Incorporating social role theory into topic models for social media content analysis

In this paper, we explore the idea of social role theory (SRT) and propose a novel regularized topic model which incorporates SRT into the generative process of social media content. We assume that a user can play multiple social roles, and each social role serves to fulfil different duties and is associated with a role-driven distribution over latent topics. In particular, we focus on social roles corresponding to the most common social activities on social networks. Our model is instantiated on microblogs, i.e., Twitter and community question-answering (cQA), i.e., Yahoo! Answers, where social roles on Twitter include "originators" and "propagators", and roles on cQA are "askers" and "answerers". Both explicit and implicit interactions between users are taken into account and modeled as regularization factors. To evaluate the performance of our proposed method, we have conducted extensive experiments on two Twitter datasets and two cQA datasets. Furthermore, we also consider multi-role modeling for scientific papers where an author's research expertise area is considered as a social role. A novel application of detecting users' research interests through topical keyword labeling based on the results of our multi-role model has been presented. The evaluation results have shown the feasibility and effectiveness of our model.

From Spanish paintings to murder:topic transitions in casual conversations between native and non-native speakers of English

This article explores some of the strategies used by international students of English to manage topic shifts in casual conversations with English-speaking peers. It therefore covers aspects of discourse which have been comparatively under-researched, and where research has also tended to focus on the problems rather than the communicative achievements of non-native speakers. A detailed analysis of the conversations under discussion, which were recorded by the participants themselves, showed that they all flowed smoothly, and this was in large measure due to the ways in which topic shifts were managed. The paper will focus on a very distinct type of topic shift, namely that of topic transitions, which enable a smooth flow from one topic to another, but which do not explicitly signal that a shift is taking place. It will examine how the non-native speakers achieved coherence in the topic transitions which they initiated, which strategies or procedures they employed, and show how their initiations were effective in enabling the proposed topic to be understood, taken up and developed. It therefore adds to our understanding of the interactional achievements of international speakers in informal, social contexts. © 2013 Elsevier B.V.

Linked knowledge sources for topic classification of microposts:a semantic graph-based approach

Short text messages a.k.a Microposts (e.g. Tweets) have proven to be an effective channel for revealing information about trends and events, ranging from those related to Disaster (e.g. hurricane Sandy) to those related to Violence (e.g. Egyptian revolution). Being informed about such events as they occur could be extremely important to authorities and emergency professionals by allowing such parties to immediately respond. In this work we study the problem of topic classification (TC) of Microposts, which aims to automatically classify short messages based on the subject(s) discussed in them. The accurate TC of Microposts however is a challenging task since the limited number of tokens in a post often implies a lack of sufficient contextual information. In order to provide contextual information to Microposts, we present and evaluate several graph structures surrounding concepts present in linked knowledge sources (KSs). Traditional TC techniques enrich the content of Microposts with features extracted only from the Microposts content. In contrast our approach relies on the generation of different weighted semantic meta-graphs extracted from linked KSs. We introduce a new semantic graph, called category meta-graph. This novel meta-graph provides a more fine grained categorisation of concepts providing a set of novel semantic features. Our findings show that such category meta-graph features effectively improve the performance of a topic classifier of Microposts. Furthermore our goal is also to understand which semantic feature contributes to the performance of a topic classifier. For this reason we propose an approach for automatic estimation of accuracy loss of a topic classifier on new, unseen Microposts. We introduce and evaluate novel topic similarity measures, which capture the similarity between the KS documents and Microposts at a conceptual level, considering the enriched representation of these documents. Extensive evaluation in the context of Emergency Response (ER) and Violence Detection (VD) revealed that our approach outperforms previous approaches using single KS without linked data and Twitter data only up to 31.4% in terms of F1 measure. Our main findings indicate that the new category graph contains useful information for TC and achieves comparable results to previously used semantic graphs. Furthermore our results also indicate that the accuracy of a topic classifier can be accurately predicted using the enhanced text representation, outperforming previous approaches considering content-based similarity measures. © 2014 Elsevier B.V. All rights reserved.

How to Select a Topic for a Project

Иванка Марашева-Делинова - В настоящата работа се разглежда избора на тема при разработване на проекти в непрофилирани по математика класове. Посочват се критерии за подбор на тема. Предлагат се примерни теми и източници за разработка, съобразени с възрастовите и индивидуални особености на учениците, както и техните общи и индивидуални интереси.

Topic Segmentation: How Much Can We Do by Counting Words and Sequences of Words

In this paper, we present an innovative topic segmentation system based on a new informative similarity measure that takes into account word co-occurrence in order to avoid the accessibility to existing linguistic resources such as electronic dictionaries or lexico-semantic databases such as thesauri or ontology. Topic segmentation is the task of breaking documents into topically coherent multi-paragraph subparts. Topic segmentation has extensively been used in information retrieval and text summarization. In particular, our architecture proposes a language-independent topic segmentation system that solves three main problems evidenced by previous research: systems based uniquely on lexical repetition that show reliability problems, systems based on lexical cohesion using existing linguistic resources that are usually available only for dominating languages and as a consequence do not apply to less favored languages and finally systems that need previously existing harvesting training data. For that purpose, we only use statistics on words and sequences of words based on a set of texts. This solution provides a flexible solution that may narrow the gap between dominating languages and less favored languages thus allowing equivalent access to information.

A Statistical Approach for Multilingual Document Clustering and Topic Extraction from Clusters

2000 Mathematics Subject Classification: 62H30

Harnessing linked knowledge sources for topic classification in social media

Topic classification (TC) of short text messages offers an effective and fast way to reveal events happening around the world ranging from those related to Disaster (e.g. Sandy hurricane) to those related to Violence (e.g. Egypt revolution). Previous approaches to TC have mostly focused on exploiting individual knowledge sources (KS) (e.g. DBpedia or Freebase) without considering the graph structures that surround concepts present in KSs when detecting the topics of Tweets. In this paper we introduce a novel approach for harnessing such graph structures from multiple linked KSs, by: (i) building a conceptual representation of the KSs, (ii) leveraging contextual information about concepts by exploiting semantic concept graphs, and (iii) providing a principled way for the combination of KSs. Experiments evaluating our TC classifier in the context of Violence detection (VD) and Emergency Responses (ER) show promising results that significantly outperform various baseline models including an approach using a single KS without linked data and an approach using only Tweets. Copyright 2013 ACM.

Negotiating topic changes:native and non-native speakers of English in conversation

There is a tendency to view conversations involving non-native speakers (NNSs) as inevitably fraught with problems, including an inability to handle topic management. This article, in contrast, will focus on effective topic changes made by non-native speakers during informal conversations with native speakers of English. A micro-analysis of ten conversations revealed several ways of shifting conversational topics; however, the article concentrates on those strategies which the participants used to effect a particular type of topic move, namely 'marked topic changes', where there is no connection at all with previous talk. The findings show how these topic changes were jointly negotiated, and that the non-native speakers' contributions to initiating new topics were competently managed.

Az 1990-2000 között benyújtott magyar szabadalmi bejelentések környezeti hatásának idősoros elemzése (Time series analysis of environmental effects of submitted Hungarian patents between 1990 and 2000)

A szerző e kutatás keretében az 1990–2000 közötti időszak magyar intézményi és egyéni szabadalmi bejelentők, illetve jogosultak („szabadalmasok”) szabadalmainak környezeti hatását vizsgálja. Konkrétan az ebben az időszakban a Magyar Szabadalmi Hivatalnál benyújtott szabadalmi bejelentésekből elfogadott szabadalmakat tanulmányozza, a PIPACS adatbázisban található szabadalmi leírások alapján. A pozitív környezeti hatású szabadalmak száma, valamint az összes szabadalomhoz viszonyított aránya alapján von le következtetéseket a magyar környezeti innovációs tevékenységről, és ennek potenciális magyar környezeti hatásáról. A pozitív környezeti hatású szabadalmak összes megadott szabadalomhoz viszonyított aránya az időszakban 92%-os szignifikanciaszinten növekszik. _______

A szabadalmak megkérdőjeleződött hasznossága (Questioned usefulness of patents)

A cikk a szabadalmak gazdaságban betöltött szerepével, az innovációra és a társadalmi hasznosságra gyakorolt hatásával kapcsolatos fontosabb elméleteket és empirikus kutatásokat foglalja össze. Számos újabb keletű vagy újra aktuálissá vált elmélet vitatja jelenlegi formájában a szabadalmak létjogosultságát. A meglévő empirikus kutatások eredményei is jellemzően azt mutatják, hogy a szabadalmak ugyan betöltik hagyományos szerepüket az innovációk védelmében, de néhány iparág kivételével csak az innovációk kis része esetében nélkülözhetetlenek. Az innovációk nagy része tehát szabadalmak nélkül is megvalósulna, nem feltétlenül lenne szükség minden esetben időleges monopóliumok létrehozására. Az innováció védelmén túlmutató stratégiai szabadalmi motivációk pedig számos olyan negatív hatással járnak, amelyek egyenesen gátolják az innovációs tevékenységet. Konklúzióként a kutatók jellemzően a jelenlegi rendszer reformját, a szabadalmaztatható technológiák körének szűkítését, néhányan pedig a szabadalmi rendszer megszüntetésének megfontolását javasolják. _____ This article summarizes the major theories and findings of empirical researches, regarding the role of patents in the economy and their effects on innovation and social utility. Numerous recent theories along with some reinvigorated older ones question the justification of the patent system. Most empirical studies show that although patents serve their traditional role in protecting innovation, they are not essential for the majority of the innovations in most industries. Most innovations would be generated even without patents and there would be no need for creating temporary monopolies in every case. Next to the protection from imitation, there are strategic motivations for patenting, and some unambiguously have a negative effect on innovative activity. As a conclusion, researchers suggest the reform of the patent system, the restriction of patentable technologies, and some suggest considering the abolishment of the patent system.

Sentiment-Topic Modelling in Text Mining

Peer reviewed

Sentiment-Topic Modelling in Text Mining

Peer reviewed

A Curated Corpus for Sentiment-Topic Analysis

Postprint

Sentiment-Topic Modelling in Text Mining

Peer reviewed