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975 results on '"Park, Jihoon"'

153. LOCAL CONNECTEDNESS OF THE SPACE OF PUNCTURED TORUS GROUP

Author

Hong, Sungbok and Park, Jihoon

Subjects
Mathematics::Geometric Topology, 57M50, 30F40
Abstract

We will give a necessary condition for local connectedness of the space of Kleinian punctured torus group using Bromgerg's local coordinate system and provide a sufficient condition for local connectedness on a dense subset of the necessary condition. That is, the collection of the points where the boundary of the space of punctured torus group is not locally connected is a dense subset of the points satisfying the necessary condition.

Published
2019

159. Dirac-Source Diode with Sub-unity Ideality Factor

Author

Myeong, Gyuho, primary, Shin, Wongil, additional, Kim, Seungho, additional, Lim, Hongsik, additional, Kim, Boram, additional, Jin, Taehyeok, additional, Sung, Kyunghwan, additional, Park, Jihoon, additional, Fuhrer, Michael, additional, Watanabe, Kenji, additional, Taniguchi, Takashi, additional, Liu, Fei, additional, and Cho, Sungjae, additional

Published
2021
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164. Investigation of the Global Shutter Operation of the Quantum-Dot Short-Wave Infrared Image Sensor

Author

Kim, Jaenam, Kim, Joo-Hyoung, Chang, Yun-Tzu, Park, Jihoon, Jin, Minhyun, Pejovic, Vladimir, Georgitzikis, Epimitheas, Thijs, Steven, Lieberman, Itai, Li, Yunlong, Heremans, Paul, Malinowski, Pawel, Chun, Jung-Hoon, and Lee, Jiwon

Abstract

Quantum dot (QD) thin-film photodiodes (TFPDs) are studied extensively in the image sensor field as they can pave the way toward the cost-efficient implementation of short-wave infrared (SWIR) cameras. Interestingly, the QD TFPD image sensors can be operated in the global shutter (GS) mode by turning on the photodiode (PD) only during integration time and subsequently turning it off during the readout. This offers the substantial advantage of reducing the pixel size as it eliminates the need for additional transistors or capacitors that are otherwise typically used in conventional GS pixels. So far, no comprehensive study has yet been performed on this PD turn on/off operation mode. Therefore, in this work, we investigated the PD turn on/off GS operation mode in comparison with the conventional voltage domain (VD) GS operation—a first in-depth report of its kind. We confirm that the PD turn on/off GS mode has the advantage of a small pixel size but comes at the cost of an increasing nonlinearity as the integration time approaches the PD speed limitation. We report a parasitic light sensitivity (PLS) of −70 dB over the visible (VIS) and SWIR range and moreover demonstrate that the PLS has the potential to reach $< -100$ dB based on the discrete PD measurement.

Published
2023
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170. Calculation of Three-dimensional Energy Product for Isotropic Nd 2 Fe 14 B Magnet.

Author

Kim, Namkyu, Han, Hee-Sung, Choi, Chul-Jin, Lee, Ki-Suk, and Park, Jihoon

Subjects
MAGNETIC properties, PERMANENT magnets, MAGNETS, MAGNETIZATION, SIMULATION methods & models, MAGNETIZATION reversal
Abstract

A conventional energy product calculated by the product of the B-field and the H-field is not sufficient for representing the performance of a magnet because it considers the homogeneous and only the uniaxial magnetic properties of the magnet. The conventional energy product has been compared with another energy product obtained by integrating the scalar product of the B-field and the H-field of each cell composed of the three-dimensional components. We investigated a model system by micromagnetic simulation using finite differential method (FDM) and calculated the full hysteresis of the magnet. The model system of a Nd2Fe14B magnet composed of grains with a diameter of about 100 nm was assumed. In the case of the isotropic multi-grain magnet, the energy product calculated by the integration method was 28% larger than the energy product obtained by the conventional way, although a discrepancy between the distribution of the magnetizations and the demagnetizing fields at the reversal process resulted in the decrease of the energy product. [ABSTRACT FROM AUTHOR]

Published
2022
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180. Physical and Magnetic Properties of ThMn 12 -Type Sm(Fe 0.8 Co 0.2) 10 Si 2 Melt-Spun Ribbons.

Author

Qian, Hui-Dong, Lim, Jung Tae, Kim, Jong-Woo, Yang, Yang, Zhou, Tian Hong, Jeon, Han Kook, Park, Jihoon, and Choi, Chul-Jin

Subjects
MAGNETIC properties, GRAIN size, COERCIVE fields (Electronics), MAGNETIZATION
Abstract

The magnetic properties of ThMn12-type Fe-rich compounds were investigated by producing Sm(Fe0.8Co0.2)10Si2 ribbons. The produced ribbons, with different conditions by varying the melt-spinning conditions, were characterized to investigate physical and magnetic properties. Weight fraction of ThMn12-type phase decreased from 94.5 to 57.1 wt. % as the melt-spinning wheel speed increased from 6.5 to 39 m/s, and corresponding magnetizations and coercivities were substantially varied; the coercivity increased up to 0.175 T from 0.058 T by increasing the wheel speed from 6.5 to 26 m/s, and their magnetization also increased from 89.81 Am2/kg to 105.58 Am2/kg, even though the content of ThMn12-type phase decreased. Morphologies of the ribbons were also observed to verify the melt-spinning effects on the surface conditions and grain sizes. It was found that the particle and grain sizes in the ribbons became smaller and striped patterns appeared as the wheel speed increased. The grain size decreased from about 1 μm to 250 nm by increasing the wheel speed from 6.5 to 39 m/s. [ABSTRACT FROM AUTHOR]

Published
2022
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189. Iterative decoding based on error pattern correction

Author

Alhussien, Hakim, Park, Jihoon, and Moon, Jaekyun

Subjects
Error-correcting codes -- Evaluation, Decoders -- Usage, Business, Electronics, Electronics and electrical industries
Abstract

The error-pattern correction code is a code specialized to correct dominant error patterns observed at the channel detector output in heavy intersymbol interference channels. In this paper, we consider a turbo-equalizer system that utilizes the error-pattern correcting code (EPCC) as a building component. A soft-input soft-output (SISO) decoder for the EPCC is described, and the performance of the proposed turbo equalizer is compared with those of the conventional turbo equalizer and a low density parity check (LDPC) code system. Index Terms--Error pattern correction code, list decoding, turbo equalization.

Published
2008

198. Characteristics of Exposure to Chloromethylisothiazolinone (CMIT) and Methylisothiazolinone (MIT) among Humidifier Disinfectant-Associated Lung Injury (HDLI) Patients in South Korea

Author

Park, Dong-Uk, primary, Park, Seon-Kyung, additional, Kim, Jiwon, additional, Park, Jihoon, additional, Ryu, Seung-Hun, additional, Park, Ju-Hyun, additional, Lee, So-Yeon, additional, Oh, Han Bin, additional, Kim, Sungkyoon, additional, Zoh, Kyung Ehi, additional, Park, Soyoung, additional, and Kwon, Jung-Hwan, additional

Published
2020
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199. Indirect Time-of-Flight CMOS Image Sensor With On-Chip Background Light Cancelling and Pseudo-Four-Tap/Two-Tap Hybrid Imaging for Motion Artifact Suppression

Author

Kim, Donguk, primary, Lee, Seunghyun, additional, Park, Dahwan, additional, Piao, Canxing, additional, Park, Jihoon, additional, Ahn, Yeonsoo, additional, Cho, Kihwan, additional, Shin, Jungsoon, additional, Song, Seung Min, additional, Kim, Seong-Jin, additional, Chun, Jung-Hoon, additional, and Choi, Jaehyuk, additional

Published
2020
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