@conference {
	title = {Integrated Management of Large Satellite-Terrestrial Networks},
	author = {Baras, John S., Ball, Mike., Roussopoulos, Nick., Jang, Kap D., Stathatos, Kostas., Valluri, Jaibharat.},
	year = {1997},
	month = {11/1997},
	abstract = {Hybrid communication networks provide an economically feasible and technologically efficient means to implement the global information infrastructure. The management of such heterogeneous networks is a critical market differentiator for telecommunications companies and a formidable technical task. In this paper we describe our efforts in the Center for Satellite and Hybrid Communications Networks, to design and implement an integrated network management system for such networks. The major accomplishments to date are the design and implement an integrated network management system for such networks. The major accomplishments to date are the design and implementations of an object oriented data model for hybrid networks consisting of satellite networks and terrestrial ATM networks; the extension of the system to hybrid networks with as many as 300,000 nodes; the development of browsing graphical tools so that mesh-connected graph networks (as opposed to tree networks) can be efficiently queried; specifically designed graphical widgets for displaying performance data continuously from the network management information database (MIB); extensions of the GUI to distributed operation including appropriate designs for consistency and concurrency between the GUI display and the network MIB;~storage and organization issues for performance data in the MIB; integration of configuration management and performancce management.},
	address = {Monterey, CA},
	booktitle = {MILCOM \&rsquo;97},
	pages = {383-387}
}
@conference {
	title = {Hierarchical, Layered Modeling and Performance Evaluation of Hybrid Communication Networks},
	author = {Baras, John S., Corson, Scott M., Jang, Kap D., Liu, Mingyan., Misra, Archan., Xie, Hui.},
	year = {1997},
	month = {11/1997},
	abstract = {Commercial and military networks are rapidly becoming hybrid networks;~that is interconnected wireless terrestrial, wireline terrestrial and satellite networks. There is a great need for software tools to design, model and also do performance analysis efficiently for such large heterogeneous networks. This is the topic addressed in this paper. The hybrid network modeling and performance evaluation tool is currently under development at the University of Maryland. The tool consists of an algorithmic structure and a software architecture. The algorithm is hierarchical in form, deriving its structure from that of the network which follows the network{\textquoteright}s routing hierarchy. At each level, a node represents a set of nodes at a lower level. The boundary of a node is characterized by a set of statistical models. The statistics and their parametric representations for the models of the level 1 nodes are obtained from the OPNET simulations which are run offline. The model defines procedures that convey modeling, simulation and performance data up and down the hierarchy of models. We consider the following performance metrics only: end-to-end delay, throughput, blocking probabilities, cell or packet loss rate. We describe algorithms based on loss network approximations and fast progressive solutions of resulting fixed point equations.},
	address = {Monterey, CA},
	booktitle = {MILCOM \&rsquo;97},
	pages = {1-5}
}
@conference {
	title = {Automated Network Fault Management},
	author = {Baras, John S., Ball, Mike., Gupta, Sandeep., Viswanathan, P., Shah, Parthiv.},
	year = {1997},
	month = {11/1997},
	abstract = {Future military communication will have a mixture of backbone terrestrial, sattelite and wireless terrestrial networks. The speeds of these networks vary and they are very heterogeneous. As networks become faster, it is not enough to do reactive fault management. Our approach combines proactive and reactive fault management. Proactive fault management is implemented by dynamic and adaptive routing. Reactive fault management is implented by a combination of a neural network and an expert system. The system has been developed for the X.25 protocol. Several fault scenarios were modeled and included in the study: reduced switch capacity, increased packet gneration rate of a certain application, disabled switch in the X.25 cloud, disabled links. We also modeled occurence of alarms including severity of the problem, location of the event and a threshold. To detect and identify faults we use both numerical data associated with the perfomance objects (attributes) in the MIB as well as SNMP traps (alarms). Simulation experiments have been performed in order to understand the convergence of the algorithms, the training of the neural networks involved and the G2/NeurOn-Line software environment and MIB design.},
	address = {Monterey, CA},
	booktitle = {MILCOM \&rsquo;97},
	pages = {pp. 1244- 1250}
}
@conference {
	title = {Fast Asymmetric Internet Over Wireless Satellite-Terrestrial Networks},
	author = {Baras, John S., Corson, Scott M., Papademetriou, Spyro., Secka, Isatou., Suphasindhu, Narin.},
	year = {1997},
	month = {11/1997},
	abstract = {We describe our recent work on the design and implementation of high perfomrnace Internet services over networks consisting of interconnected Direct Broadcast (Satellite) hosts and terrestrial wireless LANs with various capabilities. The network uses receive only satellite links for downstream data delivery and wireless and wireline terrestrial links for the upstream path. A key concept in our work is that of a hybrid terminal which is a PC connected to a DBS antenna and to the local wireless LAN. The hybrid terminal uses a modem connection for outgoing traffic while receiving incoming information through the VSAT.},
	address = {Monterey, CA},
	booktitle = {MILCOM \&rsquo;97},
	pages = {372-377}
}
