Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Phil Holifield is active.

Publication


Featured researches published by Phil Holifield.


Broadband Networks: Strategies and Technologies | 1995

Modeling and performance evaluation of a modified Orwell protocol under symmetrical and asymmetrical traffic distributions

Phil Holifield; Trevor J. Terrell; Philip Mars

With the emergence of Broadband ISDN and the adoption of ATM as its transport mechanism there is a growing interest in slotted ring networks both for high speed packet switching and for multimedia LAN applications. This paper describes a slotted ring testbed which uses a modified Orwell protocol for media access, and which has enabled a study of the modified Orwell protocol under symmetrical and asymmetrical traffic flow distributions. The architecture of the slotted ring testbed is outlined, and analytical models for the protocol are presented for different traffic flow distributions. The analytical results are compared to experimental results obtained from the testbed. The suitability of the reset rate as an indicator of available bandwidth in an access control mechanism is considered, and it is shown that for constant traffic flow and traffic statistics the reset rate works well as an indicator of potential network congestion. Under changing traffic distributions and traffic arrival statistics, additional indicators of congestion are required. On-going work into access control for the test-bed in a integrated services environment is outlined.


Research in Learning Technology | 2004

Implementation of Computer Assisted Assessment: Lessons from the Literature

Gavin Sim; Phil Holifield; Martin Brown


Archive | 2004

Piloting CAA: All Aboard

Gavin Sim; Phil Holifield


EdMedia: World Conference on Educational Media and Technology | 2004

Computer Assisted Assessment: All those in favour tick here.

Gavin Sim; Phil Holifield


Archive | 2008

Heuristics for evaluating the usability of CAA applications

Gavin Sim; Janet C. Read; Phil Holifield


EdMedia: World Conference on Educational Media and Technology | 2006

Using Heuristics to Evaluate a Computer Assisted Assessment Environment

Gavin Sim; Janet C. Read; Phil Holifield


EdMedia: World Conference on Educational Media and Technology | 2007

Heuristic Evaluations of Computer Assisted Assessment Environments

Gavin Sim; Janet C. Read; Phil Holifield; Martin Brown


Archive | 2006

Evaluating the user experience in CAA environments: what affects user satisfaction?

Gavin Sim; Janet C. Read; Phil Holifield


Archive | 2005

The design of multimedia assessment objects.

Gavin Sim; Stephanie Strong; Phil Holifield


EdMedia: World Conference on Educational Media and Technology | 2005

Tracker: A tool to improve student retention

Phil Holifield; Guy Heatley

Collaboration


Dive into the Phil Holifield's collaboration.

Top Co-Authors

Avatar

Gavin Sim

University of Central Lancashire

View shared research outputs
Top Co-Authors

Avatar

Janet C. Read

University of Central Lancashire

View shared research outputs
Top Co-Authors

Avatar

Guy Heatley

University of Central Lancashire

View shared research outputs
Top Co-Authors

Avatar

Martin Brown

University of Central Lancashire

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Jim Ingham

University of Central Lancashire

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Trevor J. Terrell

University of Central Lancashire

View shared research outputs
Researchain Logo
Decentralizing Knowledge