Publications
2022 
S. Critcher, T.J. Freeborn, "System Performance and User Feedback Regarding Wearable Bioimpedance System for MultiSite Knee Tissue Monitoring: FreeLiving Pilot Study with Healthy Adults," Front. Electron., vol. 3, 824981, 2022.

2020 
N. Herencsar, T.J. Freeborn, A. Kartci, O. Cicekoglu, "A comparative study of two fractionalorder equivalent electrical circuits for modeling the electrical impedance of dental tissues," Entropy, vol. 22, no. 10, 1117, 2020.
B. Fu, T.J. Freeborn, "Coleimpedance parameters representing biceps tissue bioimpedance in healthy adults and their alterations following eccentric exercise," J. Adv. Res., vol. 25, pp. 285293, 2020. R.J. Mathews, T.J. Freeborn, "Modeling and experimental validation of parasitic capacitance effects on emulated bioimpedance measurements with highimpedance residuals," Int. J. Circuit Theory Appl., vol. 48, no. 7, pp. 10571069, 2020. T.J. Freeborn, G. Regard, B. Fu, "Localized bicep tissue bioimpedance alterations following eccentric exercise in healthy young adults," IEEE Access, vol. 8, pp. 2310023109, 2020. 
2018

D. Kubanek, T.J. Freeborn, J. Koton, J. Dvorak, "Validation of fractionalorder lowpass elliptic responses of (1+α)order analog filters," Appl. Sci., vol. 8, no. 12, 2603, 2018.
T.J. Freeborn, B. Fu, "Fatigueinduced Cole electrical impedance model changes of biceps tissue bioimpedance," Fractal Fract., vol. 2, no. 4, 27, 2018. A. Allagui, T.J. Freeborn, A.S. Elwakil, M.E. Fouda, B.J. Maundy, A.G. Radwan, Z. Said, M.A. Abdelkareem, "Review of fractionalorder electrical characterization of supercapacitors," J. Power Sources, vol. 400, pp. 457467, 2018. T.J. Freeborn, A. Milligan, M. Esco, "Evaluation of ImpediMed SFB7 BIS device for lowimpedance measurements," Meas., vol. 129, pp. 2030, 2018. D. Kubanek, T. Freeborn, J. Koton, N. Herencsar, “Evaluation of (1 + α) fractionalorder approximated Butterworth highpass and bandpass filter transfer functions,” Elektronika ir Elektrotechnika, vol. 24, no. 2, pp. 3741, 2018. B. Fu, T.J. Freeborn, "Biceps tissue bioimpedance changes from isotonic exerciseinduced fatigue at different intensities," Biomed. Phys. Eng. Express., vol. 4, no. 2, 025037, 2018. T.J. Freeborn, T. Crenshaw, S. Critcher, "Hook artifact correction of localized electrical bioimpedance for improved agreement between different device measurements," Biomed. Phys. Eng. Express, vol. 4, no. 1, 015016, 2018. D. Kubanek, T.J. Freeborn, "(1+α) fractionalorder transfer functions to approximate lowpass magnitude responses with arbitrary quality factor," Int. J. Electron. Commun. (AEU), vol. 83, pp. 570578, 2018. M.R. Esco, H.N. Williford, A.A. Flatt, T.J. Freeborn, F.Y. Nakamura, "Ultrashortened timedomain HRV parameters at rest and following exercise in athletes: An alternative to frequency computation of sympathovagal balance," Eur. J. Appl. Phys., vol. 118, no. 1, pp. 175184, 2018. A.A. AlAli, A.S. Elwakil, B.J. Maundy, T.J. Freeborn, "Extraction of phase information from magnitudeonly bioimpedance measurements using a modified KramersKronig transform," Circuits Syst. Signal Process., vol. 37, no. 8, pp. 36353650, 2018. 
2017

A. Allagui, A.S. Elwakil, T.J. Freeborn, "Supercapacitor reciprocity and response to linear current and voltage ramps," Electrochim. Acta, vol. 258, pp. 10811085, 2017.
A.S. Elwakil, A. Allagui, T.J. Freeborn, B.J. Maundy, "Further experimental evidence of the fractionalorder energy equation in supercapacitors," Int. J. Electron. Commun. (AEU)., vol. 78, pp. 209212, 2017. C. Vastarouchas, G. Tsirimokou, T.J. Freeborn, C. Psychalinos, "Emulation of a electricalanalogue of a fractionalorder human respiratory mechanical impedance model using OTA topologies," Int. J. Electron. Commune. (AEU), vol. 78, pp. 201208, 2017. T.J. Freeborn, A.S. Elwakil, B. Maundy, "Variability of Colemodel bioimpedance parameters using magnitudeonly measurements of apples from a twoelectrode configuration," Int. J. Food Properties, vol. 20, no. S1, pp. S507S519, 2017. B.S. Nickerson, M.R. Esco, B.M. Kliszczewicz, T.J. Freeborn, "Comparison of bioimpedance and underwater weighing body fat percentage before and acutely after exercise at varying intensities," J. Strength Cond. Res., vol. 31, no. 5, pp. 13951402, 2017. A. Elwakil, A. Radwan, T.J. Freeborn, A. Allagui, B. Maundy, M. Fouda, "Lowvoltage commercial supercapacitor response to periodic linearwithtime current excitation: a case study," IET Circuits Devices Syst., vol. 11, no. 3, pp. 189195, 2017. 
2016

A. Allagui, T.J. Freeborn, A.S. Elwakil. B. Maundy, "Reevaluation of performance of electric doublelayer capacitors from constant current charge/discharge and cyclic voltammetry," Sci. Rep., 6, 38568, 2016.
A. Lemmon, T.J. Freeborn, A. Shahabi, "Fixturing impacts on high frequency lowresistance, lowinductance impedance measurements," Electron Lett., vol. 52, no. 21, pp. 17721774, 2016. T.J. Freeborn, "Estimating supercapacitor performance for embedded applications using fractionalorder models" Electron. Lett., vol. 52, no. 17, pp. 14781480, 2016. [Corrigendum] A. Allagui, A.S. Elwakil, B. Maundy, T.J. Freeborn, "Spectral capacitance of series and parallel combinations of supercapacitors," ChemElectroChem, vol. 9. no. 3, pp. 14291436, 2016. G. Tsirimokou, C. Psychalinos, T.J. Freeborn, A.S.Elwakil "Emulation of current excited fractionalorder capacitors and inductors using OTA topologies" Microelectron. J., vol. 5, pp. 7081, 2016. T.J. Freeborn, "Comparison of (1+α) fractionalorder transfer functions to approximate lowpass Butterworth magnitude responses," Circuits Syst. Signal Process., vol. 35, no. 6, pp. 19832002, 2016. T.J. Freeborn, A.S. Elwakil, B. Maundy, "Approximated fractionalorder inverse Chebyshev filters," Circuits Syst. Signal Process., vol. 35, no. 6, pp. 19731982, 2016. T.J. Freeborn, A.S. Elwakil, B. Maundy, "Compact wide frequency range fractionalorder models of human body impedance against contact currents," Math. Prob. Eng., vol. 2016, Article ID 4967937, 2016. 
2015

T.J. Freeborn, B. Maundy, A.S. Elwakil, "Fractionalorder models of supercapacitors, batteries, and fuel cells: a survey," Mater. Renew. Sustain. Energy, vol. 4, no. 3, 2015.
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Approximated fractional order Chebyshev lowpass filters," Math. Prob. Eng., vol. 2015, Article ID 832468, 2015. 
2014

T.J. Freeborn, B. Maundy, A.S. Elwakil, "Extracting the parameters of the doubledispersion Cole bioimpedance model from magnitude response measurements," Med. Biol. Eng. Compute., vol. 52, no. 9, pp. 749758, 2014.

2013

T.J. Freeborn, B. Maundy, A.S. Elwakil, "Cole impedance extractions from stepresponse of a current excited fruit sample," Compute. Electron. Agric., vol. 98, pp. 100108, 2013.
T.J. Freeborn, "A survey of fractionalorder circuit models for biology and biomedicine," IEEE J. Emerging Sel. Top. Circuits Syst., vol. 3, no. 3, pp. 416424, 2013. T.J. Freeborn, B. Maundy, A.S. Elwakil, "Measurement of supercapacitor fractionalorder model parameters from voltage excited step response," IEEE J. Emerging Sel. Top. Circuits Syst., vol. 3, no. 3, pp. 367376, 2013. T.J. Freeborn, B. Maundy, "Incorporating FPAAs into laboratory exercises for analogue filter design," Int. J. Electr. Eng. Educ., vol. 50, no. 2, pp. 188200, 2013. T.J.Freeborn, B. Maundy, A.S. Elwakil, "Fractional resonancebased RLβCα filters," Math. Prob. Eng., vol. 2013, Article ID 726721, 2013. 
2012

T.J. Freeborn, B. Maundy, A.S. Elwakil, "Least squares estimation technique of ColeCole parameters from step response," Electron. Lett., vol. 48, no. 13, pp. 752754, 2012.
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Fractional TowThomas biquad filters," Nonlinear Theor. Appl., IEICE, vol. 3, no. 3. pp. 357374, 2012. 
2011

T.J. Freeborn, B. Maundy, A.S. Elwakil, "Numerical extraction of the ColeCole impedance parameters from step response," Nonlinear Theor. Appl., IEICE, vol. 2, no. 4. pp. 548561, 2011.
B. Maundy, A.S. Elwakil, T.J. Freeborn, "On the practical realization of higherorder filters with fractional stepping," Signal Process., vol. 91, no. 3, pp. 484491, 2011. 
2010

T.J. Freeborn, B. Maundy, A.S. Elwakil, "Field programmable analogue array implementation of fractional step filters," IET Circuits Devices Syst., vol. 4, no. 6, pp. 514524, 2010.

Conferences
2022 
T.J. Freeborn, M. Gosa, D. McCallum, E. Steele, "Student satisfaction and perceptions of summer REU experience in an engineering/communicative disorders focused site at program midpoint," ASEE Ann. Conf. & Expo, Minneapolis, U.S.A., 2022.
T.J. Freeborn, "Impact of COVID19 pandemic on instructor course preparation time during transition to asynchronous and flippedstyle lectures: a case study," ASEE Ann. Conf. & Expo, Minneapolis, U.S.A., 2022. T.J. Freeborn, "Student progress after a learning in advance course to prepare engineering students for circuit analysis in electrical engineering," ASEE Ann. Conf. & Expo, Minneapolis, U.S.A., 2022. 
2021 
T.J. Freeborn, S. Critcher, G. Hooper, "ShortTerm Segmental Bioimpedance Alterations During 6° HeadDown Tilt," Int. Conf. IEEE Eng. Medicine Biology Society, [Virtual], 2021.
T.J. Freeborn, S. Critcher, "Threshold and Trend Artifacts in Localized MultiFrequency Bioimpedance Measurements", IFAC Symp. Biological and Medical Syst., Ghent, Belgium [Virtual], 2021. T.J. Freeborn, S. Critcher, "Bioimpedance Alterations of Knee Site Tissues During Dynamic Activity of Varying Intensity," Int. Conf. Telecommune. Signal Process., [Virtual], 2021. T.J. Freeborn, M. Gosa, "WorkinProgress: Social and Cultural Activities Integrated into an REU Site in the U.S. South," ASEE Annual Conf. & Expo, [Virtual], 2021. T.J. Freeborn, "Participation with Asynchronous Online Lectures for an Electric Networks Summer Course in the COVID Pandemic," ASEE Southern Section Ann. Conf., [Virtual], 2021. S. Critcher, T.J. Freeborn, "Residual impedance impact on MAX30001 accuracy for bioimpedance applications," IEEE LatinAmerican Symp. Circuits Syst., Arequipa, Perú, [Virtual], 2021. T.J. Freeborn, S. Critcher "Estimating Coleimpedance parameters from limited frequencyband impedance measurements," IEEE LatinAmerican Symp. Circuits Syst., Arequipa, Perú, [Virtual], 2021.

2020

S. Critcher, T.J. Freeborn, "Multisite impedance measurement system based on MAX30001 integrated circuit," IEEE Midwest Symp. Circuits Syst., pp. 381386, Springfield, U.S.A., [Virtual], 2020.
B. Fu, A. Shahabi, T.J. Freeborn, A.N. Lemmon, M.C. Kisacikoglu, "Experimental validation of CTsnubber for multischip SiC MOSFET power module," IEEE Midwest Symp. Circuits Syst., pp. 419423, Springfield, U.S.A, [Virtual], 2020. R. Buckreus, S. Jimenez, M. Kisacikoglu, A. Lemmon, T.J. Freeborn, "Flexible overcurrent protection scheme for mediumvoltage WBG power modules in DPT application," IEEE Transportation Electrification Conference and Expo, pp. 11171122, Chicago, U.S.A., [Vitual], 2020. S. Critcher, T.J. Freeborn, "Shortterm evaluation of dry electrodes fabricated using flexible printed circuits processes for bioimpedance measurements," IEEE Southeast Con., Raleigh, U.S.A., [Virtual], 2020. D. Schweiger, S. Critcher, T.J. Freeborn, E. Hibberd, "Throwing event detection using acceleration magnitude using wristworn sensors," IEEE Southeast Con., Raleigh, U.S.A., [Virtual], 2020. T.J. Freeborn, M. Gosa, D. McCallum, E. Steele, "Speech pathology clinical shadowing and research experiences for undergraduate engineers & computer scientists," ASEE Southern Section Ann. Conf., Auburn, U.S.A., 2020. T.J. Freeborn, S. Burkett, D. McCallum, E. Steele, Y. Qin, "Challenges integrating entrepreneurial training into summer research experiences for undergraduate engineering students," ASEE Southern Section Ann. Conf., Auburn, U.S.A., 2020. T.J. Freeborn, S. Burkett, D. McCallum, E. Steele, S. Dunlap, P. Hubner, A. Musaev, P. Sobecky, "Preliminary feedback on learning in advance courses to prepare engineering students for gateway courses," ASEE Southern Section Ann. Conf., Auburn, U.S.A., 2020. 
2019 
D. Kubanek, T.J. Freeborn, J. Koton, J. Dvorak, "Transfer Functions of FractionalOrder BandPass Filter with Arbitrary Magnitude Slope in Stopband," IEEE Int. Conf. Telecommun. Signal Process., pp. 655659, Budapest, Hungary, 2019.
B. Fu, T.J. Freeborn, "Electrical equivalent network modeling of forearm tissue bioimpedance," IEEE Southeast Con., Huntsville, U.S.A. 2019. N. Kitchin, T.J. Freeborn, "Contraction Artifacts on Biceps Tissue Bioimpedance Collected using SteppedSine Excitations," IEEE Southeast Con, Huntsville, U.S.A., 2019. R.J. Mathews, T.J. Freeborn, "Analysis of Parasitic Capacitances Impact on Estimating ColeModel Impedances using Tetrapolar Measurements," IEEE Southeast Con, Huntsville, U.S.A., 2019. G. Regard, T.J. Freeborn, "Biceps Tissue Electrical Resistance and Circumference Changes Following an Eccentric Exercise Protocol," IEEE Southeast Con, Huntsville, U.S.A., 2019. 
2018 
J. Koton, J.H. Stavnesli, T.J. Freeborn, "Performance analysis of Oustaloup approximation for the design of fractionalorder analogue circuits," Int. Cong. Ultra Modern Telecommune. Control Systems Workshop, Moscow, Russia, 2018.
B. Fu, T.J. Freeborn, "Estimating localized bioimpedance with measures from multiple redundant electrode configurations," Int. Conf. IEEE Eng. Med. Biol. Soc., pp. 43514354, Honolulu, U.S.A., 2018. T.J. Freeborn, D. Kubanek, J. Koton, J. Dvorak, "Fractionalorder lowpass elliptic responses of (1+α)order transfer functions," IEEE Int. Conf. Telecommun. Signal Process., pp. 346349, Athens, Greece, 2018. T.J. Freeborn, M. Gosa, "Work in Progress: Pilot Shadowing Experiences to Introduce Engineering Students to SpeechLanguage Pathology," ASEE Annual Conf. & Expo, Salt Lake City, U.S.A., 2018. S.L. Burkett, S. Gerster, T.J. Freeborn, E.R. Giannini, R.M. Frazier, D.M. McCallum, G. Quenneville, "Renewable Resources: Theme with Broad Societal Impact for REU Students," ASEE Annual Conf. & Expo, Salt Lake City, U.S.A., 2018. T.J Freeborn, A.S. Elwakil, A. Allagui, "Supercapacitor fractionalorder model discharging from polynomial timevarying currents," IEEE Int. Symp. Circuits Syst., Florence, Italy, 2018. T.J Freeborn, G.W. Bohannan, "Changes of fractionalorder model parameters in biceps tissue from fatiguing exercise," IEEE Int. Symp. Circuits Syst., Florence, Italy, 2018. 
2017 
T.J Freeborn, A. Allagui, A.S. Elwakil, "Modelling supercapacitors leakage behaviour using a fractionalorder model", Euro. Conf. Circuit Theor. Design, Catania, Italy, 2017.
C. Vastarouchas, G. Tsirimokou, T.J. Freeborn, C. Psychalinos, A.S. Elwakil, "Design of a wood tissue impedance emulator in monolithic form," Euro. Conf. Circuit Theor. Design, Catania, Italy 2017. T.J. Freeborn, A.S. Elwakil, "Variability of supercapacitor fractionalorder parameters extracted from discharging behavior using least squares optimization," IEEE Int. Symp. Circuits Syst., pp. 15101513, Baltimore, U.S.A,, 2017. S. Critcher, T.J. Freeborn, "Variability of electrical impedance measurements collected from human forearm using multiple electrode configuration," Southern Biomed. Eng. Conf., pp. 172175, Gulfport, U.S.A., 2017. T. Crenshaw, T.J. Freeborn, "Effects of muscle fatigue on electrical impedance of bicep muscles during exercises of varying intensity: a case study," Southern Biomed. Eng. Conf., pg. 183187, Gulfport, U.S.A., 2017. R.J. Mathews, T.J. Freeborn, "Effect of muscle engagement and measurement position on electrical impedance of thigh muscles," Southern Biomed. Eng. Conf., pg. 168171, Gulfport, U.S.A., 2017. 
2016 
T.J. Freeborn, A.S. Elwakil, C. Psychalinos, "Analysis of a rectifier circuit realized with a fractionalorder capacitor," IEEE Int. Conf. Microelectron., pp. 3336, Cairo, Egypt, 2016.
B.J. Maundy, A.S. Elwakil, T.J. Freeborn, A. Allagui, "Improved method to determine supercapacitor metrics from highpass filter response," IEEE Int. Conf. Microelectron., pp. 2528, Cairo, Egypt, 2016. T.J. Freeborn, A.S. Elwakil, B. Maundy, "Electrode location impact on Coleimpedance parameters using magnitudeonly measurements," IEEE Midwest Symp. Circuits Syst., pg. 2124, Abu Dhabi, United Arab Emirates, 2016. T.J. Freeborn, A.S. Elwakil, B. Maundy, "Factors impacting accurate Coleimpedance extractions from magnitudeonly measurements," IEEE Conf. Systems Man Cybernetics, pp. 223227, Budapest, Hungary, 2016. B. Maundy, A.S. Elwakil, T.J. Freeborn, A. Allagui, "Determination of supercapacitor metrics using a magnitudeonly method," IEEE Int. Symp Circuits Syst., pp. 11861189, Montreal, Canada, 2016. 
2013 
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Simplifying Coleimpedance extractions from the currentexcited step response," IEEE Midwest Symp. Circuits Syst., pp. 952955, Columbus, U.S.A, 2013.
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Accurate time domain extraction of supercapacitor fractionalorder model parameters," IEEE Int. Symp. Circuits Syst., pp. 22592262, Beijing, China, 2013. 
2012 
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Improved ColeCole parameter extraction from frequency response using least squares fitting," IEEE Int. Symp. Circuits Syst., pp. 337340, Seoul, South Korea, 2012.

2010 
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Second order approximation of the fractional Laplacian operator for equalripple response," IEEE Midwest Symp. Circuits Syst., pp. 11731176, Seattle, U.S.A, 2010.
T.J. Freeborn, B. Maundy, A.S. Elwakil, "Towards the realization of fractional step filters," IEEE Int. Symp. Circuits Syst., pp. 10371040, Paris, France, 2010. 
Book Chapters
2020 
T.J. Freeborn, "Fatigue Monitoring Techniques using Wearable Systems" in Wearable Sensors: Fundamentals, Implementation and Applications (2nd Edition), Editor: E. Sazonov, pp. 575589, 2020, Academic Press.

2018 
T.J. Freeborn, "Bioimpedance Analysis using FractionalOrder Equivalent Circuits" in Fractional Order Systems: Optimization, Control, Circuit Realizations and Applications (Advances in Nonlinear Dynamics and Chaos), Editors: A.T. Azar, A.G. Radwan, S. Vaidyanathanpp, pp. 205237, 2018, Academic Press.

2013 
T.J. Freeborn, B. Maundy, A.S. Elwakil, "FractionalStep Analog Filter Design" in Analog/RF and Mixed Signal Circuit Systemic Design (Lecture Notes in Electrical Engineering, vol. 233), Editors: M. Fakhfakh, E. TleloCuautle, R. CastroLopez, pp. 243267, 2013, Springer.

Theses
2013

T.J. Freeborn, "Indirect measurement of fractional impedances," Ph.D. thesis, Dept. Electrical & Computer Engineering, University of Calgary, Calgary, Canada, 2013.

2010 
T.J. Freeborn, "Design and implementation of fractionalstep filters," M.Sc. thesis, Dept. Electrical & Computer Engineering, University of Calgary, Calgary, Canada, 2010.

Supervised Student Theses
2022 
S. Critcher, "Freeliving Bioimpedance and Pain Assessment of Healthy and Osteoarthritis (OA) Groups," Ph.D. thesis, Dept. Electrical & Computer Engineering, The University of Alabama, Tuscaloosa, AL, USA, 2022.

2020 
B. Fu, "Bioimpedance Applied on Skeletal Muscle Assessing to Resistance Training Effects," Ph.D. thesis, Dept. Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL, USA, 2020.
S. Critcher, "Design and Evaluation of a Wearable Bioimpedance System for Monitoring Multiple Localized Knee Tissue Sites," M.S. thesis, Dept. Electrical & Computer Engineering, The University of Alabama, Tuscaloosa, AL, USA, 2020. 
2019 
R.J. Mathews, "An Analysis of Parasitic Capacitances in Bioimpedance Spectroscopy and Their Impact on Impedance Measurements," M.S. thesis, Dept. Electrical & Computer Engineering, The University of Alabama, Tuscaloosa, AL, USA, 2019.

Note: Authors in italics denote students under my supervision.