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2nd International conference on human Aspects of Information Security, Privacy, and Trust, HAS 2014 - Held as Part of 16th International conference on human-Computer Interaction, HCI International 2014

作者： Caulfield, Tristan Pym, David Williams, Julian Department of Computer Science University College London United Kingdom Business School University of Durham United Kingdom

ISBN: (纸本)9783319076195

Security managers face the challenge of formulating and implementing policies that deliver their desired system security postures - for example, their preferred balance of confidentiality, integrity, and availability - within budget (monetary and otherwise). In this paper, we describe a security modelling methodology, grounded in rigorous mathematical systems modelling and economics, that captures the managers' policies and the behavioural choices of agents operating within the system. Models are executable, so allowing systematic experimental exploration of the system-policy co-design space, and compositional, so managing the complexity of large-scale systems. © 2014 Springer International Publishing.

关键词： Economics

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Particle swarm-based vertebrae spine modelling for steering vibration impact analysis 15

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15th International conference on Biomedical engineering, ICBME 2013

作者： Toha, Siti Fauziah Department of Mechatronics International Islamic University Malaysia Malaysia

ISBN: (纸本)9783319029122

Vibrations due to steering motions always gave direct vertical impact towards human vertebrae spine. A lot of studies are carried by various researchers in this field, evaluating the injury risks to vertebrae when it exposed to vertical vibration. One of the major risks associated is low back pain which accounts to major economic loss in terms of direct and indirect costs. Therefore, an accurate vertebrae modelling is of prime important for vibration suppression analysis. The whitebox model of the vertebrae is obtained using Rayleigh beam element, which account for bending and rotary inertia. Followed by the muscle strength and the inter-vertebrae fluid are represented by a spring damper system. The objective of this paper is to apply a grey-box modelling approach to model the dynamic behaviour of human vertebrae. The conjecture is that the white-box model will retain what is known about the physical behaviour of the vertebrae using mathematical modelling. The black-box modelling using particle swarm optimisation (PSO) will then used the input and output information from the white-box model to obtain an accurate transfer function parameters. In order to increase robustness to the model, effects of phenomena that are not modelled in the white-box model such as vehicle speed variation is included. The greybox model is therefore yield an accurate model of the human vertebrae which is suitable for further investigation using active vibration suppression control. Correlation tests are carried out to determine the effectiveness of the modelling technique. It is evidence that the model complies with all the five correlation tests, indicating that the model behaviour is unbiased. © Springer International Publishing Switzerland 2014.

关键词： Vibration analysis

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Safety properties modelling

Safety properties modelling

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7th International conference on human System Interactions (HSI)

作者： Tanzi, Tullio J. Textoris, Raoul Apvrille, Ludovic Telecom ParisTech Inst Mines Telecom CNRS LTCI UMR 5141 Sophia Antipolis France LOreal Clichy Paris France Mines Pparis Tech Ctr Rech Risques Crises Sophia Antipolis France

ISBN: (纸本)9781479947140

In critical applications regarding safety, a solution must be validated before it is applied on the field. It is forbidden to test solutions directly on the real system for safety reasons. Any attempt of modification or introduction of a safety system must be approached with the utmost care. The proposed solutions must be validated, and, if possible, formally validated. It is the case of prevention systems for accidents, installed on highways. They also are in charge of gathering information in the case of an accident actually occurring. In this context, we aim to provide an approach to validate the behaviour of a critical system before its effective realisation. The system is modelled by a combination of agents spread around the world and working together in real-time. The agents' behaviour is modelled via an UML SysML model. Thanks to the tools available in the TTool environment and the ones developed only for this purpose, we can animate those agents and confirm, or not, their behaviour on various test situations (applications' rapid prototyping). Since the tests are not covering all the possibilities, we move to, then, verify formally the critical properties. This formal analysis is made possible by the mathematical grounds of the tool we use. The analysed properties are mainly safety properties;results regarding performance results are available as well.

关键词： Formal Methods modelling Safety Properties

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modelling flow and work hardening behaviour of cold worked Zr-2.5Nb pressure tube material in the temperature range of 30-600 °C

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NUCLEAR engineering AND DESIGN 2014年 269卷 52-56页

作者： Dureja, A. K. Sinha, S. K. Pawaskar, D. N. Seshu, P. Chakravartty, J. K. Sinha, R. K. Bhabha Atom Res Ctr Reactor Design & Dev Grp Mumbai 400085 Maharashtra India Indian Inst Technol Dept Mech Engn Mumbai 400076 Maharashtra India Bhabha Atom Res Ctr Mech Met Div Mumbai 400085 Maharashtra India Dept Atom Energy Mumbai Maharashtra India

Under a postulated accident scenario of loss of cooling medium in an Indian Pressurised Heavy Water Reactor (IPHWR), temperature of the pressure tubes can rise and lead to large deformations. In order to investigate the modes of deformation of pressure tube - calandria tube assembly, material property data defining the flow behaviour over a temperature range from room temperature (RT) to 800 degrees C are needed. It is of practical importance to formulate mathematical equations to describe the stress-strain relationships of a material for a variety of reasons, such as the analysis of forming operations and the assessment of component's performance in service. A number of constitutive relations of empirical nature have been proposed and they have been found very suitable to describe the behaviour of a material. Although these relations are of empirical nature, various metallurgical factors appear to decide applicability of each of these relations. For example, grain size influences mainly the friction stress while the strain hardening is governed by dislocation density. In a recent work, tensile deformation behaviour of pressure tube material of IPHWR has been carried out over a range of temperature and strain rates (Dureja et al., 2011). It has been found that the strength parameters (yield and ultimate tensile strength) vary along the length of the tube with higher strength at the trailing end as compared to the leading end. This stems from cooling of the billet during the extrusion process which results in the variation of microstructure, texture and dislocation density from the leading to the trailing end. In addition, the variation in metallurgical parameters is also expected to influence the work hardening behaviour, which is known to control the plastic instability (related to uniform strain). In the present investigation, the tensile flow and work-hardening behaviour of a cold worked Zr-2.5Nb pressure tube material of IPHWRs has been studied over the temperat

关键词： METALS -- Cold working HARDENING (Heat treatment) METALS -- Hardenability ZIRCONIUM alloys HEAVY water reactors EXTRUSION process

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Development of a backdrivable magnetorheological hydraulic piston for passive and active linear actuation

Development of a backdrivable magnetorheological hydraulic p...

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IEEE/RSJ International conference on Intelligent Robots and Systems

作者： G. A. Dominguez M. Kamezaki M. French S. Sugano Graduate Program for Embodiment Informatics for Leading Graduate Schools Japan Research Institute for Science and Engineering (RISE) Waseda University Tokyo Japan Graduate Program for Embodiment Informatics for Leading Graduate Schools Waseda University Tokyo Japan Department of Modern Mechanical Engineering Waseda University Shinjuku-ku Tokyo Japan

A new design of a magnetorheological piston prototype intended for passive or active force control in robotic applications for human robot interaction is introduced. It is based in a novel toroidal array of valves, contained within the piston head, which are used to control the output force of the actuator in order to achieve a high degree of reliability, size efficiency, and safety, by exploiting the material properties of magnetorheological fluids and permalloy metals. This paper describes the main points in the development of the magnetorheological piston prototype, the mathematical modelling of the magnetic circuit, and the results of the experiments conducted using a universal testing machine to evaluate the passive performance of the prototype. Results show the feasibility and performance of the new toroidal magnetic circuit of the magnetorheological hydraulic piston prototype. Improvements in order to be able to test the active performance of the design together with a pump setup are proposed.

关键词： Pistons Toroidal magnetic fields Magnetomechanical effects Magnetic heads Actuators Magnetic circuits Valves

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Demographic Characteristics of College Students Impact on Green Consumer Behavior in Beijing

Demographic Characteristics of College Students Impact on Gr...

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2015 International conference on Simulation, modelling and mathematical Statistics(SMMS 2015)

作者： Yue GU Yan ZHAO Chun-tong QIU Beijing Informat Sci.& Technol Univ. Sch.Econ.& Management

With the rapid increase of the number of the world population, the ecological environment has been consumed and destroyed. In this case, researchers around the world actively seek solutions and finally proposed the lifestyle of green consumption behavior. Based on the research, we carry out reliability test, descriptive analysis and the binary Logistic regression analysis using SPSS19.0. To analysis the relationship between demographic characteristics of college students, we found that females, people with high monthly consumption and people who learn about the environment, prefer to implement green consumer behavior and. Based on the data, we promote several suggestions about green consumption patterns. We hope it would play a role for the future of human development and environmental protection.

关键词： Green Consumption Green consumer behavior Demographic characteristics

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ON THE SYNTHESIS OF HYPERBOLOID GEAR DRIVES AND TECHNICAL APPLICATION

ON THE SYNTHESIS OF HYPERBOLOID GEAR DRIVES AND TECHNICAL AP...

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ASME International Design engineering Technical conferences and Computers and Information in engineering conference (IDETC/CIE)

作者： Abadjieva, Emilia Abadjiev, Valentin Kawasaki, Haruhisa Mouri, Tetsuya Bulgarian Acad Sci Inst Mech Sofia Bulgaria Gifu Univ Fac Engn Dept Human & Informat Gifu 50111 Japan

ISBN: (纸本)9780791855928

Hyperboloid drives (spatial skew-axes gears) are used to transform rotation between shafts with non-parallel and non-intersecting axes. In this paper the principles of mathematical modelling of a tooth contact synthesis for this common gearing case are discussed. The presented research shows that synthesis of hyperboloid gear drives can be achieved by application of mathematical model upon a pitch contact point. This approach is applied to the synthesis of spatial gear sets of Spiroid and Heliconl types.

关键词： Design

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mathematical and numerical simulation of a biological model in storage facilities for argan waste 17

Mathematical and numerical simulation of a biological model ...

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17th AES-ATEMA International conference on Advances and Trends in engineering Materials and Their Applications, ATEMA MONTREAL 2014

作者： Men-La-Yakhaf, S. Gueraoui, K. Driouich, M. Haddad, Y.M. Team of Modelling in Fluid Mechanics and Environment LPT URAC 13 Faculty of Sciences Mohammed V. University Rabat-Agdal B.P. 1014 Rabat Morocco Département de Génie Mécanique Université d'Ottawa OttawaK1N 6N5 Canada

ISBN: (纸本)9781927838020

We simulated a mathematical model to the real behaviour of the bioreactor in the anaerobic methanogen phase. This coupled model is composed of a bi-phase basis of the conservation of matter, energy and thermodynamic functions we adopted the model of Van Genuchten and a biological model based on the model of Monod. This model takes into account the bacterial activity, biological behaviour and concentrations deferent components. Using the finite volume method for conservation equations and the method of Rang-Kutta for biological equations. © 2014, Advanced engineering Solutions (***) Ottawa, Canada.

关键词： Numerical models

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Reusing simulated evacuation behaviour in a game engine 2014

Reusing simulated evacuation behaviour in a game engine

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10th Australian conference on Interactive Entertainment, IE 2014

作者： Xi, Mingze Smith, Shamus P. School of Electrical Engineering and Computer Science University of Newcastle CallaghanNSW2308 Australia

ISBN: (纸本)9781450327909

Virtual environments have been used to develop fire evacuation training systems which benefit from high levels of graphical realism and various interaction methods. However, virtual environment-based fire evacuation training systems often have limited non player character (NPC) behaviours as realistic fire evacuation models are difficult to build as they require accurate fire science, for example the impact of poisonous gases, smoke, and heat on human behaviour. One solution is the reuse of fire evacuation modelling tools to drive NPC behaviours in virtual environments built with gaming technology. In this paper, a pipeline is proposed to embed human behaviour, based on realistic fire science knowledge, into virtual evacuation training systems. The pipeline starts with 3D building models and extracts simulated human behaviour from fire evacuation simulator tools and then integrates these behaviours into NPC movement scripts for use in a game engine. A case study is presented with 3D modelling in SketchUp, simulated behaviour in FDS + Evac and NPC scripts in Unity3D. Consistent evacuation time was found on overall egress time in both FDS+Evac and Unity3D. A scalability analysis of environment complexity showed a linear increase in evacuation time by scenario scale in Unity3D and FDS+Evac. © 2014 ACM.

关键词： Virtual reality

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A New Approach for Error Minimization of Piezoelectric Sensor Output Variations using Fuzzy Logic 4

A New Approach for Error Minimization of Piezoelectric Senso...

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4th IEEE International conference on Control System Computing and engineering (ICCSCE 2014)

作者： Ahmad, Rana Fayyaz Malik, Aamir Saeed Amin, Hafeezullah Kamel, Nidal Zafar, Raheel Qayyum, Abdul Univ Teknol Petronas Dept Elect & Elect Engn Ctr Intelligent Signal & Imaging Res Tronoh Malaysia

ISBN: (纸本)9781479956869

Performance of electronic sensors used for physical measurements is highly depends upon the operating conditions. Environmental changes e.g., temperature variations do affect the sensor outputs especially for those which are used for very precise measurement. The effect of temperature variation from ambient to the harsh drastically degrades the electronic sensor output performance e.g., piezoelectric sensor in our case. It is very hard to model the output variation of piezoelectric sensor whose output is non-deterministic or random in nature and it also change with temperature. Normal mathematical modelling techniques to correct error are very difficult to implement due to complexity and nonlinearity. Data has been acquired from piezoelectric sensor used for pressure measurement whose output variation is random in nature with respect to the temperature variations. The scope of this paper is to study the behaviour of piezoelectric sensor output signal taking into consideration the different varying temperature profiles. Artificial intelligence technique like Fuzzy is used to minimize the error up to desirable amount. The novelty in our work is that Fuzzy approach has been implemented on this kind of engineering problem. Results have been compared with mathematical technique i.e., curve fitting based upon the error correction criterion. Fuzzy approach has shown significant improvement in error minimization of piezoelectric sensor as compared to the mathematical techniques.

关键词： Piezoelectric Sensor Fuzzy modelling Error minimization

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