Michael Macedonia, Michael Zyda, David Pratt, Paul Barham, and Seven Zeswitz, "NPSNET: A Network Software Architecture for Large Scale Virtual Environments", Presence, 3 (4), Fall 1994. Home/Search Document Details and Download
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Techniques for Mitigating Lag-Time When Joining Interest Groups in.. - Shi (2000) (Correct)
....the same experience. Distributed Virtual Environments (DVE) are seeing increased use for a wide range of applications, such as military battlefield simulations, education and training systems, virtual teleconferencing, collaborative modeling and engineering, and multi user networked video games [45, 50, 42, 11, 57, 26]. The trend of faster processors, more powerful computer graphics hardware and software packages, and higher capacity networks makes it possible for large scale distributed virtual environment to contain well over 100,000 dynamic entities [59] 1.3 Database Model of DVE One of the critical ....
.... messages exchanged between simulation nodes are called protocol data units (PDUs) When a late arriving participant is going to join the simulation, it has to listen for a while and accumulate knowledge about what has transpired in the simulation from the PDUs being 6 issued by other participants [42]. Even though the replicated database simulation model requires a more complex dynamic joining mechanism than the central server model does, it is still not difficult because the state of remote entities that needs to be reconstructed at the joining participant is static state (static state is ....
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M. Macedonia, M. Zyda, D. Pratt, P. Barham, and S. Zeswitz. NPSNET: A network software architecture for large-scale virtual environments. Presence, 3(4):265--287, Fall 1994.
Scalable Network Support for 3D Virtual - Shopping Mall Seunghyun (Correct)
....in detail. 3.1 Design Consideration 3.1.1 Scalability Interactive performace is one of key factors in multi user interactive systems such as a 3D virtual shopping mall. To support acceptable performance as the number of users increases, various relevant filtering schemes have been proposed [2, 4, 9]. The existing filtering mechanisms are mostly based on location proximity or object types (classes or organizations) by which participants are classified before starting a session. These approaches are not scalable because a user should receive all the messages generated by others nearby even ....
....with high fidelity, that is, every update message is sent to the others. Update messages are sent with low fidelity data to the users who do not share the interest, that is, every update message is not sent. In order to solve deterioration of interactive performance due to region partition [9], we apply the inter region interaction management scheme based on sub regions to a virtual shopping mall system. Based on distance and viewing direction, a user receives only messages from only users in its neighboring regions whom it is interested in instead of all users. The inter region ....
M. Macedonia, M. Zyda, D. Pratt, R. David, P. Barham, and S. Zeswitz, NPSNET: A Network Software Architecture for Large Scale Virtual Environments, Presence, Vol. 3, No. 4, Sep. 1994, pp. 265-287.
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....greater than a pre defined threshold, the player sends an update correcting the ghost in every station, at expense of extra processing requirements. DIS requires all objects to send periodic keep alive update messages even for the objects which do not move or are dead . B. NPSNET IV NPSNET IV [7, 8] is a prototype developed at the Department of computer Science at the Naval Postgraduate School in Monterrey, CA, USA in 1995. NPSNET IV was designed to comply with DIS 2.0.3. NPSNET IV included the use of IP Multicast with dynamic multicast groups reflecting a hexagonal partition of the Virtual ....
M. Macedonia, M. Zyda, D. Pratt, P. Barham & S. Zeswitz, "NPSNET: A Network Software Architecture for Large Scale Virtual Environments". Presence, 3(4), 265-287, 1994.
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....NPSNET defines an area of interest. Servers have to be placed at strategic points to allow e#cient operation of the system over a wide area network. Messages can only be e#ciently culled, if the server connection topology closely matches the wide area network topology, 2.3. 5 NPSNET NPSNET[55, 53, 54] is a descendant of SIMNET, probably one of the first and best known large scale VE systems. NPSNET and SIMNET both support the DIS protocol. The primary goal of both systems is the support of multi user battlefield simulations. While SIMNET uses broadcasting to send messages between clients, ....
Macedonia, M. R., Zyda, M. J., Pratt, D. R., Barham, P. T., and Zeswitz, S. NPSNET: A network software architecture for largescale virtual environment. Presence 3, 4 (1994), 265--287.
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....on improving scalability in NVEs. A key design issue in them is to reduce message exchange as much as possible in terms of number and size without harming the shared context and interactive performance. They have proposed various solutions to the scalability issues in terms of interest management [1, 4, 5, 6, 12, 14], communication architecture [3, 14] data replication [17] and concurrency control [22] ATLAS [10] is an ongoing project to support scalability in NVEs in terms of the four scalability issues. ATLAS is written in Java and C and runs on Windows and UNIX compatible operating systems to ....
....in them is to reduce message exchange as much as possible in terms of number and size without harming the shared context and interactive performance. They have proposed various solutions to the scalability issues in terms of interest management [1, 4, 5, 6, 12, 14] communication architecture [3, 14], data replication [17] and concurrency control [22] ATLAS [10] is an ongoing project to support scalability in NVEs in terms of the four scalability issues. ATLAS is written in Java and C and runs on Windows and UNIX compatible operating systems to incorporate with the various requirements of ....
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Macedonia, M., Zyda, M., Pratt, D., David, R., Barham, P. and Zeswitz, S. NPSNET: A Network Software Architecture for Large Scale Virtual Environments. Presence, Vol. 3, No.4, Fall 1994, 265-287.
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....multiple graphically represented users, 2D, 3D, audio and video objects for a wide range of applications ranging from shopping to health care [Doenges 96] NCVEs represent an active area of research and several systems. Several systems have been developed [Barrus 96, Capin 95, Carlsson 93, Macedonia 94, Ohya 95, Singh 95, Thalmann 95] varying greatly in networking solutions, scalability, application scope, user embodiment solutions, efforts to integrate natural video and or audio data. Nevertheless, whatever the network topology of the NCVE (client server, multicast, multiple servers, ....
Macedonia M.R., Zyda M.J., Pratt D.R., Barham P.T., Zestwitz, "NPSNET: A Network Software Architecture for Large-Scale Virtual Environments", Presence: Teleoperators and Virtual Environments, Vol. 3, No. 4, 1994.
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Macedonia M.R., Zyda M.J., Pratt D.R., Barham P.T., Zestwitz, "NPSNET: A Network Software Architecture for Large-Scale Virtual Environments", Presence: Teleoperators and Virtual Environments, Vol. 3, No. 4, 1994.
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M. R. Macedonia, M. J. Zyda, D. R. Pratt, P. T. Barham and S. Zeswitz. NPSNET: A Network Software Architecture for Large Scale Virtual Environments, Presence, 3(4). 265--287. 1994.
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M. R. Macedonia, M. J. Zyda, D. R. Pratt, P. T. Barham, and S. Zeswitz. Npsnet: A network software architecture for large scale virtual environments. Presence: Teleoperators and Virtual Environments, 3(4):265--287, Fall 1994.
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Macedonia, M., et. al. NPSNET: A Network Software Architecture for Large Scale Virtual Environments. In Presence, volume 3, Number 4, 1994. http://www-npsnet.cs.nps.navy.mil/npsnet/publications.html. 101
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Macedonia, Michael R., Zyda, Michael J., Pratt, Donald P., and Barham, Paul T., Zeswitz, Steven, "NPSNET: A Network Software Architecture for Large-Scale Virtual Environments", in Presence, Vol. 3, No. 4, Fall 1994, pp. 265-287, MIT Press.
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