VENKATARAMA KRISHNANPROFESSIONAL VITAE |
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VENKATARAMA KRISHNANPROFESSIONAL VITAE |
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Princeton University, U.S.A.
1959 - M.S.E. Electrical Engineering
Banaras Hindu University, India
1953 - B.Sc.(Engg) (First Class) Electrical Engineering
Madras University, India
1948 - B.Sc. (First Class) Chemistry (Major), Physics, Mathematics
& English (Minors)
2. Academic Experience (Institution, date, rank) 
Back
3. Industrial experience (Institution, date, rank)
1. Professional Associations Participation (Papers presented in Conferences)
2. Non-Teaching Activities (Consulting and other professionally related work)
3. Professional Honors and Awards
CITA Grant for $5,000 - 1994
Bell Laboratories Education Grant, $100,000 - 1968-70
NASA Grant on Strapdown Systems, 100,000 - 1964
2. Academic and Professional Publications: Back
3. Research or Creative Activities
ESTIMATION OF STEADY STATE QUEUE DISTRIBUTIONS: Correlated traffic was modeled using linear and threshold autoregressive processes, models for multiplexed variable bit rate (VBR) encoded streams were used to develop an approach for estimating buffer occupancy and the impact of correlated arrivals on delay distribution of buffer occupancy were investigated. Using methods based on probability theory and time series analysis computational techniques were developed for estimating the steady state queue distributions.
MEDICAL IMAGING: Reconstruction of images in Transmission Computed Tomography (TCT) and Emission Computed Tomography (ECT) using statistical techniques were undertaken. Bayesian Maximum A Posteriori techniques were implemented by applying the Expectation Maximization Iterative algorithm. Three types of priors used were, the Gibbs Prior, the cross entropy distance prior and hybrid prior. The potential functions used in the Gibbs prior were the sigmoid and the lncosh function and the parameter settings were optimized for TCT and ECT. Computer simulations were performed on phantoms in 2-D and 3-D object spaces. The quantitative accuracy and resolution of the reconstructed images were considerably improved. The problem of incomplete projections was solved by first using a linear prediction extrapolation scheme and then reconstruction was achieved from the completed projections. The results were quite satisfactory. See CACT Report T94-01
PROBABILISTIC AND STOCHASTIC SYSTEMS: Using martingale theory, developed stochastic differential equations satisfied by smoothed estimates in a general model, derived stochastic differential equations in time delay systems, studied properties of conditional distributions in linear models, and formulated a general class of fault detection problems. Fundamental investigations on the martingale approach to nonlinear filtering and smoothing has been published as a book in 1984 by John Wiley and Sons, New York, under the title, "Nonlinear Filtering and Smoothing". This book was republished with a new preface and errata sheets by Dover Publications in 2005. Introduced time series analysis methods for modeling gyro drift angle data and for modeling an aircraft traversing a runway. Performed extensive analysis of data using statistical modeling by means of two factor experiments to determine the effects of parameters on system performance. Generalized Bartlett's formula in estimation of autocovariance functions and developed new confidence limits for testing for white noise. Investigated navigational sonar system position and velocity estimation errors and established confidence limits. Investigated the distribution of spectral estimators and established their confidence limits. Developed causal probability models for reducing the lateral separation of aircraft in transoceanic flight. Developed and taught courses in probability, stochastic processes, martingales, nonlinear estimation and adaptive estimation with applications to real world problems.
DIGITAL SYSTEMS: Using Butterworth and Chebyshev filters, successfully completed the problem of improving the estimation accuracy of multiple linear regression coefficients in presence of sinusoids and noise. Confidence limits on these regression coefficients were established on the assumption of correlated and uncorrelated noise. Completed investigations on fast Fourier transforms (FFT) and used these techniques for the problem of reconstructing an object from its shadowgraph. Using linear prediction techniques and FFT, complete image reconstructions for different types of truncated data were realized. Presently engaged in Single Photon Emission Tomographic Studies for missing data. Performed fundamental studies on Hilbert transform and developed Hilbert series and obtained a technique for phase refinement. Developed courses on FFT techniques and digital signal processing.
BIOSYSTEMS: Developed and constructed a ballistocardiograph to measure cardiac output non-invasively. Reduced false negative responses obtained from scanners used in detection of tumors. Modeled electrocardiograph (EKG) and electro-encephalograph (EEG) signals using time series.
AEROSPACE SYSTEMS: Investigated problems on error analyses of inertial navigation systems, weather satellite systems and reconnaissance satellite systems. Improved the fire-control accuracy of navigation to guidance transfer by developing several adaptive adjustment methods. Performed extensive research on strap-down inertial navigation systems and associated alignment problems. Developed and taught courses on inertial navigation and guidance systems. Supervised two doctoral dissertations and over twenty master's theses in this area.
CONTROL SYSTEMS: Completed investigations on an aircraft attitude control system with particular reference to the determination of pole sensitivities of various feedback loops. Instrumentation studies on measurement of angular velocity using accelerometers were completed. Developed and taught courses on control systems, optimal control, nonlinear control and estimation theory.
COMMUNICATION SYSTEMS: Studied the problem of interference in the transmission of information. Developed and taught courses on theory of communications and statistical theory of communications.
1. Teaching (Courses taught, # years, UG-G levels)
| Regular Graduate Courses Back |
Special Graduate Courses | Undergraduate Courses Back |
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Probability & Random Processes Stochastic Modeling in Telecommunications Time Series Analysis & Forecasting Statistical Theory of Communications Discrete Mathematics Linear Systems Adaptive Estimation Algorithms Theory of Communications Control System Synthesis Inertial Navigation & Guidance Optimal Control Theory Theory of Optimization |
Fast Fourier Transforms Convergence of Probability Measures Martingales & Nonlinear Estimation Applications of Time Series Applications of Probability Estimation Theory Wavelets and Applications |
Calculus - I Circuit Theory Signals and Systems Introductory Statistics Differential Equations Electromagnetic Field Theory Electronic Circuits Complex Variables Feedback Control Systems Electrical Engineering Laboratory Electromechanical Systems Chemistry |
2. Other Activity and Accomplishments Related to Instructional Function
Continuing Education Program for Grumman Aircraft:
1966-67, 10 Lectures on Basic and Advanced Control Theory
1967-68, 8 Lectures on Basic and Advanced Control Theory
Advanced Mathematics Program at Fort Monmouth:
1969-70 14 Lectures on Optimization Theory
Continuing Education Program of the Indian Institute of Science:
1972, 3 Lectures on case studies on Linear Programming
1972, 6 Lectures on Inertial Navigation & Guidance delivered
at the Indian Institute of Technology, Madras
1973, 7 Lectures on Passive Networks
1974, 1 Lecture on Philosophy of Probability
1977, 13 Lectures on Time Series Analysis and Stochastic Modeling
1977, 2 Lectures on Forecasting Techniques
1977, 3 Lectures on Fast Fourier Transforms
1977, 3 Lectures on Time Series Analysis at University of Roorkee
1977, 3 Lectures on Applications of Fast Fourier Transforms
1981, 10 Lectures on Biosignal Processing
1982, 24 Lectures on Probability , Time Series Analysis and Forecasting
Forecasting Special Program organized at the Indian Institute of Science
1977 Designed and organized a program on "Time Series Analysis
and Stochastic Modeling and Forecasting"
E. SERVICE ACTIVITIES
1. Committee Activities (Dept., College or University)
2. Other Services to the University
Redesigned the web pages (http://ece.caeds.eng.uml.edu/) for the ECE Department and periodically updating the contents of the web pages. Edited the Factbook of the ECE Department. Designed the web pages and all the logos for the ECE . Drew all the floor plans for ECE Department and the maps for the vicinity of UMass Lowell -1998-2002
Took initiatives to convert the Laboratory of Advanced Computation originally started by Prof. Charles Thompson in 1987 into a Center for Advanced Computation and Telecommunications (CACT) in 1993 and was its co-director with Prof. Thompson from 1993-2002.
3. Community Activities
Lectures to neighboring high schools on the importance of engineering and explained the electrical engineering discipline in UMass Lowell, 1998-2001
Established a foreign students hospitality committee in Princeton University and was its first chairman, 1957-59
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