71 results for Hinze, Annika, Conference item

  • Keeping Track of the semantic Web: Personalized Event Notification

    Hinze, Annika; Evans, Reuben James Emmanuel (2006)

    Conference item
    University of Waikato

    The semantic web will not be a static collection of formats, data and meta-data but highly dynamic in each aspect. This paper proposes a personalized event notification system for semantic web documents (ENS-SW). The system can intelligently detect and filter changes in semantic web documents by exploiting the semantic structure of those documents. In our prototype, we combine the functionalities of user profiles and distributed authoring systems. Typically, both approaches would lack the ability to handle semantic web documents. This paper introduces the design and implementation of our event notification system for semantic web documents that handles the XML representation of RDF. We analyzed our prototype regarding accuracy and efficiency in change detection. Our system supports sophisticated change detection including partial deletion, awareness for document restructuring, and approximate filter matches.

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  • Efficient filtering of composite events

    Hinze, Annika (2003)

    Conference item
    University of Waikato

    Event Notification Services (ENS) are used in various applications such as remote monitoring and control, stock tickers, traffic control, or facility management. The performance issues of the filtering of primitive events has been widely studied. However, for a growing number of applications, the rapid notification about the occurrence of composite events is an important issue. Currently, the detection of composite events requires a second filtering step after the identification of the primitive components. In this paper, we propose a single-step method for the filtering of composite events. The method has been implemented and tested within our ENS prototype CompAS. Using our method, the filter response time for composite events is significantly reduced. Additionally, the overall performance of the event filtering has been improved.

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  • Alerting in a Digital Library environment - Do Channels meet the requirements?

    Faensen, Daniel; Hinze, Annika; Schweppe, Heinz (1998)

    Conference item
    University of Waikato

    An Alerting Service (AS) informs its clients about new information provided by several suppliers. Special interests of clients can be defined as profiles. In the context of digital libraries, suppliers are the providers of documents. Providers are typically scientific publishers. In this paper we assume, that the providers are known to the clients. A general model and architecture of an Alerting Service is given in [1]. Channel technology has been developed for broadcast of news and continous streams of data like stock rates. For the digital library enviroment a finer granularity in profile definition than for common broadcasting is needed. In contrast to broadcast services, publishing events of multiple providers have to be presented to each client in a uniform way. In this summary we evaluate how the two competing approaches of Channel technology, Netscape’s Netcaster [3] and Microsofts Active Channels [2] meet these requirements. To satisfy user’s needs events have to be filtered by more or less complex profiles, e. g. a set of documents (like journals), a list of keywords (selected arbitraryly or from a thesaurus) or a query in a full-fledged query language like STARTS [4]. An easy-to-use and powerful profile definition language is one requirement for an AS. The second is a unified view, that means splitting the n:m-relationship between providers and clients. The use of both technologies strongly depends on how the contents is to be filtered, i.e. how the user profile is to be defined.

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  • Using ontologies to reason about the usability of interactive medical devices in multiple situations of use

    Bowen, Judy; Hinze, Annika (2012)

    Conference item
    University of Waikato

    Formally modelling interactive software systems and devices allows us to prove properties of correctness about such devices, and thus ensure effectiveness of their use. It also enables us to consider interaction properties such as usability and consistency between the interface and system functionality. Interactive modal devices, that have a fixed interface but whose behaviour is dependent on the mode of the device, can be similarly modelled. Such devices always behave in the same way (i.e. have the same functionality and interaction possibilities) irrespective of how, or where, they are used. However, a user’s interaction with such devices may vary according to the physical location or environment in which they are situated (we refer to this as a system’s context and usage situation). In this paper we look at a particular example of a safety-critical system, that of a modal interactive medical syringe pump, which is used in multiple situations. We consider how ontologies can be used to reason about the effects of different situations on the use of such devices.

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  • Using physical clocks for replication in MANETs

    Scholz, Manuel; Bregulla, Frank; Hinze, Annika (2007)

    Conference item
    University of Waikato

    When update-anywhere data replication is performed in a MANET, operations on replicated data are often executed concurrently. To achieve a global total ordering of all operations, we propose a hybrid timestamp mechanism that combines physical clocks and logical timestamps. Our approach overcomes the ordering problem that arises from imprecisely synchronized physical clocks. We overlay the timestamps of operations with a grid of time-slots. To order the operations, we use physical clocks for operations in different time-slots and logical clocks for operations within the same time-slot. We prove that our method guarantees a total ordering when using an appropriate grid width.

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  • Evolving triggers for dynamic environments

    Trajcevski, Goce; Scheuermann, Peter; Ghica, Oliviu; Hinze, Annika; Voisard, Agnes (2006)

    Conference item
    University of Waikato

    In this work we address the problem of managing the reactive behavior in distributed environments in which data continuously changes over time, where the users may need to explicitly express how the triggers should be (self) modified. To enable this we propose the (ECA)2 – Evolving and Context-Aware Event-Condition-Action paradigm for specifying triggers that capture the desired reactive behavior in databases which manage distributed and continuously changing data. Since both the monitored event and the condition part of the trigger may be continuous in nature, we introduce the concept of metatriggers to coordinate the detection of events and the evaluation of conditions.

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  • A log analysis study of 10 years of ebook consumption in academic library collections

    Littlewood, Haley; Hinze, Annika; Vanderschantz, Nicholas; Timpany, Claire; Cunningham, Sally Jo (2014)

    Conference item
    University of Waikato

    Even though libraries have been offering eBooks for more than a decade, very little is known about eBook access and consumption in academic library collections. This paper addresses this gap with a log analysis study of eBook access at the library of the University of Waikato. This in-depth analysis covers a period spanning 10 years of eBook use at this university. We draw conclusions about the use of eBooks at this institution and compare the results with other published studies of eBook usage at tertiary institutes.

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  • Storing RDF as a Graph

    Bönström, Valerie; Hinze, Annika; Schweppe, Heinz (2003)

    Conference item
    University of Waikato

    RDF is the first W3C standard for enriching information resources of the Web with detailed meta data. The semantics of RDF data is defined using a RDF schema. The most expressive language for querying RDF is RQL, which enables querying of semantics. In order to support RQL, a RDF storage system has to map the RDF graph model onto its storage structure. Several storage systems for RDF data have been developed, which store the RDF data as triples in a relational database. To evaluate an RQL query on those triple structures, the graph model has to be rebuilt from the triples. In this paper, we presented a new approach to store RDF data as a graph in a object-oriented database. Our approach avoids the costly rebuilding of the graph and efficiently queries the storage structure directly. The advantages of our approach have been shown by performance test on our prototype implementation OO-Store.

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  • Tracking and re-finding printed material using a personal digital library

    Hinze, Annika; Dighe, Amay (2016)

    Conference item
    University of Waikato

    Most web searches aim to re-find previously known information or documents. Keeping track of one’s digital and printed reading material is known to be a challenging and costly task. We describe the design, implementation and evaluation of our Human-centred workplace (HCW) – a system that supports the tracking of physical document printouts. HCW embeds QR codes in the document printout, stores the documents in a personal Digital Library, and uses cameras in the office to track changes in the document locations. We explored the HCW in three evaluations, using the system over several weeks in an office setting, a user study in a lab environment, and extensive functional tests.

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  • Anonymous mobile service collaboration: Quality of service

    Hinze, Annika; Rinck, Michael; Streader, David (2010)

    Conference item
    University of Waikato

    Mobile services depend on user context and preferences, and a mobile user’s context is constantly changing. Many services are only available locally. The most appropriate service for a user’s context is not known in advance and a user may enter or leave a service’s range at any time. For a seamless user experience, services need to collaborate. These complex collaborations should be instantaneous yet anonymous – without disclosing user information. The paper proposes a new service collaboration model using event-based interaction. A prototypical implementation is used to demonstrate functionality, inter-operability, and generality of our solution. The solution guarantees ad-hoc service collaboration while protecting user information.

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  • Contextual queries express mobile information needs

    Hinze, Annika; Chang, Carole; Nichols, David M. (2010)

    Conference item
    University of Waikato

    The users of mobile devices increasingly use networked services to address their information needs. Questions asked by mobile users are strongly influenced by contextual factors such as location, conversation and activity. We report on a diary study performed to better understand mobile information needs. We find that the type of questions recorded by participants varies across their locations, with differences between home, shopping and in-car contexts. These variations occur both in the query terms and in the form of desired answers. Both the location of queries and the participants' activities affected participants' questions. When information needs were affected by both location and activity, they tended to be strongly affected by both factors. The overall picture that emerges is one of multiple contextual influences interacting to shape mobile information needs. Mobile devices that attempt to adapt to users' context will need to account for a rich variety of situational factors.

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  • Designing a mobile augmented memory system for people with traumatic brain injuries

    Chang, Carole; Hinze, Annika; Bowen, Judy; Starkey, Nicola J. (2014)

    Conference item
    University of Waikato

    Augmented memory systems help people remember events in their lives. Individuals with Traumatic Brain Injury (TBI) often have memory impairments. We conducted a user study to learn about strategies individuals with TBI use to remember events in their lives. We explored what characteristics individuals with TBI expect of an augmented memory system. We then investigated these aspects in an initial mobile app design, and propose here a concept for a rehearsal application that addresses the issues found in our studies.

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  • Improving access to large-scale digital libraries through semantic-enhanced search and disambiguation

    Hinze, Annika; Taube-Schock, Craig; Bainbridge, David; Matamua, Rangi; Downie, J. Stephen (2015)

    Conference item
    University of Waikato

    With 13,000,000 volumes comprising 4.5 billion pages of text, it is currently very difficult for scholars to locate relevant sets of documents that are useful in their research from the HathiTrust Digital Libary (HTDL) using traditional lexically-based retrieval techniques. Existing document search tools and document clustering approaches use purely lexical analysis, which cannot address the inherent ambiguity of natural language. A semantic search approach offers the potential to overcome the shortcoming of lexical search, but even if an appropriate network of ontologies could be decided upon it would require a full semantic markup of each document. In this paper, we present a conceptual design and report on the initial implementation of a new framework that affords the benefits of semantic search while minimizing the problems associated with applying existing semantic analysis at scale. Our approach avoids the need for complete semantic document markup using pre-existing ontologies by developing an automatically generated Concept-in-Context (CiC) network seeded by a priori analysis of Wikipedia texts and identification of semantic metadata. Our Capisco system analyzes documents by the semantics and context of their content. The disambiguation of search queries is done interactively, to fully utilize the domain knowledge of the scholar. Our method achieves a form of semantic-enhanced search that simultaneously exploits the proven scale benefits provided by lexical indexing.

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  • SEPSen: Semantic event processing at the sensor nodes for energy efficient wireless sensor networks

    Kasi, Mumraiz Khan; Hinze, Annika; Legg, Catherine; Jones, Steve (2012)

    Conference item
    University of Waikato

    Traditionally in WSNs, the sensor nodes are used only for capturing data that is then later analyzed in the more powerful gateway nodes. This requires a continuous communication that wastes energy at the sensor nodes and greatly reduces the overall network lifetime. We propose a semantic-based in-network data processing that reduces energy consumption and improves the scalability of heterogeneous sensor networks. Ontology fragments in each sensor node help identify the data routed through the sensor network. We have adapted a matching algorithm to process a changing knowledge base. Simulation results show that the networks' energy consumption is considerably reduced.

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  • Hermes: a notification service for digital libraries

    Faensen, Daniel; Faultstich, L.; Schweppe, Heinz; Hinze, Annika; Steidinger, A. (2001)

    Conference item
    University of Waikato

    The high publication rate of scholarly material makes searching and browsing an inconvenient way to keep oneself up-to-date. Instead of being the active part in information access, researchers want to be notified whenever a new paper in one's research area is published. While more and more publishing houses or portal sites offer notification services this approach has several disadvantages. We introduce the Hermes alerting service, a service that integrates a variety of different information providers making their heterogeneity transparent for the users. Hermes offers sophisticated filtering capabilities preventing the user from drowning in a flood of irrelevant information. From the user's point of view it integrates the providers into a single source. Its simple provider interface makes it easy for publishers to join the service and thus reaching the potential readers directly. This paper presents the architecture of the Hermes service and discusses the issues of heterogeneity of information sources. Furthermore, we discuss the benefits and disadvantages of message-oriented middleware for implementing such a service for digital libraries.

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  • Database systems as middleware- event, notifications, messages

    Schweppe, Heinz; Hinze, Annika; Faensen, Daniel (2000)

    Conference item
    University of Waikato

    Database systems have been traditionally used as integration tools. Data integration was the primary goal of first generation systems. After relational technology had become a mature base for application development, new architectures where developed for the tight integration of data, procedures and all kinds of processing. This phase of DBS research and development was dominated by object-oriented database management and specific architectures like Starburst [HaCH 1990], which had a strong impact on current object-relational technology. The ubiquitous computer network has added another facet to the usage of DBS as an integration tool. In distributed environment, middleware aims at making distribution transparent. Corba or RMI are well-known examples. The call-oriented style of communication has been complemented by message-oriented, event-driven interaction of independent programs. System processes use this type of communication for decades. However, it is not well known as a mechanism on the application level - despite the fact that it has been employed for quite some time, e.g. in workflow systems [LeRo 2000]. The event-driven message passing paradigm becomes more and more important for highly distributed applications. Many kinds of interactions between applications follow a common pattern: n inde-pendent providers submit their output as messages, which in turn will be consumed asynchronously by m consumer applications. As opposed to call-level interaction, providers and consumers may or may not know each others identity. In a stock ticker application for example, there is no reason why providers should know the identity of consumers.

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  • Issues in Location-Based Indexing for Co-operating Mobile Information Systems

    Osborn, Wendy; Hinze, Annika (2007)

    Conference item
    University of Waikato

    Mobile information systems need to collaborate with each other to provide seamless information access to the user. Information about the user and their context provides the points of contact between the systems. Location is the most basic user context. TIP is a mobile tourist information system that also provides location-based access to documents in the digital library Greenstone. This paper identifies the challenges for providing efficient access to location-based information using the various access modes a tourist requires on their travels. We discuss our extended 2DR-tree approach to meet these challenges.

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  • A Generic Alerting Service for Digital Libraries

    Buchanan, George; Hinze, Annika (2005-06-07)

    Conference item
    University of Waikato

    Users of modern digital libraries (DLs) can keep themselves up-to-date by searching and browsing their favorite collections, or more conveniently by resorting to an alerting service. The alerting service notifies its clients about new or changed documents. Proprietary and mediating alerting services fail to fluidly integrate information from differing collections. This paper analyses the conceptual requirements of this much-sought after service for digital libraries. We demonstrate that the differing concepts of digital libraries and its underlying technical design has extensive influence (a) the expectations, needs and interests of users regarding an alerting service, and (b) on the technical possibilities of the implementation of the service. Our findings will show that the range of issues surrounding alerting services for digital libraries, their design and use is greater than one may anticipate. We also show that, conversely, the requirements for an alerting service have considerable impact on the concepts of DL design. Our findings should be of interest for librarians as well as system designers. We highlight and discuss the far-reaching implications for the design of, and interaction with, libraries. This paper discusses the lessons learned from building such a distributed alerting service. We present our prototype implementation as a proof-of-concept for an alerting service for open DL software.

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  • Low-cost semantic enhancement to digital library metadata and indexing: simple yet effective strategies

    Hinze, Annika; Bainbridge, David; Cunningham, Sally Jo; Downie, J. Stephen (2016)

    Conference item
    University of Waikato

    Most existing digital libraries use traditional lexically-based retrieval techniques. For established systems, completely replacing, or even making significant changes to the document retrieval mechanism (document analysis, indexing strategy, query processing and query interface) would require major technological effort, and would most likely be disruptive. In this paper, we describe ways to use the results of semantic analysis and disambiguation, while retaining an existing keyword-based search and lexicographic index. We engineer this so the output of semantic analysis (performed off-line) is suitable for import directly into existing digital library metadata and index structures, and thus incorporated without the need for architecture modifications.

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  • Location- and time- based information delivery in tourism

    Hinze, Annika; Voisard, Agnès (2003)

    Conference item
    University of Waikato

    Today s mobile devices allow end users to get information related to a particular domain based on their current location, such as the fastest route to the nearest drugstore. However, in such Location-Based Services (LBS), richer and more targeted information is desirable. In many applications, end users would like to be notified about relevant events or places to visit in the near future according to their profile. They also do not wish to get the same information many times unless they explicitly ask for it. In this paper, we describe our system, TIP (Tourism Information Provider), which delivers various types of information to mobile devices based on location, time, profile of end users, and their history , i.e., their accumulated knowledge. The system hinges on a hierarchical semantic geospatial model as well as on an Event Notification System (ENS).

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