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Jinil Chung,Ramclam, Kenneth,Jongsun Park,Ghosh, Swaroop IEEE 2016 IEEE Transactions on Circuits and Systems I: Regul Vol.63 No.1
<P>In many digital signal processing (DSP) applications, static random access memory (SRAM) based embedded memory and flip-flop based shift registers consume a significant portion of area and power. These DSP units are dominated by sequential memory access where SRAM-based memory or flip-flop based shift registers are inefficient in terms of area and power. We propose spintronic domain wall memory (DWM) based embedded memories for DSP building blocks such as survivor-path memories and last-in first-out (LIFO) in Viterbi decoder, first-in-first-out (FIFO) register files in FFT processor and bitonic sorter, and input register of distributed arithmetic (DA) based FIR filter that exploit the unique serial access mechanism, non-volatility and small footprint of the memory for area and power saving. Simulations using 65 nm technology show that the DWM based design achieves significant area and power savings over the conventional SRAM and spin-transfer-torque RAM (STTRAM) based design approach. For 8 k-point FFT processor and Viterbi decoder, the DWM-based design shows 60.6% (8.4%) and 66.4% (-1.7%) area and 60.3% (44.3%) and 60.0% (37.8%) power savings over the conventional SRAM (STTRAM) based design, respectively. For DA-based FIR filter, it achieves 15.7% area and 15.5% power savings over shift register based design.</P>
Time resolved coherence-imaging spectrometer on WEGA stellarator
Chung, Jinil,Kö,nig, Ralf,Howard, John,Otte, Matthias,Klinger, Thomas Published jointly by The Institute of Physics and 2005 Plasma physics and controlled fusion Vol.47 No.6
<P>Imaging sensor technologies such as charge coupled devices and complementary metal-oxide-semiconductor have made remarkable progress in recent years. Fast imaging systems based on these new technologies are now being routinely employed for advanced fusion diagnostics. Since two-dimensional imaging considerably improves the investigation of three-dimensional structural physics, we have installed and operated the first high-speed two-dimensional coherence imaging camera system for the study of ion temperatures and flow velocities in the WEGA stellarator based on the Doppler broadening of 468.6 nm He II line emission. The coherence imaging camera was able to image the complete plasma poloidal cross-section over a toroidal region spanning 10°. The camera was used for basic plasma studies, including electron cyclotron resonance heating (ECRH) power step experiments. The ion temperature of helium plasmas in WEGA is found to be 1.5–2.0 eV at maximum (26 kW) ECRH power. The plasma rotates in the <I>E</I> × <I>B</I> direction with speeds between 500 and 1000 m s<SUP>−1</SUP>, increasing at higher ECRH power. It was confirmed that the flow direction reverses with the direction of the magnetic field. The observed ion temperatures and flows were cross checked against a multi-channel Echelle spectrometer and satisfactory agreement obtained.</P>
Load Regulation을 보상한 Buck DC-DC converter의 설계
정진일(Chung Jinil),박용식(Park Yongsik),김연상(Kim Younsang),곽계달(Kwack Kaedal) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
Proposed huck converter includes load current sensing circuit to compensate load regulation. Because error amp has finite gain, there is load regulation in SMPS. In this paper we use variable current source that is added to positive input of comparator and current of current source is changed by sensed load current. The simulation result shows that proposed buck converter has improved load regulation than conventional buck converter.
Pipelined Bitonic 정렬기 전용 저전력 임베디드 SRAM
최경락(Kyungrak Choi),정진일(Jinil Chung),당호영(Hoyoung Tang),최웅(Woong Choi),박종선(Jongsun Park) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
In this paper, embedded SRAM architecture for bitonic sorter is customized to reduce the unnecessary power consumption. It can be efficiently modified by analyzing the general read and write access patterns. There are some of the needless controls between read and write operations and it can be optimized. According to the simulation results with 65nm CMOS process, the proposed embedded memory used for bitonic sorter achieves 18.75% of power savings with 4.88% of overhead compared to the conventional embedded SRAM approaches.
Lee, Kyuhang,Ko, Jinseok,Jo, Jae Heung,Chung, Jinil Elsevier 2017 Fusion engineering and design Vol.121 No.-
<P><B>Abstract</B></P> <P>An optical system capable of preserving, or minimizing the change of, the polarization properties of incident light has been designed and fabricated for the motional Stark effect diagnostic system which measures internal magnetic field structures inside the tokamak for the Korea Superconducting Tokamak Advanced Research. A dual photoelastic modulator (PEM) with a linear polarizer is included in the optical train with four lenses, a mirror and a dichroic beam splitter. Particular cares have been taken for the polarization properties of the delivered light to be perturbed as little as possible under a strong magnetic field and high vacuum. The lenses are made of STIH-6, a material with low Verdet constant, which minimizes the Faraday rotation. The residual Faraday rotation that takes place in the non-STIH-6 optical elements such as the vacuum window and the optical apertures of the PEM is calibrated out from the in-situ measurements using an in-vessel reference polarizer while energizing the magnetic field coils. In the lens design, the object plane is rotated by 44.8° from the optical axis because of the tilted setup-port. The image surface has a finite curvature to reduce the aberration from the four lenses. The fiber dissector is designed based on the focal plane that aligns the focal points from 25 lines-of-sight, each of which constitutes a bundle of 19 fibers. The fibers run about 35m from the front optics in the tokamak vacuum vessel to the detector in the diagnostic area remote from the tokamak hall. The footprint images at the intersections of the lines-of-sight on the neutral beam trajectory confirms the imaging quality is sufficient to the diagnostic requirement with the designed magnifications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Description on how the polarization control is accomplished in the complex optics for the KSTAR MSE system. </LI> <LI> Various quantitative analyses for the optical performance in accommodating multiple and tilted observation chords. </LI> <LI> Integration of the fabricated components including the fiber bundles and the dissector module for them. In-vessel testing for the image formation with the integrated optics system. </LI> </UL> </P>