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Interests: Communication & Networking (Wireless Communication Protocols, Intelligent Vehicles, Location-based Services), File Sharing and Broadcast Techniques in Mobile Ad Hoc Network, Video Streaming in High Mobility Networks, Evacuation Management in Urban Environment, Images Retrieval System and Multicast in Multimedia Applications, Backup System in Grid Environment. Statement: My research is focused on communications and networking issues in highly dynamic ad hoc networks. According to a Gartner Group (www.gartner.com) report in September 2008, the worldwide telecommunications market is on pace to reach $2 trillion in 2008. Gartner predicts that by 2012, the ratio of mobile to fixed connections will exceed 4-to-1. The North American mobile data market grew to 141.1 million connections in 2007, with a compound annual growth rate of 41.7 percent. It is believed that a large portion will be ad hoc and multi-hop connections, which will open many opportunities for Mobile Ad hoc NETwork (MANET) applications and Wireless Mesh Network (WMN) applications. A MANET is a self-organizing multi-hop wireless network where all nodes participate in the routing and data forwarding process. Such a network can be easily deployed in situations where no base station is available, and a network must be build spontaneously. A Wireless mash network (WMN) is collection of mesh clients and mesh nodes (routers), with mesh nodes forming the backbone of the network and providing connection to the Internet and other network. Their rapid deployment and ease of maintenance are suitable for on-demand network such as disaster recovery, homeland security, convention centers, hard-to-wire buildings and unfriendly terrains. MANETs and WMNs provide an infrastructure beneficial to many sectors of society. For instance, lessons from the way financial services broke down during the 09/11 terrorist attack suggested for greater dispersion in the nation’s communications networks so that any future attack on a single trading site would not stop the system. In applications such as battlefield communications, national crises, disaster recovery, and sensor deployment, a wired network is not available and ad hoc networks provide the only feasible means of communications and information access. Example of these networks include ad hoc and sensor networks, vehicular networks, peer-to-peer and overlay networks, social networks, mesh networks, and grid networks, which have been gaining popularity recently. One important problem with MANET is the routing protocol that needs to work well not just with a small network, but also sustain efficiency and scalability as the network gets expanded and the application transmits data in greater volume. In such an environment, mobility, channel error, and congestion are the main causes for packet loss. Due to mobility of mobile hosts, addressing frequent and unpredictable topology changes is fundamental to MANET research. My work has resulted in 16 conference and 3 journal papers. One of the papers led to the Best Paper Award in the 2008 International Conference on Communication Theory, Reliability, and Quality of Service. Another paper was recognized as a top paper at IEEE Symposium on Computer and Communication conference, and was later invited to appear in a special issue on mobility protocols of the Computer Communication Journal. In addition, one of joined project with Symantec results a patent for new backup grid technology and adopted our design as the corporate framework for their future-generation data backup products. |
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Research |
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Ph.D - All But Dissertation |
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Yaohua (Danny) Ho
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