Search Results - "Kim, Hyeon Sik"

Design of Frequency-Adaptive Flux Observer in PMSM Drives Robust to Discretization Error by Yoo, Jiwon, Kim, Hyeon-Sik, Sul, Seung-Ki

“…This article analyzes the effect of discretization in the frequency-adaptive flux observer (FAO). Although FAO has structural simplicity and ease of…”
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Online MTPA Operation of IPMSM Based on Dual-Loop Control in Polar Coordinates by Kim, Hyeon-Sik, Yoo, Jiwon, Sul, Seung-Ki

“…In this article, a maximum online torque per ampere (MTPA) control is proposed for torque control of interior permanent magnet synchronous motors. First,…”
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MTPA Tracking Control of Sensorless IPMSM Based on Square-Wave Voltage Signal Injection by Yoo, Jiwon, Kim, Hyeon-Sik, Sul, Seung-Ki

“…This article proposes an online maximum torque-per-Ampere (MTPA) control of an interior permanent-magnet synchronous motor (IPMSM) based on the square-wave…”
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Distortion-Minimizing Flux Observer for IPMSM Based on Frequency-Adaptive Observers by Kim, Hyeon-Sik, Sul, Seung-Ki, Yoo, Hyunjae, Oh, Jaeyoon

“…For stable and efficient drives of interior permanent-magnet synchronous machines (IPMSMs), stator flux should be observed across a wide speed range. However,…”
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Online MTPA Control of IPMSM Based on Robust Numerical Optimization Technique by Kim, Hyeon-Sik, Lee, Younggi, Sul, Seung-Ki, Yu, Jayeong, Oh, Jaeyoon

“…This paper presents an online maximum torque per ampere (MTPA) control that considers both magnetic saturation and cross-magnetization effects of interior…”
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Ferroelastic–Ferroelectric Multiferroicity in van der Waals Rhenium Dichalcogenides by Jeong, Jaehun, Kim, Hyeon‐Sik, Kwon, Gihyeon, Jeong, Kwangsik, Lee, Hyangsook, Lee, Ji Hye, Park, Myunguk, Lee, Changjun, Yu, Sanghyuck, Kim, Heegoo, Im, Seongil, Yoo, Kyunghwa, Lee, Eunha, Cho, Mann‐Ho

“…2D multiferroics with combined ferroic orders have gained attention owing to their novel functionality and underlying science. Intrinsic…”
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Discrete-Time Voltage Controller for Voltage Source Converters With LC Filter Based on State-Space Models by Kim, Hyeon-Sik, Jung, Hyun-Sam, Sul, Seung-Ki

“…State-space control could provide both high dynamic performance and sufficient stability margin to voltage source converters with LC filter. However, an…”
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Analysis and Compensation of Inverter Nonlinearity for Three-Level T-Type Inverters by Kim, Hyeon-Sik, Kwon, Yong-Cheol, Chee, Seung-Jun, Sul, Seung-Ki

“…This paper addresses the inverter nonlinearity of a three-level T-type inverter. The main causes of the nonlinearity are pulse shaping, pulse skipping due to…”
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Real-Time Torque Control of IPMSM Under Flux Variations by Kim, Hyeon-Sik, Sul, Seung-Ki

“…For interior permanent magnet synchronous motor (IPMSM) drives, accurate torque control and loss-minimizing operation are essential issues to keep up the…”
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Common-Mode Voltage Reduction of Three-Level Four-Leg PWM Converter by Chee, Seung-Jun, Ko, Sanggi, Kim, Hyeon-Sik, Sul, Seung-Ki

“…This paper presents a carrier-based pulsewidth modulation (PWM) method that reduces the common-mode voltage (CMV) of a three-level four-leg converter. Based on…”
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Green synthesis of bioactive polysaccharide-capped gold nanoparticles for lymph node CT imaging by Uthaman, Saji, Kim, Hyeon Sik, Revuri, Vishnu, Min, Jung-Joon, Lee, Yong-kyu, Huh, Kang Moo, Park, In-Kyu

“…[Display omitted] •M-GNPs as CT contrast agent for lymph node imaging.•M-GNPs were spherical nanoparticles with an average diameter of 9.18±0.71nm.•M-GNPs…”
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Minimum Torque Ripple Pulse Width Modulation With Reduced Switching Frequency for Medium-Voltage Motor Drive by Jung, Hyun-Sam, Hwang, Chae-Eun, Kim, Hyeon-Sik, Sul, Seung-Ki, Hee-Won, An, Yoo, Hyunjae

“…In this paper, the characteristics of ripple current of a multimegawatt drive system fed by a pulse-width modulation (PWM) inverter are investigated. Based on…”
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Resonance Suppression Method for Grid-Connected Converter With LCL Filter Under Discontinuous PWM by Kim, Hyeon-Sik, Sul, Seung-Ki

“…This paper presents a resonance suppression method that reduces current oscillation incurred by the LCL -filtered grid-connected converter's discontinuous PWM…”
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Assessment of MicroPET Image Quality Based on Reconstruction Methods and Post-Filtering by Kim, Hyeon-Sik, Lee, Byeong-il, Ahn, Jae-Sung

“…The accuracy of positron emission tomography (PET) imaging is hampered by the partial volume effect (PVE), which causes image blurring and sampling. The PVE…”
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Forming Stable van der Waals Contacts between Metals and 2D Semiconductors by Kwon, Gihyeon, Kim, Hyeon‐Sik, Jeong, Kwangsik, Kim, Myeongjin, Nam, Gi Hwan, Park, Hyunjun, Yoo, Kyunghwa, Cho, Mann‐Ho

“…High‐performing 2D electrical and optical devices can be realized by forming an ideal van der Waals (vdW) metal contact with weak interactions and stable…”
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Coronary flow reserve and relative flow reserve measured by N-13 ammonia PET for characterization of coronary artery disease by Cho, Sang-Geon, Park, Ki Seong, Kim, Jahae, Kang, Sae-Ryung, Song, Ho-Chun, Kim, Ju Han, Cho, Jae Yeong, Hong, Young Joon, Jabin, Zeenat, Park, Hee Jeong, Jeong, Geum-Cheol, Kwon, Seong Young, Paeng, Jin Chul, Kim, Hyeon Sik, Min, Jung-Joon, Garcia, Ernest V., Bom, Henry Hee-Seung

“…Objective We evaluated the relationships between coronary flow reserve (CFR) and relative flow reserve (RFR) measured by N-13 ammonia positron emission…”
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Interaction- and defect-free van der Waals contacts between metals and two-dimensional semiconductors by Kwon, Gihyeon, Choi, Yoon-Ho, Lee, Hyangsook, Kim, Hyeon-Sik, Jeong, Jeahun, Jeong, Kwangsik, Baik, Min, Kwon, Hoedon, Ahn, Jaemin, Lee, Eunha, Cho, Mann-Ho

“…High Schottky barrier heights at metal–semiconductor junctions due to Fermi-level pinning can degrade the performance of electronic devices and increase their…”
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Discrete state-space voltage controller for voltage source inverters with LC filter based on direct pole-zero placement design by Hyeon-Sik Kim, Hyun-Sam Jung, Seung-Ki Sul

“…State-space control provides both high dynamic performance and sufficient stability margin to voltage source inverters with LC filter. In this paper, discrete…”
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Improvement of electrical performance using PtSe2/PtTe2 edge contact synthesized by molecular beam epitaxy by Kim, Hyeon-Sik, Jeong, Jaehun, Kwon, Gi-Hyeon, Kwon, Hoedon, Baik, Min, Cho, Mann-Ho

“…A PtSe2-based edge-contact field-effect transistor (FET) incorporating PtSe2 as the channel material and PtTe2 as the contact metal is fabricated using…”
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Chemical Interaction of Alexidine and Sodium Hypochlorite by Kim, Hyeon-Sik, DDS, PhD, Zhu, Qiang, DDS, PhD, Baek, Seung-Ho, DDS, PhD, Jung, Il-Young, DDS, PhD, Son, Won-Jun, DDS, PhD, Chang, Seok-Woo, DDS, PhD, Lee, Woocheol, DDS, PhD, Gu, Yu, MD, MSD, Lee, Yoon, DDS, MSD, Hong, Sung-Tae, DDS, PhD, Bae, Kwang-Shik, DDS, PhD, Kim, Ji-Woong, BDS, MSD, Cho, Kun, BDS, MS, Kum, Kee-Yeon, DDS, PhD

“…Abstract Introduction Recent studies have reported the color change and formation of precipitates containing para -chloroaniline (PCA) after a reaction of…”
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