Valencia Koomson | |
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Alma mater | Massachusetts Institute of Technology (BS, MEng) University of Cambridge (MPhil, PhD) |
Occupation | Engineer |
Engineering career | |
Institutions | |
Website | engineering |
Valencia Joyner Koomson is an associate professor in the Department of Electrical and Computer Engineering and an adjunct professor in the Department of Computer Science at the Tufts University School of Engineering. She is the principal investigator for the Advanced Integrated Circuits and Systems Lab at Tufts University. [1]
Koomson was born in Washington, DC and graduated from Benjamin Banneker Academic High School. Her parents, Otis and Vernese Joyner, moved to Washington DC during the Great Migration after living for years as sharecroppers in Wilson County, North Carolina. Her family history can be traced back to the antebellum period. Her oldest known relative is Hagar Atkinson, an enslaved African woman whose name is recorded in the will of a plantation owner in Johnston County, North Carolina. [2]
Koomson attended the Massachusetts Institute of Technology, graduating with a BS in electrical engineering and computer science in 1998 and a Master of Engineering in 1999. [3] she earned her Master of Philosophy from the University of Cambridge in 2000, followed by her PhD in electrical engineering from the same institution in 2003.[ citation needed ]
Koomson was an adjunct professor at Howard University from 2004 to 2005, and during that period was a Senior Research Engineer at the University of Southern California's Information Sciences Institute (USC/ISI). She was a visiting professor at Rensselaer Polytechnic Institute and Boston University in 2008 and 2013, respectively. Koomson joined Tufts University in 2005 as an assistant professor and became an associate professor in 2011. In 2020, Koomson was named an MLK Visiting Professor at MIT for the academic year 2020/2021. [4]
Her Advanced Integrated Circuits and Systems Lab continues to do research into the design and implementation of innovative high-performance, low-power microsystems, with a focus on the integration of heterogeneous devices/materials (optical, RF, bio/chemical) with silicon circuit architectures to address challenges in high-speed wireless communication, biomedical imaging, and sensing. [5] Recently, Koomson has focused on addressing racial bias in medical devices and algorithms, including the pulse oximeter device that became widely used by the public during the Covid-19 Pandemic. [6] [7] [8] [9] [10] [11] She's been addressing this concern through the development of technology designed to measure a person's skin tone. This innovation will allow the pulse oximeter to emit more light into the device, ensuring individuals with higher melanin levels receive a more accurate reading. Koomson has also been actively engaged with policymakers and scientists, advocating for an FDA review of the biases linked to pulse oximeters. [12] This effort played a pivotal role in orchestrating an FDA forum which gathered in late 2022 to address the issue. She shared with The Tufts Admission Magazine, "I spent one summer contacting our congressional delegation in Massachusetts to ensure lawmakers are aware of these issues and talking to their staff members who focus on health policy. Senator Warren led the charge in 2021 to urge the Food and Drug Administration (FDA) to review this." [13] In addition to her work with medical devices, Koomson played a crucial role in a collaborative team focused on developing a Hybrid VLC/RF parking automation system. [14] [15] [16] [17] [18] [ better source needed ][ better source needed ]
Digital electronics is a field of electronics involving the study of digital signals and the engineering of devices that use or produce them. This is in contrast to analog electronics which work primarily with analog signals. Despite the name, digital electronics designs includes important analog design considerations.
Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around 20 kHz to around 300 GHz. This is roughly between the upper limit of audio frequencies and the lower limit of infrared frequencies, and also encompasses the microwave range, though other definitions treat microwaves as a separate band from RF. These are the frequencies at which energy from an oscillating current can radiate off a conductor into space as radio waves, so they are used in radio technology, among other uses. Different sources specify different upper and lower bounds for the frequency range.
A silicon controlled rectifier or semiconductor controlled rectifier is a four-layer solid-state current-controlling device. The name "silicon controlled rectifier" is General Electric's trade name for a type of thyristor. The principle of four-layer p–n–p–n switching was developed by Moll, Tanenbaum, Goldey, and Holonyak of Bell Laboratories in 1956. The practical demonstration of silicon controlled switching and detailed theoretical behavior of a device in agreement with the experimental results was presented by Dr Ian M. Mackintosh of Bell Laboratories in January 1958. The SCR was developed by a team of power engineers led by Gordon Hall and commercialized by Frank W. "Bill" Gutzwiller in 1957.
A photoplethysmogram (PPG) is an optically obtained plethysmogram that can be used to detect blood volume changes in the microvascular bed of tissue. A PPG is often obtained by using a pulse oximeter which illuminates the skin and measures changes in light absorption. A conventional pulse oximeter monitors the perfusion of blood to the dermis and subcutaneous tissue of the skin.
Pulse oximetry is a noninvasive method for monitoring blood oxygen saturation. Peripheral oxygen saturation (SpO2) readings are typically within 2% accuracy of the more accurate reading of arterial oxygen saturation (SaO2) from arterial blood gas analysis.
A single-photon avalanche diode (SPAD), also called Geiger-mode avalanche photodiode is a solid-state photodetector within the same family as photodiodes and avalanche photodiodes (APDs), while also being fundamentally linked with basic diode behaviours. As with photodiodes and APDs, a SPAD is based around a semi-conductor p-n junction that can be illuminated with ionizing radiation such as gamma, x-rays, beta and alpha particles along with a wide portion of the electromagnetic spectrum from ultraviolet (UV) through the visible wavelengths and into the infrared (IR).
The School of Engineering is one of the ten schools that comprise Tufts University. The school offers undergraduate and graduate degrees in several engineering disciplines and computer science fields. Along with the School of Arts and Sciences (A&S) and the Fletcher School of Law and Diplomacy, the School of Engineering is located on the university's main campus in Medford and Somerville, Massachusetts. Currently, the engineering school enrolls more than 800 full-time undergraduates and 600 graduate students. The school employs over 100 full-time and part-time faculty members.
Axel Scherer is the Bernard Neches Professor of Electrical Engineering, Physics, and Applied Physics at the California Institute of Technology. He is also a distinguished visiting professor at Thayer School of Engineering at Dartmouth College. He is known for fabricating the world's first semiconducting vertical-cavity surface-emitting laser (VCSEL) at Bell Labs. In 2006, Scherer was named the director of the Kavli Nanoscience Institute. He graduated from the New Mexico Institute of Mining and Technology in 1985. At Caltech, he teaches a very popular freshman lab course on semiconductor device fabrication, Applied Physics 9ab, for which he wrote the textbook for the course.
Masimo Corporation is a health technology and consumer electronics company based in Irvine, California. The company primarily manufactures patient monitoring devices and technologies, including non-invasive sensors using optical technology, patient management, and telehealth platforms. In 2022, the company expanded into home audio by acquiring Sound United, and began to manufacture health-oriented wearable devices.
Asad Ali Abidi is a Pakistani-American electrical engineer. He serves as a tenured professor at University of California, Los Angeles, and is the inaugural holder of the Abdus Salam Chair at the Lahore University of Management Sciences (LUMS). He is best known for pioneering RF CMOS technology during the late 1980s to early 1990s. As of 2008, the radio transceivers in all wireless networking devices and modern mobile phones are mass-produced as RF CMOS devices.
The Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik (FBH) is a research institute, which is a member of the Gottfried Wilhelm Leibniz Scientific Community. The institute is located in Berlin at the Wissenschafts- und Wirtschaftsstandort Adlershof (WISTA), its research activity is applied science in the fields of III-V electronics, photonics, integrated quantum technology and III-V technology
Electronic engineering is a sub-discipline of electrical engineering that emerged in the early 20th century and is distinguished by the additional use of active components such as semiconductor devices to amplify and control electric current flow. Previously electrical engineering only used passive devices such as mechanical switches, resistors, inductors, and capacitors.
An analog front-end is a set of analog signal conditioning circuitry that uses sensitive analog amplifiers, often operational amplifiers, filters, and sometimes application-specific integrated circuits for sensors, radio receivers, and other circuits to provide a configurable and flexible electronics functional block needed to interface a variety of sensors to an antenna, analog-to-digital converter or, in some cases, to a microcontroller.
James G. Fujimoto is Elihu Thomson Professor of Electrical Engineering and Computer Science at the Massachusetts Institute of Technology (MIT) and a visiting professor of ophthalmology at Tufts University School of Medicine, Boston, Massachusetts.
In electronics, power amplifier classes are letter symbols applied to different power amplifier types. The class gives a broad indication of an amplifier's characteristics and performance. The first three classes are related to the time period that the active amplifier device is passing current, expressed as a fraction of the period of a signal waveform applied to the input. This metric is known as conduction angle (θ). A class A amplifier is conducting through all the period of the signal (θ=360°); Class B only for one-half the input period (θ=180°), class C for much less than half the input period (θ<180°). Class D amplifiers operate their output device in a switching manner; the fraction of the time that the device is conducting may be adjusted so a pulse-width modulation output can be obtained from the stage.
Bioinstrumentation or Biomedical Instrumentation is an application of biomedical engineering which focuses on development of devices and mechanics used to measure, evaluate, and treat biological systems. The goal of biomedical instrumentation focuses on the use of multiple sensors to monitor physiological characteristics of a human or animal for diagnostic and disease treatment purposes. Such instrumentation originated as a necessity to constantly monitor vital signs of Astronauts during NASA's Mercury, Gemini, and Apollo missions.
RF CMOS is a metal–oxide–semiconductor (MOS) integrated circuit (IC) technology that integrates radio-frequency (RF), analog and digital electronics on a mixed-signal CMOS RF circuit chip. It is widely used in modern wireless telecommunications, such as cellular networks, Bluetooth, Wi-Fi, GPS receivers, broadcasting, vehicular communication systems, and the radio transceivers in all modern mobile phones and wireless networking devices. RF CMOS technology was pioneered by Pakistani engineer Asad Ali Abidi at UCLA during the late 1980s to early 1990s, and helped bring about the wireless revolution with the introduction of digital signal processing in wireless communications. The development and design of RF CMOS devices was enabled by van der Ziel's FET RF noise model, which was published in the early 1960s and remained largely forgotten until the 1990s.
Mohamad Sawan is a Canadian-Lebanese electrical engineer, academic and researcher. He is a Chair Professor at Westlake University, China, and an Emeritus Professor of Electrical Engineering at Polytechnique Montréal, Canada.
Kimani Christopher Toussaint, Jr. is an American engineer who is a professor and senior associate dean in the School of Engineering at Brown University. His research considers the development of quantitative nonlinear optical imaging methods and advanced optical techniques for nanotechnology, and the characterization of plasmonic nanostructure. He is a Fellow of Optica.