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Limited power budget is becoming one of the most crucial challenges in developing supercomputer systems. Hardware overprovisioning which installs a larger number of nodes beyond the limitations of the power constraint is an attractive way to design next generation supercomputers. In air cooled HPC centers, about half of the total power is consumed by cooling facilities. Reducing cooling power and...
Currently, Massive Open Online Courses (MOOC) is having significant impact on E-learning by providing free campus curriculum for millions of viewers over the world. Most of MOOC mainly include literal tutorial, video course and easy quiz, but lack of an identical and easily operational experiment environment with durable data. It is crucial for participants to learn complicated courses involved practical...
HDFS has been widely used for storing massive scale data which is vulnerable to site disaster. The file system backup is an important strategy for data retention. In this paper, we present an efficient, easy- to-use Backup and Disaster Recovery System for HDFS. The system includes a client based on HDFS with additional feature of remote backup, and a remote server with a HDFS cluster to keep the backup...
For the next generation mobile video broadcasting, especially in-band solutions that serves the mobile devices, a limited feedback scheme via cellular channel polling is feasible to give accurate real-time information on the broadcast receivers' channel erasure rate, and decoding buffer status. In this work, we propose an AL-FEC coding degree scheme based on this feedback, to achieve a better decode...
Recent years people have witnessed a surge of interest in APT attack, due to its complex and persistent attack characteristics. In order to prevent APT attacks, this article studies and analyzes a large number of APT attack cases which have been disclosed, gives an overview of APT attack lifecycle and attack techniques. This paper discusses the purposes of APT attacks and APT attack characteristics...
Given ever-increasing circuit complexities, recent trends are driving the requirement for distributed timing analysis (DTA) in electronic design automation (EDA) tools. However, DTA has received little research attention so far and remains a critical problem. In this paper, we introduce a DTA framework for large designs. Our framework supports (1) general design partitions in distributed file systems,...
Traditional workflow design tools which only provide the choreography of simple flow chart and do not provide a graphical configuration for access to a service, are unable to meet user demand for services. The article expands the Activiti Designer open source framework. It maintains communication through the bottom of the enterprise service bus, provides the registration services (OSGI, WebService,...
Since the cloud computing technology is commonly developed, some new inventions of the Internet are required to operate in hybrid architecture with both virtualized and physical components. To evaluate these kinds of innovations in testbeds, the ability of emulation is the key point. This paper presents a prototype design implemented in a network testbed for providing virtual nodes. By doing this,...
This paper introduces a novel content classification scheme in video-on-demand (VoD) based on the emerging standard of MPEG media transport (MMT). Content classification is necessary and reasonable, due to the fact that a better user experience may be obtained if the requested video is organized and presented in different ways according to various user requirements and/or video popularities. For this...
Cooling system is one of the key components in data centers and consumes nearly half of the total energy. For the safety and efficiency of a data enter, cooling system should guarantee all the servers running in a suitable temperature. Thus, the cooling efficiency becomes lower as the occurrence of hot spots, because the whole cooling system will accordingly work in a strong cooling mode, which leads...
PoC is a group communication service based on cellular network packet domain carrier. Aiming at the demand of command and dispatch, this paper reports the design of the PoC system over TD-SCDMA/CDMA/WCDMA multi-mode heterogeneous cellular networks and introduces some key technologies which are adopted. we achieve the testing results in the actual commercial network, discuss the existing problem, and...
Push-to-Talk over Cellular (PoC) system is ideal for group communication in many cooperative work environments because of its wider coverage and more flexibility than traditional trunk communication systems. The long session-setup-delay is an important problem that must be solved before the commercial application of PoC system. Many research works have been done to solve it in some mobile networks,...
With the advancement of network virtualization, physical and virtual network managements become more and more complex and difficult. This article presents a framework, Hierarchical Management System of Virtual Network (HMSVN), including the functions of network virtualization and the features of hierarchical management. The system is implemented on NetFPGA to provide the solution for virtual network...
In the emergency rescue process after disaster arriving, ARGIS can provide accurate rescue data for rescuers and command center in time and make rescuers and command center work in collaboration. Consequently, it can raise emergency response's speed and rescue efficiency. For getting emergency rescue spatial data on the disaster area quickly and improve rescue collaboration ability, this paper discusses...
Managing temperature has become an important concern in modern processor and other microelectronic chips. The problem has become especially severe as the ability to reduce supply voltage has slowed. As a result, the number of devices per unit area is sca ing up faster than the power density is scaling down. This requires more expensive cooling solutions to keep the chip and its local hotspots cool,...
The requirements of OLAP applications increase rapidly by dramatically increased data volume, users, query volume and query complexity. The requirement for shortening update period in data warehouse is another crucial factor for a scalable OLAP application. In this paper, we propose a scalable OLAP prototype to support the query processing with increasing data volume by distributing the whole fact...
Web information systems are now widely used. These systems generally provide specific service in accordance with users' identities. To use these services, users are required to conduct identity authentication separately when logging in different web applications and systems. For the sake of security and access control, it is infeasible to use a unique common identifier and password for all systems...
Geographic information systems (GIS) are now widely used. WebGIS, pushed by keeping increasing information resources, enriches functions and content of GIS under WWW framework. We propose a mobile agent-based middleware for WebGIS, called M4WebGIS, which consists of a group of coordinated agents for users to retrieve geographic information. Function logic of server part, processing logic of client...
Network security problems emerge in an endless stream and cause the inestimable damage. To solve network security problems efficiently, it is not enough to make good protection at nodes or protect networks from outside attacks. Many network security problems should be solved efficiently in collaborative approaches which can integrate various resources over internet to defense network security. In...
One of the most useful features provided by virtual machine (VM) technologies is the ability to migrate running OS instances across distinct physical nodes. As a basis for many administration tools in modern clusters and data-centers, VM migration is desired to be extremely efficient to reduce both migration time and performance impact on hosted applications. Currently, most VM environments use the...
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