@article{pietrafesa_zhang_bao_gayes_hallstrom_2019, title={Coastal Flooding and Inundation and Inland Flooding due to Downstream Blocking}, volume={7}, ISSN={["2077-1312"]}, DOI={10.3390/jmse7100336}, abstractNote={Extreme atmospheric wind and precipitation events have created extensive multiscale coastal, inland, and upland flooding in United States (U.S.) coastal states over recent decades, some of which takes days to hours to develop, while others can take only several tens of minutes and inundate a large area within a short period of time, thus being laterally explosive. However, their existence has not yet been fully recognized, and the fluid dynamics and the wide spectrum of spatial and temporal scales of these types of events are not yet well understood nor have they been mathematically modeled. If present-day outlooks of more frequent and intense precipitation events in the future are accurate, these coastal, inland and upland flood events, such as those due to Hurricanes Joaquin (2015), Matthew (2016), Harvey (2017) and Irma (2017), will continue to increase in the future. However, the question arises as to whether there has been a well-documented example of this kind of coastal, inland and upland flooding in the past? In addition, if so, are any lessons learned for the future? The short answer is “no”. Fortunately, there are data from a pair of events, several decades ago—Hurricanes Dennis and Floyd in 1999—that we can turn to for guidance in how the nonlinear, multiscale fluid physics of these types of compound hazard events manifested in the past and what they portend for the future. It is of note that fifty-six lives were lost in coastal North Carolina alone from this pair of storms. In this study, the 1999 rapid coastal and inland flooding event attributed to those two consecutive hurricanes is documented and the series of physical processes and their mechanisms are analyzed. A diagnostic assessment using data and numerical models reveals the physical mechanisms of downstream blocking that occurred.}, number={10}, journal={JOURNAL OF MARINE SCIENCE AND ENGINEERING}, author={Pietrafesa, Leonard J. and Zhang, Hongyuan and Bao, Shaowu and Gayes, Paul T. and Hallstrom, Jason O.}, year={2019}, month={Oct} }
 @article{zhang_dai_2006, title={Fast MIMO transmit antenna selection algorithms: A geometric approach}, volume={10}, ISSN={["1558-2558"]}, DOI={10.1109/LCOMM.2006.060604}, abstractNote={Motivated by matrix determinant properties, this letter develops a fast transmit antenna selection algorithm for MIMO systems: the G-circles method. This novel scheme is shown to achieve many advantages over other existing algorithms}, number={11}, journal={IEEE COMMUNICATIONS LETTERS}, author={Zhang, Hongyuan and Dai, Huaiyu}, year={2006}, month={Nov}, pages={754–756} }
 @article{zhang_dai_zhou_hughes_2006, title={On the diversity order of spatial multiplexing systems with transmit antenna selection: A geometrical approach}, volume={52}, ISSN={["1557-9654"]}, DOI={10.1109/TIT.2006.885531}, abstractNote={In recent years, the remarkable ability of multiple-input-multiple-output (MIMO) wireless communication systems to provide spatial diversity or multiplexing gains has been clearly demonstrated. For MIMO diversity schemes, it is well known that antenna selection methods that optimize the postprocessing signal-to-noise ratio (SNR) can preserve the diversity order of the original full-size MIMO system. On the other hand, the diversity order achieved by antenna selection in spatial multiplexing systems, especially those exploiting practical coding and decoding schemes, has not thus far been rigorously analyzed. In this paper, a geometrical framework is proposed to theoretically analyze the diversity order achieved by transmit antenna selection for separately encoded spatial multiplexing systems with linear and decision-feedback receivers. When two antennas are selected from the transmitter, the exact achievable diversity order is rigorously derived, which previously only appears as conjectures based on numerical results in the literature. If more than two antennas are selected, we give lower and upper bounds on the achievable diversity order. Furthermore, the same geometrical approach is used to evaluate the diversity-multiplexing tradeoff in spatial multiplexing systems with transmit antenna selection}, number={12}, journal={IEEE TRANSACTIONS ON INFORMATION THEORY}, author={Zhang, Hongyuan and Dai, Huaiyu and Zhou, Quan and Hughes, Brian L.}, year={2006}, month={Dec}, pages={5297–5311} }
 @inproceedings{zhang_dai_hughes_2006, title={On the diversity-multiplexing Tradeoff for ordered SIC receivers over MIMO channels}, DOI={10.1109/icc.2006.254939}, abstractNote={The diversity-multiplexing tradeoff for MIMO point-to-point channels and multiple access channels are first proposed and studied in [4][5]. While the optimal tradeoff curves for MIMO channels have been explicitly explored, those corresponding to some practical MIMO schemes are still open. One such example, as mentioned in [4][5], is the diversity-multiplexing tradeoff problem for ordered successive interference cancellation (SIC) receivers, which is the focus of this paper. In literature, the impact of the optimal ordering on the diversity order for V-BLAST SIC receivers is analyzed for 2-layer scenarios [2][3][6], but only conjectured for larger number of layers through numerical results [2][7]. In this paper, based on a novel geometrical analysis, we prove that under general settings, any ordering rule for a V-BLAST SIC receiver will not improve its performance regarding diversity-multiplexing tradeoff. Furthermore, extending the study to multiple access channels, we show that the two extreme points of the tradeoff curve remain unchanged regardless of ordering, which motivates us to predict that the whole tradeoff curve is the same as that of fixed-order detectors.}, booktitle={2006 ieee international conference on communications, vols 1-12}, author={Zhang, H. Y. and Dai, H. Y. and Hughes, B. L.}, year={2006}, pages={1368–1373} }
 @article{cai_zhang_hua_zhang_2002, title={Direct formation of self-assembled nanoporous aluminium oxide on SiO2 and Si substrates}, volume={13}, ISSN={["1361-6528"]}, DOI={10.1088/0957-4484/13/5/317}, abstractNote={An unconventional self-assembly process was integrated with traditional silicon microfabrication technologies to directly form hexagonally ordered nanoporous patterns on both SiO2 and Si surfaces. Starting with an aluminium thin film deposited on a SiO2 or Si substrate, an Al anodization process was employed to generate highly uniform nanoporous anodic aluminium oxide thin films with average pore diameters of 30–70 nm directly on SiO2 and Si surfaces. The long-range order of the anodic aluminium oxide nanoporous structures was improved by thermally annealing the starting Al films to promote the grain size growth and by utilizing a multiple anodization process to enhance their uniformity. The formation of the hexagonally ordered nanoporous array may be attributed to the interplay between the topological requirement for space filling of pores and the kinetics of domain growth with time under a constant anodization voltage. These results demonstrate the feasibility of integrating self-assembled anodic aluminium oxide nanostructures with Si microfabrication technologies in the pursuit of future-generation Si nanoelectronic devices.}, number={5}, journal={NANOTECHNOLOGY}, author={Cai, AL and Zhang, HY and Hua, H and Zhang, ZB}, year={2002}, month={Oct}, pages={627–630} }