Researches related to wireless sensor networks primarily concentrate on Routing, Location Services, Data Aggregation and Energy Calculation Methods. Due to the heterogeneity of sensor networks using the web architectu...Researches related to wireless sensor networks primarily concentrate on Routing, Location Services, Data Aggregation and Energy Calculation Methods. Due to the heterogeneity of sensor networks using the web architecture, cross layer mechanism can be implemented for integrating multiple resources. Framework for Sensor Web using the cross layer scheduling mechanisms in the grid environment is proposed in this paper. The resource discovery and the energy efficient data aggregation schemes are used to improvise the effective utilization capability in the Sensor Web. To collaborate with multiple resources environment, the grid computing concept is integrated with sensor web. Resource discovery and the scheduling schemes in the grid architecture are organized using the medium access control protocol. The various cross layer metrics proposed are Memory Awareness, Task Awareness and Energy Awareness. Based on these metrics, the parameters-Node Waiting Status, Used CPU Status, Average System Utilization, Average Utilization per Cluster, Cluster Usage per Hour and Node Energy Status are determined for the integrated heterogeneous WSN with sensor web in Grid Environment. From the comparative analysis, it is shown that sensor grid architecture with middleware framework has better resource awareness than the normal sensor network architectures.展开更多
针对现有无线传感器网络的信任模型未考虑风险因素,导致不能有效处理恶意节点攻击的问题,采用一种基于风险评价的信任模型(Risk evaluation based trust model,RBTM)。RBTM的框架由检测模块、信任计算模块和决策模块组成,并考虑上下文...针对现有无线传感器网络的信任模型未考虑风险因素,导致不能有效处理恶意节点攻击的问题,采用一种基于风险评价的信任模型(Risk evaluation based trust model,RBTM)。RBTM的框架由检测模块、信任计算模块和决策模块组成,并考虑上下文因素的影响。计算信任度时同时考虑推荐信誉值和风险值的影响;风险值的计算借用风险评估函数和风险信誉调节函数实现。研究结果表明:RBTM能够有效抵抗恶意节点的攻击,与已有的信任模型相比具有更大的灵敏性,较大程度地提高了对恶意行为的检测成功率,可以使节点之间更有效地建立信任关系。展开更多
为更好地解决网格环境下分布式跨域授权问题、增强授权功能的可扩展性和可复用性,构建了基于可扩展访问控制标记语言(extensible access control markup language,XACML)规范的网格授权框架。在该框架的基础上,依照Web服务资源框架和We...为更好地解决网格环境下分布式跨域授权问题、增强授权功能的可扩展性和可复用性,构建了基于可扩展访问控制标记语言(extensible access control markup language,XACML)规范的网格授权框架。在该框架的基础上,依照Web服务资源框架和Web服务通知规范,设计实现了基于XACML策略引擎的网格授权服务。将复杂的模块交互调用封装在授权框架内,通过简单易用的服务接口实现域间互操作时的权限分配。实现结果表明,该框架更加灵活,适用于动态、异构的网格环境。展开更多
文摘Researches related to wireless sensor networks primarily concentrate on Routing, Location Services, Data Aggregation and Energy Calculation Methods. Due to the heterogeneity of sensor networks using the web architecture, cross layer mechanism can be implemented for integrating multiple resources. Framework for Sensor Web using the cross layer scheduling mechanisms in the grid environment is proposed in this paper. The resource discovery and the energy efficient data aggregation schemes are used to improvise the effective utilization capability in the Sensor Web. To collaborate with multiple resources environment, the grid computing concept is integrated with sensor web. Resource discovery and the scheduling schemes in the grid architecture are organized using the medium access control protocol. The various cross layer metrics proposed are Memory Awareness, Task Awareness and Energy Awareness. Based on these metrics, the parameters-Node Waiting Status, Used CPU Status, Average System Utilization, Average Utilization per Cluster, Cluster Usage per Hour and Node Energy Status are determined for the integrated heterogeneous WSN with sensor web in Grid Environment. From the comparative analysis, it is shown that sensor grid architecture with middleware framework has better resource awareness than the normal sensor network architectures.
文摘针对现有无线传感器网络的信任模型未考虑风险因素,导致不能有效处理恶意节点攻击的问题,采用一种基于风险评价的信任模型(Risk evaluation based trust model,RBTM)。RBTM的框架由检测模块、信任计算模块和决策模块组成,并考虑上下文因素的影响。计算信任度时同时考虑推荐信誉值和风险值的影响;风险值的计算借用风险评估函数和风险信誉调节函数实现。研究结果表明:RBTM能够有效抵抗恶意节点的攻击,与已有的信任模型相比具有更大的灵敏性,较大程度地提高了对恶意行为的检测成功率,可以使节点之间更有效地建立信任关系。
文摘为更好地解决网格环境下分布式跨域授权问题、增强授权功能的可扩展性和可复用性,构建了基于可扩展访问控制标记语言(extensible access control markup language,XACML)规范的网格授权框架。在该框架的基础上,依照Web服务资源框架和Web服务通知规范,设计实现了基于XACML策略引擎的网格授权服务。将复杂的模块交互调用封装在授权框架内,通过简单易用的服务接口实现域间互操作时的权限分配。实现结果表明,该框架更加灵活,适用于动态、异构的网格环境。
