(Press-News.org) We live in an era of data deluge. The data centers that are operated to store and process this flood of data use a lot of electricity, which has been called a major contributor to environmental pollution. To overcome this situation, polygonal computing systems with lower power consumption and higher computation speed are being researched, but they are not able to handle the huge demand for data processing because they operate with electrical signals, just like conventional binary computing systems.
The Korea Institute of Science and Technology (KIST, President Seok Jin Yoon) announced that Dr. Do Kyung Hwang of the Center for Opto-Electronic Materials & Devices and Professor Jong-Soo Lee of the Department of Energy Science & Engineering at Daegu Gyeongbuk Institute of Science and Technology (DGIST, President Young Kuk) has jointly developed a new zero-dimensional and two-dimensional (2D-0D) semiconductor artificial junction material and observed the effect of a next-generation memory powered by light. Transmitting data between the computing and storage parts of a multi-level computer using light rather than electrical signals can dramatically increase processing speed.
The research team has fabricated a new 2D-0D semiconductor artificial junction material by joining quantum dots in a core-shell structure with zinc sulfide (ZnS) on the surface of cadmium selenide (CdSe) and a molybdenum sulfide (MoS2) semiconductor. The new material enables the storage and manipulation of electronic states within quantum dots measuring 10 nm or less.
When light is applied to the cadmium selenide core, a certain number of electrons flow out of the molybdenum sulfide semiconductor, trapping holes in the core and making it conductive. The electron state inside cadmium selenide is also quantized. Intermittent light pulses trap electrons in the electron band one after the other, inducing a change in the resistance of the molybdenum sulfide through the field effect, and the resistance changes in a cascading manner depending on the number of light pulses. This process makes it possible to divide and maintain more than 0 and 10 states, unlike conventional memory, which has only 0 and 1 states. The zinc sulfide shell also prevents charge leakage between neighboring quantum dots, allowing each single quantum dot to function as a memory.
While quantum dots in conventional 2D-0D semiconductor artificial junction structures simply amplify signals from light sensors, the team's quantum dot structure perfectly mimics the floating gate memory structure, confirming its potential for use as a next-generation optical memory. The researchers verified the effectiveness of the polynomial memory phenomenon with neural network modeling using the CIFAR-10 dataset and achieved a 91% recognition rate.
Dr. Hwang of KIST said, "The new multi-level optical memory device will contribute to accelerating the industrialization of next-generation system technologies such as artificial intelligence systems, which have been difficult to commercialize due to technical limitations arising from the miniaturization and integration of existing silicon semiconductor devices."
###
KIST was established in 1966 as the first government-funded research institute in Korea. KIST now strives to solve national and social challenges and secure growth engines through leading and innovative research. For more information, please visit KIST’s website at https://eng.kist.re.kr/
This research was supported by the Ministry of Science and ICT (Minister Jong-ho Lee) as a mid-career researcher project and a major project of KIST, and the results were published in the international journal Advanced Materials (IF: 29.4).
Journal Link: Advanced Materials, Jul-2023
END
Ushering in the era of light-powered 'multi-level memories'
KIST Developed technology to store and manipulate electronic states in quantum dots measuring 10 nanometers or less
2023-10-17
ELSE PRESS RELEASES FROM THIS DATE:
Staggering increase in opioid-related deaths among people experiencing homelessness, new study finds
2023-10-17
London, ON, October 17, 2023 – People experiencing homelessness accounted for an increasing proportion of fatal opioid-related deaths in Ontario, Canada, reaching one in six such deaths by 2021, according to new research from ICES, Western University and Lawson Health Research Institute.
In one of the first reports to track the continuous increase in opioid-related mortality in the province among people experiencing homelessness, researchers found that the quarterly proportion of opioid-related overdose ...
Subalpine forests in the Northern Rockies are fire resilient—for now
2023-10-17
Over 4,800 years in the Northern Rockies during wet periods and dry periods, subalpine forests consistently recovered from wildfires, growing back vegetation and leaving evidence of their resilience in lake sediment cores.
Kyra Clark-Wolf, now a CU Boulder postdoc with the North Central Climate Adaptation Center (NC CASC), led the study as part of her dissertation research. NC CASC is a partnership of CU Boulder and the United States Geological Survey.
“I thought we might see different ecosystem responses to past fires between wet and dry periods,” said Clark-Wolf. “But ...
Unique marimo threatened by rising lake temperatures
2023-10-17
Rising lake water temperatures threaten the survival of marimo, unique algal balls found only in cold lakes. Kobe University researchers clarified that the warmer it gets, the more the inward decomposition outpaces the outward growth of these life forms, making them increasingly fragile.
Moss balls, or “marimo” in Japanese, are popular pet water plants that are not a moss but a special growth form of filamentous algae. They are found naturally in lakes in northern Japan and cold lakes of ...
How to scientifically, efficiently, and cost-effectively treat the wastewater generated from anaerobic digestion?
2023-10-17
The resource utilization of waste is an important means to implement the construction of ecological civilization. Agricultural waste contains rich renewable resources and has high potential value in fertilization and energy conversion. Anaerobic digestion technology is a promising technology for treating agricultural waste. Anaerobic digestion refers to the digestion technology in which organic matter is decomposed into CH4, CO2, H2O and H2S by facultative bacteria and anaerobic bacteria under anaerobic conditions, which can transform solid organic matter into soluble organic matter. Not only does it have the advantages of stable process and low operation cost, the biogas produced can also ...
Novel hydrogel finds new aptamers, or ‘chemical antibodies,’ in days
2023-10-17
UNIVERSITY PARK, Pa. — One double-helix strand of DNA could extend six feet, but it is so tightly coiled that it packs an entire sequence of nucleotides into the tiny nucleus of a cell. If that same DNA was instead split into two strands and divided into many, many short pieces, it would become trillions of uniquely folded 3D molecular structures, capable of bonding to and possibly manipulating specifically shaped molecules — if they’re the perfect fit.
These short, single-stranded segments of DNA or RNA are called aptamers, also known as “chemical antibodies.” According to Penn State researchers, ...
Virtual reality helps people with hoarding disorder practice decluttering
2023-10-17
Many people who dream of an organized, uncluttered home à la Marie Kondo find it hard to decide what to keep and what to let go. But for those with hoarding disorder — a mental condition estimated to affect 2.5% of the U.S. population — the reluctance to let go can reach dangerous and debilitating levels.
Now, a pilot study by Stanford Medicine researchers suggests that a virtual reality therapy that allows those with hoarding disorder to rehearse relinquishing possessions in a simulation of their own home could help them declutter ...
Fluctuating blood pressure: a warning sign for dementia and heart disease
2023-10-17
A new study by Australian researchers has shown that fluctuating blood pressure can increase the risk of dementia and vascular problems in older people.
Short blood pressure (BP) fluctuations within 24 hours as well as over several days or weeks are linked with impaired cognition, say University of South Australia (UniSA) researchers who led the study.
Higher systolic BP variations (the top number that measures the pressure in arteries when a heart beats) are also linked with stiffening of the arteries, associated with heart disease.
The findings have been published in the journal Cerebral Circulation – Cognition and ...
Significant gaps in UK public awareness of tell-tale cancer signs in kids and teens
2023-10-17
There are significant gaps in the UK public’s awareness of the tell-tale signs and symptoms of cancer in children and teens, with just a third of adults expressing confidence in being able to recognise them, find the results of a nationally representative survey published online in the journal Archives of Disease in Childhood.
Public awareness of the cancer signs and symptoms in this age group is much lower than it is in adults, suggesting the need for initiatives to plug this knowledge gap, say the researchers.
Childhood cancer is the leading cause of ...
ChatGPT may be better than doctors at evidence-based management of clinical depression
2023-10-17
ChatGPT, the AI language model capable of mirroring human conversation, may be better than a doctor at following recognised treatment standards for clinical depression, and without any of the gender or social class biases sometimes seen in the primary care doctor-patient relationship, finds research published in the open access journal Family Medicine and Community Health.
However, further research is needed into how well this technology might manage severe cases as well as potential risks and ethical issues arising from its use, say the researchers.
Depression is very common, and many of those affected turn first to ...
Immersive virtual reality seems to ease cancer patients’ pain and distress
2023-10-17
Immersive virtual reality—digital technology that allows a person to experience being physically present in a non-physical world—seems to ease the pain and distress felt by patients with cancer, suggests a pooled data analysis of the available evidence published in BMJ Supportive & Palliative Care.
The technology may also have potential for people with other distressing long term conditions, such as multiple sclerosis (MS), kidney disease, and dementia, the findings indicate.
As the physical and practical costs of virtual reality technologies have fallen, interest in their use for improving patients’ quality of life has ...
LAST 30 PRESS RELEASES:
Program takes aim at drinking, unsafe sex, and sexual assault on college campuses
Inability to pay for healthcare reaches record high in U.S.
Science ‘storytelling’ urgently needed amid climate and biodiversity crisis
KAIST Develops Retinal Therapy to Restore Lost Vision
Adipocyte-hepatocyte signaling mechanism uncovered in endoplasmic reticulum stress response
Mammals were adapting from life in the trees to living on the ground before dinosaur-killing asteroid
Low LDL cholesterol levels linked to reduced risk of dementia
Thickening of the eye’s retina associated with greater risk and severity of postoperative delirium in older patients
Almost one in ten people surveyed report having been harmed by the NHS in the last three years
Enhancing light control with complex frequency excitations
New research finds novel drug target for acute myeloid leukemia, bringing hope for cancer patients
New insight into factors associated with a common disease among dogs and humans
Illuminating single atoms for sustainable propylene production
New study finds Rocky Mountain snow contamination
Study examines lactation in critically ill patients
UVA Engineering Dean Jennifer West earns AIMBE’s 2025 Pierre Galletti Award
Doubling down on metasurfaces
New Cedars-Sinai study shows how specialized diet can improve gut disorders
Making moves and hitting the breaks: Owl journeys surprise researchers in western Montana
PKU Scientists simulate the origin and evolution of the North Atlantic Oscillation
ICRAFT breakthrough: Unlocking A20’s dual role in cancer immunotherapy
How VR technology is changing the game for Alzheimer’s disease
A borrowed bacterial gene allowed some marine diatoms to live on a seaweed diet
Balance between two competing nerve proteins deters symptoms of autism in mice
Use of antifungals in agriculture may increase resistance in an infectious yeast
Awareness grows of cancer risk from alcohol consumption, survey finds
The experts that can outsmart optical illusions
Pregnancy may reduce long COVID risk
Scientists uncover novel immune mechanism in wheat tandem kinase
Three University of Virginia Engineering faculty elected as AAAS Fellows
[Press-News.org] Ushering in the era of light-powered 'multi-level memories'KIST Developed technology to store and manipulate electronic states in quantum dots measuring 10 nanometers or less