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142 results on '"Kim, Eunsun"'

1. Feasibility Analysis of In-Band Coexistence in Dense LEO Satellite Communication Systems

Author

Kim, Eunsun, Roberts, Ian P., and Andrews, Jeffrey G.

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

This work provides a rigorous methodology for assessing the feasibility of spectrum sharing between large low-earth orbit (LEO) satellite constellations. For concreteness, we focus on the existing Starlink system and the soon-to-be-launched Kuiper system, which is prohibited from inflicting excessive interference onto the incumbent Starlink ground users. We carefully model and study the potential downlink interference between the two systems and investigate how strategic satellite selection may be used by Kuiper to serve its ground users while also protecting Starlink ground users. We then extend this notion of satellite selection to the case where Kuiper has limited knowledge of Starlink's serving satellite. Our findings reveal that there is always the potential for very high and extremely low interference, depending on which Starlink and Kuiper satellites are being used to serve their users. Consequently, we show that Kuiper can protect Starlink ground users with high probability, by strategically selecting which of its satellites are used to serve its ground users. Simultaneously, Kuiper is capable of delivering near-maximal downlink SINR to its own ground users. This highlights a feasible route to the coexistence of two dense LEO satellite systems, even in scenarios where one system has limited knowledge of the other's serving satellites.

Published
2023

2. Downlink Analysis and Evaluation of Multi-Beam LEO Satellite Communication in Shadowed Rician Channels

Author

Kim, Eunsun, Roberts, Ian P., and Andrews, Jeffrey G.

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

The extension of wide area wireless connectivity to low-earth orbit (LEO) satellite communication systems demands a fresh look at the effects of in-orbit base stations, sky-to-ground propagation, and cell planning. A multi-beam LEO satellite delivers widespread coverage by forming multiple spot beams that tessellate cells over a given region on the surface of the Earth. In doing so, overlapping spot beams introduce interference when delivering downlink concurrently in the same area using the same frequency spectrum. To permit forecasting of communication system performance, we characterize desired and interference signal powers, along with SNR, INR, SIR, and SINR, under the measurement-backed Shadowed Rician (SR) sky-to-ground channel model. We introduce a minor approximation to the fading order of SR channels that greatly simplifies the PDF and CDF of these quantities and facilitates statistical analyses of LEO satellite systems such as probability of outage. We conclude this paper with an evaluation of multi-beam LEO satellite communication in SR channels of varying intensity fitted from existing measurements. Our numerical results highlight the effects satellite elevation angle has on SNR, INR, and SINR, which brings attention to the variability in system state and potential performance as a satellite traverses across the sky along its orbit.

Published
2022

4. Downlink Analysis of LEO Multi-Beam Satellite Communication in Shadowed Rician Channels

Author

Kim, Eunsun, Roberts, Ian P., Iannucci, Peter A., and Andrews, Jeffrey G.

Subjects
Electrical Engineering and Systems Science - Signal Processing, Computer Science - Information Theory
Abstract

The coming extension of cellular technology to base-stations in low-earth orbit (LEO) requires a fresh look at terrestrial 3GPP channel models. Relative to such models, sky-to-ground cellular channels will exhibit less diffraction, deeper shadowing, larger Doppler shifts, and possibly far stronger cross-cell interference: consequences of high elevation angles and extreme "sectorization" of LEO satellite transmissions into partially-overlapping spot beams. To permit forecasting of expected signal-to-noise ratio (SNR), interference-to-noise ratio (INR) and probability of outage, we characterize the powers of desired and interference signals as received by ground users from such a LEO satellite. In particular, building on the Shadowed Rician channel model, we observe that co-cell and cross-cell sky-to-ground signals travel along similar paths, whereas terrestrial co- and cross-cell signals travel along very different paths. We characterize SNR, signal-to-interference ratio (SIR), and INR using transmit beam profiles and linear relationships that we establish between certain Shadowed Rician random variables. These tools allow us to simplify certain density functions and moments, facilitating future analysis. Numerical results yield insight into the key question of whether emerging LEO systems should be viewed as interference- or noise-limited., Comment: Submitted to the IEEE Globecom 2021

Published
2021

12. SrTiO3and (Ba,Sr)TiO3Films Epitaxially Grown on SrRuO3Using Atomic Layer Deposition

Author

Park, Bo-Eun, Lee, Jaeho, Bang, Jeongil, Do, Euncheol, Kim, Eunsun, An, Cheolhyun, Park, Seong Yong, Lee, Sangjun, Yun, Dong-Jin, Lee, Jooho, Kim, Yongsung, and Kim, Hyung-Jun

Abstract

High dielectric constant (k) materials have been investigated to improve the performance of dynamic random access memory (DRAM) capacitors. However, the conventional binary oxides have reached their fundamental limit of k< 100. In this study, we investigated alternative ternary oxides, SrTiO3(STO) and (Ba,Sr)TiO3(BSTO), which were epitaxially grown on SrRuO3(SRO) using atomic layer deposition (ALD). The structural compatibility between SRO and STO enables the in situ crystallization of STO during ALD at a low temperature of 300 °C. Consequently, STO on SRO exhibited no film deformation, a common issue during high temperature postdeposition annealing, and maintained superior crystallinity at a thin thickness down to 50 Å. Furthermore, the dielectric constant of STO can be adjusted by modulating its tunable ferroelectric and dielectric properties through Ba doping. BSTO, with a high dielectric constant (kmax:527) achieved at a Ba doping concentration of approximately 50%, displayed a low leakage current density (3.9 × 10–8A cm–2@ 1 V) and demonstrated excellent reliability of 1012cycles in the metal–insulator–metal capacitors. This study proposes a promising alternative to satisfy the extreme EOT required for next-generation DRAM capacitors.

Published
2024
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16. Evaluation of subchronic oral dose toxicity and allergen of freeze-dried powder of Locusta migratoria (Orthoptera: Acrididae) as a novel food source

Author

Kim, Sun Young, primary, Kwak, Kyu-Won, additional, Park, Ji Yeong, additional, Park, Eun-Sung, additional, Nam, Chun-Ja, additional, An, Kyu Sup, additional, Kim, Hyun-Jin, additional, Yoon, Hyung Joo, additional, Kim, Yong-Soon, additional, Park, Kwanho, additional, Kim, Eunsun, additional, Ryu, Hyeon Yeol, additional, and Kim, Sun-Don, additional

Published
2023
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22. Sirtuin 7 Inhibitor Attenuates Colonic Mucosal Immune Activation in Mice—Potential Therapeutic Target in Inflammatory Bowel Disease

Author

Kim, Sanghyun, primary, Byun, Junhyoung, additional, Jung, Semyung, additional, Kim, Byoungjae, additional, Lee, Kangwon, additional, Jeon, Hanjo, additional, Lee, Jaemin, additional, Choi, Hyuksoon, additional, Kim, Eunsun, additional, Jeen, Yoontae, additional, Lee, Hongsik, additional, Chun, Hoonjai, additional, Keum, Bora, additional, and Kim, Taehoon, additional

Published
2022
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26. Colonic Mucosal Immune Activation in Mice with Ovalbumin-Induced Allergic Airway Disease: Association between Allergic Airway Disease and Irritable Bowel Syndrome

Author

Kim, Sanghyun, primary, Keum, Bora, additional, Byun, Junhyoung, additional, Kim, Byoungjae, additional, Lee, Kijeong, additional, Yeon, Jiwoo, additional, Lee, Jaemin, additional, Choi, Hyuksoon, additional, Kim, Eunsun, additional, Jeen, Yoontae, additional, Lee, Hongsik, additional, Chun, Hoonjai, additional, and Kim, Taehoon, additional

Published
2021
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29. Evaluation of subchronic oral dose toxicity and allergen of freeze-dried powder of Locustamigratoria(Orthoptera: Acrididae) as a novel food source

Author

Kim, Sun Young, Kwak, Kyu-Won, Park, Ji Yeong, Park, Eun-Sung, Nam, Chun-Ja, An, Kyu Sup, Kim, Hyun-Jin, Yoon, Hyung Joo, Kim, Yong-Soon, Park, Kwanho, Kim, Eunsun, Ryu, Hyeon Yeol, and Kim, Sun-Don

Abstract

The migratory locust, Locustamigratoria(Orthoptera: Acrididae), is a well-known edible insect which may serve as new source of human food and animal feed. However, potential toxicity and food safety of L.migratoriahad not been investigated extensively until now. Therefore, in this study, we aimed to investigate toxicity of freeze-dried powder of L.migratoria(fdLM) and identify allergic components in ELISA and PCR techniques. In this subchronic study, fdLM was administered once daily by oral gavage at the doses of 750, 1500, and 3000 mg/kg/day. No toxicological changes were observed in both sexes of rats for 13 weeks in accordance with the OECD guidelines and GLP conditions. In addition, fdLM did not induced increases of serum immunoglobulin E and 21 homologous proteins were not detected under our present conditions. In conclusion, the NOAEL (no-observed-adverse-effect level) was 3000 mg/kg/day and no target organ was identified in both sexes. In conclusion, we found that fdLM is safe with no adverse effects and offers the potential of its use as an edible ingredient or other biological uses.

Published
2023
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32. A Raf-like kinase is required for smoke-induced seed dormancy inArabidopsis thaliana

Author

Lee, Inhye, primary, Kim, Eunsun, additional, Choi, Soobin, additional, Kim, Dayoung, additional, Hong, Wangyu, additional, Choi, Jungki, additional, Choi, Hyunmo, additional, Kim, Jimin, additional, Sable, Ganesh A., additional, Markkandan, Kesavan, additional, Lim, Dongyeol, additional, Park, Soon Ki, additional, Kim, Soo Young, additional, Lee, Sumin, additional, and Soh, Moon-Soo, additional

Published
2021
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48. Characteristics of organic epsilon-near-zero materials (Conference Presentation)

Author

Wu, Jeong Weon, primary, Choi, Kyu-Ri, additional, Kim, Dae Hyeon, additional, Choi, Eunyoung, additional, Kim, Eunsun, additional, Lee, Yeon Ui, additional, Placide, Virginie, additional, Yao, Dandan, additional, Mathevet, Fabrice, additional, Kim, Hyo Jung, additional, Ribierre, Jean-Charles, additional, Zaborova, Elena, additional, Fages, Frédéric, additional, and D’Aléo, Anthony, additional

Published
2018
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50. Structure\textendashcharge transfer property relationship in self-assembled discotic liquid-crystalline donor\textendashacceptor dyad and triad thin films

Author

Lee, Kwang Jin, Woo, Jae Heun, Xiao, Yiming, Kim, Eunsun, Mazur, Leszek Mateusz, Kreher, David, Attias, André-Jean, Matczyszyn, Katarzyna, Samoc, Marek, Heinrich, Beno\ⁱt, Méry, Stéphane, Fages, Frédéric, Mager, Loic, d'Aléo, Anthony, Wu, Jeong Weon, Mathevet, Fabrice, André, Pascal, Ribierre, Jean-Charles, CNRS-Ewha International Research Center, Korea Research Institute of Standards and Science [Daejon] (KRISS), KRISS, Institut Parisien de Chimie Moléculaire (IPCM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Advanced Materials Engineering and Modelling Group, Chimie des polymères (LCP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut Parisien de Chimie Moléculaire (IPCM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre Interdisciplinaire de Nanoscience de Marseille (CINaM), Aix Marseille Université (AMU)-Centre National de la Recherche Scientifique (CNRS), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, and Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)

Subjects
[CHIM]Chemical Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2016

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