Christopher Howells Email & Phone Number

Aurora, CO, US

Lakewood, CO

• Prototyping image acquisition and processing framework in C++.
• Exploring and testing image processing techniques via Python bindings to open source drivers and OpenCV—in particular, exploring the use of edge detection and filtering methods.
• Designed and implemented an adaptive controller in C++.o Patent: Gain in separation processes with control loop, US 20150273128, Oct 1, 2015.
• Created Python extensions to wrap iterative prediction module, enabling simulations off target.
• Implemented data interface for model component in model-view-controller of GUI
• Corrected a variety of software defects, becoming exposed and familiar with driver-level code, and safety-critical software components

Aurora, CO

• Implemented in C++ and Matlab an image processing engine for processing and analyzing image data sets for quantification of CT-induced density changes to normal liver tissue surrounding tumorso Devising home-grown.
• Created Python package to load and visualize multiple computed tomography (CT) and positron emission tomography (PET) image sets
• Conveyed and developed design inputs according to user needs of attendees and residents in clinic
• Debugged, tested, and documented software to maximize usefulness and portability for future medical physicists' projects
• Presented abstract to the American Association of Physicists in Medicine (AAPM)/Canadian Organization of Medical Physicists (COMP) conference in Vancouver, Canada
• "Normal liver tissue density dose response in patients treated with stereotactic body radiation therapy for liver metastases." Int J Radiat Oncol Biol Phys., 84, e441-e446 (2012)

Blacksburg, VA

• Assembled an interdisciplinary team of engineers and biologists to model and analyze a biological pathway intrinsic to cellular death
• Used Matlab to simulate extent of dynamics of network as well as estimate parameter spaces that lead to certain bifurcation patterns (which have certain cancer-associated implications)
• "The Bcl-2-associated death promoter (BAD) lowers the threshold at which the Bcl-2-interacting domain death agonist (BID) triggers mitochondria disintegration." Journal of Theoretical Biology, 271, p. 114-123 (2011)

Blacksburg, VA

• For Digital Signal Processing course, I worked in a small team to set up a bundle of software scripts which allowed easy building and integration of user-supplied and user-designed audio filter parameters to DSP 2181.
• Presented supplemental lectures, recitations, and review sessions
• Test and solution preparations, grading
• Courses included Digital Signal Processing, Signals and Systems, Continuous and Discrete Systems, Electronics, Electromagnetic Fields, Electrical Theory, Control Systems, Communication Systems

Blacksburg, VA

• Designed, analyzed, and simulated a nonlinear controller for a magnetostrictor transducer device which was to be embedded in a 200V DC-DC buck drive amplifier
• Simulated results in Simulink and then in PSpice
• "Nonlinear compensation of quadratic behavior in a magnetostrictor material. Proc. SPIE, 5757, p. 77 (2005)"

Charlottesville, VA

• Troubleshot power supplies for PLCs and made circuit board modifications such as RC snubbers
• Ran electrostatic discharge, thermal, and shock and vibration tests on PLCs and prepared CE and UL mark reports
• Aided engineer in the re-design of an analog control loop using a microcontroller

Point Pleasant, WV

• Collection and analysis of water samples (with respect to pH, conductivity, salinity, turbidity, oxygen, etc.)

Ph.D., Electrical Engineering

Activities and Societies: Institute for Electrical & Electronics Engineers (IEEE)• Invented new theorem or corollary characterizing the.

M.S., Electrical Engineering

• Formulated, analyzed, and simulated in Matlab various collision avoidance strategies using differential game theory, for an autonomous.

B.S., Mathematics

B.S., Electrical Engineering

Activities and Societies: Astronomy club