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87 results on '"Kim, Hyun Woo"'

7. A 192-Gb 12-High 896-GB/s HBM3 DRAM with a TSV Auto-Calibration Scheme and Machine-Learning-Based Layout Optimization

Author

Park, Myeong-Jae, primary, Cho, Ho Sung, additional, Yun, Tae-Sik, additional, Byeon, Sangjin, additional, Koo, Young Jun, additional, Yoon, Sangsic, additional, Lee, Dong Uk, additional, Choi, Seokwoo, additional, Park, Jihwan, additional, Lee, Jinhyung, additional, Cho, Kyungjun, additional, Moon, Junil, additional, Yoon, Byung-Kuk, additional, Park, Young-Jun, additional, Oh, Sang-muk, additional, Lee, Chang Kwon, additional, Kim, Tae-Kyun, additional, Lee, Seong-Hee, additional, Kim, Hyun-Woo, additional, Ju, Yucheon, additional, Lim, Seung-Kyun, additional, Baek, Seung Geun, additional, Lee, Kyo Yun, additional, Lee, Sang Hun, additional, We, Woo Sung, additional, Kim, Seungchan, additional, Choi, Yongseok, additional, Lee, Seong-Hak, additional, Yang, Seung Min, additional, Lee, Gunho, additional, Kim, In-Keun, additional, Jeon, Younghyun, additional, Park, Jae-Hyung, additional, Yun, Jong Chan, additional, Park, Chanhee, additional, Kim, Sun-Yeol, additional, Kim, Sungjin, additional, Lee, Dong-Yeol, additional, Oh, Su-Hyun, additional, Hwang, Taejin, additional, Shin, Junghyun, additional, Lee, Yunho, additional, Kim, Hyunsik, additional, Lee, Jaeseung, additional, Hur, Youngdo, additional, Lee, Sangkwon, additional, Jang, Jieun, additional, Chun, Junhyun, additional, and Cho, Joohwan, additional

Published
2022
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8. Scatter denoising technique using Fourier domain filtering and integral imaging

Author

Shinohara, Ryo, Kim, Hyun-Woo, Lee, Jaehoon, Cho, Myungjin, and Lee, Min-Chul

Subjects
Image processing, Scatter removal, Integral imaging
Abstract

Scatter denoising is a challenging project for removing noise under scattered media conditions such as fog and turbid water. In the previous studies, blurring caused by scattering media particles in fog or turbid water was solved by low-pass filtering or by removing the estimated scattering media and then amplifying the brightness with the photon-counting algorithm. However, these methods lose the accurate color information of the object by low-frequency filtering or using the probability-based photon-counting algorithm. Moreover, it is difficult to obtain shape information of an object under heavy turbidity. To solve this problem, we propose a new algorithm of scatter removal by combining Fourier domain filtering and integral imaging. To prove the proposed method, we carry out numerical analysis of experimental results by previous method and our proposed method., 13th International Conference on ITC Convergence (ICTC2021), October 20-22, 2021, Jeju, Korea

Published
2021

9. Digital holographic microscopy (DHM) using a Gaussian weighted sideband to reduce noise from DC spectrum

Author

Kim, Hyun-Woo, Cho, Myungjin, Konishi, Naoki, and Lee, Min-Chul

Subjects
Digital holographic microscopy, Image processing, Three-dimensional imaging, Noise reduction
Abstract

In a reconstruction of the 3D profile in digital holographic microscopy technology, there is a tradeoff relationship between detailed information of the target and the degree of noise depending on how wide the sideband of the Fourier domain is windowed. Besides, the conventional filtering method may not provide accurate height information because it filters using height information of surrounding pixels of the pixel to be filtered. For this reason, we propose a new filtering method that reduces noise by applying a Gaussian weighted windowed sideband in this paper. We compare the proposed filtering method with conventional filtering and verify the advantages and disadvantages of our method., 13th International Conference on ITC Convergence (ICTC2021), October 20-22, 2021, Jeju, Korea

Published
2021

11. Enhanced security computational double random phase encryption by using additional random function

Author

Honda, Kazuaki, Lee, Jaehoon, Kim, Hyun–Woo, Cho, Myungjin, Lee, Min-Chul, Honda, Kazuaki, Lee, Jaehoon, Kim, Hyun–Woo, Cho, Myungjin, and Lee, Min-Chul

Abstract

Image encryption technique has been actively researched and improved. Double Random Phase Encryption (DRPE), known as the typical way of optical encryption, can easily encrypt images. In the decryption process of DRPE, the complex conjugate of random phase mask used as the encryption key in the Fourier domain is used as the decryption key. As a result, computational DRPE has a vulnerability in image transmission when the random phase mask is stolen. Our proposed method utilizes the random function defined by the sender, and it generates additional random variable to multiply the random phase mask. Finally, our proposed method can enhance the security of the encryption process. However, the random phase mask and random variable information generated by random function are needed to decrypt the image. To send both information, high cost is required in the transmission process. To overcome this problem, our proposed method sends the conjugate random phase mask and random function to the receiver for the decryption process. Finally, our proposed method can enhance security with a low transmission cost., 13th International Conference on ITC Convergence (ICTC2021), October 20-22, 2021, Jeju, Korea

Published
2021

12. A generalized sub-pixel mapping algorithm for auto-stereoscopic displays using slanted optical plates

Author

Kyushu Institute of Technology, Hankyong National University, Imaging media research center, Kim, Hyun-Woo, Cho, Myungjin, Kang, Min-Koo, Kim, Sung-Kyu, Lee, Min-Chul, Kyushu Institute of Technology, Hankyong National University, Imaging media research center, Kim, Hyun-Woo, Cho, Myungjin, Kang, Min-Koo, Kim, Sung-Kyu, and Lee, Min-Chul

Abstract

type:Journal Article, Auto-stereoscopic displays using slanted optical plates have inherent subpixel rasterization compared to the normal 2D displays, and mappings between subpixel positions and multi-view indices even vary according to the number of views and angles of slanted optical plates. In this paper, we derive a simple but generalized formula for subpixel mappings from a naïve ray-tracing technique on RGB stripe type panels. To verify the proposed algorithm, our proto-type auto-stereoscopic display using parallax barriers with a slanted angle was used and examined in the experiment. The proposed algorithm is expected to leverage converting multi-view 3D inputs to various types of auto-stereoscopic contents in real time., 2nd International Conference on Artificial Intelligence in Information and Communication (ICAIIC 2020), February 19-21, 2020, Fukuoka, Japan

Published
2020

14. 22.3 A 128Gb 8-High 512GB/s HBM2E DRAM with a Pseudo Quarter Bank Structure, Power Dispersion and an Instruction-Based At-Speed PMBIST

Author

Lee, Dong Uk, primary, Cho, Ho Sung, additional, Kim, Jihwan, additional, Ku, Young Jun, additional, Oh, Sangmuk, additional, Dae Kim, Chul, additional, Kim, Hyun Woo, additional, Lee, Woo Young, additional, Kim, Tae Kyun, additional, Yun, Tae Sik, additional, Kim, Min Jeong, additional, Lim, SeungGyeon, additional, Lee, Seong Hee, additional, Yun, Byung Kuk, additional, Moon, Jun Il, additional, Park, Ji Hwan, additional, Choi, Seokwoo, additional, Park, Young Jun, additional, Lee, Chang Kwon, additional, Jeong, Chunseok, additional, Lee, Jae-Seung, additional, Lee, Sang Hun, additional, We, Woo Sung, additional, Yun, Jong Chan, additional, Lee, Doobock, additional, Shin, Junghyun, additional, Kim, Seungchan, additional, Lee, Junghwan, additional, Choi, Jiho, additional, Ju, Yucheon, additional, Park, Myeong-Jae, additional, Lee, Kang Seol, additional, Hur, Youngdo, additional, Shim, Daeyong, additional, Lee, Sangkwon, additional, Chun, Junhyun, additional, and Jin, Kyo-Won, additional

Published
2020
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21. Following the Leader: An Analysis of Leadership and Conformity in Business Meetings.

Author

Kim, Hyun Woo, Du-Babcock, Bertha, and Chang, Hyejung

Subjects
*BUSINESS meetings, *CONFORMITY, *MATRICES (Mathematics), *LEADERSHIP, *SOCIAL network analysis, *GREEN business
Abstract

Background: Past research has established the importance of discursive leadership in professional communication, but it has not systematically examined how conformity behaviors emerge as a potentially undesirable consequence of discursive leadership. Literature review: Review of the literature on the centrality of communication in leadership processes and conformity behavior suggest a void of analytic tools to adequately examine the negative consequences of discursive leadership. Research question: Are later interlocutors more likely to speak similarly to earlier ones if the earlier interlocutors occupy a more central position in the conversation network? Methodology: Based on 32,000 words of a transcribed meeting corpus, we measured conformity behaviors using Term Frequency-Inverse Document Frequency scores, which are widely used in the information retrieval setting. We also operationalized the strength of discursive leadership as a positional centrality measure in the conversation network using a matrix algebra approach in social network analysis. Results: Findings support the hypothesis that discursive leadership is associated with conformity in language aligned toward discursive leaders’ opinions. Conclusions: This study makes theoretical advances in understanding leadership construction and conformity behaviors between leaders and followers using empirical, authentic meeting data. We also give business people an applied understanding of the process of discursive leadership, which may help them to improve communication efficacy in their organizations by reducing overly conforming behaviors. We recommend that future research include more diverse participants and be combined with a survey to supplement the conversation data. [ABSTRACT FROM AUTHOR]

Published
2020
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22. Demonstration of Tunneling Field-Effect Transistor Ternary Inverter.

Author

Kim, Hyun Woo, Kim, Sihyun, Lee, Kitae, Lee, Junil, Park, Byung-Gook, and Kwon, Daewoong

Subjects
*TUNNEL field-effect transistors, *TUNNEL design & construction
Abstract

We demonstrate tunnel FET (TFET)-based ternary CMOS (T-CMOS) which can operate at supply voltage (VDD) < 0.6 V. The TFET T-CMOS consists of the vertical n/p TFETs and their drain current (ID)–gate voltage (VG) characteristics have sub-60 mV/dec steep subthreshold swing (SS) and hump as the gate and source are overlapped. To verify the formation mechanism of the third output voltage state (V3rd) in the TFET T-CMOS, ID – VGs are analyzed with respect to various drain voltages (VD). As a result, it is revealed that ID – VGs of the n/p TFETs can have the wider flat ON-current regions at smaller VD by drain-side channel inversion and stable V3rd can be formed through the voltage dividing between them. Furthermore, it is found that the hump plays a role to make the steeper output voltage transitions by increasing the ID difference between the n/p TFETs. [ABSTRACT FROM AUTHOR]

Published
2020
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31. Effects of Localized Body Doping on Switching Characteristics of Tunnel FET Inverters With Vertical Structures.

Author

Kwon, Dae Woong, Kim, Hyun Woo, Kim, Jang Hyun, Park, Euyhwan, Lee, Junil, Kim, Wandong, Kim, Sangwan, Lee, Jong-Ho, and Park, Byung-Gook

Subjects
*ALTERNATING current machinery, *FET switches, *ELECTRIC inverters, *SEMICONDUCTOR doping profiles, *VOLTAGE reversal
Abstract

In order to verify the effects of localized body doping (LBD) on alternating current switching performances of tunnel FETs (TFETs) with vertical structures, The TFET inverter composed of n-/p-type TFET with the localized p+/n+ body doping is simulated with the help of mixed-mode device and circuit simulations. As a result, falling/rising delay is significantly improved due to the locally high channel-to-drain side energy barrier induced by the LBD. Furthermore, LBD conditions, such as doping concentration, depth, and width, are optimized to maximize the improvement of falling/rising delay. Based on the optimization results, it is found that enough wide doping width and deep depth are inevitable to minimize the drain voltage ( V D )-induced lowering of the locally increased barrier and the increase of ambipolar current and too wide doping width cannot be applied due to the ON-current reduction caused by the degraded controllability of gate voltage on channel similarly to short channel effects. Moreover, the doping width and depth should be adjusted according to LBD concentration. [ABSTRACT FROM PUBLISHER]

Published
2017
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39. Waveguide-Mode Terahertz Free Electron Lasers Driven by Magnetron-Based Microtrons.

Author

Jeong, Young Uk, Miginsky, Sergey, Gudkov, Boris, Lee, Kitae, Mun, Jungho, Shim, Gyu Il, Bae, Sangyoon, Kim, Hyun Woo, Jang, Kyu-Ha, Park, Sunjeong, Park, Seong Hee, and Vinokurov, Nikolay

Subjects
SUBMILLIMETER wave propagation, TERAHERTZ materials, FREE electron lasers, CAVITY resonators, MICROTRONS, WAVEGUIDE modulators, RADIO frequency measurement, ELECTROMAGNETIC radiation
Abstract

We have developed small-sized terahertz free-electron lasers by using low-cost and compact microtrons combining with magnetrons as high-power RF sources. We could stabilize the bunch repetition rate by optimizing a modulator for the magnetron and by coupling the magnetron with an accelerating cavity in the microtron. By developing high-performance undulators and low-loss waveguide-mode resonators having small cross-sectional areas, we could strengthen the interaction between the electron beam and the THz wave inside the FEL resonators to achieve lasing even with low-current electron beams from the microtron. We used a parallel-plate waveguide in a planar electromagnet undulator for our first THz FEL. We try to reduce the size of the FEL resonator by combining a dielectric-coated circular waveguide and a variable-period helical undulator to realize a table-top THz FEL for applying it to the security inspection on airports. [ABSTRACT FROM PUBLISHER]

Published
2016
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