To make rating predictions, one of the most commonly used approach in recommender systems is the latent factor model. Despite its popularity, one of its drawbacks is that it only makes use of numeric ratings but ignores other resources, such as review texts. McAuley et al. [1] proposed a general framework to employ both numeric ratings and review texts, and showed their model can outperform the...

BACKGROUND In 2000, 41 million people searched for medical information online. The quality of that information is unregulated, variable, and not well studied. OBJECTIVE To quantify and compare the numbers and types of Internet sites matched for 10 diverse skin conditions through different search systems. DESIGN Search strategies were performed at 6-month intervals via Netscape Navigator, us...

Although the concept of knowledge asset management is known for years, there are almost no methodologies that can help its implementation in companies. Even if we are focusing only on product related knowledge assets, we face the problems associated with the diversity of products and companies, and ambiguity and complexity of knowledge. This paper presents a framework methodology that specifies...

The cy<:101GOIJ01C identity, that 1 1-az 00 n=l (_1_) M(o:,n) 1 zn ' where M(a,n) = *-:L:dlnJ.L (~) ad, and J. L is the classical Mobius function , has several natural analogues. Polynomials in a of degree n related to M(a, n) in these identities share interesting properties with M(a, n). Many special cases are of combinatorial interest. 1. The Witt formula and a product expansion The function ...

Companies currently use product lines to enhance products qualities and to lower the development and marketing costs. Many approaches available to support product lines, but most of them fail to address safety critical requirements in their approaches. In this paper we present DOPLER, an approach to handle safety critical system requirements and the addition of new safety critical requirements,...

A graph product is the fundamental group of a graph of groups. Amongst the simplest examples are HNN groups and free products with amalgamation. The torsion and conjugacy theorems are proved for any group presented as a graph product. The graphs over which some graph product has a solvable word problem are characterised. Conditions are then given for the solvability of the word and order proble...

This paper studies the effects of product market competition on the explicit compensation packages that firms offer to their CEOs, executives and workers. We use a large sample of both traded and non-traded UK firms and exploit a quasi-natural experiment associated to an increase in competition. The sudden appreciation of the pound in 1996 implied different changes in competition for sectors wi...

The buzzword “open source software” is gaining in importance and popularity in public, and more and more people are interested in this phenomenon. Yet up until now most of the literature concerning open source has mainly dealt with the technical aspects of the software. The non-technical side, such as discussing the economic aspects in an overall concept, have been neglected thus far. This pape...

During the last decades, firms have deployed environmental sustainability practices. While most of these practices incur internally within a firm’s boundaries, collaboration with supply chain partners and sharing of information related to the environmental impact of a firm’s products and processes, namely environmental information, has been identified by many firms as essential in order to achi...

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