基于Libmodbus的走航式海表温度传感器总线协议设计

针对船用海水表层水温观测以人工观测为主的现状，基于跨平台的Modbus库Libmodbus的走航式海洋表层水温监测系统，通过在船舶一侧布放处于船舶吃水线范围的水温传感器来采集表层水温信息。采用RS485/Modbus协议实现多站多点联网，构成分布式系统，进行海水表层温度的自动采集。上位机基于Modbus-RTU协议，并添加循环冗余校验以保证其对水温传感器的远程控制和表层水温信息采集功能的可靠性、安全性。该系统不仅运行稳定，操作简单方便，还具有可移植性和可扩展性。实验结果表明，该系统可以稳定可靠地监测海洋表层水温，实现表层水温的随船在线测量。     

Elucidating the diel and seasonal calling behaviour of Elachistocleis matogrosso (Anura: Microhylidae)

ABSTRACT

Acoustic monitoring provides the opportunity to study ecological processes that are difficult to assess with traditional surveys. Elachistocleis matogrosso is an anuran species, described in 2010, for which limited biological information is available. This study investigated the calling activity of the species in the north-eastern portion of the Pantanal, Brazil, a wetland area with marked seasonality between the dry and wet seasons. The calling activity of E. matogrosso was monitored using automated digital recorders in combination with automated signal recognition software over two different annual cycles. The species was vocally active only during the wet season (October – April), with a peak in November-December during the 2013–2014 annual cycle and in February-March during the 2015–2016 annual cycle. The peak calling activity occurred at dusk. This species has nocturnal habits and an explosive breeding activity. The detection of the species was intermittent, which suggests that environmental predictors or site-specific conditions might play an important role in species detection. Moreover, this intermittent occupancy indicated that surveys that employ traditional field techniques would likely fail to detect this species. We describe an effective protocol for detecting E. matogrosso with acoustic monitoring, which requires recording during 20 days in February from 17:01 to 05:00. Our procedure would be easy to adapt to other anuran species, and it could be used for investigating new localities and assessing population changes over time.     

基于生物信息的未知二进制协议聚类方法

协议聚类是协议逆向工程技术中非常重要的一步，针对二进制协议更加透明且满足的协议种类更加广泛的特点，提出了一种基于基因和蛋白质生物信息的二进制协议聚类方法，能够从原始序列角度对大量协议直接进行聚类.本文方法首先将原始二进制报文转化成四进制基因形式，使用快速聚类方法计算碱基两两组合的k-seed值生成距离矩阵，并用UPGMA计算最小距离生成树得到初始分簇；其次，将每一簇四进制协议报文转化成十六进制蛋白质链，得到序列更有语义的方式并采用基于改进mBed算法的聚类方法将其进行高精度聚类.通过对已知和未知协议单纯和混合场景下的测试表明，该方法能够对二进制协议实现高效并且高准确率的聚类，具有较高的应用价值.     

A Hybrid Formal Description Method Based on FSM,CSP and ADT for Communication Protocol

1.INTRODVCTIOWWiththedevelopmentofcomputernetworksandthedistributionofcomputersystems,thecomplexityandvarietyofcommunicationprotocolsandserviceshavebeengreatlyincreasedandsohavetheneedsofformaltechniquesforspecifying,validating,implementingandtestingprotocols.Moreattentionhasbeenfocusedonthissubjectofdevelopingformalmethodswhichaidtheprocessofprotocoldesign,andmuchworkontheformaltechniquesandtheiruseforprotocoldesign,implementationandtestinghasbeenp.erformedinrecentyears(SeeTable1)[2,31.T…     

集成数据库和文件系统的多数据库事务模型

提出了一种适合于集成文件系统和数据库系统的多数据库事务模型,讨论了事务模型组成元素全局事务管理器、事务提交协议和局部执行代理的设计与实现．     

Novell网上基于IPX协议的网络编程

介绍了Ｎｏｖｅｌ网的ＩＰＸ（互连包交换）协议的应用。通过该网络协议,实现了Ｎｏｖｅｌ网中的工作站之间的数据通信及远程作业的提交与执行的程序设计。由于ＩＰＸ实现了ＸＮＳ（ＸｅｒｏｘＮｅｔｗｏｒｋＳｙｓｔｅｍｓ）协议的互连网络数据报协议（ＩＤＰ）,可以直接与互连网上的其他工作站、服务器和设备相连接,因而具有很好的实用性。     

非电中央空调Modbus RTU从站设计

采用Modbus RTU通信协议实现系统信息化集成是天然气分布式能源站提高能源利用率的有效管理方法,能源站系统中采用PLC控制的非电溴化锂中央空调主机通常采用程序扫描的方式实现Modbus RTU通信,通信效率低,本文针对程序扫描通信方式的缺点详细介绍了OMRON C200HG系列PLC使用中断方式实现Modbus RTU从站通信的设计方法,提高了非电溴化锂中央空调主机和能源站系统的通信效率．     

基于BB84协议的量子保密通信网络流量控制策略

采用基于时间片轮转原理的流量控制及数据分发策略, 设计一种新的量子保密通信网络与经典网络相结合的组网技术方案, 解决了量子保密通信网络量子网关密钥池容量小及密钥生成速率较慢的问题. 利用该策略对三节点量子保密通信网络出接口进行流量监测, 检测数据结果验证了该方案的有效性及可行性.     

基于蓝牙的Ad Hoc网络研究与实现

为了组建一个更加便捷\, 稳定的无线通信网络(Ad Hoc网络), 方便无线终端用户之间通信, 结合蓝牙通信中一种主动的快速路由OLSR(Optimized Link State Routing Protocol)协议的工作原理, 设计相应算法并实现无线蓝牙网络的组建。在实际的环境中进行测试的结果表明, 在节点稳定的环境下, 网络可以成功组建, 并实现节点间的多跳通信。     

Ad Hoc网络中改进AODV QoS路由能量优化算法研究

无线AdHo网络是现阶段运用较广的一种对等式网络,具有良好自治性、快速组网和无基础设施的特点,可通过多个节点转发和无线信道实现数据间的传送。为更好地避免节点间能量的浪费,以AODV路由协议的节点思想为基础,根据各个节点剩余能量划分三类节点,以便选择出符合实际需求的、更优的传输路径,达到节省网络能耗、均衡节点能耗和提高带宽资源的目的。