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Browse Journal: IST Transactions of Systems, Cybernetics-Theory and Applications

Year: Issue Number:

Paper No Title Abstract
04-10-001 Particle Swarm Optimisation Algorithms and Their Application to Controller Design for Flexible Structure Systems Show Abstract PDF
  M.O. Tokhi and M.S. Alam
Particle swarm optimisation (PSO) is one of the relatively new optimisation techniques, which has become increasingly popular in tuning and designing controllers for different applications. A major problem is that simple PSO have a tendency to converge to local optima, mainly, due to lack of diversity in the particles as the algorithm proceeds and improper selection of other parameters. Maintaining diversity within a population is challenging for PSO, especially for dynamic problems. In order to increase diversity in the search space and to improve convergence, a new variant of PSO is proposed. The increased interest from industry and real-world applications has led to several modifications in the conventional algorithms so as to deal with multiple conflicting objectives and constraints. A modified multi-objective PSO (MOPSO) proposal is made which will allow the algorithm to deal with multi-objective optimisation problems. The main challenge, in designing a MOPSO algorithm, is to select local and global best for each particle so as to obtain a wide range of solutions that trade-off among the conflicting objectives. In the proposed algorithm, a new technique is introduced that combines external archive and non-dominated fronts of the current population in order to select the global best for each particle. The effectiveness of the proposed algorithm is assessed with two examples in controller design for vibration control of flexible structure systems and satisfactory results have been obtained.
04-10-002 Lumped Parameter Radio Wave Propagation Model for Storm Drain Pipes Show Abstract PDF
  Ivan Howitt; Jumanah Khan, Safeer Khan
In this paper, we examine narrowband radio wave propagation characteristics of concrete storm drain pipes (SDPs) as wireless communication channels at 2.4-2.5 GHz and 5.2 GHz within the industrial, scientific and medical (ISM) band. Previous related work on radio frequency (RF) propagation in subterranean cavities was focused on railroad, auto, subway, mine and sewer tunnels having cross sections greater than 1.05 meters. Our findings are a novel contribution in this area as there has been no previous published research on RF propagation inside SDPs. In order to characterize RF propagation within the narrow SDPs, we propose a lumped parameter model (LPM), that takes into account the attenuation coefficient and the antenna coupling losses to predict received power at distance d within the SDP. We also conducted a measurement campaign at selected sites in Charlotte, North Carolina to measure path losses in SDPs of diameters as low as 0.30m. The attenuation coefficient and antenna coupling losses are predicted using linear regression and a data set of received power at distance d is formed using LPM for comparison with results obtained from measurement campaign. We find that empirical data is in close agreement with predicted results from the LPM. The requirement of further work that can enhance the agreement between the empirical data and the predicted values is also highlighted.
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