Global ETD Search

241	Machine learning and Neural networks in Fake news detection : A mapping study / Maskininlärning och neurala nätverk inom fake news-detektion : En kartläggning Kudryk, Theodor, Lindh, Astrid January 2022 (has links) Fake news, or information disorder, is a societal problem that could be partially remedied by automatic detection tools. While still a young research field many such tools have been proposed in academic writing. This systematic mapping study gives an overview of the current research in Natural Language Process-based fake news detection utilising Machine Learning and Neural Network classification algorithms in regards to which classification algorithms have been studied and which datasets have been used. Furthermore, we attempt to make a generalised description of the performance (measured in f-score and accuracy) of the most commonly occurring classification algorithms. From a corpus of 124 research articles and other scientific texts we identify 63 different datasets mainly written in English, and 116 different classification algorithms. The seven most commonly occurring algorithms (Random Forest, Logistic Regression, Support Vector Machine, Decision Tree, Long Short- TermMemory, K-Nearest Neighbors, Convolutional Neural Network) together make up almost 50% of all algorithm occurences in the article corpus. For these seven, the ten occurrences with the best performance are listed. Out of the datasets, the six most common datasets (ISOT, FakeNewsNet, Patwa 2021, LIAR, Bisaillon, and UTK-MLC) together make up 44% of all dataset occurrences. Apart from English, the represented languages were mainly Chinese (Mandarin), Portugese, Indonesian, Bangla, and Albanian. / Olika typer av desinformation (så kallade fake news), är ett problem för dagens samhälle. En av flera möjliga dellösningar på problemet utgörs av automatiserad fake news-detektion. Trots att detta forskningsfält är relativt nytt finns det en uppsjö av olika föreslagna modeller för automatiserad fake news-detektion. Denna systematiska kartläggning syftar till att ge en överblick över den aktuella forskningen inom Natural Language Processing-baserad automatiserad fake news-detektion med klassifikationsalgoritmer både inom maskininlärning och neurala nätverk. Översikten avser vilka klassifikationsalgoritmer samt vilka dataset som förekommer inom forskningen. Vidare försöker vi göra en generell beskrivning av prestandan hos de vanligast förekommande klassifikationsalgoritmerna, mätt i accuracy och f-score. Kartläggningen omfattar en samling på 124 artiklar och andra vetenskapliga texter, ur vilka vi identifierade 63 förekommance dataset och 116 olika förekommande klassifikationsalgoritmer. De sju vanligast förekommande algoritmerna (Random Forest, Logistic Regression, Support Vector Machine, Decision Tree, Long-Short Memory Network, K-Nearest Neighbors, Convolutional Neural Network) utgör tillsammans 49% av alla förekomster inom artikelsamlingen. Vi har tagit ut santliga förekomster av prestandaresultat för dessa sju algoritmer, och listat de tio bästa prestandaresultaten för var och en av de sju algoritmerna. De sex vanligast förekommande dataseten (ISOT, FakeNewsNet, Patwa 2021, LIAR, Bisaillon, and UTK-MLC) utgör tillsammans 44% av alla förekomster. Engelska var med stor marginal det vanligast förekommande språket inom dataseten, andra språk som förekom var kinesiska (mandarin), portugisiska, indonesiska, bangla, och albanska. Fake news Information disorder Detection Disinformation Natural Lan-guage Processing Machine Learning Neural Networks Fake news Desinformation Detektion Natural Language Processing Maskininlärning Neurala Nätver Computer and Information Sciences Data- och informationsvetenskap
242	Inférences dans les modèles ARCH : tests localement asymptotiquement optimaux / Inference in ARCH models : asymptotically optimal local tests Lounis, Tewfik 16 November 2015 (has links) L'objectif de cette thèse est la construction des tests localement et asymptotiquement optimaux. Le problème traité concerne un modèle qui contient une large classe de modèles de séries chronologiques. La propriété de la normalité asymptotique locale (LAN) est l'outil fondamental utilisé dans nos travaux de recherches. Une application de nos travaux en finance est proposée / The purpose of this phD thesis is the construction of alocally asymptotically optimal tests. In this testing problem, the considered model contains a large class of time series models. LAN property was the fundamental tools in our research works. Our results are applied in financial area Contiguïté Modèles ARCH Normalité asymptotique locale (LAN) Optimalité Suites centrales Statistique de Neyman-Pearson Troisième Lemme de Le Cam Tests Autoregressif models ARCH models Contiguity Discrete estimates Le Cam third Lemma Optimality Statistics of Neyman-Pearson Tests 519.56 330.015 195
243	Information Technology Application on Customer Relationship Management for Steel Industry, an example of Sheng Yu Steel Co., Ltd. Huang, Nelson 18 April 2001 (has links) The procedures of the study are mainly through the review on the relevant reference documents related to the subject of those have been published domestically and internationally, meanwhile to get a better understanding on the most recent development on Information Technology and its associated models which are being applied to the customer relationship management by the organizations and/or business units in the world. Then, through the investigation and review on steel industries to understand the real situations domestically and internationally, specifically to focus on the Sheng Yu Steel Co., Ltd. As an example, for which to plan the implementation of Extranet System for the improvement of Customer Relationship Management (CRM) by using Information Technology, what problems it will be faced and how is the best strategyfor this implementation. Then after the completion of the study, to make a constructive recommendation to the Sheng Yu Steel Co., Ltd as an useful reference when the Extranet system to be planned and implementedfor. In Chapter-1 ¡©Introduction¡ª¡Ato descibe the backgroud, purposes, procedures and the limitation related to the study¡Fin Chapter-2, the major is concentrate on the review and understand on the relevant documents of the subject related¡Fin Chapter-3, specifically to focus on the existing situations of the steel industries and the Sheng Yu Steel Co., Ltd. how it is the current situation to the subject issue¡Fin Chapter-4, to have further investigation on recent situations for the use of Information Technology in Sheng Yu Steel Co., Ltd. to make a recommendation for their reference whn they plan for the implementation of Extranet System for the improvement of Customer Relationship Management¡Fand finally, in Chapter-5, to describe the findings and issues for whicht to be expected to have further study in the future to come up a generalized model for which can be applied to all companies not only for steel industies but also to all conventional enpterprises as an important and valuable reference guideline. Inter-Organization System¡]IOS¡^ Customer Relationship Management¡]CRM) Customer Loyalty Intranet Information Technology¡]IT¡^ Internet Extranet Electronic Commerce¡]EC¡^ Data Base Marketing Customer Value Management¡]CVM¡^ Local Area Network¡]LAN¡^ Network Marketing One-to-One Marketing Relationship Marketing Transaction Marketing Wide Area Network¡]WAN¡^ Web DM.
244	Systém Hefaistos / The Hefaistos System Mancl, Vlastimil January 2019 (has links) This master's thesis describes functionality and principle of the Hefaistos measurement system, which is fully automated and modular. Its purpose is to measure frequency responses of materials and its temperature dependence. The thesis describes all the necessary parts of the modular measurement system. Main part of this system is the control application programmed in LabVIEW software environment. Another necessary parts are impedance analyzers for acquiring frequency dependencies and heating chambers for heating measured materials. The control application ensures hardware synchronization between impedance analyzers and heating chambers. Together they create the Hefaistos system. Modularity of the system means that a user may choose which instrument combination will be used. The system offers choice between three impedance analyzers Agilent 4294A, Wayne Kerr 6520B and HIOKI 3532 LCR Hi-Tester and two heating chambers AOIP GEMINI 700 LRI and AOIP HYPERION. Possibilities of the Hefaistos system are demonstrated on the results of an example measurement.
245	Changing from the silo model to the horizontal layers model in public policy regulations: the implications and potential for the telecommunications industry Spencer Logan, Lemuella C. 12 1900 (has links) The end of the Twentieth Century and the start of the Twenty First Century has been a tumultuous time for the Telecommunications Industry. Even as it moves forward to embrace the new technologies the Industry finds itself embroiled in issues of governance. The Industry finds itself in a dilemma since innovations increase at a rate faster than the laws can be changed and these render its existing laws and policies to be in some cases obsolete and inappropriate for the reality of the present. In the past, the United States of America has relied on vertically integrated top down laws and methods of regulating all the different parts in its Telecommunications Industry. These laws are contained in the different numbered Titles of this Countrys Legal Codes. Since the inception of these laws, emphasis was placed in creating and documenting policies structured by industry, sector and type of content. This form of regulation is usually referred to as the Silo Method. However, in recent years, especially in the regulation of the Telephony industry, the method of law and rule formulation moved from content regulation to one in which the technologies are getting regulated in what has been described as a Layers Method. This paper first considered whether the Silo Method of regulation is in actuality the same as using the Horizontal Layers method and showed that this is the case. Then it determined that Enhanced Services are the same as Basic Services and that Telecommunications Services are the same as Information services and showed that given that the pair sets as noted were the same, it went on to conclude that all these services were essentially the same. While studying to some detail the technologies of VoIP, the paper also showed that VoIP although an Internet technology is similar to traditional telephony, and is both a Telecommunications Service and Information Service based on the definition as given in the law as well as the technologies that are used and that as a result of this, the current regulatory environment for this service with regards to telephony is inconsistent. It concluded that Telecommunications policies though now adequate may need to be modified. Telecommunication/Internet Issues Telecommunications regulations Cable networks Cellular networks Common carriers Competitive carriers Computer inquiries Convergence Deregulation Digital networks FCC Federal Communications Commission Fiber optics Gatekeepers Gateways H.323 Horizontal Layers Model ICANN ILECs Information services Intelligent Network Architecture ISDN LAN LECs Loops LRN Call Flow MAN Network speed Networks NTIA OSI Model OSS Packet networks Packet switches Policies Protocols PSTN Networks PUCs Regulation SIP Spam SPY ACT Switched networks TC/IP Protocol Telecommunications Act of 1996 Telecommunications regulations Unbundled access UNCTAD UNICITRAL Vertical Silo Model VoIP VPN WAN Wireless Telecommunication Law and legislation Telecommunication Law and legislation
246	Implementation and Analysis of Co-Located Virtual Reality for Scientific Data Visualization Jordan M McGraw (8803076) 07 May 2020 (has links) <div>Advancements in virtual reality (VR) technologies have led to overwhelming critique and acclaim in recent years. Academic researchers have already begun to take advantage of these immersive technologies across all manner of settings. Using immersive technologies, educators are able to more easily interpret complex information with students and colleagues. Despite the advantages these technologies bring, some drawbacks still remain. One particular drawback is the difficulty of engaging in immersive environments with others in a shared physical space (i.e., with a shared virtual environment). A common strategy for improving collaborative data exploration has been to use technological substitutions to make distant users feel they are collaborating in the same space. This research, however, is focused on how virtual reality can be used to build upon real-world interactions which take place in the same physical space (i.e., collaborative, co-located, multi-user virtual reality).</div><div><br></div><div>In this study we address two primary dimensions of collaborative data visualization and analysis as follows: [1] we detail the implementation of a novel co-located VR hardware and software system, [2] we conduct a formal user experience study of the novel system using the NASA Task Load Index (Hart, 1986) and introduce the Modified User Experience Inventory, a new user study inventory based upon the Unified User Experience Inventory, (Tcha-Tokey, Christmann, Loup-Escande, Richir, 2016) to empirically observe the dependent measures of Workload, Presence, Engagement, Consequence, and Immersion. A total of 77 participants volunteered to join a demonstration of this technology at Purdue University. In groups ranging from two to four, participants shared a co-located virtual environment built to visualize point cloud measurements of exploded supernovae. This study is not experimental but observational. We found there to be moderately high levels of user experience and moderate levels of workload demand in our results. We describe the implementation of the software platform and present user reactions to the technology that was created. These are described in detail within this manuscript.</div> Software Engineering Computer Software Computer Graphics Simulation and Modelling Virtual Reality and Related Simulation Mobile Technologies Networking and Communications Computer-Human Interaction Collaborative Virtual Reality Virtual Reality Collaborative Virtual Reality Networking Networked VR Mulitplayer Multiplayer VR Data Visualization Data Exploration Head Mounted Display Cyberspace Augmented Reality Emerging Technologies Consumer Devices Virtual Environment Virtual Aesthetics Collaborative VR Simulation Training Simulation and Training Colocated Colocated Virtual Environment Immersive Media Immersive Technology Collaborative Tools Educational Virtual Environment Point Cloud Representations Isosurface Representations Mesh Smoothng Supernova Supernovae Supernova Remnant Modeling Astronomy and Astrophysics Cassiopeia N132D E0102 Crab Nebula CAVE CAVE Theater Mobile VR Virtual Classrooms STEM Workload Workload Assessment Tool Presence Engagement Immersion Experience Consequence Simulator sickness Simulator Sickness Questionnaire NASA TLX NASA Task Load Index Unified User Experience Quesionnaire Modified User Experience Questionnaire Oculus Oculus Go Oculus Quest Novel Solutions Optitrack Motive Motion Capture Mocap User Experience Unity3D Game Engine Lidgren Room Scale VR Hall Scale VR Co-location Colocation Virtual Training Collaborative Virtual Environments Shared Virtual Environments Collaboration Whiteboard Mobile Virtual Reality VR HMD LAN UX CSCL UXQ TLX AR VE CVE 3D UI EVE

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