@conference {
	title = {Capability Assessment and Design Evaluation for the Hybrid Network of Space GiG and Terrestrial Sensor Nets: Global Monitoring, Tracking and Query},
	author = {Liu, Nelson X., Baras, John S.},
	year = {2004},
	month = {10/2004},
	abstract = {In this paper, we propose a hierarchical architecture for organizing the hybrid network of the LEO-satellite based space network and terrestrial sensor nets. The hybrid network has unique advantages in providing global monitoring, tracking, and query capabilities. We assess these three capabilities of the network, and seek the optimal design in terms of the cooperation of the MAC and routing protocols. We evaluate six combinations of the MAC and routing protocols, and identify the best solution. Extensive simulation results are provided, Application models and performance metrics for the three capabilities are developed. The work provides a reference framework for pursuing global monitoring, tracking, query capabilities with hybrid space-terrestrial networks.},
	address = {Monterey, California},
	booktitle = {MILCOM 2004},
	pages = {pp. 899-905}
}
@conference {
	title = {Providing Full Connectivity in Large Ad-Hoc Networks by Dynamic Placement of Aerial Platforms},
	author = {Chandrashekar, Karthikeyan., Raissi-Dekhordi, Majid., Baras, John S.},
	year = {2004},
	month = {10/2004},
	abstract = {In this paper, we address the problem of providing full connectivity to disconnected ground MANET nodes by dynamically placing unmanned aerial vehicles (UAVs) to act as relay nodes. We provide a heuristic algorithm to find the minim1 number of such aerial vehicles required to provide full connectivity and find the corresponding locations for these aerial platforms (UAVs). We also track the movement of the ground nodes and update the location of the UAVs. We describe a communication framework that enables the ground nodes to communicate with its peer ground nodes as well as the UAVs that act as relay nodes. The communication architecture is designed to work with existing MANET Routing Protocols.},
	address = {Monterey, California},
	booktitle = {MILCOM 2004},
	pages = {pp. 1429-1436}
}
@conference {
	title = {Rate of Degradation of Centralized Optimization Solutions and its Application to High Performance Domain Formation in Ad Hoc Networks},
	author = {Manousakis, Kyriakos., Baras, John S., McAuley, Anthony J., Morera, Raquel.},
	year = {2004},
	month = {10/2004},
	abstract = {Future military systems such a FCS and WIN-T require a robust and flexible network that supports thousands of ad hoc nodes; therefore, we must ensure the scalability of networking protocols (e.g., routing, security and QoS). The use of hierarchy is a powerful solution to the scaling problem~since it allows networking protocols to operate on a limited number of nodes, as opposed to the entire network. We have proposed an automated solution to dynamically create and maintain such hierarchy based on a combination of global optimization algorithms and local distributed maintenance protocols. Global optimization clearly improves performance in a static network but, it is unclear how effective it is in a dynamic ad hoc environment. In this paper, we analyze how the hierarchy created deteriorates from the optimal as network conditions change. We show that the fragility of the optimization depends on the particular cost function and the number of metrics that change. More important, we show, for the first time, that global optimization can remain effective for long periods with good cost functions, even in large dynamic ad hoc networks (where metrics may change rapidly due to node mobility and links making and breaking).~This result shows that, with fast optimization algorithms such as modified Simulated Annealing, future military systems can use global optimization to autoconfigure domains to significantly improve perform". We also show that local maintenance protocols support the global optimization mechanisms by extending the time the hierarchy remains feasible.},
	address = {Monterey, California},
	booktitle = {MILCOM 2004},
	pages = {pp. 1536-1542}
}
@conference {
	title = {Detection and Prevention of MAC Layer Misbehavior in Ad Hoc Networks},
	author = {Cardenas, Alvaro A., Radosavac, Svetlana., Baras, John S.},
	year = {2004},
	month = {10/2004},
	abstract = {Selfish behavior at the MAC layer can have devastating side effects on the performance of wireless networks, similar to the effects of DoS attacks. In this paper, we focus on the prevention and detection of the manipulation of the backoff mechanism by selfish nodes in 802.11. We first propose an algorithm to ensure honest backoffs when at least one, either the receiver or the sender is honest. Then we discuss detection algorithms to deal with the problem of colluding selfish nodes. Although we have focused on the MAC layer of 802.11, our approach is general and can serve as a guideline for the design of any probabilistic distributed MAC protocol.},
	address = {Washington DC},
	booktitle = {2nd ACM workshop on Security of ad hoc and sensor networks},
	pages = {pp. 17-22}
}
@conference {
	title = {TCP Splitting Protocol for Broadband Aeronautical Satellite Networks},
	author = {Shang, Yadong., Hadjitheodosiou, Michael., Baras, John S.},
	year = {2004},
	month = {10/2004},
	abstract = {In this paper, we recommend suitable transport protocols for an aeronautical network supporting Internet and data services via satellite. For the future IP-based aeronautical satellite hybrid network, we describe TCP protocol and focus on the problems that cause dramatically degraded performance of the Transport Protocol. Based on the observation that it is difficult for an end-to-end solution to solve these problems effectively, we propose a new TCP-splitting protocol, termed Aeronautical Transport Control Protocol (AeroTCP). The main idea of this protocol is to use a fixed window for flow control and one duplicated acknowledgment (ACK) for fast recovery. We also study the Gilbert-Elliott channel model for satellite channel since protocol behavior often depends strongly on the channel behavior. Our simulation results show that AeroTCP can maintain higher utilization for the satellite link than end-to-end TCP, especially in burst error-environment.},
	address = {Salt Lake City, Utah},
	booktitle = {23rd Digital Avionics Systems Conference (DASC)},
	pages = {pp. 11.C.3 (1-9)}
}
@conference {
	title = {Vision-Based Microtribological Characterization of Linear Microball Bearings},
	author = {Tan, Xiaobo., Modafe, Alireza., Hergert, R., Ghalichechian, N., Shapiro, B, Baras, John S., Ghodssi, R.},
	year = {2004},
	month = {10/2004},
	abstract = {Microball bearings can potentially provide robust and low friction support in micromachines such as micromotors and microgenerators. Their microtribological behavior needs to be investigated for design and control of such micromachines. In this paper a vision-based, non-intrusive measurement method is presented for characterization of friction in linear microball bearings. Infrared imaging is used to directly observe the dynamics of microballs and track the motion of bearing components. It is verified that microballs roll most of the time with occasional sliding or bumping resulting from fabrication nonuniformity. The friction-velocity curve demonstrates evident hysteresis. The dependence of frictional behavior on several factors is studied.},
	address = {Long Beach, California},
	booktitle = {ASME/STLE International Joint Tribology Conference (IJTC04)},
	pages = {pp. 1-6}
}
@conference {
	title = {ATEMU: A Fine-Grained Sensor Network Simulator},
	author = {Polley, Jonathan., Blazakis, Dionysus., McGee, Jonathan., Rusk, Dan., Baras, John S., Karir, Manish.},
	year = {2004},
	month = {10/2004},
	abstract = {In this paper we describe the design and implementation of ATEMU, a fine grained sensor network simulator. ATEMU is intended to bridge the gap between actual sensor network deployments and sensor network simulations. We adopt a hybrid strategy, where the operation of individual sensor nodes is emulated in an instruction by instruction manner, and their interactions with each other via wireless transmissions are simulated in a realistic manner. A unique feature of ATEMU is its ability to simulate a heterogeneous sensor network. Using ATEMU it is possible to not only accurately simulate the operation of different application on the MICA2 platform but also a complete sensor network where the sensor nodes themselves maybe based on different hardware platforms. In addition we also describe our implementation of XATDB, our front-end debugger/GUI for ATEMU. XATDB provides an excellent educational tool for people to start learning about the operation of sensor nodes and sensor networks, without requiring the purchase of actual sensor node hardware. The accuracy and emulation capabilities provided by ATEMU ensure that when and if actual hardware is used, the software will already have undergone rigorous testing and debugging on an accurate platform. This would provide the sensor network deployment community with a much more accurate estimate of the performance of various algorithms and protocols in realistic scenarios and platforms.},
	address = {Santa Clara, CA},
	booktitle = {First Annual IEEE Communications Society Conference on Sensor and Ad Hoc Communications and Networks},
	pages = {pp. 145-152}
}
@conference {
	title = {Trust Evaluation in Ad-Hoc Networks},
	author = {Theodorakopoulos, George., Baras, John S.},
	year = {2004},
	month = {10/2004},
	abstract = {An important concept in network security is trust, interpreted as a relation among entities that participate in various protocols. Trust relations are based on evidence related to the previous interactions of entities within a protocol. In this work, we are focusing on the evaluation process of trust evidence in Ad Hoc Networks. Because of the dynamic nature of Ad Hoc Networks, trust evidence may be uncertain and incomplete. Also, no pre-established infrastructure can be assumed. The process is formulated as a path problem on a directed graph, where nodes represent entities, and edges represent trust relations. Using the theory of semirings, we show how two nodes can establish an indirect trust relation without previous direct interaction. The results are robust in the presence of attackers. We give intuitive requirements for any trust evaluation algorithm. The performance of the scheme is evaluated on three topologies.},
	address = {Philadelphia, PA},
	booktitle = {2004 ACM workshop on Wireless security},
	pages = {pp. 1-10}
}
