Engineering
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KAIST Researchers Fabricate Defect-free Graphene for Lithium-ion Batteries
Although graphene has been hailed as promising materials for lithium-ion batteries, making it for large-scale production has remained a challenging task for researchers. So far, high-quality graphene has been produced at the expense of large volume. It is possible to fabricate bulk quantities of graphene, but they will likely contain many defects.
Recently, a KAIST research team, headed by Professors Jung-Ki Park and Hee-Tak Kim from the Department of Chemical and Biomolecular Engineering, developed a fabrication method to produce a large amount of defect-free graphene (df-G) while preserving the structural integrity of the graphene.
This research result was published online in the July 11, 2014 issue of Nano Letters, entitled "Defect-free, Size-tunable Graphene for High-performance Lithium Ion Battery."
Phys.org, a science, research and technology news website, published an article on this research. To read article, please visit the link below:
Phys.org, August 22, 2014
“Scientists fabricate defect-free graphene, set record reversible capacity for Co3O4 node in Li-ion batteries”
http://phys.org/news/2014-08-scientists-fabricate-defect-free-graphene-reversible.html
2014.09.07 View 9402 -
Extracting Light from Graphite: Core Technology of Graphene Quantum Dots Display Developed
Professor Seokwoo Jeon of the Department of Materials Science and Engineering, Professor Yong-Hoon Cho of the Department of Physics, and Professor Seunghyup Yoo of the Department of Electrical Engineering announced that they were able to develop topnotch graphene quantum dots from graphite.
Using the method of synthesizing graphite intercalation compound from graphite with salt and water, the research team developed graphene quantum dots in an ecofriendly way.
The quantum dots have a diameter of 5 nanometers with their sizes equal and yield high quantum efficiency. Unlike conventional quantum dots, they are not comprised of toxic materials such as lead or cadmium. As the quantum dots can be developed from materials which can be easily found in the nature, researchers look forward to putting these into mass production at low cost.
The research team also discovered a luminescence mechanism of graphene quantum dots and confirmed the possibility of commercial use by developing quantum dot light-emitting diodes with brightness of 1,000 cd/m2, which is greater than that of cellphone displays.
Professor Seokwoo Jeon said, “Although quantum dot LEDs have a lower luminous efficiency than existing ones, their luminescent property can be further improved” and emphasized that “using quantum dot displays will allow us to develop not only paper-thin displays but also flexible ones.”
Sponsored by Graphene Research Center in KAIST Institute for NanoCentury, the research finding was published online in the April 20th issue of Advanced Optical Materials.
Picture 1: Graphene quantum dots and their synthesis
Picture 2: Luminescence mechanism of graphene quantum dots
Picture 3: Structure of graphene quantum dots LED and its emission
2014.09.06 View 15932 -
Regulatory T Cells Influence Liver Damage of Hepatitis A Patients
Liver damage becomes more severe with the decrease of regulatory T cells
“This research will aid the development of hepatitis A targeted drug,” said a KAIST researcher.
The KAIST Graduate School of Medical Science and Engineering’s Professor Eui-Cheol Shin and his research team have identified the mechanism, explaining how the regulatory T cells are responsible for the body’s immune system and how they have induced liver damage of hepatitis A patients.
The research results were published online in the July 9th edition of ‘Gut,’ the world’s most prominent journal in the field of gastroenterology.
Hepatitis A is an acute form of hepatitis caused by hepatitis A virus. The virus spreads through oral contact and enters the body via digestive organs.
Regulatory T cells play an important role in maintaining the homeostasis of the body’s immune system by inhibiting the activation of other immune cells. In the case of chronic viral infections, regulatory T cells are known to contribute to the duration of the infection, weakening the immune response to virus infections. However, there has been no information on what roles the regulatory T cells perform in the case of acute viral infections.
The research team used the fluorescence flow cytometry technique to determine the number and characteristics of a variety of immune cells, including regulatory T cells, in the blood of hepatitis A patients.
Consequently, the researchers confirmed that the decrease in the regulatory T cells immune inhibitory ability was consistent with a significant reduction in the number of regulatory T cells in the blood of hepatitis A patients. Furthermore, it was identified that the more noticeable decrease of regulatory T cells led to the occurrence of a more severe liver injury.
The analysis of hepatitis A patient’s blood proved that the cause of the decrease in the number and function of regulatory T cells was the increased expression of cell surface protein ‘Fas,’ which induces cell death.
Professor Shin said, “This study is the first case which proposes the mechanism for clinical aspects in not only hepatitis A, but also acute virus infection.” He added on the future prospect of the research that: “In the future, we can prevent tissue damage by inhibiting cell death of regulatory T cells for severe acute viral infections that do not have an effective treatment for the virus itself.”
[Picture]
The picture shows the process of fluorescence flow cytometry technique to study regulatory T cell in the blood of hepatitis A patients.
2014.08.11 View 9635 -
Newsweek: The Goosebump Sensor That Knows How You Feel
Newsweek covered the introduction of the goosebump sensor invented by Professor Young-Ho Cho of the Department of Bio and Brain Engineering at KAIST in an article dated July 27, 2014.
The article entitled “The Goosebump Sensor That Knows How You Feel” explains how the sensor works and reports on the current research and development trends in emotion-sensing technology.
Professor Cho’s research paper was originally published in the journal Applied Physics Letters on June 24, 2014, titled “A Flexible Skin Piloerection Monitoring Sensor."
Newsweek, July 27, 2014
“The Goosebump Sensor That Knows How You Feel”
http://www.newsweek.com/goosebump-sensor-knows-how-you-feel-260689
2014.07.28 View 7683 -
The Journal of Clinical Investigation: Researchers Uncover the Secret Lymphatic Identity of the Schlemm's Canal
The Journal of Clinical Investigation (JCI), a peer-reviewed, top-tier medical journal published by the American Society for Clinical Investigation, carried a commentary entitled “Schlemm’s Canal: More Than Meets the Eye, Lymphatics in Disguise” in the July 25, 2014 issue.
In the commentary, the authors compared a research paper (“Lymphatic regular PROX1 determines Schlemm’s canal integrity and identity”) by Professor Gou-Young Koh of the Graduate School of Medical Science and Engineering at KAIST with research work from the University of Helsinki (article entitled “The Schlemm’s canal is a VEGF-C/VEGFR-3 responsive lymphatic-like vessel”).
The JCI released a press statement dated July 25, 2014 on its commentary. It mentioned that glaucoma, one of the leading causes of blindness worldwide, elevates eye pressure owing to poor drainage of aqueous humor. A specialized structure called “Schlemm’s canal” funnels aqueous humor from the eye back into circulation, which is critical to prevent pressure buildup in the eye. The article discussed the role of Schlemm’s canal in the context of lymphatic vascular characteristics by reviewing two research group’s papers back-to-back.
For the full text of the press release, please visit the link below:
Press Release from the Journal of Clinical Investigation, July 25, 2014
“Researchers uncover the secret lymphatic identity of the Schlemm’s canal”
http://www.eurekalert.org/pub_releases/2014-07/joci-rut072414.php
2014.07.28 View 7711 -
Professor Kyu-Young Whang Receives Contributions Award from ACM SIGMOD
Kyu-Young Whang, Distinguished Professor of Computer Science at KAIST, was the recipient of the 2014 ACM SIGMOND Contributions Award.
Founded in 1947, the Association for Computing Machinery (ACM) is the world’s largest educational and scientific computing society, delivering resources that advance computing as a science and profession.
SIGMOD is the Association for Computing Machinery’s Special Interest Group on Management of Data, which specializes in large-scale data management problems and databases.
Since 1992, ACM SIGMOND has presented the contributions award to one scientist who has made significant contributions to the field of database systems through research funding, education, and professional services. So far, 23 people including Professor Whang have received the award.
Professor Whang was recognized for his key role in the growth of international conferences and journals in the field of databases such as The VLDB Journal (The International Journal on Very Large Data Bases), VLDB Endowment Inc., IEEE Technical Committee on Data Engineering, and Database Systems for Advanced Applications (DASFAA). IEEE stands for the Institute of Electrical and Electronics Engineering.
For the full list of ACM SIGMOND Contributions Award recipients, please go to
http://www.sigmod.org/sigmod-awards/sigmod-awards#contributions.
2014.07.15 View 8198 -
Workshop on Wearable Healthcare Takes Place on July 15, 2014
A workshop on wearable healthcare was held at KAIST campus on July 15, 2014.
In recent years, wearable healthcare has received much attention as an emerging technology that will have a great impact on our society.
At the workshop, participants from academia and industry reviewed the Korean healthcare industry and discussed issues related to the development of a wearable healthcare industry in Korea, while capitalizing on the nation’s strength in information and communications.
Professor Hoi-Jun Yoo of Electrical Engineering at KAIST, the chairman of the organizing committee of the workshop, presented a keynote speech entitled “The Current State and Future of Wearable Healthcare,” arguing that the wearable healthcare industry developed through the Internet of things and big data would become the next-generation growth engine for Korea.
Other key presentations were “Smart Glasses and Micro Display Semiconductor Technology” by Bo-Eun Kim, Chief Executive Officer of Raon-Tech, Inc., “Wearable Device: A Comprehensive Approach” by Min-Kyu Je, a professor of Daegu Gyeongbuk Institute of Science and Technology, and “Microwave Imaging System for Breast Cancer Detection” by Seung-Joon Lee, a professor of Ewha Woman’s University.
Professor Yoo said, “We hope that the workshop will provide good momentum for participants to evaluate the Korean healthcare industry in the context of the Internet of things, information and communications technology, and medical technology as well as offering practical solutions to nurture the indigenous wearable healthcare industry in Korea.”
2014.07.15 View 8104 -
Professor Min Hyuk Kim Appointed an Associate Editor on ACM Transactions on Graphics
Professor Min Hyuk Kim of KAIST's Computer Science Department has been appointed an associate editor for a prestigious international journal in the field of graphics, ACM Transactions on Graphics (TOG).
Founded in 1947, the Association for Computing Machinery (ACM) is the world’s largest educational and scientific computing society, delivering knowledge that advances computing as a science and profession.
Published during the past 35 years, ACM TOG is a highly regarded, peer-reviewed scientific journal that aims to disseminate the latest findings of research in computer graphics. Professor Kim is the first Korean scholar to serve the journal as an editor.
Professor Kim’s responsibilities are many, and they include selecting appropriate reviewers for submitted manuscripts to be published in the journal and reporting the results of review process.
He said, “The appointment was a great honor, and I’m looking forward to having the opportunity to make further contributions to the advancement of the graphics field.”
Professor Kim has published numerous papers on computer graphics with a focus on research in 3D imaging spectroscopy and visual perception.
2014.07.14 View 9222 -
Professor Sang Ouk Kim receives the 2014 Prime Minister Award for Nano Research
Professor Sang Ouk Kim
Sang Ouk Kim, a professor of Materials Science and Engineering at KAIST, received the 2014 Prime Minister Award from the Korean government for his nano research. The award ceremony, Nano Korea 2014, was held on July 2, 2014 at Coex in Seoul, Korea.
Professor Kim was recognized for his research on the control of various shapes of ultra-fine nano-structures using molecular assembly with ductile materials, such as polymers and carbon nano materials, and for his contribution to the growth of the nano field in Korea.
He developed a new molecular assembly control technology, for the first time in the world, which produced large-scale, ultra-fine nanopatterns through controlling the molecular arrangement of block copolymers. Using this technology, he further created a new semiconductor nanotechnology to reinforce the existing lithographic process of semiconductor manufacturing.
In addition, Professor Kim has focused on making a new type of three-dimensional carbon nano-materials by assembling carbon nanotubes or graphene at the molecular level. Developing a new process to produce nano-materials through the chemical doping process of carbon materials, which can be widely applied to solar cells or energy devices, is one of his research interests as well.
Professor Kim has published a total of 124 papers in international journals, such as Nature, Science, Nature Materials, Nature Communications, Advanced Materials, and Nano Letters. He was recently invited by Advanced Materials to contribute a review article for its 25th anniversary issue.
Professor Kim received both the KAIST Academic Award and the 13th Young Scientist Award of Korea in 2010. Since March 2014, he has served as one of the chair professors of KAIST.
Most recently, he was selected as the Scientist of the Month in June 2014 by the Ministry of Science, ICT and Future Planning, Republic of Korea, and the National Research Foundation of Korea.
2014.07.08 View 8719 -
Professor Haeng-Ki Lee appointed as "ICCES Distinguished Fellow"
Professor Haeng-Ki Lee
Professor Haeng-Ki Lee from the Department of Civil and Environmental Engineering at KAIST has been appointed as “Distinguished Fellow” and has also received the “Outstanding Research Award” at the International Conference on Computational & Experimental Engineering and Sciences (ICCES).
Founded in 1986, ICCES is regarded as one of the most prestigious international conferences in the field of computational mechanics and experimental engineering.
The Nominating Committee at ICCES recommends the appointment of a distinguished member who has made significant contributions to the development of computational mechanics and experimental engineering. Professor Lee was the first Korean who received such title. Furthermore, he was the recipient of the “Outstanding Research Award” presented by ICCES for his academic research on damage mechanics of complex systems.
Professor Lee is currently serving as the Head of the Department of Civil and Environmental Engineering at KAIST and the Director of BK Plus Agency, a Korean government’s research program. He received an award from the Minister of Science, ICT and Future Planning in 2013 for the promotion of science and technology.
2014.07.02 View 10289 -
JEROS, a jellyfish exterminating robot, appears in a US business and technology news
Business Insider, a US business and technology news website launched in 2006 and based in New York City, published a story about JEROS, a robot that disposes of ever-increasing jellyfish in the ocean.
JEROS was the brainchild of Professor Hyun Myung at the Department of Civil and Environmental Engineering, KAIST. It can shred almost one tons worth of jellyfish per hour.
For the story, please visit the following link:
Business Insider, June 24, 2014
“These Jellyfish-Killing Robots Could Save the Fishing Industry Billions Per Year”
http://www.businessinsider.com/jellyfish-killing-robot-2014-6
JEROS in action
2014.06.26 View 8337 -
KAIST Researchers Develops Sensor That Reads Emotional States of Users
A piloerection monitoring sensor attached on the skin
The American Institute of Physics distributed a press release dated June 24, 2014 on a research paper written by a KAIST research team, which was published in its journal entitled Applied Physics Letters (APL). APL features concise, up-to-date reports in significant new findings in applied physics.
According to the release, “KAIST researchers have developed a flexible, wearable 20 mm x 20 mm polymer sensor that can directly measure the degree and occurrence on the skin of goose bumps, which is caused by sudden changes in body temperature or emotional states.”
The lead researcher was Professor Young-Ho Cho from the Department of Bio and Brain Engineering at KAIST.
If you would like to read the press release, please go to the link below:
American Institute of Physics, June 24, 2014
“New technology: The goose bump sensor”
http://www.eurekalert.org/pub_releases/2014-06/aiop-ntt062314.php
2014.06.26 View 8224