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Energy consumption in data center has already become a widely concerned issue in cloud computing research. There are many studies on data center energy efficiency optimization. But most of them focus on the energy consumption of the servers and cooling equipment. Few of them considered data center network (DCN), which is also a significant energy consuming component. By applying newly emerged Software...
A WebGIS system based on Java Servlet mode is designed and implemented with GeoServer and OpenLayers. WebGIS server side performances are studied and a variety of solutions put forward for performance optimization, including JVM (Java Virtual Machine) performance tuning, the establishment and improvement of cache server, and using tmpfs (a memory-based file system) to save cache pictures, etc. A series...
For civil air defence geographic information data with large amount of data, data type complex, with geographic space information and attributes information, the ArcSDE the characteristics of the data storage and management, to achieve the geographic data pretreatment, geographic information management, visualization, inquires the statistics, the terrain analysis, navigation and positioning, information...
NETCONF, a new network management protocol, was released in 2006 which has overcome the weaknesses of SNMP. In the NETCONF protocol, it proposed a new mechanism subtree filtering, which allows an application to select particular XML subtrees. With the Subtree Filtering, specifically information of XML can be filtered out as a XML subtree. However, since the Subtree Filtering depends on the parsing...
NETCONF is a new protocol as the network becomes more and more complexity, which has a better capability administering lots of devices. However, the large scale network brings some trouble for implementing access control especially when administers need to deploy or update policies on each devices. In this regard, the architecture of centralized access control proxy server based on NETCONF is focused,...
The paper focuses on implementation of association pattern between the network performances and the general network faults. We use network simulation tool, OPNET, to accomplish network simulations of different network faults and different situations based on VoIP. Network performance parameters such as end-to-end delay, jitter, traffic dropped, queuing delay, link throughout, link utilization are...
In 2006, the IETF released its latest effort, NETCONF, a brand new network management protocol, which is based on the XML encoding method. The NETCONF protocol is thought to be able to meet the requirement of configuration management which SNMP fails to do well. The NETCONF protocol also performs better in other fields such as the efficiency, more flexible operations, etc. But, as a new protocol,...
With the increasing popularity of wireless sensor network and GPS technologies, uncertain data as a new type of data bring new challenge for the data processing methods. Data broadcasting is an effective means for data dissemination in mobile computing environment. Definition of the mean uncertainty ratio of data is presented and a broadcasting scheme UDBS is proposed for uncertain data dissemination...
Recent advances in wireless sensor network and GPS have made constantly-evolving data a new type of data which bring new challenge for the data processing methods. Data broadcasting is an effective means for data dissemination in an asymmetric communication network, like wireless network. Definition of the mean uncertainty ratio of data is presented and an on-line broadcasting scheme CEDB is proposed...
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