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Prof. Jang-Uk Choi develops Strong, Long-lasting Lithium-ion Battery
Lithium-ion secondary battery with high power, as well asmuch longer life span, has been developed using nanotechnology. Professor Jang-Uk Choi and his colleagues at KAIST University EEWS graduate school has succeeded in developing a new lithium-ion secondary battery that has more than five times the output and three times the life span of the conventional batteries. The industry expects the new battery to significantly improve the acceleration performance and solve the drawbacks of slow electric cars, which occurred due to failure of battery performance to keep up with the output of the motors during acceleration. It is also expected that the new battery could be utilized in various fields that require high power batteries such as Smart Grid, which is the next generation intelligent electrical grid, as well as electric tools and many others. Currently, the most widely used commercial lithium ion batteries’ lithium-cobalt-based cathode material has the disadvantage of expensive cost, high toxicity, short life expectancy and long-charge/discharge time. Also, it has been difficult to apply in electric cars that require a large current density and are vulnerable to heat generated during charging/discharging. On the other hand, Professor Choi and his colleagues’ lithium-manganese based cathode material is gaining popularity for having the advantages such as abundant raw materials, cheap prices, eco-friendliness and especially excellent high-temperature stability and high output, which are suitable for use as electrode material in electric cars. The pure lithium manganese based cathode material has a critical drawback of a very short life expectancy, only lasting about average of 1-2 years, which is due to the elution when the melted manganese flows out into the electrolyte. There have been various studies to solve this problem; however, the unique crystal structure of the material remained as a challenge for many scientists. Professor Choi’s team analyzed the structure of the crystal at the time shortly before manganese oxides were formed, while controlling the reaction temperature at the step of synthesizing nanomaterial. It has been found that, at 220℃, there are simultaneously existing two crystal faces, one that inhibits the dissolution of manganese ions and the other that enables lithium ions to move smoothly. Each of these crystal faces improves both the life span and output, increasing the output more than five times and life expectancy over three times. In addition, the existing high temperature life span, that was known to be especially vulnerable, has improved ten-fold. “By controlling the crystal face of lithium manganese anode material, which has previously existed in the battery as chunks of about 10 micro-meter particles, both output and life span has significantly improved,” said Professor Choi, “Domestic and international patent application for the regarding technology has been finished and we have plans to work with companies in the future for commercialization within 2-3 years.” Professor Yi Cui of Stanford University, the world’s leading scholar on the secondary battery, has evaluated that “This research exemplifies how nanotechnology can innovatively develop the field of secondary battery.” Meanwhile, the research led by Professor Jang-Uk Choi and participated by researcher Ju-Seong Kim has been published on the online edition (dated Nov 27th) of Nanoletters, the world’s leading authority on Nanoscience.
2012.12.21
View 8646
Technology that will allow household scale position tracking of smartphones indoors, where GPS signals do not reach, has been developed. It is anticipated that the newly developed technology will enable the tracking of persons indoors in an emergency situ
Technology that will allow household scale position tracking of smartphones indoors, where GPS signals do not reach, has been developed. It is anticipated that the newly developed technology will enable the tracking of persons indoors in an emergency situation or aid in the finding of a lost smartphone. Professor Han Dong Soo (Department of Computer Sciences) and his research team has developed the technology that enables tracking a smartphone’s location indoors using wireless LAN signals accurate to 10 meters. Because the technology utilizes wireless LAN signals and the address of smartphone users, the technology can be implemented for a low cost all over the world. Conventionally the location of a lost smartphone can be found through a telecommunications company. However the location found using the base station is only accurate to 500m~700m and therefore reclaiming lost smartphones is nearly impossible. In addition, there have been unfortunate events where the kidnapped victim called the police but was murdered due to the inaccuracy of smartphone location tracking. The newly developed technology by Professor Han’s team remedies the inaccuracy of smartphone location tracking. Professor Han’s team collected wireless LAN data recorded in the smartphones for a week to analyze the patterns to distinguish patterns between signals recorded in the workplace and in the household. The stability and accuracy of the technology was verified over a period of five months in various locations across Korea with varying population densities. The result was when the total amount of data collected passes 50% of the number of households, the technology show accuracy to 10 meters. The result showed that the new technology can track the location of the smartphone to 10 meters on a household scale. In addition it was possible to distinguish which floor the smartphone was located. The technology is anticipated to improve smartphone positioning. However caution needs to be practiced as the technology requires the address of the user’s workplace and home.
2012.12.21
View 8359
Household Scale Indoor Position Tracking Technology Developed
Technology that will allow household scale position tracking of smartphones indoors, where GPS signals do not reach, has been developed. It is anticipated that the newly developed technology will enable the tracking of persons indoors in an emergency situation or aid in the finding of a lost smartphone. Professor Han Dong Soo (Department of Computer Sciences) and his research team has developed the technology that enables tracking a smartphone’s location indoors using wireless LAN signals accurate to 10 meters. Because the technology utilizes wireless LAN signals and the address of smartphone users, the technology can be implemented for a low cost all over the world. Conventionally the location of a lost smartphone can be found through a telecommunications company. However the location found using the base station is only accurate to 500m~700m and therefore reclaiming lost smartphones is nearly impossible. In addition, there have been unfortunate events where the kidnapped victim called the police but was murdered due to the inaccuracy of smartphone location tracking. The newly developed technology by Professor Han’s team remedies the inaccuracy of smartphone location tracking. Professor Han’s team collected wireless LAN data recorded in the smartphones for a week to analyze the patterns to distinguish patterns between signals recorded in the workplace and in the household. The stability and accuracy of the technology was verified over a period of five months in various locations across Korea with varying population densities. The result was when the total amount of data collected passes 50% of the number of households, the technology show accuracy to 10 meters. The result showed that the new technology can track the location of the smartphone to 10 meters on a household scale. In addition it was possible to distinguish which floor the smartphone was located. The technology is anticipated to improve smartphone positioning. However caution needs to be practiced as the technology requires the address of the user’s workplace and home.
2012.12.21
View 7480
KAIST International Students Organize KAIST ONE Program
International Students at KAIST are running a program called “KAIST ONE” (Overseas Networking Exchange) in order to promote an active exchange between students and to present their cultures. Originally an international cultural activity at the ICU (then the Information and Communications University) in 2007, the program changed its name to “KAIST ONE” and was continued after the merging of the university with KAIST. Students of about 40 different countries have participated to date, and each annual event attracts more than 150 students. Over 700 international students from 70 different countries around the world spontaneously organize and manage the KAIST ONE program, which is run five times this semester, every other Thursday from 7p.m. to 9p.m. at the KAIST International Center. The 11th of last month and the 1st of this month witnessed an enthusiastic response from about 150 participants who joined the Columbian and the Saudi Arabian students in introducing their cultures, presenting traditional cultural performances, and sharing traditional foods. The next in line are Danish, Ugandan, and Cameroonian students who are set to have their turns on this month’s 15th, 29th, and next month’s 6th, respectively. Also notable is the active attention and support from foreign embassies such as the participation of Tunisian, Brazilian, Pakistani, Azerbaijani, Thai, and German ambassadors in the program since last year to provide food and introductory guides to cultures. The director of this year’s program, Karim Charfi (Tunisian, 3rd year Electrical Engineering) said, “During the selection stage of each semester, everyone competes for the chance to present their country,” and “KAIST ONE has established itself as a unique and exotic cultural event at KAIST since it networks about 40 of the relatively less known countries such as Uganda, Cameroon, Tunisia, and Chile and the people with diverse cultures.” The supervisor of the program, Chang Dong Yoo of the Office of Special Projects and Institutional Relations said, “KAIST ONE is an opportunity for international students to acquaint people with their cultures, and it is also a site of cultural exchange and of building friendships among KAIST students and international students,” and “we plan to extend the event such that not only the KAIST members but also the local residents can join in.” The program welcomes KAIST students as well as the general public.
2012.12.21
View 7250
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.
2012.12.21
View 8428
Ph.D. students Hyowon Park and Won Ma receive Grand Prizes in Mathematics and Biology respectively.
Researchers in KAIST received best paper awards in two out of three fields at this year’s award ceremony for the “Second Annual Best Thesis Paper Award” held collectively by the Korea University Presidents’ Federation (with Chairman DaeSoon Lee) and the Korean Academy of Science and Technology (with Director GilSang Jung). Two researchers from KAIST, Hyowon Park (Department of Mathematics) and Won Ma (Department of Biology) received best paper awards. This prize, given by the both the Korea University Presidents’ Federation and the Korean Academy of Science and Technology since last year, is awarded to researchers and assistant professors who write the most outstanding thesis papers in the field of basic sciences. Park, who received the best paper award this year, did research on graph braid groups. He was supervised by Professor Kihyung Ko, who received the best supervisor reward. Ma, who received the best paper award in the field of biological science, researched about the Attention Deficit/Hyperactivity Disorder due to deficiency of the GIT1 synapse protein. His supervising professor also received the supervisor award. The award ceremony was held in the auditorium of the S-OIL headquarters in Seoul on November 30. Meanwhile, NASA researcher Jaehwa Lee received the best paper award in the field of earth science, and his supervising professor, Professor Jun Kim from Yonsei University who studies atmospheric science, received the best supervisor award.
2012.12.21
View 9373
KAIST to be Nominated as the Top 100 Innovators
A total of 7 South Korean universities, research institutes, and corporates, including KAIST, POSTECH, and Korean Research Institute of Chemical Technology, have been selected as the 2012 Top 100 Global Innovative Organizations. In particular, universities were part of the list for the first time in 2012, with two South Korean universities, KAIST and POSTECH, being the only entities representing their category. Thomson Reuters, the world"s leading media and financial-data firm, has announced a report entitled "2012 Thomson Reuters Top 100 Global Innovative Organizations", which includes KAIST and 6 other South Korean institutes, corporates, and universities. Thomson Reuters has been publishing an annual report since last year that selects the Top 100 Global Innovative Organizations by analyzing quantitative and qualitative data through original methods and criteria such as ▲the ratio of published patent applications to granted patents, ▲the number of innovative patents that have quadrilateral patents in their patent families, ▲the number of citations to each organizations" patents, excluding self-citations, and ▲the generation of a sizable amount of innovation. According to the most recent report, 47 American corporates and 21 European corporates have been selected as the Top 100 Global Innovative Organizations. Japan was the leading nation in the continent of Asia with 25 listed corporates, while 7 corporates, research institutes, and universities, including KAIST, have been selected from South Korea. Besides, POSTECH, Korea Research Institute of Science and Technology, Korea Electronics Technology Institute, LSIS, LG Electronics, and Samsung Electronics were the 6 other South Korean organizations that are included in the list. Doo Won-soo, chief of Public Relations Department of KAIST, said "Thomson Reuter"s selection of innovative organizations demonstrates that KAIST is an organization that puts great efforts for the development of advanced technologies and innovative research," also reminding that KAIST earned the 5th position by World Intellectual Property Organization (WIPO), an agency of the United Nations, among universities worldwide with applications for international patents. Meanwhile, Thomson Reuters is the world"s leading media and financial-data firm that offers valuable intelligent information to CEO"s and experts in the vast fields of finance, banking, legislation, taxation, accounting, intellectual properties, science, and media. Reports from Thomson Reuters are also accounted in the assessment of Times Higher Educations (THE), the British organization for world university rankings. The head office of Thomson Reuters is currently in New York, USA, with a total of 60,000 employees working overseas.
2012.12.21
View 8285
The control of light at the nano-level
Professor Min Bumki Professor Min Bumki’s research team from the Department of Mechanical Engineering at KAIST have successfully gained control of the transmittance of light in optical devices using graphene* and artificial 2-dimensional metamaterials**. * Graphene : a thin membrane composed of pure carbon, with atoms arranged in a regular hexagonal pattern ** Metamaterials : artificial materials engineered to have properties that may not be found in nature The research results were published in the recent online edition (September 30th) of Nature Materials, a sister journal of the world renowned Nature journal, under the title ‘Terahertz waves with gate-controlled active graphene metamaterials’ Since the discovery of graphene in 2004 by Professors Novoselov and Geim from the University of Manchester (2010 Nobel Prize winners in Physics), it has been dubbed “the dream material” because of its outstanding physical properties. Graphene has been especially praised for its ability to absorb approximately 2.3% of near infrared and visible rays due to its characteristic electron structure. This property allows graphene to be used as a transparent electrode, which is a vital electrical component used in touch screens and solar batteries. However, graphene’s optical transmittance was largely ignored by researchers due to its limited control using electrical methods and its small optical modulation in data transfer. Professor Min’s team combined 0.34 nanometer-thick graphene with metamaterials to allow a more effective control of light transmittance and greater optical modulation. This graphene metamaterial can be integrated in to a thin and flexible macromolecule substrate which allows the control of transmittance using electric signals. This research experimentally showed that graphene metamaterials can not only effective control optical transmittance, but can also be used in graphene optical memory devices using electrical hysteresis. Professor Min said that “this research allows the effective control of light at the nanometer level” and that “this research will help in the development of microscopic optical modulators or memory disks”. figure 1. The working drawing of graphene metamaterials figure 2. Conceptual diagram (Left) and microscopic photo (right) of graphene metamaterials
2012.11.23
View 9797
Education 3.0: a change from teaching to learning
On October 16th, educationalists and Presidents from research-oriented universities around the world gathered in Seoul to attend the 2012 International Presidential Forum on Global Research Universities, where KAIST introduced its new smart learning model ‘Education 3.0’. Smart learning ‘Education 3.0’ allows students to learn from lectures given by renowned scholars through the internet and encouraged student to professor discussion. This technology was created to deal with the ever-changing classroom dynamics due to the advancement of IT technology.‘Education 3.0’ differs from the traditional teaching-based lectures in that it offers a platform for self-directed learning. KAIST is working to spread ‘Education 3.0’ by providing specialized classrooms and running an online learning platform that complements it. This spring, KAIST adopted ‘Education 3.0’ in 3 courses and received high praise from students (a rating of 4.4 out of 5.0). Hence, the number of courses was extended to 10 this fall. Through this gathering, KAIST hopes to develop cooperative connections between foreign universities to share learning platforms and contents. On October 16th, KAIST signed a MOU with Denmark’s Danmarks Tekniske Universitet (DTU) to provide a cyber-dual degree program using ‘Education 3.0’. Hence, students studying Web science and Digital Media in either KAIST or DTU can receive degrees from both schools without physically visiting them. President Suh said that “‘Education 3.0’ provides a new paradigm of learning which moves from the tradition cramming method of teaching to self-directed learning” and that this model will help the globalization of KAIST by initiating global cooperation with foreign universities. Over 60 Universities from 27 different countries attended the forum, including ULCA and Caltech from the United States, DTU from Denmark, University of Southampton and University of York from England, University of Queensland from Australia, Nanyang Technological University from Singapore and Tokyo Institute of Technology from Japan. Members from Korean Universities such as Hanyang University, Handong Global University, Sogang University and Sookmyung Women"s University also attended.
2012.10.25
View 9420
3D contents using our technology
Professor Noh Jun Yong’s research team from KAIST Graduate School of Culture Technology has successfully developed a software program that improves the semiautomatic conversation rate efficiency of 3D stereoscopic images by 3 times. This software, named ‘NAKiD’, was first presented at the renowned Computer Graphics conference/exhibition ‘Siggraph 2012’ in August and received intense interest from the participants. The ‘NAKiD’ technology is forecasted to replace the expensive imported equipment and technology used in 3D filming. For multi-viewpoint no-glasses 3D stereopsis, two cameras are needed to film the image. However, ‘NAKiD’ can easily convert images from a single camera into a 3D image, greatly decreasing the problems in the film production process as well as its cost. There are 2 methods commonly used in the production of 3D stereoscopic images; filming using two cameras and the 3D conversion using computer software. The use of two cameras requires expensive equipment and the filmed images need further processing after production. On the other hand, 3D conversion technology does not require extra devices in the production process and can also convert the existing 2D contents into 3D, a main reason why many countries are focusing on the development of stereoscopic technology. Stereoscopic conversion is largely divided in to 3 steps; object separation, formation of depth information and stereo rendering. Professor Noh’s teams focused on the optimization of each step to increase the efficiency of the conversion system. Professor Noh’s research team first increased the separation accuracy to the degree of a single hair and created an algorithm that automatically fills in the background originally covered by the separated object. The team succeeded in the automatic formation of depth information using the geographic or architectural characteristic and vanishing points. For the stereo rendering process, the team decreased the rendering time by reusing the rendered information of one side, rather than the traditional method of rendering the left and right images separately. Professor Noh said that ‘although 3D TVs are becoming more and more commercialized, there are not enough programs that can be watched in 3D’ and that ‘stereoscopic conversion technology is receiving high praise in the field of graphics because it allows the easy production of 3D contents with small cost’.
2012.10.20
View 8839
3rd EEWS CEO Forum Held
KAIST EEWS (Energy Environment Water and Sustainability) held the 3rd EEWS CEO Forum at KAIST Seoul Campus. EEWS is a research/education project initiated by KAIST to solve the global issues that the world faces including issues such as: energy depletion, global warming, water shortage, and sustainable development. The 3rd EEWS CEO Forum is dedicated to providing the opportunity to share the vision and experience on technology and policy for green growth. The forum was founded in 2011 with active participation from Woo Ki Jeong (Director of Statistics), Choi Kwang Sik (Korea City Airport, Logistics and Travel, CEO), Kang Young Joong (Daekyo Group, CEO), Yoo Kyung Sun (Eugene Group, CEO), all experts in the field of green growth. The forum consisted of presentations and debate on topics such as: international outlook on green growth, development projects based on new renewable energy, battery of electric vehicles, and development of solar cells. Kim Sang Hyup member of the Presidential Committee on Green Growth started off the series of lectures with the topic of ‘International Outlook on Green Growth’. Kim Joong Gyum CEO of KEPCO followed up with ‘the Future of Electricity Generation Industry and Renewable Energy’, Kim Soo Ryung Director of LG Chemicals gave a talk on ‘Electric Vehicles and the Future of the Battery Industry’, and finally Choi Gi Hyuk CEO of SDN Ltd. gave the final lecture on ‘the Inflection Point of Solar Cell Industry’.
2012.10.16
View 8845
KAIST Evaluated 1st in Joong Ang Newspaper University Evaluation for 5 Consecutive Years
KAIST was evaluated 1st in the Joong Ang Newspaper University Evaluation scoring 241 points out of a total of 300 points. This is KAIST’s 5th consecutive year being ranked 1st by Joong Ang Newspaper’s University Evaluation. POSTECH, Yonsei University, Seoul National University, Sungkyunkwan University, and Korea University followed behind. The Joong Ang Newspaper University Evaluation started in 1994 and KAIST is the first university to be evaluated 1st for 5 consecutive years. KAIST scored high in education environment, finance, and professor research criteria. Joong Ang Newspaper evaluated 102 universities and based the evaluation on: education environment (90 points), globalization (50 points), professor research (100 points), and reputation (60 points).
2012.10.16
View 6900
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