Temporal models for mining, ranking and recommendation in the Web

Due to their first-hand, diverse and evolution-aware reflection of nearly all areas of life, heterogeneous temporal datasets i.e., the Web, collaborative knowledge bases and social networks have been emerged as gold-mines for content analytics of many sorts. In those collections, time plays an essential role in many crucial information retrieval and data mining tasks, such as from user intent understanding, document ranking to advanced recommendations. There are two semantically closed and important constituents when modeling along the time dimension, i.e., entity and event. Time is crucially served as the context for changes driven by happenings and phenomena (events) that related to people, organizations or places (so-called entities) in our social lives. Thus, determining what users expect, or in other words, resolving the uncertainty confounded by temporal changes is a compelling task to support consistent user satisfaction. In this thesis, we address the aforementioned issues and propose temporal models that capture the temporal dynamics of such entities and events to serve for the end tasks. Specifically, we make the following contributions in this thesis: (1) Query recommendation and document ranking in the Web - we address the issues for suggesting entity-centric queries and ranking effectiveness surrounding the happening time period of an associated event. In particular, we propose a multi-criteria optimization framework that facilitates the combination of multiple temporal models to smooth out the abrupt changes when transitioning between event phases for the former and a probabilistic approach for search result diversification of temporally ambiguous queries for the latter. (2) Entity relatedness in Wikipedia - we study the long-term dynamics of Wikipedia as a global memory place for high-impact events, specifically the reviving memories of past events. Additionally, we propose a neural network-based approach to measure the temporal relatedness of entities and events. The model engages different latent representations of an entity (i.e., from time, link-based graph and content) and use the collective attention from user navigation as the supervision. (3) Graph-based ranking and temporal anchor-text mining inWeb Archives - we tackle the problem of discovering important documents along the time-span ofWeb Archives, leveraging the link graph. Specifically, we combine the problems of relevance, temporal authority, diversity and time in a unified framework. The model accounts for the incomplete link structure and natural time lagging in Web Archives in mining the temporal authority. (4) Methods for enhancing predictive models at early-stage in social media and clinical domain - we investigate several methods to control model instability and enrich contexts of predictive models at the “cold-start” period. We demonstrate their effectiveness for the rumor detection and blood glucose prediction cases respectively. Overall, the findings presented in this thesis demonstrate the importance of tracking these temporal dynamics surround salient events and entities for IR applications. We show that determining such changes in time-based patterns and trends in prevalent temporal collections can better satisfy user expectations, and boost ranking and recommendation effectiveness over time

The memory remains: understanding collective memory in the digital age

Recently developed information communication technologies, particularly the Internet, have affected how we, both as individuals and as a society, create, store, and recall information. The Internet also provides us with a great opportunity to study memory using transactional large-scale data in a quantitative framework similar to the practice in natural sciences. We make use of online data by analyzing viewership statistics of Wikipedia articles on aircraft crashes. We study the relation between recent events and past events and particularly focus on understanding memory-triggering patterns. We devise a quantitative model that explains the flow of viewership from a current event to past events based on similarity in time, geography, topic, and the hyperlink structure of Wikipedia articles. We show that, on average, the secondary flow of attention to past events generated by these remembering processes is larger than the primary attention flow to the current event. We report these previously unknown cascading effects

Casas partilhadas monetizadas: a experiência turística e seus efeitos na autenticidade percebida, no apego ao destino e na lealdade

The emergence of the shared peer-to-peer accommodation (SP2PA) has attracted the attention of practitioners and academics, given this new business model’s increasing popularity amongst travellers. It is therefore suggested that this type of accommodation can offer a differentiated, eventually more authentic, experience to its guests, introducing new values and meanings to the hospitality provided at destinations. To sustain this argument, it is important to enhance the understanding of guest experiences while staying in such a SP2PA, while also the impact of these new tourist behaviour patterns on destinations is worthwhile exploring. Taking into account the relevance of understanding the tourist experience associated with the SP2PA, this study aims to gain theoretical and empirical understanding of the SP2PA guest experience by proposing and testing a theoretical model that estimates the relationships between the dimensions of the tourist experience (the SP2PA guest experience) and the constructs of ‘destination attachment’, ‘perception of authenticity’, ‘destination attitudinal loyalty’ and ‘SP2PA attitudinal loyalty’. To achieve this goal, two complementary methodology stages were undertaken: (i) an ‘exploratory qualitative approach’ by conducting focus group discussions and passive netnography; and (ii) a ‘quantitative approach’ by applying a survey to a convenience sample of SP2PA guests. Statistical analysis of data used descriptive and inferential methods, with the Partial Least Squares (PLSSEM) as the main method for testing the hypotheses. A total of 409 valid responses were used to test the proposed conceptual model. Findings confirm the ‘aesthetic’, ‘escape’, ‘entertainment’, ‘educative’, ‘affective’, ‘social interaction’, and ‘sharing experience’ dimensions as appropriated dimensions to analyse the SP2PA guest experience. Amongst these dimensions, the ‘educative’, ‘social interaction’, ‘aesthetics’, ‘sharing’, and ‘affective’ are, in this order, the dimensions that most influence the SP2PA guest experience. Regarding the influence of the SP2PA guest experience on the tourist experience outcomes, this study demonstrates that this experience positively influences the ‘perception of destination authenticity’ and ‘destination attachment’ formation. In turn, destination attachment mediates the relationship between the ‘SP2PA guest experience’ and ‘destination loyalty’, while the SP2PA guest experience predicts the ‘SP2PA attitudinal loyalty’. Besides, the ‘perception of authenticity’ positively influences ‘destination attachment’ formation and ‘SP2PA attitudinal loyalty’. The results contribute to the tourist experience theory by providing an empirically-based insight into its dimensionality in the hospitality sharing economy context. This study also provides an analytical framework to understand the effects of the SP2PA guest experience on constructs such as the perception of authenticity, destination attachment and tourist loyalty. Furthermore, results may help design management strategies for both SP2PA platforms and SP2PA hosts to develop and implement an experience-oriented service strategy in order to achieve a memorable experience for SP2PA guests and create positive future behavioural intentions. Limitations of the study and suggestions for further research complete the picture.O surgimento do alojamento partilhado pessoa para pessoa (SP2PA) tem vindo a atrair a atenção de profissionais e acadêmicos uma vez que esse novo modelo de negócio tem ganho crescente popularidade entre os viajantes. Sugere-se, portanto, que esse tipo de alojamento ofereça aos seus hóspedes uma experiência diferenciada, eventualmente mais autêntica, introduzindo novos valores e significados à hospitalidade proporcionada nos destinos. Para sustentar esse argumento, é importante melhorar a compreensão das experiências dos hóspedes durante a permanência em um SP2PA, ao mesmo tempo em que vale a pena explorar o impacto desses novos padrões de comportamento turístico nos destinos. Tendo em vista a relevância de compreender a experiência turística associada ao SP2PA, este estudo tem como objetivo desenvolver uma compreensão teórica e empírica da experiência dos hóspedes no SP2PA, propondo e testando um modelo teórico descritivo que estima as relações entre as dimensões da experiência turística (a experiência dos hóspedes no SP2PA) e os construtos de ‘apego de destino', 'percepção de autenticidade', 'lealdade atitudinal ao destino' e 'lealdade atitudinal ao SP2PA'. Para atingir esse objetivo, duas etapas metodológicas complementares foram realizadas: (i) uma "abordagem exploratória qualitativa", conduzindo as técnicas de grupos focais e netnografia passiva; e (ii) uma "abordagem quantitativa", administrando uma pesquisa a uma amostra conveniente de hóspedes do SP2PA. A análise estatística dos dados utilizou métodos descritivos e inferenciais, sendo o principal método para testar as hipóteses a modelagem de mínimos quadrados parciais - PLS-SEM. Assim, 409 questionários foram utilizados para testar o modelo conceitual proposto. Os resultados confirmam a "estética", "escape", "entretenimento", "educativa", "afetiva", "interação social" e "experiências de partilha" como dimensões apropriadas para analisar a experiência dos hóspedes no SP2PA. Entre essas dimensões, "educativa", "interação social", "estéticas", "partilha" e "afetivas" são, nessa ordem, as dimensões que mais influenciam a experiência dos hóspedes no SP2PA. Com relação à influência da experiência dos hóspedes no SP2PA nos resultados analisados da experiência turística, este estudo demonstra que a experiência dos hóspedes no SP2PA influencia positivamente a ‘perceção da autenticidade’ do destino" e a formação do ‘apego ao destino’. Por sua vez, o ‘apego ao destino’ media a relação entre a "experiência dos hóspedes do SP2PA’ e a "lealdade ao destino", enquanto a experiência dos hóspedes do SP2PA condiciona positivamente a “lealdade atitudinal ao SP2PA". Além disso, a "perceção da autenticidade" influencia positivamente a formação do "apego ao destino" e a "lealdade atitudinal ao SP2PA". Os resultados contribuem para a teoria da experiência turística, especificamente em contexto de alojamento turístico partilhado, monetizado, fornecendo uma visão baseada empiricamente em sua dimensionalidade no contexto da economia da partilha na hospitalidade. Este estudo também fornece uma estrutura analítica para a compreensão dos efeitos da experiência dos hóspedes no SP2PA em constructos como a perceção de autenticidade, o apego ao destino e a lealdade do turista. Além disso, poderá auxiliar o gerenciamento de plataformas SP2PA e aos anfitriões do SP2PA a desenvolver e implementar uma estratégia de serviço orientada à experiência, a fim de obter uma experiência memorável para os hóspedes no SP2PA e criar intenções comportamentais futuras positivas. Limitações do estudo e sugestões para futuras pesquisas completam o quadro.Programa Doutoral em Turism

Planning, Nature and Ecosystem Services

This book collects the papers presented at INPUT aCAdemy 2019, a special edition of the INPUT Conference hosted by the Department of Civil and Environmental Engineering, and Architecture (DICAAR) of the University of Cagliari. INPUT aCAdemy Conference will focus on contemporary planning issues with particular attention to ecosystem services, green and blue infrastructure and governance and management of Natura 2000 sites and coastal marine areas. INPUT aCAdemy 2019 is organized within the GIREPAM Project (Integrated Management of Ecological Networks through Parks and Marine Areas), co-funded by the European Regional Development Fund (ERDF) in relation to the 2014-2020 Interreg Italy – France (Maritime) Programme. INPUT aCAdemy 2019 is supported by Società Italiana degli Urbanisti (SIU, the Italian Society of Spatial Planners), Istituto Nazionale di Urbanistica (INU, the Italian National Institute of Urban Planning), UrbIng Ricerca Scientifica (the Association of Spatial Planning Scholars of the Italian Schools of Engineering) and Ordine degli Ingegneri di Cagliari (OIC, Professional Association of Engineers of Cagliari).illustratorThis book collects the papers presented at INPUT aCAdemy 2019, a special edition of the INPUT Conference hosted by the Department of Civil and Environmental Engineering, and Architecture (DICAAR) of the University of Cagliari. INPUT aCAdemy Conference will focus on contemporary planning issues with particular attention to ecosystem services, green and blue infrastructure and governance and management of Natura 2000 sites and coastal marine areas. INPUT aCAdemy 2019 is organized within the GIREPAM Project (Integrated Management of Ecological Networks through Parks and Marine Areas), co-funded by the European Regional Development Fund (ERDF) in relation to the 2014-2020 Interreg Italy – France (Maritime) Programme. INPUT aCAdemy 2019 is supported by Società Italiana degli Urbanisti (SIU, the Italian Society of Spatial Planners), Istituto Nazionale di Urbanistica (INU, the Italian National Institute of Urban Planning), UrbIng Ricerca Scientifica (the Association of Spatial Planning Scholars of the Italian Schools of Engineering) and Ordine degli Ingegneri di Cagliari (OIC, Professional Association of Engineers of Cagliari)

The Music Sound

A guide for music: compositions, events, forms, genres, groups, history, industry, instruments, language, live music, musicians, songs, musicology, techniques, terminology , theory, music video. Music is a human activity which involves structured and audible sounds, which is used for artistic or aesthetic, entertainment, or ceremonial purposes. The traditional or classical European aspects of music often listed are those elements given primacy in European-influenced classical music: melody, harmony, rhythm, tone color/timbre, and form. A more comprehensive list is given by stating the aspects of sound: pitch, timbre, loudness, and duration. Common terms used to discuss particular pieces include melody, which is a succession of notes heard as some sort of unit; chord, which is a simultaneity of notes heard as some sort of unit; chord progression, which is a succession of chords (simultaneity succession); harmony, which is the relationship between two or more pitches; counterpoint, which is the simultaneity and organization of different melodies; and rhythm, which is the organization of the durational aspects of music