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Wireless power transfer achieved at 5-meter distance
With a maximum output power of 209 W at 20 kHz, the Dipole Coil Resonant System can charge 40 smart phones simultaneously, even if the power source is 5 meters away. The way electronic devices receive their power has changed tremendously over the past few decades, from wired to non-wired. Users today enjoy all kinds of wireless electronic gadgets including cell phones, mobile displays, tablet PCs, and even batteries. The Internet has also shifted from wired to wireless. Now, researchers and engineers are trying to remove the last remaining wires altogether by developing wireless power transfer technology. Chun T. Rim, a professor of Nuclear & Quantum Engineering at KAIST, and his team showcased, on April 16, 2014 at the KAIST campus, Daejeon, Republic of Korea, a great improvement in the distance that electric power can travel wirelessly. They developed the "Dipole Coil Resonant System (DCRS)" for an extended range of inductive power transfer, up to 5 meters between transmitter and receiver coils. Since MIT's (Massachusetts Institute of Technology) introduction of the Coupled Magnetic Resonance System (CMRS) in 2007, which used a magnetic field to transfer energy for a distance of 2.1 meters, the development of long-distance wireless power transfer has attracted much attention for further research. However, in terms of extending the distance of wireless power, CMRS, for example, has revealed technical limitations to commercialization that are yet to be solved: a rather complicated coil structure (composed of four coils for input, transmission, reception, and load); bulky-size resonant coils; high frequency (in a range of 10 MHz) required to resonate the transmitter and receiver coils, which results in low transfer efficiency; and a high Q factor of 2,000 that makes the resonant coils very sensitive to surroundings such as temperature, humidity, and human proximity. Professor Rim proposed a meaningful solution to these problems through DCRS, an optimally designed coil structure that has two magnetic dipole coils, a primary one to induce a magnetic field and a secondary to receive electric power. Unlike the large and thick loop-shaped air coils built in CMRS, the KAIST research team used compact ferrite core rods with windings at their centers. The high frequency AC current of the primary winding generates a magnetic field, and then the linkage magnetic flux induces the voltage at the secondary winding. Scalable and slim with a size of 3 m in length, 10 cm in width, and 20 cm in height, DCRS is significantly smaller than CMRS. The system has a low Q factor of 100, showing 20 times stronger against the environment changes, and works well at a low frequency of 100 kHz. The team conducted several experiments and achieved promising results: for instance, under the operation of 20 kHz, the maximum output power was 1,403 W at a 3-meter distance, 471 W at 4-meter, and 209 W at 5-meter. For 100 W of electric power transfer, the overall system power efficiency was 36.9% at 3 meters, 18.7% at 4 meters, and 9.2% at 5 meters."With DCRS," Professor Rim said, "a large LED TV as well as three 40 W-fans can be powered from a 5-meter distance." "Our technology proved the possibility of a new remote power delivery mechanism that has never been tried at such a long distance. Although the long-range wireless power transfer is still in an early stage of commercialization and quite costly to implement, we believe that this is the right direction for electric power to be supplied in the future. Just like we see Wi-Fi zones everywhere today, we will eventually have many Wi-Power zones at such places as restaurants and streets that provide electric power wirelessly to electronic devices. We will use all the devices anywhere without tangled wires attached and anytime without worrying about charging their batteries." Professor Rim's team completed a research project with the Korea Hydro & Nuclear Power Co., Ltd in March this year to remotely supply electric power to essential instrumentation and control equipment at a nuclear power plant in order to properly respond to an emergency like the one happened at the Fukushima Daiichi nuclear plant. They succeeded to transfer 10 W of electricity to the plant that was located 7 meters away from the power base. The research result was published in the March 2014 issue of IEEE Transactions on Power Electronics. Youtube link: http://www.youtube.com/watch?v=R6UCwqjdpo0&list=UUirZA3OFhxP4YFreIJkTtXw [Picture Captions] Picture 1: A prototype of the Dipole Coil Resonant System (DCRS), developed by a KAIST research team, turns a LED television on at a 5-meter distance. Picture 2: Overall configuration of DCRS, showing primary and secondary coils Picture 3: Simulation result of magnetic flux lines of DCRS coil configuration
Tae-Wan Kim, a doctoral candidate, receives the best paper award from ECTC
The 2014 Electronic Components and Technology Conference (ECTC) will take place on May 27-30 in Florida, USA. Tae-Wan Kim, a Ph.D. candidate at the Department of Materials Science Engineering (MSE), KAIST, will receive the Intel Best Student Paper Award at the conference.ECTC is the premier international conference that brings together the best researchers and engineers in packaging, components and microelectronic systems science, technology and education in an environment of cooperation and technical exchange. The conference is sponsored by the Components, Packaging and Manufacturing Technology (CPMT) Society of IEEE (Institute of Electrical and Electronics Engineering).The paper describes research on novel nanofiber anisotropic conductive films for ultra fine pitch electronic package application, which was written under the guidance of Professor Kyung-Wook Paik of the MSE Department. In the past ten years, two of his students have received the best paper award from ECTC.
Is it possible to identify rumors on SNS?
Rumors sporadically spread with people with fewer followers in the centerResearched over 100 rumors in the US from 2006 to 2009 Is it possible to filter information on SNS such as Twitter and Facebook? A research team led by Professor Mee-Young Cha from the Department of Cultural Technology Graduate School at KAIST, Professor Kyo-Min Jung of Seoul National University, Doctor Wei Chen and Yajun Wang of Microsoft Asia, has developed a technology that can accurately filter out information on Twitter to 90% accuracy. The research not only deduced a new mathematical model, network structure, and linguistic characteristics on rumors from SNS data, but is also expected to enhance the effort to make secure technology to regulate Internet rumors. The team analysed the characteristics of rumors in over 100 widespread cases in the US from 2006 to 2009 on Twitter. The team gathered data, which included a range of areas such as politics, IT, health and celebrity gossips, and their analysis could identify rumors to 90% accuracy. The filtering was more accurate in rumors that included slanders or insults. The research team identified three characteristics of the spread of rumors. Firstly, rumors spread continuously. Normal news spreads widely once and is mentioned rarely again on media, but rumors tend to continue for years. Secondly, rumors spread through sporadic participation of random users with no connections. Rumors start from people with fewer followers and spread to the more popular. This phenomenon is often observed in rumors concerning celebrities or politicians. Lastly, rumors have unique linguistic characteristics. Rumors frequently include words (such as “it may be true,” “although not certain, I think,” “although I cannot fully remember”) related to psychological processes that question, deny, or infer the reliability of the information. Professor Cha said, “This research deduced not only a statistical and mathematical model but also is an integrated research on social psychological theory on the characteristics of rumors that attract great attention from the society based on ample data.” The results were made public in IEEE International Conference on Data Mining last December in Texas, USA.
Hyun-Sik Kim, KAIST doctoral student, receives Predoctoral Achievement Award from IEEE Solid-State Circuits Society
Hyun-Sik Kim, a Ph.D. student from the Department of Electrical Engineering, is scheduled to receive the “Predoctoral Achievement Award” from the Institute of Electrical and Electronics Engineers (IEEE) Solid-State Circuit Society (SSCS) at its 2014 annual conference to be held on February 9-13 in San Francisco, USA. Kim, the first Korean student receiving the award, will also be given a 1,000 USD honorarium. Established in 1983, the Predoctoral Achievement Award has been given to a small number of promising graduate students, which is made on the basis of academic record and potential, quality of publications, and a graduate study program well matched to the charter of SSCS. Among the previous recipients were Professor Bernhard Boser of the University of California in Berkeley and Professor Michael Flynn of Michigan University. Kim published 15 research papers in international journals and conferences, applied for 35 domestic and international patents, and received the best paper award in human technology from Samsun Electronics for three consecutive years. Professor Kyu-Hyung Cho of Electrical Engineering is Kim's principal advisor.
Professor Kwy-Ro Lee Appointed Distinguished Member of IEEE
Professor Kwy-Ro Lee from the Department of Electrical Engineering at KAIST was selected as a distinguished member of the Institute of Electrical and Electronics Engineers (IEEE) where his contribution to research development of the technological management of semiconductors was recognized. Professor Lee earned his BS from Seoul National University and MS & Ph.D. from the University of Minnesota. He has been working as a professor in the Department of Electrical Engineering since 1986. He has also served as the president of the LG Electronics Research Center in 2005 and the president of the Nanoscience and Technology Center at KAIST in 2010. IEEE is the largest professional association for the advancement of technology in electrical, electronics, computing and communication with 400,000 members in 160 countries. Only 0.1 percent of members with over ten years of service can be selected as distinguished members based on their research devotion for society.
Professor Chun-Taek Rim Appointed as Associate Editor for IEEE TPEL
Professor Chun-Taek Rim of the nuclear and quantum engineering at KAIST was appointed as an associate editor of the Institute of Electrical and Electronics Engineers (IEEE) Transactions on Power Electronics (TPEL), an eminent academic journal bio-monthly published in the field of power electronics.The journal has a high impact factor (4.08), a measure reflecting the average number of citations to recent articles published in an academic journal, which ranks as the 6th the most influential journal among the 100 journals published by IEEE.Professor Rim was also appointed to an associate editor for IEEE Journal of Emerging and Selected Topics in Power Electronics in September in recognition of his expertise in wireless power and electric vehicles.
Prof. Song Chong received the IEEE William R. Bennett Prize Paper Award
The IEEE (Institute of Electrical and Electronics Engineers) Communications Society (ComSoc), a renowned global network of professionals with a common interest in advancing communications technologies, has announced the winner of the 2013 William R. Bennett Prize in the field of communications networking. The prize was given to a Korean research team led by Song Chong, Professor of Electrical Engineering at KAIST and Injong Rhee, Professor of Computer Science at North Carolina State University. In addition, Dr. Minsu Shin, Dr. Seongik Hong, and Dr. Seong Joon Kim of Samsung Electronics Co., Ltd. as well as Professor Kyunghan Lee from Ulsan National Institute of Science and Technology were recognized for their contribution. The William R. Bennett Prize for communications networking has been awarded each year since 1994 in recognition of the best paper published in any journal financially sponsored or co-sponsored by ComSoc in the previous three calendar years. Only one paper per year is selected based on its quality, originality, scientific citation index, and peer reviews. Among the previous award winners are Robert Gallager of MIT, and Steven Low of the California Institute of Technology, and Kang G. Shin of the University of Michigan. The Korean research team’s paper, On the Levy-Walk Nature of Human Mobility, was published in the June 2011 issue of IEEE/ACM Transactions on Networking, a bimonthly journal co-sponsored by the IEEE ComSoc, the IEEE Computer Society, and the Association for Computing Machinery (ACM) with its Special Interest Group on Data Communications (SIGCOMM). In the paper, the research team proposed a new statistical model to effectively analyze the pattern of individual human mobility in daily life. The team handed out GPS (global positioning system) devices to 100 participants residing in five different university campuses in Korea and the US and collected data on their movements for 226 days. The mobility pattern obtained from the experiment predicted accurately how the participants actually moved around during their routines. Since publication, the paper has been cited by other papers approximately 350 times. The team’s research results will apply to many fields such as the prevention and control of epidemics, the design of efficient communications networks, and the development of urban and transportation system. The research team received the award on June 10th at the 2013 IEEE International Conference on Communications (ICC) held in Budapest, Hungary, from June 9-13, 2013. Professor Song Chong
Prof. Jong Chul Ye Appointed as the Editor of IEEE TIP
Professor Jong Chul Ye KAIST Bio & brain engineering department’s Professor Jong Chul Ye has been appointed as the editor of the "IEEE image processing transactions (IEEE TIP, IEEE Transaction on Image Processing)’, a prominent journal in the sector of imaging and medical image processing. Professor Ye will act as the editor in the field of medical imaging from February 2013 to January 2016, during which he will participate in examining thesis, establishing the direction of the journal and more. Professor Jong Chul Ye was recognized for his notable work in the field of medical imaging research using compressed sensing for the development of a high resolution medical image reconstruction techniques. This technique has pioneered a new area that is applicable in magnetic resonance imaging (MRI), computed tomography (CT), positron emission Camcorder (PET) and brain imaging. On the other hand, “IEEE TIP” was first published in 1992 and is currently the world’s leading authority in the field of image processing, medical imaging, image acquisition, compression and output.
Professor Shin In Shik First in Asia to receive Excellent Dissertation Award from IEEE RTSS
The research team lead by Professor Shin In Shik (Department of Computer Science) received the Excellent Dissertation Awardy in the IEEE RTSS out of 157 dissertations. It is the first time a Professor under an institute in the Asia region received the Award in the RTSS field during its 33 year history. Professor Shin had already received an Excellent Dissertation Award as a Ph.D. candidate at the University of Pennsylvania. Thus Professor Shin became the first and only scientist to receive the Award twice. Professor Shin has successfully defined the scheduling method of the multicore processor which was regarded as the problem in the field of RTSS for the past decade. Professor Shin has suggested new criteria for sorting real time tasks in parallel thereby suggesting a new scheduling method that surpasses current scheduling methods. The results are anticipated to provide new perspectives in the field of RTSS using multicore processors.
Professor Hwang Gyu Young Elected as Chairman of IEEE TCDE.
Professor Hwang Gyu Young (Department of Computer Science) was elected as the Chairman of IEEE (Institute of Electrical and Electronics Engineers) TCDE (Technical Committee on Data Engineering). IEEE TCDE is one of the three academic organizations (including VLDB Endowment, ACM SIGMOD) and Professor Hwang is the first to be elected as Chairman from the Asia-Pacific region. Professor Hwang’s tenure begins on New Year’s Day for two years. IEEE TCDE holds the world’s most prestigious academic competition IEEE ICDE and hosts the Working Group and publishes the IEEE Data Engineering Bulletin.
New wireless charging device developed
The On-line Electric Vehicle (OLEV) developed by KAIST has made a step towards commercialization with the development of a more economic wireless charging device. Professor Chun-Taek Rim from the Department of Nuclear and Quantum Engineering at KAIST has developed a new I-shaped wireless charging device that differs from the pre-existing rail-type electricity feeder. This device can be modularly produced and requires relatively less construction, significantly reducing the cost of implementation. The KAIST OLEV is a new concept electric car that has a special electricity collecting device underneath it. The car’s battery is charged by magnetic fields produced from electric lines buried 15cm underneath the road. The vehicle was first tested in 2009, making it the first wireless electric car in the world. OLEV can be charged during stoppage time between traffic lights and receives real-time power when running. OLEV is currently in operation at the KAIST Munji Campus in Daejeon and is also being exhibited at the Yeosu Expo and Seoul Grand Park. The device itself has a charging capacity of 15kW, and the electricity is supplied through an electricity feeder with a width of 80cm with a space interval of 20cm. Despite being hailed as a technological breakthrough and revolutionary concept, KAIST OLEV has been criticized for problems in commercialization, due to the difficulties in installing wires beneath existing roads, which costs a considerable amount of money. The new I-shaped wireless charging device reduces the width of the electricity feeder by 10cm, a mere one-eighth of the size of the previous version, and greatly increases the charging power to 25kW. Furthermore, the left and right permissible space of automobiles has increased to 24cm and the magnetic field complies with the international design guidelines, making the OLEV safe for the human body. The reduction of the width has made the mass production of modules possible, making the installation of KAIST OLEV more economical and marketable. Professor Rim emphasized that compared with the existing rail-type electricity feeder, the new technology will need only one-tenth of the construction time and 80% of the cost, significantly improving OLEV’s constructability and workability. The research was published in the IEEE Transactions on Power Electronics last December, and Professor Rim was invited to talk at the Conference on Electric Roads & Vehicles, which was held in February in the United States, about the new technology.
The 9th International Conference on Entertainment Computing Held, Sep 8-11, 2010
The cyber world is no longer an unrealistic place for a contemporary man who spends most of his time in front of a computer nowadays. The entertainment contents industry, which materializes the cyber world, leads the new knowledge economy and is emerging as a new growth engine for high value-added industry. Professionals in entertainment computing gathered to discuss how to make the cyber space more elaborate and entertaining. The 9th 2010 International Conference on Entertainment Computing (ICEC) was held from September 8 to September 11 at Seoul COEX by KAIST and International Federation for Information Processing (IFIP). This year’s theme is “Creative and Innovative Science, Computing and Design for Digital and Entertainment Contents in 21C”, with fifteen global leaders of industry-university-institute collaboration speakers including George Joblove (Executive VP of Sony Pictures Technologies), Massimiliano Gasparri (VP of Warner Bros. Advanced Digital Services), Don Marinelli (Executive Producer of Entertainment Technology Center at University of Carnegie Mellon), Keith Devlin (Founding Executive Director of Stanford Media-X and Executive Director of Stanford H-STAR), Roy Ascott (President of Planetary Collegium). Speeches, paper sessions, workshops, exhibitions on the high-tech digital entertainment industry including computer graphics, cyber reality, telepresence, 3D/4D, mobile games, animation, special effects, robot design, content production and distribution, media art were held at the conference this year. This event was sponsored by IEEE, ACM, IPS, ADADA, Elsevier, ETRI, SK Telecom, KIISE, KMMS, HCI Korea, KCGS and KCGS.
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