Proceedings 22nd International Conference on Distributed Computing Systems Workshops
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The eSleeve: a novel wearable computer configuration for the discovery of situated information
- Trang 793-796
Describes work in progress on wearable computing configurations which provide audio and visual output based on the position and orientation of the user. We introduce the 'eSleeve'-a wearable wrist computer with position and heading sensors combined with a user interface employing speech recognition and a small display. Applications described include searching a database of locations, and implement......
#Wearable computers #Computer displays #Wrist #Computer interfaces #Wearable sensors #User interfaces #Speech recognition #Auditory displays #Application software #Visual databases
An event-driven system for distributed multimedia applications
- Trang 583-584
We propose an architecture for distributed multimedia applications based on an event-driven programming model. To avoid the synchronization problems inherent to multi-threaded programming, the proposed architecture is based on a single-threaded structure. Instead of multi-threading, we opted for the event-oriented approach allied to multiple communication channels with user-defined handling proced......
#Multimedia systems #Communication channels #Distributed computing #Application software #Computer architecture #Communication system control #Context modeling #Control systems #Streaming media #Computer science
PFTPD: an FTP proxy system to assure the freshness of files
- Trang 57-62
As more software is being developed and distributed via the Internet, the number of accesses to file servers, such as FTP servers or WWW servers, is increasing. To reduce concentrated access to the original file server, mirror servers which have the same directories and files as the original server stores have been introduced. However, inconsistency among mirror servers and the original server is ......
#Mirrors #Network servers #File servers #Web server #Internet #Telecommunication traffic #Linux #World Wide Web #Delay #IP networks
Intrinsic references in distributed systems
- Trang 675-680
The notion of intrinsic references, i.e. references based on the hash digest of the referent, is introduced and contrasted with that of physical references, where the referent is defined relative to the state of a physical system. A retrieval mechanism using intrinsic references, the Elephant Store, is presented. The use of intrinsic references in hierarchical data structures is discussed, and the......
#Cryptography #Electronic mail #Information retrieval #Uniform resource locators #Dictionaries #Data structures #Authentication #Digital signatures #Data security #Resource management
Separating introspection and intercession to support metamorphic distributed systems
- Trang 465-472
Many middleware platforms use computational reflection to support adaptive functionality. Most approaches intertwine the activity of observing behavior (introspection) with the activity of changing behavior (intercession). This paper explores the use of language constructs to separate these parts of reflective functionality. This separation and "packaging" of reflective primitives is intended to f......
#Middleware #Reflection #Computer networks #Distributed computing #Wireless networks #Prototypes #Java #Sockets #Mobile computing #Quality of service
Mobile push: delivering content to mobile users
- Trang 563-568
The increasing popularity of information services that rely on content delivery in mobile environments motivates the need for a mobile push service - an efficient and flexible content dissemination service that targets mobile users. We analyze the features of a mobile push service by investigating representative usage scenarios and propose an architecture for mobile content delivery systems. The a......
#Mobile computing #Routing #Distributed computing #Collaboration #Distributed information systems #Web and internet services #Traffic control #Collaborative work #Contracts #Quality of service
An efficient method to improve the quality of watermarked cover image
- Trang 267-271
In this paper, a general concept called the n+k/n method is introduced. In the n+k/n method, a special mapping function is defined to map an intermediate set with n+k bits into a n bit information set. In the embedding process, the intermediate set is embedded into a cover image rather than embedding the information set. If the distance between features of the cover image and the bits of the inter......
#Watermarking #Internet #Image quality #Data mining #Military computing #Information security #Computer science #Laboratories #Telecommunication computing #Military communication
Towards an access control mechanism for wide-area publish/subscribe systems
- Trang 516-521
The publish/subscribe communication model is increasingly considered for implementing middleware infrastructures for widely distributed applications. Scalability issues and routing algorithms of such systems have recently been the focus of intensive research. So far little attention has been given to the security and management issues. In current publish/subscribe systems, malicious publishers can......
#Access control #Subscriptions #Routing #Internet #Permission #Middleware #Scalability #Communication system security #Joining processes #Large-scale systems
QoS control of multimedia communication over wireless network
- Trang 336-340
In this paper QoS control of a real-time multimedia communication system under heterogeneous environments of wired and wireless networks is proposed. In our suggested system, as channel coding the FEC (forward error correction) method with Reed-Solomon coding is introduced to reduce the packet error rate on the wireless network. On the other hand, as source coding, transcoding methods including tr......
#Communication system control #Multimedia communication #Wireless networks #Forward error correction #Error analysis #Transcoding #Control systems #Real time systems #Multimedia systems #Channel coding
Efficient distribution-based event filtering
- Trang 525-532
Event notification services are used in various applications, for example, stock tickers, environmental monitoring, and facility management. Several filtering algorithms for such services have been proposed. The best performance results are achieved by tree-based algorithms. However to our knowledge existing algorithms do not consider the influence of event and profile distribution on the filter p......
#Filters #Clustering algorithms #Testing #Monitoring #Filtering algorithms #Prototypes #Environmental management #Software libraries #Logistics #Traffic control