Now showing items 1-12 of 12

    • Decentralized control and periodic feedback 

      Khargonekar P. P.; Özgüler, A. B. (IEEE, 1994)
      The decentralized stabilization problem for linear, discretetime, periodically time-varying plants using periodic controllers is considered. The main tool used is the technique of lifting a periodic system to a time-invariant ...
    • Efficient use of closed-form Green's functions for three-dimensional problems involving multilayered media 

      Aksun, M. I.; Mittra, R. (Institute of Electrical and Electronics Engineers, 1994)
      With the use of casting the spatial domain Green's functions into closed forms approach, it was demonstrated that the computational efficiency of the method of moments (MoM) for the solution of the mixed potential integral ...
    • Fast and accurate solutions of scattering problems involving dielectric objects with moderate and low contrasts 

      Ergül, Ö.; Gürel, L. (2007)
      We consider the solution of electromagnetic scattering problems involving relatively large dielectric objects with moderate and low contrasts. Three-dimensional objects are discretized with Rao-Wilton-Glisson functions and ...
    • GPS/TEC estimation with IONOLAB method 

      Nayir H.; Arikan F.; Arikan, O.; Erol, C.B. (2007)
      Total Electron Content (TEC) is a key variable to measure the ionospheric characteristics and disturbances. The Global Positioning System (GPS) can be used for TEC estimation making use of the recorded signals at the GPS ...
    • Improving AWE accuracy using multipoint Pade approximation 

      Celik, M.; Ocali, O.; Tan, M. A.; Atalar, Abdullah (IEEE, 1994)
      A new method is proposed for dominant pole-zero analysis of large linear circuits containing both lumped and distributed elements. This method is based on a multipoint Pade approximation. It finds a reduced order s-domain ...
    • Large deviations of probability rank 

      Arikan, E. (2000)
      Consider a pair of random variables (X,Y) with distribution P. The probability rank function is defined so that G(x|y) = 1 for the most probable outcome x conditional on Y = y, G(x|y) = 2 for the second most probable ...
    • Levy walk evolution for global optimization 

      Urfaliog̃lu O.; Çetin, A.E.; Kuruog̃lu, E.E. (2008)
      A novel evolutionary global optimization approach based on adaptive covariance estimation is proposed. The proposed method samples from a multivariate Levy Skew Alpha-Stable distribution with the estimated covariance matrix ...
    • Memory-efficient multilevel physical optics algorithm for fast computation of scattering from three-dimensional complex targets 

      Manyas, A.; Gürel, L. (2007)
      Multilevel physical optics (MLPO) algorithm provides a speed-up for computing the physical-optics integral over complex bodies for a range of aspect angles and frequencies. On the other hand, when computation of the RCS ...
    • Model based comparison of basis functions and reconstruction algorithms in computerized ionospheric tomography 

      Yavuz, E.; Arikan F.; Arikan, O.; Berin Erol, C. (2005)
      Computerized Ionospheric Tomography (CIT) is a method to investigate ionospheric electron density in two or three dimensions. CIT provides a flexible method for studying ionosphere. In CIT, GPS satellites and Earth based ...
    • New identities for 7-cores with prescribed BG-rank 

      Berkovich, A.; Yesilyurt, H. (Elsevier BV * North-Holland, 2008)
      Let π be a partition. BG-rank(π) is defined as an alternating sum of parities of parts of π [A. Berkovich, F.G. Garvan, On the Andrews-Stanley refinement of Ramanujan's partition congruence modulo 5 and generalizations, ...
    • Self Fourier functions and fractional Fourier transforms 

      Mendlovic, D.; Ozaktas, H. M.; Lohmann, A. W. (Elsevier, 1994)
      Self Fourier functions and fractional Fourier transforms are two concepts that have been discussed recently. Investigated is the combination of these two concepts: self fractional Fourier functions and the fractional Fourier ...
    • Synthetic TEC mapping with ordinary and universal kriging 

      Sayin I.; Arikan F.; Arikan, O. (2007)
      Spatiotemporal variations in the ionosphere affects the HF and satellite communications and navigation systems. Total Electron Content (TEC) is an important parameter since it can be used to analyze the spatial and temporal ...