Miracle-dz/UniFAR-FTUs huggingface dataset:
802.11 markov channel modeling

In order to understand the behavior of upper layer protocols and to design or fine tune their parameters over wireless networks, it is common to assume that the underlying channel is a flat Rayleigh fading channel. Such channels are commonly modeled as finite state Markov chains. Recently, hidden Markov models have also been employed to characterize these channels. Although Markov models have been widely used to study the performance of communications protocols at the link and transport layers, no validation of their accuracy has been performed against experimental data. These models are not applicable to frequency selective fading channels. Moreover, there are no good models to consider the effects of path loss (average received SNR), the packet size, and transmission rate variations which are significant in IEEE 802.11 wireless local area networks. This research performs validation of Markov models with experimental data and discusses the limitations of the process. In this dissertation, we present different models that have been proposed along with their validity analysis. We use the experimental data with stochastic modeling approaches to characterize the frame losses in IEEE 802.11 wireless LANs. We also characterize the important factor of current wireless LAN technology, the transmission rate variations. New guidelines for the construction of Markov and hidden Markov models for wireless LAN channels are developed and presented along the necessary data to implement them in performance studies. Furthermore we also evaluate the validity of using Markovian models to understand the effects on upper layer protocols such as TCP.
A Computational Model of Syntactic Ambiguity as a Lexical Process

Abstract : The use of semantic information in language comprehension is a matter of controversy. We briefly review Frazier's modular serial parser and Altmann and Steedman's conceptually driven parser. We propose a third mode, based on the work of Tanenhaus and Carlson 1988, Tanenhaus et al. 1987, that accounts for the conflicting results of our model, and, based on the behavior of the network, make a number of empirical predictions.
A database system to support image algorithm evaluation, final technical report

The design is given of an interactive image database system IMDB, which allows the user to create, retrieve, store, display, and manipulate images through the facility of a high-level, interactive image query (IQ) language. The query language IQ permits the user to define false color functions, pixel value transformations, overlay functions, zoom functions, and windows. The user manipulates the images through generic functions. The user can direct images to display devices for visual and qualitative analysis. Image histograms and pixel value distributions can also be computed to obtain a quantitative analysis of images.
Les processus cognitifs et la rédaction de résumés

La comprehension en vue de la redaction implique l’identification des concepts essentiels d’un texte. Elle necessite l’interaction de processus intellectuels complexes. Les schemas intellectuels permettent aux individus d’encoder la realite les entourant et d’emmagasiner l’information percue. Des unites cognitives organisees telles les concepts, les propositions et les episodes representent des objets ou des evenements. Pour ce faire, les memoires a court terme et a long terme encodent cette information. Ces differentes structures cognitives sont activees lors de la lecture d’un texte et de la redaction de son resume. Le processus de « condensation » s’apparente a une chaine d’operations qui transforment le texte original en eliminant les informations superflues. Dans son modele pour la redaction de resumes, Pinto Molina (1995) considere, d’une part, les donnees textuelles, et d’autre part, les donnees documentaires a savoir le redacteur, les intentions de production et les demandes des utilisateurs, en somme le contexte de redaction.
Task sharing system for Craftsman

This thesis has been motivated by the file sharing systems that has become extremly popular since they emerged. The concept of these applications is to log in and share files from your computer with other people. This will allow you to search for files that other people are sharing and download them. Even if the intention of these applications may have been to share legal files over the Internet, it has lead to crime and serious issue for some industries. The motivation for this thesis has been to take the file sharing concept a step further and try to make use of the concept in a new way. A task sharing concept has been defined where companies and collaborators can share tasks with each other, and at the same time make their collaboration and commuication more efficient. The objectives of this project have been threefold. The first objective has been to look into the file sharing concept and the cooperative work research area. The second objective has been to define the task sharing concept with a user domain. This thesis has focused on the craftsman companies and their close collaboration with each other has been the main reason why they have been chosen as a user domain. A survey and interviews was required in order to discover their work processes to define the task sharing concept. The last objective has been to implement a system based on the task sharing concept. The task sharing system offers solutions for Web browsers, PDAs and WAP phones.
An Evaluation of NLP Toolkits for Information Quality Assessment

Documentation is often the first source, which can help user to solve problems or provide conditions of use of some product. That is why it should be clear and understandable. But what does “understandable” mean? And how to detect whether some text is unclear? And this thesis can answer on those questions.The main idea of current work is to measure clarity of the text information using natural language processing capabilities. There are three global steps to achieve this goal: to define criteria of bad clarity of text information, to evaluate different natural language toolkits and find suitable for us, and to implement a prototype system that, given a text, measures text clarity.Current thesis project is planned to be included to VizzAnalyzer (quality analysis tool, which processes information on structure level) and its main task is to perform a clarity analysis of text information extracted by VizzAnalyzer from different XML-files.
SEARCH FOR NONCIRCULAR SLIP SURFACES BY THE MORGENSTERN-PRICE METHOD. PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON NUMERICAL METHODS IN GEOMECHANICS, 11-15 APRIL 1988, INNSBRUCK, AUSTRIA. VOLUMES 1 - 3

Four techniques for solving optimization problems have been investigated to search for a general noncircular critical slip surface by using the Morgenstern and Price method. These techniques are the Nelder and Mead simplex method, the Powell, the DFP and the BFGS methods. In the present study the problem of slope stability has been formulated as a simple, yet versatile procedure for solving an optimization process. A computer program has been developed and its basic characteristics have been revealed by investigating various aspects of example problems. It is shown that for slopes consisting of inhomogeneous soils, an initial estimate for the optimization process plays a particularly important role. (Author/TRRL)
Spectrogramme de phase et spectrogramme de fréquence

La Transformee de Fourier a Court Terme (TFCT) livre une fonction de distribution complexe qui ne peut etre directement illustree dans le plan temps-frequence. Jusqu'a present, le resultat du calcul de la TFCT etait presente sous la forme d'un spectrogramme de puissance ou l'on n'exploite que la valeur d'amplitude de la TFCT. Le probleme est que l'information de phase y est partiellement presente et n'y est pas distinctement affichee. Nous nous coupons ainsi d'une source d'information importante. Entre autres, le spectrogramme de puissance ne permet pas de caracteriser des signaux harmoniques modules en phase ou faiblement modules en frequence. Nous presentons ici differents moyens de presenter et de mettre en valeur l'information provenant de la phase de la TFCT. Ces moyens, nous les appellerons spectrogramme de phase et spectrogramme de frequence, par opposition a spectrogramme d'amplitude ou de puissance. Des simulations numeriques, ainsi que des exemples tires de mesures de vibrations mecaniques, demontrent l'utilite et l'acuite de ces nouveaux outils. Ces algorithmes sont disponibles sur le site ftp.ireq. ca/pub/fleonard/.
L'alcoolisme et ses conséquences, une maladie orpheline

La consommation excessive d'alcool est l'un des plus grands fleaux de sante dans le monde. Ses consequences (morbidite et mortalite), induites par l'exces, sont en theorie "evitables". La politique des gouvernements vis-a-vis des abus de boisson repose sur l'education et la prevention, mais l'efficacite de ces strategies est moderee: en effet le pourcentage de personnes ayant un probleme d'alcool reste stable chez les adultes et a tendance c augmenter chez les jeunes. Le statut legal de l'alcool, sa libre circulation, sa disponibilite apparaissent indissociables des risques de surconsommation, cause de diverses pathologies. La recherche fondamentale, clinique et therapeutique sur l'alcoolodependance et les maladies liees a l'alcool est insuffisante au vu des enjeux de sante publique ; c'est pourtant la voie de choix pour acquerir les connaissances necessaires a l'ouverture de pistes therapeutiques vidant a reduire morbidite et mortalite.
The recursion method : application to many-body dynamics

In this monograph the recursion method is presented as a method for the analysis of dynamical properties of quantum and classical many-body systems in thermal equilibrium. Such properties are probed by many different experimental techniques used in materials science. Several representations and formulations of the recursion method are described in detail and documented with numerous examples, ranging from elementary illustrations for tutorial purposes to realistic models of interest in current research in the areas of spin dynamics and low-dimensional magnetism. The performance of the recursion method is calibrated by exact results in a number of benchmark tests and compared with the performance of other calculational techniques. The book addresses graduate students and researchers.
Narcissus Brainwave Artistic Visualisation of the Brainwaves of Meditators

6 Introduction . 7 Significance of Meditation . 7 Brainwave Studies . 7 Research Problem . 7 Research Question . 8 Outcomes and Contributions . 8 Literature review . 10 Meditation . 11 Eastern Body-mind theory . 13 Eastern Meditative Techniques in Buddhism . 14 Visual Patterns from Buddhist Meditation . 15 Benefits of Meditation . 17 Brainwaves . 19 Recent scientific research on brainwave . 20 Ways of visualisation (cognitive science and creative artworks) . 22 Brainwave audio-visualisation studies . 24 Methodology . 28 Zen Buddhism meditation . 30 EEG tool use in the research . 31 Terminology . 32 Preliminary study . 34 Summary of preliminary study . 40 User Study 1 . 42 Rules of visualisation . 47 Transition diagram (model 1) . 48 Inner experience during meditation . 50 Design process . 54 User Study 2 . 62 Evaluation questions . 62 Key elements . 64 Discernibility of pattern visualisation between non-meditators and meditators . 70
Development of L-Band Down Converter Boards and Real-Time Digital Backend for Phased Array Feeds

Development of L-Band Down Converter Boards and Real-time Digital Backend for Phased Array Feeds Vikas Asthana Department of Electrical and Computer Engineering Master of Science Recent developments in the field of phased array feeds for radio astronomical reflector antennas, have opened a new frontier for array signal processing for radio astronomy observations. The goal is to replace single horn feeds with a phased array feed, so as to enable astronomers to cover more sky area in less time. The development of digital backend signal processing systems has been a major area of concentration for the development of science-ready phased array feeds for radio astronomers. This thesis focuses on the development of analog down-converter receivers and an FPGAbased digital backend for real-time data processing and analysis support for phased array feeds. Experiments were conducted with new receiver boards and both single-polarization and dualpolarization phased array feeds at the Arecibo Observatory, Puerto Rico and at the 20-meter telescope at Green Bank, WV, and results were analyzed. The experiments were performed as a part of a feasibility study for phased array feeds. The new receiver boards were developed as an upgrade to the earlier connectorized receivers as the number of input channels increased from 19 to 38 and space constraints arose due to the large size of the earlier receivers. Each receiver card has four independent channels on it. The receiver cards were found to have lower cross-coupling between the channels in comparison to the earlier receivers. The development of a FPGA-based real time digital backend focused on a real-time spectrometer, beamformer and a correlator for all the 64-channels using a x64 ADC card and ROACH FPGA boards. The backend can plot results in real time and can stream and store the data on the computers for purpose of post-processing and data analysis. The design process uses libraries and blocks provided by the Center for Astronomy Signal Processing and Electronics Research (CASPER) community.
Multi-touch Interaction with Gesture Recognition

This master's thesis explores the world of multi-touch interaction with gesture recognition. The focus is on camera based multi-touch techniques, as these provide a new dimension to multi-touch with its ability to recognize objects. During the project, a multi-touch table based on the technology Diffused Surface Illumination has been built. In addition to building a table, a complete gesture recognition system has been implemented, and different gesture recognition algorithms have been successfully tested in a multi-touch environment. The goal with this table, and the accompanying gesture recognition system, is to create an open and affordable multi-touch solution, with the purpose of bringing multi-touch out to the masses. By doing this, more people will be able to enjoy the benefits of a more natural interaction with computers. In a larger perspective, multi-touch is just the beginning, and by adding additional modalities to our applications, such as speech recognition and full body tracking, a whole new level of computer interaction will be possible.
Automatic whole heart segmentation based on image registration

Whole heart segmentation can provide important morphological information of the heart, potentially enabling the development of new clinical applications and the planning and guidance of cardiac interventional procedures. This information can be extracted from medical images, such as these of magnetic resonance imaging (MRI), which is becoming a routine modality for the determination of cardiac morphology. Since manual delineation is labour intensive and subject to observer variation, it is highly desirable to develop an automatic method. However, automating the process is complicated by the large shape variation of the heart and limited quality of the data. The aim of this work is to develop an automatic and robust segmentation framework from cardiac MRI while overcoming these difficulties. The main challenge of this segmentation is initialisation of the substructures and inclusion of shape constraints. We propose the locally affine registration method (LARM) and the freeform deformations with adaptive control point status to tackle the challenge. They are applied to the atlas propagation based segmentation framework, where the multi-stage scheme is used to hierarchically increase the degree of freedom. In this segmentation framework, it is also needed to compute the inverse transformation for the LARM registration. Therefore, we propose a generic method, using Dynamic Resampling And distance Weighted interpolation (DRAW), for inverting dense displacements. The segmentation framework is validated on a clinical dataset which includes nine pathologies. To further improve the nonrigid registration against local intensity distortions in the images, we propose a generalised spatial information encoding scheme and the spatial information encoded mutual information (SIEMI) registration. SIEMI registration is applied to the segmentation framework to improve the accuracy. Furthermore, to demonstrate the general applicability of SIEMI registration, we apply it to the registration of cardiac MRI, brain MRI, and the contrast enhanced MRI of the liver. SIEMI registration is shown to perform well and achieve significantly better accuracy compared to the registration using normalised mutual information.
Adpects on colour rendering, colour prediction and colour control in printed media

This thesis work deals with analysis and development of methods to characterize colour rendering, to predict colour and to control colour in printed media. There is often a need to make an accurate assessment of the available colour gamut or the difference between a test print and a reference, whether it be an original, a proof or a given set of inks on different paper grades. It may also imply the comparison of different printing techniques. The process treated is the production of printed media, including the conventional printing represented by offset, digital proofing and different digital printing technologies. The work includes development of reliable methods to ensure that the degree of fidelity in the colour reproduction chain in graphic arts media can be satisfactorily assessed. The work is furthermore focused on development of methods for the characterization of crucial parameters that influence colour in the printing stage. This in turn implies the study and development of methods to assess the available colour gamut, methods for colour comparison, the analysis and understanding of how variations of techniques, materials, and process parameters in each process step influence colour. Since customers always judge the printed product at the end visually, it is crucial that technical measures developed are in accordance with the perceptional evaluations. Finally, the work deals with the relationship between measured quality factors and the mechanisms causing the variations in colour rendering. For the analysis of colour in a way that is relevant for the printing process a comprehensive test model for proofing based on densitometric and colorimetric measures is proposed. The relationship between technical measures and perceptional assessment also have to include several parameters in order to, in a more complete way, bear a resemblance to the comprehensiveness of the human vision. A test model based on crosswise use of ICC-profiles (an ICC profile in this case characterizes the colour performance of the printer or press) is developed for the evaluation of tolerances concerning the substrate. It is shown that even small deviations in inking level will cause considerable colour shifts. It is demonstrated that substrate parameters as paper surface roughness, paper whiteness and absorption can be used to characterize the influence of the substrate on colour rendering.
Numerical analysis of a fractional step theta-method for fluid flow problems

The accurate numerical approximation of viscoelastic fluid flow poses two difficulties: the large number of unknowns in the approximating algebraic system (corresponding to velocity, pressure, and stress), and the different mathematical types of the modeling equations. Specifically, the viscoelastic modeling equations have a hyperbolic constitutive equation coupled to a parabolic conservation of momentum equation. An appealing approximation approach is to use a fractional step θ-method. The θ-method is an operator splitting technique that may be used to decouple mathematical equations of different types as well as separate the updates of distinct modeling equation variables when modeling mixed systems of partial differential equations. In this work a fractional step θ-method is described and analyzed for the numerical computation of both the time dependent convection-diffusion equation and the time dependent equations of viscoelastic fluid flow using the Johnson-Segalman constitutive model. For convection-diffusion the θ-method presented allows for a decoupling within time steps of the parabolic diffusion operator from the hyperbolic convection operator. The hyperbolic convection update is stabilized using a Streamline Upwinded Petrov-Galerkin (SUPG)-method. The analysis given for the convection-diffusion equation serves as a template for the analysis of the more complicated viscoelastic fluid flow modeling equations. The θ-method implementation analyzed for the viscoelastic modeling equations allows the velocity and pressure approximations within time steps to be decoupled from the stress, reducing the number of unknowns resolved at each step of the method. Additionally the θ-method decoupling results in the approximation of the nonlinear viscoelastic modeling system using only the solution of linear systems of equations. Similar to the scheme implemented for convection-diffusion, the hyperbolic constitutive equation is stabilized using a SUPG-method. For both the convection-diffusion and the viscoelastic modeling equations a priori error estimates are established for their θ-method approximations. Numerical
Paralanguage: A linguistic and interdisciplinary approach to interactive speech and sounds

This is the first interdisciplinary book-length treatment of paralanguage, briefly defined as: nonverbal vocal or narial communication. After sensitizing the reader to our sound-generating movements and to all human external and environmental sounds for their unquestionable communicative qualities, it realistically combines an anatomical-physiological auditory approach to voice production (identifying many neglected articulations) with the analysis of its visual manifestations as the triple reality of speech: language-paralanguage-kinesics. The primary qualities of speech (loudness, pitch etc.) are extensively discussed, as are the many voice qualities. The longest chapter in the book deals with paralinguistic differentiators: laughter, crying, sighing, yawning, coughing, sneezing etc. Finally the author presents a model for analyzing paralinguistic alternants, word-like independent constructs (such as Pooh, Aah and Brrr). Throughout the discussion of these paralinguistic phenomena, extensive attention is given to cultural, social and psychological aspects. This first, ground-breaking interdisciplinary work on paralanguage will serve as a source of data and a theoretical/methodological model for phoneticians, linguists, anthropologists, sociologists, psychologists, speech therapists etc.
Game Theoretical Model Applied to Scheduling in Grid Computing

We consider a grid computational model which consi st of a number of computation nodes and a number of users. Each user generates a comput ation load (jobs) requesting computational and communication resources. A deadline for each job is also defined. We propose a scheduling algorithm which is based on Iterated Prisoner's Dil emma (IPD) under the Random Pairing game, where nodes (players) of the grid system decide abo ut their behavior: cooperate or defect. In this game players play a game with randomly chosen playe rs and receive payoffs. Each player has strategies which define its decision. Genetic algor ithm (GA) is used to evolve strategies to optimize a criterion related to scheduling problem. In this pa per we show that GA is able to discover a strategy in the IPD model providing a cooperation between no de-players, which permits to solve scheduling problem in grid.