Peer Reviewed Journal Papers

J12

Ashkan Ashrafi, Reza Adhami and Aleksandar Milenković, “Direct Digital Frequency Synthesizers Based on the Quasi-Linear Interpolation Method”, IEEE Trans. on Circuits and Systems Part-I, Regular Papers (to appear)

J11

Yuri B. Shtessel, Parisa Kaveh and Ashkan Ashrafi, “Harmonic Oscillator Utilizing Double-Fold Integral, Traditional and Second Order sliding Mode Control”, Journal of The Franklin Institute, Vol. 346, No.9, pp. 872-888, Nov. 2009.

J10

Ashkan Ashrafi and Reza Adhami, “Theoretical Upperbound of the Spurious Free Dynamic Range in Direct Digital Frequency Synthesizers Realized by Polynomial Interpolation Methods”, IEEE Trans. on Circuits and Systems Part-I, Regular Papers, Vol. 54, No. 10, pp. 2252-2261, Oct. 2007. (PDF)

J9

Peter Meenen, Ashkan Ashrafi, and Reza Adhami, “The Utilization of a Taylor Series-Based Transformation in Fingerprint Verification,” Pattern Recognition Letters, Vol. 27, No.14, pp. 1606-1618, October 2006. (PDF)

J8

Ashkan Ashrafi and Reza Adhami, “Comments on ‘A 13-Bits Resolution ROM-Less Direct Digital Frequency Synthesizer Based on a Trigonometric Quadruple Angle Formula’,” IEEE Transactions on Very Large Scale Integration (VLSI) Systems, Vol.13, No.9, pp. 1096-1098, Sept. 2005. (PDF)

J7

Ashkan Ashrafi and Peter M. Gibson “Eigenvalues of Hadamard powers of large symmetric Pascal matrices”, Linear Algebra and its Applications, Vol. 405, pp. 60-66, August 2005. (PDF)

J6

Ashkan Ashrafi and Peter M. Gibson “An involutory Pascal matrix”, Linear Algebra and its Applications, Vol 387, pp. 277-286, August 2004. (PDF)

J5

Ashkan Ashrafi, Reza Adhami, Laurie Joiner and Parisa Kaveh, "Arbitrary Waveform DDFS Utilizing Chebyshev Polynomials Interpolation", IEEE Transactions on Circuits and Systems Part-I, Regular Papers, Vol 51, No.8, pp. 1468-1476, August 2004. (PDF)

J4

Ashkan Ashrafi and Hossein Golnabi, "A High Precision Method for Measuring Very Small Capacitance Changes", Rev. of Sci. Instrum., Vol. 70 (8), pp. 3483-87, August 1999. (PDF)

J3

H. Golnabi and A. Ashrafi, "Phase Shift Generation and Monitoring by a Simple Circuit", Rev. of Sci. Instrum., Vol. 76 (5), pp. 2017-2019, 1996. (PDF)

J2

H. Golnabi and A. Ashrafi, "Producing 180° out of Phase Signals from an Input Sinusoidal Waveform", IEEE Transactions on Instrum. and Meas., Vol. 45, No.1, pp. 312-314, Feb. 1996. (PDF)

J1

H. Golnabi and A. Ashrafi, "Theoretical Studies of Electrical Characteristics of the Nitrogen Laser", Journal of Engineering, IR Iran, Vol.7, No.3, pp. 143-153, August 1994.

Peer Reviewed Conference Papers

C14

Ujjal Bhowmik, A. Ashrafi, and Reza Adhami “A Fingerprint Verification Algorithm Using the Smallest Minimum Sum of Closest Euclidean Distance”, Proc. of the 19th International Conference on Electronics, Communications and Computers, CONIELECOMP 2009, pp. 90-95, May 2009. (PDF)

C13

A. Ashrafi, and Sudheep Thota, “A Novel Pre-Truncated Fixed-Width Digital Squarer”, Proc. of the IEEE 2008 Midwest Symposium on Circuits and Systems MWSCAS-2008, pp. 959-961, August 2008. (PDF)

C12

A. Ashrafi, A. Milenkovic and R. Adhami, “A 1GHz Direct Digital Frequency Synthesizer Based on the Quasi-Linear Interpolation Method”, Proc. of the IEEE International Symposium on Circuits and Systems ISCAS-2007, May 2007. (PDF)

C11

A. Ashrafi and R. Adhami, “An Optimized Direct Digital Frequency Synthesizer Based on Even Fourth Order Polynomial Interpolation,” Proc. of IEEE 38^th Southeastern Symposium on System Theory, pp. 109-113, March 2006. (PDF)

C10

A. Ashrafi and R. Adhami, “A Direct Digital Frequency Synthesizer Utilizing Quasi-Linear Interpolation Method,” Proc. of IEEE 37^th Southeastern Symposium on System Theory, pp. 144-148, March 2005. (PDF)

C9

P. Kaveh, A. Ashrafi and Y. Shtessel, “Robust Sliding Mode Harmonic Oscillator Suitable for Low Frequencies,” Proc. of IEEE 37^th Southeastern Symposium on System Theory, pp. 249-252, March 2005. (PDF)

C8

P. Kaveh, A. Ashrafi, Y. Shtessel, “Integral and Second Order Sliding Mode Control of Harmonic Oscillator”, Proc. of the 44^th IEEE Conference on Decision and Control and European Control Conference (CDC-ECC’05), pp. 3941 – 3946, December 2005. (PDF)

C7

P. Kaveh, A. Ashrafi and Y. Shtessel, “Robust Harmonic Oscillator Control via Integral and High Order Sliding Modes”, Proc. of the 8th International Workshop on Variable Structure Systems (VSS'04).

C6

Ashkan Ashrafi, Zexin Pan, Reza Adhami and B. Earl Wells, “A Novel ROM-less DDFS Based on Chebyshev Polynomial Interpolation”, Proc. of the IEEE 36^th Southeastern Symposium on System Theory, pp. 393-397, March 2004. (PDF)

C5

Ashkan Ashrafi, Reza Adhami and Paul Cox, “A Simple Wide-Band Frequency Independent Quadrature Phase Shifter”, Proc. of the IEEE 34^th Southeastern Symposium on System Theory, March 2002. (PDF)

C4

Hossein Golnabi, A. Ashrafi and Habib. Golnabi, "Fiber Optic Sensing of Displacement and Pressure", Proc. of the 6th International Conference on Flexible Automation and Intelligent Manufacturing (FAIM'96), Begell House, New York, pp. 149-158, 1996.

C3

H. Golnabi and A. Ashrafi, "Design and Construction of a Reliable Fiber Optic Sensor", Proc. of the 5th International Conference on Flexible Automation and Intelligent Manufacturing (FAIM'95), Begell House, New York, pp. 910-917, 1995.

C2

H. Golnabi and A. Ashrafi, "Theoretical and Experimental Investigation of a Computer-Controlled Angle Tuning System", Proc. of the 4th International Conference on Flexible Automation and Integrated Manufacturing (FAIM'94), Begell House, New York, pp. 834-843, 1994.

C1

H. Golnabi and A. Ashrafi, "The Role of Sensor Systems in Automated Manufacturing", Proc. of the 4th International Conference on Flexible Automation and Integrated Manufacturing (FAIM'94), Begell House, New York, pp. 646-654, 1994.