Creator | Title | Description | Subject | Date | ||
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1 | Tasdizen, Tolga; Whitaker, Ross T. | Anisotropic diffusion of surface normals for feature preserving surface reconstruction | For 3D surface reconstruction problems with noisy and incomplete range data measure d from complex scenes with arbitrary topologies, a low-level representation, such as level set surfaces, is used. Such surface reconstruction is typically accomplished by minimizing a weighted sum of data-model discr... | 2003 | ||

2 | Mathews, V. John; Nilsson, Michael | Adaptive gain processing to improve feedback cancellation in digital hearing aids | Adaptive filters are commonly used to cancel acoustic feedback in hearing aids. The sound quality of hearing aids deteriorates as the hearing aid gain is increased. This paper presents a method to alter the gain function in digital hearing aids to provide additional amplification and better output ... | 2008 | ||

3 | Stevens, Kenneth; Davis, Alan L. | Automatic synthesis of fast compact self-timed control circuits | We present a tool called MEAT which has been designed to automatically synthesize transistor level. CMOS, self-timed control circuits. MEAT has been used to specify and synthesize self-timed circuits for a fully self-timed 300,000 transistor communication coprocessor. The design is specified using f... | 1993 | ||

4 | Harrison, Reid R. | Power, clock, and data recovery in a wireless neural recording device | For many medical applications, neural recording systems should be fully implantable. Transcutaneous wires must be compleley eliminated, and this necessitates the wireless transfer of power, clock and configuration data to the device. We have developed, fabricated, and tested cirucits that recover po... | 2006 | ||

5 | Myers, Chris J.; Stevens, Kenneth | Average-case optimized technology mapping of one-hot domino circuits* | This paper presents a technology mapping technique for optimizing the average-case delay of asynchronous combinational circuits implemented using domino logic and one-hot encoded outputs. The technique minimizes the critical path for common input patterns at the possible expense of making less commo... | 1998 | ||

6 | Mathews, V. John | Vector quantization of images using the L∞ distortion measure | This paper considers vector quantization of signals using the Loo distortion measure. The key contribution is a result that allows one to characterize the centroid of a set of vectors for the Loo distortion measure. A method similar to the LBG algorithm for designing codebooks has been develope... | 1995 | ||

7 | Harrison, Reid R. | Versatile integrated circuit for the acquisition of biopotentials | Electrically active cells in the body produce a wide variety of voltage signals that are useful for medical diagnosis and scientific investigation. These biopotentials span a wide range of amplitudes and frequencies. We have developed a versatile front-end integrated circuit that can be used to amp... | Biopotential; Neural recording; Electrodes; Amplifier | 2007-09 | |

8 | Mathews, V. John | Subband particle filtering for speech enhancement | ABSTRACT Particle filters have recently been applied to speech enhancement when the input speech signal is modeled as a time-varying autoregressive process with stochastically evolving parameters. This type of modeling results in a nonlinear and conditionally Gaussian statespace system that is not ... | 2006 | ||

9 | Tasdizen, Tolga; Terry, Christi M.; Cheung, Alfred K.; Kirby, Robert Michael II | Using the stochastic collocation method for the uncertainty quantification of drug concentration due to depot shape variability | Numerical simulations entail modeling assumptions that impact outcomes. Therefore, characterizing, in a probabilistic sense, the relationship between the variability of model selection and the variability of outcomes is important. Under certain assumptions, the stochastic collocation method offers ... | 2009 | ||

10 | Mathews, V. John; Clark, Edward B. | A mathematical basis for the application of the modified geometric method to maximum frequency estimation | Abstract-The application of ultrasound in assessing the fetal cardiovascular system often requires the accurate estimation of maximum blood flow velocity waveforms using Doppler measurements. The modified geometric method estimates the maximum Doppler frequency as the frequency at which the vertica... | 2004 | ||

11 | Furse, Cynthia M.; Farhang, Behrouz | Integration of signals/systems and electromagnetics courses through the design of a communication system for a cardiac pacemaker | As students go through a traditional ECE program, they lean a great deal about individual components and tools: transistors, op amps, diodes, resistors, transmission lines, and Fourier transforms. In a traditional lab they build and test these individual units. But when the lab is done, whether or n... | 2005-04 | ||

12 | Mathews, V. John | Pilot embedding for channel estimation and tracking in OFDM systems | Abstract-We consider the problem of channel estimation and tracking in OFDM systems and explore the idea of adding pilot symbols to the data symbols as a means to conserve bandwidth. The term pilot embedding (PE) is used to refer to this scheme. Compared to the pilot insertion (PI) scheme, i.e., the... | 2004 | ||

13 | Stevens, Kenneth | Bandwidth optimization in asynchronous NoCs by customizing link wire length | The bandwidth requirement for each link on a network-on-chip (NoC) may differ based on topology and traffic properties of the IP cores. Available bandwidth on an asynchronous NoC link will also vary depending on the wire length between sender and receiver. We explore the benefit to NoC performance ... | 2010 | ||

14 | Stringfellow, Gerald B. | Step structure and ordering in Te-doped GaInP | The step structure and CuPt ordering in GaInP layers grown by organometallic vapor phase epitaxy on singular GaAs substrates have been investigated as a function of Te (DETe) doping using atomic force microscopy, and electrical and optical properties measurements. The degree of order decreases for T... | Surfaces; Te doping; Bandgap energy | 1998 | |

15 | Myers, Chris J. | Efficient verification of hazard-freedom in gate-level timed asynchronous circuits | Abstract-This paper presents an efficient method for verifying hazard-freedom in gate-level timed asynchronous circuits. Timed circuits are a class of asynchronous circuits that are optimized using explicit timing information. In asynchronous circuits, correct operation requires that there are no ha... | 2007 | ||

16 | Mathews, V. John | An efficient algorithm for lattice filter/predictor | ABSTRACT An efficient method for updating the lattice filter/predictor coefficients using the sign algorithm is introduced. The pertinent coefficients are updated using only the signs of the estimation errors at each stage. This method requires less number of multiplications than other adaptive la... | 1985 | ||

17 | Stringfellow, Gerald B. | Heterostructures in GaInP grown using a change in V/III ratio | A natural monolayer 111% superlattice -- the CuPt ordered structure -- is formed spontaneously during organometallic vapor phase epitaxial OMVPE growth of Ga0.52In0.48P. The extent of this ordering process is found to be a strong function of the input partial pressure of the phosphorus precursor dur... | Superlattices; Alloys; Atomic ordering; Heterostructures | 1997-02-24 | |

18 | Myers, Chris J. | Analog decoding of product codes | A design approach is presented for soft-decision decoding of block product codes ("block turbo codes") using analog computation with MOS devices. Application of analog decoding to large code sizes is also considered with the introduction of serial analog interfaces and pipeline schedules. | 2001 | ||

19 | Stringfellow, Gerald B. | Thermodynamic aspects of organometallic VPE | Organometallic vapor phase epitaxy (OMVPE) is a new crystal growth technique which is rapidly gaining popularity due to its simplicity, flexibility and proven ability to grow excellent quality III/V compounds and alloys for device applications. | Organometallic vapor phase epitaxy; Thermodynamics | 1982 | |

20 | Myers, Chris J. | Synthesis of timed asynchronous circuits | In this paper we present a systematic procedure to synthesize timed asynchronous circuits using timing constraints dictated by system integration, thereby facilitating natural interaction between synchronous and asynchronous circuits. In addition, our timed circuits also tend to be more &dent, in b... | 1993 | ||

21 | Mathews, V. John | On the inversion of certain nonlinear systems | Abstract-In this letter, we present some theorems for the exact inversion and the pth-order inversion of a wide class of causal, discrete-time, nonlinear systems. The nonlinear systems we consider are described by the input-output relationship y(n) = g[x(n)]h[x(n - 1); y(n - 1)]+f[x(n - 1); y(n - 1)... | 1997 | ||

22 | Furse, Cynthia M.; Gandhi, Om P. | Improvements to the finite-difference time-domain method for calculating the radar cross section of a perfectly conducing target | The finite-difference time-domain (FDTD) method has been used extensively to calculate scattering and absorption from both dielectric objects and perfectly conducting objects. Several improvements to the FDTD method for calculating the radar cross section (RCS) of a perfectly conducting target are p... | Finite-difference time-domain; FDTD | 1990-01-01 | |

23 | Mathews, V. John; Dubow, Joel | A stable adaptive Hammerstein filter employing partial orthogonalization of the input signals | Abstract This paper presents an algorithm that adapts the parameters of a Hammerstein system model. Hammerstein systems are nonlinear systems that contain a static nonlinearity cascaded with a linear system. In this work, the static nonlinearity is modeled using a polynomial system and the linear f... | 2002 | ||

24 | Furse, Cynthia M.; Gandhi, Om P.; Lazzi, Gianluca | FDTD computation of power deposition in the head for cellular telephones | The finite-difference time-domain method is used to calculate radiation pattern and specific absorption rate (SAR) in the human head due to cellular telephones. For realistic simulation of the ordinary positions of holding the phone, the ear of the model is pressed against the head, the head is tilt... | Finite-difference time-domain method; FDTD; Specific absorption rate; Radiation patterns; Human head model; Power deposition | 1996 | |

25 | Myers, Chris J. | Learning genetic regulatory network connectivity from time series data | Abstract-Recent experimental advances facilitate the collection of time series data that indicate which genes in a cell are expressed. This information can be used to understand the genetic regulatory network that generates the data. Typically, Bayesian analysis approaches are applied which neglect ... | 2011 |