A Distributed Query Protocol in Wireless Sensor Networks

In wireless sensor networks, query execution over a specific geographical region is an essential function for collecting sensed data. However, sensor nodes deployed in sensor networks have limited battery power. Hence, the minimum number of connected sensor nodes that covers the queried region in a sensor network must be determined. This paper proposes an efficient distributed protocol to find a subset of connected sensor nodes to cover the queried region. Each node determines whether to be a sensing node to sense the queried region according to its priority. The proposed protocol can efficiently construct a subset of connected sensing nodes and respond the query request to the sink node. In addition, the proposed protocol is extended to solve the k-coverage request. Simulation results show that our protocol is more efficient and has a lower communication overhead than the existing protocol.     

制造执行系统在制丝线上的应用

为弥补企业计划层和生产控制层之间的断层,论述了MES在制丝生产线上的应用,包括MES的系统结构、实现功能及数据接口设计。     

纺织细纱车间制造执行系统

针对纺织厂细纱车间在生产管理方面的实际需求。结合数据库技术、网络技术、通信技术和总线技术。开发了一种主从式的系统体系结构。根据实际需求对车间的业务数据流程进行了分析。并对多Agent的生产调度模型进行了研究,还对系统的主要模块功能、通信协议、制造执行系统与ERP系统的集成技术以及数据库的安全性进行了详细介绍。实践表明,系统实现了细纱车间从计划、生产、监测、调度到统计分析的网络化管理。     

生产执行系统及其在卷烟工业中的应用

较详细地阐述了生产执行系统(MES)的定义、技术架构及功能,并根据卷烟企业的生产特点,以龙岩卷烟厂为应用实例,讨论了卷烟工业企业应用MES系统需做的实施准备,以及卷烟工业中实现的工序详细调度、资源分配和状态管理、基础数据和文档管理、过程工艺质量控制、生产过程实时监控、设备运行及维护管理、数据采集与统计分析等功能模块,并对其应用效果及发展前景进行了论述。     

试论质量体系认证和产品质量

针对设计系统贯标认证的情况,阐述质量体系要求和产品要求的区别以及质量体系认证和产品质量的关系;提出解决贯标认证与产品质量相脱节的措施。     

MES在烟机制造企业的构建

通过对DNC、ERP、PDM为代表的信息系统在烟机制造企业应用问题的梳理,发现在过程自动化与管理信息化之间存在的信息连通障碍,并构建MES来解决这一问题的功能模型,为企业实现高效的生产经营提供重要的技术支撑.     

Replay-based debugging of occam programs

Parallel programs are intrinsically non-deterministic, and therefore the techniques of cyclical debugging that are commonly used for sequential programs are not suitable for parallel ones. This paper proposes a method to reproduce Occam program behaviour. Saving information on the timer values input by the program and the guards selected at run-time on alternative commands allows program replay, i.e. it makes it possible to re-execute the program deterministically with the same inputs following the same instruction path. This enables the software developer to use tools such as debuggers and intrusive monitors to help identify program faults. After discussing possible implementations of the proposed technique, IRD (an interactive replay debugger for Occam programs) is described. Finally, the use of the IRD in a sample debug session is presented as an example.     

PDM系统在企业中的实施

以新疆石油管理局机械制造总公司PDM系统为例,介绍了企业在实施PDM系统前面临的问题、实施目标的确立、软件的选择和实施步骤与体会。     

执行力--企业生存之本

执行力是企业生存之本,执行力的精髓在于企业内将人员、战略、运营三个流程完美结合.做为一个企业的主要领导者和管理者,应高度重视执行力的培育.     

磷复肥设备几种常用衬里工艺

结合实践经验 ,对磷复肥设备的几种衬里工艺不断进行完善和总结 ,通过选择适宜的衬里工艺 ,掌握施工要点 ,并采取合理的使用和检修措施 ,较好地解决磷复肥设备的腐蚀问题 ,保证了生产正常运行 ,并节约了费用。