@article{xu_wang_2013, title={Scheduling Partition for Order Optimal Capacity in Large-Scale Wireless Networks}, volume={12}, ISSN={["1536-1233"]}, DOI={10.1109/tmc.2012.113}, abstractNote={The capacity scaling property specifies the change of network throughput when network size increases. It serves as an essential performance metric in large-scale wireless networks. Existing results have been obtained based on the assumption of using a globally planned link transmission schedule in the network, which is however not feasible in large wireless networks due to the scheduling complexity. The gap between the well-known capacity results and the infeasible assumption on link scheduling potentially undermines our understanding of the achievable network capacity. In this paper, we propose the scheduling partition methodology that decomposes a large network into small autonomous scheduling zones and implements a localized scheduling algorithm independently in each partition. We prove the sufficient and the necessary conditions for the scheduling partition approach to achieve the same order of capacity as the widely assumed global scheduling strategy. In comparison to the network dimension $(\sqrt{n})$, scheduling partition size $(\Theta (r(n)))$ is sufficient to obtain the optimal capacity scaling, where $(r(n))$ is the node transmission radius and much smaller than $(\sqrt{n})$. We finally propose a distributed partition protocol and a localized scheduling algorithm as our scheduling solution for maximum capacity in large wireless networks.}, number={4}, journal={IEEE TRANSACTIONS ON MOBILE COMPUTING}, author={Xu, Yi and Wang, Wenye}, year={2013}, month={Apr}, pages={666–679} }
 @article{xu_wang_2013, title={Wireless Mesh Network in Smart Grid: Modeling and Analysis for Time Critical Communications}, volume={12}, ISSN={["1536-1276"]}, DOI={10.1109/twc.2013.061713.121545}, abstractNote={Communication networks are an indispensable component in the smart grid power systems by providing the essential information exchange functions among the electrical devices that are located distributively in the grid. In particular, wireless networks will be deployed widely in the smart grid for data collection and remote control purposes. In this paper, we model the smart grid wireless networks and present the communication delay analysis in typical wireless network deployment scenarios in the grid. As the time critical communications are coupled with the power system protections in the smart grid, it is important to understand the delay performance of the smart grid wireless networks. Our results provide the delay bounds that can help design satisfactory wireless networks to meet the demanding communication requirements in the smart grid.}, number={7}, journal={IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS}, author={Xu, Yi and Wang, Wenye}, year={2013}, month={Jul}, pages={3360–3371} }
 @article{wang_xu_khanna_2011, title={A survey on the communication architectures in smart grid}, volume={55}, ISSN={["1872-7069"]}, DOI={10.1016/j.comnet.2011.07.010}, abstractNote={The next-generation electric power systems (smart grid) are studied intensively as a promising solution for energy crisis. One important feature of the smart grid is the integration of high-speed, reliable and secure data communication networks to manage the complex power systems effectively and intelligently. We provide in this paper a comprehensive survey on the communication architectures in the power systems, including the communication network compositions, technologies, functions, requirements, and research challenges. As these communication networks are responsible for delivering power system related messages, we discuss specifically the network implementation considerations and challenges in the power system settings. This survey attempts to summarize the current state of research efforts in the communication networks of smart grid, which may help us identify the research problems in the continued studies.}, number={15}, journal={COMPUTER NETWORKS}, author={Wang, Wenye and Xu, Yi and Khanna, Mohit}, year={2011}, month={Oct}, pages={3604–3629} }
 @inproceedings{xu_wang_2011, title={Information delivery in large wireless networks with minimum energy expense}, DOI={10.1109/infcom.2011.5934950}, abstractNote={Energy efficient communication is a critical research problem in large-scale multihop wireless networks because of the limited energy supplies from batteries. We investigate in this paper the minimum energy required to fulfill various information delivery goals that correspond to the major communication paradigms in large wireless networks. We characterize the minimum energy requirement in two steps. We first derive the lower bounds on the energy consumption for all the possible solutions that deliver the information as required. We then design routing schemes that accomplish the information delivery tasks by using an amount of energy comparable to the lower bounds. Our work provides the fundamental understandings of energy needs and the efficient solutions for energy usages in major communication scenarios, which contribute to the rational dimensioning and wise utilization of the energy resources in large wireless networks.}, booktitle={2011 proceedings ieee infocom}, author={Xu, Y. and Wang, Wenye}, year={2011}, pages={1584–1592} }
 @article{xu_wang_2011, title={The Limit of Information Propagation Speed in Large-Scale Multihop Wireless Networks}, volume={19}, ISSN={["1558-2566"]}, DOI={10.1109/tnet.2010.2057444}, abstractNote={This paper investigates the speed limit of information propagation in large-scale multihop wireless networks, which provides fundamental understanding of the fastest information transportation and delivery that a wireless network is able to accommodate. We show that there exists a unified speed upper bound for broadcast and unicast communications in large-scale wireless networks. When network connectivity is considered, this speed bound is a function of node density. If the network noise is constant, the bound is a constant when node density exceeds a threshold; if the network noise is an increasing function of node density, the bound decreases to zero when node density approaches infinity. As achieving the speed bound places strict requirements on node locations, we also quantify the gap between the actual achieved speed and the desired bound in random networks in which the relay nodes are not located as desired. We find that the gap converges to zero exponentially as node density increases to infinity.}, number={1}, journal={IEEE-ACM TRANSACTIONS ON NETWORKING}, author={Xu, Yi and Wang, Wenye}, year={2011}, month={Feb}, pages={209–222} }
 @article{xu_wang_2009, title={Topology Stability Analysis and Its Application in Hierarchical Mobile Ad Hoc Networks}, volume={58}, ISSN={["1939-9359"]}, DOI={10.1109/TVT.2008.928006}, abstractNote={The hierarchical architecture has been proven effective for solving the scalability problems in large-scale ad hoc networks. The stability of the hierarchical architecture is a key factor in determining the network performance. Although many solutions have been proposed to construct stable clusters, the maximum stability achievable in mobile environments is still unknown. In this paper, we define three metrics for measuring network stability: (1) the cluster lifetime;(2) the intercluster link lifetime; and (3) the end-to-end path lifetime. We model and analyze the maximum of these lifetimes under the constraint of random node mobility. Analytical results provide the fundamental understanding of the bounds on network stability. Inspired by this understanding, we propose a clustering algorithm and a hierarchical routing protocol that work together to achieve the maximum network stability. The analytical results are verified by simulations.}, number={3}, journal={IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY}, author={Xu, Yi and Wang, Wenye}, year={2009}, month={Mar}, pages={1546–1560} }
 @article{xu_wang_2008, title={Finding the fastest path in wireless networks}, ISBN={["978-1-4244-2074-2"]}, ISSN={["1550-3607"]}, DOI={10.1109/icc.2008.600}, abstractNote={The timeliness of packet delivery is an important performance measure in wireless networks, especially when urgent messages need to be transported through a network. This paper investigates the fastest packet transportation in light-loaded wireless networks. We show that the end-to-end packet delay depends largely on the locations of the relay nodes that forward the packet and there exists a shortest-delay path theoretically. We also propose a routing algorithm to locate a fast relay path in actual networks to achieve the near-shortest packet delay.}, journal={2008 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, PROCEEDINGS, VOLS 1-13}, author={Xu, Yi and Wang, Wenye}, year={2008}, pages={3188–3192} }
 @article{korobkna_wehring_hawari_young_huffman_golub_xu_palmquist_2007, title={An ultracold neutron source at the NC state university PULSTAR reactor}, volume={579}, ISSN={0168-9002}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-34547682155&partnerID=MN8TOARS}, DOI={10.1016/j.nima.2007.04.116}, abstractNote={Research and development is being completed for an ultracold neutron (UCN) source to be installed at the PULSTAR reactor on the campus of North Carolina State University (NCSU). The objective is to establish a university-based UCN facility with sufficient UCN intensity to allow world-class fundamental and applied research with UCN. To maximize the UCN yield, a solid ortho-D2 converter will be implemented coupled to two moderators, D2O at room temperature, to thermalize reactor neutrons, and solid CH4, to moderate the thermal neutrons to cold-neutron energies. The source assembly will be located in a tank of D2O in the space previously occupied by the thermal column of the PULSTAR reactor. Neutrons leaving a bare face of the reactor core enter the D2O tank through a 45×45 cm cross-sectional area void between the reactor core and the D2O tank. Liquid He will cool the disk-shaped UCN converter to below 5 K. Independently, He gas will cool the cup-shaped CH4 cold-neutron moderator to an optimum temperature between 20 and 40 K. The UCN will be transported from the converter to experiments by a guide with an inside diameter of 16 cm. Research areas being considered for the PULSTAR UCN source include time-reversal violation in neutron beta decay, neutron lifetime determination, support measurements for a neutron electric-dipole-moment search, and nanoscience applications.}, number={1}, journal={NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT}, author={Korobkna, E. and Wehring, B. W. and Hawari, A. I. and Young, A. R. and Huffman, P. R. and Golub, R. and Xu, Y. and Palmquist, G.}, year={2007}, month={Aug}, pages={530–533} }
 @inproceedings{xu_wang, title={The speed of information propagation in large wireless networks}, booktitle={27th IEEE Conference on Computer Communications (Infocom), vols 1-5}, author={Xu, Y. and Wang, W. Y.}, pages={403–411} }