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Omnidirectional Free Space Wireless Charging Developed
The simultaneous charging of multiple mobile devices at 0.5 meter away from the power source is now possible under the international electromagnetic field guidelines.
Mobile devices, such as smartphones and laptops, have become indispensable portable items in modern life, but one big challenge remains to fully enjoying these devices: keeping their batteries charged.
A group of researchers at KAIST has developed a wireless-power transfer (WPT) technology that allows mobile devices to be charged at any location and in any direction, even if the devices are away from the power source, just as Wi-Fi works for Internet connections. With this technology, so long as mobile users stay in a designated area where the charging is available, e.g., the Wi-Power zone, the device, without being tethered to a charger, will pick up power automatically, as needed.
The research team led by Professor Chun T. Rim of the Nuclear and Quantum Engineering Department at KAIST has made great strides in WPT development. Their WPT system is capable of charging multiple mobile devices concurrently and with unprecedented freedom in any direction, even while holding the devices in midair or a half meter away from the power source, which is a transmitter. The research result was published in the June 2015 on-line issue of IEEE Transactions on Power Electronics, which is entitled “Six Degrees of Freedom Mobile Inductive Power Transfer by Crossed Dipole Tx (Transmitter) and Rx (Receiver) Coils.”
Professor Rim’s team has successfully showcased the technology on July 7, 2015 at a lab on KAIST’s campus. They used high-frequency magnetic materials in a dipole coil structure to build a thin, flat transmitter (Tx) system shaped in a rectangle with a size of 1m2. Either 30 smartphones with a power capacity of one watt each or 5 laptops with 2.4 watts each can be simultaneously and wirelessly charged at a 50 cm distance from the transmitter with six degrees of freedom, regardless of the devices’ three-axes positions and directions. This means that the device can receive power all around the transmitter in three-dimensional space. The maximum power transfer efficiency for the laptops was 34%. The researchers said that to fabricate plane Tx and Rx coils with the six-degree-of-freedom characteristic was a bottleneck of WPT for mobile applications.
Dipole Coil Resonance System (DCRS)
The research team used the Dipole Coil Resonance System (DCRS) to induce magnetic fields, which was developed by the team in 2014 for inductive power transfer over an extended distance. The DCRS is composed of two (transmitting and receiving) magnetic dipole coils, placed in parallel, with each coil having a ferrite core and connected with a resonant capacitor. Comparing to a conventional loop coil, the dipole coil is very compact and has a less dimension. Therefore, a crossed dipole structure has 2-dimension rather than 3-dimension of a crossed loop coil structure. The DCRS has a great advantage to transfer power even when the resonance frequency changes in the range of 1% (Q factor is below 100). The ferrite cores are optimally designed to reduce the core volume by half, and their ability to transfer power is nearly unaffected by human bodies or surrounding metal objects, making DCRS ideal to transmit wireless power in emergency situations. In a test conducted in 2014, Professor Rim succeeded in transferring 209 watts of power wirelessly to the distance of five meters. (See KAIST’s press release on DCRS for details: http://www.eurekalert.org/pub_releases/2014-04/tkai-wpt041714.php.)
Greater Flexibility and Safer Charging
The research team rearranged the two dipole coils from a parallel position to cross them in order to generate rotating magnetic fields, which was embedded in the Tx’s flat platform. This has made it possible for mobile devices to receive power from any direction.
Although wireless-power technology has been applied to smartphones, it could not offer any substantial advantages over traditional wired charging because the devices still require close contact with the transmitter, a charging pad. To use the devices freely and safely, including in public spaces, the WPT technology should provide mobile users with six degrees of freedom at a distance. Until now, all wireless-charging technologies have had difficulties with the problem of short charging distance, mostly less than 10 cm, as well as charging conditions that the devices should be placed in a fixed position. For example, the Galaxy S6 could only be charged wirelessly in a fixed position, having one degree of freedom. The degree of freedom represents mobile devices’ freedom of movement in three-dimensional space.
In addition, the DCRS works at a low magnetic field environment. Based on the magnetic flux shielding technology developed by the research team, the level of magnetic flux is below the safety level of the International Commission on Non-Ionizing Radiation Protection (ICNIRP) guideline (27µT) for general public exposure to electromagnetic field (EMF).
Professor Rim said, “Our transmitter system is safe for humans and compatible with other electronic devices. We have solved three major issues of short charging distance, the dependence on charging directions, and plane coil structures of both Tx and Rx, which have blocked the commercialization of WPT.”
Currently, the research team and KAIST’s spin-off company, TESLAS, Inc., have been conducting pilot projects to apply DCRS in various places such as cafes and offices.
YouTube Link: https://www.youtube.com/watch?v=JU64pMyJioc
Demonstration of 30 Watts Range Omnidirectional Wireless-charging at a Laboratory on KAIST’s Campus
Figure 1: Wide-range omnidirectional wireless-charging system based on DCRS can charge multiple numbers of mobile devices simultaneously in a 1m3 range. The above is a transmitter, and the below is a Samsung Galaxy Note with a receiver embedded inside.
Figure 2: Demonstration of the omnidirectional wireless-charging system (clockwise from top of the left, robust charging despite the presence of metal obstacles, omnidirectional charging, long distance charging, and multiple devices charging)
2015.07.08 View 16028 -
Experts Gather to Develop a Korean Supercomputer on KAIST Campus
KAIST hosted an inauguration ceremony for the Super-Capacity Computing Advancement Forum on July 2, 2015, to increase Korea's national computing capacity. It represents a gathering consisting of experts drawn across industry, university, and institutes in super-capacity computing.
More than ten experts from the university, including President Steve Kang and Professor Oh-Joon Kwon of the Department of Aerospace Engineering, attended the ceremony. This forum was created to secure a competitive edge in the global market by establishing a long-term strategy for the development of super computers.
The recent rise of new service industries, such as voice recognition, artificial intelligence, and the Internet of Things, has increased the need for super-capacity computing to deal more rapidly with big data. The need is made more urgent by increased investment by leading countries in this field.
The forum will organize and operate working-level subcommittees to promote in-depth discussions on issues related to super-capacity computing systems. Open forums and public hearings will be held until October, to gather information and insights needed to advance the field.
President Steve Kang, the Chairman of the Forum, said, “The forum will have a great impact on Korea’s effort to become a world leader in super-capacity computing. We plan to debate the pros and cons of potential solutions to the Korean government, to assist them in building the nation’s competitiveness in super-capacity computing capability.”
2015.07.07 View 5790 -
Professor Jae Kyu Lee Appointed the President of Association for Information Systems
Chair Professor Jae Kyu Lee of KAIST’s College of Business was appointed the President of Association for Information Systems (AIS) on July 1, 2015. Professor Lee will serve a one-year term, which will end in June 2016. With four thousand members researching information systems from 90 different nations, AIS is the largest academic society in the fields of information system and business process engineering.
Professor Lee has proposed his idea of “the Bright Internet” as the official vision of AIS. Employing this vision, AIS will create technology and systems, as well as sponsor international cooperation to solve fundamental issues of the Internet including concerns over hacking and cyber-related crimes.
The extent of damage from cyber-related crimes grows each year. Every day, 56 billion junk emails are sent to computers which are hacked and become “zombie” computers. The social cost of such crimes is estimated to be 400 billion US dollars annually.
Based on "the Bright Internet," AIS will build a preventative Internet security system by adopting ground rules that make attackers responsible for the damages from such crimes. The system will also modify technology and other systems to minimize privacy infringement while maintaining security. Finally, the Bright Internet proposes to adopt an international standard for this security system through collaboration with the International Telecommunications Union (ITU).
Professor Lee said, “The vision of the Bright Internet started from an awareness that we needed to resolve issues such as Internet addiction, indiscriminate media exposure, and verbal violence. This vision developed by the experts from all around the world will not only bring a revolution of a reliable Internet platform to a global scale but also reshape the Korean Internet platform.”
2015.07.02 View 6788 -
KAIST Professor Sung-Ju Lee Appointed a Technical Program Chair of INFOCOM
Professor Sung-Ju Lee of the Department of Computer Science at KAIST has been appointed to serve as a technical program chair of IEEE INFOCOME. The computer communication conference, started in 1982, is influential in the research fields of the Internet, wireless, and data centers.
Professor Lee is the first Korean to serve as a program chair. He has been acknowledged for his work in network communications. In the 34th conference, which will be held next year, he will take part in selecting 650 experts in the field to become members and supervise the evaluation of around 1,600 papers.
Professor Lee is the leading researcher in the field of wireless mobile network systems. He is a fellow of the Institute of Electrical and Electronics Engineers (IEEE) and served as the general chair of the 20th Association for Computing Machinery (ACM) SIGMOBILE Annual International Conference on Mobile Computing & Networking (MobiCom 2014). He is on the editorial boards of IEEE Transactions on Mobile Computing (TMC) and IEEE Internet of Things Journals.
Professor Lee said, “I hope to continue the traditions of the conference, as well as integrating research from various areas of network communication. I will strive to create a program with high technology transfer probability.”
The 34th IEEE INFOCOM will take place in San Francisco in April 2016.
2015.07.02 View 7342 -
Professor Naehyuck Jang was Appointed Technical Program Chair of the Design Automation Conference
Professor Naehyuck Jang of the Electrical Engineering Department at KAIST was appointed as the technical program chair of the Design Automation Conference (DAC). He is the first Asian to serve the conference as the chair. At next year’s conference, he will select 150 program committee members and supervise the selection process of 1,000 papers.
Founded in 1964, DAC encompasses research related to automation of semiconductor processes, which usually involve billions of transistors. More than seven thousand people and 150 companies from all around the world participate, of which only the top 20% of the submitted papers are selected. It is the most prestigious conference in the field of semiconductor automation.
The Design Automation Conference also introduces optimization and automation of design processes of systems, hardware security, automobiles, and the Internet of things. Professor Jang specializes in low power system designs. As an ACM Distinguished Scientist, Professor Jang was elected as the chairman after contributing to this year’s program committee by reforming the process of selection of papers.
Professor Jang said, “This year’s conference represents a departure, where we move from the field of traditional semiconductors to the optimization of embedded system, the Internet of things, and security. He added that “we want to create a paper selection process that can propose the future of design automation.”
The 53rd annual DAC will take place at the Austin Convention Center in Texas in June 2016.
2015.07.02 View 5905 -
Professor Jinwoo Shin of the Electrical Engineering Department Receives the 2015 ACM SIGMETRICS Rising Star Research Award
Professor Jinwoo Shin of the Electrical Engineering Department at KAIST was selected as the recipient of the 2015 ACM SIGMETRICS Rising Star Research Award.
As a computer systems performance evaluation community, SIGMETRICS annually awards a junior researcher. He was selected as the 8th annual recipient, being the first from an Asian university.
Professor Shin was recognized for his work in theoretical analysis of stochastic queueing networks and machine learning. He said, “I would like to contribute to the expansion of computing and network theory in Korea wherein those fields are unrecognized.”
He has received numerous awards including Kennneth C. Sevcik (Best Student Paper) Award at SIGMETRICS 2009, George M. Sprowls (Best MIT CS PhD Thesis) Award 2010, Best Paper Award at MOBIHOC 2013, Best Publication Award from INFORMS Applied Probability Society 2013, and Bloomberg Scientific Research Award 2015.
2015.06.21 View 8296 -
Professor Jeong-Guon Ih Is Appointed the Vice President of the International Commission for Acoustics
Professor Jeong-Guon Ih of the Mechanical Engineering Department at KAIST has been elected to serve as the Vice President of the International Commission for Acoustics (ICA) from June 2015 to the end of 2016. The appointment was made at the meeting of the ICA Board held on June 1, 2015, in Maastricht, the Netherlands.
Professor Ih currently also chairs the Asia-Pacific Acoustics Commission.
Instituted in 1951, the ICA is an academic society that promotes international development and collaboration in all fields of acoustics including research, advancement, education, and standardization. It has a membership of 44 national acoustical societies worldwide and four observer countries.
2015.06.17 View 6077 -
Professor Sung Yong Kim Presents a Keynote Speech at the International Ocean Color Science Meeting (IOCS) 2015
Professor Sung Yong Kim of the Mechanical Engineering Department at KAIST delivered a keynote speech at the International Ocean Color Science Meeting (IOCS) 2015 held in San Francisco on June 15-18, 2015. His speech was entitled “Research and Applications Using Sub-mesoscale GOCI (Geostationary Ocean Color Imager) Data.”
The IOCS, organized by the International Ocean Color Coordinating Group (IOCCG), is a community consultation meeting providing communication and collaboration between space agencies and the ocean color community, building strong ties among international representatives of the ocean color communities, and providing a forum for discussion and the evolution of community thinking on a range of issues.
Professor Kim was recognized for his contribution towards the development of remote exploration of sub-mesoscale processes including eddies, fronts, and environmental fluid dynamics.
He also attended the 26th General Assembly of the International Union of Geodesy and Geophysics (IUGG) in Prague, the Czech Republic, on June 22, 2015 and gave a presentation on the sub-mesoscale eddies circulation research.
2015.06.12 View 7951 -
KAIST to Kick-Start the Exchange of Young Researchers with Northern European Universities
KAIST promotes research exchange and cooperation with three universities in Northern Europe.
KAIST has signed a letter of intent (LOI) for the mutual exchange of young researchers and cooperation to collaborate with KTH Royal Institute of Technology and Lund University, both based in Sweden on June 2, 2015, and with Aalto University in Finland on June 4, 2015.
This LOI was the result of the cooperative projects of Korea-Sweden and Korea-Finland Joint Committees on Science and Technology supervised by the Ministry of Science, ICT and Future Planning of Korea.
As agreed in the LOI, KAIST will conduct joint research projects with the three universities by providing students and researchers with opportunities to visit each other through internship programs and workshops and by sharing information on education and research.
Sung-Hyon Mayeng, the Associate Vice President of the International Relations Office at KAIST, said, “It’s an encouraging sign that universities and governments recognize the importance of increasing exchanges among academic and research communities. Expecting more vibrant relationships to be formed between KAIST and the three northern European universities in coming years, I hope that today’s agreement becomes a good basis to spur technological innovations that will not only benefit the regions but also the world.”
Established in 1827, the KTH Royal Institute of Technology is the largest and oldest technical university in Sweden, accounting for one-third of the nation’s technical research and engineering education capacity at university level. The university offers education and research programs from natural sciences to all branches of engineering including architecture, industrial management, and urban planning. According to the QS World University Rankings in 2014, KTH Royal Institute of Technology ranked 27th in engineering and 1st in Northern Europe.
Lund University, Sweden, is one of the oldest and most prestigious universities in northern Europe, consistently ranking among the world’s top 100 universities. In particular, its biological sciences and engineering have shown great strength, placing within the top 60 universities by the Times Higher Education (THE) World University Rankings. The university also receives the largest amount of research funding from the Swedish government.
Aalto University in Finland was created as a merger of three leading Finnish universities: the Helsinki University of Technology (established 1849), the Helsinki School of Economics (established 1904), and the University of Art and Design Helsinki (established 1871). The university nurtures the close collaborations across science, business, and arts to foster multi-disciplinary education and research.
2015.06.04 View 7359 -
The Acoustical Society of America Names Yang Hann Kim of KAIST the Recipient of the 2015 Rossing Prize in Acoustics Education
The award, given to Dr. Kim in recognition of his contributions to the advancement of acoustics education, will be presented during the 170th Meeting of the Acoustical Society of America on November 2-6, 2015 in Jacksonville, Florida.
The Acoustical Society of America (ASA) announced today that Professor Yang Hann Kim of the Mechanical Engineering Department at the Korea Advanced Institute of Science and Technology (KAIST) was the 12th recipient of the Rossing Prize in Acoustics Education. Dr. Kim is the first recipient selected from a non-English-speaking nation.
The Rossing Prize in Acoustics Education was established in 2003 from a generous gift made to the ASA Foundation by Thomas D. Rossing to recognize an individual who has made significant contributions to the advancement of acoustics education through distinguished teaching, creation of educational materials, textbook writing, and other activities.
During 25 years of teaching and conducting research in acoustics, noise, and vibration at KAIST, Dr. Kim has advised 26 doctorates and published over 200 research papers in journals such as Journal of Acoustical Society of America, Journal of Sound and Vibration, and Journal of Mechanical Systems and Signal Processing. He also wrote two acoustics textbooks for university education, which has been widely read worldwide. The textbook titles are: Sound Propagation: An Impedance Based Approach (Wiley, July 2010) and with the co-author, Dr. Jung-Woo Choi, Sound Visualization and Manipulation (Wiley, September 2013).
Since 2009, Professor Kim has lectured an online course entitled “Introduction to Acoustics,” offering students and the general public throughout the world guidance to study acoustics through the basic concept of impedance, for example, on vibrations and waves.
Dr. Kim will receive the award during ASA’s 170th conference to be held on November 2-6, 2015 at the Hyatt Regency Jacksonville Riverfront Hotel in Jacksonville, Florida, USA.
For the list of previous recipients of the Rossing Prize in Acoustics Education,
see:http://acousticalsociety.org/funding_resources/prizes#rossing
2015.06.04 View 7797 -
BBC Feautres KAIST's Jellyfish Robot
Click, a weekly BBC television program covering news and recent developments in science and technology, introduced KAIST’s robotics project, JEROS, which has been conducted by Professor Hyun Myung of the Urban Robotics Lab (http://urobot.kaist.ac.kr/). JEROS is a robotics system that detects, captures, and removes jellyfish in the ocean. For the show, please click the link below:
BBC News, Click, June 2, 2015
The Robot Jellyfish Shredders
http://www.bbc.com/news/technology-32965841
2015.06.03 View 8833 -
KAIST to Host Conference on the Financial Technology Industry
To take place in the Korea Federation of Banks building on May 21, 2015, Seoul
Around 200 individuals to be present including Oh-Kyu Kwon, the former Minister of Finance and Economy and Chang-Hyun Yun, the former president of Korea Institute of Finance
KAIST will hold a conference to discuss prospects for Korea’s financial technology industry (FinTech) and to address the rapid changes taking place in both national and global finance markets.
The conference will be held in the Convention Hall of the Korea Federation of Banks building in Myeongdong, Seoul on May 21, 2015 with a theme entitled “The Challenge and the Task of Korean FinTech Industry in the Global Finance Market.”
Around 200 individuals including Oh-Kyu Kwon, the former Minister of Finance and Economy, Jiwon Jung, a member of a standing committee of Financial Services Commission, and Steve Kang, the President of KAIST will attend the meeting.
The term “FinTech” originates from the combination of two words, finance and technology, to describe a new form of financial system based on Information Technology (IT). The precise definition and boundary of FinTech is not fully established yet, but this will provide Korea with an opportunity to take the lead in the finance industry with its cutting-edge IT.
The conference will focus on the methods by which Korean FinTech companies can acquire a competitive edge in the global finance market. The keynote speaker, Tong-Suk Kim, the Dean of College of Business, KAIST, will speak about “The Challenge and the Task of Korean FinTech.” The talk will emphasize how the FinTech industry can create an innovative industry, destroying the existing paradigm of payment system and Internet-only banks.
The keynote speech will be followed by a talk on “The Requirements for Establishing Korean FinTech Ecosystem” by Jong-Hyun Kim, a researcher at Woori Finance Research Institute, Korea.
Additional talks, which will be given by KAIST professors, are:
“Korean Economy and the Role of FinTech” by Professor Young-Sun Kwon of the Department Business and Technology Management;
“Korean FinTech in ICT Perspective” by Professor Yoon-Joon Lee of the Department of Computer Science;
“The Current State and Possibilities of Korean FinTech” by Professor Byung-Tae Lee of the School of Management Engineering; and
“The Task and Challenge of Promoting FinTech Industry” by Professor Byung-Chun Kim of the School of Management Engineering.
Also, Professor Chang-Hyun Yoon of the School of Business Administration, University of Seoul, will give a talk on “The Crisis in Korean Finance Industry and the Role of FinTech.”
The conference will also hold a discussion session on “The Promotion Methods for Korean FinTech Industry.” Participants for the discussion will include Jae-Sung Song from the Ministry of Science, ICT and Future Planning, Dong-Hwan Kim from the Financial Services Commission, Jeon Jin from Samsung Economic Research Institute (SERI), Hyo-Jin Lee of 8Percent, In-Chang Hwang from the Korea Insurance Research Institute, and Jae-Kyu Lee from Koscom.
Byung-Chun Kim, the Director of KAIST’s Financial Engineering Research Center, who organized the FinTech conference said, “FinTech industry will evolve from simply attempting to attract consumers to understanding the lifestyle patterns of consumers to provide customized service and information.”
2015.05.20 View 8377