Miracle-dz/UniFAR-FTUs huggingface dataset:
Improving Hoeffding Trees

Modern information technology allows information to be collected at a far greater rate than ever before. So fast, in fact, that the main problem is making sense of it all. Machine learning offers promise of a solution, but the field mainly focusses on achieving high accuracy when data supply is limited. While this has created sophisticated classification algorithms, many do not cope with increasing data set sizes. When the data set sizes get to a point where they could be considered to represent a continuous supply, or data stream, then incremental classification algorithms are required. In this setting, the effectiveness of an algorithm cannot simply be assessed by accuracy alone. Consideration needs to be given to the memory available to the algorithm and the speed at which data is processed in terms of both the time taken to predict the class of a new data sample and the time taken to include this sample in an incrementally updated classification model. The Hoeffding tree algorithm is a state-of-the-art method for inducing decision trees from data streams. The aim of this thesis is to improve this algorithm. To measure improvement, a comprehensive framework for evaluating the performance of data stream algorithms is developed. Within the framework memory size is fixed in order to simulate realistic application scenarios. In order to simulate continuous operation, classes of synthetic data are generated providing an evaluation on a large scale. Improvements to many aspects of the Hoeffding tree algorithm are demonstrated. First, a number of methods for handling continuous numeric features are compared. Second, tree prediction strategy is investigated to evaluate the utility of various methods. Finally, the possibility of improving accuracy using ensemble methods is explored. The experimental results provide meaningful comparisons of accuracy and processing speeds between different modifications of the Hoeffding tree algorithm under various memory limits. The study on numeric attributes demonstrates that sacrificing accuracy for space at the local level often results in improved global accuracy. The prediction strategy shown to perform best adaptively chooses between standard majority class and Naive Bayes prediction in the leaves. The ensemble method investigation shows that combining trees can be worthwhile, but only when sufficient memory is available, and improvement is less likely than in traditional machine learning. In particular, issues are encountered when applying the popular boosting method to streams.
Análisis de rendimiento de la transmisión de IPTV sobre ADSL, WiFi y LAN Extended

En este articulo se presenta una sintesis del estudio acerca del rendimiento del servicio de television sobre IP, implementado sobre distintas plataformas tecnologicas, tales como ADSL, WiFi y LAN Extended. Se presentan los resultados obtenidos y sus respectivos analisis referentes al retardo, jitter y perdida de paquetes en cada una de las plataformas, variando la tasa de transmision, el codec de video y la aplicacion de calidad de servicio. Por ultimo, se presenta un analisis comparativo entre las plataformas, definiendo la significancia de cada uno de los parametros de red variados con los parametros de rendimiento estudiados. Palabras clave: Rendimiento, perdida de paquetes, jitter, retardo, codec de Video, plataforma tecnologica, calidad de servicio, Sep Top Box, Sniffer.
Brutal Edges and Tender Surfaces: An Exhibition Arousing Gender-based Interpretations

In 1997, I installed a photographic exhibition in a gallery in the heart of the capital city of the United States. This exhibition, depicting, so I thought, lovingly rendered and abstracted black and white photographs of my husband, received critical reviews from gallery visitors whose interpretations differed from the documentary perspective that I had envisioned. For example, according to Oda (1997), a middle-aged male reviewer observed “[these] works convey a sense of male objectification, in which the act of covering or exposing the male torso feels like a submissive (rather than aggressive) act relative to the gaze of the artist/viewer. Thus does the artist wind up addressing gender issues” (p. 19). Oda’s published review postdated the reactions that I observed from a number of visitors during the opening reception. I observed with surprise, that most senior and middle-aged men appeared uncomfortable when they entered the gallery, or they changed directions and did not set foot beyond the front door. In fact, my father, in his early 70s, a man who owns a collection of works depicting nude women, has suggested on numerous occasions that I would be advised to remove one particular photograph of my husband, “Wing #1,” from our living room walls. (See Figure 1.) He recognizes that male nudity was important in ancient Greek and Roman times. But he believes that in modern art history, portrayals of female nudity are more frequent and thus, more accepted. Depictions of male nudes occur less frequently, and thus raise cultural concerns about their acceptability. After querying him, my father explained, “The recent attitude reflects a common feeling that it is not ‘manly’ for a man to have an interest in the male body (of others). And this, conceivably, may have its root in an unconscious concern that one might be considered homosexual if one were too interested in the depiction of other males. For example, Thomas Eakins did a number of paintings of male nudes, and even though Eakins was married it has been suggested that these paintings reflect a homosexual tendency on his part” (R. Basseches, personal communication, March 22, 2006). In further discussion, my father wondered, “Do younger men have the same reaction, or have the mores changed in this regard? ”
Streaming XML Transformation Using Term Rewriting.

This paper describes XStream, a Turing-complete programming language which allows the programmer to write XML transformations in a functional tree-processing style and have them evaluated in a streaming way: the output is produced incrementally while the input is still being parsed. The programmer does not need to care explicitly about buffering. We introduce the language, describe some techniques used in the implementation and present some performance results.
Dynamic Protocol Reverse Engineering: A Grammatical Inference Approach

Abstract : Round trip engineering of software from source code and reverse engineering of software from binary files have both been extensively studied and the state-of-practice have documented tools and techniques. Forward engineering of protocols has also been extensively studied and there are firmly established techniques for generating correct protocols. While observation of protocol behavior for performance testing has been studied and techniques established, reverse engineering of protocol control flow from observations of protocol behavior has not received the same level of attention. State-of-practice in reverse engineering the control flow of computer network protocols is comprised of mostly ad hoc approaches. We examine state-of-practice tools and techniques used in three open source projects: Pidgin, Samba, and rdesktop. We examine techniques proposed by computational learning researchers for grammatical inference. We propose to extend the state-of-art by inferring protocol control flow using grammatical inference inspired techniques to reverse engineer automata representations from captured data flows. We present evidence that grammatical inference is applicable to the problem domain under consideration.
DOUBLY PENALIZED LOGISTIC REGRESSION FOR GENOMEWIDE ASSOCIATION STUDIES WITH LINEARLY STRUCTURED GENETIC NETWORKS

Title of thesis: DOUBLY PENALIZED LOGISTIC REGRESSION FOR GENOMEWIDE ASSOCIATION STUDIES WITH LINEARLY STRUCTURED GENETIC NETWORKS Xia Li, Master of Public Health, 2012 Directed by: Assistant Professor Tongtong Wu Department of Epidemiology and Biostatistics This research aims to integrate linear structures of genetic networks into genomewide analysis studies (GWAS). Lasso penalized logistic regression is ideally suited for continuous model selection in case-control disease gene mapping, especially when the number of predictor variables far exceeds the number of observations. But it fails to consider the structure of genetic networks. Imposing an additional weighted fused lasso can further remove irrelevant predictors. Nesterov’s method is employed to handle the high dimensionality and complexity of genetic data. It also resolves the non-differentiability problem of the lasso and fused lasso penalties. In simulation studies, this proposed method shows advantages in some cases compared with lasso and fused lasso. We apply this method to the coeliac data on chromosome 8. DOUBLY PENALIZED LOGISTIC REGRESSION FOR GENOMEWIDE ASSOCIATION STUDIES WITH LINEARLY STRUCTURED GENETIC NETWORKS By Xia Li Thesis submitted to the Faculty of the Graduate School of the University of Maryland, College Park, in partial fulfillment of the requirements for the degree of Master of Public Health 2012 Advisory Committee: Assistant Professor Tongtong Wu, Chair Assistant Professor Guangyu Zhang Associate Professor Paul J. Smith c © Copyright by Xia Li 2012 Table of
Constructing Meaning in a Classroom Context.

Current theory posits that comprehension and meaning involve not only text but also what the reader brings to the text and the contextual elements of the reading. A study investigated hoF eight students in grade 9 read and created meaning from short story assignments in their English classrooms. Concurrent think-aloud protocols from four short story readings were the primary data source, and these were supplemented by classroom observations and three interviews. The tea-her also participated in three interviews. Results indicated that stadents used their experiences with written texts, personal texts, and sociocultural texts to create meaning for assignments given in this classroom context. These texts formed the basis of the coding system and included some overlapping codes for those responses drawing upon several textualizations. Classroom influences in the form of intertextual substances and processes related to which texts readers selected and used in their short story readings. In addition to these classroOm elements, individual reading styles also were represented in the protocols. Findings suggest that communities, whether classroom, social, or cultural, influence not only the construction of texts but also how those texts are used by members of these groups to create meaning. (Contains 16 references.)
The True Picture: Creative Writing and Critical Thinking on Saint Veronica’s Cloth

Abstract The True Picture is a new novel based on the myth of Saint Veronica, who is not mentioned in the Bible but appears at the sixth Station of the Cross in Catholic churches as the woman of Jerusalem who wipes Christ’s face with her cloth. I chose to make her Roman, not Jewish, partly because of her name: Vera Icon is Latin for true image. Roman women did not cover their elaborate hairstyles with veils but did carry luxury linen handkerchiefs called sudarium. In this article, I discuss the creative process behind my fictional character of Veronica, conceived as a rich businesswoman working in the purple dye trade in ancient Tyre, who gives up her possessions to follow Jesus. In reconstructing her journey through Galilee to Judaea, around 33 AD, I discovered fascinating research into the different shades of royal purple and biblical blue produced by the same murex sea snails, and the different techniques of dyeing in Phoenician and Jewish traditions. Here, I describe how this background reading informed my novel’s plotline, imagery, and historical authenticity.
Implementación de Oracle public cloud architecture aplicada a la gestión de catálogo de productos

El presente articulo tiene como objetivo definir la implementacion de Oracle Public Cloud Architecture aplicado a la gestion de catalogo de productos. El proposito de este sistema es la parametrizacion de productos y articulos asi como la generacion de pedidos. El sistema cuenta con un modulo de seguridad que emplea un directorio LDAP, sobre el servidor de aplicaciones Oracle Weblogic 11g, para la administracion de usuarios y contrasenas. En base a los requerimientos funcionales y de arquitectura, se acoplaron las metodologias Programacion Extrema y Metodo Unificado Oracle, obteniendo una mayor rapidez en la codificacion como beneficio principal de la Programacion Extrema, asi como el entendimiento del negocio y la retroalimentacion de informacion de desarrollo por parte de Metodo Unificado Oracle.
ixi lang: A Constraint System for Live Coding

This paper explores the creation of constraints in digital musical systems as exemplified and implemented in the ixi lang live coding system. Constraints are here seen as limitations that enable the musician to encapsulate a specific search space (Boden 1990) of musical gestures, proscribing complexity in favor of simple set of rules that can be engaged with creatively. The reason for such constraints are twofold: to save time as musical performance is typically a real-time process and to ease the cognitive load of the performer. The presentation will present the ixi lang and the specific design rationale behind this system, as well as other constraint computer music systems.
LiFTinG: Lightweight Freerider-Tracking Protocol in Gossip

This report presents LiFTinG, the first protocol to detect freeriders, including colluding ones, in gossip-based content dissemination systems with asymmetric data exchanges. LiFTinG relies on nodes tracking abnormal behaviors by cross-checking the history of their previous interactions, and exploits the fact that nodes pick neighbors at random to prevent colluding nodes from covering up each others' bad actions. We present a methodology to set the parameters of LiFTinG based on a theoretical analysis. In addition to simulations, we report on the deployment of LiFTinG on PlanetLab. In a 300-node system, where a stream of 674 kbps is broadcast, LiFTinG incurs a maximum overhead of only 8% while providing good results: for instance, with 10% of freeriders decreasing their contribution by 30%, LiFTinG detects 86% of the freeriders after only 30 seconds and wrongfully expels only a few honest nodes.
Interdicting Electrical Power Grids

Abstract : This thesis explores Benders decomposition for solving interdiction problems on electric power grids, with applications to analyzing the vulnerability of such grids to terrorist attacks We refine and extend some existing optimization models and algorithms and demonstrate the value of our techniques using standard reliability test networks from IEEE Our implementation of Benders decomposition optimally solves any problem instance, in theory However, run times increase as Benders' cuts are added to the master problem, and this has prompted additional research to increase the decomposition's efficiency We demonstrate empirical speed ups by dropping slack cuts, solving a relaxed master problem in some iterations, and using integer but not necessarily optimal master-problem solutions These mixed strategies drastically reduce computation times For example, in one test case, we reduce the optimality gap, and the time that it takes to achieve this gap, from 16% in 75 hours to 5% in 16 minutes.
Neurosciences et éthique : que nous apprend le dilemme du wagon fou ?

Resume : L'ethique normative contemporaine est marquee par un debat entre deux positions antagonistes, le deontologisme et l'utilitarisme. Ce debat est reste jusqu'a recemment un debat usant d'arguments, d'objections, de contre-exemples et d'experiences de pensee essentiellement conceptuels. Il y a peu cependant, dans la foulee des progres de l'imagerie cerebrale, Joshua Greene y a introduit des elements empiriques : proposant a des sujets differents dilemmes, dont le dilemme du wagon fou (trolley problem), il a examine comment leur cerveau reagissait. Il en a tire la conclusion que le deontologisme s'appuyait sur des reponses emotionnelles, alors que l'utilitarisme utilisait des circuits rationnels, ce qui assurait a ce dernier une meilleure pertinence morale. Les raisons deontologistes seraient meme des rationalisations a posteriori, voire des confabulations. Malheureusement, si le recours a des donnees empiriques est un progres philosophique dans l'examen de ces questions, les consequences que Greene en tire ne sont a mon sens pas probantes Abstract : Contemporary normative ethics is characterized by a debate between two conflicting theories, deontologism and utilitarianism. Until recently, this debate has essentially used arguments, objections and thought-experiments of a conceptual nature. Following the progress in neuroimagery, Joshua Greene has introduced empirical elements in the discussion : submitting several subjects to different dilemmas, in particular the trolley problem, he has examined how their brain were reacting. He concluded that deontologists were drawing on their emotions, whereas utilitarians reacted more rationally, and therefore gave a better answer from a moral point of view. Deontologists reasons are even rationalizations and confabulations, rather than authentic moral reasons. Unfortunately, if Greene is on the right track in introducing empirical data in this debate, his conclusions are not warranted in my opinion.
The Visual Representation of the Physical Space through Stereoscopic S3D Documentary

In 1987 I began my academic activities as a film researcher and documentary filmmaker. Since 2003 I have been researching the subject of stereoscopic film (S3D [1] ), as much from a technological point of view and from the point of view of the audiovisual language. The interest in documentary films led the author to experiment with various techniques of stereoscopic filming, as well as analyze various documentary films in both 2D and S3D. The S3D film technology that uses two synchronized cameras has been competing with technology that uses a single camera with two lenses and two sensors. The heavy weight and large size of the two-camera technology complicates the mobility and agility of the documentary film language. This paper intends to investigate theoretical issues related to the use of these technologies in filming S3D documentaries and its immersive function. The current stage of the two-camera technology implies a setback in the film methods that have been enhanced from the experience of the American Direct Cinema and French Cinema Verite, with strong implications on the film language. [1] The acronym S3D or Stereo 3D, is used to represent the stereoscopic system, thus avoiding confusion with the 3D images produced by computer modeling of three-dimensional environment, which are mostly two-dimensional.
Operator Workload: Comprehensive Review and Evaluation of Operator Workload Methodologies

Abstract : This report documents the results of an analysis of the scientific literature on operator workload. It begins with an extensive discussion of the concept and definitions of operator workload. The main body of the report is a review and analysis of techniques that have been used for assessing operator workload. These techniques are classified into two broad categories: a) analytical or predictive techniques that may be applied early in system design, and b) empirical or evaluative techniques that must be obtained with an operator-in-the-loop during simulator, prototype, or system evaluations. Information from the review provides practical guidance for selecting the most appropriate techniques for various system and resource characteristics. Keywords: Workload; Human performance; MANPRINT(Manpower and Personnel Integration); Man machine relations; Measurements.
Effecten van individuele HRM-domeinen op de financiële resultaten van een bedrijf: een onderzoek in Belgische KMO's

Het onderzoek naar de relatie tussen HRM en performantie is de laatste jaren sterk toegenomen. De aandacht ging daarbij voornamelijk uit naar grote bedrijven. In deze bijdrage willen we nagaan of het investeren in HRM ook rendeert in kleinere organisaties. Meer bepaald willen we onderzoeken 'welke' HRM-domeinen toegevoegde waarde creeren in KMO's en vervolgens vergelijken 'hoe' hun invloed op de financiele performantie juist verloopt. Om deze bedrijfsperformantie te meten, hanteren we maatstaven die sterk aansluiten bij de leefwereld van KMO's. Uit de resultaten mogen we concluderen dat een intensief opleidings-, belonings-, beoordelings- en participatiebeleid - zij het op verschillende manieren - ook in KMO's een meerwaarde creeren. Elk van de eerste drie genoemde HRM domeinen hebben een direct positief effect op de rendabiliteit. Voor participatie hebben we eerder indicaties van een indirect positief effect op de productiviteit, via een verlaging van het vrijwillig verloop.
La motivation des usagers à participer sur Facebook : étude de la promotion numérique du festival Coup de coeur francophone

Ce memoire porte sur la caracterisation des usages mediatiques a l'ere du Web 2.0. Plus specifiquement, il traite de la participation des usagers a la page Facebook d'un festival de musique francophone quebecois. Nous nous attachons ainsi a determiner les motifs dont resulte la participation des individus aux festivals, mais aussi a mettre en avant les « nouveautes » liees a l'emergence du Web social et des medias socionumeriques dans le paysage mediaticoculturel. De la problematisation de notre objet d'etude decoule une question generale : au-dela des raisons qui poussent les publics a participer physiquement a un evenement culturel annonce comme un festival, quelles sont les motivations des internautes a participer a sa promotion sur les reseaux socionumeriques comme Facebook? Afin d'y repondre, nous mobilisons le concept de predominance des usages et des satisfactions (theorie des uses and gratifications) dont emane la consommation mediatique. Notre recherche consiste en une etude de cas de la participation des usagers sur la page d'une organisation culturelle : le festival quebecois Coup de cœur francophone. Nous adoptons une strategie de recherche mixte sequentielle explicative a predominance quantitative reposant sur 1) une etude de contenu des commentaires laisses par les participants sur la page Facebook de ce festival et 2) une serie d'entretiens individuels nous permettant de preciser et d'eclairer les resultats. Finalement, nous observons que les usagers participent sur la page Facebook du festival afin d'obtenir de l'information ou pour se divertir, mais qu'ils ne s'impliquent pas ou s'impliquent peu sur ces memes pages. Nous montrons ainsi que la creativite des usagers sur cette page est relativement limitee : il en ressort une participation principalement factuelle et peu creative. Enfin, nous proposons au lecteur des pistes de reflexion visant a approfondir la connaissance de l'objet d'etude. ______________________________________________________________________________ MOTS-CLES DE L’AUTEUR : festivals, reseaux socionumeriques, participation, usages, gratifications