Prof. Gerwin Schalk, National Center for Adaptive Neurotechnologies<\/p>\n

Dec. 12th, 2016, IEEE Seminar<\/p>\n

Topic: Applying Engineering Principles to Applied ECoG-based Research.<\/p>\n

Our laboratory integrates and advances scientific, engineering, and clinical concepts to innovate, develop and test new neurotechnologies and to apply them to basic and applied research. These multidisciplinary efforts span a variety of areas, including computational, cognitive, and systems neuroscience, signal processing, machine learning, statistics, computer science, and neurology\/neurosurgery. To perform this research, we focus most of our efforts on signals recorded directly from the surface of the brain (electrocorticography (ECoG)).  Our vision is to revolutionize the way we can study the brain, and to develop important clinical tools for diagnosis or treatment of nervous system function.<\/p>\n

 <\/p>\n

Prof. Hyung Il Koo, Ajou University<\/p>\n

Nov. 7th, 2016, IEEE Seminar<\/p>\n

Topic: Understanding convolutional neural networks for vision problems.<\/p>\n

Recently, CNN (convolutional neural network) architectures showed state-of-art performance on several computer vision tasks such as classification, detection, segmentation, and tracking. In this talk, we first review well-known CNN architectures for image classification (LeNet, AlexNet, ZFNet, GoogLeNet, and VGGNet) and discuss what the CNNs have learned from the data, by using visualization techniques. Based on the understanding of feature maps, we will discuss the motivations of CNN architectures for detection and segmentation tasks.<\/p>\n

 <\/p>\n

Prof. Kang Kim, University of Pittsburgh<\/p>\n

Oct. 14th, 2016, IEEE Seminar<\/p>\n

Topic: A new approach for high-resolution and high-sensitivity ultrasound imaging using novel contrast agents. Ultrasound imaging, a real-time, non-invasive, non-destructive, and non-ionizing tool, has great advantage especially for in vivo study in biology and medicine. However, it suffers in general with relatively low spatial resolution and sensitivity. In this presentation, a novel multi-modality contrast agent and associated imaging technology will be introduced and discussed to overcome such limitations. As promising multi-modality contrast agents for combined ultrasound and photoacoustic imaging, phase-transition droplets that react to a short-pulse laser have been synthesized and evaluated. The underlying mechanism of vaporization and resulting acoustic signal have also been closely investigated. In addition, a novel imaging technology using vaporized droplets that provides superior spatial resolution beyond the acoustic diffraction limit has been developed.<\/p>\n

 <\/p>\n

Prof. Jung-Woo Choi, Ph. D. KAIST<\/p>\n

Aug. 22nd, 2016, IEEE Seminar<\/p>\n

Topic: Internet of Sounding Things: sound field control with smart sound objects<\/p>\n

Sound field control techniques have been widely adopted for sound field reproduction, virtual\/augmented reality, and personal sound zone. Theoretical studies have shown that a desired sound field can be nearly reconstructed using many secondary control sources or loudspeakers distributed in space, but sound field reproduction technologies haven\u2019t yet achieved the expected commercial success. Their difficulty in market penetration is mostly attributed to cost and installation complexity. Multichannel loudspeaker systems usually require many cable connections and bulky loudspeakers, which are not cost-effective from the consumer\u2019s viewpoint. Moreover, the installation of loudspeakers is a substantial hurdle in implementing a practical system for home environments. To implement a practical sound field control system, difficulties with the construction of massive acoustic arrays will have to be resolved.<\/p>\n

 <\/p>\n

Prof. Gyungsu Byun, Southern Methodist University (SMU), Dallas, Texas<\/p>\n

(Jul. 7th, 2016, IEEE Seminar)<\/p>\n

Topic: Energy-Efficient and High-Performance Communication Microsystems Design. In this seminar, a high-speed and low-power mixed-signal\/analog\/RF-IC design for mobile computing\/communication systems will be presented. In the era of the nanometer CMOS technology, power and bandwidth requirements have become more stringent for mobile systems. This is largely because mobile devices (such as smart phones) are more intensively relying on the use of graphics. Therefore, microprocessor and memory manufacturers are relying more on energy-efficient and high-speed computing\/communication interface designs such as clocking (PLL\/DLL), transceiver, filters\/sensors and RF key circuits (LNA\/mixers, oscillators). Since the power consumption of mobile computing\/communication systems has been one of the most critical design factors in nanometer designs, the communication infrastructure would significantly impact the performance, area, and power of mobile devices, we explore the use of ultra-low-power mixed-signal\/analog\/RF designs to a wire-line\/wireless communication links, 3D-vertical IOs, failure-resistant systems (FRS) and implantable biomedical applications. In this talk, latest IC prototyping and designs including latest fabricated chip results will be presented.<\/p>\n

 <\/p>\n

Prof. Sumit Roy, U. Washington, Seattle<\/p>\n

(Jun. 29th, 2016, IEEE Seminar)<\/p>\n

Topic: Radio Mapping Using Spectrum Sensing. The preferred systems architecture for opportunistic use of White Spaces (cognitive radio based spectrum sharing) requires in-situ client-driven spectrum sensing in conjunction with centralized databases. This talk will focus on principles of distributed spectrum sensing viewed as a statistical spatial sampling problem and it\u2019s application to Radio Mapping, i.e. updating of a-priori TV coverage maps. I will explain how 2-Dim. interpolation techniques may be used to determine desired sampling locations that minimize the boundary estimation variance, and it\u2019s performance advantages compared to other clustering (e.g. K-nearest neighbor) approaches.<\/p>\n

 <\/p>\n

Prof. Hyung-Min Park, Sogang University<\/p>\n

(May 20th, 2016, IEEE Seminar)<\/p>\n

Topic: Sound Source Localization. Gwangju Section invited Prof. Hyung-Min Park who is with Sogang University. In this talk, various source localization techniques were introduced. Extensive Q&A followed. \uc694\uc57d: \ubcf8 \uc138\ubbf8\ub098\uc5d0\uc11c\ub294 \uc74c\uc6d0 \uad6d\uc9c0\ud654 \uae30\uc220\uc5d0 \ub300\ud574 \uc18c\uac1c\ud55c\ub2e4. \uba3c\uc800 \ub450 \uac1c \uc774\uc0c1\uc758 \ub9c8\uc774\ud06c\ub97c \uc0ac\uc6a9\ud560 \ub54c \uc2e0\ud638\ucc98\ub9ac\uc5d0 \ub300\ud574 \uac04\ub2e8\ud788 \uc124\uba85\ud558\uace0 \uc74c\uc6d0 \uad6d\uc9c0\ud654\uc758 \ub300\ud45c\uc801 3\uac00\uc9c0 \ubc29\ubc95\uc778 \uc778\uac04\uc758 \uccad\uac01 \uc815\ubcf4 \ucc98\ub9ac\uc5d0 \uae30\ubc18\ud55c \ubc29\ubc95, \ub9c8\uc774\ud06c \uc0ac\uc774\uc758 \uc0c1\uad00\uad00\uacc4\uc5d0 \uae30\ubc18\ud55c \ubc29\ubc95, \uadf8\ub9ac\uace0 \ub2e4\ucc44\ub110 \uc74c\ud5a5 \ucc44\ub110 \ucd94\uc815\uc5d0 \uae30\ubc18\ud55c \ubc29\ubc95\uc744 \uc18c\uac1c\ud55c\ub2e4. \uac01 \ubc29\ubc95\uc758 \uc7a5\ub2e8\uc810\uc744 \ubd84\uc11d\ud558\uace0 \uc774\ub7ec\ud55c \ubb38\uc81c\uc810\uc744 \uac1c\uc120\ud55c \ubc29\ubc95 \ubc0f \uc2e4\ud5d8\uacb0\uacfc\ub97c \uc81c\uc2dc\ud558\uace0 \uacb0\ub860\uc744 \ub9fa\ub294\ub2e4.<\/p><\/td>

 <\/p>\n

2015<\/p><\/td>

Prof. Jongsun Kim, Hongik University<\/p>\n

(Dec. 31, 2015, IEEE Seminar)<\/p>\n

Topic: High-Speed Clock Generation and Data Recovery Techniques for 60GHz Systems. In this talk, a 10-20 Gbps serializer\/deserializer (SerDes) with a phase interpolator (PI) based clock and data recovery (CDR) circuit for high-speed and short-range 60GHz wireless chip-to-chip communication is presented. The PI-based CDR uses an 8-phase delay-locked loop (DLL) to produce a set of evenly spaced reference clock phases. The phase vernier, then transforms the 8-phases to sampling clocks for the sampler, which performs 2\u00d7 oversampling to recover the data from the input signal. Also, a new multiplying delay-locked loop (MDLL) is presented that can provide programmable fractional-ratio frequency synthesis of de-skewed clock. The proposed fractional-ratio MDLL (FMDLL) employs a new select logic for controlling three operation modes and utilize a new phase detecting structure to achieve inherent cancellation of internal phase offset.<\/p>\n

 <\/p>\n

Dr. Sungho Lee, Managerial Researcher, KETI.<\/p>\n

(Dec. 29, 2015, IEEE Seminar)<\/p>\n

Topic: Wireless Power Transfer and Energy Harvesting Technique for IoT Devices. Gwangju Section invited Dr. Sungho Lee who is a Managerial Researcher in KETI. In this talk, trends and designs of wireless power transfer (WPT) and energy harvesting techniques were introduced to extend the battery time, removing external connectors and power cables. After the seminar, the members of the IEEE Gwangju Sections continued discussion with Dr. Lee over the dinner.<\/p><\/td>