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RESEARCH AREAS

Computational Intelligence Databases and Information Management Networking and Systems Pattern Recognition and Machine Learning

Networking and Systems

Networking and Systems focuses on research and development of major networking topics, including but not limited to wireless networks, mobile location estimation, ubiquitous computing, Internet systems, communication services, peer-to-peer networks, optical networks and high-performance computing etc.


Faculty Involved:


Funded Research and Consultancy Projects in the Past Few Years:

A General Approach for Fast Extraction of Low-level Disk Characteristics
Staff Dr. CHU, Xiao Wen (Principal Investigator)
URL http://www.comp.hkbu.edu.hk/~chxw/projects.html
Abstract The performance gap between magnetic disks and RAM is steadily increasing. In order to bridge this gap, it is valuable to obtain and exploit accurate information about the low-level disk characteristics so as to optimize the system performance. In this project, we investigate the low-level disk characteristics and develop tools that can efficiently extract variant low-level disk characteristics.

A Microeconomic Approach for Digital Rights Management in P2P Networks
Staff Dr. CHU, Xiao Wen (Principal Investigator)
URL http://www.comp.hkbu.edu.hk/~chxw/projects.html
Abstract Peer-to-peer (P2P) networks are self-organizing distributed systems, with no centralized authority or infrastructure. In this project, we propose novel approaches to both new and existing problems, and unify them into one integrated approach for enhancing the copyright protection in P2P networks and thwarting selfish behaviors.

Efficient Resource Management in Reliable Wavelength-Routed WDM Networks
Staff Dr. CHU, Xiao Wen (Principal Investigator)
URL http://www.comp.hkbu.edu.hk/~chxw/projects.html
Abstract Optical networks based on wavelength-division multiplexing (WDM) are growing at unprecedented rates to accommodate the ever-increasing demand for bandwidth. The objective of this project is to develop an efficient resource management scheme for reliable wavelength-routed WDM networks. This includes an advanced routing and wavelength assignment (RWA) algorithm with restoration capability, and also an effective wavelength converter allocation scheme.

Explore Business Models for Streaming Applications in Peer-to-Peer Environments
Staff Dr. CHU, Xiao Wen (Co-Investigator of External Project)
URL http://www.comp.hkbu.edu.hk/~chxw/projects.html
Abstract Peer-to-peer (P2P) file-sharing systems have already become one of the most efficient tools for individuals to exchange digital information goods over Internet. The project involves in designing incentive mechanisms, investigating possible business models and pricing schemes that work for P2P streaming applications. These issues are all critical for the success of P2P streaming applications.

Lightpath Rerouting in Wavelength-Routed WDM Networks
Staff Dr. CHU, Xiao Wen (Principal Investigator)
URL http://www.comp.hkbu.edu.hk/~chxw/projects.html
Abstract WDM technology has been widely deployed in optical backbone networks to accommodate the ever-increasing bandwidth demand. This project aims at decreasing the blocking probability by lightpath rerouting. The first step is to thoroughly investigate the design of intentional lightpath rerouting algorithms, and the second step is to investigate the effect of integrating passive lightpath rerouting and intentional lightpath rerouting.

Performance Evaluation of IEEE 802.11 Based Wireless LAN with Internal UDP Traffic
Staff Dr. CHU, Xiao Wen (Principal Investigator)
URL http://www.comp.hkbu.edu.hk/~chxw/projects.html
Abstract IEEE 802.11 based Wireless LANs have become ubiquitous. The objective of this research project is to design systematic and reproducible experiments to show that, with uncontrolled UDP traffic in the network, the AP will become the system bottleneck and the system goodput could drop to an unacceptable level, mainly due to buffer overflow at the AP.

Using Fuzzy Control Approach to Provide QoS Guarantees in Web Servers
Staff Dr. CHU, Xiao Wen (Principal Investigator)
URL http://www.comp.hkbu.edu.hk/~chxw/projects.html
Abstract With the wide spread usage of web applications, the number of accesses to a website is ever increasing. This project aims to address the delay performance problem in two web server architectures: the single-tier architecture and the cluster architecture. We shall investigate ways to manage the resources of the web servers to provide the performance guarantee for premium class users.

Privacy and Security for Advanced Information Systems and Applications
Staff Dr. HU, Haibo (Principal Investigator)
URL http://www.comp.hkbu.edu.hk/~haibo/projects.htm
Abstract Privacy and security are two critical concerns in modern advanced information systems, such as mobile information systems and social networking services. This project studies query processing with mutual privacy protection. In outsourced databases, the protection of both data privacy and query privacy are equally important. We design both secure multiparty computation and privacy homomorphism-based techniques for efficient query processing.

Maximizing Lifetime of Sensor-Target Surveillance in Wireless Sensor Networks
Staff Dr. LIU, Hai (Principal Investigator)
URL http://www.comp.hkbu.edu.hk/~hliu/
Abstract The proposed research studies the maximal lifetime problem in sensor-target surveillance networks. We will design an optimal schedule for sensor-target surveillance. We will further investigate the dynamic schedule if sensors fail before energy depletion due to unexpected reasons. Finally, we will develop an integrated solution.

Minimum Latency of Aggregation and Gathering in Multihop Wireless Networks with Multiple Radios and Multiple Channels
Staff Dr. LIU, Hai (Principal Investigator)
URL http://www.comp.hkbu.edu.hk/~hliu/
Abstract Advance of technologies makes it feasible to equip a wireless node with multiple radios which operate on multiple channels. This research aims to conduct algorithmic studies of minimizing the communication latency by utilizing multiple radios and channels. We focus on the communication schedules for broadcasting, gathering, aggregation and beaconing, under both the protocol interference model and the SINR model.

Movement Control Algorithm for Bi-Connectivity in Robotic Sensor Networks
Staff Dr. LIU, Hai (Principal Investigator)
URL http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=05555924
Abstract Robots autonomously move to the desired locations based on only 1-hop information, such that the initial and possibly disconnected network is self-organized into a bi-connected network. The objective is to maximize the coverage of the network while minimizing the moving distance of the robots.

QoS-Concerned Rendezvous in Cognitive Radio Networks
Staff Dr. LIU, Hai (Principal Investigator)
URL http://www.comp.hkbu.edu.hk/~hliu/
Abstract Rendezvous is a fundamental operation of Cognitive radio network (CRN) in which two or more users meet and establish a communication link on a commonly-available channel, so that consequent information exchange and data communication can be carried on. This research aims at designing rendezvous algorithms for rendezvous on the high-quality channel in finite time.

Rendezvous Algorithm for Cognitive Radio Networks
Staff Dr. LIU, Hai (Principal Investigator)
URL http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5935066&tag=1
Abstract Design algorithms for blind rendezvous (rendezvous without using any centralized controller and common control channel), such that users can simultaneously hop on a commonly-available channel and thus the rendezvous is achieved.

Sensor Placement and Scheduling to Maximize the Lifetime of Wireless Sensor Networks
Staff Dr. LIU, Hai (Principal Investigator)
URL http://www.comp.hkbu.edu.hk/~hliu/
Abstract In sensor-target surveillance networks, sensors are placed to watch targets, collect information and forward the data to the base station (BS). The proposed research studies the maximal lifetime problem which is to place and schedule sensors to watch targets in turn, and find routes to pass data to the BS, such that the lifetime of the network is maximized.

Assignment of Movies to Heterogeneous Video Server
Staff Prof. LEUNG, Yiu Wing (Supervisor of PhD Student Mr. HOU, Yuen Tan Ricky)
URL http://www.comp.hkbu.edu.hk/v1/proj/82/
Abstract As a VOD system is being used and evolved, its servers probably become heterogeneous. We formulate the problem of assigning movies to heterogeneous servers for minimal blocking probability, prove its NP-hardness, and propose to use problem relaxation and goal to get close-to-optimal assignment.

Logical Subnetting for Constructing All-Optical Multi-Fiber Networks
Staff Prof. LEUNG, Yiu Wing (Supervisor of PhD Student Mr. CHAN, Kam Chau Tony)
URL http://www.comp.hkbu.edu.hk/v1/proj/81/
Abstract All-optical multi-fiber networks require large and expensive optical switches. To tackle this problem, the existing approach adopts an individual node perspective and focuses on designing the internal node architectures that require smaller optical switches. In this PhD project, we advocate to take an entire network perspective and propose a logical subnetting approach to further reduce the switch size required.

A Research Centre for Ubiquitous Computing
Staff Prof. NG, Joseph Kee Yin (Principal Investigator)
URL http://www.comp.hkbu.edu.hk/~RCUC/
Abstract The objectives of this Research Center are: to coordinate research activities & to excel in some focused areas related to ubiquitous computing; to construct test-beds for testing & benchmarking; and to develop software for ubiquitous applications. The Center will play a leading role in technology transfer and the commercialization of research results to products and services to the consumers.

Data-Centric Filter Management and Routing Optimization for Distributed Monitoring Systems
Staff Prof. XU, Jian Liang (Principal Investigator)
URL http://www.comp.hkbu.edu.hk/~xujl/research/defacto.html
Abstract This research project proposes to take data-centric designs to improve performance for distributed monitoring systems. Two issues namely filter management for approximate monitoring and routing optimization for in-network data aggregation are studied under this project.

Energy-Conserving Quality-Aware Data Collection in Wireless Sensor Networks
Staff Prof. XU, Jian Liang (Principal Investigator)
URL http://www.comp.hkbu.edu.hk/~xujl/research/ecoquad.html
Abstract Energy efficiency is a critical consideration in the design of a wireless sensor network. This project exploits the trade-off between data quality and communication cost to improve energy efficiency in sensor data collection.

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Department of Computer Science, Hong Kong Baptist University
Hong Kong Baptist University