基于云计算的大学城校园云的研究

针对当前高校信息化建设及教学中存在的问题,提出一种基于云计算的大学城校园云的建设方案。该方案充分整合利用大学城内高校资源,促进高校间教学科研交流,同时提出的"云中厂"教学方案为高校的实践教学提出了一条新的思路。     

Going mobile [mobile-computing networks]

Discusses virtual versus physical process-migration strategies in modeling mobile-computing networks. Both VPM and PPM play useful and effective roles in the modeling and simulation of real-world, mobile-computing networks. While PPM is a more accurate model of reality, by its very nature, VPM helps realize the modeling of networks with large numbers of mobile entities on testbeds with a modest number of processors, although at greatly reduced performance. Utamaphethai and Ghosh [1998] reported a TVHS simulation with 45,000 entities representing autonomous vehicles on a network of 60+ SUN Sparc 10 workstations. In contrast, a PPM implementation would be difficult to realize due to the large number of processors required and it would be unacceptably slow due to the large numbers of connections and disconnections. PPM is unquestionably superior when the computational loads associated with the mobile entities are high. However, its performance suffers relative to VPM where the system demands intense data exchange between the mobile and stationary units. This study also underscores that, for scalability in performance, the algorithms underlying real-world mobile computing networks must be designed to reduce communication while increasing local computation     

Robosoccer [mobile robotics experiment]

This paper describes robosoccer, the latest experiment in robotics, and one that is growing in popularity on college campuses around the world. In robosoccer, two teams of boxy, wheeled robots face off against each other. A whistle blows and they spring into action, jostling for possession of a brightly colored golfball on a playing field the size ofa Ping-Pong table. Each team struggles to push the ball into the other team's goal located at the opposite end of the table. The author describes how the robots move fluidly and fluidly, constantly adjusting to the run of play in a surprisingly lifelike way     

Wireless control of a multihop mobile robot squad - [wireless communications in networked robotics]

Wireless controls offer attractive features including flexibility, self-organization, and dynamic networking, especially in mobile control scenarios. At the same time, wireless controls pose new design challenges because network and control performance affect each other. We focus our study on a wireless, mobile, multihop, robot-control scenario and compare the applicability of standard routing protocols and two network-aware control methods in realistic simulations. The scenario is demanding ? with high mobility causing link breaks ? and stresses the routing and control algorithms. The system is modeled and evaluated on a platform for integrated control and communication co-simulator. The performance of the algorithms is evaluated not only at the network layer, but also from the application viewpoint, in this case the mobile robot-control system.     

Software testing for wireless mobile computing

4G wireless networks make it increasingly difficult to develop and test application software for mobile terminals in comparison with 3G or earlier generations. These 4G networks incorporate wireless LAN technologies, and mobile terminals can access the services provided by LANs as well as global network services. Therefore, software running on mobile terminals may depend on not only its application logic but also on services within the LANs to which the terminals are connected. To construct correct software to run in mobile terminals for 4G wireless networks and wireless LANs, it must be tested in all the networks to which the terminal could be moved and be connected. This article presents a new approach, called flying emulator, to testing software designed to run on mobile terminals. Like existing approaches, the approach provides software-based emulators of its mobile terminals for software designed to run the terminals. It is unique because it constructs emulators as mobile agents that can travel between computers. These emulators can carry the target software to the networks to which the terminals are connected and allow it to access services provided by the networks in the same way as if it was moved with and executed on the terminals connected to the networks. This article describes the idea of the approach, its implementation, and our experience with a typical application.     

Software technology for wireless mobile computing

Some of the possibilities and requirements for mobile computing on wireless local area networks (LANs) are discussed from the systems software viewpoint. The design of the Student Electronic Notebook (SEN) is sketched to provide a partial catalog of problems in building a real system for wireless mobile computing. This project was initiated to investigate the potential of wireless mobile computing to reshape education. Some of the key directions for research in software technology for wireless, mobile computing are examined. Some of the authors' experience with wireless LANs is related     

Open-source media [mobile multimedia software]

Multimedia is opening up a vast new frontier for software companies, thanks to the rapid growth of broadband connections to desktop computers and ever more capable cell-phones and wireless PDAs. RealNetworks is about to find out if its open-source gambit is going to pay off, as the first wave of Helix-powered hardware reaches the market. So far, only a handful of such devices have been released, including the Sony Vega television in Japan and the palmOne Treo 650 smart phone in the United States. No doubt other software vendors are watching closely; an open-source model that compels all developers to assign copyright back to the "mother ship" could soon become the preferred way to nurture communities of developers.     

Following nature's example [neural network computing]

Neural network computing uses the structure of neurons in the brain as a model for parallel-processing computers. There are numerous models which differ in detail but share common features including: the training of networks; simple computational elements with large numbers of interconnections; interconnection strengths are real-valued analogue quantities; and the network forms internal representations capturing subtle correlations. The authors describe the recent advances, particularly in the UK     

Microsoft and the mobile [phone]

The author questions wether mobile phones avoid the fate of the PC or is 'Microsoft-isation' inevitable. Microsoft has handful of mobile phones on the market built around its Smartphone 2002 operating system (OS) including O2's XDA and Orange's SPV (both built by Taiwanese firm HTC), and it hopes to increase its presence through further handset deals. A smartphone is a cross between a PDA and mobile phone that you can use to connect to the Web, check e-mails, organise your appointments, link to your PC, edit spreadsheets and word-processor files, and download new applications and services.