Electrical Engineering and Computer Science Scholarly Works: Recent submissions

Now showing items 121-140 of 309

    • Constructing non-stationary Dynamic Bayesian Networks with a flexible lag choosing mechanism 

      Jia, Yi; Huan, Luke (BioMed Central, 2010-10-07)
      Background Dynamic Bayesian Networks (DBNs) are widely used in regulatory network structure inference with gene expression data. Current methods assumed that the underlying stochastic processes that generate the gene ...

    • Application of kernel functions for accurate similarity search in large chemical databases 

      Wang, Xiaohong; Huan, Luke; Smalter, Aaron Matthew; Lushington, Gerald H. (BioMed Central, 2010)
      Background Similaritysearch in chemical structure databases is an important problem with many applications in chemical genomics, drug design, and efficient chemical probe screening among others. It is widely believed ...

    • Measurements and Analysis of Secondary User Device Effects on Digital Television Receivers 

      Newman, Timothy R.; DePardo, Daniel; Wyglinski, Alexander M.; Evans, Joseph B.; Rajbanshi, Rakesh; Petty, Victor R.; Datla, Dinesh; Weidling, Frederick; Kolodzy, Paul J.; Marcus, Michael J.; Minden, Gary J.; Roberts, James A. (SpringerOpen, 2009-11-30)
      This article presents results from a study of the potential effects of secondary users operating in unoccupied television spectrum. Television spectrum is known within the wireless communications community as being ...

    • The radiation characteristics of an arbitrary antenna positioned on a polar ice sheet 

      West, James C.; Demarest, Kenneth R. (American Geological Institute, 2005)
      The radiation pattern of an arbitrarily shaped antenna system placed directly on the surface of a polar ice sheet (a configuration often used for ice-probing radars) may be determined at any depth within the ice sheet using ...

    • Ice flow of Humboldt, Petermann and Ryder Gletscher, northern Greenland 

      Joughin, Ian R.; Fahnestock, Mark; Kwok, Ron; Gogineni, Sivaprasad; Allen, Christopher Thomas (International Glaciological Society, 1999-06)
      Radar interferometry, ice-penetrating radar profiles and an elevation model are used to determinc the veloeity fields, rates of ice discharge, approximate states of balance and catchment area for three large outlet glaciers ...

    • Ψ-RA: a parallel sparse index for genomic read alignment 

      Kulekci, M. Oguzhan; Hon, Wing-Kai; Shah, Rahul; Vitter, Jeffrey Scott; Xu, Bojian (BioMed Central, 2011-07-27)
      Background Genomic read alignment involves mapping (exactly or approximately) short reads from a particular individual onto a pre-sequenced reference genome of the same species. Because all individuals of the same species ...

    • Tunable excitation source for coherent Raman spectroscopy based on a single fiber laser 

      Adany, Peter (American Institute of Physics, 2011)
      We demonstrate a wavelength tunable optical excitation source for coherent Raman scattering (CRS) spectroscopy based on a single femtosecondfiber laser. Electrically controlled wavelength tuning of Stokes optical pulses ...

    • Emission and absorption cross-sections of an Er:GaN waveguide prepared with metal organic chemical vapor deposition 

      Wang, Q.; Dahal, R.; Feng, I. W.; Lin, J. Y.; Jiang, Hongxing; Hui, Rongqing (American Institute of Physics, 2011)
      We repost the characterization of emission and absorption cross-sections in an erbium-doped GaN waveguide prepared by metal organic chemical vapor deposition. The emission cross-section was obtained with the Füchtbauer–Ladenburg ...

    • Stressed waveguides with tubular depressed-cladding inscribed in phosphate glasses by femtosecond hollow laser beams 

      Long, Xuewen; Bai, Jing; Zhao, Wei; Stoian, Razvan; Hui, Rongqing; Cheng, Guanghua (Optical Society of America, 2012)
      We report on the single-step fabrication of stressed optical waveguides with tubular depressed-refractive-index cladding in phosphate glasses by the use of focused femtosecond hollow laser beams. Tubelike low index regions ...

    • Frequency-modulated continuous-wave lidar using I / Q modulator for simplified heterodyne detection 

      Gao, Shuang; Hui, Rongqing (Optical Society of America, 2012-05-30)
      A frequency-modulated continuous-wave (FMCW) lidar is demonstrated with heterodyne detection. The lidar transmitter utilizes an electro-optic 𝐼/𝑄 modulator for the first time to generate carrier-suppressed and frequency-shifted ...

    • Surface-passivated plasmonic nano-pyramids for bulk heterojunction solar cell photocurrent enhancement 

      Kirkeminde, Alec; Retsch, Markus; Wang, Qian; Xu, Guowei; Hui, Rongqing; Wu, Judy Z.; Ren, Shenqiang (Royal Society of Chemistry, 2012)
      We report that self-assembled gold (Au) nanopyramid arrays can greatly enhance the photocurrent of narrow bandgap organic solar cells using their plasmonic near-field effect. The plasmonic enhanced power conversion efficiency ...

    • Bedmap2: improved ice bed, surface and thickness datasets for Antarctica 

      Fretwell, P.; Pritchard, H. D.; Vaughan, D. G.; Bamber, Jonathan L.; Barrand, N. E.; Bell, R.; Bianchi, C.; Bingham, R. G.; Blankenship, Donald D.; Casassa, G.; Catania, Ginny A.; Callens, D.; Conway, H.; Cook, A. J.; Corr, Hugh F. J.; Damaske, D.; Damm, V.; Ferraccioli, F.; Forsberg, René; Fujita, S.; Gim, Y.; Gogineni, Sivaprasad; Griggs, J. A.; Hindmarsh, R.; Holmlund, P.; Holt, J. W.; Jacobel, R. W.; Jenkins, A.; Jokat, W.; Jordan, T.; King, E. C.; Kohler, J.; Krabill, William B.; Riger-Kusk, M.; Langley, K. A.; Leitchenkov, G.; Leuschen, Carl J.; Lyendyk, B. P.; Matsuoka, K.; Mouginot, J.; Nitsche, F. O.; Nogi, Y.; Nost, O. A.; Popov, S. V.; Rignot, E.; Rippin, D. M.; Rivera, A.; Roberts, James A.; Ross, N.; Siegert, M. J.; Smith, A. M.; Steinhage, Daniel; Studinger, M.; Sun, B.; Tinto, B. K.; Welch, B. C.; Wilson, D.; Young, Duncan A.; Xiangbin, C.; Zirizzotti, A. (European Geosciences Union, 2013-02-28)
      We present Bedmap2, a new suite of gridded products describing surface elevation, ice-thickness and the seafloor and subglacial bed elevation of the Antarctic south of 60° S. We derived these products using data from a ...

    • A new bed elevation dataset for Greenland 

      Bamber, Jonathan L.; Griggs, J. A.; Hurkmans, R. T. W. L.; Dowdeswell, J. A.; Gogineni, Sivaprasad; Howat, I.; Mouginot, J.; Jaden, John D.; Palmer, S.; Rignot, E.; Steinhage, Daniel (European Geosciences Union, 2013-03-22)
      We present a new bed elevation dataset for Greenland derived from a combination of multiple airborne ice thickness surveys undertaken between the 1970s and 2012. Around 420 000 line kilometres of airborne data were used, ...

    • Radar mapping of Isunnguata Sermia, Greenland 

      Jezek, Kenneth C.; Wu, X.; Paden, John D.; Leuschen, Carl J. (International Glaciological Society, 2013-12-01)
      Ice thickness estimates using advanced nadir sounding and tomographic radar processing techniques are compared and combined in a study of Isunnguata Sermia glacier, Greenland. Using an ensemble of Operation IceBridge flight ...

    • An ultra-wideband, microwave radar for measuring snow thickness on sea ice and mapping near-surface internal layers in polar firn 

      Panzer, Ben; Gomez-Garcia, Daniel; Leuschen, Carl J.; Paden, John D.; Rodriguez-Morales, Fernando; Patel, Aqsa; Markus, Thorsten; Holt, Benjamin; Gogineni, Sivaprasad (International Glaciological Society, 2013-04-01)
      Sea ice is generally covered with snow, which can vary in thickness from a few centimeters to >1 m. Snow cover acts as a thermal insulator modulating the heat exchange between the ocean and the atmosphere, and it impacts ...

    • Energy-Efficient Wireless Communications with Future Networks and Diverse Devices 

      Chen, Runhua; Liu, Lingjia; Sayana, Krishna; Li, Hongxiang (Hindawi Publishing Corporation, 2013)

    • Standoff alpha radiation detection via excited state absorption of air 

      Yao, Jimmy; Brenizer, Jack; Hui, Rongqing; Yin, Stuart Shizhuo (American Institute of Physics, 2013-06-24)
      A standoff alpha radiation detection technique based on the physical mechanism of excited state absorption of air molecules was explored and is presented in this paper. Instead of directly detecting the radiation via ...

    • Constraining the recent mass balance of Pine Island and Thwaites glaciers, West Antarctica, with airborne observations of snow accumulation 

      Medley, B.; Joughin, Ian R.; Smith, B. E.; Das, S. B.; Steig, E. J.; Conway, H.; Gogineni, Sivaprasad; Lewis, Cameron Scott; Criscitiello, A. S.; McConnell, Joesph R.; van den Broeke, Michiel R.; Lenaerts, J. T. M.; Bromwich, D. H.; Nicolas, J. P.; Leuschen, Carl J. (European Geosciences Union, 2014-07-31)
      In Antarctica, uncertainties in mass input and output translate directly into uncertainty in glacier mass balance and thus in sea level impact. While remotely sensed observations of ice velocity and thickness over the major ...

    • Electrodynamical Light Trapping Using Whispering-Gallery Resonances in Hyperbolic Cavities 

      Wu, Chihhui; Salandrino, Alessandro; Ni, Xingjie; Zhang, Xiang (American Physical Society, 2014-04-22)
      We theoretically study spherical cavities composed of hyperbolic metamaterials with indefinite permittivity tensors. Such cavities are capable of electrodynamically confining fields with deep subwavelength cavity sizes. ...

    • Fiber-optic acoustic pressure sensor based on large-area nanolayer silver diaghragm 

      Xu, Feng; Shi, Jinhui; Gong, Kui; Li, Hefei; Hui, Rongqing; Yu, Benli (Optical Society of America, 2014-05-15)
      A fiber-optic acoustic pressure sensor based on a large-area nanolayer silver diaphragm is demonstrated with a high dynamic pressure sensitivity of 160  nm/Pa at 4 kHz frequency. The sensor exhibits a noise limited detectable ...