The Experts below are selected from a list of 3687 Experts worldwide ranked by ideXlab platform
Michael Malcolm - One of the best experts on this subject based on the ideXlab platform.
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file system design for an nfs file server Appliance
USENIX Winter Technical Conference, 1994Co-Authors: Dave Hitz, Michael MalcolmAbstract:Network Appliance Corporation recently began shipping a new kind of Network server called an NFS file server Appliance, which is a dedicated server whose sole function is to provide NFS file service. The file system requirements for an NFS Appliance are different from those for a general-purpose UNIX system, both because an NFS Appliance must be optimized for Network file access and because an Appliance must be easy to use. This paper describes WAFL (Write Anywhere File Layout), which is a file system designed specifically to work in an NFS Appliance. The primary focus is on the algorithms and data structures that WAFL uses to implement Snapshotst, which are read-only clones of the active file system. WAFL uses a copy-on-write technique to minimize the disk space that Snapshots consume. This paper also describes how WAFL uses Snapshots to eliminate the need for file system consistency checking after an unclean shutdown.
Dave Hitz - One of the best experts on this subject based on the ideXlab platform.
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file system design for an nfs file server Appliance
USENIX Winter Technical Conference, 1994Co-Authors: Dave Hitz, Michael MalcolmAbstract:Network Appliance Corporation recently began shipping a new kind of Network server called an NFS file server Appliance, which is a dedicated server whose sole function is to provide NFS file service. The file system requirements for an NFS Appliance are different from those for a general-purpose UNIX system, both because an NFS Appliance must be optimized for Network file access and because an Appliance must be easy to use. This paper describes WAFL (Write Anywhere File Layout), which is a file system designed specifically to work in an NFS Appliance. The primary focus is on the algorithms and data structures that WAFL uses to implement Snapshotst, which are read-only clones of the active file system. WAFL uses a copy-on-write technique to minimize the disk space that Snapshots consume. This paper also describes how WAFL uses Snapshots to eliminate the need for file system consistency checking after an unclean shutdown.
D Verkest - One of the best experts on this subject based on the ideXlab platform.
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design of cam e leon a run time reconfigurable web camera
International Conference Workshop on Embedded Computer Systems: Architectures Modeling and Simulation, 2002Co-Authors: Dirk Desmet, Prabhat Avasare, Paul Coene, S Decneut, Filip Hendrickx, T Marescaux, Jeanyves Mignolet, R Pasko, Patrick Schaumont, D VerkestAbstract:This paper describes the design of a reconfigurable Internet camera, Cam-E-leon, combining reconfigurable hardware and embedded software. The software is based on the µClinux operating system. The Network Appliance implements a secure VPN (Virtual Private Network) with 3DES encryption and Internet camera server (including JPEG compression). The Appliance's hardware can be reconfigured at run-time by the client, thus allowing to switch between several available image manipulation functions. The reconfiguration information is retrieved from a reconfiguration server on the Network, thus allowing a flexible implementation of new services.The paper describes the hardware and software architecture of the platform, the run-time reconfiguration features of the platform including the integration of the platform in the Network, and the design process followed to implement the Appliance starting from a high-level executable specification.
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design of a secure intelligent and reconfigurable web cam using a c based system design flow
Asilomar Conference on Signals Systems and Computers, 2001Co-Authors: D Verkest, Dirk Desmet, Prabhat Avasare, Paul Coene, S Decneut, Filip Hendrickx, T Marescaux, Jeanyves Mignolet, R Pasko, Patrick SchaumontAbstract:This paper describes the design of a reconfigurable Internet camera, Cam-E-leon, combining reconfigurable hardware and embedded software. The software is based on the /spl mu/Clinux operating system. The Network Appliance implements a secure VPN (virtual private Network) with 3DES encryption and Internet camera server (including JPEG compression). The Appliance's hardware can be reconfigured at run-time by the client, thus allowing us to switch between several available image manipulation functions. This paper focuses on the design process used to implement the Appliance starting from a high-level executable specification.
Patrick Schaumont - One of the best experts on this subject based on the ideXlab platform.
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design of cam e leon a run time reconfigurable web camera
International Conference Workshop on Embedded Computer Systems: Architectures Modeling and Simulation, 2002Co-Authors: Dirk Desmet, Prabhat Avasare, Paul Coene, S Decneut, Filip Hendrickx, T Marescaux, Jeanyves Mignolet, R Pasko, Patrick Schaumont, D VerkestAbstract:This paper describes the design of a reconfigurable Internet camera, Cam-E-leon, combining reconfigurable hardware and embedded software. The software is based on the µClinux operating system. The Network Appliance implements a secure VPN (Virtual Private Network) with 3DES encryption and Internet camera server (including JPEG compression). The Appliance's hardware can be reconfigured at run-time by the client, thus allowing to switch between several available image manipulation functions. The reconfiguration information is retrieved from a reconfiguration server on the Network, thus allowing a flexible implementation of new services.The paper describes the hardware and software architecture of the platform, the run-time reconfiguration features of the platform including the integration of the platform in the Network, and the design process followed to implement the Appliance starting from a high-level executable specification.
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design of a secure intelligent and reconfigurable web cam using a c based system design flow
Asilomar Conference on Signals Systems and Computers, 2001Co-Authors: D Verkest, Dirk Desmet, Prabhat Avasare, Paul Coene, S Decneut, Filip Hendrickx, T Marescaux, Jeanyves Mignolet, R Pasko, Patrick SchaumontAbstract:This paper describes the design of a reconfigurable Internet camera, Cam-E-leon, combining reconfigurable hardware and embedded software. The software is based on the /spl mu/Clinux operating system. The Network Appliance implements a secure VPN (virtual private Network) with 3DES encryption and Internet camera server (including JPEG compression). The Appliance's hardware can be reconfigured at run-time by the client, thus allowing us to switch between several available image manipulation functions. This paper focuses on the design process used to implement the Appliance starting from a high-level executable specification.
H. G. Schulzrinne - One of the best experts on this subject based on the ideXlab platform.
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feature interactions in internet telephony end systems
2004Co-Authors: H. G. SchulzrinneAbstract:Internet telephony end systems can offer many services. Different services may interfere with each other, a problem which is known as feature interaction. The feature interaction problem has existed in telecommunication systems for many years. The introduction of Internet telephony helps to solve some interaction problems due to the richness of its signaling information. However, many new feature interaction problems are also introduced in Internet telephony systems, especially in end systems, which are usually dumb in PSTN systems, but highly functional in Internet telephony systems. Internet telephony end systems, such as SIP soft-agents, can run on personal computers. The soft-agents can then perform call control and many other functions, such as presence information handling, instant messaging, and Network Appliance control. These new functionalities make the end system feature interaction problems more complicated. In this paper, we investigate ways features interact in Internet telephony end systems and propose a potential solution for detecting and avoiding feature interactions. Our solutions are based on the Session Initiation Protocol (SIP) and the Language for End System Services (LESS), which is a markup language specifically for end system service creation.
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integrating internet telephony services
IEEE Internet Computing, 2002Co-Authors: Wenyu Jiang, H. G. Schulzrinne, Jonatha Lenno, Sankara Narayana, Kunda SinghAbstract:Cost savings and the ease of developing and adding new services have motivated great interest in Internet telephony, which integrates services provided by the Internet with the public switched telephone Network (PSTN). Internet telephony relies on several protocols, including the real-time transport protocol (RTP) for multimedia data transport and the session initiation protocol (SIP) or H.323 for establishing and controlling sessions. SIP can integrate with other Internet services, such as email, the Web, voice mail, instant messaging, conference calling, and multimedia collaboration. We have implemented a SIP-based software suite called the Columbia Internet extensible multimedia architecture (Cinema), which we installed and integrated with the existing private branch exchange (PBX) infrastructure in the computer science department at Columbia University. The Cinema environment provides interoperability with the PSTN, programmable Internet telephony services, and IP-based voice mail. It also integrates Web access and e-mail for unified messaging and supports multiparty multimedia conferencing. The setup lets us extend our PBX capacity and will eventually let us replace it while keeping our existing phone numbers. It also provides an environment in which we can easily add new services and features, including interoperation with existing multimedia tools, e-mail access from standard. telephones, Network Appliance control, and instant messaging support.
