Aurelia Butler

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  • 125 Shares119 Views

    in Computers Math

    Hey, Siri: Moderate AI voice speed encourages digital assistant use

    Voice speed and interaction style may determine whether a user sees a digital assistant like Alexa or Siri as a helpful partner or something to control, according to a team led by Penn State researchers. The findings reveal insights into the parasocial, or one-sided, relationships that people can form with digital assistants, according to the researchers.
    They reported their findings in the Journal of Business Research.
    “We endow these digital assistants with personalities and human characteristics, and it impacts how we interact with the devices,” said Brett Christenson, assistant clinical professor of marketing at Penn State and first author of the study. “If you could design the perfect voice for every consumer, it could be a very useful tool.”
    The researchers found that a digital assistant’s moderate talking speed, compared to faster and slower speeds, increased the likelihood that a person would use the assistant. In addition, conversation-like interactions, rather than monologues, mitigated the negative effects of faster and slower voice speeds and increased user trust in the digital assistant, according to the researchers.
    “As people adopt devices that can speak to them, having a consistent, branded voice can be used as a strategic competitive tool,” Christenson said. “What this paper shows is that when you’re designing the voice of a digital assistant, not all voices are equal in terms of their impact on the customer.”
    Christenson and his colleagues conducted three experiments to measure how changing the voice speed and interaction style of a digital assistant affected a user’s likelihood to use and trust the device. In the first study, they asked 753 participants to use a digital assistant to help them create a personal budget. The digital assistant recited a monological, or one-way, script at either a slow, moderate or fast pace.
    The researchers then asked the participants how likely they would be to use the digital assistant to create a personal budget, measuring responses from one, not at all likely, to seven, very likely. They found that participants who heard the moderate voice speed were more likely to use the digital assistant than those who heard the slow or fast voices. More

  • 88 Shares149 Views

    in Computers Math

    Scientists train AI to illuminate drugs’ impact

    An ideal medicine for one person may prove ineffective or harmful for someone else, and predicting who could benefit from a given drug has been difficult. Now, an international team led by neuroscientist Kirill Martemyanov, Ph.D., based at The Herbert Wertheim UF Scripps Institute for Biomedical Innovation & Technology, is training artificial intelligence to assist.
    Martemyanov’s group used a powerful molecular tracking technology to profile the action of more than 100 prominent cellular drug targets, including their more common genetic variations. The scientists then used that data to develop and train an AI-anchored platform. In a study that appears in the Oct. 31 issue of the journal Cell Reports, Martemyanov and colleagues report that their algorithm predicted with more than 80% accuracy how cell surface receptors would respond to drug-like molecules.
    The data used to train the algorithm was gathered over a decade of experimentation. Their long-range goal is to refine the tool and use it to help power the design of true precision medications, said Martemyanov, who chairs the institute’s neuroscience department.
    “We all think of ourselves as more or less normal, but we are not. We are all basically mutants. We have tremendous variability in our cell receptors,” Martemyanov said. “If doctors don’t know what exact genetic alteration you have, you just have this one-size-fits-all approach to prescribing, so you have to experiment to find what works for you.”
    One-third of all drugs work by binding to cell-surface receptors called G protein-coupled receptors, or GPCRs. These are complexes that cross the cell membrane, with a “docking station” on the cell’s exterior and a branch that extends into the cell. When a drug pulls into its GPCR dock, the branch moves, triggering a G protein inside the cell and setting off a cascade of changes, like falling dominoes.
    The result of activating or blocking this process might be anything from pain relief, quieting allergies or reducing blood pressure. Besides medications, other things like hormones, neurotransmitters and even scents dock with GPCRs to direct biological activities.
    Scientists have catalogued about 800 GPCRs in humans. About half are dedicated to senses, especially smell. About 250 more receive medicines or other known molecules. Martemyanov’s team had to invent a new protocol to observe and document them. They found many surprises. Some GPCRs worked as expected, but others didn’t, notably those for neurotransmitters called glutamate. More

  • 150 Shares169 Views

    in Computers Math

    Late not great — imperfect timekeeping places significant limit on quantum computers

    New research from a consortium of quantum physicists, led by Trinity College Dublin’s Dr Mark Mitchison, shows that imperfect timekeeping places a fundamental limit to quantum computers and their applications. The team claims that even tiny timing errors add up to place a significant impact on any large-scale algorithm, posing another problem that must eventually be solved if quantum computers are to fulfil the lofty aspirations that society has for them.
    It is difficult to imagine modern life without clocks to help organise our daily schedules; with a digital clock in every person’s smartphone or watch, we take precise timekeeping for granted — although that doesn’t stop people from being late!
    And for quantum computers, precise timing is even more essential, as they exploit the bizarre behaviour of tiny particles — such as atoms, electrons, and photons — to process information. While this technology is still at an early stage, it promises to dramatically speed up the solution of important problems, like the discovery of new pharmaceuticals or materials. This potential has driven significant investment across the private and public sector, such as the establishment of the Trinity Quantum Alliance academic-industrial partnership launched earlier this year.
    Currently, however, quantum computers are still too small to be useful. A major challenge to scaling them up is the extreme fragility of the quantum states that are used to encode information. In the macroscopic world, this is not a problem. For example, you can add numbers perfectly using an abacus, in which wooden beads are pushed back and forth to represent arithmetic operations. The wooden beads have very stable states: each one sits in a specific place and it will stay in place unless intentionally moved. Importantly, whether you move the bead quickly or slowly does not affect the result.
    But in quantum physics, it is more complicated.
    “Mathematically speaking, changing a quantum state in a quantum computer corresponds to a rotation in an abstract high-dimensional space,” says Jake Xuereb from the Atomic Institute at the Vienna University of Technology, the first author of the paper. “In order to achieve the desired state in the end, the rotation must be applied for a very specific period of time — otherwise you turn the state either too little or too far.”
    Given that real clocks are never perfect, the team investigated the impact of imperfect timing on quantum algorithms. More

  • 88 Shares129 Views

    in Computers Math

    Accelerating AI tasks while preserving data security

    With the proliferation of computationally intensive machine-learning applications, such as chatbots that perform real-time language translation, device manufacturers often incorporate specialized hardware components to rapidly move and process the massive amounts of data these systems demand.
    Choosing the best design for these components, known as deep neural network accelerators, is challenging because they can have an enormous range of design options. This difficult problem becomes even thornier when a designer seeks to add cryptographic operations to keep data safe from attackers.
    Now, MIT researchers have developed a search engine that can efficiently identify optimal designs for deep neural network accelerators, that preserve data security while boosting performance.
    Their search tool, known as SecureLoop, is designed to consider how the addition of data encryption and authentication measures will impact the performance and energy usage of the accelerator chip. An engineer could use this tool to obtain the optimal design of an accelerator tailored to their neural network and machine-learning task.
    When compared to conventional scheduling techniques that don’t consider security, SecureLoop can improve performance of accelerator designs while keeping data protected.
    Using SecureLoop could help a user improve the speed and performance of demanding AI applications, such as autonomous driving or medical image classification, while ensuring sensitive user data remains safe from some types of attacks.
    “If you are interested in doing a computation where you are going to preserve the security of the data, the rules that we used before for finding the optimal design are now broken. So all of that optimization needs to be customized for this new, more complicated set of constraints. And that is what [lead author] Kyungmi has done in this paper,” says Joel Emer, an MIT professor of the practice in computer science and electrical engineering and co-author of a paper on SecureLoop. More

  • 175 Shares169 Views

    in Computers Math

    The brain may learn about the world the same way some computational models do

    To make our way through the world, our brain must develop an intuitive understanding of the physical world around us, which we then use to interpret sensory information coming into the brain.
    How does the brain develop that intuitive understanding? Many scientists believe that it may use a process similar to what’s known as “self-supervised learning.” This type of machine learning, originally developed as a way to create more efficient models for computer vision, allows computational models to learn about visual scenes based solely on the similarities and differences between them, with no labels or other information.
    A pair of studies from researchers at the K. Lisa Yang Integrative Computational Neuroscience (ICoN) Center at MIT offers new evidence supporting this hypothesis. The researchers found that when they trained models known as neural networks using a particular type of self-supervised learning, the resulting models generated activity patterns very similar to those seen in the brains of animals that were performing the same tasks as the models.
    The findings suggest that these models are able to learn representations of the physical world that they can use to make accurate predictions about what will happen in that world, and that the mammalian brain may be using the same strategy, the researchers say.
    “The theme of our work is that AI designed to help build better robots ends up also being a framework to better understand the brain more generally,” says Aran Nayebi, a postdoc in the ICoN Center. “We can’t say if it’s the whole brain yet, but across scales and disparate brain areas, our results seem to be suggestive of an organizing principle.”
    Nayebi is the lead author of one of the studies, co-authored with Rishi Rajalingham, a former MIT postdoc now at Meta Reality Labs, and senior authors Mehrdad Jazayeri, an associate professor of brain and cognitive sciences and a member of the McGovern Institute for Brain Research; and Robert Yang, an assistant professor of brain and cognitive sciences and an associate member of the McGovern Institute. Ila Fiete, director of the ICoN Center, a professor of brain and cognitive sciences, and an associate member of the McGovern Institute, is the senior author of the other study, which was co-led by Mikail Khona, an MIT graduate student, and Rylan Schaeffer, a former senior research associate at MIT.
    Both studies will be presented at the 2023 Conference on Neural Information Processing Systems (NeurIPS) in December. More

  • 100 Shares159 Views

    in Physics

    Salty sweat helps one desert plant stay hydrated

    Sweat keeps some animals cool in scorching heat. Salty secretions also serve one desert shrub a refreshing sip of water. 

    The Athel tamarisk uses a special selection of salts excreted from its leaves to pull water from the air, researchers report October 30 in the Proceedings of the National Academy of Sciences. This study provides new insights into the clever chemical strategies that plants have evolved to survive in harsh environments.

    The Athel tamarisk (Tamarix aphylla) thrives in the arid, salt-rich soils of coastal flats across the Middle East. That’s because the tamarisk is a halophyte, a type of plant that secretes excess salt in concentrated droplets from glands in its leaves. The moisture from these briny excretions dissipates in the heat of the day, leaving the tamarisk encrusted in white crystals that shake off in the wind.

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    While driving through the hot, humid deserts of the United Arab Emirates, materials scientist Marieh Al-Handawi of New York University Abu Dhabi noticed water condensing on these crystals. There are lots of plants with leaf structures adapted to attract liquid water from fog. But Al-Handawi, who looks to nature for strategies to tackle water scarcity, suspected that the chemical composition of the excreted salts might have something to do with the dew.

    To investigate, Al-Handawi and her team recorded time-lapse videos of Athel tamarisk plants in their natural habitat. These recordings showed that salt crystals that form from daytime excretions swell with water at night. Back in the lab, the researchers found that at 35° Celsius and 80 percent relative humidity, a naturally encrusted branch collected 15 milligrams of water on its leaves after two hours, while a washed branch yielded only about one-tenth as much.

    “This result was conclusive to us,” Al-Handawi says, “because it proved salts are the main contributor to the water harvesting, and it’s not the surface of the plant.” What’s more, the researchers observed dew form on the crystals down to just 50 percent relative humidity. 

    When the scientists scrutinized the mineral makeup of the tamarisk’s saline sprinkles, they found more than 10 different types of salt all crystallized together. These crystals are made mostly of sodium chloride and gypsum. Yet the researchers also spotted traces of a secret ingredient: lithium sulfate. This mineral is exceptionally good at taking in water and at much lower humidity than either sodium chloride or gypsum. While sodium chloride and gypsum bring in the largest volumes of water, the addition of lithium sulfate to the mineral mélange, the researchers say, helps explain how the tamarisk collects water even at low humidity.

    “This paper provides a new level of detailed understanding of how some desert plants can both excrete salt and use it to take up water from the air into leaves,” says plant physiologist and ecologist Lawren Sack of UCLA, who was not involved in the study.

    He is excited to see the chemical complexity of the salts involved. Desert plants have evolved intricate chemical strategies to squeeze every last drop of water from the environment, he says, and most of those systems await discovery.

    Al-Handawi agrees, noting that the salt recipe may differ across regions and seasons. It makes her hopeful, she says, that there are other exciting water-harvesting materials waiting to be found in the desert. More

  • 88 Shares169 Views

    in Computers Math

    Powder engineering adds AI to the mix

    A research team at Osaka Metropolitan University has developed a new simulation method that accurately predicts powder mixing using AI, and has succeeded in increasing calculation speed by approximately 350 times while maintaining the same level of accuracy as conventional methods. This method is expected to not only pave the way for more efficient and precise powder mixing processes but also open up new possibilities for industries seeking to enhance product quality and streamline production.
    Imagine a world without powders. It may sound exaggerated, but our daily lives are intricately connected to powders in various ways from foods, pharmaceuticals, cosmetics to batteries, ceramics, etc. In all these industries, powder mixing is an important unit operation where different types of powders are mixed to achieve uniformity. However, it can be difficult to predict what conditions are optimal to achieve the desired uniformity as the process often relies on trial and error as well as engineers’ expertise.
    Numerical simulations using the discrete element method (DEM) have been used widely as an approach that can accurately predict powder mixing. This is achieved by calculating the motion of all particles in a very short time range (1/1,000,000 of a second), calculating the motion of the entire powder using the calculated values, and then repeating the process over and over again to calculate the motion of each particle a short time ahead. Therefore, the substantial amount of time it takes to predict powder mixing significantly hampers the ability to have large-scale and long-duration powder mixing processes.
    A research team led by Associate Professor Hideya Nakamura, Associate Professor Shuji Ohsaki, Professor Satoru Watano, and Ph.D. student Naoki Kishida from the Graduate School of Engineering at Osaka Metropolitan University has developed a new simulation method using AI. Additionally, the team has succeeded in enhancing computational speed by about 350 times. This new method is characterized by using a recurrent neural network (RNN) that enables a long-time-scale powder mixing simulation with low computational costs while maintaining the same level of accuracy as conventional methods.
    “We have successfully harnessed our knowledge in powder technology, which we have honed over many years, and combined it with machine learning to rapidly predict the unique behavior of complex powders,” explained Professor Nakamura. “We would like to build upon this achievement to contribute to the future of industries seeking to enhance product quality and streamline production.” More

  • 113 Shares99 Views

    in Computers Math

    Virtual meetings tire people because we’re doing them wrong

    New research suggests sleepiness during virtual meetings is caused by mental underload and boredom. Earlier studies suggested that fatigue from virtual meetings stems from mental overload, but new research from Aalto University shows that sleepiness during virtual meetings might actually be a result of mental underload and boredom.
    ‘I expected to find that people get stressed in remote meetings. But the result was the opposite — especially those who were not engaged in their work quickly became drowsy during remote meetings,’ says Assistant Professor Niina Nurmi, who led the study.
    The researchers measured heart rate variability during virtual meetings and face-to-face meetings, examining different types of fatigue experiences among 44 knowledge workers across nearly 400 meetings. The team at Aalto collaborated with researchers at the Finnish Institute of Occupational Health, where stress and recovery are studied using heart rate monitors. The paper was published in the Journal of Occupational Health Psychology.
    ‘We combined physiological methods with ethnographic research. We shadowed each subject for two workdays, recording all events with time stamps, to find out the sources of human physiological responses,’ Nurmi says.
    The study also included a questionnaire to identify people’s general attitude and work engagement.
    ‘The format of a meeting had little effect on people who were highly engaged and enthusiastic about their work. They were able to stay active even during virtual meetings. On the other hand, workers whose work engagement was low and who were not very enthusiastic about their work found virtual meetings very tiring.’
    It’s easier to maintain focus in face-to-face meetings than virtual ones, as the latter have limited cognitive cues and sensory input. ‘Especially when cameras are off, the participant is left under-stimulated and may start to compensate by multitasking,’ Nurmi explains.
    Although an appropriate level of stimulation is generally beneficial for the brain, multitasking during virtual meetings is problematic. Only highly automated tasks, such as walking, can be properly carried out during a virtual meeting.
    ‘Walking and other automated activities can boost your energy levels and help you to concentrate on the meeting. But if you’re trying to focus on two things that require cognitive attention simultaneously, you can’t hear if something important is happening in the meeting. Alternatively, you have to constantly switch between tasks. It’s really taxing for the brain,’ Nurmi says. More