From timeout-based to item-by-item analysis : investigating methodologies for splitting user sessions originated from shared accounts in online platforms

Although some content providers register stream data from its users and can track their profile style for content recommendation, when two or more users share a same account, their true profile activity is obfuscated and fuzzed. This user behavior hinders the recommender systems from providers, moreover, the growing concerns on user privacy poses a risk to current models that rely on unconcealed user identity. This work proposes a way of classifying users’ stream data trough sessions, based only on its media content, opening the possibility for breaking a same account profile within multiple user profiles and consequently identifying this activity. In this work dimensionality reduction and clustering methods are used to classify user stream data into sessions that correspond to each respective user profile. Experiments show that the event-driven nature of news content can challenge the construction of a session splitting method based exclusively on content-type without user profiling.Embora as provedoras de conteúdos registram dados de acessos de seus usuários e consigam analisar seus perfis para recomendações de conteúdo, quando duas ou mais pessoas compartilham da mesma conta a atividade e perfil original e individual de cada usuário é obfuscada e difusa por essas contas compartilhadas. Este comportamento confunde os sistemas de recomendação existentes, além disso, o aumento da preocupação com a privacidade dos usuários coloca em risco os modelos atuais que são dependentes de reconhecimento explícito dos usuários. Este trabalho propõe uma maneira de classificar o fluxo de dados dos usuários em sessões baseando-se apenas em seu conteúdo, abrindo portas para quebrar a mesma conta em múltiplos perfis de usuários e consequentemente identificando esta atividade. Neste trabalho técnicas de redução de dimensionalidade e métodos de clusterização são utilizados para classificar o fluxo de dados em sessões que correspondem respectivamente a cada perfil de usuário. Experimentos mostram que a natureza guiada a eventos dos conteúdos de notícias tornam desafiador a construção de um método de quebra de sessões exclusivamente baseado em categorização de conteúdo sem perfilização de usuário

Time Interval-enhanced Graph Neural Network for Shared-account Cross-domain Sequential Recommendation

Shared-account Cross-domain Sequential Recommendation (SCSR) task aims to recommend the next item via leveraging the mixed user behaviors in multiple domains. It is gaining immense research attention as more and more users tend to sign up on different platforms and share accounts with others to access domain-specific services. Existing works on SCSR mainly rely on mining sequential patterns via Recurrent Neural Network (RNN)-based models, which suffer from the following limitations: 1) RNN-based methods overwhelmingly target discovering sequential dependencies in single-user behaviors. They are not expressive enough to capture the relationships among multiple entities in SCSR. 2) All existing methods bridge two domains via knowledge transfer in the latent space, and ignore the explicit cross-domain graph structure. 3) None existing studies consider the time interval information among items, which is essential in the sequential recommendation for characterizing different items and learning discriminative representations for them. In this work, we propose a new graph-based solution, namely TiDA-GCN, to address the above challenges. Specifically, we first link users and items in each domain as a graph. Then, we devise a domain-aware graph convolution network to learn userspecific node representations. To fully account for users' domainspecific preferences on items, two effective attention mechanisms are further developed to selectively guide the message passing process. Moreover, to further enhance item- and account-level representation learning, we incorporate the time interval into the message passing, and design an account-aware self-attention module for learning items' interactive characteristics. Experiments demonstrate the superiority of our proposed method from various aspects.Comment: 15 pages, 6 figure

Semantic discovery and reuse of business process patterns

Patterns currently play an important role in modern information systems (IS) development and their use has mainly been restricted to the design and implementation phases of the development lifecycle. Given the increasing significance of business modelling in IS development, patterns have the potential of providing a viable solution for promoting reusability of recurrent generalized models in the very early stages of development. As a statement of research-in-progress this paper focuses on business process patterns and proposes an initial methodological framework for the discovery and reuse of business process patterns within the IS development lifecycle. The framework borrows ideas from the domain engineering literature and proposes the use of semantics to drive both the discovery of patterns as well as their reuse

Unmet goals of tracking: within-track heterogeneity of students' expectations for

Educational systems are often characterized by some form(s) of ability grouping, like tracking. Although substantial variation in the implementation of these practices exists, it is always the aim to improve teaching efficiency by creating homogeneous groups of students in terms of capabilities and performances as well as expected pathways. If students’ expected pathways (university, graduate school, or working) are in line with the goals of tracking, one might presume that these expectations are rather homogeneous within tracks and heterogeneous between tracks. In Flanders (the northern region of Belgium), the educational system consists of four tracks. Many students start out in the most prestigious, academic track. If they fail to gain the necessary credentials, they move to the less esteemed technical and vocational tracks. Therefore, the educational system has been called a 'cascade system'. We presume that this cascade system creates homogeneous expectations in the academic track, though heterogeneous expectations in the technical and vocational tracks. We use data from the International Study of City Youth (ISCY), gathered during the 2013-2014 school year from 2354 pupils of the tenth grade across 30 secondary schools in the city of Ghent, Flanders. Preliminary results suggest that the technical and vocational tracks show more heterogeneity in student’s expectations than the academic track. If tracking does not fulfill the desired goals in some tracks, tracking practices should be questioned as tracking occurs along social and ethnic lines, causing social inequality

TextFrame: Cosmopolitanism and Non-Exclusively Anglophone Poetries

This project proposes a replacement for some institutional-archival mechanisms of non-exclusively anglophone poetry as it is produced under racial capitalism and archived via its universities and grant-bearing nonprofits. The project argues specifically for the self-archiving of non-exclusively anglophone poetry, and by extension of poetry, in a manner that builds away from US-dominated, nationally-organized institutions. It argues that cosmopolitanist norm translation, as advocated by various critics, can function as part of a critique of institutional value creation used in maintaining inequalities through poetry. The US-based Poetry Foundation is currently the major online archive of contemporary anglophone poetry; the project comprises a series of related essays that culminate in a rough outline for a collaboratively designed, coded, and maintained application to replace the Foundation’s website. Whatever benefit might result, replacing archival mechanisms of racial capitalism while remaining within its systemic modes of value creation is at best a form of substitution: it is not an actual change in relations and not a transition to anything. Doing so may, however, allow greater clarity in understanding how poetry is situated within US-based institutions, beyond the images and values that poets and critics in the US often help to maintain. Chapter one, “‘Indianness’ and Omission: 60 Indian Poets,” reads the anthology 60 Indian Poets, published in 2008 in India and the UK (with US distribution), as argument about the contours of Indian Poetry in English and about the contours of India’s relations in the world. It relates Rashmi Sadana’s work on the meanings of English in India to decisions made within the anthology, and look further at Pollock’s conception of cosmopolitanism and vernacularity, particular as it applies to the Indian North-East and the poetry of Kynpham Sing Nongkynrih. The second chapter, “Archival Power: Individualization, the Racial State, and Institutional Poetry” engages Roderick Ferguson’s concept of archival power to explain the 2015 “crisis” within contemporary US poetry driven by practitioners of conceptual poetry, and an attempted archival act with regard to the Black Lives Matter movement. The chapter ends with a fragment of Alexis Pauline Gumbs’s recent account of US university life as experienced by Black artists and scholars. That chapter is followed by “The Poetry Foundation as Site of Archival Power,” which extends Jodi Melamed’s critique of US university value-creation mechanisms to Poetry magazine and the Poetry Foundation’s website. It argues that the Poetry Foundation functions as a de facto arm of the US university system as outlined in the previous chapter, and aids in capitalist value-creation. “TextFrame: An Open Archive for Poetry,” the fourth chapter, is an attempt to begin thinking a replacement for current mechanisms of archiving non-exclusively anglophone poetry. The fifth chapter, “Narayanan’s Language Events as Free-Tier Application,” documents work imagined for TextFrame, as an application, that has actually already been built: the poet and scholar Vivek Narayanan adapted Robert Desnos’s Language Events for the classroom using a variety of discrete free services, and the present author collaborated with Narayanan in creating a stand-alone Web application. Chapters six, seven, and eight function as case studies to be used in creating templates for providing context to specific poems within any built application. Both of the specific moments covered transmogrify the “anti-psychological.” The sixth chapter, “An Unendurable Age: Ashbery, O’Hara, and 1950s Precursors of ‘Self’ Psychology” thus argues that an anti-psychological ethos is developed in Ashbery and O’Hara’s poems of that moment. It shows that Frank O’Hara’s “Personism: A Manifesto” (1959) is almost certainly a parody of Gordon Allport’s theory of Personalism, of related strands of 1950s American psychology, and of the poetry that developed alongside them in the 1930s. It follows other critics in looking at midcentury conceptions of schizophrenia as a specifically homosexual disease, and argues for the importance of contemporarily published examples of schizophrenic discourse, particularly those of Harry Stack Sullivan. It argues that Ashbery’s poem “A Boy” can be read as directly engaging those ideas, and opposing them. The shorter discussions follow consider the affinities that Some Trees has with anti- or a-psychological theories of mind that were being developed at Harvard and MIT at the time that Ashbery and O’Hara were in Cambridge, including generative grammar and critiques of philosophical analyticity. The eighth chapter, “Before Conceptualism: Disgust and Over-determination in White-dominated Experimental Poetry in New York, 1999-2003,” highlights Dan Farrell and Lytle Shaw’s very different uses of lyric’s peculiar staging of voice to foreground the multi-furcation of white identities and voice in response to state pressures. The last two chapters take up two corollaries, or theoretical concerns that fell out trying to think a cosmopolitanist application. The first, “Why Not Reddit?” examines existing commercial cosmopolitanist solutions for some of the functionality proposed for the application, and reasons for rejecting them. In doing so, it discusses Thomas Farrell’s construct of “rhetorical culture” in detail, and traces a theory of communication and authorship within a community, particularly with regard to thinking history. The last chapter (and second corollary) is titled “Ethos in Pedagogy as a Limit on Norm Translation.” It establishes the Aristotelian concept of ethos as a pedagogical limit for norm translation. The study’s governing interest is not the conflicts or differences between practitioners or tendencies that are detailed here, but their relative incomprehensibility of those differences outside of their formative contexts