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Home > General Lectures
The Organizing Committee is tasked with selecting leaders in our field to present general lectures at the URSI AP-RASC 2016 conference. These 60-minute lectures, highlighting cutting edge research are presented by speakers recognized for their exceptional achievements in our field.
Yahya Rahmat-Samii
Distinguished Professor Department of Electrical Engineering University of California, Los Angeles, USA
Nature Inspired Optimization Techniques in Modern Engineering: Let Darwin and the Bees Help Improve your Designs

Date / Time: August 22 (Mon.) / 11:00~12:00
Place: Convention A~C (4F), Convention Center, Grand Hilton Seoul Hotel


▼ Biography & Abstract
• Biography
Yahya Rahmat-Samii is a Distinguished Professor, holder of the Northrop-Grumman Chair in electromagnetics, member of the US National Academy of Engineering (NAE), winner of the 2011 IEEE Electromagnetics Award and the former chairman of the Electrical Engineering Department at the University of California, Los Angeles (UCLA). Before joining UCLA, he was a Senior Research Scientist at Caltech/NASA's Jet Propulsion Laboratory. Dr. Rahmat-Samii was the 1995 President of the IEEE Antennas and Propagation Society and 2009-2011President of the United States National Committee (USNC) of the International Union of Radio Science (URSI). He has also served as an IEEE Distinguished Lecturer presenting lectures internationally. Dr. Rahmat-Samii is a Fellow of the IEEE, AMTA and ACES. Dr. Rahmat-Samii has authored and co-authored over 1000 technical journal articles and conference papers and has written over 35 book chapters and five books. Dr. Rahmat-Samii has received numerous awards, including the 1992 and 1995 Wheeler Best Application Prize Paper Award for his papers published in the IEEE Antennas and Propagation Transactions, 1999 University of Illinois ECE Distinguished Alumni Award, the IEEE Third Millennium Medal, AMTA’2000 Distinguished Achievement Award, 2001 recipient of an Honorary Doctorate Cassa from the University of Santiago de Compostela, Spain, 2001 Foreign Membership of the Royal Flemish Academy of Belgium for Science and the Arts, 2002 Technical Excellence Award from JPL, 2005 URSI Booker Gold Medal, 2007 Chen-To Tai Distinguished Educator Award of the IEEE AP-S, 2009 IEEE AP-S Distinguished Achievement Award, 2010 UCLA School of Engineering Lockheed Martin Excellence in Teaching Award, 2011 UCLA Distinguished Teaching Award, 2015 Distinguished Engineering Achievement Awards of the Engineers’ Council and 2015 NASA Group Achievement Award. He has had pioneering research contributions in diverse areas of electromagnetics, antennas, measurement and diagnostics techniques, numerical and asymptotic methods, satellite and personal communications, remote sensing and planetary mission antennas, human/antenna interactions, RFID and implanted antennas in medical applications, frequency selective surfaces, electromagnetic band-gap and meta-material structures, applications of the genetic algorithms and particle swarm optimization, etc., (visit http:www.antlab.ee.ucla.edu). Prof. Rahmat-Samii is the designer of the IEEE AP-S logo which is displayed on all IEEE AP-S publications.

• Abstract
Engineers are constantly challenged with the temptation to search for optimum solutions for complex engineering system designs. The ever increasing advances in computational power have fueled this temptation. The well-known brute force design methodologies are systematically being replaced by the state-of-the-art Evolutionary Optimization (EO) techniques. In recent years, EO techniques are finding growing applications to the design of all kind of systems with increasing complexity. Among various EO’s, nature inspired techniques such as Genetic Algorithms (GA), Particle Swarm Optimization (PSO) and the Covariance Matrix Adaptation (CMA) Evolution Strategies (ES) have attracted considerable attention. GA utilizes an optimization methodology which allows a global search of the cost surface via the mechanism of the statistical random processes dictated by the Darwinian evolutionary concept (adaptation, selection, survivability and mutation). PSO is a robust stochastic evolutionary computation technique based on the movement and intelligence of swarms of bees looking for the most fertile feeding location applying their cognitive and social knowledge. The CMA-ES technique is based upon the evolution of a population of individuals, capitalizing on the ideas of survival of the fittest, recombination, and mutation, and this version of ES has only been recently introduced to the applied electromagnetic community. This algorithm has certain similarities in comparison to the standard Genetic Algorithms; however the selection and recombination operators have some key differences. In particular, the notion of average performance among the individuals is an important part of the evolution processes in this algorithm. This presentation will focus on: (a) an engineering introduction to GA, PSO and CMEAES by describing in a novel fashion the underlying concepts and recent advances for those who have used these techniques and for those who have not had any experiences in these areas, (b) demonstration of potential applications of these evolutionary optimization techniques to a variety of electromagnetic engineering designs dealing with space and planetary missions, medical and wireless devices, metamaterials and nano structures, etc., and (c) assessment of the advantages and the limitations of these techniques.
Lou-Chuang Lee
Institute of Earth Sciences, Academia Sinica, Taiwan

ELECTRODYNAMIC COUPLING PROCESSES IN THE SOLAR-TERRESTRIAL ENVIRONMENT

Date / Time: August 23 (Tue.) / 11:00~12:00
Place: Convention A~C (4F), Convention Center, Grand Hilton Seoul Hotel


▼ Biography & Abstract
• Biography
Professor Lou-Chuang Lee received a B. S. degree from National Taiwan University in 1969 and a Ph.D. degree from Caltech in 1975. He specializes in space and plasma physics. Before 1995, he performed research at NASA/Goddard Space Flight Center, University of Maryland and University of Alaska. Upon returning to Taiwan in 1995, Prof. Lee served as the Dean of the College of Science, National Cheng Kung University, Director of National Space Program Office, the founding President of the National Applied Research Laboratories, the President of National Central University, and the Minister of National Science Council. He is currently a distinguished research fellow of Institute of Earth Sciences, Academia Sinica. Prof. Lee received many honors, including the Fulbright Distinguished Scholar, the Presidential Science Prize in Taiwan, Academician of Academia Sinica, Elected Member of the World Academy of Sciences (TWAS), International Academy of Astronautics (IAA) and International Academy of Engineering, Russian Academy of Engineering (IAE). Prof. Lee developed several new theories to explain observed space phenomena. His major research achievements include: (a) the turbulence spectrum of interstellar medium, (b) the cyclotron maser theory for the generation of auroral kilometric radiation, (c) the multiple X-line reconnection model for magnetic flux transfer events, (d) the formation mechanism of solar prominences, (e) a new mechanism for solar coronal heating, (f) the discovery of "gigantic jets" in the Earth’s upper atmosphere, and (g) an electric coupling model of lithosphere-atmosphere-ionosphere.

• Abstract

ELECTRODYNAMIC COUPLING PROCESSES IN THE SOLAR-TERRESTRIAL ENVIRONMENT


The solar–terrestrial system consists of many neighboring physical regions, which include the photosphere, solar corona, solar wind, magnetosphere, ionosphere, atmosphere, lithosphere and interstellar medium. The electrodynamic coupling among neighboring regions leads to the generation of many observed natural phenomena. The followingimportant electrodynamic coupling processes will be presented and reviewed in this talk. (a)The plasma shear flows in the solar photosphere lead to the formation and eruption of solar prominences. (b)The coupling between solar wind and magnetosphere through magnetic reconnection and kinetic Alfvén waves (KAWs) leads to the transport of particles and energy from the solar wind to magnetosphere.(c) The electric coupling among lithosphere, atmosphere and ionosphere may lead to total electron content (TEC)variations and formation of nighttimeplasma bubbles in the ionosphere. The stressed-rockin the lithosphere can generate currents before earthquake and acts as a dynamo to provide currents for the lithosphere-atmosphere-ionosphere coupling.(d) The coupling of heliosphere to the interstellar medium leads to the formation of termination shock, heliosheath and heliopause as observed by Voyager 1 and 2.
Kyungwhoon Cheun
Executive Vice President Next Generation Communications Business Team IT and Mobile Communications Division Samsung Electronics Co., Ltd

5G, Moving Steps Closer to Commercialization

Date / Time: August 24 (Wed.) / 11:00~12:00
Place: Convention A~C (4F), Convention Center, Grand Hilton Seoul Hotel


▼ Biography & Abstract
• Biography

Dr. Kyungwhoon Cheun received his B.S. degree in Electronics Engineering from Seoul National University in 1985. He earned his M.S. and Ph.D. degrees from the University of Michigan, Ann Arbor in 1987 and 1989, respectively.

He served as a professor at the University of Delaware from 1989 to 1991 and then at the Pohang University of Science and Technology (POSTECH) from 1991 to 2014. While at POSTECH, he headed the national ITRC center for Broadband OFDM Multiple Access (BrOMA), an eight-year research program supported by the Korean Ministry of Knowledge and Economy.

Aside from his academic achievements, he, as an engineering consultant, has contributed to many break-through innovations in diverse industry areas of wireless communications and audio signal processing. He was on leave at Witechs and NSystems in San Diego where he developed efficient receiver algorithms for WLANs and WCDMA. From 2004 to 2011, he served as the Chief Technical Officer (CTO) of Pulsus Technologies Inc., taking the lead of developing sound processing algorithms and sigma-delta modulation based full digital audio amplifier SoCs.

Since 2012, he has been with Samsung Electronics leading research and development for next generation cellular and Wi-Fi networks. Currently he is an Executive Vice President of the Next Generation Communications Business Team.


• Abstract

With the ever-increasing demands on mobile data traffic and stronger requirements on latency and reliability of novel mobile services, it becomes more challenging to meet those diverse needs by sheer migration of the existing cellular technologies. Consequently, 3GPP set out 5G standardization to accommodate those needs with evolutionary technologies in April 2016. Many mobile operators and equipment vendors started to take into consideration 5G as more than just a research topic and even show strong interests in the pre-commercial trials of 5G technologies in the coming years.
With a commitment to take the lead role of pursuing technical innovations in the mobile communication industry, Samsung has put lots of efforts to research and development of 5G core technologies since 2011. Major research areas include, but not limited to, millimeter wave, new waveform, enhanced channel coding, FD-MIMO, which have been verified and refined up to commercial-grade technologies.

This presentation starts from the 5G vision and requirements, Samsung’s recent R&D results both in the legacy bands below 6GHz and higher bands above 6GHz. It describes recent channel measurements/modeling activities, testbed developments and various test results in the millimeter wave bands, and also the R&D results in the legacy bands such as new waveform and FD-MIMO. Finally, some results from the field trials with leading mobile operators are shown as clear evidence to the feasibility of the new 5G technologies in the real environments.
Hyeon K. Park
National Fusion Research Institute & Ulsan National Institute of Science and Technology

ROLE OF ELECTROMAGNETIC WAVES IN MAGNETIC FUSION PLASMA RESEARCH

Date / Time: August 25 (Thu.) / 11:00~12:00
Place: Convention A~C (4F), Convention Center, Grand Hilton Seoul Hotel


▼ Biography & Abstract
• Biography
Hyeon K. Park received Ph.D. from UCLA, USA in 1984 for the first multi-channel FIR scattering experiment from the plasma waves in laboratory plasmas. Since then, he was with the Princeton Plasma Physics Laboratory (PPPL), Princeton University from 1984 to 2007. Here, he developed a Multi-channel IR Interferometer/polarimeter system for the US flagship fusion device, Tokamak Fusion Test Reactor (TFTR) and multi-channel scattering system for National Spherical Tokamak Experiment (NSTX) at PPPL. In late 1990’s, he has focused on developing an Electron Cyclotron Emission Imaging (ECEI) and Microwave Imaging Reflectometry (MIR) systems for 2D visualization of magnetohydrodynamic instabilities and turbulences in the plasma to enhance the understanding of complex physics of plasma dynamics. Following the first successful demonstration on TEXTOR device, Germany, the ECEI system has been deployed in most of the toroidal fusion plasma devices (DIII-D, USA, AUG, Germany, EAST, China, LHD, Japan) throughout the world and many new physics, that were not available with the conventional diagnostics, have been reported. In 2008, he joined the POSTECH, Korea as professor in physics department and established fusion plasma research center for developing the most advanced 2D/3D ECE imaging and MIR systems on KSTAR. His team unveiled the images of edge instabilities (ELMs) for the first time in KSTAR. In 2013, he moved to physics department, UNIST, Korea and established Fusion Plasma Stability and Confinement Research Center. The objective the UNIST center is to challenge the unsolved physics problems in tokamak physics in KSTAR and WEST, France in which his team is developing ECEI system. In addition to the leading role in UNIST effort, he has been appointed as the director of KSTAR Research Center, NFRI, Daejeon Korea in 2015 and leads the KSTAR research. He is a Fellow of APS and has served International Tokamak Plasma Activity diagnostic division as Co-chair and Chair in 2008-2013. He has served numerous international and national scientific and policy committees. He has been serving PPCF as an editorial board member since 2008. He has published ~600 papers [SCI journals (~300) and conference proceedings (~300)] and numerous plenary and invited talks in major and topical conferences for fusion plasma research.

• Abstract
The progress of magnetic fusion plasma research via tokamak device (i.e., fusion grade plasma confined in a toroidal magnetic field) has reached to a point where electrical breakeven is challenged in ITER in which the output power will be 10 times more than the input power. Such progress is feasible due to advances in high power Radio Frequencies (RF) and Microwave technologies and understanding of wave behaviors in magnetically confined plasmas where waves are extremely rich due to its collective behavior. The high temperature plasma confined in magnetic field is also rich in emissions of a wide range of wavelength ranging from radio frequencies to -ray. The passive emissions from the plasmas have been used to diagnose the plasma properties. For active diagnostic purpose, variety of form EM waves (lasers and microwaves) has been employed for study of plasma dynamics and measurement of plasma parameters. Tokamak device such as the Korean Superconducting Tokamak Advanced Research (KSTAR) not only requires external heating schemes to increase the ion temperature up to ~10keV for optimum DT reaction but also external current drive sources for steady state operation. Here, RF and microwave heating based on cyclotron resonance of ion and electron in plasmas has been effective in conjunction to high power neutral beam. The tokamak device based on superconducting magnets requires externally launched current drive system for steady state operation. For effective heating and current derive in tokamaks, the key research issues are; Development of stable and robust high power RF (30~100 MHz) and microwave sources (50~100 GHz), design and fabrication of robust launchers for RF and microwaves and understanding of the physics of wave propagation and absorption/damping process in plasmas aided by modeling of wave propagation and coupling in the plasma. For passive plasma diagnostics, emissions from acceleration, ionization and recombination process of the plasma species have been widely used to measure the plasma parameters. The examples are ion temperature and plasma rotation measurement by X-ray crystal spectroscopy and Charge Exchange Recombination, Motional Stark Effect of energetic beam ions for magnetic field measurement, and Electron Cyclotron Emission for electron temperature and 2D images of electron temperature fluctuations. For active non perturbing diagnostics, analysis of transmission, reflection and scattering of the externally launched EM waves is aided by the physics modeling to probe the macroscopic instabilities, underlying physics of transport in addition to the measurement of plasma parameters. They are coherent and incoherent Thomson scattering for electron temperature, density and fluctuations, and interferometry and polarimetry for electron density and magnetic field measurement, and reflectometry for electron density and fluctuations.