research

Research

[alphabetical order]

A Mobile Data Management for Internet-based Mobile Ad Hoc Networks (IMANETs)

Internet-based mobile ad hoc network (IMANET) is an emerging technique that combines a wired network (e.g. Internet) and a mobile ad hoc network (MANET) for developing a ubiquitous communication infrastructure. To fulfill users' demand to access various kinds of information, however, an IMANET has several limitations such as limited accessibility to the wired Internet, insufficient wireless bandwidth, and longer message latency. In this research, we address the issues involved in information search and access in IMANETS.

An Energy-Efficient Mobile Ad Hoc Networks (MANETs)

In a typical wireless mobile ad hoc network (MANET) using a shared communication medium, every node receives or overhears every data transmission occurring in its vicinity. However, this does not hold when a power saving mechanism (PSM) such as the one specified in IEEE 802.11 is employed, where the packet advertisement period is separated from the actual data transmission period. When a node receives an advertised packet that is not destined to itself, it switches to a low-power state during the data transmission period, and thus, conserves power. However, since some MANET routing protocols such as Dynamic Source Routing (DSR) collect route information via overhearing, they would suffer if they are used with the IEEE 802.11 PSM. Allowing no overhearing may critically deteriorate the performance of the underlying routing protocol, while unconditional overhearing may offset the advantage of using the PSM. This research investigates a new communication mechanisms.

A Mobility Modeling: Spatial and Temporal Properties

It has been recently observed that many of the large complex networks follow a scale-free power-law distribution, in which the network growth is mostly observed at a few densely populated nodes, called hubs. Such scale-free networks are natural outgrowths of many real-world phenomena, and therefore, wireless networks are expected to follow the scale-free pattern. Most of the prior research in wireless/ mobile ad hoc networks assume random node mobility and thus the nodes are almost uniformly distributed in the network. Unfortunately such mobility models are not realistic since they fail to capture the scale-free property. In this research, we explore a mobility model for scale-free wireless networks (SFWNs) and investigate the topological characteristics such networks using this mobility model.

An Energy-Efficient Wireless Mesh Network Protocol

Dr. Yi Liu, Assistant Professor

Specific interests in component-oriented software development, software product lines, frameworks and patterns. And current research is BoxScript, and a component-oriented programming language.

Programming Language Design

Specific interests in component-oriented programming language design.

Artificial Intelligence

Specific interests in expert systems and machine learning.