Query Processing in a P2P Network of Taxonomy-based Information Sources

In this study we address the problem of answering queries over a peer-to-peer system of taxonomy-based sources. A taxonomy states subsumption relationships between negation-free DNF formulas on terms and negation-free conjunctions of terms. To the end of laying the foundations of our study, we first consider the centralized case, deriving the complexity of the decision problem and of query evaluation. We conclude by presenting an algorithm that is efficient in data complexity and is based on hypergraphs. We then move to the distributed case, and introduce a logical model of a network of taxonomy-based sources. On such network, a distributed version of the centralized algorithm is then presented, based on a message passing paradigm, and its correctness is proved. We finally discuss optimization issues, and relate our work to the literature

Achieving Rigor in Literature Reviews: Insights from Qualitative Data Analysis and Tool-Support

It is important for researchers to efficiently conduct quality literature studies. Hence, a structured and efficient approach is essential. We overview work that has demonstrated the potential for using software tools in literature reviews. We highlight the untapped opportunities in using an end-to-end tool-supported literature review methodology. Qualitative data-analysis tools such as NVivo are immensely useful as a means to analyze, synthesize, and write up literature reviews. In this paper, we describe how to organize and prepare papers for analysis and provide detailed guidelines for actually coding and analyzing papers, including detailed illustrative strategies to effectively write up and present the results. We present a detailed case study as an illustrative example of the proposed approach put into practice. We discuss the means, value, and also pitfalls of applying tool-supported literature review approaches. We contribute to the literature by proposing a four-phased tool-supported methodology that serves as best practice in conducting literature reviews in IS. By viewing the literature review process as a qualitative study and treating the literature as the “data set”, we address the complex puzzle of how best to extract relevant literature and justify its scope, relevance, and quality. We provide systematic guidelines for novice IS researchers seeking to conduct a robust literature review

Emerging trends proceedings of the 17th International Conference on Theorem Proving in Higher Order Logics: TPHOLs 2004

technical reportThis volume constitutes the proceedings of the Emerging Trends track of the 17th International Conference on Theorem Proving in Higher Order Logics (TPHOLs 2004) held September 14-17, 2004 in Park City, Utah, USA. The TPHOLs conference covers all aspects of theorem proving in higher order logics as well as related topics in theorem proving and verification. There were 42 papers submitted to TPHOLs 2004 in the full research cate- gory, each of which was refereed by at least 3 reviewers selected by the program committee. Of these submissions, 21 were accepted for presentation at the con- ference and publication in volume 3223 of Springer?s Lecture Notes in Computer Science series. In keeping with longstanding tradition, TPHOLs 2004 also offered a venue for the presentation of work in progress, where researchers invite discussion by means of a brief introductory talk and then discuss their work at a poster session. The work-in-progress papers are held in this volume, which is published as a 2004 technical report of the School of Computing at the University of Utah

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