Zobrazeno 1 - 10
of 6 307
pro vyhledávání: '"Chang-Sik An"'
In practice, low Earth orbit (LEO) and medium Earth orbit (MEO) satellite networks consist of multiple orbits, each populated with many satellites. A widely used spatial architecture for satellites is the Walker constellation, where the longitudes of
Externí odkaz:
http://arxiv.org/abs/2412.01610
Autor:
Choi, Chang-Sik
Although a significant number satellites are deemed essential for facilitating diverse applications of satellite networks, aerial platforms are emerging as excellent alternatives for enabling reliable communications with fewer satellites. In scenario
Externí odkaz:
http://arxiv.org/abs/2411.19236
Autor:
Choi, Chang-Sik
Low Earth Orbit (LEO) satellite networks connect millions of devices on Earth and offer various services, such as data communications, remote sensing, and data harvesting. As the number of services increases, LEO satellite networks will continue to g
Externí odkaz:
http://arxiv.org/abs/2408.05070
Analysis of a Delay-Tolerant Data Harvest Architecture Leveraging Low Earth Orbit Satellite Networks
Autor:
Choi, Chang-Sik
Reaching all regions of Earth, low Earth orbit (LEO) satellites can harvest delay-tolerant data from remotely located users on Earth without ground infrastructure. This work aims to assess a data harvest network architecture where users generate data
Externí odkaz:
http://arxiv.org/abs/2408.05064
Reconfigurable intelligent surfaces (RISs) provide alternative routes for reflected signals to network users, offering numerous applications. This paper explores an innovative approach of strategically deploying RISs along road areas to leverage vari
Externí odkaz:
http://arxiv.org/abs/2408.04990
Publikováno v:
Journal of Analytical Science and Technology, Vol 15, Iss 1, Pp 1-17 (2024)
Abstract Background Mapping the distribution of bioavailable isotope ratios across landscapes serves as an efficient geochemical tool for delineating the origins and migration trajectories of humans and animals. Chungcheongbuk-do Province in central
Externí odkaz:
https://doaj.org/article/a113e08ca0b8442ba9a69db9c8c97242
Autor:
Choi, Chang-Sik, Baccelli, François
To model existing or future low Earth orbit (LEO) satellite networks leveraging multiple constellations, we propose a simple analytical approach to represent the clustering of satellites on orbits. More precisely, we develop a variable-altitude Poiss
Externí odkaz:
http://arxiv.org/abs/2301.02469
Autor:
Choi, Chang-Sik, Baccelli, François
This work develops an analytical framework for downlink low Earth orbit (LEO) or medium Earth orbit (MEO) satellite communications, leveraging tools from stochastic geometry. We propose a tractable approach to the analysis of such satellite communica
Externí odkaz:
http://arxiv.org/abs/2212.03549
Autor:
Seok, Jinwuk, Cho, Chang Sik
In this study, we propose a global optimization algorithm based on quantizing the energy level of an objective function in an NP-hard problem. According to the white noise hypothesis for a quantization error with a dense and uniform distribution, we
Externí odkaz:
http://arxiv.org/abs/2211.03972
Publikováno v:
Tomography, Vol 10, Iss 7, Pp 1159-1167 (2024)
Objective: The purpose of this study was to evaluate the incidence of gonadal vein refluxes associated with lower-extremity varicose veins with Doppler ultrasonography (DUS). Method: A total of 6279 patients with venous disease-related symptoms of th
Externí odkaz:
https://doaj.org/article/b0b946ff1e62444aacb7856a573ef68c