划、分配的原则和方法以及利用IP地址计算器工具软件协助实现IP地址的计算等。     

Data monitoring and sports injury prediction model based on embedded system and machine learning algorithm

Managing sports performance is very important in the sports industry. Performance, the executives, centers on boosting competitor execution and decreasing the danger of injury. Several factors contribute to these goals, including player health, emotional status, exercise load and physical intensity requirements. Generally speaking, injury prediction is an essential component of injury prevention, and successful identification of injury prediction is a primary indicator for effective prevention. The proposed Artificial Neural Network (ANN) objective is to develop and use early-doing ability and exercise load data to validate a hierarchical machine learning prediction system with accurate detection of player injuries. The physical and workload that requires detection of this early personalized damage can be avoided with specific help. The framework is used to test 21 soccer players’ sports information from various sources, including gathered and inside burden information, outside burden information, and review information. The entirety of this information is fused into the proposed framework to improve the exactness of harm expectation. This calculation distinguishes competitors in danger of injury, with their early intervention available.     

供应链环境下安全的RFID认证方案

供应链环境下RFID安全认证方案不仅要保证各节点的隐私安全,还应该满足供应链管理需求。针对现有方案存在不能同时兼顾两者的不足,提出一种基于"双重签名"的认证方案。标签的认证信息先后采用访问密钥和认证密钥进行双重签名生成,只有同时具备这两个密钥才能识别标签身份。该方案既可以实现标签在供应链内的安全传递,又能方便供应链的管理。分析表明,该方案较现有方案优势明显。     

自适应动态信任关系量化模型的研究

提出一个新的自适应动态信任关系量化模型。该模型在建立基于历史函数的直接信任计算方法和基于路径函数的反馈信任聚合模型的基础上,引入自信因子和反馈因子来自动建立和动态调节直接信任与反馈信任的权重。仿真实验结果表明,与现有模型相比,该模型能够有效提高可信决策的准确性。     

First-Principles Study on the (111) Surface of Half-Metallic CsN

Using the full-potential local-orbital minimum-basis method based on electronic structure calculations, we have probed the structural, electronic, and magnetic properties of the (111) surface of CsCl-type CsN. Our results indicate that bulk CsN is found to be a half-metallic ferromagnet at equilibrium lattice constant with a total spin magnetic moment of 2.0 μB per formula unit. At the same equilibrium lattice constant, the Cs-terminated (111) and N-terminated (111) surfaces preserve the half-metallic characteristics of the bulk CsN. In addition, we also show that the Cs-terminated (111) surface is energetically more stable than the N-terminated (111) surface.     

基于PLC的模拟量闭环控制系统PID的实现

文章对模拟闭环控制系统的原理、变送器的选择方法及闭环控制系统主要性能指标进行了描述,介绍了PID控制器的数字化过程及PID指令向导生成PID程序的步骤,通过S7-200 SMART PLC编程实现该控制过程,并进行了参数整定,达到了控制效果。     

加工氧枪喷头的专用数控机床的设计

应用现代数控技术,以X52K普通立式升降台铣床的床身、工作台及横向进给滑板等为基件,根据氧枪喷头的加工特性,研究开发了锻压组合式氧枪喷头加工的专用数控设备。实践表明：该专用机床能较全面地加工出各种系列的氧枪喷头产品,且加工效率和产品质量都得到明显的提高。     

可扩展SSM协议的设计与仿真

指定信源域间组播SSM主要是为了解决域间组播地址变化问题而提出的,它有效地解决了ASM域间组播路由的复杂性,并具有更好的会话完整性和安全性,但仍然面临严重的状态可扩展性问题.分析了SSM中的可扩展性问题,在此基础上就SSM中转发状态的可扩展性问题,提出了一种采用分枝节点算法的改进的SSM协议,可以提高SSM协议的可扩展性,描述了工作原理,并基于NS-2进行了性能评估.