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The Impact of Network Coding Cluster Size on Approximate Decoding Performance
( Minhae Kwon ),( Hyunggon Park ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.3
In this paper, delay-constrained data transmission is considered over error-prone networks. Network coding is deployed for efficient information exchange, and an approximate decoding approach is deployed to overcome potential all-or-nothing problems. Our focus is on determining the cluster size and its impact on approximate decoding performance. Decoding performance is quantified, and we show that performance is determined only by the number of packets. Moreover, the fundamental tradeoff between approximate decoding performance and data transfer rate improvement is analyzed; as the cluster size increases, the data transfer rate improves and decoding performance is degraded. This tradeoff can lead to an optimal cluster size of network coding-based networks that achieves the target decoding performance of applications. A set of experiment results confirms the analysis.
Distributed Network Formation Strategy for Network Coding Based Wireless Networks
Kwon, Minhae,Park, Hyunggon IEEE Signal Processing Society 2017 IEEE signal processing letters Vol.24 No.4
<P>In this letter, we propose a distributed network formation solution for network coding deployed wireless networks which includes multisource multicast flows. This is an attempt to solve an open problem of network coding based multisource multicast flow design based on a game theoretic approach, which can eventually form a network in a distributed way. The network is in particular constructed by individual decision makings of the nodes, while taking advantages of network coding techniques. The decisions made by the nodes include the transmission powers and the use of network coding operations. In each stage game, nodes update the parameters based on feedbacks such as rewards, penalties, and evaluate their prior actions, which enables the nodes to make best responses in the next stage game. Our simulations confirm that the resulting network can reduce overall power consumption compared to direct transmission, and improve system throughput with less power consumption compared to no coding strategy.</P>
Minha Park,Moon Seok Kang,Geon‑Woo Park,Hyoung Chan Kim,Hyoung‑Seok Moon,Byoungkoo Kim,Jong Bae Jeon,Hyunmyung Kim,Hee‑Sang Park,Se‑Hun Kwon,Byung Jun Kim 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
High-Mn (over 24 wt%) austenitic steels recently have been developed with excellent mechanical properties such as highstrength and ductility at very low temperatures for cryogenic application. Especially, cold-rolling process is and effectivemethod to increased yield and tensile strength of high-Mn steel when making products. In our previous work, we haveinvestigated the correlation between microstructure and mechanical properties due to recrystallization without consideringthe characteristics of the cold-rolling direction of high-Mn steels.In this study, we evaluated the effects of anisotropicbehaviors on the heat treatment of cold-rolling high-Mn steels. Despite the heat treatment, differences between transverseand longitudinal direction in the cold-rolled conditions generally affected the recrystallized microstructure. Such anisotropicbehaviors caused changes in mechanical properties such as tensile and Charpy impact test, as microstructure along coldrollingdirection.
Kim, Minha,Jang, Yong-Jun,Jung, Ho-Sung,Song, Woochang,Kang, Hyunil,Kim, Eung Kwon,Kim, Donguk,Yi, Junsin,Lee, Jaehyeong American Scientific Publishers 2016 Journal of nanoscience and nanotechnology Vol.16 No.5
<P>Aluminum-doped zinc oxide (AZO) thin films were deposited on glass and polyimide substrates using radio frequency magnetron sputtering. We investigated the effects of the oxygen gas ratio on the properties of the AZO films for Cu(In, Ga)Se-2 thin-film solar cell applications. The structural and optical properties of the AZO thin films were measured using X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), and UV-Visible-NIR spectrophotometry. The oxygen gas ratio played a crucial role in controlling the optical as well as electrical properties of the films. When oxygen gas was added into the film, the surface AZO thin films became smoother and the grains were enlarged while the preferred orientation changed from (0 0 2) to (1 0 0) plane direction of the hexagonal phase. An improvement in the transmittance of the AZO thin films was achieved with the addition of 2.5-% oxygen gas. The electrical resistivity was highly increased even for a small amount of the oxygen gas addition.</P>