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The Uses Of Argument

Graph pattern matching is typically defined in terms of subgraph isomorphism, which makes it an np-complete problem. Moreover, it requires bijective functions, which are often too restrictive to characterize patterns in emerging applications. We propose a class of graph patterns, in which an edge denotes the connectivity in a data graph within a predefined number of hops. In addition, we define matching based on a notion of bounded simulation, an extension of graph simulation. We show that with this revision, graph pattern matching can be performed in cubic-time, by providing such an algorithm. We also develop algorithms for incrementally finding matches when data graphs are updated, with performance guarantees for dag patterns. We experimentally verify that these algorithms scale well, and that the revised notion of graph pattern matching allows us to identify communities commonly found in real-world networks.

Graph Pattern Matching.

The Child in America.

Purpose – The purpose of this paper is to evaluate and compare open source and proprietary discovery tools and find out how much discovery tools have achieved towards becoming the next generation catalog.Design/methodology/approach – The paper summarizes characteristics of the next generation catalog into a check‐list of 12 features. This list was checked against each of seven open source and ten proprietary discovery tools to determine if those features were present or absent in those tools.Findings – Discovery tools have many next generation catalog features, but only a few can be called real next generation catalogs. Federated searching and relevancy based on circulation statistics are the two areas that both open source and proprietary discovery tools are missing. Open source discovery tools seem to be bolder and more innovative than proprietary tools in embracing advanced features of the next generation catalog. Vendors of discovery tools may need to quicken their steps in catching up.Originality/val...

Evaluating and comparing discovery tools: how close are we towards next generation catalog?

Process mining techniques use event data to discover process models, to check the conformance of prede?ned process models, and to extend such models with information about bottlenecks, decisions, and resource usage. These techniques are driven by observed events rather than hand-made models. Event logs are used to learn and enrich process models. By replaying history on the model, it is possible to establish a precise relationship between events and model elements. This relationship can be used to check conformance and to analyze performance. For example, it is possible to diagnose deviations from the modeled behavior. The severity of each deviation can be quanti?ed. Moreover, the relationship established during replay and the timestamps in the event log can be combined to show bottlenecks. These examples illustrate the importance of maintaining a proper alignment between event log and process model. Therefore, we elaborate on the realization of such alignments and their application to conformance checking and performance analysis.

Replaying history on process models for conformance checking and performance analysis

Purpose – The purpose of this paper is to describe some of the problems and issues faced by online library catalogues. It aims to establish how libraries have undertaken the mission of developing the next generation catalogues and how they compare to new tools such as Amazon.Deign/methodology/approach – An expert study was carried out in January 2008 to evaluate six library catalogues (one traditional and five recently modernised) and compare them to Amazon.Findings – While the traditional catalogue has stayed far behind, the modernised catalogues have taken two different approaches in becoming the “next generation catalogue”. Two catalogues focused on improving functionality while two others decided to introduce Web/Library 2.0 trends first. At this point, none of the catalogues offer as vast a range of features as Amazon does, but one catalogue managed to surpass Amazon in some of the examined features.Research limitations/implications – The chosen set of tested catalogues may not be representative and ...

New generation of catalogues for the new generation of users: A comparison of six library catalogues

Since their beginnings, bibliographic information systems have been displaying results in the form of long, textual lists. With the development of new data models and computer technologies, the need for new approaches to present and interact with bibliographic data has slowly been maturing. To investigate how this could be accomplished, a prototype system, FrbrVis1, was designed to present work families within a bibliographic information system using information visualization. This paper reports on two user studies, a controlled and an observational experiment, that have been carried out to assess the Functional Requirements for Bibliographic Records FRBR-based against an existing system as well as to test four different hierarchical visual layouts. The results clearly show that FrbrVis offers better performance and user experience compared to the baseline system. The differences between the four hierarchical visualizations Indented tree, Radial tree, Circlepack, and Sunburst were, on the other hand, not as pronounced, but the Indented tree and Sunburst design proved to be the most successful, both in performance as well as user perception. The paper therefore not only evaluates the application of a visual presentation of bibliographic work families, but also provides valuable results regarding the performance and user acceptance of individual hierarchical visualization techniques.

Presenting bibliographic families using information visualization: Evaluation of FRBR-based prototype and hierarchical visualizations

Purpose – Despite the importance of bibliographic information systems for discovering and exploring library resources, some of the core functionality that should be provided to support users in their information seeking process is still missing. Investigating these issues, the purpose of this paper is to design a solution that would fulfil the missing objectives. Design/methodology/approach – Building on the concepts of a work family, functional requirements for bibliographic records (FRBR) and information visualization, the paper proposes a model and user interface design that could support a more efficient and user-friendly presentation and navigation in bibliographic information systems. Findings – The proposed design brings together all versions of a work, related works, and other works by and about the author and shows how the model was implemented into a FrbrVis prototype system using hierarchical visualization layout. Research limitations/implications – Although issues related to discovery and expl...

Presenting bibliographic families: Designing an FRBR-based prototype using information visualization

The paper originates from the idea that in the field of information visualization, positive user experience is extremely important if we wish to see users adopt and engage with the novel information visualization tools. Suggesting the use of product reaction card method to evaluate user experience, the paper gives an example of FrbrVis prototype to demonstrate how the results of this method could be analysed and used for comparing different designs. The authors also propose five dimensions of user experience (UX) that could be gathered from reaction cards and conclude that the results from reaction cards mirror and add to other performance and preference indicators.

Evaluation of information visualization techniques: analysing user experience with reaction cards

The lack of support for the FRBR model in current bibliographic standards has been a major bottleneck for the implementation and use of this model in library databases. In this paper we present solutions for coding FRBR structures using MARC and show that it is possible to code even more complex FRBR structures within the current format. This solution promises a migration path for library systems without losing the compatibility with existing standards.

Tanja Merčun

Papers

New generation of catalogues for the new generation of users: A comparison of six library catalogues

Presenting bibliographic families using information visualization: Evaluation of FRBR-based prototype and hierarchical visualizations

Presenting bibliographic families: Designing an FRBR-based prototype using information visualization

Evaluation of information visualization techniques: analysing user experience with reaction cards

Coding FRBR-structured bibliographic information in MARC