@conference {
	title = {Network Cell Routing Model For Control of Throughput and Delay of Air Traffic},
	author = {Nguyen, Alex T., Baras, John S.},
	year = {2009},
	month = {10/2009},
	abstract = {Attempts to manage air traffic by either decreasing delay or increasing flow can have the reverse effect on the other. In the National Airspace System (NAS), flights typically depart at their chosen times, and flow management techniques are implemented in the air in an effort to maximize flow, which could lead to delay for individual aircraft. Other areas of the world allow flights to depart only at predetermined slot times knowing that there is a clear unobstructed path, leading to minimal delays but possibly under utilizing airspace. We propose a new approach in leveraging the highway cell transmission model (CTM) to the airspace in the form of a multi-objective optimization that trades between maximizing throughput and minimizing delay. The model is posed as a multi commodity traffic flow integer program where the constraints are relaxed slightly from the CTM to examine strategies for achieving optimal throughput and delay. In practice, the model is envisioned to initially run offline to determine a preliminary solution to the initial state of the system. Solutions for subsequent changes in actual state can be determined by running the model online for the incremental state change. Stochastic events such as convective weather clearing times or capacities can be included in the model to better see the benefits and impacts of pre-positioning traffic to take advantage of possible future clearing.},
	address = {Orlando, FL},
	booktitle = {28th Digital Avionics Systems Conference (DASC - 2009)},
	pages = {pp. 2.B.2-1 - 2.B.2-6}
}
@conference {
	title = {Modeling and Sensitivity Analysis of Reservation Based USAP Unicast Traffic in MANETs},
	author = {Perumal, Senni., Tabatabaee, Vahid., Baras, John S., Graff, Charles J., Yee, David G.},
	year = {2009},
	month = {10/2009},
	abstract = {In this paper, we develop and evaluate models to estimate and optimize various performance metrics for unicast traffic using the hard scheduling (virtual circuit connection oriented) mode of the reservation-based protocol USAP in mobile ad-hoc wireless networks (MANETs). USAP (Unifying Slot Assignment Protocol) is a dynamic distributed resource allocation protocol for MANETs. We model USAP hard scheduling mode using loss network models along with reduced link capacity that couple physical, MAC and routing layers effects. The key effect of multiuser interference on a link is modeled via reduced link capacity where the effects of transmissions and receptions in the link neighborhood are modeled using USAP reservation rules. We compare our results with simulation and obtain good results using our loss network models but with reduced link capacity distribution obtained by simulation. We also compute the throughput sensitivities with respect to network parameters and use these sensitivities to improve network performance.},
	address = {Boston, Massachusetts},
	booktitle = {MILCOM 2009 "The Challenge of Convergence"},
	pages = {pp.1-7}
}
@conference {
	title = {Component Based Modeling for Cross-layer Analysis of 802.11 MAC and OLSR Routing Protocols in Ad-hoc Networks},
	author = {Baras, John S., Tabatabaee, Vahid., Jain, Kaustubh.},
	year = {2009},
	month = {10/2009},
	abstract = {We present a complete scenario driven component based analytic model of 802.11 MAC and OLSR routing protocols in MANETs. We use this model to provide a systematic approach to study the network performance and cross-layer analysis and design of routing, scheduling, MAC, and PHY layer protocols. The routing protocol is divided into multiple components. Componentization is a standard methodology for analysis and synthesis of complex systems. To provide a component based design methodology, we have to develop a component based model of the wireless network that considers cross-layer dependency of performance. The component based model enables us to study the effect of each component on the overall performance of the wireless network and to design each component separately. For the MAC layer, we use a fixed point loss model of 802.11 protocol that considers effects of hidden nodes and finite retransmission attempts. We have also considered simple models for PHY and scheduling. The main focus of this paper is on the integration of these models to obtain a complete model for wireless networks. In several scenario driven studies, with user-specified topologies and traffic demands, we study the performance metrics - throughput and delay. By analyzing the performances under varying network scenarios, we are able to identify a few sources of performance degradation. We also study the effect of certain design parameters on the network performance. Thus, demonstrating the ability of the model to quickly identify problem components and try alternative design parameters},
	address = {Boston, Massachusetts},
	booktitle = {MILCOM 2009 \&quot;The Challenge of Convergence\&quot;},
	pages = {pp. 1-7}
}
@conference {
	title = {Securing the Communication of Medical Information Using Local Biometric Authentication and Commercial Wireless Links},
	author = {Ivanov, Vladimir I., Yu, Paul L., Baras, John S.},
	year = {2009},
	month = {10/2009},
	abstract = {Medical information is extremely sensitive in nature  a compromise, such as eavesdropping or tampering by a malicious third party, may result in identity theft, incorrect diagnosis and treatment, and even death. Therefore, it is important to secure the transfer of the medical information from its source, i.e., the patient, to the system that collects and records it or its technology adoption will face a strong resistance from the users. We consider the scenario where a patient has a portable, wireless medical device that transfers the medical information to a remote server. We decompose this problem into two sub-problems and propose security solutions to each of them: (a) to secure the link between the patient and the portable device, and (b) to secure the link between the portable device and the network. Thus, we push the limits of the network security to the cutting edge: authenticating the user using their biometric information, authenticating the device to the network at the physical layer, and strengthening the security of the wireless link with a key exchange mechanism. The proposed authentication methods can be used for recording the readings of medical data in a central database and for accessing medical records.},
	address = {Kalmar, Sweden},
	booktitle = {International Symposium on Health Information Management Research (ISHIMR 2009)},
	pages = {pp.119-127}
}
@conference {
	title = {Network Cell Air Traffic Routing Model For Control of Throughput and Delay},
	author = {Nguyen, Alex T., Baras, John S.},
	year = {2009},
	month = {10/2009},
	abstract = {Attempts to manage air traffic by either decreasing delay or increasing flow can have the reverse effect on the other. In the National Airspace System (NAS), flights typically depart at their chosen times, and flow management techniques are implemented in the air in an effort to maximize flow, which could lead to delay for individual aircraft. Other areas of the world allow flights to depart only at predetermined slot times knowing that there is a clear unobstructed path, leading to minimal delays but possibly underutilizing airspace. We propose a new approach in leveraging the highway cell transmission model (CTM) to the airspace in the form of a multi-objective optimization that trades between maximizing throughput and minimizing delay. The model is posed as a multicommodity traffic flow integer program where the constraints are relaxed slightly from the CTM to examine strategies for achieving optimal throughput and delay. In practice, the model is envisioned to initially run offline to determine a preliminary solution to the initial state of the system. Solutions for subsequent changes in actual state can be determined by running the model online for the incremental state change. Stochastic events such as convective weather clearing times or capacities can be included in the model to better see the benefits and impacts of pre-positioning traffic to take advantage of possible future clearing.},
	address = {San Diego, CA},
	booktitle = {INFORMS 2009},
	pages = {2.B.2-1 - 2.B.2-6}
}
