All Outputs (39)

Into the wild: challenges and opportunities for field trial methods (2011)
Presentation / Conference Contribution
Brown, B., Reeves, S., & Sherwood, S. (2011). Into the wild: challenges and opportunities for field trial methods.

Field trials of experimental systems `in the wild' have developed into a standard method within HCI - testing new systems with groups of users in relatively unconstrained settings outside of the laboratory. In this paper we discuss methodological cha... Read More about Into the wild: challenges and opportunities for field trial methods.

Designing difficult office space allocation problem instances with mathematical programming (2011)
Presentation / Conference Contribution
Ulker, O., & Landa-Silva, D. (2011). Designing difficult office space allocation problem instances with mathematical programming.

Office space allocation (OSA) refers to the assignment of room space to a set of entities (people, machines, roles, etc.), with the goal of optimising the space utilisation while satisfying a set of additional constraints. In this paper, a mathematic... Read More about Designing difficult office space allocation problem instances with mathematical programming.

Comparing hybrid constructive heuristics for university course timetabling (2011)
Presentation / Conference Contribution
Landa-Silva, D., & Obit, J. H. (2011). Comparing hybrid constructive heuristics for university course timetabling.

This extended abstract outlines four hybrid heuristics to generate initial solutions to the University course timetabling problem. These hybrid approaches combine graph colouring heuristics and local search in different ways. Results of experiments u... Read More about Comparing hybrid constructive heuristics for university course timetabling.

A heuristic algorithm for nurse scheduling with balanced preference satisfaction (2011)
Presentation / Conference Contribution
Constantino, A. A., Landa-Silva, D., Luiz de Melo, E., & Romao, W. (2011). A heuristic algorithm for nurse scheduling with balanced preference satisfaction.

This paper tackles the nurse scheduling problem with balanced preference satisfaction which consists of generating an assignment of shifts to nurses over a given time horizon and ensuring that the satisfaction of nurses personal preferences for shift... Read More about A heuristic algorithm for nurse scheduling with balanced preference satisfaction.

On Euclid’s algorithm and elementary number theory (2011)
Journal Article
Backhouse, R., & Ferreira, J. F. (2011). On Euclid’s algorithm and elementary number theory. Science of Computer Programming, 76(3), https://doi.org/10.1016/j.scico.2010.05.006

Algorithms can be used to prove and to discover new theorems. This paper shows how algorithmic skills in general, and the notion of invariance in particular, can be used to derive many results from Euclid’s algorithm. We illustrate how to use the alg... Read More about On Euclid’s algorithm and elementary number theory.

Fast and robust appearance-based tracking (2011)
Presentation / Conference Contribution
Liwicki, S., Zafeiriou, S., Tzimiropoulos, G., & Pantic, M. (2011). Fast and robust appearance-based tracking.

We introduce a fast and robust subspace-based approach to appearance-based object tracking. The core of our approach is based on Fast Robust Correlation (FRC), a recently proposed technique for the robust estimation of large translational displacemen... Read More about Fast and robust appearance-based tracking.

Principal component analysis of image gradient orientations for face recognition (2011)
Presentation / Conference Contribution
Tzimiropoulos, G., Zafeiriou, S., & Pantic, M. (2011). Principal component analysis of image gradient orientations for face recognition.

We introduce the notion of Principal Component Analysis (PCA) of image gradient orientations. As image data is typically noisy, but noise is substantially different from Gaussian, traditional PCA of pixel intensities very often fails to estimate reli... Read More about Principal component analysis of image gradient orientations for face recognition.

Motif detection inspired by immune memory (2011)
Journal Article
Wilson, W., Birkin, P., & Aickelin, U. (2011). Motif detection inspired by immune memory. Journal of the Operational Research Society, 62, https://doi.org/10.1057/jors.2010.81

The search for patterns or motifs in data represents an area
of key interest to many researchers. In this paper we present the Motif Tracking Algorithm, a novel immune inspired pattern identification tool that is able to identify variable length unk... Read More about Motif detection inspired by immune memory.

Congestion aware forwarding in delay tolerant and social opportunistic networks (2011)
Presentation / Conference Contribution
Radenkovic, M., & Grundy, A. (2011). Congestion aware forwarding in delay tolerant and social opportunistic networks. In 2011 Eighth International Conference on Wireless On-Demand Network Systems and Services. https://doi.org/10.1109/WONS.2011.5720201

We propose an approach for opportunistic forwarding that supports optimization of multipoint high volume data flow transfer while maintaining high buffer availability and low delays. This paper explores a number of social, buffer and delay heuristics... Read More about Congestion aware forwarding in delay tolerant and social opportunistic networks.

Audiovisual classification of vocal outbursts in human conversation using long-short-term memory networks (2011)
Presentation / Conference Contribution
Eyben, F., Petridis, S., Schuller, B., Tzimiropoulos, G., Zafeiriou, S., & Pantic, M. (2011). Audiovisual classification of vocal outbursts in human conversation using long-short-term memory networks.

We investigate classification of non-linguistic vocalisations with a novel audiovisual approach and Long Short-Term Memory (LSTM) Recurrent Neural Networks as highly successful dynamic sequence classifiers. As database of evaluation serves this year'... Read More about Audiovisual classification of vocal outbursts in human conversation using long-short-term memory networks.

An adaptive evolutionary multi-objective approach based on simulated annealing (2011)
Journal Article
Li, H., & Landa-Silva, D. (2011). An adaptive evolutionary multi-objective approach based on simulated annealing. Evolutionary Computation, 19(4), https://doi.org/10.1162/EVCO_a_00038

A multi-objective optimization problem can be solved by decomposing it into one or more single objective subproblems in some multi-objective metaheuristic algorithms. Each subproblem corresponds to one weighted aggregation function. For example, MOEA... Read More about An adaptive evolutionary multi-objective approach based on simulated annealing.

Non-linear great deluge with reinforcement learning for university course timetabling (2011)
Book Chapter
Obit, J. H., Landa-Silva, D., Sevaux, M., & Ouelhadj, D. (2011). Non-linear great deluge with reinforcement learning for university course timetabling. In M. Caserta, & S. Voss (Eds.), Metaheuristics: intelligent decision making. Springer

This paper describes a non-linear great deluge hyper-heuristic incorporating a reinforcement learning mechanism for the selection of low-level heuristics and a non-linear great deluge acceptance criterion. The proposed hyper-heuristic deals with comp... Read More about Non-linear great deluge with reinforcement learning for university course timetabling.

Robust and efficient parametric face alignment (2011)
Presentation / Conference Contribution
Tzimiropoulos, G., Zafeiriou, S., & Pantic, M. (2011). Robust and efficient parametric face alignment.

We propose a correlation-based approach to parametric object alignment particularly suitable for face analysis applications which require efficiency and robustness against occlusions and illumination changes. Our algorithm registers two images by ite... Read More about Robust and efficient parametric face alignment.

Sparse representations of image gradient orientations for visual recognition and tracking (2011)
Presentation / Conference Contribution
Tzimiropoulos, G., Zafeiriou, S., & Pantic, M. (2011). Sparse representations of image gradient orientations for visual recognition and tracking.

Recent results [18] have shown that sparse linear representations of a query object with respect to an overcomplete basis formed by the entire gallery of objects of interest can result in powerful image-based object recognition schemes. In this paper... Read More about Sparse representations of image gradient orientations for visual recognition and tracking.

Subspace analysis of arbitrarily many linear filter responses with an application to face tracking (2011)
Presentation / Conference Contribution
Zafeiriou, S., Tzimiropoulos, G., & Pantic, M. (2011). Subspace analysis of arbitrarily many linear filter responses with an application to face tracking.

Multi-scale/orientation local image analysis methods are valuable tools for obtaining highly distinctive image-based representations. Very often, these features are generated from the responses of a bank of linear filters corresponding to different s... Read More about Subspace analysis of arbitrarily many linear filter responses with an application to face tracking.

Analysing the playground: sensitizing concepts to inform systems that promote playful interaction (2011)
Book Chapter
Rennick-Egglestone, S., Walker, B., Marshall, J., Benford, S., & McAuley, D. (2011). Analysing the playground: sensitizing concepts to inform systems that promote playful interaction. In P. Campos, N. Graham, J. Jorge, N. Nunes, P. Palanque, & M. Winckler (Eds.), Human-computer interaction - INTERACT 2011:13th IFIP TC 13 International Conference, Lisbon, Portugal, September 5-9, 2011: proceedings. Lisbon, Portugal: Springer. https://doi.org/10.1007/978-3-642-23774-4

Playful interaction in an important topic in HCI research, and there is an ongoing debate about the fundamental principles that underpin playful systems. This paper makes a contribution to this debate by outlining a set of sensitizing concepts which... Read More about Analysing the playground: sensitizing concepts to inform systems that promote playful interaction.

Simulating the dynamics of T cell subsets throughout the lifetime (2011)
Book Chapter
Foan, S., Jackson, A. M., Spendlove, I., & Aickelin, U. (2011). Simulating the dynamics of T cell subsets throughout the lifetime. In P. Liò, G. Nicosia, & T. Stibor (Eds.), Artificial immune systems: 10th international conference, ICARIS 2011, Cambridge, UK, July 18-21, 2011: proceedings. Springer

It is widely accepted that the immune system undergoes age-related changes correlating with increased disease in the elderly. T cell subsets have been implicated. The aim of this work is firstly to implement and validate a simulation
of T regulatory... Read More about Simulating the dynamics of T cell subsets throughout the lifetime.

A first approach on modelling staff proactiveness in retail simulation models (2011)
Journal Article
Siebers, P.-O., & Aickelin, U. (2011). A first approach on modelling staff proactiveness in retail simulation models. Journal of Artificial Societies and Social Simulation, 14(2), https://doi.org/10.18564/jasss.1760

There has been a noticeable shift in the relative composition of the industry in the developed countries in recent years; manufacturing is decreasing while the service sector is becoming more important. However, currently most
simulation models for... Read More about A first approach on modelling staff proactiveness in retail simulation models.

Systems dynamics or agent-based modelling for immune simulation? (2011)
Book Chapter
Figueredo, G. P., Aickelin, U., & Siebers, P. (2011). Systems dynamics or agent-based modelling for immune simulation?. In P. Liò, G. Nicosia, & T. Stibor (Eds.), Artificial immune systems: 10th international conference, ICARIS 2011, Cambridge, UK, July 18-21, 2011: proceedings. Springer

In immune system simulation there are two competing simulation approaches: System Dynamics Simulation (SDS) and Agent-Based Simulation (ABS). In the literature there is little guidance on how to choose the best approach for a specific immune problem.... Read More about Systems dynamics or agent-based modelling for immune simulation?.