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Android’s permission system offers an all-or-nothing choice when installing an app. To make it more flexible and fine-grained, users may choose a popular app tool, called permission manager, to selectively grant or revoke an app’s permissions at runtime. A fundamental requirement for such permission manager is that the granted or revoked permissions should be enforced faithfully. However, we discover...
It has been well recognized that network transmission constitutes a large portion of smartphone energy consumption, mainly because of the tail energy caused by cellular network interface. Traffic offloading has been proposed to reduce energy by letting a smartphone offload network traffic to its neighbors in vicinity via low-power direct connections (e.g., WiFi Direct or Bluetooth). Our experiments...
Grid middleware is a kind of important service management tool and is composed of different interaction units. The units of a grid middleware do not interact in random ways and are very well connected. As shown in this paper, irrespective of the specific features of each grid middleware analyzed, the final outcome of grid middleware is a small world, hierarchical component diagram with well-defined...
Since its introduction in 2004 by Google, MapReduce has become the programming model of choice for processing large data sets. Although MapReduce was originally developed for use by web enterprises in large data-centers, this technique has gained a lot of attention from the scientific community for its applicability in large parallel data analysis (including geographic, high energy physics, genomics,...
Grid has been proved to be a promising technology for integrating heterogeneous resources. However, with the emerging of various Grid middle wares, the heterogeneous problem also occurs for Grid middleware themselves, as well as for the Grid services developed on those middle wares, which is an obstacle for the interoperation. SOA(Service Oriented Architecture) has been introduced into the development...
Warcraft III is one of the most popular Multiplayer Online Game (MOG) games, where users are designed to interact with support of a dedicated server. PKTown is a P2P-based third-party middleware developed to replace the dedicated servers. This paper presents the scalability and robustness of PKTown 2.0 architecture. The evaluation demonstrates the efficiency of the architecture.
During the development of a distributed application, programmers usually involve many programs. These programs have different IP addresses and different ports. Sometimes, they even have a same port. For instance, in P2P environment, peers usually use the same port to communicate with each other. We often need tens of computers to develop such a distributed application. Unfortunately, not each one...
Agent-based grid data loading method aims at integrating heterogeneous hospitalspsila information systems into a medical information exchange platform based on grid middleware. It collects distributed data sets for decision support system, which makes data sources expanded from independent database modes to medical information systems in wide area. Virtual data access with grid service improves data...
The research about the interaction between grid environments and users is becoming popular. Many scientists propose the integration for Web 2.0 technologies and grid computing. In this paper, we propose a flexible Web-based framework for grid applications - WAGA, which tries to bridge the gap between grid middleware and grid applications. WAGA provides a WYSIWYG (what you see is what you get) way...
Many grid middleware such as Globus Toolkit and GPE have started to support virtual machines. They implement the remote control of virtual machine by grid service and make use of virtual machinespsila function of quick deployment to construct the execution environment of grid application fast. In order to support virtual machine in grid environment, VMGrid (Virtual Machine Grid) is presented. All...
Peers in multiple P2P applications execute overlapped operations with different implementation, like neighbour management, resource publish/lookup, delay investigation, which leads to poor interoperability and unnecessary network load. Peers contribute their resources only when they stay in same application. We propose a P2P middleware, called Ripple, to accomplish common functions in a layered architecture...
Peer-to-peer (P2P) system can support service for lots of end users with little hardware investment, which suits for the efforts to lower down the service cost for multiplayer online games (MOG). In this paper, we introduce PKTown, a P2P middleware inserted into Star Craft and the network layer. PKTown captures all packets generated by Star Craft. We apply application layer multicast (ALM) to transmit...
In this paper, we propose a novel scheme that can be used to build high performance and high available database cluster. This scheme employs a middleware approach, which can replicate the databases on the server nodes of a cluster and keep them consistent during the fly. Read-one-write-all strategy is used to execute the read only queries of the concurrent transactions in parallel so as to improve...
Grid computing is becoming more and more attractive for coordinating large-scale heterogeneous resource sharing and problem solving. From the viewpoint of decentralization and interoperability, we add agent layer based on ChinaGrid support platform (CGSP) system services. By describing these agent technologies in detail, we prove that agents can be implemented in WSRF specification as a Web service...
The emerging service grids bring together various distributed application-level services to a 'market' for clients to request and enable the integration of services across distributed, heterogeneous, dynamic virtual organizations. However, there are a number of applications with the requirement of time constraints. We propose a real-time strategy in service grid architecture. We also extend the OGSI...
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