71 results for Hinze, Annika, Conference item

  • 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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  • 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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  • Patient-based mobile alerting systems- requirements and expectations

    Hinze, Annika; Jung, Doris (2005)

    Conference item
    University of Waikato

    Patients with chronic conditions are not well supported by technical systems in managing their conditions. However, such systems could help patients to self-reliantly comply with their treatment. This help could be rendered in the form of alerting patients about condition-relevant issues, transmitting relevant parameters to healthcare providers and analysing these parameters according to guidelines specified by both patients and healthcare staff. If necessary, this analysis of condition parameters triggers the alerting of patients and healthcare providers about actions to be taken. In this paper, we present the results of a survey we have undertaken to verify and extend requirements we have identified for the design of a Mobile Alerting System for patients with chronic conditions. First of all, the results show that a Mobile Alerting System is desired by patients. Moreover, due to the inter- and intra-user variance of patients and healthcare staff, the system has to work in a context-aware manner and allow for personalised parameters in order to be adaptable to every user’s needs.

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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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  • The digital parrot: Combining context-awareness and semantics to augment memory

    Schweer, Andrea; Hinze, Annika (2007)

    Conference item
    University of Waikato

    People of all ages and backgrounds are prone to forgetting information, even about their personal experiences. Existing systems to support people in remembering such information either continuously record a person’s experiences or provide means to store and retrieve clearly defined, isolated pieces of data. We propose a new approach: combining context-awareness with semantic information. We believe this approach to be superior to the existing systems in certain types of situations. This position paper introduces this approach and our own ongoing project, the Digital Parrot.

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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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  • TIP spatial index: efficient access to digital libraries in a context-aware mobile system

    Osborn, Wendy; Hinze, Annika (2012)

    Conference item
    University of Waikato

    We present a framework for efficient, uniform, location-based access to digital library collections that are external to a context-aware mobile information system. Using a tourist Information system, we utilize a spatial index to manage the context of location. We show how access to resources from within and outside of the tourist information system can be carried out in a seamless manner. We show how the spatial index can be navigated to continually provide information to the user. An empirical evaluation of the navigation strategy versus traditional spatial searching shows that navigation is efficient and outperforms traditional spatial search. In conclusion, our work provides a strategy for context-aware mobile systems to co-operate with digital libraries in a seamless and efficient manner.

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  • Travel recommendations in a mobile tourist information system

    Hinze, Annika; Junmanee, Saijai (2005-05-23)

    Conference item
    University of Waikato

    An advanced mobile tourist information system delivers information about sights and events on a tourists travel route. The system should be personalized in its interaction with the tourist. Data that can be used for personalization are: the tourists interest profile, an analysis of their travel history, and the tourists feedback about sights. Existing mobile information systems for tourists do not tailor their information delivery to the tourists interests. In this paper, we propose the use of personalised recommendations that consider all of the personal information a tourist provides. We adopt and modify techniques from recommended systems to the new application area of mobile tourist information. We propose a number of methods for personalised recommendations; and select a subset of these for implementation. This paper then presents the implemented recommended component of our TIP system for mobile tourist information

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  • A distributed alerting service for open digital library software

    Hinze, Annika; Buchanan, George (2005)

    Conference item
    University of Waikato

    Alerting for Digital Libraries (DL) is an important and useful feature for the library users. To date, two independent services and a few publisher-hosted proprietary services have been developed. Here, we address the problem of integrating alerting as functionality into open source software for distributed digital libraries. DL software is one application out of many that constitute so-called meta-software: software where its installation determines the properties of the actual running system (here: the Digital Library system). For this type of application, existing alerting solutions are insufficient; new ways have to be found for supporting a fragmented network of distributed digital library servers. We propose the design and usage of a distributed Directory Service. This paper also introduces our hybrid approach using two networks and a combination of different distributed routing strategies for event filtering.

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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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  • Summer Universities for Women in Computer Science

    Oechtering, Veronika; Alder, Simone; Jolk, Friederike; Klempien-Hinrichs, Renate; Sohle, Bettina; Oelinger, Maria; Kreuzeder, Alexandra; Stiftinger, Anna; Hinze, Annika (2004)

    Conference item
    University of Waikato

    A cross-university approach will be discussed that reflects moneducation, networking, and gender oriented organizational reforms in university programs. The concept was developed in Germany in 1997 as a national approach. Each year “Informatica Feminale” (www. Informatica-feminale.de) attracts more than 70 female lectures from universities, research, or industry to give courses on all topics of computer science oriented to the existing university curricula. Participants are female students as well as women interested in further education. The approach has won an European award for best practice. Since 2003 Austria provides a similar project called the “ditact-women’s IT summer studies” (www.ditact.ac.at). Another project will be located in New Zealand in 2005 as the “Computing Women Conference” (www/ cwc.org.nz).

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  • Supporting Change-Aware Semantic Web Services

    Hinze, Annika (2005)

    Conference item
    University of Waikato

    The Semantic Web is not only evolving into a provider of structured meaningful content and knowledge representation, but also into a provider of services. While most of these services support external users of the SW, we focus on a vital service within the SW – change management and adaptation. Change is a ubiquitous feature of the SW. In this paper, we propose a service architecture that embraces and utilises change to provide higher quality services. We introduce pilot implementations of two supporting services within this architecture.

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  • Contrasting object-relational and RDF modelling in a Tourist Information System

    Hinze, Annika; Loeffler, Katja; Voisard, Agnès (2004)

    Conference item
    University of Waikato

    Advanced tourist information systems should deliver more than weakly-related static information about sights. Instead, semantically-rich information about sights (e.g., groups of sights with same characteristics) should be delivered to the mobile users. Furthermore, tourists should not be overwhelmed by a stream of superfluous data unrelated to their interest and location. Personalization of the information delivery to each traveller, together with his or her travel history, is therefore crucial. In this paper, we describe the lessons learned from developing the kernel of an advanced tourist information provider using a semantic network of sight-related information and considering the travellers' interest and travel route. The system is a combination of event notification services (publish/subscribe) and location-based services (LBS). For modelling all relevant data, two approaches are compared: a RDF-based model and an object-relational model.

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  • Context-awareness in mobile tourist information systems: challenges for user interaction

    Hinze, Annika; Buchanan, George (2005)

    Conference item
    University of Waikato

    Context in mobile tourist information systems is typically captured as the current location of the user. Few systems consider the user's interests or wider context of the sights. This paper explores ideas of how to model, observe, evaluate, and exploit a richer notion of context in this application area. We discuss the influence of such a richer context model on the user interaction for both the capturing of context and the context-aware user/device interactions.

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  • Optimizing Pub/Sub Systems by Advertisement Pruning

    Bittner, Sven; Hinze, Annika (2006)

    Conference item
    University of Waikato

    Supporting advertisements in large publish/subscribe services has an improving influence on the system scalability. The additional application of event routing optimizations based on subscriptions further increases the event throughput and decreases the memory usage of publish/subscribe systems. However, also advertisement-based optimizations can improve these system properties but have been widely neglected so far. In particular, no current optimizations are applicable to advertisements defined as arbitrary Boolean filter expressions. In this paper, we outline the final milestone on the way to practically support the arbitrary Boolean publish/subscribe model: We firstly develop a novel optimization approach, advertisement pruning, that is tailored to arbitrary Boolean advertisements. Secondly, we present a detailed evaluation of the optimization potential of this advertisement-based solution. We finally analyze the effects of additionally optimizing subscriptions on the advertisement pruning optimization.

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  • Advanced Recommendation Models for Mobile Tourist Information

    Hinze, Annika; Junmanee, Saijai (2006)

    Conference item
    University of Waikato

    Personalized recommendations in a mobile tourist information system suffer from a number of limitations. Most pronounced is the amount of initial user information needed to build a user model. In this paper, we adopt and extend the basic concepts of recommendation paradigms by exploiting a user’s personal information (e.g., preferences, travel histories) to replace the missing information. The designed algorithms are embedded as recommendation services in our TIP prototype. We report on the results of our analysis regarding effectiveness and performance of the recommendation algorithms. We show how a number of limiting factors were successfully eliminated by our new recommender strategies.

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  • Dimension-Based Subscription Pruning for Publish/Subscribe Systems

    Bittner, Sven; Hinze, Annika (2006)

    Conference item
    University of Waikato

    Subscription pruning has been proven as valuable routing optimization for Boolean subscriptions in publish/ subscribe systems. It aims at optimizing subscriptions independently of each other and is thus applicable for all kinds of subscriptions regardless of their individual and collective structures. The original subscription pruning approach tries to optimize the event routing process based on the expected increase in network load. However, a closer look at pruning-based routing reveals its further applicability to optimizations in respect to other dimensions. In this paper, we introduce and investigate subscription pruning based on three dimensions of optimization: network load, memory usage, and system throughput. We present the algorithms to perform prunings based on these dimensions and discuss the results of a series of practical experiments. Our analysis reveals the advantages and disadvantages of the different dimensions of optimization and allows conclusions about the suitability of dimension-based pruning for different application requirements.

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  • Compressing GPS data on mobile devices

    Lever, Ryan; Hinze, Annika; Buchanan, George (2006)

    Conference item
    University of Waikato

    In context-aware mobile systems, data on past user behaviour or use of a device can give critical information. The scale of this data may be large, and it must be quickly searched and retrieved. Compression is a powerful tool for both storing and indexing data. For text documents powerful algorithms using structured storage achieve high compression and rapid search and retrieval. Byte-stream techniques provide higher compression, but lack indexation and have slow retrieval. Location is a common form of context frequently used in research prototypes of tourist guide systems, location-aware searching and adaptive hypermedia. In this paper, we present an exploration of record-based compression of Global Positioning System (GPS) data that reveals significant technical limitations on what can be achieved on mobile devices, and a discussion of the benefits of different compression techniques on GPS data.

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

    Littlewood, Haley; Hinze, Annika; Vanderschantz, Nicholas Roy; 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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