Search results for: Kyu-Hwan Lee

Items from 1 to 20 out of 81 results

article

Single-Walled Carbon Nanotube-Based Chemi-Capacitive Sensor for Hexane and Ammonia

Seil Kim, Kyu-Hwan Lee, Ju-Yul Lee, Kyoung-Kook Kim, more

Electronic Materials Letters > 2019 > 15 > 6 > 712-719

Two configurations of single-walled carbon nanotube-based chemi-capacitive gas sensors were fabricated, i.e., horizontal and vertical. Further, their sensing properties for hexane and ammonia (NH₃) vapor were characterized and compared with chemi-resistive-type sensing properties. Upon exposure to hexane and NH₃ vapor, both capacitance and resistance varied as the analyte concentration increased....

article

Rigid reflections and Kac-Moody algebras

Kyu-Hwan Lee, Kyungyong Lee

Science China Mathematics > 2019 > 62 > 7 > 1317-1330

Given any Coxeter group, we define rigid reflections and rigid roots using non-self-intersecting curves on a Riemann surface with labeled curves. When the Coxeter group arises from an acyclic quiver, they are related to the rigid representations of the quiver. For a family of rank 3 Coxeter groups, we show that there is a surjective map from the set of reduced positive roots of a rank 2 Kac-Moody...

article

Target BER selection scheme in LMS networks using AL-FEC systems

Kyu-Hwan Lee, Dong-Hyuk Jang, Sung-Jae Lee, Jae-Ryong Cha

Computer Networks > 2017 > 127 > C > 190-199

A land mobile satellite (LMS) system is helpful to various fields such as commercial and military applications thanks to its coverage, flexibility, broadcast capability, costs independent on the distance and easy deployment. Besides, since the low data and voice services can be provided via the hand-held terminal, the availability of the LMS system has been increasing. For deep shadowing and non-line-of-sight...

chapter

File transfer framework with multipath transfer in heterogeneous networks for disaster recovery

Kyu-Hwan Lee, Dong-Hyuk Jang, Sung-Jae Lee

2017 19th Asia-Pacific Network Operations and Management Symposium (APNOMS) > 251 - 254

2017 19th Asia-Pacific Network Operations and Management Symposium (APNOMS)

In the disaster recovery process, sufficient data rate and connectivity should be needed. Thus, in this paper, we propose a file transfer framework with multipath transfer in heterogeneous networks for disaster recovery. We first address design considerations for multipath transfer in disaster recovery. In the proposed framework, we consider the primary link (the satellite link) and the auxiliary...

article

Defect engineering toward strong photocatalysis of Nb-doped anatase TiO2: Computational predictions and experimental verifications

Sovann Khan, Haneol Cho, Donghun Kim, Sang Soo Han, more

Applied Catalysis B: Environmental > 2017 > 206 > C > 520-530

Understanding the roles of point defects in optical transitions is a key to the desirable engineering of photochemical materials. In this study, the origins of the significantly varying optical and photochemical properties of Nb-doped anatase TiO₂ were systematically investigated, using density functional theory (DFT) calculations and experimental verifications. We found from DFT calculations that...

article

Representations of spin quiver Hecke algebras for orthosymplectic Lie superalgebras

Konstantina Christodoulopoulou, Kyu-Hwan Lee

Journal of Pure and Applied Algebra > 2016 > 220 > 11 > 3733-3751

We construct all the irreducible representations of spin quiver Hecke algebras for orthosymplectic Lie superalgebras osp(1|2n), and show that their highest weights are given by the dominant words. We use the dominant Lyndon words to construct the cuspidal modules and show that the irreducible representations are the simple heads of standard representations constructed by induction from the cuspidal...

chapter

Adaptive PEP based on location information for SOTM networks

Kyu-Hwan Lee, Dong-Hyuk Jang, Yong-Sun Kim, Sung-Jae Lee

2016 International Conference on Information and Communication Technology Convergence (ICTC) > 211 - 213

2016 International Conference on Information and Communication Technology Convergence (ICTC)

In this paper, we propose an adaptive performance enhancing proxy (A-PEP) based on location information for satellite communication on the move (SOTM) networks. In particular, we propose an adaptive selection algorithm for the transport protocol to maximize the resource efficiency without reducing the goodput in SOTM environments. The simulation results indicate that the proposed A-PEP can maximize...

article

Efficient AL-FEC Mechanism Aided by Navigation Systems for SOTM Systems

Kyu-Hwan Lee, Jae-Hyun Kim

IEEE Transactions on Wireless Communications > 2016 > 15 > 10 > 6651 - 6661

Satellite communications on the move (SOTM) systems are useful for many commercial and military applications, because they support network connectivity and mobility in very large geographical areas. However, SOTM systems suffer from channel blockage because of pointing errors of the antenna and shadowing by obstructions. This channel blockage reduces the network throughput. In this paper, we address...

article

Eisenstein series on rank 2 hyperbolic Kac–Moody groups

Lisa Carbone, Kyu-Hwan Lee, Dongwen Liu

Mathematische Annalen > 2017 > 367 > 3-4 > 1173-1197

We define Eisenstein series on rank 2 hyperbolic Kac–Moody groups over $$\mathbb {R}$$ R , induced from quasi–characters. We prove convergence of the constant term and hence the almost everywhere convergence of the Eisenstein series. We define and calculate the degenerate Fourier coefficients. We also consider Eisenstein series induced from cusp forms and show that these are entire functions.

article

Power saving mechanism with network coding in the bottleneck zone of multimedia sensor networks

Kyu-Hwan Lee, Jae-Hyun Kim, Sunghyun Cho

Computer Networks > 2016 > 96 > C > 58-68

Power consumption is one of the most important issues for the lifetime of a wireless sensor network (WSN). Specifically, the lifetime of a WSN depends on the power consumption of the nodes in the bottleneck zone near each sink node, where all sensing data is collected via the nodes in the bottleneck. However, these nodes’ energy is depleted very quickly because of the heavy traffic imposed on them...

article

Multi-way relay system with network coding in multi-spot beam satellite networks

Kyu-Hwan Lee, Jae-Hyun Kim

Wireless Networks > 2017 > 23 > 1 > 205-217

In this paper, we consider a multi-way relay system with network coding (NC) in multi-spot beam satellite networks. In particular, we focus on multiparty video conferencing via a satellite. Our proposed protocol uses the multicasting routing information and number of video frame packets to generate coded packets. The proposed protocol ensures the reliable transmission of multicasting data for mobile...

article

Size Controlled Synthesis of Tellurium Nanorices by Galvanic Displacement Reaction of Aluminum

Tingjun Wu, Lawrence Youngjae Myung, Miluo Zhang, Kyu-Hwan Lee, more

Electrochimica Acta > 2015 > 176 > C > 1382-1392

Tellurium nanostructures were synthesized by galvanic displacement reaction (GDR) of aluminum in an alkaline solution containing TeO₃²⁻ ions. Due to negative redox potential of Al/AlO₂⁻ (i.e., −2.50V vs. sat. Ag/AgCl), TeO₃²⁻ (+IV) can be reduced to Te₂²⁻ (-I) and Te²⁻ (-II), which resulted in the deposition of Te (0) nanostructures in the solution via chemical reaction between Te₂²⁻ or Te²⁻ and TeO...

article

Electrodeposition of thermoelectric Bi2Te3 thin films with added surfactant

Youngsup Song, In-Joon Yoo, Na-Ri Heo, Dong Chan Lim, more

Current Applied Physics > 2015 > 15 > 3 > 261-264

Bismuth telluride (Bi₂Te₃) thin films were electrodeposited at room temperature from nitric baths in the presence of a surfactant, cetyltrimethylammonium bromide (CTAB). Nearly stoichiometric Bi₂Te₃ thin films were obtained from electrolytes containing 7.5 mM Bi(NO₃)₃. The surface morphology and mechanical properties of the electrodeposited thin film were improved by the addition of CTAB to the electrolyte,...

article

Transfer time analysis of file transfer framework with AL-FEC in SOTM networks

Kyu-Hwan Lee, Jong-Mu Kim, Jae-Hyun Kim

EURASIP Journal on Wireless Communications and Networking > 2015 > 2015 > 1 > 1-8

In this paper, we propose a fully reliable file-transfer framework with application layer forward error correction (AL-FEC) in satellite communications on the move (SOTM) systems. In particular, the proposed framework uses a two-way acknowledgement (ACK) exchange mechanism. The proposed framework is implemented into a performance-enhancing proxy to minimize the system change. Furthermore, we analyze...

article

Synthesis of Tellurium Heterostructures by Galvanic Displacement Reaction of Zinc in Alkaline Baths

Tingjun Wu, Miluo Zhang, Kyu-Hwan Lee, Se-il Kim, more

Electrochimica Acta > 2014 > 150 > Complete > 298-307

Tellurium (Te) nanostructures, including nanowires and branched nanorods, were synthesized by galvanic displacement reaction (GDR) of zinc foils in alkaline baths containing TeO ₃ ²⁻ ions. The dimension, morphology, and crystal structure of the Te nanostructures were controlled by varying the electrolyte composition, pH, and the reaction temperature. For examples, single crystalline Te...

chapter

Cross-layer design for TCP splitting connections with network coding in DVB-RCS networks

Kyu-Hwan Lee, Jae-Hyun Kim

2014 International Conference on Information and Communication Technology Convergence (ICTC) > 970 - 973

2014 International Conference on Information and Communication Technology Convergence (ICTC)

In this paper, we propose a cross-layer design for transmission control protocol (TCP) splitting connections with network coding in digital video broadcasting-return channel via satellite (DVB-RCS) networks. In particular, we propose not only a cross-layer architecture for interaction between TCP and the resource allocation (RA) scheme in the link layer but also a tuning algorithm for the TCP contention...

article

Rank 2 symmetric hyperbolic Kac–Moody algebras and Hilbert modular forms

Henry H. Kim, Kyu-Hwan Lee

Journal of Algebra > 2014 > 407 > Complete > 81-104

In this paper we study rank 2 symmetric hyperbolic Kac–Moody algebras H(a) with the Cartan matrices (2−a−a2), a⩾3, and their automorphic correction in terms of Hilbert modular forms. We associate a family of H(a)'s to the quadratic field Q(p) for each odd prime p and show that there exists a chain of embeddings in each family. When p=5,13,17, we show that the first H(a) in each family, i.e. H(3),...

article

Performance evaluation of network coding in IEEE 802.11 wireless ad hoc networks

Kyu-Hwan Lee, Sunghyun Cho, Jae-Hyun Kim

Ad Hoc Networks > 2014 > 16 > Complete > 131-141

We evaluate the practical network coding (NC) gain in a wireless ad hoc networks. First, we introduce how network coding can be applied to IEEE 802.11 ad hoc networks. Next, we find obstructive factors by which the NC gain may decrease as compared with the theoretical NC gain. Finally, through the performance evaluation, we analyze why a performance difference occurs between practical and theoretical...

article

Electrospun Polyaniline/Poly(ethylene oxide) Composite Nanofibers Based Gas Sensor

Changling Li, Nicha Chartuprayoon, Wayne Bosze, Karen Low, more

Electroanalysis > 26 > 4 > 711 - 722

Camphor‐10‐sulfonic acid (HCSA) doped polyaniline (PANI)/poly(ethylene oxide) (PEO) composite nanofibers with different compositions (12 to 52 wt.% of PANI) were synthesized by an electrospinning method and their properties including optical, electrical and sensing were systematically investigated. FT‐IR shows that an increase of IR absorbance ratios of aromatic CC stretching vibration of benzenoid...

article

Electrodeposition of BixTey thin films for thermoelectric application

In-Joon Yoo, Nosang V. Myung, Dong Chan Lim, Youngsup Song, more

Thin Solid Films > 2013 > 546 > Complete > 48-52

Electrochemically deposited bismuth telluride (Bi _x Te _y ) thin films were grown from nitric acid baths on sputtered Au/Ni/Si substrates. The film compositions and morphology were strongly dependent on the deposition conditions. Surface morphologies varied from granular to needle-like structures depending on the Te content of the films. The power factor improved with the increase of...

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INFONA - science communication portal

Search results for: Kyu-Hwan Lee

Single-Walled Carbon Nanotube-Based Chemi-Capacitive Sensor for Hexane and Ammonia

Rigid reflections and Kac-Moody algebras

Target BER selection scheme in LMS networks using AL-FEC systems

File transfer framework with multipath transfer in heterogeneous networks for disaster recovery

Defect engineering toward strong photocatalysis of Nb-doped anatase TiO2: Computational predictions and experimental verifications

Representations of spin quiver Hecke algebras for orthosymplectic Lie superalgebras

Adaptive PEP based on location information for SOTM networks

Efficient AL-FEC Mechanism Aided by Navigation Systems for SOTM Systems

Eisenstein series on rank 2 hyperbolic Kac–Moody groups

Power saving mechanism with network coding in the bottleneck zone of multimedia sensor networks

Multi-way relay system with network coding in multi-spot beam satellite networks

Size Controlled Synthesis of Tellurium Nanorices by Galvanic Displacement Reaction of Aluminum

Electrodeposition of thermoelectric Bi2Te3 thin films with added surfactant

Transfer time analysis of file transfer framework with AL-FEC in SOTM networks

Synthesis of Tellurium Heterostructures by Galvanic Displacement Reaction of Zinc in Alkaline Baths

Cross-layer design for TCP splitting connections with network coding in DVB-RCS networks

Rank 2 symmetric hyperbolic Kac–Moody algebras and Hilbert modular forms

Performance evaluation of network coding in IEEE 802.11 wireless ad hoc networks

Electrospun Polyaniline/Poly(ethylene oxide) Composite Nanofibers Based Gas Sensor

Electrodeposition of BixTey thin films for thermoelectric application

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