Current computer systems are very good at performing exact calculations. But as we are using more and more AI-based applications, we also need more efficient systems that are able to process data in real time with the same precision. TU/e researcher Eveline van Doremaele is working on a new generation of computers modeled after the human brain. What’s more, she used organic materials for the unique chip she developed with neuromorphic computing, which means it is able to interact with our bodies.

Self-driving cars, facial recognition, language recognition: all applications based on artificial intelligence. To make these possible, computer systems need to adapt to an increasingly dynamic environment and be able to handle unstructured and imperfect data. Current artificial neural networks work well, but also have significant disadvantages. For instance, they use a lot of energy and take a relatively long time to perform complex calculations.

This is why TU/e researcher Eveline van Doremaele spent the last few years working on a new generation of computer systems, developing a smart chip that can be used for a variety of applications in the human body. On Thursday, May 25, she defended her thesis cum laude at the Mechanical Engineering department.

Mimicking the brain

“We ourselves carry around a perfect system for performing complex tasks,” Van Doremaele says while briefly touching her head. “Our brain is very good at dealing with uncertainties and works very efficiently in changing circumstances. This is mainly owing to the brain’s ability to execute processes and calculations at the same time, as well as learn based on previous experiences. That’s exactly what we need for AI applications.”

It’s no wonder neuromorphic computing—mimicking the structure and function of our brain in a computer system—has been on the rise in recent years, says Van Doremaele. “Energy-efficient, fast and dynamic, our brain demonstrates how a perfect computer system should function, thereby serving as a huge source of inspiration to our group and other scientists. We take it to the next level by trying to develop a device centering on the self-learning interaction between people and machines.”

“Examples include a smart prosthetic arm that you can hook up to your body and that you can teach to grab a pen thanks to artificial neurons, a chip that uses different sensors at the same time to detect a circulating cancer cell between millions of normal cells, and a pacemaker that can adapt to an aging heart. Once we have the technology up and running, the applications are infinite.”

Self-learning system

To make such a chip, Van Doremaele set out in search of suitable materials that both lend themselves to programming and are well-received by our bodies. Van Doremaele’s research shows that conductive organic polymers, long molecules that allow electric current to pass through, are very effective in this respect.

“To enable the system to self-learn, it’s essential for the resistance in the device to be variable. This also happens in our brain: as you learn something more often, the connection between the neural cells grows stronger. Using ions actually allows us to vary the resistance, but we also want to make the connection permanent,” she explains.

Weaker connections

“Until now, the usage of materials in which the connections grow weaker over time has been common to our field,” the Ph.D. candidate continues. “In the case of a prosthetic arm, this would mean that after a month you would, for example, no longer know how to pick up a pen.”

“P-3O, the ambipolar material we tested, is unique: it is able to vary the resistance and retain the connection created. It also works both with a liquid electrolyte, such as in a watery environment within the body, and with a solid electrolyte, an ion gel. By linking cells to each other, we can make complex circuits with certain characteristics. This comes in handy when measuring weak signals, such as minute muscle movements, or signals that are surrounded by a lot of noise, such as a heartbeat.”

Measuring sweat samples

Even though a lot of further research is necessary to perform complex measurements, Van Doremaele did already use neuromorphic computing to develop a biosensor that could analyze test subjects’ sweat samples for the presence of the hereditary disease cystic fibrosis. “Using different sensors, the chip can measure the potassium and chlorine content of the sweat. We had the system make predictions for every sweat sample. If the prediction was wrong, I pressed a button and the system corrected itself. In the end, the biosensor only gave correct answers. So it learned in a unique way, like a neuron in the human brain. This provides us with a basis we can elaborate on.”

Van Doremaele has noticed a lot of interest in her work. “AI is virtually everywhere and it’s only going to get more omnipresent. But the energy problem is also increasing, as data centers use enormous amounts of energy. This means it’s essential we find alternative computer systems. Our focus on organic materials for self-learning biomedical applications is pretty unique.”

“There are only a handful of groups working on this, often in joint projects. Given the project’s multidisciplinary nature, we also established connections on campus. By looking for colleagues with different backgrounds and by sharing a lot of knowledge, I became the linking pin between the TU/e research institutes EAISI (Artificial Intelligence) and ICMS (Complex Molecular Systems). A Ph.D. can be lonely sometimes, but I have a colossal acknowledgement in my dissertation to show for it.”

UK airports were chaotic on Saturday after glitches in the passport e-gate system held up people arriving in the country for hours.

It comes at a busy weekend with a bank holiday on Monday overlapping with a school holiday.

Travelers said on social media they waited hours as those eligible to use the e-gates had to have their passports checked by immigration officials instead.

A woman who landed at Heathrow early Saturday wrote: “Returning from Dubai overnight to this mother of queues.

“My plane landed at 6 am, there is still a sea of people in front of me, passport checks are being done manually.”

London’s two main airports—Heathrow and Gatwick—were among those affected.

Heathrow said it was “working closely with Border Force”, which operates the e-gates, “to help resolve the problem as quickly as possible” and has deployed additional staff.

The Home Office said the Border Force had “robust plans in place” to send its officers to help reduce wait times.

There are over 270 e-gates at 15 air and rail ports in the UK, according to the government, available to British nationals, EU citizens over the age of 12 as well as passport holders of several other countries, such as Australia and Canada.

On Saturday evening, the Home Office said the issue was resolved.

“Following a technical border system fault which affected e-gate arrivals into the UK, we can confirm all e-gates are now operating as normal,” it said.

The delays come after the UK’s British Airways airline canceled dozens of flights through Heathrow airport over the course of Thursday and Friday following a knock-on technical issue.

Long queues also formed at Dover, a major port for ferries to France in the southeast of England, on Saturday due to IT issues at French passport control.

The Port of Dover said on Twitter that the technical issues were resolved and that the average waiting time was down to 30-45 minutes, compared to 90 minutes earlier in the day.

© 2023 AFP

NASA successfully completed a flight test of its super pressure balloon carrying the Super Pressure Balloon Imaging Telescope (SuperBIT) science mission at 9:27 a.m. EDT, Thursday, May 25, after some 39 days and 14 hours of flight.

The mission began at 11:42 a.m., Sunday, April 16 (7:42 p.m. April 15 in U.S. Eastern Time) launching from Wānaka Airport, New Zealand, which is NASA’s long-duration balloon program launch site.

“This flight was, bar none, our best to date with the balloon flying nominally in the stratosphere and maintaining a stable float altitude,” said Debbie Fairbrother, NASA’s Balloon Program Office chief at the Agency’s Wallops Flight Facility in Virginia. “Achieving long-duration balloon flight through day and night conditions is an important goal for our program and the science community, and this flight has moved the needle significantly in validating and qualifying the balloon technology.”

Having identified a safe landing area over southern Argentina, balloon operators from NASA’s Columbia Scientific Balloon Facility in Palestine, Texas, sent flight termination commands at 8:37 a.m. EDT, May 25. The 18.8-million-cubic-foot (532,000-cubic-meter) balloon then separated from the payload rapidly deflating, and the payload floated safely to the ground on a parachute touching down in an unpopulated area 66 nautical miles (122 kilometers) northeast of Gobernador Gregores, Argentina.

NASA coordinated with Argentine officials prior to ending the balloon mission; recovery of the payload and balloon is in progress.

During its nearly 40-day journey, the balloon completed a record five full circuits about the Southern Hemisphere’s mid-latitudes, maintaining a float altitude around 108,000 feet. In the coming days, the predicted flight path would have taken the balloon more southerly with little exposure to sunlight, creating some risk in maintaining power to the balloon’s systems, which are charged via solar panels. The land-crossing created an opportunity to safely conclude the flight and recover the balloon and payload.

“I could not be prouder of the team for conducting a safe and successful flight, and the science returns from SuperBIT have been nothing short of amazing,” said Fairbrother.

Next up for NASA’s Balloon Program is a science mission launching from the Agency’s Columbia Scientific Balloon Facility in July.

Companies which are seeking to capture value from their digital innovations can do so by constantly releasing improved versions of their current products. But there is a ‘dark side’ to this sort of strategy: the upgrading of products may alienate customers who have already invested a great deal of time and effort in getting used to a particular operating system.

A 2021 study by a Singapore Management University (SMU) professor and his co-researchers, titled “Growing Pains: The effect of generational product innovation on mobile games performance,” has implications for our understanding of digital transformation in general, as digitizing production processes and business models inevitably involve upgrades and iterations.

Digital transformation brings benefits as iterating software is much less costly and faster than upgrading hardware (for example, a car’s operating system as opposed to the car itself), but it also shows that the iteration process may have a downside.

The study, by SMU Associate Professor of Strategy and Entrepreneurship Chen Liang and his co-researchers, found evidence of a dark side, which can be particularly damaging for firms which initiate numerous changes. This negative effect, though, does not tend to be so damaging for market leaders.

The paper argues that while product upgrades—referred to as “generational product innovation” (GPI) in the article—are released with the intention of capturing value, “they may also impose learning costs upon customers which can be value destroying.”

Citing previous studies, their paper points out that “scant attention has been paid to the changes that innovations may impose on customers and the fact that customers may have natural resistance to such changes.”

Although product upgrades are deployed within a wide range of industries, the study focuses on mobile app games in particular, in part due to access to data from 58 countries held by an analyst firm in the mobile intelligence sector.

The paper states that for developers of these apps, “generational innovation is a ubiquitous and important tool in firms’ arsenal.”

“Iteration is something app developers talk a lot about, but not something—at least in our field, in strategic management—people really pick up on,” Professor Chen told the Office of Research. “Whenever we spoke with practitioners, they always felt iteration is what they do every day. They try to keep improving their products based on users’ feedback and new tech trends in the market.”

The researchers conducted interviews with several app developers, with one describing upgrading as “a question of life and death for a mobile game, because users would get bored playing the same game within a month. The best way to survive is to update new content regularly.” Another developer stated that major updates “have the highest potential to generate revenues.”

Professor Chen told the Office of Research that “innovators want to make sure, whenever they launch a new innovation or new product, they get to make money out of it.” While that usually involves intellectual property and copyright protection, software development has some unique challenges due to the speed of innovation in the sector.

“It’s pretty hard to patent a piece of software,” Professor Chen said, adding that as many software companies are small-scale studios, they lack the resources of large manufacturing firms and are unable to hire lawyers specializing in intellectual property. In any case, the industry changes so rapidly that “by the time you get granted a patent, it will be some two years down the road” and, by then, the software or app may have already lost its appeal.

“One main mechanism for value appropriation is simply to iterate faster than your competitors, so you’re always ahead of the game and able to make some money out of it, even if just for a short window of opportunity. But there is a potential cost we need to be aware of.” For instance, the article quotes a Snapchat spokesperson, who told CNN that a major product upgrade “can take a little getting used to”.

“The issue is that whenever you introduce new features and functions to make it more fun for the gamers, you actually make some of their competencies and skills irrelevant at the same time,” Professor Chen said. “So, they need to re-educate themselves and re-establish a set of routines to outcompete other gamers. And that’s the sort of cost we’re getting at.”

The study’s methodology employs a difference-in-differences (DID) approach. “So, essentially, we’re comparing twins, by looking at two very similar products. One app gets a major upgrade, the other—which is very similar in every other respect—doesn’t. And then we compare the performance.”

“After speaking with practitioners—and based on our understanding of digital innovation, it’s likely that apps which have performed badly are more likely to be upgraded because developers want to revive the app. So, if true, you should find some kind of correlation between getting upgraded and the performance.”

The researchers in effect compared the performance of almost identical apps, although the upgraded version may have been released first on a different platform to the previous version. “This is quite similar to medical studies in which they compare twins. The assumption here is that twins are pretty similar in many ways. Genetically, in the way they look, their upbringing and so forth. And one of the twins gets some kind of treatment, whereas the other one is in a control group. Then they compare the outcome to assess the effect of that treatment.”

“So, for us, it’s the same. We look at the same app on Android versus iOS. Two different marketplaces, but the same app. And the good thing is that the timing of a major upgrade isn’t always the same for exogenous reasons. Sometimes approval time in iOS takes longer than for Android, sometimes it’s the other way round and it’s pretty random. So, we take advantage of the variation, which is beyond the control of the app developers themselves.”

“We only look at the performance of the app that receives the major upgrade and compare that with the same app on the other platform. And for the one that was upgraded, you’d expect some kind of change, whereas the app that didn’t get upgraded, its performance wouldn’t change a lot as nothing had happened to it.”

Based on the study then, what would be his advice to software firms producing these apps?

“There’s clearly a long-term benefit to generational innovation for companies,” Professor Chen says, “but from the users’ point of view, at least in the beginning, they probably would become overwhelmed by short-term costs or adjustments. They need to tolerate these and not become overwhelmed, otherwise they’ll probably ditch the app before realizing any long-term benefit.”

“So, the issue here is that it creates a window of opportunity for competitors to take advantage of. Whenever you release a major upgrade, that will hurt your performance in the short term until users feel the benefits outweigh the costs.”

“Products have lifecycles, as does generational innovation. So, the issue here is that it’s a bit like the innovator’s curse. The more you innovate, the more likely it is you’ll get exposed to risks. And your competitors might be able to take advantage of this and gain more users from you by releasing promotions, just as your users are experiencing disruption.”

That said, however, there may be some moderating effects when it comes to games developed by market leaders. “Users still experience a decline in performance but they’re probably more tolerant. They want to stay in the game because it’s popular.”

Professor Chen says that, following the publication of the paper in the Strategic Management Journal, he and his co-researchers are examining the interaction of upstream suppliers of chips, cameras and so on, with downstream software developers.

It’s among the world’s busiest container shipping routes—a stream of vessels packed with furniture, automobiles, clothing and other goods, traversing the Pacific between Los Angeles and Shanghai.

If plans succeed, this corridor will become a showcase for slashing planet-warming carbon emissions from the shipping industry, which produces nearly 3% of the world’s total. That’s less than from cars, trucks, rail or aviation but still a lot—and it’s rising.

The International Maritime Organization, which regulates commercial shipping, wants to halve its greenhouse gas releases by midcentury and may seek deeper cuts this year. “Shipping must embrace decarbonization,” IMO Secretary-General Kitack Lim said in February.

Meeting agency targets will require significant vessel and infrastructure changes. That’s inspiring plans for “green shipping corridors” along major routes where new technologies and methods could be fast-tracked and scaled up.

More than 20 of these partnerships have been proposed. They’re largely on paper now but are expected to take shape in coming years. The goal: uniting marine fuel producers, vessel owners and operators, cargo owners and ports in a common effort.

Front-runners

Los Angeles and Shanghai formed their partnership last year.

“The vision is that a container will leave a factory on a zero-emissions truck (in China),” said Gene Seroka, executive director of the Port of Los Angeles.

“It will arrive at the port of Shanghai, be loaded onto a ship by a zero-emissions cargo handling equipment unit, and move across the Pacific Ocean on a vessel that emits zero carbon. Once it gets to Los Angeles, the reverse happens,” with carbon-free handling and distribution.

Los Angeles entered a second agreement in April with nearby Long Beach and Singapore. Others in the works include the Great Lakes-St. Lawrence River; a Chilean network; and numerous corridors in Asia, North America and Europe.

C40 Cities, a global climate action coalition of mayors, advocates green corridors as “tools that can turn ambition into action, bringing together the entire shipping value chain,” said Alisa Kreynes, a deputy director.

But Kreynes sounded a note of caution: “I can’t help but wonder how much of it is PR and how much of it is actually going to become practice. It’s going to require a cultural shift in thinking about how we get things from point A to point B.”

New approaches developed in green corridors could bring fast results, said John Bradshaw, technical director for environment and safety with the World Shipping Council. “I’m very confident that the industry will deliver zero emissions by 2050.”

Pressure builds

From tea to tennis shoes, stuff in your pantry and closets likely spent time on a ship.

Roughly 90% of traded goods move on water, some in behemoths longer than four football fields, each holding thousands of containers with consumer products. About 58,000 commercial ships ply the seas.

Their emissions are less noticeable than onshore haulers such as trucks, although noxious fumes from ships draw complaints in port communities.

Maritime trade volumes are expected to triple by 2050, according to the Organization for Economic Cooperation and Development. Studies predict the industry’s share of greenhouse gas emissions could reach 15%.

Yet the 2015 Paris climate accord exempts maritime shipping, partly because vessels do business worldwide, while the agreement covers nation-by-nation goals.

“No one wants to take responsibility,” said Allyson Browne of Pacific Environment, an advocacy group. “A ship may be flagged in China, but who takes ownership of emissions from that ship when it’s transporting goods to the U.S.?”

The IMO responded to mounting pressure with a 2018 plan for a 50% emissions reduction by midcentury from 2008 levels. An update scheduled for July may set more ambitious targets favored by the U.S., Europe and small island nations. Opponents include Brazil, China and India.

The Biden administration wants a zero-emission goal, a State Department official told The Associated Press.

But fewer than half of large shipping companies have pledged to meet international carbon objectives. And there’s no consensus about how to accomplish them.

Proposals range from slowing vessels down to charging them for emissions, as the European Union did last year.

“Global shipping is hard to decarbonize … because of the energy required to cover long distances with heavy cargoes,” said Lee Kindberg, head of environment and sustainability for Maersk North America, part of A.P. Moller-Maersk, which has more than 700 vessels. “It’s a stretch but we consider it doable.”

But how?

Mechanical sails. Batteries. Low- or zero-carbon liquid fuels.

They’re among propulsion methods touted as replacements for “bunker fuel” that powers most commercial ships—thick residue from oil refining. It spews greenhouse gases and pollutants that endanger human health: sulfur dioxide, nitrogen oxide, soot.

Finding alternatives will be a priority for green shipping corridors.

For now, liquid natural gas is the runaway choice. Worldwide, it’s used by 923 of 1,349 commercial vessels not powered by conventional fuels, according to a study last year by DNV, a Norway-based maritime accreditation society. Vessels with batteries or hybrid systems placed a distant second.

Many environmentalists oppose LNG because it emits methane, another potent greenhouse gas. Defenders say it’s the quickest and most cost-effective bunker fuel substitute.

Of 1,046 alternative-energy ships on order, 534 are powered by LNG while 417 are battery-hybrids, DNV reported. Thirty-five others will use methanol, which analysts consider an up-and-coming cleaner alternative.

Moller-Maersk plans to launch 12 cargo vessels next year that will use “green methanol” produced with renewable sources such as plant waste. A biodiesel from used cooking oil fuels some of its ships.

The company is collaborating on research that may lead to ammonia- or hydrogen-powered vessels by the mid-2030s.

“This is the first step toward the turnover of our fleet into something much more climate-friendly,” Kindberg said.

Norsepower offers a new twist on an ancient technology: wind.

The Finnish company has developed “rotor sails”—composite cylinders about 33 yards (30 meters) tall that are fitted on ship decks and spin in the breeze. Air pressure differences on opposite sides of the whirring devices help push a vessel forward.

An independent analysis found rotor sails installed on a Maersk oil tanker in 2018 produced an 8.2% fuel savings in a year. Norsepower CEO Tuomas Riski said others have saved 5% to 25%, depending on wind conditions, ship type and other factors.

Thirteen ships are using the devices or have them on order, Riski said.

“Mechanical sails have an essential role in the decarbonization of shipping,” he said. “They can’t do it alone, but they can make a great contribution.”

Fleetzero contends electric ships are best suited to wean the industry off carbon. The company was founded two years ago in Alabama to build cargo vessels with rechargeable battery packs.

CEO Steven Henderson says it envisions fleets of smaller, nimbler ships than huge container vessels. They would call at ports that have freshly charged batteries to swap for ones running low. Fleetzero’s prototype ship is slated to begin delivering cargo later this year.

Who goes first?

Before building or buying low-emission vessels, companies want assurances clean fuels will be available and affordable.

Companies producing the fuels, meanwhile, want enough ships using them to guarantee strong markets.

And both need port infrastructure that accommodates new-generation ships, such as electrical hookups and clean fuel dispensing mechanisms.

But ports await demand to justify such expensive upgrades. Switching onshore cargo handling equipment and trucks to zero-emission models will cost the Los Angeles port $20 billion, officials say.

“Once you put a (green) corridor on the map,” said Jason Anderson, senior program director for the nonprofit ClimateWorks Foundation, “at least they’re heading in the same direction.”

Success will require government regulation and corridor funding, along with support from shipping industry customers, said Jing Sun, a University of Michigan marine engineering professor.

“Shipping is the most cost-effective way of moving things around,” Sun said.

An organization called Cargo Owners for Zero Emission Vessels pledges to use only zero-emission shipping companies by 2040. Among 19 signatories are Amazon, Michelin and Target.

“When big corporate buyers come together and say we need this to happen, the rest of the chain has confidence to make needed investments,” said Ingrid Irigoyen, an assistant director of the nonprofit Aspen Institute, which helped assemble the group.

© 2023 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed without permission.

Twitter has dropped out of a voluntary European Union agreement to combat online disinformation, a top EU official said Friday.

European Commissioner Thierry Breton tweeted that Twitter had pulled out of the EU’s disinformation “code of practice” that other major social media platforms have pledged to support. But he added that Twitter’s “obligation” remained, referring to the EU’s tough new digital rules taking effect in August.

“You can run but you can’t hide,” Breton said.

San Francisco-based Twitter responded with an automated reply, as it does to most press inquiries, and did not comment.

The decision to abandon the commitment to fighting false information appears to be the latest move by billionaire owner Elon Musk to loosen the reins on the social media company after he bought it last year. He has rolled back previous anti-misinformation rules, and has thrown its verification system and content-moderation policies into chaos as he pursues his goal of turning Twitter into a digital town square.

Google, TikTok, Microsoft and Facebook and Instagram parent Meta are among those that have signed up to the EU code, which requires companies to measure their work on combating disinformation and issue regular reports on their progress.

There were already signs Twitter wasn’t prepared to live up to its commitments. The European Commission, the 27-nation bloc’s executive arm, blasted Twitter earlier this year for failing to provide a full first report under the code, saying it provided little specific information and no targeted data.

Breton said that under the new digital rules that incorporate the code of practice, fighting disinformation will become a “legal obligation.”

“Our teams will be ready for enforcement,” he said.

© 2023 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed without permission.

A prototype quantum sensor with potential applications in GPS-free navigation, developed at Imperial College London, has been tested in collaboration with the Royal Navy.

The test marks an important step in bringing new quantum technologies out of the lab and into real-world settings.

Many navigation systems today rely on global navigation satellite systems (GNSS), such as GPS, which uses signals from satellites orbiting the Earth. However, GPS navigation is not always accessible, obstacles like tall buildings can easily block the satellite signals, and they are also susceptible to jamming, imitation, or denial, thereby preventing accurate navigation. It has been estimated that a single day of satellite service denial would incur a cost of £1 billion to the UK.

Self-contained satellite-free navigation systems do exist; however, current technologies drift over time, meaning they lose accuracy unless regularly calibrated with satellites. The quantum sensor has the potential to remove this drift, significantly improving the accuracy over long timescales.

The Imperial College London team unveiled their first ‘quantum compass’ prototype in 2018, and have since been refining the technology to the point where it can now be tested in the field.

Real-world environments

The latest Imperial quantum sensor was integrated into a Qinetiq NavyPOD—an interchangeable rapid prototyping platform, before setting sail to London aboard a new Royal Navy research ship the XV Patrick Blackett.

The experiment is the first step towards understanding the application and exploitation of quantum-enabled navigation, which could provide significant navigational advantages when operating in satellite-denied areas.

Dr. Joseph Cotter, lead scientist on the quantum sensor from the Department of Physics at Imperial, said, “Access to the Patrick Blackett provides us with a unique opportunity to take quantum sensors out of the lab and into the real-world environments, where they are needed.”

Commander Michael Hutchinson, Commanding Officer of XV Patrick Blackett, said, “Working with Imperial College London on this project has been an exciting and interesting opportunity for all of us. So far, the testing has gone well but the technology is still in its very early stages. It’s great to be a part of Royal Navy history.”

Exploiting ultracold atoms

The Imperial quantum sensor is a new type of accelerometer. Accelerometers measure how an object’s velocity changes over time. By combining this information with rotation measurements and the initial position of the object, the current location can be calculated.

Conventional accelerometers are used in many different devices such as mobile phones and laptops. However, these sensors cannot maintain their accuracy over longer periods of time without an external reference.

The quantum accelerometer uses ultracold atoms to make highly accurate measurements. When cooled to extremely low temperatures the atoms start to display their ‘quantum’ nature, resulting in wave-like properties. As the atoms move through the sensor, an ‘optical ruler’ is formed by using a series of laser pulses. This allows the acceleration of the atoms to be precisely measured.

Quantum legacy

These new tests build on a legacy of quantum research at Imperial. Imperial has formed the Centre for Quantum Engineering, Science and Technology (QuEST) to translate discoveries in quantum science into transformative quantum technologies.

Professor Peter Haynes, Director of QuEST at Imperial, says, “The quantum accelerometer is a pioneering technology at the forefront of quantum innovation. It has the potential to transform navigation by making it more accurate and secure.”

“This work represents the latest advance in Imperial’s long track record of world-leading research in quantum science and technology. With deep expertise in basic science, engineering and translation, we are focussed on making quantum technologies—and the benefits they hold—a reality.”

The XV Patrick Blackett ship also has another Imperial connection. The 1948 Nobel Prize winner Professor Lord Blackett was head of the Imperial College Department of Physics from 1953 to 1963 and the main building on the South Kensington campus still bears his name.

Reconfigurable intelligent surface (RIS) has become a promising technology in future 6G communications. Thanks to its high array gain, low cost, and low power consumption, RISs can improve spectral efficiency and reduce power consumption. The RISs widely studied in most existing works are usually passive RISs.

Specifically, a passive RIS comprises a large number of passive elements each being able to reflect the incident signal with a controllable phase shift. By properly adjusting to manipulate the signals reflected by the RIS elements to coherently add with the same phase at the receiver, a high array gain can be achieved.

“Unfortunately, in practice, this expected high capacity gain often cannot be realized in many communication scenarios,” said Prof. Linglong Dai, the leader of a wireless research team from Tsinghua University, “the reason for this negative result is the ‘multiplicative fading’ effect introduced by passive RISs.”

Prof. Dai pointed out that the equivalent path loss of the transmitter-RIS-receiver reflected link is the product (instead of the sum) of the path losses of the transmitter-RIS and RIS-receiver links, and thus it is thousands of times larger than that of the unobstructed direct link. Thereby, for an RIS to realize a noticeable capacity gain, thousands of RIS elements are required to compensate for this serious path loss.

To overcome this fundamental limitation, the research team, led by Prof. Dai, proposed the concept of active RISs in their recently published articles. “Unlike conventional passive RISs that reflect signals without amplification, active RISs can amplify the reflected signals via amplifiers integrated into their elements so as to compensate for the large path loss of RIS-aided links,” said Zijian Zhang, the team member who has worked on active RISs for several years.

To characterize the signal amplification and incorporate the noise introduced by the active components, the research team developed and verified the signal model of active RISs through the experimental measurements based on a fabricated active RIS element. Based on the verified signal model, they also analyzed the asymptotic performance of active RISs, and a joint transmit beamforming and reflect precoding scheme was proposed to maximize the sum-rate of an active RIS aided multi-user multiple-input single-output (MU-MISO) system.

Simulation results showed that, in a typical wireless system, passive RISs can realize only a limited sum-rate gain of 22%, while active RISs can achieve a significant sum-rate gain of 130%, thus overcoming the “multiplicative fading” effect.

Prof. Dai said that they also developed a 64-element active RIS aided wireless communication prototype, aiming to reveal the substantial capacity gain of active RISs in real-world system. By moving the user at different locations and dynamically configuring the phase shift of the active RIS, the research team obtain the experimental results of this prototype.

“Compared with the received power for the metal plate, the active RIS can always achieve a gain of about 10 dB,” said Zhang. “The data rate for the active RIS can hold at about 30 Mbps, while that for a metal plate with the same size only ranges from 1 Mbps to 2Mbps.”

Zhang explained that the beamforming at the active RIS can make the reflected beam with high array gain and reflection gain, while the metal plate can only reflect the incident signals randomly without in-phase combination or amplification, which finally validated the significant gain of active RISs.

The findings are published in the journal IEEE Transactions on Communications.

Provided by
Tsinghua University Press

As artificial intelligence programs continue to develop and access is easier than ever, it’s making it harder to separate fact from fiction. Just this week, an AI-generated image of an explosion near the Pentagon made headlines online and even slightly impacted the stock market until it was quickly deemed a hoax.

Cayce Myers, a professor in Virginia Tech’s School of Communication, has been studying this ever evolving technology and shares his take on the future of deep fakes and how to spot them.

“It is becoming increasingly difficult to identify disinformation, particularly sophisticated AI generated deep fake,” says Myers. “The cost barrier for generative AI is also so low that now almost anyone with a computer and internet has access to AI.”

Myers believes because of this we will see a lot more disinformation—both visual and written—over the next few years. “Spotting this disinformation is going to require users to have more media literacy and savvy in examining the truth of any claim.”

While photoshop programs have been used for years, Myers says the difference between that and disinformation created with AI is one of sophistication and scope. “Photoshop allows for fake images, but AI can create altered videos that are very compelling. Given that disinformation is now a widespread source of content online this type of fake news content can reach a much wider audience, especially if the content goes viral.”

When it comes to combating disinformation, Myers says there are two main sources—ourselves and the AI companies.

“Examining sources, understanding warning signs of disinformation, and being diligent in what we share online is one personal way to combat the spread of disinformation,” he says. “However, that is not going to be enough. Companies that produce AI content and social media companies where disinformation is spread will need to implement some level of guardrails to prevent the widespread disinformation from being spread.”

Myers explains the problem is that the technology of AI has developed so fast that it’s likely that any mechanism to prevent the spread of AI generated disinformation will not be full proof.

Attempts to regulate AI are going on in the U.S. at the federal, state, and even local level. Lawmakers are considering a variety of issues including disinformation, discrimination, intellectual property infringement, and privacy.

“The issue is that lawmakers do not want to create a new law regulating AI before we know where the technology is going. Creating a law too fast can stifle AI’s development and growth, creating one too slow may open the door for a lot of potential problems. Striking a balance will be a challenge,” says Myers.

Neuralink, Elon Musk’s brain-implant company, has won US approval to test on humans. Here is what to know about the multi-billionaire’s dream project to enable the human brain to communicate directly with computers.

Cyborg future?

Neuralink is a neurotechnology company co-founded by Musk along with a team of scientists and engineers in 2016 to build direct communication channels between the brain and computers.

The aim is to supercharge human capabilities, treat neurological disorders like ALS or Parkinson’s, and ultimately achieve a symbiotic relationship between humans and artificial intelligence.

Neuralink’s technology would mainly work through an implant called the “Link”—a device about the size of five stacked coins that would be placed inside the human brain through invasive surgery.

The hardware would harbor electrodes capable of both recording neural activity and stimulating specific regions of the brain.

Researchers hope the implant’s powers will also treat paralysis, spinal cord injuries and brain disorders.

It could also potentially blur the line between human consciousness and computing, an idea that has long excited technologists, while feeding nightmares of a dystopian future taken over by cyborgs.

Last year, 78 percent of US adults surveyed by Pew Research said they probably or definitely would not want a computer chip implanted in their brain to process information faster.

Many competitors

According to data company Pitchbook, California-based Neuralink has more than 400 employees and has raised at least $363 million.

Though he wins most of the headlines, Musk is hardly alone in trying to make advances in the field, which is officially known as brain-machine or brain-computer interface research.

Hit with delays, the tycoon had reportedly reached out to join forces with implant developer Synchron about a potential investment. Its implant version does not require cutting into the skull to install it, unlike Neuralink’s Link.

The Australia-based Synchron implanted its first device in a US patient in July 2022.

Another implant project, but designed for research purposes, is from company Blackrock Neurotech and has also received FDA approval for human testing.

A Neuralink co-founder has also split from Musk and raised venture capital for his own project at a startup called Science.

Other companies seeking to make a play in the sector include BrainCo, Kernel and CTRL-Labs, now a part of Meta’s virtual reality division.

Animal testing

The FDA approval for human testing comes at a great relief for Neuralink which until now had been testing its implants in monkeys and other animals.

Reuters reported in December that the United States Department of Agriculture (USDA) had opened an investigation into potential violations of the Animal Welfare Act at Neuralink.

The report estimated that Neuralink killed about 1,500 animals, including more than 280 sheep, pigs and monkeys for research since 2018.

The USDA refused to confirm or deny the report to AFP at the time.

Arch rival Synchron reportedly killed only about 80 sheep as part of its research, according to documents seen by Reuters.

© 2023 AFP