Qianni Deng

ShanghaiGrid: an Information Service Grid

The goal of the ShanghaiGrid is to provide information services to the people. It aims to construct a metropolitan‐area information service infrastructure and establish an open standard for widespread upper‐layer applications from both communities and the government. The Information Service Grid Toolkit and a typical application called the Traffic Information Grid are discussed in detail. Copyright

ShanghaiGrid in Action: The First Stage Projects towards Digital City and City Grid

The nearest goal of ShanghaiGrid is to going to connect all supercomputers in this metropolis together to form a sharing environment for massive storage and grid computing. The first stage projects of ShanghaiGrid comprise four sub-projects, including 1) research on environment, protocols and standards of information gird infrastructure; 2) development of system software for information grid and establishment of four major grid nodes; 3) development of peer-to-peer based virtual research platform; 4) research on the application of grid based traffic-jam control and guidance. This paper introduces the background of ShanghaiGrid, provides a glimpse at features and challenges of its sub-projects, and summarizes the general goal of them.

An economic-based resource management framework in the grid context

The economic mechanism is very suitable for solving the problem of resource management in the grid computing environment, and it can guarantee the interest of participators in the grid with fairness and efficiency. In this paper, we propose an economics-based resource management framework for grid computing, and then we focus on how to determine the price of resources with the economic mechanism. We present a general equilibrium method for general resources and a double auction method for special resources in the grid environment respectively. Simulations are performed and the experimental results indicate that the two methods are effective for corresponding application scenarios.

A double auction mechanism for resource allocation on grid computing systems

Considering dynamic, heterogeneous and autonomous characteristics of computing resources in grid computing systems and the flexibility and effectivity of economics methods applied to solve the problem of resource management, a double auction mechanism for resource allocation on grid computing systems is presented. Firstly, a market model of double auction is described, in which agents are utilized to represent the computational resource traders in the grid environment and are equipped with the reinforcement learning algorithm. Secondly, a double auction mechanism is presented, where the uniform-price auction is adopted aiming at CPU resources, and the transaction fee can be adjusted flexibly. Finally, the efficiency of the presented double auction mechanism is analyzed through experiments, and experimental results show that the presented mechanism is efficient, and the transaction price varies mildly.

Recent advances in CFD grid application platform

The computational fluid dynamics (CFD) grid application platform provides a grid environment for CFD applications using high performance computing. It adopts service oriented architecture (SOA), is based on IBMs Service Domain, extends and customizes it for CFD applications in several modules, such as service requesting, job scheduling, job management, failure recovery, etc. By defining general CFD application interfaces such as data format, the platform integrates different CFD applications, including mesh generation, domain decomposition and resolvers, to follow the workflow customized by end-users to finish a complete CFD job. Furthermore, CFD application development specifications and packages are provided to facilitate migrating most sequential and parallel CFD applications to the platform. Currently, a prototype system is available online to the public for testing.

A Research on the Framework of Grid Manufacturing

This paper presents firstly in the world the framework of Grid manufacturing, which neatly combines Grid technology with the infrastructure of advanced manufacturing technology. It studies the Grid-oriented knowledge description and acquisition, and constructs the distributed Knowledge Grid model. It also deals with the protocol of node description in collaborative design, and builds up the distributed collaborative design model. And the research on the protocol and technology of node constructing leads to the collaborative production model of Grid manufacturing.

Stable group model in mobile peer-to-peer media streaming system

We study two key problems arising from mobile peer-to-peer media streaming: the stability of interconnection between supplying peers and requesting peers in the mobile peer-to-peer streaming system; and fast capacity amplification of the entire mobile peer-to-peer streaming system. Many algorithms for the fast capacity amplification of the peer-to-peer streaming system have been proposed. However, these algorithms are inefficient in the mobile ad-hoc networks. Topological dynamics of mobile peer-to-peer are exacerbated by the changes of mobile users location and interest. We observe that the mobile users exhibit correlated mobility patterns in practical ad-hoc networks. We use the stable group algorithm to characterize user mobility in mobile ad-hoc networks. Based on the stable group, we then propose a distributed stable-group differentiated admission control algorithm (SGDAC/sub p2p/), which leads to fast amplifying of the systems total streaming capacity using self-growing. Finally, extensive simulation results are presented to compare between the SGDAC/sub p2p/ and traditional methods to prove the superiority of the algorithm.

A Distributed Approach for Resource Pricing in Grid Environments

A distributed group-pricing algorithm is presented for the market-based resource management in the grid context based on quick convergence of centralized algorithms and scalability of distributed algorithms. According to the new algorithm, resources in the system are divided into multiple resource groups according to the degree of price correlation of resources. When the demand and supply of resources in the system changes, each auctioneer in the defined system structure is responsible for adjusting simultaneously the price of one resource group respectively until the excess demand of all resources becomes zero. We test the distributed group-pricing algorithm against the existed distributed algorithm, and analyze the property of the algorithm. Experimental results indicate that an equilibrium can be achieved by the distributed group-pricing algorithm quicker than by the existed distributed algorithm.

VIP: a P2P communication platform for NAT traversal

Nowadays, the Internet architecture is complicated and IP addresses are limited in IPV4 context. Many users located behind different kinds of NATs or Firewalls can hardly get a public unique IP. So the hosts behind the NAT can not be accessed by the hosts behind the other NATs. Some P2P systems can partially solve such kind of problems, but unfortunately, these systems just focus the specific self-contained applications such as Skype and BitTorrent whose P2P architectures and NAT traversal mechanisms can not be re-used by other applications directly. In this paper we present a solution by setting up a Virtual Intranet Platform (VIP) which use the public DHT service -OpenDHT as the distributed address/port information rendezvous. Without changing the configuration of the NAT, all the network and distributed application service behind the NAT can make use of the VIP to communicate with the corresponding peer services outside the NAT. The performance of the bandwidth, data lost and delay problems are much better than the existing traditional C-S framework platforms, more general than specific P2P applications. The P2P Communication Platform for NAT Traversal-VIP, is robust and scalable because there are no single failure points in the platform, the structure is in distributed, and majority of the traffic data between two hosts behind the NAT can be transfer directly without relaying.

Coordinating Business Transaction for Grid Service

Grid service is next-generation computing platform. Transaction for Grid service is one of the key technologies. In heterogeneous, dynamical and autonomous Grid environment, however, traditional transaction technologies is unsuitable. And little attention has been paid to support transaction coordination for Grid service. In this paper, we propose a transaction framework that can coordinate atomic and cohesion transaction and recover system from various exceptions. The atomic transaction ensures the ACID properties while the cohesion transaction relaxes the atomicity and isolation properties. By generating and executing compensation transaction automatically, the framework can satisfy the requirements of business transactions for Grid service environment.