220 research outputs found
Automatic bug triaging techniques using machine learning and stack traces
When a software system crashes, users have the option to report the crash using automated bug tracking systems. These tools capture software crash and failure data (e.g., stack traces, memory dumps, etc.) from end-users. These data are sent in the form of bug (crash) reports to the software development teams to uncover the causes of the crash and provide adequate fixes. The reports are first assessed (usually in a semi-automatic way) by a group of software analysts, known as triagers. Triagers assign priority to the bugs and redirect them to the software development teams in order to provide fixes.
The triaging process, however, is usually very challenging. The problem is that many of these reports are caused by similar faults. Studies have shown that one way to improve the bug triaging process is to detect automatically duplicate (or similar) reports. This way, triagers would not need to spend time on reports caused by faults that have already been handled. Another issue is related to the prioritization of bug reports. Triagers often rely on the information provided by the customers (the report submitters) to prioritize bug reports. However, this task can be quite tedious and requires tool support. Next, triagers route the bug report to the responsible development team based on the subsystem, which caused the crash. Since having knowledge of all the subsystems of an ever-evolving industrial system is impractical, having a tool to automatically identify defective subsystems can significantly reduce the manual bug triaging effort.
The main goal of this research is to investigate techniques and tools to help triagers process bug reports. We start by studying the effect of the presence of stack traces in analyzing bug reports. Next, we present a framework to help triagers in each step of the bug triaging process. We propose a new and scalable method to automatically detect duplicate bug reports using stack traces and bug report categorical features. We then propose a novel approach for predicting bug severity using stack traces and categorical features, and finally, we discuss a new method for predicting faulty product and component fields of bug reports.
We evaluate the effectiveness of our techniques using bug reports from two large open-source systems. Our results show that stack traces and machine learning methods can be used to automate the bug triaging process, and hence increase the productivity of bug triagers, while reducing costs and efforts associated with manual triaging of bug reports
âFrances Burney's Legacy Duty Accountâ (1840)
In the twelfth and final volume of The Journals and Letters of Fanny Burney, Joyce Hemlow published, for the first time, a transcription of the will of Frances Burney dâArblay (1752â1840), dated 6 March 1839 and proved on 17 February 1840, six weeks after her death.1 The will provides much valuable information on Burneyâs final intentions for the disposal of her effects, including her vast horde of manuscripts, as well as on the state of her finances. Unknown to Hemlow or to subsequent scholars, however, another key document in the National Archives throws new light on these matters: âBurneyâs Legacy Duty Account,â dated 19 October 1840, thanks to which we now have complete information about her finances at the time of her death.2 Of particular interest are its valuations of Burneyâs literary manuscripts and correspondence, as well those of her father, the music historian and man of letters Dr. Charles Burney (1726â1814). As well as transcribing the âLegacy Duty Accountâ below, we shall consider why the Burneys received valuations for their manuscripts that are not only shockingly low from a modern perspective, but also significantly lower than those of several of their literary contemporaries
Contribution à l'étude quantique du carbure de tungstÚne neutre (WC) et ionisé (WCq+, q=1, 2)
Metal carbides and oxides are more interesting in catalytic and industrial domains. Tungsten carbide WC has been detected as serious substituent of platinum Pt catalytic. The ultimate goal of this thesis is theoretical studies of electronic structure, stability and the bound nature on WC, WO and its cations. Our preliminary research were motiving by the available spectroscopic data on W, W+, W2+, WC et WC2+. We used the methodology (CASSCF/MRCI/MRCI+Q/aug-cc-pV5Z(-PP)) implemented on MOLPRO package to perform quantum calculations with high accuracy taking into account the correlation and relativistic effects with a specific treatment of spin orbit coupling for some low lying excited electronic states of WCn+, (n=0, 1 et 2). Our results are shown in good agreement with those available in the literature. Furthermore, in this work for the first time we demonstrated that a carbide dication (WC2+) is thermodynamically stableLes carbures et oxydes des mĂ©taux de transition sont d'une importance capitale dans le domaine industriel voir catalytique. Le carbure de tungstĂšne WC a Ă©tĂ© identifiĂ© comme un bon substituant des mĂ©taux nobles tel que le platine dans le domaine catalytique. Le but de ce travail de thĂšse est d'appliquer des mĂ©thodes de chimie quantique les plus poussĂ©es pour dĂ©terminer la structure Ă©lectronique, la stabilitĂ© et la nature de liaison chimique des diatomiques WC et WC2+. Notre recherche prĂ©liminaire est motivĂ©e par les donnĂ©es spectroscopiques disponibles sur W, W+, W2+, WC et WC2+. La mĂ©thodologie adoptĂ©e, CASSCF/MRCI/MRCI+Q/aug-cc-pV5Z(-PP) implĂ©mentĂ©e dans le code MOLPRO, consiste Ă rĂ©aliser des calculs quantique tenant en compte des effets de corrĂ©lation et relativistes avec un traitement spĂ©cifique du couplage spinâorbite pour la recherche des courbes d'Ă©nergie potentielle de l'Ă©tat fondamental et des Ă©tats excitĂ©s de plus basses Ă©nergies de WCn+ (n=0-2) tout en utilisant une base suffisamment Ă©tendue. Les rĂ©sultats de ce travail sont en bon accord avec ceux disponibles dans la littĂ©rature. En outre, dans ce travail nous avons confirmĂ© pour la premiĂšre fois que le carbure diatomique dicationique WC2+ est thermodynamiquement stabl
LâamĂ©ricanitĂ© comme motif identitaire suivi du rĂ©cit : Le gros Ă©ther
Ce mĂ©moire en crĂ©ation littĂ©raire porte sur le concept dâamĂ©ricanitĂ© et sur le sens quâil peut prendre pour un Ă©crivain dâaujourdâhui. Dans la partie thĂ©orique, je donne une vue dâensemble de lâamĂ©ricanitĂ©, que je dĂ©finis ici comme une posture ou un questionnement propre Ă celui qui tente de mettre en mots une rĂ©alitĂ© amĂ©ricaine. Elle concerne le rapport singulier au territoire, les idĂ©aux culturels et les spĂ©cificitĂ©s de la langue. Je mâintĂ©resse aux thĂšmes, aux images et aux clichĂ©s qui lui sont propres, notamment lâerrance, lâaliĂ©nation, le voyage et le passage Ă la vie adulte. Je fais aussi un recensement de quelques-uns des Ă©crits les plus rĂ©cents sur lâamĂ©ricanitĂ©, en relevant comment le terme a Ă©voluĂ©. Je puise dans les Ă©crits de chercheurs tels que RenĂ© Lapierre, Jean Morency et Pierre-Paul Ferland. Ce faisant, je dĂ©fends lâhypothĂšse que plus quâune position politique ou socioculturelle, lâamĂ©ricanitĂ© est un sentiment quâon porte en soi, une maniĂšre dâapprĂ©hender le rĂ©el. Le volet crĂ©ation de mon mĂ©moire prend la forme dâun court roman (provisoirement intitulĂ© Le gros Ă©ther) que je qualifie de noir rural et qui correspond, Ă mon avis, Ă une esthĂ©tique amĂ©ricaine. Il Ă©pouse les points de vue dâun pĂšre et de sa fille, qui ratissent la forĂȘt et les routes Ă la recherche dâun ami portĂ© disparu. Le rapport des personnages aux lieux y est central et sert de voie dâaccĂšs Ă la notion dâamĂ©ricanitĂ©
Renormalization group studies of quantum theories of gravity and matter
In this thesis, we study quantum theories of gravity and matter in the Renormalization Group approach. We observe light fermions in our universe which feature a remnant of chiral symmetry. While chiral symmetry appears to remain intact along the Renormalization Group flow of asymptotically safe approaches to quantum gravity, these computations are performed on a flat background. Mean field studies performed on negatively curved backgrounds however indicate chiral symmetry breaking in the form of gravitational catalysis. The study of the mean field RG flow on negatively curved spacetime leads to an upper bound for the ratio of curvature of local patches of spacetime to the RG scale. We extend these calculations to finite temperature and study how thermal fluctuations affect this bound from gravitational catalysis. Applying this thermal extension of the curvature bound to the asymptotic safety scenario of quantum gravity, it translates into an upper bound of numbers of fermion species allowed in our universe. Most approaches towards a UV complete quantum theory of gravity start with General Relativity as its classical theory. Einsteinâs formulation of gravity can be summarized as pseudo-Riemannian geometry on a manifold equipped with a metric and a connection. While this connection is restricted to the Levi-Cevita connection in Einstein gravity and therefore is fully determined by the metric, there is a priori no fundamental reason to not use a general connection. This formalism, in which the metric and the general connection are treated as independent degrees of freedom, is referred to as Hilbert-Palatini gravity. In this thesis, we compute the most general solution to the connection for the Einstein-Hilbert-Palatini action and use it in an on-shell reduction scheme to compute the RG flow for the subsequent order in the truncation. We find a UV- attractive fixed point similar to the Reuter fixed point in quantum Einstein gravity
Desarrollo del planeamiento bibliotecario en America Latina
The librarian planning in the Latin American and its relation to the educational and others services. The periods 1950/59, 1963/67, 1968 up to day. It is discussed the literature about the planning theory and methodology in the hispan-american countries.AnĂĄlise da idĂ©ia do planejamento bibliotecĂĄrio na AmĂ©rica Latina e sua inter-relação com o planejamento de serviços educacionais e outros. RevĂȘ os projetos e realizaçÔes no campo, a partir de seus antecedentes (1950 a 1959), e Ă luz de reuniĂ”es profissionais, congressos, seminĂĄrios, jornadas, etc. e de suas recomendaçÔes. O perĂodo de 1963/67 Ă© o inĂcio da preparação concreta de projetos. O perĂodo a partir de 1968 Ă© fecundo em estudos e tentativas. O planejamento bibliotecĂĄrio continua sendo tema constante de reuniĂ”es de profissionais. Estuda-se a literatura sobre a teoria e metodologia do planejamento nos paĂses hispano-americanos
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