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| 1 | Modeling Delay and Packet Drop in Networked Control Systems Using Network Simulator NS2显示文摘Wireless Networked Control Systems (WNCS) are used to implement a control mechanism over a wireless network that is capable of carrying real-time traffic. This field has drawn enormous attention from current researchers because of its flexibility and robustness. However, designing efficient WNCS over Mobile Ad Hoc Networks (MANET) is still a challenging topic because of its less-predictable aspects, such as inconsistent delay, packet drop probability, and dynamic topology. This paper presents design guidelines for WNCS over MANET using the Network Simulator version 2, NS2 software. It investigates the impact of packet delay and packet drop under the AODV and DSR routing protocols. The simulation results have been compared to MATLAB results for validation. | Mohammad Shahidul Hasan Christopher Harding Alison Griffiths | 2005 | International Journal of Automation and computing2005，2，2： | 9 |
| 2 | The application of the QSSA via reaction lumping for the reduction of complex hydrocarbon oxidation mechanisms显示文摘 | Kevin J. Hughes Mike Fairweather John F. Griffiths Richard Porter Alison S. Tomlin | 2009 | Proceedings of the Combustion Institute2009，，1： | 2 |
| 3 | Capacitor Voltage Balancing Strategy Based on Sub-module Capacitor Voltage Estimation for Modular Multilevel Converters显示文摘The modular multilevel converter(MMC)is expected to be used extensively in high-voltage direct current(HVDC)transmission networks because of its superior characteristics over the line-commutated converter(LCC).A key issue of concern is balancing sub-module capacitor voltages in the MMCs,which is critical for the correct operation of these converters.The majority of voltage balancing techniques proposed thus far require that the measurement of the capacitor voltages use a reliable measuring system.This can increase the capital cost of the converters.This paper presents a voltage balancing strategy based on capacitor voltage estimation using the adaptive linear neuron(ADALINE)algorithm.The proposed estimation unit requires only three voltage sensors per phase for the arm reactors and the output phase voltages.Measurements of sub-module capacitor voltages and associated communication links with the central controller are not needed.The proposed strategy can be applied to MMC systems that contain a large number of sub-modules.The method uses PSCAD/EMTDC,with particular focus on dynamic performance under a variety of operating conditions. | Mahmoud Abdelsalam Mostafa Marei Sarath Tennakoon Alison Griffiths | 2016 | CSEE Journal of Power and Energy Systems2016，2，1： | 2 |
| 4 | Development and Verification of Simulation Model Based on Real MANET Experiments for Transport Layer Protocols (UDP and TCP)显示文摘There is a lack of appropriate guidelines for realistic user traces, mobility models, routing protocols, considerations of real-life challenges, etc. for general-purpose mobile ad hoc networks (MANET). In this paper, four laptops are used in an open field environment in four scenarios to evaluate the performances of Internet control message protocol (ICMP) based ping and transmission control protocol (TCP) based streaming video applications using optimised link state routing (OLSR) implementation in an IEEE 802.11g wireless network. Corresponding simulations are developed in Network Simulator ns-2 by setting simulation parameters according to the real experiments. Difficulties faced to regenerate real-life scenarios have been discussed and the gaps between reality and simulation are identified. A setup guideline to produce realistic simulation results has been established. | Joarder Mohammad Mustafa Kamal Mohammad Shahidul Hasan Alison L. Griffiths Hongnian Yu | 2013 | International Journal of Automation and computing2013，10，1： | 2 |
| 5 | A Comparison of Mamdani and Sugeno Fuzzy Based Packet Scheduler for MANET with a Realistic Wireless Propagation Model显示文摘The mobile nature of the nodes in a wireless mobile ad-hoc network(MANET) and the error prone link connectivity between nodes pose many challenges. These include frequent route changes, high packet loss, etc. Such problems increase the end-toend delay and decrease the throughput. This paper proposes two adaptive priority packet scheduling algorithms for MANET based on Mamdani and Sugeno fuzzy inference system. The fuzzy systems consist of three input variables: data rate, signal-to-noise ratio(SNR) and queue size. The fuzzy decision system has been optimised to improve its efficiency. Both fuzzy systems were verified using the Matlab fuzzy toolbox and the performance of both algorithms were evaluated using the riverbed modeler(formally known as OPNET modeler). The results were compared to an existing fuzzy scheduler under various network loads, for constant-bit-rate(CBR) and variable-bit-rate(VBR) traffic. The measuring metrics which form the basis for performance evaluation are end-to-end delay, throughput and packet delivery ratio. The proposed Mamdani and Sugeno scheduler perform better than the existing scheduler for CBR traffic. The end-to-end delay for Mamdani and Sugeno scheduler was reduced by an average of 52 % and 54 %, respectively.The performance of the throughput and packet delivery ratio for CBR traffic are very similar to the existing scheduler because of the characteristic of the traffic. The network was also at full capacity. The proposed schedulers also showed a better performance for VBR traffic. The end-to-end delay was reduced by an average of 38 % and 52 %, respectively. Both the throughput and packet delivery ratio(PDR) increased by an average of 53 % and 47 %, respectively. The Mamdani scheduler is more computationally complex than the Sugeno scheduler, even though they both showed similar network performance. Thus, the Sugeno scheduler is more suitable for real-time applications. | Oche Alexander Egaji Alison Griffiths Mohammad S.Hasan Hong-Nian Yu | 2015 | International Journal of Automation and computing2015，12，1： | 1 |
| 6 | Inherited disorders of iron storage and transport显示文摘 | William JH Griffiths Alison L | 1999 | Molecular Med Today1999，5，： | 1 |
| 7 | Structured biopolymer-based delivery systems for encapsulation, protection, and release of lipophilic compounds显示文摘 | Alison Matalanis Owen Griffith Jones David Julian McClements | 2011 | Food Hydrocolloids2011，，8： | 1 |
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