A Secure Blockchain-Based Vehicular Collision Avoidance Protocol: Detecting and Preventing Blackhole Attacks

This work aims to examine the vulnerabilities and threats in the applications of intelligent transport systems,especially collision avoidance protocols.It focuses on achieving the availability of network communication among traveling vehicles.Finally,it aims to find a secure solution to prevent blackhole attacks on vehicular network communications.The proposed solution relies on authenticating vehicles by joining a blockchain network.This technology provides identification information and receives cryptography keys.Moreover,the ad hoc on-demand distance vector(AODV)protocol is used for route discovery and ensuring reliable node communication.The system activates an adaptive mode for monitoring communications and continually adjusts trust scores based on packet delivery performance.From the experimental study,we can infer that the proposed protocol has successfully detected and prevented blackhole attacks for different numbers of simulated vehicles and at different traveling speeds.This reduces accident rates by 60%and increases the packet delivery ratio and the throughput of the connecting network by 40%and 20%,respectively.However,extra overheads in delay and memory are required to create and initialize the blockchain network.

Design of Out-of-Band Protocols to Transmit UHDTV Contents in the CATV Network

The goal of an UHDTV is to broadcast digital video contents which is 16 times the pixel resolution of HDTV. As the resolution is increased, the UHDTV requires a transmission technology to support very high data transfer rate. In this paper, we propose two out-of-band protocols to transmit UHDTV contents in a CATV network: an OOB-based protocol and a DSG-based protocol. The former may be a short term solution which is well suitable for a traditional CATV network and the letter may be a long term solution which is adoptable for a CATV network equipped with DOCSIS functionalities. In order to transfer 200 Mbps UHDTV contents, proposed protocols use a channel bonding mechanism which combines several QAM channels. We propose CATV network architectures to support an UHDTV service with a channel bonding mechanism, and design the format of messages to share the information of bonded channels between a headend and a STB. We develop an OPNET simulator and ascertain successful transmission of UHDTV contents.

A Formal Approach to the Design of Network Protocol

This paper presents the network service model and protocol model, and gives a brief introduction to a high level Petri net called EPr/TN net system, which serves as the formal specification tool for network protocol. Finally, the general methods for the

Cross-Layer Design Based Optimized Link State Routing Protocol for Wireless Mesh Networks

A proactive routing protocol CL-OLSR （cross-layer based optimized link state routing） by using a brand-new routing metric CLM （cross-layer metric） is proposed. CL-OLSR takes into account four link quality impact factors in route calculation through the cross-layer operation mechanism： the node available bandwidth, the node load, the link delivery rate, and the link interference, and thus the effect of route selection is optimized greatly. The simulation results show that the proposed CL-OLSR protocol can not only improve the network throughput to a large extent, but also reduce the end-to-end delay, while achieving load balance route results.

嵌入式物联网融合通讯协议实践教学设计

为使学生能够融会贯通嵌入式物联网分散在各门专业课的知识,本文提出一个以通讯协议为纽带的综合实践课程设计方法。该方法应用Zigbee无线协议,串口协议和网络协议,整合现有的专业课知识。通过设计基于硬件和软件的实践项目,同时以嵌入式物联网的典型问题为导向,引导学生加深理解专业知识。实践的结果表明,采用该教学方法的嵌入式物联网综合实践课程能够在一定程度上提高学生对专业知识的综合理解和应用。

Toward a Multi-Hop, Multi-Path Fault-Tolerant and Load Balancing Hierarchical Routing Protocol for Wireless Sensor Network

This paper describes a novel energy-aware multi-hop cluster-based fault-tolerant load balancing hierarchical routing protocol for a self-organizing wireless sensor network (WSN), which takes into account the broadcast nature of radio. The main idea is using hierarchical fuzzy soft clusters enabling non-exclusive overlapping clusters, thus allowing partial multiple membership of a node to more than one cluster, whereby for each cluster the clusterhead (CH) takes in charge intra-cluster issues of aggregating the information from nodes members, and then collaborate and coordinate with its related overlapping area heads (OAHs), which are elected heuristically to ensure inter-clusters communication. This communication is implemented using an extended version of time-division multiple access (TDMA) allowing the allocation of several slots for a given node, and alternating the role of the clusterhead and its associated overlapping area heads. Each cluster head relays information to overlapping area heads which in turn each relays it to other associated cluster heads in related clusters, thus the information propagates gradually until it reaches the sink in a multi-hop fashion.

基于ZigBee技术的机械设备状态监测系统设计与实现

为实现机械设备运行状态的实时监测和故障预警,设计基于ZigBee短距离无线通信技术的机械设备状态监测系统。该系统通过数据采集模块获取机械设备的电流、振动、温度等状态信号,经ZigBee无线模块的终端节点和协调器节点将信号上传至上位机监控中心。为了提高信号质量,设计信号调理电路进行A/D转换、滤波、放大。最终在液晶显示器上实时、直观地呈现监测结果,对提升机械设备管理效率和延长机械设备使用寿命有积极帮助。

控制工程中的通信协议设计与优化

在现代控制工程中,通信协议的设计和优化对于实现控制系统的高效运行至关重要,而设计一个适用于特定控制系统的通信协议是一项复杂的任务。鉴于此,本文针对控制工程中,通信协议的设计与优化方式展开详细分析,从而为控制工程领域提供更有效、高效的通信协议设计与优化策略。

A Contention-Based MAC and Routing Protocol for Wireless Sensor Network

Advance development of wireless technologies and micro-sensor systems have enabled Wireless Sensor Network (WSN) to emerge as a leading solution in many crucial sensor-based applications. WSN deploys numerous resource-constrained sensor nodes which have limited power supply, memory and computation capability in a harsh environment. Inefficient routing strategy results in degraded network performance in terms of reliability, latency and energy efficiency. In this paper, a cross-layer design, Contention-based MAC and Routing protocol is proposed, termed Contention/SNIR-Based Forwarding (CSBF) protocol. CSBF utilizes the geographical information of sensor nodes to effectively guide the routing direction towards destination node, thereby enhancing reliability. Furthermore, Signal-to-Noise-plus-Interference Ratio (SNIR) metric is used as a routing parameter to guarantee high quality link for data transmission. A Contention-Winner Relay scheme is utilized to reduce the delays caused by the contention procedure. Energy efficiency is also improved by introducing sleep mode technique in CSBF. The simulation work is carried out via OMNeT++ network simulator. The performance of CSBF is compared with other existing routing protocols such as AODV and DSDV in terms of packet delivery ratio (PDR), average end-to-end (ETE) delay and energy consumption per packet. Simulation results highlight that CSBF outperforms AODV and DSDV protocols in respect of PDR and energy efficiency. CSBF also has the most consistent overall network performance.

A Wireless Sensor Network Ad-Hoc Designed as Anti-Theft Alarm System for Photovoltaic Panels

Photovoltaic (PV) systems have attracted increasing attention in last years as well as Wireless Sensor Networks (WSNs), which have been used in many application fields. In PV plants, especially in ground installations, a lot of thefts and damages occur due to the still high cost of the modules. A new experimental WSN ad-hoc has been designed to be an anti-theft alarm system. Each node of the network is directly installed under each PV string and it is equipped with an accelerometer sensor capable to detect a minimum displacement of the panel from its steady position. The WSN presents a star topology: a master node cyclically interrogates the slave nodes through RF link. It collects all the nodes responses and communicates though a RS-232 interface with a control PC checking the network status. When a slave node detects an alarm, continuous messages are sent to the control PC which turns on all the alarm signaling systems. The control PC is equipped with an open source operative system and software and provides for SMS, e-mail and sound-light signaling in case of alarm. It also communicates with a remote server where all the WSN information is stored. A first low cost experimental WSN has been already installed and it is working properly.

多参数水效在线检测系统的设计

设计了一种多参数模块化水效在线检测系统。取水和循环模块实现自动取水和循环;水效检测模块实时检测pH、电导率、浑浊度、硬度等水效参数和温度、压力、流量计等管路参数;数据处理模块对上述数据进行转换和分析。数据通信方式采用Modbus通信协议。检测机构通过上位机直观地了解用水产品水效情况,实现对目标水效的实时监控。所设计的多参数水效在线检测系统为用水产品水效检测提供了一个良好的解决方案。

基于对比分析的密码安全协议课程案例化设计

密码安全协议,又称密码协议,是基于密码学的消息交换协议,旨在网络环境中提供各种安全服务。该协议确保了通信中数据的保密性、完整性和可靠性,是密码学分支学科中涉及计算机网络、通信系统和信息安全领域的技术和方法。其目标是防止数据在传输过程中受到恶意篡改、窃取或伪造的威胁。由于密码安全协议涉及抽象概念的理解、高数学基础的要求以及实验环境和工具的限制等难点,教学内容和讲授方法一直是该领域的重要研究问题。本文基于对比分析法,提出了层次结构化的密码安全协议案例化教学设计,通过典型教学案例来深入剖析密码安全协议课程的学习,以加深学生对课程内容的理解和应用。

Cross Layer Design for Cooperative Transmission in Wireless Sensor Networks

Several protocols and schemes have been proposed to reduce energy consumption in Wireless Sensor Net-works (WSNs). In this paper we employ farcoopt, a cross layer design approach with the concept of coop-eration among the nodes with best farthest neighbor scheme to increase the Quality of Service (QoS), reduce energy consumption, increases performance and end-to-end throughput. We present cooperative transmission to connect previously disconnect parts of a network thus overcoming the separation problem of multi-hop network. We show that this approach improves connectivity over 50% compared to multi-hop approaches and reduces the number of nodes necessary to provide full coverage of an area up to 35%. Simulation results show that on increase of data rates i.e. packet the network life time increases in farcoopt as compared to tra-ditional multi hop approach. The result of this analysis is presented in this work.

基于网络辅助全双工无蜂窝系统的通感一体化协议设计

第六代移动通信技术的研究受到了广泛关注。随着通信和雷达频率范围的重叠,学者们对通感一体化的研究产生了浓厚兴趣。然而,分布式联合感知技术目前仍面临自干扰和互干扰等物理层挑战。基于第五代新空口协议,提出了一种针对网络辅助全双工无蜂窝系统的通感一体化协议方案,增设了感知解调参考信号。这一创新旨在通过低成本的改动,实现高质量的高通感一体化性能。该方案有效地解决了无蜂窝场景中接入点之间的感知干扰问题,它使得接收机能够准确地识别信源并估计信道,从而在确保通信性能的同时,实现精确的感知功能。

基于云计算技术的计算机网络安全存储系统设计

随着云计算技术的快速发展,传统的存储系统面临着日益增长的数据量和不断变化的网络环境的挑战。因此,本文设计了一种基于云计算技术的计算机网络安全存储系统。首先,详细分析了计算机网络安全存储问题与协议,调研了各种网络存储系统,并分析了协议各种要求。其次,提出了一种基于云计算技术的计算机网络安全存储系统的设计思路和结构。再次,设计了一种高效的计算机网络安全存储算法,以实现快速响应和高效利用存储资源。最后,通过实验验证了设计方案的有效性。结果表明,所提出的计算机网络安全存储系统在安全性、可靠性和性能方面具有显著优势。

基于MVVM架构的智能储库系统

智能储库系统具备对起重机进行智能调度的功能,通过减少或替代人工操作达到提高生产效率并降低运营成本的目的。文中详细叙述了智能储库系统强大的记录和追踪货物信息能力,并对系统中各功能进行创新设计,从而实现精准的库存管理以及根据需求变化智能调度起重机。在库位管理方面,仓库被划分为不同的区域,根据货物的大小分配库位,这样可以进一步提高存储和检索效率。调度系统掌握货物的位置信息,能够制定合理的路线规划,并将任务分配给起重机执行,以实现多台起重机的协同作业。

自适应平台试验在临床研究中的应用

适应性设计以动态调整试验设计、减少资源浪费、提高试验效率等优势突破了新药研发的竞争态势,逐渐满足临床需求。近年来,结合适应性设计的平台试验作为一种创新研究模式,为新药研发增添了动力。本文简要概述适应性设计的研究进展、内容及特点、设计类型、统计分析方法和案例解读,介绍自适应平台试验的概念、类型及应用,以期为深入探索临床试验和新药研发提供科学参考。

口腔医疗器械临床试验方案设计要点的把控

基于口腔医学专业和口腔医疗器械的特点,探讨如何在口腔医疗器械临床试验方案的设计过程中把控纳排标准制定、对照设置、疗效评估、盲法设计、样本量计算等关键点。从口腔医疗器械临床试验起始阶段开始,理清思路,把控设计的要点,提升设计与实施的连贯性,以期防患于未然,提高临床试验质量。

一种适配多协议的水利物联网平台架构方案研究

本文聚焦智慧水利感知网建设,提出一种适配多协议的水利物联网平台架构方案,通过分层标准化架构和高度灵活的配置化、插件化设计,实现不同协议的差异化管理。详细阐述了方案的技术背景、设计细节及测试方案,并对方案性能进行了深入分析和评估。实验结果验证了本方案在兼容性、拓展性方面的较大优势,能够解决大规模终端设备接入带来的协议多样性问题,显著降低了水利物联网平台的运维成本。

油气井下多参数感知监测系统的设计与测试

为获取油气井下的关键参数,设计了一套井下智能监测系统。系统以PIC18F67K22作为主控芯片,集成温度、压力、位移、含水率、加速度传感器5种监测模块及电源模块。同时制定通信协议、配置相关参数并采用QT creator开发上位机,搭建了上位机与采集系统之间的完整通信体系,实现了多参数实时采集监测。通过模拟高温高压多参数变化实验、测试环境实时变化曲线,验证了监测系统的实时性、稳定性、准确性,结果表明该系统可满足实际需求,为油气井工具智能化提供了可靠方案。