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UKACC International Conference on Control (CONTROL)

作者： Victor Vladareanu Paul Schiopu Shuang Cang Hongnian Yu Mingcong Deng Faculty of Electronics “Politehnica” University of Bucharest Bucharest ROMANIA School of Design Engineering and Computing Bournemouth University UK Dept. of Electrical and Electronic Eng. Koganei Tokyo University of Agriculture and Technology Tokyo JAPAN

The paper presents a new control method for the real time control of rescue robots' actuators, using the concepts and ideas of Extenics Theory. The controller uses the Dependent Function to measure the degree of compatibility of the process variable and combines this information with the derivative of the system error. It then takes the appropriate action to force the system into convergence around a desired set point. This builds upon the previous single-input Extenics controller and leads to a slightly more complex implementation with markedly better results, while retaining the ease of defining and adjusting the associated parameters and rule base. The output of the Dependent Function classifies the process variable value into one of four categories, concurrent with the nested intervals used in Extenics Theory. The rationality and validity of the proposed model are demonstrated through simulation in the Matlab/Simulink environment. The controller is then compared to a selection of other possible controllers. Throughout the paper, opportunities for further improvement and research are highlighted and discussed.

关键词： Process control DC motors Robots Convergence MATLAB Smoothing methods Complexity theory

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design considerations for carbon steel pipes materials' selection applied in fossil powered plants subjected to wet-steam flowaccelerated- corrosion review paper

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Journal of Corrosion Science and engineering 2013年 16卷 1-13页

作者： Dobson, Peter Khan, Zulfiqar Ahmad School of Design Engineering and Computing Bournemouth University Talbot Campus Fern Barrow Dorset BH12 5BB United Kingdom

FAC has only been recognized in the past three to four decades as a corrosion mechanism and has not been greatly understood until recently. There are a wide range of factors that affect the rate of FAC including chemistry, geometry and physical conditions inside the pipe. It is interesting to comprehend all of the factors of FAC within a steam pipe with two-phase flow to see how the temperature makes a difference to the corrosion rates. There are certain unique aspects of steam piping for fossil plants due to its fluid dynamics and control. The analysis of FAC will bring together different aspects using calculated examples and describe how they occur in detail, it gives awareness of the factors and how to calculate their effects. Safety and the integrity of the pipe have been carefully considered and methodologies of reducing FAC have been defined. © 2013 University of Manchester and the authors.

关键词： Reynolds number

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Texture-aware fast global level set evolution

Texture-aware fast global level set evolution

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4th International Conference on Intelligence Science and Big Data engineering, IScIDE 2013

作者： Balla-Arabé, Souleymane Gao, Xinbo Xu, Lai School of Electronic Engineering Xidian University Xi'an Shaanxi 710071 China School of Design Engineering and Computing Bournemouth University United Kingdom

ISBN: (纸本)9783642420566

Due to its intrinsic advantages such as the ability to automatically handle complex shapes and topological changes, the level set method has been widely used in image segmentation. Nevertheless, in addition to be computational expensive, it has the limitation to very often lead to a local minimum because of the energy functional to be minimized is non-convex. In this work, we use the geometric active contours and the image thresholding frameworks to design a novel method for global image segmentation. The local lattice Boltzmann method is used to solve the level set equation. The proposed algorithm is therefore effective and highly parallelizable. Experimental results on satellite, natural and medical images demonstrate the effectiveness and the efficiency of the proposed method when implemented using an NVIDIA graphics processing units. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Graphics processing unit

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Low cost estimation of IQ imbalance for direct conversion transmitters

Low cost estimation of IQ imbalance for direct conversion tr...

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IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)

作者： Wei Li Yue Zhang Li-ke Huang John Cosmas Carsten Maple Jian Xiong Institute for Research in Applicable Computing University of Bedfordshire Luton UK Department of Computer Science and Technology University of Bedfordshrie UK Aeroflex UK School of Engineering and Design Brunel University London UK University Bedfordshire Luton UK Department of Electronic Engineering Shanghai Jiao Tong University China

A low cost frequency-dependent (FD) I/Q imbalance self-compensation scheme is investigated in this paper. The direct conversion transmitters are widely used in wireless systems. However, the unwanted image-frequencies and distortions are inevitably introduced into the direct conversion system. This problem is even severer in wideband systems. Therefore, the accurate estimation and compensation of I/Q imbalance is crucial. The current compensation method is based on external instruments or internal feedback path which introduces additional impairments and is expensive. This paper proposes a low cost FD I/Q imbalance self-IQ-demodulation based compensation scheme without using external calibration instruments. First, the impairments of baseband and RF components are investigated. Further, I/Q imbalance model is developed. Then, the proposed a self-IQ-demodulation based compensation scheme is investigated. The overall FD I/Q imbalance parameters are estimated by developing a self-IQ-demodulation algorithm. To realize this self-IQ-demodulation algorithm, this paper introduces minor modifications to the current power detector circuit and specially designed training signal. Afterwards, the estimated parameters are applied to the baseband equivalent compensator. This sophisticated algorithm guarantees low computation complexity and low cost. The compensation performance is evaluated in laboratory measurement.

关键词： Estimation Baseband Demodulation Transmitters Wideband Radio frequency RF signals

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Fuzzy logic based packet scheduling algorithm for Mobile Ad-Hoc Network with a realistic propagation model

Fuzzy logic based packet scheduling algorithm for Mobile Ad-...

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19th International Conference on Automation and computing, ICAC 2013

作者： Egaji, Oche A. Griffiths, Alison Hasan, Mohammad S. Yu, Hongnian Faculty of Computing Engineering and Sciences Staffordshire University Stafford United Kingdom School of Design Engineering and Computing Bournemouth University Fern-Barrow-Pool-Dorset United Kingdom

ISBN: (纸本)9781908549082

In this paper, we propose a priority based scheduling algorithm for Mobile Ad-hoc Network (MANET) using fuzzy logic. The fuzzy system has three inputs: data rate, Signal-to-Noise Ratio (SNR) and queue size. The fuzzy system was verified using MATLAB fuzzy toolbox and the performance of the algorithm was evaluated using OPNET simulator. The results were compared to an existing fuzzy scheduler. The measuring metrics which form the basis for the performance evaluation were end-to-end delay, throughput and packet delivery ratio. The proposed scheduler performed better than the existing scheduler;an average improvement of 37% for end-to-end delay, 56% for throughput and 57% for the packet delivery ratio. However, this comes at the cost of additional computational complexity. The existing fuzzy scheduler injects an additional packet processing time of 46ns whilst the proposed scheduler injects 165ns. © 2013 Chinese Automation and computing Society in the UK - CACS.

关键词： Mobile ad hoc networks

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Reasoning with contextual requirements: Detecting inconsistency and conflicts

Reasoning with contextual requirements: Detecting inconsiste...

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作者： Ali, Raian Dalpiaz, Fabiano Giorgini, Paolo School of Design Engineering and Computing Bournemouth University United Kingdom Department of Information Engineering and Computer Science University of Trento Italy

Context: The environment in which the system operates, its context, is variable. The autonomous ability of a software to adapt to context has to be planned since the requirements analysis stage as a strong mutual influence between requirements and context does exist. On the one hand, context is a main factor to decide whether to activate a requirement, the applicable alternatives to meet an activated requirement as well as their qualities. On the other hand, the system actions to reach requirements could cause changes in the context. Objectives: Modelling the relationship between requirements and context is a complex task and developing error-free models is hard to achieve without an automated support. The main objective of this paper is to develop a set of automated analysis mechanisms to support the requirements engineers to detect and analyze modelling errors in contextual requirements models. Method: We study the analysis of the contextual goal model which is a requirements model that weaves together the variability of both context and requirements. Goal models are used during the early stages of software development and, thus, our analysis detects errors early in the development process. We develop two analysis mechanisms to detect two kinds of modelling errors. The first mechanism concerns the detection of inconsistent specification of contexts in a goal model. The second concerns the detection of conflicting context changes that arise as a consequence of the actions performed by the system to meet different requirements simultaneously. We support our analysis with a CASE tool and provide a systematic process that guides the construction and analysis of contextual goal models. We illustrate and evaluate our framework via a case study on a smart-home system for supporting the life of people having dementia problems. Results: The evaluation showed a significant ability of our analysis mechanisms to detect errors which were not notable by requirements engineers.

关键词： Requirements engineering

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Topic Selection in Latent Dirichlet Allocation

Topic Selection in Latent Dirichlet Allocation

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The 2014 10th International Conference on Natural Computation (ICNC 2014) and the 2014 11th International Conference on Fuzzy Systems and Knowledge Discovery (FSKD 2014)(第十届自然计算和第十一届模糊系统与知识发现国际会议)

作者： Biao Wang Yang Liu Maozhen Li Zelong Liu Man Qi State Grid Sichuan Electric Power Research Institute Chengdu China School of Electrical Engineering and Information Systems Sichuan University Chengdu 610065 China School of Engineering and Design Brunel University Uxbridge UB8 3PH UK Department of Computing Canterbury Christ Church University Canterbury Kent CT1 1QU UK

ISBN: (纸本)9781479951499

Latent Dirichlet Allocation(LDA)has been widely applied to text *** is a probabilistic topic model which processes documents as the probability distribution of *** challenging issue in application of LDA is to select the optimal number of topics in LDA *** paper presents a topic selection method which considers the density of each topic and computes the most unstable topic structure through an iteration *** results show that the proposed method can generate an optimal number of topics automatically with a small number of iterations.

关键词： MapReduce job scheduling data locality

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Stroke-Based Surface Reconstruction

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Numerical Mathematics(Theory,Methods and Applications) 2013年第1期6卷 297-324页

作者： Jooyoung Hahn Jie Qiu Eiji Sugisaki Lei Jia Xue-Cheng Tai Hock Soon Seah Institute of Mathematics and Scientific Computing University of GrazAustria School of Computer Engineering Nanyang Technological UniversitySingapore N-Design Inc. Japan Mathematics Institute University of BergenNorway

In this paper,we present a surface reconstruction via 2D strokes and a vector field on the strokes based on a two-step *** the first step,from sparse strokes drawn by artists and a given vector field on the strokes,we propose a nonlinear vector interpolation combining total variation(TV)and H1 regularization with a curl-free constraint for obtaining a dense vector *** the second step,a height map is obtained by integrating the dense vector field in the first *** discontinuities in surface and discontinuities of surface gradients can be well reconstructed without any surface *** also provide a fast and efficient algorithm for solving the proposed *** vectors on the strokes are interpreted as a projection of surface gradients onto the plane,different types of strokes are easily devised to generate geometrically crucial structures such as ridge,valley,jump,bump,and dip on the *** stroke types help users to create a surface which they intuitively imagine from 2D *** compare our results with conventional methods via many examples.

关键词： Surface reconstruction from a sparse vector field augmented Lagrangian method twostep method curl-free constraint total variation regularization preservation of discontinuities in surface normal vectors

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Intelligent extended control of the walking robot motion

Intelligent extended control of the walking robot motion

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International Conference on Advanced Mechatronic Systems (ICAMechS)

作者： Victor Vladareanu Paul Schiopu Mingcong Deng Hongnian Yu Faculty of Electronics II 313 Sp. Independenţei “Politehnica” University of Bucharest Bucharest ROMANIA Dept. of Electrical and Electronic Eng. Koganei Tokyo University of Agriculture and Technology Tokyo JAPAN School of Design Engineering and Computing Bournemouth University Poole Dorset UK

The paper presents the design and simulation of a three degrees-of-freedom robotic device for use in an autonomous robotic platform. The tracking reference for the angular joints is given using a trained neuro-fuzzy model instead of the usual inverse kinematic system. The joint actuators are driven using a selection of position controllers and a comparison for their performance is provided. The paper draws on some previously investigated concepts of great actuality to the field such as neuro-fuzzy networks, Extenics and reduced-base fuzzy control.

关键词： Robot kinematics Legged locomotion Fuzzy logic Joints Kinematics Inference algorithms

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A structural equation model for predicting virtual enterprise and agile supply chain relation

A structural equation model for predicting virtual enterpris...

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19th International Conference on Automation and computing, ICAC 2013

作者： Samdantsoodol, Ariunbayar Yu, Hongnian Cang, Shuang Tumur-Ochir, Angarag Faculty of Computing Engineering and Sciences Staffordshire University Stafford United Kingdom School of Design Engineering and Computing Bournemouth University Poole United Kingdom School of Tourism Bournemouth University Poole United Kingdom School of Mechanical Engineering Mongolian University of Science and Technology Ulaanbaatar Mongolia

ISBN: (纸本)9781908549082

In today's ever-changing market, global competition, technology development, customer demands, and decreases of product life cycles push logistics organizations in a supply chain (SC) to shift towards to flexible, robust, autonomy, responsive, and collaborative organization such as a virtual enterprise (VE). Internet and mobile technology support SMEs collaboration to establish VE with an inter-organizational network, virtual organization and integration based on core capabilities of partners. To survive in the competitive market, these SCs require agility and effectiveness which are obtained by forming highly dynamic VEs within supplier networks. Therefore academic and corporate interest in VE in supply chain management (SCM) has increased considerably in recent years. This paper aims to investigate the relationship between VE and agile SC (ASC) and provide further insights into the enhancement of enterprise capability and adoption of ICT and its impacts on VE in SCM. A conceptual hypothetical model is proposed to demonstrate impacts of three factors on ASC. To clarify the relationships among these, a structural equation model (SEM) is implied to examine the hypotheses based on observed data. The SEM consists of a measurement model (exploratory factor analysis-EFA and confirmatory factor analysis-CFA) and a structural model (path analysis). The results provide empirical evidence that the beneficial impacts of VE on the ASC. © 2013 Chinese Automation and computing Society in the UK - CACS.

关键词： Commerce

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