@conference {
	title = {Modeling TDMA-Based USAP in JTRS MDL for Multicast and Unicast Traffic},
	author = {Perumal, Senni., Tabatabaee, Vahid., Baras, John S., Graff, Charles J., Yee, David G.},
	year = {2010},
	month = {10/2010},
	abstract = {In this paper, we develop loss network models for the hard scheduling mode (virtual circuit mode) of the reservation based USAP scheduling protocol as used in the Mobile Data Link (MDL) of the Joint Tactical Radio System (JTRS). These models are used to find performance metric estimates for both multicast and unicast traffic. USAP (Unifying Slot Assignment Protocol) is a dynamic distributed resource allocation protocol for mobile multihop wireless networks where the channel is partitioned in time and frequency. MDL creates a backbone sub-network and routes all traffic through this sub-network. For the backbone sub-network, we consider algorithms that form Connected Dominating Sets. We use loss network models that couple the physical, MAC, and routing layers effects. The effect of the MAC layer is modeled by approximating available capacity at a node. The available capacity to transmit is computed based on the USAP reservation rules and the node{\textquoteright}s 2-hop neighborhood traffic. For a given time varying scenario, we compute the performance metrics of blocking probability and throughput for both multicast and unicast traffic as a function of time. We compare the results of our model against simulation.},
	address = {San Jose, CA},
	booktitle = {2010 Military Communications Conference (MILCOM 2010)},
	pages = {pp. 1464-1469}
}
@conference {
	title = {Opportunistic Communications for Networked Controlled Systems of Autonomous Vehicles},
	author = {Chen, Hua., Hovareshti, Pedram., Baras, John S.},
	year = {2010},
	month = {10/2010},
	abstract = {Situational awareness requires maintaining a reasonable level of communication connectivity in networks of autonomous vehicles. It is difficult to overcome deep fading from time-varying wireless channels in a dynamic and resource constrained environment. Moreover, other system constraints such as the energy consumption and total operation time make the design of communication protocols for such systems more challenging. In this paper, we consider the problem of efficient communications between a group of autonomous vehicles with energy consumption and total operation time constraints in an adversarial environment. We show that the policy of continuously attempting to communicate reliably over the course of the mission may lead to considerable system degradation. We propose an adaptive algorithm to make communication attempts opportunistically, based on the qualities of the wireless channels as the vehicles move throughout the terrain. We compare the proposed algorithm with a non-opportunistic algorithm in which the vehicles blindly attempt to communicate regularly throughout the course of the mission. We show that the proposed algorithm significantly improves the system performance, both in terms of operation time when the agents transmit only situational information and data throughput when additional data transmission is necessary.},
	address = {San Jose, CA},
	booktitle = {2010 Military Communications Conference (MILCOM 2010)},
	pages = {pp. 1306-1311}
}
@conference {
	title = {VSAT return Channel Optimizations for Broadband Internet Support in 2-Way Satellite Networks},
	author = {Roy-Chowdhury, Ayan., Baras, John S., Robinson, Mitch.},
	year = {2010},
	month = {10/2010},
	abstract = {In this paper we describe our work on a Very Small Aperture Terminal (VSAT) satellite Internet gateway with capacity and latency optimizations in the return channel so as to allow significantly higher number of users, and a better user experience. The gateway is based on the Cerona SkySPAN technology which uses the Digital Video Broadcast via Satellite 2nd standard (DVB-S2) in the forward channel, and single-channel slotted Aloha protocol in the return channel. In this paper we describe the Spread Aloha Multiple Access (SAMA) protocol which we implement in the return channel. The SAMA protocol promises to deliver high speeds at a third of the latency compared to competing technologies like DVB-RCS (multi-frequency TDMA), while allowing the same number of users in 3MHz bandwidth as is possible in TDMA using 36MHz. We also describe the implementation of the Fast Multi-channel Slotted Aloha (FMCSA) protocol that will co-exist with SAMA in the return channel. FMCSA combines slotted Aloha random access with packet level forward error correction (FEC) for new messages and scheduled retransmissions for partially received messages. Due to the parity packets sent in FMCSA, more load is offered to the channel than in SAMA to achieve the same throughput. The delay performance of FMCSA is also much more robust to load fluctuations than SAMA. The combination of SAMA and FMCSA improves the robustness and throughput of the SkySPAN return channel and reduces the channel latency, while supporting significantly higher number of users, in comparison to the competition.},
	address = {Milan, Italy},
	booktitle = {16th Ka and Broadband Communications Conference},
	pages = {pp. 479-486}
}
@conference {
	title = {The Role of Cholesterol in Alzheimer{\textquoteright}s disease Pathogenesis: Preliminary Report},
	author = {Kyrtsos, C Rose., Baras, John S.},
	year = {2010},
	month = {10/2010},
	abstract = {Alzheimer{\textquoteright}s disease (AD) is a devastating neurodegenerative disorder affecting 1 in 8 individual over the age of 65. A growing body of evidence is suggesting that cholesterol levels in both the brain and the plasma may play significant roles in AD pathogenesis; however, the exact nature of this role is currently not well understood. Building on previous experiments, we have approached this problem using two, complementary methods- a systems biology model for brain metabolic networks that is based on empirical data gathered from in vivo experiments. The main goal of this study was to determine the effect that decreased brain cholesterol had on the level of beta amyloid (the key protein implicated in AD pathogenesis) and the extent of neurodegeneration observed. To achieve this, APPSwe/PS1 double transgenic mice were treated twice daily with simvastatin (a cholesterol-lowering drug) for a period of 2 or 10 weeks. The effects of the decreased brain cholesterol levels on APP and beta amyloid processing, as well as apoE and LRP-1 expression levels was studied using Western blotting and immunohistochemistry techniques, respectively. The extent of neurodegeneration was determined via immunohistochemical staining of hippocampal slices for synaptic density and neuron viability. The weights between key nodes in the systems biology model were updated to account for the observed experimental results.},
	address = {Austin, Texas},
	booktitle = {Biomedical Engineering Society (BMES 2010)}
}
