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The investigation of dynamics of the real-life natural vibrations in structures, compared with the simulated by finite-element model frequency values and their variations, could be used for monitoring of the structural health of the composite materials. Experimental modal analysis of an example maritime composite panel is presented in the current work. The previously developed setup of the measurement...
Additive-layered manufacturing has gained attentionin recent years as it has many advantages over conventionalinjection moulding methods. The optimization of printing trajectoriescan be formulated as a travelling salesman problem (TSP) and solved accordingly. However, computational complexities ofordinary TSP solvers can increase tremendously with the scaleof the problem, which make them impractical...
Conservation voltage reduction (CVR), the theory that reducing distribution feeder voltages will result in a reduction in demand, has recently been reintroduced with the aim of improving overall energy efficiency. Although CVR is a simple and cost-effective scheme, reducing voltages may not always be the most beneficial decision in terms of reducing demand. In fact, for certain types of load, reducing...
Today, Apache Cassandra, an highly scalable and available NoSql datastore, is largely used by enterprises of each size and for application areas that range from entertainment to big data analytics. Managed Cassandra service providers are emerging to hide the complexity of the installation, fine tuning and operation of Cassandra datacenters. As for all complex services, human assisted management of...
Reverse proxies are key performance elements of a content distribution network (CDN) and operate as intermediaries between client and upstream (or origin) server traffic. A typical reverse proxy server aims to distribute user workload, more or less equally, among multiple upstream servers. To keep the pace with the growing demand for content, CDNs regularly expand their capacity by adding extra upstream...
Self-organising resource-flow systems typically havea high tolerance for component faults: When a component fails, the system can use another component of the same type instead. However, this redundancy is eventually exhausted: If enoughcomponents fail, they can no longer be replaced and the systemceases to function. An analysis of these self-organisation limitsis essential to assess the system's...
The UK is one of these countries in Europe, which have the highest death rate from asthma, and the rules to identify asthma control steps are vague in the current official guideline of asthma management. In this research, diagnosis rules on asthma control steps are developed to supplement the current guideline and to assist patients to monitor and manage their asthma on daily basis. The main challenge...
The cost incurred from operations and maintenance activity for offshore wind turbines contributes significantly to the overall lifecycle cost for offshore wind farms. This work addresses the issue of identifying a near-optimal schedule for the planning of operations and maintenance activity for the turbines in an offshore wind farm. Significant cost savings can be realized by scheduling maintenance...
In this paper the design of a rig capable to simulate the dynamic response of an energy storing and returning composite prosthetic foot during amputee running is considered. It has been assumed that the amputee/prosthesis system can be modelled as a spring/mass system. Therefore the rig has been designed to allow the applied mass, input force and foot contact point of various feet designs to be varied...
In this paper the validation of a rig capable of simulating the dynamic response of an energy storing and returning composite prosthetic foot during amputee running is considered. It is shown that the rig can simulate the running action of an amputee runner and return similar ground contact time. It has also been shown that if a small input force is applied in a timed and sympathetic manner to the...
In the study the possibilities of using personal computers equipped with multi-core processors for optimisation calculations of complex technical objects were analysed. Desktops and portable computers, such as laptops, were compared. The exemplary object which was subject to the optimisation process was a three-phase, unshielded busduct in constant insulation. A genetic algorithm method was used for...
700-nm-thick silicon nitride-on-insulator is widely used for nonlinear applications. Apodizing is extensively used in designing Si-on-insulator waveguides. Here we present a new design and optimization method for 700-nm-thick Si3N4 grating couplers. A simulation peak coupling efficiency of −3.05 dB is achieved with the 1 dB bandwidth 51 nm. The apodized grating coupler is compatible with deep-UV lithography...
Numerical reproducibility failures rise in parallel computation because of the non-associativity of floating-point summation. Optimizations on massively parallel systems dynamically modify the floating-point operation order. Hence, numerical results may change from one run to another. We propose to ensure reproducibility by extending as far as possible the IEEE-754 correct rounding property to larger...
The design of high quality electron generators is important for a variety of applications including materials processing systems (including welding, cutting and additive manufacture), X-ray tubes for medical, scientific and industrial applications, microscopy, and lithography for integrated circuit manufacture. The many variants of electron gun required, and the increasing demands for highly optimised...
In many spectral estimation and array processing problems, the process of finding estimates of model parameters often involves the optimisation of a cost function containing multiple peaks and dips. Such non-convex problems are hard to solve using traditional optimisation algorithms developed for convex problems, and computationally intensive grid searches are therefore often used instead. In this...
One polygeneration node is an energy system where the user demands are met by different generation sources, possibly including renewable energy inputs and energy storages. User demands can involve one single energy vector like electricity, heating, cooling etc. or can be a combination of all of them at the same time. The management strategy of these systems is not univocal since different mix of production...
Recently, the railway sector is required to improve energy efficiency. Since no additional hardware investment is required, the authors are focused on the optimisation of the train timetable for less energy consumption. Train timetable contains the slack time for each interstation for robustness against delay. Although energy consumption can be reduced by the slack time, the slack time distribution...
With rising concerns on energy and environment, the energy-efficient operation techniques in railway systems are paid more attention in recent years. The metro-transit system has some distinguishing features like short headway and a high number of stations with short interstation distance, which makes effectively using regenerative energy becoming more significant in the energy-saving study. This...
Deep neural networks are more accurate, but require more computational power in the learning process. Moreover, it is an iterative process. The goal of the research is to investigate efficiency of solving this problem on MIC architecture without changing baseline algorithm. Well-known code vectorization and parallelization methods are used to increase the effectiveness of the program on MIC architecture...
AC magnetic flux density meters usually integrate a high pass filter with a very low cut-off frequency (1 Hz–30 Hz) aiming at reducing the effect of slow oscillations. This can distort the actual time domain behaviour of induction waveforms detectable close to industrial or medical devices, even causing artefact high amplitude oscillations. This paper proposes a procedure to identify the filter parameters...
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