Identifying Web Tables - Supporting a Neglected Type of Content on the Web

The abundance of the data in the Internet facilitates the improvement of extraction and processing tools. The trend in the open data publishing encourages the adoption of structured formats like CSV and RDF. However, there is still a plethora of unstructured data on the Web which we assume contain semantics. For this reason, we propose an approach to derive semantics from web tables which are still the most popular publishing tool on the Web. The paper also discusses methods and services of unstructured data extraction and processing as well as machine learning techniques to enhance such a workflow. The eventual result is a framework to process, publish and visualize linked open data. The software enables tables extraction from various open data sources in the HTML format and an automatic export to the RDF format making the data linked. The paper also gives the evaluation of machine learning techniques in conjunction with string similarity functions to be applied in a tables recognition task.Comment: 9 pages, 4 figure

Expressing the tacit knowledge of a digital library system as linked data

Library organizations have enthusiastically undertaken semantic web initiatives and in particular the data publishing as linked data. Nevertheless, different surveys report the experimental nature of initiatives and the consumer difficulty in re-using data. These barriers are a hindrance for using linked datasets, as an infrastructure that enhances the library and related information services. This paper presents an approach for encoding, as a Linked Vocabulary, the "tacit" knowledge of the information system that manages the data source. The objective is the improvement of the interpretation process of the linked data meaning of published datasets. We analyzed a digital library system, as a case study, for prototyping the "semantic data management" method, where data and its knowledge are natively managed, taking into account the linked data pillars. The ultimate objective of the semantic data management is to curate the correct consumers' interpretation of data, and to facilitate the proper re-use. The prototype defines the ontological entities representing the knowledge, of the digital library system, that is not stored in the data source, nor in the existing ontologies related to the system's semantics. Thus we present the local ontology and its matching with existing ontologies, Preservation Metadata Implementation Strategies (PREMIS) and Metadata Objects Description Schema (MODS), and we discuss linked data triples prototyped from the legacy relational database, by using the local ontology. We show how the semantic data management, can deal with the inconsistency of system data, and we conclude that a specific change in the system developer mindset, it is necessary for extracting and "codifying" the tacit knowledge, which is necessary to improve the data interpretation process

A machine learning approach for layout inference in spreadsheets

Spreadsheet applications are one of the most used tools for content generation and presentation in industry and the Web. In spite of this success, there does not exist a comprehensive approach to automatically extract and reuse the richness of data maintained in this format. The biggest obstacle is the lack of awareness about the structure of the data in spreadsheets, which otherwise could provide the means to automatically understand and extract knowledge from these files. In this paper, we propose a classification approach to discover the layout of tables in spreadsheets. Therefore, we focus on the cell level, considering a wide range of features not covered before by related work. We evaluated the performance of our classifiers on a large dataset covering three different corpora from various domains. Finally, our work includes a novel technique for detecting and repairing incorrectly classified cells in a post-processing step. The experimental results show that our approach deliver s very high accuracy bringing us a crucial step closer towards automatic table extraction.Peer ReviewedPostprint (published version

The future of technology enhanced active learning – a roadmap

The notion of active learning refers to the active involvement of learner in the learning process, capturing ideas of learning-by-doing and the fact that active participation and knowledge construction leads to deeper and more sustained learning. Interactivity, in particular learnercontent interaction, is a central aspect of technology-enhanced active learning. In this roadmap, the pedagogical background is discussed, the essential dimensions of technology-enhanced active learning systems are outlined and the factors that are expected to influence these systems currently and in the future are identified. A central aim is to address this promising field from a best practices perspective, clarifying central issues and formulating an agenda for future developments in the form of a roadmap

Online Sustainability Disclosure: Assessing Customer’s Influence And The Use Of Web As A Medium Of Communication Among The Public Listed Companies In Malaysia

Sejak dekad yang lalu, pelbagai isu alam sekitar, sosial dan ekonomi yang disebabkan oleh syarikat korporat telah menjejaskan kehidupan pelbagai pihak yang berkepentingan. Over the past decade, various environmental, social and economic issues caused by the corporate companies are affecting various stakeholders

An Online Tutor for Astronomy: The GEAS Self-Review Library

We introduce an interactive online resource for use by students and college instructors in introductory astronomy courses. The General Education Astronomy Source (GEAS) online tutor guides students developing mastery of core astronomical concepts and mathematical applications of general astronomy material. It contains over 12,000 questions, with linked hints and solutions. Students who master the material quickly can advance through the topics, while under-prepared or hesitant students can focus on questions on a certain topic for as long as needed, with minimal repetition. Students receive individual accounts for study and course instructors are provided with overview tracking information, by time and by topic, for entire cohorts of students. Diagnostic tools support self-evaluation and close collaboration between instructor and student, even for distance learners. An initial usage study shows clear trends in performance which increase with study time, and indicates that distance learners using these materials perform as well as or better than a comparison cohort of on-campus astronomy students. We are actively seeking new collaborators to use this resource in astronomy courses and other educational venues.Comment: 15 pages, 9 figures; Vogt, N. P., and A. S. Muise. 2015. An online tutor for general astronomy: The GEAS self-review library. Cogent Education, 2 (1

Museums as disseminators of niche knowledge: Universality in accessibility for all

Accessibility has faced several challenges within audiovisual translation Studies and gained great opportunities for its establishment as a methodologically and theoretically well-founded discipline. Initially conceived as a set of services and practices that provides access to audiovisual media content for persons with sensory impairment, today accessibility can be viewed as a concept involving more and more universality thanks to its contribution to the dissemination of audiovisual products on the topic of marginalisation. Against this theoretical backdrop, accessibility is scrutinised from the perspective of aesthetics of migration and minorities within the field of the visual arts in museum settings. These aesthetic narrative forms act as modalities that encourage the diffusion of ‘niche’ knowledge, where processes of translation and interpretation provide access to all knowledge as counter discourse. Within this framework, the ways in which language is used can be considered the beginning of a type of local grammar in English as lingua franca for interlingual translation and subtitling, both of which ensure access to knowledge for all citizens as a human rights principle and regardless of cultural and social differences. Accessibility is thus gaining momentum as an agent for the democratisation and transparency of information against media discourse distortions and oversimplifications

Digital Preservation Services : State of the Art Analysis

Research report funded by the DC-NET project.An overview of the state of the art in service provision for digital preservation and curation. Its focus is on the areas where bridging the gaps is needed between e-Infrastructures and efficient and forward-looking digital preservation services. Based on a desktop study and a rapid analysis of some 190 currently available tools and services for digital preservation, the deliverable provides a high-level view on the range of instruments currently on offer to support various functions within a preservation system.European Commission, FP7peer-reviewe

What Would You Ask to Your Home if It Were Intelligent? Exploring User Expectations about Next-Generation Homes

Ambient Intelligence (AmI) research is giving birth to a multitude of futuristic home scenarios and applications; however a clear discrepancy between current installations and research-level designs can be easily noticed. Whether this gap is due to the natural distance between research and engineered applications or to mismatching of needs and solutions remains to be understood. This paper discusses the results of a survey about user expectations with respect to intelligent homes. Starting from a very simple and open question about what users would ask to their intelligent homes, we derived user perceptions about what intelligent homes can do, and we analyzed to what extent current research solutions, as well as commercially available systems, address these emerging needs. Interestingly, most user concerns about smart homes involve comfort and household tasks and most of them can be currently addressed by existing commercial systems, or by suitable combinations of them. A clear trend emerges from the poll findings: the technical gap between user expectations and current solutions is actually narrower and easier to bridge than it may appear, but users perceive this gap as wide and limiting, thus requiring the AmI community to establish a more effective communication with final users, with an increased attention to real-world deploymen

Food Remittances: Rural-urban Linkages and Food Security in Africa

The need for a new research agenda Globally, the transfer of funds by migrants to their home countries or areas (cash remittances) is at an all-time high. By 2017, it is predicted to rise to US$500 billion – and there is a growing policy consensus that cash remittances can be mainstreamed into development. Equally, food remitting also has a role to play in urban and rural food security. Yet despite its importance, researchers and policymakers tend to ignore food remitting. The growing literature on rural-urban linkages highlights their complex, dynamic nature in the context of rapid urbanisation and growing rural-urban migration in Africa. Food remitting cannot be treated in isolation from the ‘complex web of relations and connections incorporating rural and urban dimensions and all that is in between’ (Tacoli, 2007). Yet the remitting of goods, and especially foodstuffs, across international boundaries and within countries has received little attention, particularly in Africa, where it seems that ‘transfers of food are invisible in the sense that they run within the family and outside market channels’ (Andersson Djurfeldt 2015a: 540). This report is aimed at researchers and policymakers interested in transforming rural-urban linkages and the implications for food security of rural and urban residents. The current rural-urban binary is arbitrary, outdated and unhelpful. At a time of rapid urbanisation in the South, a wider lens is needed: focusing on rural-urban linkages and moving beyond cash-based, market transactions to consider the bidirectional flows of goods – including food – and their impact on food security. This report contributes to the study of changing rural-urban linkages by: Expanding the geographic and thematic scope of research, Demonstrating the value of examining the links between informal food transfers and urban-based household food security, and Arguing for a new research and policy agenda focused on food remitting. Using case studies from Zimbabwe and Namibia, this report also demonstrates how lessons related to food remitting can be applied in other African contexts – and highlights the urgent need for a new research agenda. The report concludes with recommendations for policymakers and researchers. What are the main lessons? Rural-urban linkages in a rapidly urbanising world require much more attention from researchers and policymakers. As this report shows, several key findings have emerged from the existing literature on food remitting. The importance of bidirectional food remittances: Most studies overlook food remitting as a key link between rural and urban areas and food security. Understanding these linkages must move beyond cash-based, market transactions to consider bidirectional flows of goods, including foodstuffs, and their impact on food security. Concepts of the divided or stretched household (Francis, 2000) and multi-local household livelihoods (Andersson Djurfeldt, 2015a) should guide any analysis of the dynamics of food remitting. Cross-border migration and food remittances: Food remitting is an important livelihood strategy. Remittances across international boundaries are important to food security (Crush, 2013) and there is a massive informal trade in food in Africa. Internal migration and food remittances: Reciprocal rural-urban-rural remitting is ‘fundamental to the ability of poor urban households to survive’ (Frayne, 2004). Many urban migrant households rely on informal, non-marketed food from rural counterparts. But we still know little about what it means for rural food security in terms of food sent and received. Comparing rural-urban and urban-urban food remittances: For food-insecure households, food remittances from both rural and urban sources are important. In one study around a third of poor urban households received food remittances from outside the city the year before (Frayne et al., 2010). But while rural-urban food remitting was significant, urban-urban food remitting was greater still. This phenomenon suggests that we need a much more nuanced notion of linkages and flows. Frequency and types of food remitting: Frayne et al. (2010) also showed that households receiving food from another urban area did so far more often. This might suggest that urban-urban networks and support mechanisms are stronger than rural-urban ties. What impact this has on the food security of producers and purchasers requires additional research. Food remitters in rural areas: Rural-urban food flows tend to focus more on poor urban neighbourhoods and households and are important to food security. There is some evidence that better-off rural households remit more than their less well-off counterparts – and that the effects of food remitting are much more severe on poorer rural households. Food remittances can be seen as ‘social security’ (Andersson Djurfeldt and Wambugu, 2011) but also as having an important cultural dimension (Kuuire et al. 2013). Lessons from the Zimbabwe and Namibia case studies These case studies highlight different facets of food remitting with potentially broader applicability. The first, of Harare in Zimbabwe, looks at the significance of food remittances under conditions of extreme economic and political duress. It allows an assessment of the impact of macro-economic and political stability on food remitting. The Windhoek case study provides an important example of cash remittances for food remittances reciprocity. It also raises important hypotheses about food remittances that need further elaboration and testing, such as the relationship between urban poverty and the level of food remitting and whether the volume and frequency of food remitting is related to the strength of links between urban and rural residents. What are the main recommendations for researchers and policymakers? The massive global attention paid to cash remittances over the past decade provides a solid evidence base for policymaking and advocacy at international, regional and national levels. Policy prescriptions for maximising the flow and impacts of cash remittances on development are now legion and part of a growing policy consensus that remittances can be mainstreamed into development planning and the practices of the private sector, for the benefit of both senders and recipients, whether individuals, communities or whole countries. Yet no equivalent knowledge base or policy dialogue exists with regard to food remittances. A new research agenda and policy dialogue are urgently required relating to food remittances and urban and rural food security. Food remitting is a major research gap that demands much greater attention and a systematic, comparative programme of primary research. The case studies from Zimbabwe and Namibia in this report highlight how a deeper understanding of food remitting can be applied in other African contexts: the nature of rural-urban linkages under conditions of state failure and crisis (Zimbabwe) and the importance of reciprocal cash and food remittances for food security (Namibia). The notion of a rural-urban divide is outdated and oversimplifies the issues. Food remitting cannot be treated in isolation from the complex web of relations and connections between both rural and urban contexts. An extremely useful starting point is to explore how stretched or multi-nodal households drive and impact on food remitting at both urban and rural ends of the spectrum. Much additional research on this important, yet much-neglected, aspect of urban-rural linkages and informal cross-border transactions is urgently required. By drawing attention to the importance of food remittances for urban and rural food security and identifying the current knowledge gaps, this report creates a platform for the design of a new research agenda