School of Computer Science and Informatics
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Item Open Access Analysing the Moodle e-learning platform through subgroup discovery algorithms based on evolutionary fuzzy systems(DMU, 2012-09-01) Carmona, C. J.; Elizondo, DavidNowadays, there is a increasing in the use of learning management systems from the universities. This type of systems are also known under other di erent terms as course management systems or learning content management systems. Speci cally, these systems are e-learning platforms o ering di erent facilities for information sharing and communication between the participants in the e-learning process. This contribution presents an experimental study with several subgroup discovery algorithms based on evolutionary fuzzy systems using data from a web-based education system. The main objective of this contribution is to extract unusual subgroups to describe possible relationships between the use of the e-learning platform and marks obtained by the students. The results obtained by the best performing algorithm, NMEEF-SD, are also presented. The most representative results obtained by this algorithm are summarised in order to obtain knowledge that can allow teachers to take actions to improve student performance.Item Open Access Benchmark Functions for the CEC'2017 Competition on Many-Objective Optimization(University of Birmingham, U.K., 2017-01) Cheng, Ran; Li, Miqing; Tian, Ye; Zhang, Xingyi; Yang, Shengxiang; Jin, Yaochu; Yao, XinIn the real world, it is not uncommon to face an optimization problem with more than three objectives. Such problems, called many-objective optimization problems (MaOPs), pose great challenges to the area of evolutionary computation. The failure of conventional Pareto-based multi-objective evolutionary algorithms in dealing with MaOPs motivates various new approaches. However, in contrast to the rapid development of algorithm design, performance investigation and comparison of algorithms have received little attention. Several test problem suites which were designed for multi-objective optimization have still been dominantly used in many-objective optimization. In this competition, we carefully selects/designs 15 test problems with diverse properties, aiming to promote the research of evolutionary many-objective optimization (EMaO) via suggesting a set of test problems with a good representation of various real-world scenarios. Also, an open-source software platform with a user-friendly GUI is provided to facilitate the experimental execution and data observation.Item Open Access Benchmark Functions for the CEC'2018 Competition on Dynamic Multiobjective Optimization(Newcastle University, 2018-01) Jiang, Shouyong; Yang, Shengxiang; Yao, Xin; Tan, Kay Chen; Kaiser, Marcus; Krasnogor, NatalioItem Open Access Benchmark Functions for the CEC'2018 Competition on Many-Objective Optimization(2018-01) Cheng, Ran; Li, Miqing; Tian, Ye; Xiang, Xiaoshu; Zhang, Xingyi; Yang, Shengxiang; Jin, Yaochu; Yao, XinItem Open Access Benchmark generator for CEC 2009 competition on dynamic optimization(University of Leicester, U.K., 2008-10) Li, Changhe; Yang, Shengxiang; Nguyen, T. T.; Ling Yu, E.; Yao, Xin; Jin, Yaochu; Beyer, H. -G.; Suganthan, P. N.Item Open Access Benchmark Generator for the IEEE WCCI-2012 Competition on Evolutionary Computation for Dynamic Optimization Problems(Brunel University, U.K., 2011-10) Li, Changhe; Yang, Shengxiang; Pelta, David A.Based on our previous benchmark generator for the IEEE CEC’09 Competition on Dynamic Optimization, this report updates the two benchmark instances where a new change type has been developed as well as a constraint to the benchmark instance of the dynamic rotation peak benchmark generator.Item Metadata only Benchmark generator for the IEEE WCCI-2012 competition on evolutionary computation for dynamic optimization problems. Technical Report 2011.(Department of Information Systems and Computing, Brunel University., 2011) Li, Changhe; Yang, Shengxiang; Pelta, David A.Item Open Access Benchmark Generator for the IEEE WCCI-2014 Competition on Evolutionary Computation for Dynamic Optimization Problems: Dynamic Rotation Peak Benchmark Generator (DRPBG) and Dynamic Composition Benchmark Generator (DCBG)(De Montfort University, UK, 2013-10) Li, Changhe; Mavrovouniotis, Michalis; Yang, Shengxiang; Yao, XinBased on our previous benchmark generator for the IEEE CEC’12 Competition on Dynamic Optimization, this report updates the two benchmark instances where two new features have 1been developed as well as a constraint to the benchmark instance of the dynamic rotation peak benchmark generator. The source code in C++ language for the two benchmark instances is included in the library of EAlib, which is an open platform to test and compare the performances of EAs.Item Open Access Benchmark Generator for the IEEE WCCI-2014 Competition on Evolutionary Computation for Dynamic Optimization Problems: Dynamic Travelling Salesman Problem Benchmark Generator(De Montfort University, U.K., 2013-10) Mavrovouniotis, Michalis; Li, Changhe; Yang, Shengxiang; Yao, XinIn this report, the dynamic benchmark generator for permutation-encoded problems for the travelling salesman problem (DBGPTSP) proposed in is used to convert any static travelling salesman problem benchmark to a dynamic optimization problem, by modifying the encoding of the instance instead of the fitness landscape.Item Open Access Common Criteria Protection Profile for Secure Communication Module for Water Tracking System(Common Criteria Portal, 2015-10-15) Bingol, Muhammed Ali; Kocabas, Unal; Kardas, SuleymanThe Target of Evaluation (TOE) as defined in this Protection Profile is the Secure Communication Module for Water Tracking System (WTS). The TOE collects information from input devices such as pH sensor, conductivity sensor, temperature sensor, flow meter, RFID / 2D barcode reader, etc., and then it sends these collected data to the Data Management Center (DMC). In this section, first the overall Water Tracking System is introduced. Then, details of Secure Communication Module (TOE) are given. Afterwards the components of TOE, the cryptographic operations performed by TOE and the capabilities of TOE are introduced.Item Metadata only Deriving Real-Time Programs from Duration Calculus Specifications(Technical Report 222, UNU/IIST, P.O. Box 3058, 2000) Siewe, Francois; Van Hung, DangIn this paper we present a syntactical approach for deriving real-time programs from a formal specification of the requirements of real-time systems. The main idea of our approach is to model discretization at state level by introducing the discrete states approximating the continuous ones, and then derive a specification of the control program over discrete states. Then the control program is derived from its specification using an extension of Hoare triples to real-time.Item Open Access Experimental evaluation of algorithmic solutions for the maximum generalised network flow problem(2001-12) Radzik, Tomasz; Yang, ShengxiangThe maximum generalised network flow problem is to maximise the net flow into a specified node in a network with capacities and gain-loss factors associated with edges. In practice, input instances of this problem are usually solved using general-purpose linear programming codes, but this may change because a number of specialised combinatorial generalised-flow algorithms have been recently proposed. To complement the known theoretical analyses of these algorithms, we develop their implementations and investigate their actual performance. We focus in this study on Goldfarb, Jin and Orlin's excess-scaling algorithm and Tardos and Wayne's push-relabel algorithm. We develop variants of these algorithms to improve their practical efficiency. We compare the performance of our implementations with implementations of simple, but non-polynomial, combinatorial algorithms proposed by Onaga and Truemper, and with performance of CPLEX, a commercial general-purpose linear programming package.Item Open Access Fuzzy Photo Project(2011-09-28) Greenfield, SarahItem Metadata only GaAs FETs at Frequencies above 20GHz(Plessey, 1982-10) Oxley, C. H.; Forrest, P.; Bennett, R. H.Item Open Access Guidelines for Responsible Research and Innovation(De Montfort University, 2016) Wilford, S.; Fisk, Malcolm; Stahl, Bernd Carsten, 1968-Guidelines for Responsible Research and InnovationItem Open Access A new genetic algorithm based on primal-dual chromosomes for royal road functions(2001-09) Yang, ShengxiangGenetic algorithms (GAs) have been broadly studied by a huge amount of researchers and there have been many variations developed based on Holland's simple genetic algorithm (SGA). Inspired by the phenomenon of diploid genotype and dominance mechanism that broadly exist in nature, in this paper we propose a new genetic algorithm - primal-dual genetic algorithm (PDGA). PDGA operates on a pair of chromosomes that are primal-dual to each other through the primal-dual mapping, which works in the sense of Hamming distance in genotype. The primal-dual mapping improves the exploration capacity of PDGA and thus its searching efficiency in the search space. We compare the performance of PDGA over SGA based on the Royal Road functions, which are especially designed for testing GA's performance. The experiment results show that PDGA outperforms SGA for different performance measures.Item Open Access Practical applications of Quantum measurement techniques in pharmaceuticals and biologic activities(N/A, 2018) Orun, A.This report is mainly supported by the experiments done by utilizing a basic level quantum interferometer (Mach-Zehnder) in our electro-optics lab, based on quantum physical principles so that a laser light at 532nm wavelength (simulating single photons) is emitted into the interferometer and the light beam is splitted by two paths by interferometer optics then join together at the end producing an interference pattern (wave property). The pattern is stimulated by interaction between the interferometer’s lower or upper arm and a substance under investigation (e.g. chamber with gas, liquid, etc.) or a different medium whose refraction index differs from normal condition. Pattern is also modified by dislocation of interferometer’s components like its mirror or lens by a microscopic pressure on it.Item Metadata only A Practical Guide to Improving Lighting in Existing Homes(Thomas Pocklington Trust, 2015) Fisk, Malcolm; Raynham, P.Better lighting at home can make a dramatic difference to people’s lives. This Good Practice Guide explains how to improve lighting to meet the needs of people with sight loss. It is useful to anyone supporting others to live independently in their own homes, such as housing and support staff, home improvement agencies, rehabilitation workers for people with visual impairment (ROVIs) and occupational therapists (OTs).Item Open Access Regulation of digital platforms for a socially-just gig economy in Kenya(HIIG Impact Publication Series, 2023-04-27) Kwanya, T.; Wakunuma, KutomaDigital platforms are fundamentally changing the world of work, giving way to a new economic model referred to as the ‘gig economy’. Kenya is at the forefront of this gig economy, with a wide range of digital platforms operating and offering workers immense opportunities for flexible, cost-effective and convenient work. On the flipside the precarious livelihoods of workers often remain unaddressed. This study sheds light on challenges gig workers face in Kenya such as platform’s market power concentration, a lack of codified worker’s rights or women facing disadvantages on the job market due to gender-based factors. Furthermore, it gives concrete recommendations that policy makers can draw on to refine a digital platform regulation approach for a more socially-just gig economy in Kenya and other sub-Saharan countries.Item Metadata only Social responsibility in the information age(© De Montfort University, 2000) Rogerson, Simon; Fairweather, N. Ben, 1966-As an organisation which recognises the key role of technology in achieving our goals, The Post Office welcomes the opportunity to become involved with the Advances in Social Responsibility in the Information Age series of seminars. Our participation has led to a greater understanding of the issues and has also enabled us to provide insight into some of the practical challenges involved in addressing such issues in corporate life. This report forms a key part of the ongoing research into the social and ethical implications of the use of technology. The results of this research will support organisations in their drive to understand these implications and the impact they have on customers, employees and the wider community.