Peer-to-peer semantic integration of linked data

We propose a framework for peer-based integration of linked data sets, where the semantic relationships between data at different peers are expressed through mappings. We provide the theoretical foundations for such a setting and we devise an algorithm for processing graph pattern queries, discussing its complexity and scalability

Toward Self-Organising Service Communities

This paper discusses a framework in which catalog service communities are built, linked for interaction, and constantly monitored and adapted over time. A catalog service community (represented as a peer node in a peer-to-peer network) in our system can be viewed as domain specific data integration mediators representing the domain knowledge and the registry information. The query routing among communities is performed to identify a set of data sources that are relevant to answering a given query. The system monitors the interactions between the communities to discover patterns that may lead to restructuring of the network (e.g., irrelevant peers removed, new relationships created, etc.)

Taming Data Explosion in Probabilistic Information Integration

Data integration has been a challenging problem for decades. In an ambient environment, where many autonomous devices have their own information sources and network connectivity is ad hoc and peer-to-peer, it even becomes a serious bottleneck. To enable devices to exchange information without the need for interaction with a user at data integration time and without the need for extensive semantic annotations, a probabilistic approach seems rather promising. It simply teaches the device how to cope with the uncertainty occurring during data integration. Unfortunately, without any kind of world knowledge, almost everything becomes uncertain, hence maintaining all possibilities produces huge integrated information sources. In this paper, we claim that only very simple and generic rules are enough world knowledge to drastically reduce the amount of uncertainty, hence to tame the data explosion to a manageable size

GLOBAL INDEX CONSTRUCTION FOR DATA INTEGRATION IN LARGE SCALE SYSTEM

Several scientific projects focused on the creation of Peer-to-Peer data management system. The main objective of these systems is to allow data sharing and integration among a large set of distributed, heterogeneous data sources. The emergence of large scale systems provides solutions and brings to surface new challenging unsolved problems, among which, we address the data integration problem. In order to address this problem, we propose a new data integration approach that allows the semantic integration of heterogeneous and distributed data sources in a Peer-to-Peer environment with high distribution and evolution support. In this paper, we provide an introduction to the approaches; problems and research issues encountered when dealing with data integration.We present our approach and describe the several methods for constructing a global index that is the core of our approach by using semantic similarities. We end our work by an application example

Architektura gridu bazodanowego oparta o podejście peer-to-peer

W artykule autorzy przedstawiają zaimplementowane i zweryfikowane poprzez w pełni funkcjonalny prototyp, podejście do realizacji obiektowego gridu bazodanowego przy wykorzystaniu wirtualnej sieci peer-to-peer omawiając szczegółowo najważniejszy element mechanizmu jakim jest proces integracji rozproszonych obiektów. W artykule przeprowadzono gruntowną analizę rozwiązań będących fundamentalnym zbiorem wiedzy na temat integracji danych. Zaprezentowano trójwarstwowy model intagracyjny oparty o aktualizowalne obiektowe perspektywy oraz prototyp gridowej warstwy pośredniej wykorzystującej sieć wirtualną peer-to-peer.In the article authors present an approach for realisation of object-oriented database grid using virtual peer-to-peer networking. The approach has been verified by implementation of fully functional prototype. The article shows in details a process for integration of distributed objects which is provided by the core mechanism of the prototype. Authors also described three-layer integration model based on obiect-oriented updateable views and middleware prototype containing mentioned peer-to-peer solution. Moreover the article contains analysis of solutions being the fundamental knowledge about integration of data

Peer Data Management

Peer Data Management (PDM) deals with the management of structured data in unstructured peer-to-peer (P2P) networks. Each peer can store data locally and define relationships between its data and the data provided by other peers. Queries posed to any of the peers are then answered by also considering the information implied by those mappings. The overall goal of PDM is to provide semantically well-founded integration and exchange of heterogeneous and distributed data sources. Unlike traditional data integration systems, peer data management systems (PDMSs) thereby allow for full autonomy of each member and need no central coordinator. The promise of such systems is to provide flexible data integration and exchange at low setup and maintenance costs. However, building such systems raises many challenges. Beside the obvious scalability problem, choosing an appropriate semantics that can deal with arbitrary, even cyclic topologies, data inconsistencies, or updates while at the same time allowing for tractable reasoning has been an area of active research in the last decade. In this survey we provide an overview of the different approaches suggested in the literature to tackle these problems, focusing on appropriate semantics for query answering and data exchange rather than on implementation specific problems

Professional development of ICT integration for secondary school teachers in Hong Kong: Towards a peer support enhanced model

Although information and communication technology (ICT) has gradually become a standard teaching technology in schools in many countries and regions like Hong Kong, the implementation of ICT in teaching and learning in schools still fails to meet high government and public expectations. This study was an investigation into the potential of peer support to enhance professional development of ICT integration for secondary school teachers in Hong Kong. The study utilized peer support as a social approach to professional development and employed action research to examine the experiences of ten secondary school teachers who worked in five peer support groups for sixteen months. A peer support model was introduced to the participants who then applied these principles in their own contexts. Data on participants' reflections and evaluations of the peer support process was collected through individual interviews and peer-group conferences. Each participant was interviewed at the beginning, middle and end of the research period and each peer group was interviewed at the end of the project. By employing a grounded theory approach, themes related to the participants' experiences of peer support for ICT integration and the impact of peer support as a means of professional development were generated from the data. The study's findings indicate that the participants responded positively to peer support as a means of professional development. Peer support was successful in: increasing professional interactions; broadening perspectives of ICT; increasing reflection; and providing personal and emotional support. From an analysis of the study's findings, in conjunction with a review of the appropriate literature, a teacher professional development model for ICT integration has been developed that may be helpful in furthering the goal of successful ICT integration. This model focuses on the importance of intrinsic motivation rather than extrinsic incentives and is based on a developmental process in which individual teachers determine their own practice through peer support enhanced critical reflection that continually expands their personal context of ICT integration

Voices of Hope: Substance Use Peer Support in a System of Care

Peer support in substance use recovery assists individuals who seek long-term recovery by establishing supportive and reciprocal relationships that support the initiation and maintenance of recovery. Prior research has found that peer support workers provide essential services to individuals in recovery, while the experience of the peer and their integration into a system of care has yet to be fully explored. This qualitative study explored the peer worker’s experience as a provider of recovery support services in a system of care. Semi-structured interviews were conducted with 10 peer support workers. The interviews were transcribed and analyzed using qualitative data analysis software. Thematic analysis was used to identify themes and patterns inductively from the data. Peer support worker experiences included challenges establishing credibility, frustrations in managing systemic barriers, a lack of understanding as to what the role of peer worker entails by stakeholders, and skepticism from other providers about the value of the position. Positive experiences included a decrease in the perception of stigma about substance use and feeling valued. Supervision played a key role in the success of the peer worker role, with concerns related to supervisors who are not in recovery. This study highlighted improvements in the integration of peer support workers in systems of care and regard for the role by professionals. A widespread understanding of the role and scope of practice is lacking and a need for better support for the role through avenues such as training, and supervision exists

The Inclusion of other-sex peers in peer networks and sense of peer integration in early adolescence : a two-wave longitudinal study

The main goal of the analysis presented in this paper is to examine the dynamics of including other-sex peers in the peer networks of early adolescents, aged 11 (at T1) and 13 (at T2), and the relationship between sex heterophily and changes in the sense of peer integration. The analysis was conducted using the Latent Difference Score (LDS) model with data from a representative nationwide longitudinal study in Poland (n = 5748). With reference to the dynamics related to the heterophilic process, the research confirmed that at the beginning of grade 5 of primary school, heterophily is still relatively rare, yet towards the end of early adolescence, there is a gradual shift, more strongly in girls, towards breaking through the strictly same-sex segregation and embarking on heterophilic relationships. Importantly, the LDS model-even when controlling for different measures of peer network—showed significant and positive (among both girls and boys) relations between establishing cross-sex relationships and the sense of peer integration. The results indicate that the appearance of the opposite sex in the peer network between grades 5 and 6 will improve the sense of peer integration. The findings are discussed in relation to results from other studies in the field