Edinburgh Napier University

About: Edinburgh Napier University is a education organization based out in Edinburgh, United Kingdom. It is known for research contribution in the topics: Population & Context (language use). The organization has 2665 authors who have published 6859 publications receiving 175272 citations.

Comprehensive Taxonomies of Nature- and Bio-inspired Optimization: Inspiration Versus Algorithmic Behavior, Critical Analysis Recommendations

Abstract: In recent algorithmic family simulates different biological processes observed in Nature in order to efficiently address complex optimization problems. In the last years the number of bio-inspired optimization approaches in literature has grown considerably, reaching unprecedented levels that dark the future prospects of this field of research. This paper addresses this problem by proposing two comprehensive, principle-based taxonomies that allow researchers to organize existing and future algorithmic developments into well-defined categories, considering two different criteria: the source of inspiration and the behavior of each algorithm. Using these taxonomies we review more than three hundred publications dealing with nature-inspired and bio-inspired algorithms, and proposals falling within each of these categories are examined, leading to a critical summary of design trends and similarities between them, and the identification of the most similar classical algorithm for each reviewed paper. From our analysis we conclude that a poor relationship is often found between the natural inspiration of an algorithm and its behavior. Furthermore, similarities in terms of behavior between different algorithms are greater than what is claimed in their public disclosure: specifically, we show that more than one-third of the reviewed bio-inspired solvers are versions of classical algorithms. Grounded on the conclusions of our critical analysis, we give several recommendations and points of improvement for better methodological practices in this active and growing research field.

Family leave policies and devolution to the line

Abstract: Using evidence drawn from case studies in four companies in the Scottish financial sector, this paper examines how both statutory and company family leave policies are operated by line managers. This paper considers the extent of line managers’ knowledge of statutory and company family leave policies and finds that their knowledge, particularly of statutory measures, is often wanting. In exploring the reasons for this situation, training on statutory and company family leave policies was found to be extremely limited and although support from human resource professionals was provided, line managers only referred to them in exceptional circumstances. This situation has clear implications both for consistency of operation of these policies and for the role of human resource professionals in ensuring that statutory and company provisions are effectively put into practice.

Parental presence during resuscitation in the PICU: the parents’ experience

Abstract: Aim and objective. To provide in-depth understanding of the meaning for parents who were present or absent during a resuscitation attempt on their child in the PICU. Background. Family presence during resuscitation remains a topic of debate with both benefits and disadvantages identified, yet few studies have asked parents of children in PICU to describe their experiences of being present or absent during this resuscitation and what this means to their understanding and coping. Additionally, minimal research has investigated parental presence during a successful resuscitation. Design. A qualitative design was used based upon van Manen’s interpretative phenomenological approach. Methods. Fourteen parents of critically ill children from one paediatric intensive care unit in Australia, who had either survived or died following a resuscitation attempt were interviewed. Results. Four main themes were identified: (1) being only for a child; (2) making sense of a living nightmare; (3) maintaining hope in the face of reality; (4) living in a relationship with staff. Conclusions. The findings underpin the inherent need for parents to choose to be present during resuscitation to make sense of the situation. Memories of the resuscitation were not long-lasting and distress was for the potential death of a child, rather than the resuscitation scene. Parents who did not witness their child’s resuscitation were more distressed than those who did. Having the opportunity to make the decision to stay or leave was important for parents. Support during the resuscitation was best provided by experienced clinical nurses. Relevance to practice. Recognition of the parents’ compelling need to stay will improve nurses’ understanding of how witnessing this event may assist family coping and functioning. Ways in which parents may be better supported in making the decision to stay or leave during resuscitation are identified.

Algorithms for logit-based stochastic user equilibrium assignment

Abstract: The paper proposes an efficient algorithm for determining the stochastic user equilibrium solution for logit-based loading. The commonly used Method of Successive Averages typically has a very slow convergence rate. The new algorithm described here uses Williams’ result [ Williams, (1977) On the formation of travel demand models and economic evaluation measures of user benefit. Environment and Planning 9A(3), 285–344] which enables the expected value of the perceived travel costs Srs to be readily calculated for any flow vector x. This enables the value of the Sheffi and Powell, 1982 objective function [Sheffi, Y. and Powell, W. B. (1982) An algorithm for the equilibrium assignment problem with random link times. Networks 12(2), 191–207], and its gradient in any specified search direction, to be calculated. It is then shown how, at each iteration, an optimal step length along the search direction can be easily estimated, rather than using the pre-set step lengths, thus giving much faster convergence. The basic algorithm uses the standard search direction (towards the auxiliary solution). In addition the performance of two further versions of the algorithm are investigated, both of which use an optimal step length but alternative search directions, based on the Davidon–Fletcher–Powell function minimisation method. The first is an unconstrained and the second a constrained version. Comparisons are made of all three versions of the algorithm, using a number of test networks ranging from a simple three-link network to one with almost 3000 links. It is found that for all but the smallest network the version using the standard search direction gives the fastest rate of convergence. Extensions to allow for multiple user classes and elastic demand are also possible.

Overview of porous media/metal foam application in fuel cells and solar power systems

Abstract: Fuel cells and solar energy are promising candidates for electricity generation. It is forecast that fuel cells and solar power systems will play an important role in reducing the greenhouse gas footprint and replacing fossil fuels. Therefore, the limitations of fuel cells and solar power systems, such as low efficiency, high cost, and low reliability, must be addressed appropriately to enable their full potentials. Metal foam is a new class of material that has gained immense attention due to its excellent properties suitable for a wide range of applications. Its unique characteristics distinguish it from typical solid metals. The properties of metal foam can be modified during the fabrication stage by manipulating its physical structure. The goal of this paper is to review the application of metal foam in fuel cells and solar power systems. Besides, the performance of metal foam in fuel cells and solar systems is also discussed. Metal foam has been applied to the electrodes, gas diffusion layer and flow field of fuel cells to enhance performance, especially in regard to current density and flow distribution. Furthermore, metal foam is a heat exchanger for the solar energy harvesting system to improve its efficiency. Superior performances in experimental testing allows the possibility of commercialization of metal foam products in the renewable energy field.