Aurelia Butler

If you’ve ever swatted a mosquito away from your face, only to have it return again (and again and again), you know that insects can be remarkably acrobatic and resilient in flight. Those traits help them navigate the aerial world, with all of its wind gusts, obstacles, and general uncertainty. Such traits are also hard to build into flying robots, but MIT Assistant Professor Kevin Yufeng Chen has built a system that approaches insects’ agility.
Chen, a member of the Department of Electrical Engineering and Computer Science and the Research Laboratory of Electronics, has developed insect-sized drones with unprecedented dexterity and resilience. The aerial robots are powered by a new class of soft actuator, which allows them to withstand the physical travails of real-world flight. Chen hopes the robots could one day aid humans by pollinating crops or performing machinery inspections in cramped spaces.
Chen’s work appears this month in the journal IEEE Transactions on Robotics. His co-authors include MIT PhD student Zhijian Ren, Harvard University PhD student Siyi Xu, and City University of Hong Kong roboticist Pakpong Chirarattananon.
Typically, drones require wide open spaces because they’re neither nimble enough to navigate confined spaces nor robust enough to withstand collisions in a crowd. “If we look at most drones today, they’re usually quite big,” says Chen. “Most of their applications involve flying outdoors. The question is: Can you create insect-scale robots that can move around in very complex, cluttered spaces?”
According to Chen, “The challenge of building small aerial robots is immense.” Pint-sized drones require a fundamentally different construction from larger ones. Large drones are usually powered by motors, but motors lose efficiency as you shrink them. So, Chen says, for insect-like robots “you need to look for alternatives.”
The principal alternative until now has been employing a small, rigid actuator built from piezoelectric ceramic materials. While piezoelectric ceramics allowed the first generation of tiny robots to take flight, they’re quite fragile. And that’s a problem when you’re building a robot to mimic an insect — foraging bumblebees endure a collision about once every second.
Chen designed a more resilient tiny drone using soft actuators instead of hard, fragile ones. The soft actuators are made of thin rubber cylinders coated in carbon nanotubes. When voltage is applied to the carbon nanotubes, they produce an electrostatic force that squeezes and elongates the rubber cylinder. Repeated elongation and contraction causes the drone’s wings to beat — fast.
Chen’s actuators can flap nearly 500 times per second, giving the drone insect-like resilience. “You can hit it when it’s flying, and it can recover,” says Chen. “It can also do aggressive maneuvers like somersaults in the air.” And it weighs in at just 0.6 grams, approximately the mass of a large bumble bee. The drone looks a bit like a tiny cassette tape with wings, though Chen is working on a new prototype shaped like a dragonfly.
Building insect-like robots can provide a window into the biology and physics of insect flight, a longstanding avenue of inquiry for researchers. Chen’s work addresses these questions through a kind of reverse engineering. “If you want to learn how insects fly, it is very instructive to build a scale robot model,” he says. “You can perturb a few things and see how it affects the kinematics or how the fluid forces change. That will help you understand how those things fly.” But Chen aims to do more than add to entomology textbooks. His drones can also be useful in industry and agriculture.
Chen says his mini-aerialists could navigate complex machinery to ensure safety and functionality. “Think about the inspection of a turbine engine. You’d want a drone to move around [an enclosed space] with a small camera to check for cracks on the turbine plates.”
Other potential applications include artificial pollination of crops or completing search-and-rescue missions following a disaster. “All those things can be very challenging for existing large-scale robots,” says Chen. Sometimes, bigger isn’t better.

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Materials provided by Massachusetts Institute of Technology. Original written by Daniel Ackerman. Note: Content may be edited for style and length. More

When you think about your carbon footprint, what comes to mind? Driving and flying, probably. Perhaps home energy consumption or those daily Amazon deliveries. But what about watching Netflix or having Zoom meetings? Ever thought about the carbon footprint of the silicon chips inside your phone, smartwatch or the countless other devices inside your home?
Every aspect of modern computing, from the smallest chip to the largest data center comes with a carbon price tag. For the better part of a century, the tech industry and the field of computation as a whole have focused on building smaller, faster, more powerful devices — but few have considered their overall environmental impact.
Researchers at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) are trying to change that.
“Over the next decade, the demand, number and types of devices is only going to grow,” said Udit Gupta, a PhD candidate in Computer Science at SEAS. “We want to know what impact that will have on the environment and how we, as a field, should be thinking about how we adopt more sustainable practices.”
Gupta, along with Gu-Yeon Wei, the Robert and Suzanne Case Professor of Electrical Engineering and Computer Science, and David Brooks, the Haley Family Professor of Computer Science, will present a paper on the environmental footprint of computing at the IEEE International Symposium on High-Performance Computer Architecture on March 3rd, 2021.
The SEAS research is part of a collaboration with Facebook, where Gupta is an intern, and Arizona State University.

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The team not only explored every aspect of computing, from chip architecture to data center design, but also mapped the entire lifetime of a device, from manufacturing to recycling, to identify the stages where the most emissions occur.
The team found that most emissions related to modern mobile and data-center equipment come from hardware manufacturing and infrastructure.
“A lot of the focus has been on how we reduce the amount of energy used by computers, but we found that it’s also really important to think about the emissions from just building these processors,” said Brooks. “If manufacturing is really important to emissions, can we design better processors? Can we reduce the complexity of our devices so that manufacturing emissions are lower?”
Take chip design, for example.
Today’s chips are optimized for size, performance and battery life. The typical chip is about 100 square millimeters of silicon and houses billions of transistors. But at any given time, only a portion of that silicon is being used. In fact, if all the transistors were fired up at the same time, the device would exhaust its battery life and overheat. This so-called dark silicon improves a device’s performance and battery life but it’s wildly inefficient if you consider the carbon footprint that goes into manufacturing the chip.

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“You have to ask yourself, what is the carbon impact of that added performance,” said Wei. “Dark silicon offers a boost in energy efficiency but what’s the cost in terms of manufacturing? Is there a way to design a smaller and smarter chip that uses all of the silicon available? That is a really intricate, interesting, and exciting problem.”
The same issues face data centers. Today, data centers, some of which span many millions of square feet, account for 1 percent of global energy consumption, a number that is expected to grow.
As cloud computing continues to grow, decisions about where to run applications — on a device or in a data center — are being made based on performance and battery life, not carbon footprint.
“We need to be asking what’s greener, running applications on the device or in a data center,” said Gupta. “These decisions must optimize for global carbon emissions by taking into account application characteristics, efficiency of each hardware device, and varying power grids over the day.”
The researchers are also challenging industry to look at the chemicals used in manufacturing.
Adding environmental impact to the parameters of computational design requires a massive cultural shift in every level of the field, from undergraduate CS students to CEOs.
To that end, Brooks has partnered with Embedded EthiCS, a Harvard program that embeds philosophers directly into computer science courses to teach students how to think through the ethical and social implications of their work. Brooks is including an Embedded EthiCS module on computational sustainability in COMPSCI 146: Computer Architecture this spring.
The researchers also hope to partner with faculty from Environmental Science and Engineering at SEAS and the Harvard University Center for the Environment to explore how to enact change at the policy level.
“The goal of this paper is to raise awareness of the carbon footprint associated with computing and to challenge the field to add carbon footprint to the list of metrics we consider when designing new processes, new computing systems, new hardware, and new ways to use devices. We need this to be a primary objective in the development of computing overall,” said Wei.
The paper was co-authored by Sylvia Lee, Jordan Tse, Hsien-Hsin S. Lee and Carole-Jean Wu from Facebook and Young Geun Kim from Arizona State University. More

When quantum computers become more powerful and widespread, they will need a robust quantum internet to communicate.
Purdue University engineers have addressed an issue barring the development of quantum networks that are big enough to reliably support more than a handful of users.
The method, demonstrated in a paper published in Optica, could help lay the groundwork for when a large number of quantum computers, quantum sensors and other quantum technology are ready to go online and communicate with each other.
The team deployed a programmable switch to adjust how much data goes to each user by selecting and redirecting wavelengths of light carrying the different data channels, making it possible to increase the number of users without adding to photon loss as the network gets bigger.
If photons are lost, quantum information is lost — a problem that tends to happen the farther photons have to travel through fiber optic networks.
“We show a way to do wavelength routing with just one piece of equipment — a wavelength-selective switch — to, in principle, build a network of 12 to 20 users, maybe even more,” said Andrew Weiner, Purdue’s Scifres Family Distinguished Professor of Electrical and Computer Engineering. “Previous approaches have required physically interchanging dozens of fixed optical filters tuned to individual wavelengths, which made the ability to adjust connections between users not practically viable and photon loss more likely.”
Instead of needing to add these filters each time that a new user joins the network, engineers could just program the wavelength-selective switch to direct data-carrying wavelengths over to each new user — reducing operational and maintenance costs as well as making a quantum internet more efficient.

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The wavelength-selective switch also can be programmed to adjust bandwidth according to a user’s needs, which has not been possible with fixed optical filters. Some users may be using applications that require more bandwidth than others, similarly to how watching shows through a web-based streaming service uses more bandwidth than sending an email.
For a quantum internet, forming connections between users and adjusting bandwidth means distributing entanglement, the ability of photons to maintain a fixed quantum mechanical relationship with one another no matter how far apart they may be to connect users in a network. Entanglement plays a key role in quantum computing and quantum information processing.
“When people talk about a quantum internet, it’s this idea of generating entanglement remotely between two different stations, such as between quantum computers,” said Navin Lingaraju, a Purdue Ph.D. student in electrical and computer engineering. “Our method changes the rate at which entangled photons are shared between different users. These entangled photons might be used as a resource to entangle quantum computers or quantum sensors at the two different stations.”
Purdue researchers performed the study in collaboration with Joseph Lukens, a research scientist at Oak Ridge National Laboratory. The wavelength-selective switch that the team deployed is based on similar technology used for adjusting bandwidth for today’s classical communication.
The switch also is capable of using a “flex grid,” like classical lightwave communications now uses, to partition bandwidth to users at a variety of wavelengths and locations rather than being restricted to a series of fixed wavelengths, each of which would have a fixed bandwidth or information carrying capacity at fixed locations.
“For the first time, we are trying to take something sort of inspired by these classical communications concepts using comparable equipment to point out the potential advantages it has for quantum networks,” Weiner said.
The team is working on building larger networks using the wavelength-selective switch. The work was funded by the U.S. Department of Energy, the National Science Foundation and Oak Ridge National Laboratory.

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Materials provided by Purdue University. Original written by Kayla Wiles. Note: Content may be edited for style and length. More

The coronavirus pandemic has drawn new attention to the digital divide, as the need for online schooling and working from home has disproportionately hurt those without computer equipment and skills.
Research by Paul A. Pavlou, dean of the C. T. Bauer College of Business at the University of Houston, found that people with basic Information Technology (IT) skills — including the ability to use email, copy and paste files and work with an Excel spreadsheet — are more likely to be employed, even in jobs that aren’t explicitly tied to those skills.
People with more advanced IT skills generally earned higher salaries, the researchers found. The work is described in Information Systems Research.
“Unemployment and low wages remain pressing societal challenges in the wake of increased automation, more so for traditionally-disadvantaged groups in the labor market, such as women, minorities, and the elderly,” the researchers wrote. “However, workers who possess relevant IT skills might have an edge in an increasingly digital economy.”
The findings, Pavlou said, reinforce the need for robust public policy to ensure people, especially women, older workers and others who are more likely to face employment discrimination, have the basic IT skills needed for the modern working world, since few companies provide on-the-job training in those skills.
“Very few people can get these skills from their employer. Workers are expected to obtain these IT skills themselves, in order to get a job in the first place” he said. “And the less-privileged population they are, the harder time they have obtaining these skills that require computer equipment and internet access.”
That leaves many workers, especially from under-represented populations in the labor market, unable to even apply for work, as more job applications — and now, interviews — are handled online.
In addition to Pavlou, co-authors on the paper include Hilal Atasoy of Rutgers University and Rajiv Banker from Temple University.
The analysis was conducted using two datasets from the Turkish Statistical Institute, and Pavlou said the findings are especially relevant for the developing world, where people are less likely to have IT skills and access to computer equipment than they are in the United States.
But the pandemic has laid bare unequal access to technology in the United States, too, as schools and universities struggle to provide students with computers, internet hotspots and other equipment to continue their educations online.
The work thus has implications for marginalized workers in the United States and other developed countries, Pavlou said. That includes women and older workers, who are more likely to opt out of the labor force if they cannot work from home — jobs that are more likely to require at least basic tech savvy.
“The digital divide is a major societal problem,” Pavlou said. “I think the pandemic will make it even more pronounced. People with basic IT skills will have access to more opportunities, and it is imperative for educational institutions to provide these IT skills, especially in traditionally-disadvantaged populations.”

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Materials provided by University of Houston. Note: Content may be edited for style and length. More

A recent study of how human resources professionals review online information and social media profiles of job candidates highlights the ways in which so-called “cybervetting” can introduce bias and moral judgment into the hiring process.
“The study drives home that cybervetting is ultimately assessing each job candidate’s moral character,” says Steve McDonald, corresponding author of the study and a professor of sociology at North Carolina State University. “It is equally clear that many of the things hiring professionals are looking at make it more likely for bias to play a role in hiring.”
For this study, the researchers conducted in-depth interviews with 61 human resources professionals involved in recruitment and hiring across many industries. Study participants ranged from in-house HR staff to executive recruitment consultants to professionals at staffing agencies.
“One of the things that cropped up repeatedly was that cybervetting not only judges people’s behavior, but how that behavior is presented,” says Amanda Damarin, co-author of the paper and an associate professor of sociology at Georgia State University. “For example, one participant noted that his organization had no problem with employees drinking alcohol, but did not want to see any photos of alcohol in an employee’s social media feed.
“There’s a big disconnect here. One the one hand, HR professionals view social media as being an ‘authentic’ version of who people really are; but those same HR professionals are also demanding that people carefully curate how they present themselves on social media.”
“It was also clear that people were rarely looking for information related to job tasks — a point some study participants brought up themselves,” McDonald says. “And the things they did look for reflected their explicit or implicit biases.”
For example, study participants referenced looking for things like posts about hiking and family photos of Christmas. But most people who hike are white, and most people who post Christmas photos are Christians. Study participants also expressed a preference for online profiles that signaled “active” and “energetic” lifestyles, which could lead to discrimination against older or disabled job seekers.
And it was often unclear what job candidates could do to address concerns about bias in cybervetting. For example, while many study participants noted that putting a photo online created the opportunity for bias to affect the hiring process, other study participants noted that not having a “professional” profile picture was in itself a “red flag.”
“Some workers have a social media profile that sends the right signals and can take advantage of cybervetting,” McDonald says. “But for everyone else, they are not only at a disadvantage, but they don’t even know they are at a disadvantage — much less why they are at a disadvantage. Because they don’t necessarily know what employers are looking for.”
“Some of the people we interviewed were very aware that cybervetting could lead to increased bias; some even avoided cybervetting for that reason,” Damarin says. “But others were enthusiastic about its use.”
Researchers say one of the key takeaways from the work is that there need to be clear guidelines or best practices for the use of cybervetting, if it is going to be used at all.
“The second takeaway is that the biases and moral judgments we are hearing about from these HR professionals are almost certainly being incorporated into software programs designed to automate the review of job candidates,” McDonald says. “These prejudices will simply be baked into the algorithms, making them a long-term problem for both organizations and job seekers.”

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Materials provided by North Carolina State University. Original written by Matt Shipman. Note: Content may be edited for style and length. More

Travellers looking to book a hotel should trust their gut instinct when it comes to online reviews rather than relying on computer algorithms to weed out the fake ones, a new study suggests.
Research, led by the University of York in collaboration with Nanyang Technological University, Singapore, shows the challenges of online ‘fake’ reviews for both users and computer algorithms. It suggests that a greater awareness of the linguistic characteristics of ‘fake’ reviews can allow online users to spot the ‘real’ from the ‘fake’ for themselves.
Dr Snehasish Banerjee, Lecturer in Marketing from the University of York’s Management School, said: “Reading and writing online reviews of hotels, restaurants, venues and so on, is a popular activity for online users, but alongside this, ‘fake’ reviews have also increased.
“Companies can now use computer algorithms to distinguish the ‘fake’ from the ‘real’ with a good level of accuracy, but the extent to which company websites use these algorithms is unclear and so some ‘fake’ reviews slip through the net.
“We wanted to understand whether human analysis was capable of filling this gap and whether more could be done to educate online users on how to approach these reviews.”
The researchers tasked 380 people to respond to questions about three hotel reviews — some authentic, others fake — based on their perception of the reviews. The users could rely on the same cues that computer algorithm use to discern ‘fake’ reviews, which includes the number of superlatives in the review, the level of details, if it was easy to read, and appeared noncommittal.
For those who already sceptical of online reviews this was a relatively straightforward task, but most could not identity factors such as ‘easy to read’ and ‘non-committal’ like a computer algorithm could. In the absence of this skill, the participants relied on ‘gut instinct’.
Dr Banerjee said: “The outcomes were surprisingly effective. We often assume that the human brain is no match for a computer, but in actual fact there are certain things we can do to train the mind in approaching some aspects of life differently.
“Following this study, we are recommending that people need to curb their instincts on truth and deception bias — the tendency to either approach online content with the assumption that it is all true or all fake respectively — as neither method works in the online environment.
“Online users often fail to detect fake reviews because they do not proactively look for deception cues. There is a need to change this default review reading habit, and if reading habit is practised long enough, they will eventually be able to rely on their gut instinct for fake review detection.”
The research also reminds businesses that ethical standards should be upheld to ensure that genuine experiences of their services are reflected online.

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Materials provided by University of York. Note: Content may be edited for style and length. More

Researchers at Tel Aviv University report that they have successfully connected the ear of a dead locust to a robot that receives the ear’s electrical signals and responds accordingly. The result is extraordinary: When the researchers clap once, the locust’s ear hears the sound and the robot moves forward; when the researchers clap twice, the robot moves backwards.
The interdisciplinary study was led by Idan Fishel, a joint master student under the joint supervision of Dr. Ben M. Maoz of the Iby and Aladar Fleischman Faculty of Engineering and the Sagol School of Neuroscience, Prof. Yossi Yovel and Prof. Amir Ayali, experts from the School of Zoology and the Sagol School of Neuroscience together with Dr. Anton Sheinin, Idan, Yoni Amit, and Neta Shavil. The results of the study were published in the journal Sensors.
The researchers explain that at the beginning of the study, they sought to examine how the advantages of biological systems could be integrated into technological systems, and how the senses of dead locust could be used as sensors for a robot. “We chose the sense of hearing, because it can be easily compared to existing technologies, in contrast to the sense of smell, for example, where the challenge is much greater,” says Dr. Maoz. “Our task was to replace the robot’s electronic microphone with a dead insect’s ear, use the ear’s ability to detect the electrical signals from the environment, in this case vibrations in the air, and, using a special chip, convert the insect input to that of the robot.”
To carry out this unique and unconventional task, the interdisciplinary team (Maoz, Yovel and Ayali) faced number of challenged. In the first stage the researchers built a robot capable of responding to signals it receives from the environment. Then, in a multidisciplinary collaboration, the researchers were able to isolate and characterize the dead locust ear and keep it alive, that is, functional, long enough to successfully connect it to the robot. In the final stage, the researchers succeeded in finding a way to pick up the signals received by the locust’s ear in a way that could be used by the robot. At the end of the process, the robot was able to “hear” the sounds and respond accordingly.
“Prof. Ayali’s laboratory has extensive experience working with locusts, and they have developed the skills to isolate and characterize the ear,” explains Dr. Maoz. “Prof. Yovel’s laboratory built the robot and developed code that enables the robot to respond to electrical auditory signals. And my laboratory has developed a special device — Ear-on-a-Chip — that allows the ear to be kept alive throughout the experiment by supplying oxygen and food to the organ, while allowing the electrical signals to be taken out of the locust’s ear and amplified and transmitted to the robot.
“In general, biological systems have a huge advantage over technological systems — both in terms of sensitivity and in terms of energy consumption. This initiative of Tel Aviv University researchers opens the door to sensory integrations between robots and insects — and may make much more cumbersome and expensive developments in the field of robotics redundant.
“It should be understood that biological systems expend negligible energy compared to electronic systems. They are miniature, and therefore also extremely economical and efficient. For the sake of comparison, a laptop consumes about 100 watts per hour, while the human brain consumes about 20 watts a day. Nature is much more advanced than we are, so we should use it. The principle we have demonstrated can be used and applied to other senses, such as smell, sight and touch. For example, some animals have amazing abilities to detect explosives or drugs; the creation of a robot with a biological nose could help us preserve human life and identify criminals in a way that is not possible today. Some animals know how to detect diseases. Others can sense earthquakes. The sky is the limit.”

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Materials provided by Tel Aviv University. Note: Content may be edited for style and length. More

In the group of Prof. Karl Leo, physicists, material scientists and engineers are working jointly on the development of novel organic materials and devices for high performance, flexible and possibly even biocompatible electronics and optoelectronics of the future. Increasing the performance of organic devices is one of the key challenges in their research. It was only last year, when the team headed by Dr. Hans Kleemann announced an important breakthrough with the development of efficient, printable vertical organic transistors.
Now Dr. Zhongbin Wu, Dr. Yuan Liu, and PhD student Erjuan Guo present the first electronic device that combines a vertical organic permeable base transistor (OPBT) and an OLED. With this novel device concept of an organic permeable base light-emitting transistor (OPB-LET), the researchers succeeded in combining the function of a highly efficient switching transistor and an organic light-emitting diode as commonly employed in active matrix displays. Active matrix liquid crystal displays (AMLCD) usually contain a matrix of thin-film transistors to drive LCD pixels. Each individual pixel has a circuit with active components (mostly transistors). In this context, organic light-emitting transistors, three-terminal devices combining a thin-film transistor with a light-emitting diode, have generated increasing interest. However, increasing their efficiency while keeping the operating voltage low remains a key challenge.
“The key to construct the high performance OPB-LETs is the permeable base electrode located at the center of the device, forming a distinctive optical microcavity and regulating charge carrier injection and transport. The thus designed three-terminal vertical optoelectronic devices can simultaneously high efficiencies (up to 24.6%), high luminance (up to 12,513 cd m-2), and low driving voltages ( More