@conference {
	title = {Modeling and control of a magnetostrictive actuator},
	author = {Tan, Xiaobo., Baras, John S.},
	year = {2002},
	month = {12/2002},
	abstract = {The rate-dependent hysteresis existing in magnetostrictive actuators presents a challenge in control of these actuators. In this paper we propose a novel dynamical model for the hysteresis in a thin magnetostrictive actuator. The model features the coupling of the Preisach operator with an ordinary differential equation (ODE). We prove the well-posedness of the model, study the parameter identification methods, and propose an inverse control scheme. The effectiveness of the identification and inverse control schemes is demonstrated through experimental results.},
	address = {Las Vegas, Nevada},
	booktitle = {41st IEEE Conference on Decision and Control},
	pages = {pp. 866-872}
}
@conference {
	title = {On-line Detection of Distributed Attacks from Space-time Network Flow Patterns},
	author = {Baras, John S., Cardenas, Alvaro A., Vahid Ramezani},
	year = {2002},
	month = {12/2002},
	abstract = {Parametric and non-parametric change detection algorithms are applied to the problem of detecting changes in the direction of traffic flow. The directionality of the change in a network flow is assumed to have an objective or target. The particular problem of detecting distributed denial of service attacks from distributed observations is presented as a working framework. The performance of our change detection algorithms is evaluated via simulations.},
	address = {Orlando, Florida},
	booktitle = {23rd Army Science Conference}
}
@conference {
	title = {Routing Domain Autoconfiguration for more Efficient and Rapidly Deployable Mobile Networks},
	author = {Manousakis, Kyriakos., McAuley, Anthony J., Morera, Raquel., Baras, John S.},
	year = {2002},
	month = {12/2002},
	abstract = {One approach to achieving scalability in rapidly deployed dynamic networks, such as Future Combat Systems (FCS), is to automatically divide nodes into small (e.g., 30 node) interconnected IP domains and assigning each a routing protocol that best meets the domain{\textquoteright}s characteristics (Morera and McAuley, 2002). Although an attractive idea, it has not been tested. This paper* presents the first realization of domain autoconfiguration through extensions to the IP Autoconfiguration Suite (IPAS) (McAuley et al., 2001; McAuley et al., 2002; Cheng et al., 2002). While IPAS already configures and reconfigures information such as interface IP address and server locations, it assumes a single domain. We describe IPAS enhancements that support the automatic creation and configuration of multiple domains and describe a prototype implementation where interfaces are dynamically assigned to run different routing protocols. Finally, we show some initial performance results that show configuration time for even large (1000 node) sparse networks in a few seconds and small bandwidth overhead (a few hundred bytes per link).},
	address = {Orlando, Florida},
	booktitle = {23rd Army Science Conference}
}
@conference {
	title = {Two Level Hybrid key Scheme for Efficient Key Distribution in Mobile Ad-Hoc Networks},
	author = {Baras, John S., Striki, Maria.},
	year = {2002},
	month = {12/2002},
	abstract = {Military command and control require that information be communicated to the appropriate groups and only with the utmost security. At the same time the environment envisioned by the Objective Force is mobile ad-hoc and consists of a large number of heterogeneous nodes deployed in a hostile field of limited bandwidth and unreliable channels. The nodes of the network may present severe bandwidth, energy, capacity and processing constraints (vary from Satellites, PDAs, laptops, to GPS devices, cellphones and pagers). In this work we develop a secure, robust and scalable key management scheme for multicast communications. This service is very important in determining the security and efficiency of the network. It consists of key generation, entity authentication and key distribution. We assume that the nodes are already authenticated and focus on studying and developing key distribution techniques with the aim to achieve scalability and high performance of our key distribution framework without sacrificing the security level of the network. For that we need to reduce the total storage, communication and computation cost of the nodes, resulting from the key distribution protocol we apply to our network. The new key distribution framework we designed is a hierarchical, two-level hybrid key management scheme.},
	address = {Orlando, Florida},
	booktitle = {23rd Army Science Conference}
}
@conference {
	title = {Generic congestion control through network coordination},
	author = {Liu, Xicheng., Cheung, Cynthia., Baras, John S.},
	year = {2002},
	month = {11/2002},
	abstract = {With the rapid emergence of new services and the quick change of traffic in Internet, the widely used end-to-end congestion control scheme becomes insufficient. This paper proposes a new congestion control architecture based on the coordination among the core router the edge router, and the host. The core router notifies its immediately upstream nodes when it detects incipient congestion. Those nodes then constrain their sending rates to prevent congestion. No per-flow state information is maintained in routers. The application itself need not take care of the rate adaptation. The architecture provides a uniform solution accommodating both responsive and unresponsive traffic with trivial overhead. It reduces the packet loss to zero, and leads to higher network resource utilization. Response time to congestion is greatly reduced. The architecture has been implemented in the Linux kernel, Some preliminary experiments show its advantages.},
	address = {Singapore},
	booktitle = {8th International Conference on Communication Systems},
	pages = {pp. 903-907}
}
@conference {
	title = {Aggregation of heavy-tailed on-off flows is multifractal},
	author = {Liu, Xicheng., Baras, John S.},
	year = {2002},
	month = {11/2002},
	abstract = {We show that the aggregation of heavy-tailed on-off flows can exhibit multifractality in nature in addition to the well-known long-range dependency. Justifications are provided through analyzing the power density spectrum of a single on-off flow, calculating the multifractal spectrum of aggregated flows, and measuring the distributions of the increment process. Effects of the on and the off period on the multifractal behavior are examined. With a new understanding of the on-off model taking into account the TCP window-based control mechanism, possible roles of the TCP window size and the RTT in producing multifractal traffic are suggested.},
	address = {Singapore},
	booktitle = {8th International Conference on Communication Systems},
	pages = {pp. 578-582}
}
@conference {
	title = {Broadcast scheduling in information delivery systems},
	author = {Raissi-Dekhordi, Majid., Baras, John S.},
	year = {2002},
	month = {11/2002},
	abstract = {Information broadcasting is an effective method to deliver popular information packages to a large number of users in wireless and satellite networks. We address the problem of broadcast scheduling in the pull environment and try to solve this problem by formulating it as a dynamic optimization problem. This approach allows us to find a near-optimal scheduling policy, which we use as a benchmark to evaluate a number of other existing heuristic policies. Also, in addition to providing a solution for the usual case with Poisson arrivals and equal priority pages, our approach enables us to address extended versions of this problem with other arrival processes and with distinct weights assigned to different pages.},
	address = {Taipei, Taiwan},
	booktitle = {Global Telecommunications Conference, Taipei},
	pages = {pp. 2935-2939}
}
@conference {
	title = {TCP over GEO satellite hybrid networks},
	author = {Zhou, Xiaoming., Baras, John S.},
	year = {2002},
	month = {10/2002},
	abstract = {Broadcast satellite networks are going to play an important role in the global information infrastructure. Satellites can provide direct-to-user Internet services and as well as traffic trunks in the middle of the network. About 98\% of Internet traffic is TCP traffic. TCP works well in terrestrial fiber networks, but does not work well in satellite and in hybrid (satellite-terrestrial) networks. We analyze the problems that cause this degraded performance and review the solutions proposed in the literature. Because an end-to-end solution is difficult in the hybrid network, we propose a solution based on connection splitting. While much research has been done on improving TCP throughput for a single connection, we consider the case when multiple connections with different round trip times compete with each other. The crucial part of our scheme is the flow control algorithm at the hybrid gateways (i.e., the interfaces between the satellite and terrestrial networks). Because the end-to-end connection is split at the hybrid gateways, the data packets are buffered at the TCP layer rather than at the IP layer as in a normal router. Furthermore, the TCP layer not only buffers data waiting for transmission, but also buffers data transmitted but not yet acknowledged. The flow control algorithm should avoid stall caused by buffer exhaustion, guarantee fairness among all competing connections and maintain high utilization of the satellite link. A performance evaluation demonstrates that our scheme meets these requirements.},
	address = {Anaheim, CA},
	booktitle = {Military Communications Conference},
	pages = {pp. 29-34}
}
@conference {
	title = {Reliable multicast for flat hierarchy networks based on adaptive air caching},
	author = {Manousakis, Kyriakos., Baras, John S.},
	year = {2002},
	month = {10/2002},
	abstract = {The evolution of satellite networks in the commercial and military world has pushed the research community towards the solution of important problems related to this kind of networks. One of those important problems is how to design an efficient reliable multicast protocol in a network where there is no hierarchy involved, and the link presents characteristics like high propagation delay and high BER. The existing reliable multicast protocols cannot be applied in the case of flat hierarchy networks, since those are based on intermediate receivers and local recovery techniques. So, we introduce the air caching technique, which serves as a fast access memory that is realized on the air and contains packets for the recovery of corrupted or erroneous data packets at the receivers. In this paper we present some of the protocols that we designed and are based on air caching combined with FEC and ARQ. In the past[7] we have presented protocols that are based on those techniques but the characteristics of the Air Cache were constant. In this paper we propose RM protocols, which are based on adaptive air caching, where the size and/or content of the Air Cache change dynamically based on feedback information. Our goal is to improve the delay and/or bandwidth usage characteristics of the non-adaptive Air Cache RM protocols.},
	address = {Anaheim, CA},
	booktitle = {IEEE Military Communications Conference MILCOM},
	pages = {pp. 1295-1299}
}
@conference {
	title = {Intrusion Detection with Support Vector Machines and Generative Models},
	author = {Baras, John S., Rabi, Maben.},
	year = {2002},
	month = {09/2002},
	abstract = {This paper address the task of detecting intrusions in the form of malicious attach on programs running OD a host computer system by inspecting the trace of system calls made by these programs. We use {\textquoteright}attack-tree{\textquoteright} type generative models for such intrusions to select features that are used by a Support Vector Machine Classifier. Our approach combines the ability of an HMM generative model to handle variable-length strings, i.e. the traces, and the non-asymptotic nature of Support Vector Machines that permits them to work well with small training sets.},
	address = {Sao Paulo, Brazil},
	booktitle = {5th International Conference, ISC 2002, Springer lecture notes in Computer Science (LNCS)},
	pages = {pp 32-47}
}
@conference {
	title = {INORA-A Unified Signaling and Routing Mechanism for QoS Support in Mobile Ad Hoc Networks},
	author = {Dharmaraju, Dinesh., Roy-Chowdhury, Ayan., Hovareshti, Pedram., Baras, John S.},
	year = {2002},
	month = {08/2002},
	abstract = {Mobile Ad hoc NETworks(MANET) are characterized by bandwidth constrained wireless links, multiple hops and highly dynamic topologies. Providing QoS support in MANETs is hence a challenging task. This paper presents the design, implementation and evaluation of INORA, which is a network layer QoS support mechanism that makes use of the INSIGNIA in-band signaling mechanism and TORA routing protocol for MANETs. TORA provides multiple routes between a given source and destination. We present an effective coupling between TORA and INSIGNIA to get routes that are {\textquotedblleft}best-able{\textquotedblright} to provide QoS requirements for a flow. INORA also combines congestion control with routing},
	address = {Vancouver, Canada},
	booktitle = {International Conference on Parallel Processing Workshops},
	pages = {pp. 86-93},
	organization = {British Columbia}
}
@conference {
	title = {Tool wear estimation from acoustic emissions: a model incorporating wear-rate},
	author = {Varma, Sudhir., Baras, John S.},
	year = {2002},
	month = {08/2002},
	abstract = {Almost all prior work on modeling the dependence of acoustic emissions on tool wear have concentrated on the effect of wear-level on the sound. We give justification for including the wear-rate information contained in the sound to improve estimation of wear. A physically meaningful model is proposed which results in a hidden Markov model (HMM) whose states are a combination of the wear-level and rate and observations are the feature vectors extracted from the sound. We also present an efficient method for picking feature vectors that are most useful for the classification problem.},
	address = {Quebec City, CA},
	booktitle = {16th International Conference on Pattern Recognition},
	pages = {pp. 492-495}
}
@conference {
	title = {Combined Research and Curriculum Development in Information centric Systems Engineering},
	author = {Austin, Mark A., Baras, John S., Kositsyna, N. I.},
	year = {2002},
	month = {07/2002},
	abstract = {This paper describes a multidisciplinary program of research and curriculum development in Information-Centric Systems Engineering currently underway at the Institute for Systems Research, University of Maryland, College Park. This work is supported by a significant grant from the National Science Foundation and industrial funds from US industry. After motivating the need for an information-centric approach to systems engineering education, this paper describes the research methodology, pathway from research to curriculum development and teaching, and architecture for web-based project deliverables.},
	address = {Las Vegas, Nevada},
	booktitle = {12th Annual INCOSE Symposium}
}
@conference {
	title = {Dynamic Adaptive Routing in MANETs: New Algorithms Using Swarm Intelligence},
	author = {Baras, John S.},
	year = {2002},
	month = {07/2002},
	address = {Adelphi, Maryland},
	booktitle = {Distinguished Lecture, Army Research Laboratory, }
}
@conference {
	title = {Dynamic Resource Allocation in Next Generation High Data Rate (Ka-Band) Satellites},
	author = {Baras, John S.},
	year = {2002},
	month = {06/2002},
	booktitle = {2002 Workshop on High Speed Networks, part of Infocom 2002}
}
@conference {
	title = {Alternative Network Architectures for Supporting Communications From the International Space Station},
	author = {Nguyen, Alex T., Hadjitheodosiou, Michael., Baras, John S.},
	year = {2002},
	month = {05/2002},
	abstract = {In order to support the communications needs of the International Space Station (ISS), alternative communications architectures to provide broadband support need to be considered. We address three communications options and evaluate an architecture for the direct to ground option, which could serve as an intermediary solution to satisfy near term communications needs of commercial experiments and payloads on the ISS and overcome certain limitations of the current ISS communications infrastructure. We focus on a particular user{\textquoteright}s requirements, and examine the system{\textquoteright}s communications links, and coverage availability. These parameters, along with high-level cost estimates, are compared to using commercial relay satellites, and an enhanced TDRSS. The direct to ground option is viable for store-and-forward applications and cost comparable to commercial constellations, but TDRSS is the choice for realtime or continuous data applications.},
	address = {Quebec, Canada},
	booktitle = {20th AIAA International Communication Satellite systems Conference and Exhibit},
	pages = {pp. 1-10},
	organization = {Montreal}
}
@conference {
	title = {Cross-disciplinary Systems Issues in Undergraduate Engineering Education},
	author = {Baras, John S.},
	year = {2002},
	month = {05/2002},
	address = {Avchorage, Alaska},
	booktitle = {NSF Workshop on the Research Needs in the Modeling, Dynamics, Control and Monitoring of Complex Engineering Systems, part of the American Control Conference}
}
@conference {
	title = {Cross-Departmental Undergraduate Control and Systems Education},
	author = {Baras, John S.},
	year = {2002},
	month = {05/2002},
	address = {Anchorage, Alaska},
	booktitle = {2nd Automatic Control Conference}
}
@techreport {
	title = {A direct-to-ground architecture for supporting Commercial Communications from the International Space Station},
	author = {Nguyen, Alex T., Zhou, Xiangrong., Hadjitheodosiou, Michael.},
	year = {2002},
	month = {01/2002},
	abstract = {We outline the first steps of an effort to start defining a communications architecture for supporting broadband data communications from the International Space Station. We address three communications options and focus on a direct-to-ground architecture, which could serve as an intermediary solution to satisfy near-term communications needs of commercial experiments and payloads on the ISS and overcome certain limitations of the current ISS communications infrastructure. A high-level analysis of the architecture for the direct to ground option is performed, focusing on a particular user{\textquoteright}s requirements, communications links, and coverage availability. We also discuss system, mobility support and protocol issues that need to be addressed for this solution to be a feasible alternative.},
	address = {New York, NY}
}
@conference {
	title = {A direct-to-ground architecture for supporting commercial communications from the International Space Station},
	author = {Nguyen, Alex T., Zhou, Xiangrong., Hadjitheodosiou, Michael., Baras, John S.},
	year = {2002},
	month = {04/2002},
	abstract = {We outline the first steps of an effort to start defining a communications architecture for supporting broadband data communications from the International Space Station. We focus on a direct-to-ground architecture, which could serve as an intermediate solution to satisfy the near term communications needs of commercial experiments and payloads on the ISS and overcome certain limitations of the current ISS communications infrastructure. We address three communications options and evaluate an architecture for the direct-to-ground option, focusing on a particular user{\textquoteright}s requirements, communications links, and coverage availability. We also discuss system, mobility support and protocol issues that need to be addressed for this solution to be a feasible alternative.},
	address = {New York, NY},
	booktitle = {IEEE International Conference on Communications},
	pages = {pp. 2989-2993}
}
@conference {
	title = {On Trust Establishment in Mobile Ad-Hoc Networks},
	author = {Eschenauer, Laurent., Gligor, Virgil D., Baras, John S.},
	year = {2002},
	month = {04/2002},
	abstract = {We present some properties of trust establishment in mobile, ad-hoc networks and illustrate how they differ from those of trust establishment in the Internet. We motivate these differences by providing an example of ad-hoc network use in battlefield scenarios, yet equally practical examples can be found in non-military environments. We argue that peer-to-peer networks are especially suitable to solve the problems of generation, distribution, and discovery of trust evidence in mobile ad-hoc networks, and illustrate the importance of evaluation metrics in trust establishment.},
	address = {Cambridge, UK},
	booktitle = {10th International Workshop on Security Protocols},
	pages = {pp. 47-66}
}
@conference {
	title = {Optimal Control of Hysteresis in Smart Actuators: A Viscosity Solution Approach},
	author = {Tan, Xiaobo., Baras, John S.},
	year = {2002},
	month = {03/2002},
	abstract = {Hysteresis in smart materials hinders their wider applicability in actuators. The low dimensional hysteresis models for these materials are hybrid systems with both controlled switching and autonomous switching. In particular, they belong to the class of Duhem hysteresis models and can be formulated as systems with both continuous and switching controls. In this paper, we study the control methodology for smart actuators through the example of controlling a commercially available magnetostrictive actuator. For illustrative purposes, an infinite horizon optimal control problem is considered. We show that the value function satisfies a Hamilton-Jacobi-Bellman equation (HJB) of a hybrid form in the viscosity sense. We further prove uniqueness of the viscosity solution to the (HJB), and provide a numerical scheme to approximate the solution together with a sub-optimal controller synthesis method. Numerical and experimental results based on this approach are presented.},
	address = {Palo Alto, CA},
	booktitle = {5th International Workshop on Hybrid Systems: Computation and Control, Springer Lecture notes in Computer Science(LNCS)},
	pages = {pp.451-464}
}
@conference {
	title = {Stochastic Dynamic Models for Internet Traffic and Congestion Control},
	author = {Baras, John S.},
	year = {2002},
	month = {02/2002},
	address = {Atlanta, Georgia},
	organization = {Georgia Institute of Technology}
}
