Due to the importance of the accurate measurement of the real time clock (RTC) of high-end server systems such as multimedia server and video server systems during production, we propose the design and implementation ...
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ISBN:
(纸本)9780889866522
Due to the importance of the accurate measurement of the real time clock (RTC) of high-end server systems such as multimedia server and video server systems during production, we propose the design and implementation of an automatic measurement system which is adjustable to measure the error of the real time clock. Our design uses a higher clock rate, like 10MHz, which provides a clock reference with a high resolution in comparison withthe low clock rate of the real time clock of 32.768 KHz of the mainboard of a high-end server system. Withthe integration of the programming in a microprocessor, the modular CPLD design, the I/O and the interface circuits, we provide an inexpensive, accurate and easy to operate high-performance system for the RTC measurement in the high-end server systems on production lines. the measurement speed and the RTC accuracy are balanced to obtain high measurement efficiency for computer manufacturers. Withthis design the measurement time is adjusted and limited to within 20 seconds and RTC accuracy obtained to within +/- 0.1ppm, which betters our previous design whose accuracy stood at between +/- 11ppm and +/- 25ppm.
In this paper we survey the conferencing architectures in H.323 and SIP. We give a compact review of the H.323 framework and capture the current status of the emerging SIP conferencing architecture. Subsequently we pr...
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ISBN:
(纸本)0889864209
In this paper we survey the conferencing architectures in H.323 and SIP. We give a compact review of the H.323 framework and capture the current status of the emerging SIP conferencing architecture. Subsequently we present a qualitative comparison of the schemes under study. the evaluation criteria are scalability to large conference sizes and to large geographical dispersion of participants as well as adaptiveness to heterogeneity in media streams format and protocol implementation. Our findings suggest that both architectures have certain advantages and limitations. Wherever possible we propose measures to overcome the latter. Concluding, we propose future work to mitigate the identified gaps in the SIP conferencing framework.
this paper discusses the advantages and challenges of using multimodal and voice technologies for field data collection. Current developments in the multimodal, mobile, field data communications are discussed. VoiceXM...
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ISBN:
(纸本)0889864209
this paper discusses the advantages and challenges of using multimodal and voice technologies for field data collection. Current developments in the multimodal, mobile, field data communications are discussed. VoiceXML technology for speech-enabled information retrieval and input using natural speech over the phone is described. Two field prototype applications developed using this technology are also discussed, including speech-based inventory and time management services for field users. the author presents the results of performance studies for the prototypes and discusses the pilot usability study conducted on a group of potential users.
the internet plays a vital role in the tourism industry. But even though consumer rely on various web services for planning and booking their vacations, those are just the first steps of a trip which can be segmented ...
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ISBN:
(纸本)0889864209
the internet plays a vital role in the tourism industry. But even though consumer rely on various web services for planning and booking their vacations, those are just the first steps of a trip which can be segmented into three different but interconnected phases: planning, touring and reminiscing. A single point of access that transparently supports all the stages of a trip has not been developed yet. Consequently, after surveying existing tourist applications, the concept for a ubiquitous tourism platform is developed and presented in this paper. Being based on open source technologies, the concept enables the implementation of flexible and cost efficient systems while providing standards for the tourism-related information exchange that will increase the users benefit, boththe tourist and the information provider's.
By using BT technology and actual application built a sharing platform in CAN. the test result shows that the BT technologies is suitable and efficient in CAN, and can obtain good performance.
ISBN:
(纸本)0889865108
By using BT technology and actual application built a sharing platform in CAN. the test result shows that the BT technologies is suitable and efficient in CAN, and can obtain good performance.
We have developed a multipoint, multimediaconference tool, called FocusShare. It enables users to employ various focus sharing techniques for smooth and effective distance education and conferences. To share focus po...
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ISBN:
(纸本)0889864209
We have developed a multipoint, multimediaconference tool, called FocusShare. It enables users to employ various focus sharing techniques for smooth and effective distance education and conferences. To share focus points remotely, the tool supports linear zooming, focus+context display, and sharing of multiple pointers. Non-linear zooming and composition of different-quality videos are implemented as focus+context display. FocusShare is a scalable tool because it utilizes lPv6/lPv4 multicasting for group communication. this approach is efficient for multipoint conferences, especially on satellite networks or LANs. FocusShare has a modular design and the flexibility to extend its functionality. It allows users to have various conference configurations easily. It can utilize various codecs and input devices. It is thus adaptable to various computing environments and to various purposes.
this paper describes a distributed system which aggregates the unused and usually wasted processing capacity of idle workstations. the aggregation is achieved through the use of now ubiquitous internet infrastructure ...
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ISBN:
(纸本)0889864209
this paper describes a distributed system which aggregates the unused and usually wasted processing capacity of idle workstations. the aggregation is achieved through the use of now ubiquitous internet infrastructure and web technology. And, it delivers a powerful yet inexpensive execution environment for computationally intensive applications. the prototype system described here makes use of Sun Microsystems Jini technology, particularly JavaSpaces, along with Java Web Start, to produce a dynamic, flexible and reliable system. Two example applications used to evaluate the system are described: (a) the n-Queens. problem and (b) a parallel sorting (shearsort) application. the results of the evaluation clearly show that, for certain classes of applications, the system is capable of delivering significant performance.
As business processes become distributed and knowledge intensive, increasing support is needed to coordinate these processes on the internet. Processes in knowledge intensive environments integrate workflows, emergent...
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ISBN:
(纸本)0889864209
As business processes become distributed and knowledge intensive, increasing support is needed to coordinate these processes on the internet. Processes in knowledge intensive environments integrate workflows, emergent work and social interactions, and they continually change as the situation changes. Consequently process coordination must integrate ensure that all process participants are continually aware of what they must do as the situation changes. this paper proposes that software agents be used to coordinate such processes and defines the essential characteristics of such agents. these include open architecture for reusability and proactivity and generic agents to be combined into specific architectures. the paper describes a metamodel to identify generic agents and specify them in generic terms. the paper first describes a metamodel for defining collaborative systems and then describes an agent architecture based on this metamodel.
Scarce bandwidth and interferences in mobile ad-hoc networks yield the need for more efficient diffusion techniques than these employed on usual wired networks, especially in dense environments. In this paper, we comp...
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ISBN:
(纸本)0889864209
Scarce bandwidth and interferences in mobile ad-hoc networks yield the need for more efficient diffusion techniques than these employed on usual wired networks, especially in dense environments. In this paper, we compare some optimized flooding mechanisms that were proposed in view to gain enough performance and allow applications such as multimedia diffusion in an ad hoc environment. We namely present multi-point relay (MPR) flooding and gateway flooding. We investigate the matter theoretically via mathematical modelling, as well as practically via simulations. It is shown how well each of these techniques improve the diffusion performances: when the network is dense, 2/3 of the gateway nodes participate in the retransmissions, while the density of multi-point relay retransmitters is 1/v, where v is the node density.
In this contribution it is shown, that the possibilities for the future global management of automation-technical systems is to be increased by internet technologies. It is, in addition, possible to reduce the complex...
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ISBN:
(纸本)9780889866782
In this contribution it is shown, that the possibilities for the future global management of automation-technical systems is to be increased by internet technologies. It is, in addition, possible to reduce the complexity in handling such systems. this contribution describes an infrastructure for remote handling of electrical drives and their associated control environment. the architecture presented is based on "web technologies". A description is given of a prototype implementation called WebLAut at the Erlangen Chair of Information Technologies (LIKE). It will be presented by means of various scenarios on the simulation model.
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