Weighted Word Pairs for query expansion

This paper proposes a novel query expansion method to improve accuracy of text retrieval systems. Our method makes use of a minimal relevance feedback to expand the initial query with a structured representation composed of weighted pairs of words. Such a structure is obtained from the relevance feedback through a method for pairs of words selection based on the Probabilistic Topic Model. We compared our method with other baseline query expansion schemes and methods. Evaluations performed on TREC-8 demonstrated the effectiveness of the proposed method with respect to the baseline.     

The tragedy of the digital commons

In the paper it is argued that bridging the digital divide may cause a new ethical and social dilemma. Using Hardin's Tragedy of the Commons, we show that an improper opening and enlargement of the digital environment (Infosphere) is likely to produce a Tragedy of the Digital Commons (TDC). In the course of the analysis, we explain why Adar and Huberman's previous use of Hardin's Tragedy to interpret certain recent phenomena in the Infosphere (especially peer-to-peer communication) may not be entirely satisfactory. We then seek to provide an improved version of the TDC that avoids the possible shortcomings of their model. Next, we analyse some problems encountered by the application of classical ethics in the resolution of the TDC. In the conclusion, we outline the kind of work that will be required to develop an ethical approach that may bridge the digital divide but avoid the TDC.     

Human resources for Big Data professions: A systematic classification of job roles and required skill sets

The rapid expansion of Big Data Analytics is forcing companies to rethink their Human Resource (HR) needs. However, at the same time, it is unclear which types of job roles and skills constitute this area. To this end, this study pursues to drive clarity across the heterogeneous nature of skills required in Big Data professions, by analyzing a large amount of real-world job posts published online. More precisely we: 1) identify four Big Data ‘job families’; 2) recognize nine homogeneous groups of Big Data skills (skill sets) that are being demanded by companies; 3) characterize each job family with the appropriate level of competence required within each Big Data skill set. We propose a novel, semi-automated, fully replicable, analytical methodology based on a combination of machine learning algorithms and expert judgement. Our analysis leverages a significant amount of online job posts, obtained through web scraping, to generate an intelligible classification of job roles and skill sets. The results can support business leaders and HR managers in establishing clear strategies for the acquisition and the development of the right skills needed to leverage Big Data at best. Moreover, the structured classification of job families and skill sets will help establish a common dictionary to be used by HR recruiters and education providers, so that supply and demand can more effectively meet in the job marketplace.     

Mergers and acquisitions in publishing, 1984–1988: Some public policy issues

Recently, foreign and U.S. corporations have purchased a significant number of U.S. publishers. If this consolidation continues, a small number of firms could dominate the publishing and information-processing industry in this nation and the world. Albert Greco outlines the pattern of mergers and acquisitions of U.S. publishing firms between 1984 and 1988; describes some theories explaining the increase in mergers and acquisitions; and examines some key public policy issues.     

Is microrheometry affected by channel deformation?

Microrheometry is very important for exploring rheological behaviours of several systems when conventional techniques fail. Microrheometrical measurements are usually carried out in microfluidic devices made of Poly(dimethylsiloxane) (PDMS). Although PDMS is a very cheap material, it is also very easy to deform. In particular, a liquid flowing in a PDMS device, in some circumstances, can effectively deform the microchannel, thus altering the flow conditions. The measure of the fluid relaxation time might be performed through viscoelasticity induced particle migration in microfluidics devices. If the channel walls are deformed by the flow, the resulting measured value of the relaxation time could be not reliable. In this work, we study the effect of channel deformation on particle migration in square-shaped microchannel. Experiments are carried out in several PolyEthylene Oxyde solutions flowing in two devices made of PDMS and Poly(methylmethacrylate) (PMMA). The relevance of wall rigidity on particle migration is investigated, and the corresponding importance of wall rigidity on the determination of the relaxation time of the suspending liquid is examined.     

Key workers and schools: meeting the needs of children and young people with disabilities

Across the world countries are advocating the education of children and young people with disabilities in mainstream schools. There is also increasing interest in developing effective coordination of the specialist services pupils with disabilities receive from different agencies. This is accompanied by growing recognition that such care coordination can positively influence the experience of inclusion for children and their families. However, while the literature of care coordination generally includes education as a core provider, there is little evidence on involvement of education professionals and the outcomes for children and schools. These issues are addressed by the findings reported here on the role of key workers in care coordination and their relationship with schools. The findings draw on interviews with professionals from seven key worker services across England and Wales, parents and carers who were recipients of these services and teachers in schools serving children supported by key workers. These interviews are part of a wider multi‐method study exploring the effectiveness and costs of different models of key worker services for disabled children. The data reveal the range of education and school issues addressed by key workers and the factors influencing their work with teachers. The benefits for children, families and schools of key worker involvement are identified and the implications for schools explored. Consideration is also given to the advantages and disadvantages of teachers themselves taking on the role of key workers. It is argued that key workers can improve home–school relationships, facilitate the contribution of teachers in inter‐agency working, enable mainstream schools to better meet the individual needs of pupils with disabilities and improve their inclusive practice.     

Demographics of scholarly publishing and communication professionals

Scholarly publishing plays a pivotal role in the dissemination of research. While a great deal is known about the companies active in this sector, we need to know more about the employees of the firms that edit, produce, market, and distribute today's scholarly books and journals. To achieve this goal, the researchers conducted an international survey in late 2014 and early 2015 of approximately 6,121 scholarly publishing employees in 33 nations. The researchers received 828 usable questionnaires. Some of the substantive findings about the respondents include: 90.79% identified themselves as white; 85.07% worked in scholarly publishing for more than 5 years; 60% held graduate or professional degrees; and 49% worked in editorial departments. Key suggestions include the need for annual surveys of this type and that the majority of scholarly publishing firms need to address the issue of diversity.     

Book Publishers Should Support Changes in the Office of the Copyright and the Register of the Copyright Office

The U.S. Copyright Office and the Register of Copyrights supervise a myriad of major functions, from recording a copyright to providing the U.S. Congress with reports and suggestions regarding the state of the law. Yet this office is part of the Library of Congress, which controls its budget and appoints the Register. Should the book publishing community support the creation of an Office of Copyrights as a separate agency of the U.S. Government? What can or should the book publishing community do to address these issues and questions? This article explores the development of the Copyright Office, the Register of Copyrights, and provides some suggestions and recommendations.     

The Kirtsaeng and SCI-HUB Cases: The Major U.S. Copyright Cases in the Twenty-First Century

There has been a plethora of substantive copyright cases in the history of the United States. Two of the most important cases in the last few years were: the Kirtsaeng case before the Supreme Court of the United States; and the SCI-HUB case before the United States District Court in the Southern District of New York. This paper addressed the key copyright issues raised in each case, including a discussion of relevant sections of the Copyright Law of the United States (17 U.S.C.) as well as suggestions the book and scholarly journal industries could consider addressing the insidious impact of copyright violations.     

Optimizing design and fabrication of microfluidic devices for cell cultures: An effective approach to control cell microenvironment in three dimensions

The effects of gradients of bioactive molecules on the cell microenvironment are crucial in several biological processes, such as chemotaxis, angiogenesis, and tumor progression. The elucidation of the basic mechanisms regulating cell responses to gradients requires a tight control of the spatio-temporal features of such gradients. Microfluidics integrating 3D gels are useful tools to fulfill this requirement. However, even tiny flaws in the design or in the fabrication process may severely impair microenvironmental control, thus leading to inconsistent results. Here, we report a sequence of actions aimed at the design and fabrication of a reliable and robust microfluidic device integrated with collagen gel for cell culturing in 3D, subjected to a predetermined gradient of biomolecular signals. In particular, we developed a simple and effective solution to the frequently occurring technical problems of gas bubble formation and 3D matrix collapsing or detaching from the walls. The device here proposed, in Polydimethylsiloxane, was designed to improve the stability of the cell-laden hydrogel, where bubble deprived conditioning media flow laterally to the gel. We report the correct procedure to fill the device with the cell populated gel avoiding the entrapment of gas bubbles, yet maintaining cell viability. Numerical simulations and experiments with fluorescent probes demonstrated the establishment and stability of a concentration gradient across the gel. Finally, chemotaxis experiments of human Mesenchymal Stem Cells under the effects of Bone Morphogenetic Protein-2 gradients were performed in order to demonstrate the efficacy of the system in controlling cell microenvironment. The proposed procedure is sufficiently versatile and simple to be used also for different device geometries or experimental setups.