The Location API for J2ME is a standard Java mobile client API that is intended to provide a generic interface to multiple positioning technologies. Its client side object model goes beyond the provision of raw locati...
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ISBN:
(纸本)1595931082
The Location API for J2ME is a standard Java mobile client API that is intended to provide a generic interface to multiple positioning technologies. Its client side object model goes beyond the provision of raw location data to enable geocoding and reverse geocoding of physical landmarks, utilising the mobile device's persistent storage. However this alone does not provide direct support for 'friend finder' type applications that encompass third party mobile devices. In this paper we propose some extensions to the Location API that would enable such applications to be supported in a client centric manner, and demonstrate the use of these extensions within a simulation environment Copyright 2006 acm.
We present an emotion recognition system based on a probabilistic approach to adaptive processing of Facial Emotion Tree Structures (FETS). FETS are made up of localized Gabor features related to the facial components...
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ISBN:
(纸本)1595931082
We present an emotion recognition system based on a probabilistic approach to adaptive processing of Facial Emotion Tree Structures (FETS). FETS are made up of localized Gabor features related to the facial components according to the Facial Action Coding System. The proposed model is an extension of the probabilistic based recursive neural network model applying in face recognition by Cho and Wong [1]. The robustness of the model in an emotion recognition system is evaluated by testing with known and unknown subjects with different emotions. The experiment results shows that the proposed model significantly improved the recognition rate in terms of generalization. Copyright 2006 acm.
We describe the experience and lessons learned from developing a range of electronic services for a specialist engineering company. We are using a custom workflow management system as the base for a range of services ...
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ISBN:
(纸本)1595931082
We describe the experience and lessons learned from developing a range of electronic services for a specialist engineering company. We are using a custom workflow management system as the base for a range of services which are offered via a multi-modal portal, using a language-based approach to extracting information from HTML forms, email, and SMS. We describe the email classification experiments we have carried out and discuss the development of customer services based on automatic email classification. Copyright 2006 acm.
Ubiquitous technologies, infrastructures, applications and services that operate across physical environments (e.g. neighbourhood, home, car etc) will soon be spanning all the different spheres of everyday life. Ubiqu...
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ISBN:
(纸本)1595931082
Ubiquitous technologies, infrastructures, applications and services that operate across physical environments (e.g. neighbourhood, home, car etc) will soon be spanning all the different spheres of everyday life. Ubiquitous computing places humans in the center of environments saturated with computing and wireless communications capabilities, yet gracefully integrated, so that technology recedes in the background of everyday activities. The ubiquitous computing world is largely defined by applications, which present an altogether new set of requirements. In order to assess the impact of ubiquitous computing and discover caveats as early in the adoption process as possible, we need to study and analyze working prototypes applied in real-life settings and scenarios. The special track on ubiquitous computing applications, now in its third year, provides a forum for the discussion of all types of ubiquitous computing applications and related specialized infrastructures built for the deployment of targeted applications. Individual papers place applications within their use context and introduce novel and appropriate interaction paradigms while at the same time addressing related technical and business aspects and consequently identify novel opportunities or constraints.
An important challenge faced by the developers of faulttolerant distributed systems is to build fault tolerance mechanisms that are reliable. To achieve the desired levels of reliability, the development of mechanisms...
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ISBN:
(纸本)1595931082
An important challenge faced by the developers of faulttolerant distributed systems is to build fault tolerance mechanisms that are reliable. To achieve the desired levels of reliability, the development of mechanisms for detecting and handling errors should be rigorous or formal. In this paper, we present an approach to modeling and verifying faulttolerant distributed systems that use exception handling as the main fault tolerance mechanism. The proposed approach is based on a formal model for specifying the structure of a system in terms of cooperating participants that handle exceptions in a coordinated manner. We use a medical control system as a case study to validate the proposed approach. Copyright 2006 acm.
This paper addresses the problem of computing least-cost-path surfaces for massive grid-based terrains. Our approach follows a modular design, enabling the algorithm to make efficient use of memory, disk, and grid com...
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ISBN:
(纸本)1595931082
This paper addresses the problem of computing least-cost-path surfaces for massive grid-based terrains. Our approach follows a modular design, enabling the algorithm to make efficient use of memory, disk, and grid computing environments. We have implemented the algorithm in the context of the GRASS open source GIS system and - using our cluster management tool - in a distributed environment. We report experimental results demonstrating that the algorithm is not only of theoretical and conceptual interest but also performs well in practice. Our implementation outperforms standard solutions as dataset size increases relative to available memory and our distributed solver obtains near-linear speedup when preprocessing large terrains for multiple queries. Copyright 2006 acm.
The cost of sending queries to a server is high for mobile ubiquitous hosts. To address this, we adopt query consolidation mechanism, by exploiting the knowledge of similar queries generated by neighboring hosts to th...
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ISBN:
(纸本)1595931082
The cost of sending queries to a server is high for mobile ubiquitous hosts. To address this, we adopt query consolidation mechanism, by exploiting the knowledge of similar queries generated by neighboring hosts to the server, especially in location-dependent applications. We propose a group-based query processing scheme, where group members axe close in location and moving direction, to collectively deliver the aggregate querying need from members to the server. A leader or boss elected within each group is responsible for gathering and consolidating data requests from members, within an adaptive query listening period. We conducted simulated experiments to study the performance improvement with our scheme. Copyright 2006 acm.
We solve the consensus problem using a new class of broad-casts that are very appropriate to ad-hoc networking: every broadcast message is eventually ensured to be garbage-collected, thus freeing buffers in the resour...
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ISBN:
(纸本)1595931082
We solve the consensus problem using a new class of broad-casts that are very appropriate to ad-hoc networking: every broadcast message is eventually ensured to be garbage-collected, thus freeing buffers in the resource-constrained mobile devices. We identify an impossibility result, the conditions in which a consensus protocol that assumes normal, message-keeping broadcasts can work using the new broadcast, and the adaptation such a protocol would require when these conditions do not hold. The cost of achieving quiescent consensus, estimated through simulations, is shown to be affordable for hosting practical dependable applications. Copyright 2006 acm.
Knowing tourists' individual preferences provides the possibility to offer personalized tours. The challenge is to capture these preferences using a mobile device. During a field study in Görlitz three method...
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ISBN:
(纸本)1595931082
Knowing tourists' individual preferences provides the possibility to offer personalized tours. The challenge is to capture these preferences using a mobile device. During a field study in Görlitz three methods for elicitation were evaluated by computing the correlation between the tourists' and the algorithms' rankings. The results served to clarify fundamental questions en route to develop a personal tour guide. 1) Is it possible to seed a general interest profile in the mobile context with all its distractions that allows the accurate prediction of actual rankings of sights? 2) Are the interest profiles sufficiently diverse to base personalized tours on individual interest profiles instead of interest prototypes? 3) How do personalized tours affect the spatial behavior of tourists, do they really visit a broader set of attractions than before? Analyzing the interest profiles gives an insight into their actual diversity, discusses their necessity and helps simulating an improved distribution of tourists at a destination. Copyright 2006 acm.
MPEG-7 has become a key standard to multimedia research in searching, filtering and retrieval. Understanding experiences of users when using MPEG-7-based tools is necessary if we are to improve how MPEG-7 metadata is ...
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ISBN:
(纸本)1595931082
MPEG-7 has become a key standard to multimedia research in searching, filtering and retrieval. Understanding experiences of users when using MPEG-7-based tools is necessary if we are to improve how MPEG-7 metadata is applied in practice. COSMOS-7 enables structured modeling and filtering of MPEG-7-compliant metadata for digital video. We describe two COSMOS-7 front end systems: COSMOSIS, for modeling digital video metadata, and the Filtering Manager, for filtering digital video metadata. We then present an empirical evaluation of these front end systems undertaken with a sample set of end users from a London, UK, theater company. Our results reveal that end users progress through a number of key stages when modeling and filtering video content. Copyright 2006 acm.
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