1,492 research outputs found
Network Association With Dynamic Pricing Over D2D-Enabled Heterogeneous Networks
No full textThe growing trend of networks densification has motivated integrating the Device-to-Device (D2D) communication with the dense heterogeneous networks in order to face the intense demand of high data rates and enhance network performance. However, this imposes challenges to develop innovative network association schemes that consider energy efficiency while meeting application quality requirements. In this context, we propose an efficient network association mechanism over D2D-enabled heterogeneous wireless networks. We consider different Quality of service (QoS) requirements, networks characteristics, and application requirements, in order to obtain an efficient- distributed solution that grasps the conflicting nature of the various objectives. The proposed methodology leverages a user-centric networks association approach over D2D-enabled heterogeneous wireless networks to enhance system performance and support reliable connectivity. Our results demonstrate the efficiency of the proposed scheme compared to the state-of-the-art techniques that ignore the potential of D2D communication.Scopu
Retrieval and reference
No full textKnowledge from study may be transferred in different ways: in words and images, via lectures and exhibitions, in the form of articles or books; and electronically.For the time being, the form used most frequently is written publication in text and illustration. However publishing on CD-ROM and the Internet are witnessing rapid development. Maybe this is going to have important consequences for the way in which people are searching for information. In this contribution we discuss some points needing attention for optimal accessibility of knowledge from study and suitably dealing with the sources used. We refer to handbooks for the conventional playing rules of reporting in writing such as clear and interest evoking titles of chapters and paragraphs, clear structure and table of contents, avoiding unnecessary jargon, a clear summary and their like.a,b The emphasis in this Chapter is on adequate pointers to references and the use of key-words.Before embarking, first, something about the way to stimulate potential readers to take notice of the information. It starts already with the cover and the titlepage. These give a first impression of what is waiting for the potential reader. With this author, text or images present themselves. One glance should make clear what the subject is; although it is sometimes attractive to confuse the reader. Starting from cover and title page, the reference data (copyright notice, year of publication, ISBN number, place of issue and publisher), table of contents, foreword (written by a recommending outsider or referee) and introduction, the reader is introduced from his own world into the world of the author. The author and those responsible for the lay-out should picture themselves in this process and shape the publication from the vantage point of potential readers (the target audience), their questions, their pre-suppositions, or lack thereof.Possible pre-suppositions of the reader should be supplemented or corrected. With this it is prevented that potential readers are thinking after a while “What the hell is this?” A clear text on the back cover, an index of key-words, a list of references and a sensible use of footnotes and final-notes are important conditions as well in order to achieve a publication that invites reading.Technical Ecology and Methodology (OLD)Real Estate Managemen
Stiffness-force feedback in UAV tele-operation
No full textAerospace Design, Integration and OperationsAerospace Engineerin
Tertiary patterns in inclined layer convection
No full textConvection in an inclined layer generates various types of spatio-temporal patterns due to interaction of buoyancy and shear. At small angles of incline, the secondary instability of the uniform base state occurs in the form of buoyancy dominated longitudinal rolls. Above a critical angle of incline marking a co-dimension 2 point, shear driven transverse roll instabilities take over as the secondary instabilities. Computing the location of the co-dimension 2 point for varying thermal driving and inclination angle and determining all secondary bifurcations together with the resulting tertiary states allows to characterize the nonlinear phase diagram of inclined layer convection system. The semi-analytically computed phase diagram quantitatively matches experimental observations by Daniels et al. Close to the co-dimension 2 point, a subcritical secondary bifurcation leading to bistability is identified. In the bistable region, heteroclinic cycles generate bursting behavior
Assessment of Models for Near Wall Behavior and Swirling Flows in Nuclear Reactor Sub-system Simulations
No full textAccurate simulation of turbulence remains one of the most challenging problems in nuclear reactor analysis and design. Due to limitations in computing resources, Reynolds averaged Navier Stokes models (RANS) continue to play an important role in reactor simulations. The Consortium for advanced simulations of light water reactors (CASL) is a Department of Energy technology hub that is investing in research and developmentof a state-of-the-art computational fluid dynamics capabilityto meet the challenges of turbulent simulation of nuclear reactors. In this presentation, we assess several RANS eddy viscosity models appropriate for single-phase incompressible turbulent flows. Specifically, we compare the single equation Splalart-Allmaras to several variations of the model. The assessment takes into consideration elements of full system reactor cores such as complex geometries, heterogeneous meshes, swirling flow, near wall flow behavior, heat transfer and robustness issues. The goal of this strategically oriented assessment is to provide an accurate and robust turbulent simulation capability for the CASL community. Metrics of performance will be constructed by comparing different models on a strategically chosen set of problems that represent reactor core sub-systems
Introduction
No full textThis methodological book describes eight forms of study as they relate to design:- Naming and describing;- Design research and typology;- Evaluating;- Modelling;- Programming and optimising;- Technical study;- Design study;- Study by design.These eight sections are the spine of the work. Its compartmentalisation is based on the work of two Methodology Committees of the Faculty of Architecture at the Technical University of Delft (in 1990 and in 2000 AD) and establishes, in this sense, the list of the methodological end-terms of the education. The sequencing of the sections and the chapters within them is showing a certain space for conditioning. Design research, for instance, is impossible without a description of the designs to be studied; in its turn describing study pre-supposes that the components and concepts in these designs can be named and retrieved (naming).Technical Ecology and Methodology (OLD)Real Estate Managemen
Types of study by design
No full textIn this book study by design – also called research by or through design – is defined as the development of knowledge by designing, studying the effects of this design, changing the design itself or its context, and studying the effects of the transformations. The ‘TOTE-model’ from systems analysis may be recognised in this : Test → Operate → Test → Exit. Methodologically this should be preceded by a pre-design study, particularly in order to ascertain which requirements should be met by the design; although a design does not need to be goal-directed by definition.Real Estate ManagementTechnical Ecology and Methodology (OLD
Criteria for scientific study and design
No full textCould a design be the product of scientific work to be compared with a scientific report? If so, under which conditions and when? The topic is eagerly discussed both within and outside of faculties of architecture. On the web-site of the Design Research Society (DRS) there is a lively debate on what a design study and a study by design really are and when a designer can also be designated a scientist. These questions stood central during the 1996 EAAE Congress organised by the Delft Faculty of Architecture on the theme ‘Doctorates in Design + Architecture’.a In order to answer these questions we discuss first the terms ‘research’ and ‘study’ and the usual pre-requisites that must be met for study to be designated ‘scientific’. Next, similarities and differences between designing and studying are dealt with. Following that, we discuss the usual way in the scientific community of looking at the criteria for a design to be branded as a product of scientific study. For that purpose a summary is given of the requirements the Technical University in Delft associates with a the rôle it played during the initiative leading to this handbook of design related study. Finally we give a specimen of criteria for evaluation of a scientific architectural design (ex post) and of a proposal for a design related study (ex ante).Technical Ecology and Methodology (OLD)Real Estate Managemen
Minimising number of sensors in wireless sensor networks for structure health monitoring systems
No full textSensor placement optimisation is an important problem in the field of structural health monitoring (SHM). Many researchers solve this problem by focusing only on the network requirements, without considering the civil engineering requirements. However, there are researchers that optimise the sensor placement considering network and civil requirements. Unfortunately, those researchers did not address minimising the number of sensors. As a result, in this research we study the problem of minimising the number of sensors for SHM in wireless sensors networks satisfying both civil and network requirements. The authors' contribution in this work is showing the mathematical model of the mentioned problem. Then, solve the problem using different methods: exhaustive search, genetic algorithm (GA), and a numerical iterative algorithm that applies binary search (BS). The problem is solved using different number of sensors as well as different placements in many conducted experiments. The obtained results showed that minimising the number of sensors becomes more significant with big structures. Furthermore, the BS algorithm is the best to use to solve the problem for small buildings. However, for larger buildings, there is a trade-off between the performance, and time complexity, where the BS gives optimal solution, but GA gives better time execution.This work was supported by the Qatar National Research Fund under Grant NPRP 06-150-2-059, and it was considered as a part of master thesis of the author F.A. El-Qawasma [45].Scopu
Pattern formation in urbanism: A critical reflection on urban morphology, planning and design
No full textThis thesis is all about urban patterns, what we see through the windows of the plane with an admiration of their relief-like scenery covering the land surface. In a sense, the spatial pattern within our cities is the biggest collectively produced artifact of human beings. It is both the originator and the result of human activity. It is not only a product, but also the process itself. In this regard, the research problematizes the notion of formation, rather than the form. Implying both the process of being structured and the internal arrangement of a product, formation is the main emphasis of the inquiry on urban patterns. With the double connotation of the term, the research is an attempt to reveal the main components of the form-logic (morphology), control (planning) and the creation (design) of collective urban patterns. On this basis, the author aims to construct a stronger theoretical link between urban morphology, planning and design, which indeed needs to be improved for their own disciplinary performance. While suggesting a comprehensive view, the research also aims to provide a critical insight on the issue by reflecting on the current state of art in the theory and practice. In that framework, the research firstly constructs a conceptual baseline by revisiting the fundamental categories of urban morphology, the basic types of collective urban form, and the mainstream approaches in urbanism. By this means, the multi-dimensional nature of the phenomenon, urban pattern formation is exposed. Based upon the conceptual framework defined in the introductory chapter, the research focuses on morphology, and tends to provide the baselines of the main approaches, analytical methods and the basic indicators in urban morphology. Then, the issue is re-examined in terms of planning as the other factor of urban pattern formation. Being a broad category, planning, in this context, is discussed through its major function of design control. To comprehend the regulative role of design control in the production of urban (morphological) coherence, the research conducts a comparative plan analysis of the cases of the planned residential developments in the UK, the Netherlands and Turkey. The international perspective constructed on planning is applied to the issue of design as well. Accordingly, in the consequent part, the research delineates the process of urban design by means of a comprehensive and a focussed analysis conducted on the actual projects by the fifteen designers from the three countries. In the light of the critical review made on the existing models in the literature and an alternative theoretical framework, the author ultimately suggests an updated view on design thinking in urbanism. Finally, the research provides future perspective on morphological design and planning through reviewing the emerging design methods and techniques. For this purpose, the method of parametric design is discussed with reference to ‘generative urbanism’ as the mainstream approach in urbanism. From that perspective, the actual use of the algorithmic models in urban design is critically evaluated in the context of a master planning application in Istanbul, Turkey. Relating all the intermediate conclusions of the previous discussions, a possible coalescence between morphology, planning and design, and its principles are argued in the conclusion through addressing the critical aspects of the central issue, pattern formation in urbanism.Urbanis
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