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Search Results: 1 - 10 of 22119 matches for " Gye Song Cho "
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Natural Killer Cells from Patients with Chronic Rhinosinusitis Have Impaired Effector Functions
Ji Heui Kim, Gye Eun Kim, Gye Song Cho, Hyung-Joon Kwon, Chul Hyun Joo, Hun Sik Kim, Yong Ju Jang
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0077177
Abstract: Natural killer (NK) cells are multicompetent lymphocytes of the innate immune system that play a central role in host defense and immune regulation. Although increasing evidence suggests that innate immunity plays a key role in the pathogenesis of chronic rhinosinusitis (CRS), the role of NK cells in CRS has been poorly studied. This study aimed to characterize the peripheral blood NK cells from patients with CRS, and to compare the functions of these cells with those from non-CRS controls. The correlation between NK cell functional activity and prognosis was also assessed. Eighteen CRS patients and 19 healthy non-CRS controls were included. The patients with CRS were classified into two subgroups, namely a treatment-responsive group and recalcitrant group. NK cell degranulation was determined by measuring the cell surface expression of CD107a against 721.221 and K562 cells. Intracytoplasmic cytokine production was determined by flow cytometry. Compared to the controls, the NK cells of CRS group had an impaired ability to degranulate and to produce cytokines such as IFN-γ and TNF-α. The recalcitrant subgroup showed the most severe defects in NK cell effector functions. Moreover, the decreased NK cell functions in patients with CRS were associated with poor prognostic factors such as concomitant asthma and peripheral blood eosinophilia. NK cells, which were originally named for their ability to mediate spontaneous cytotoxicity towards diseased cells including infected cells, may play an important role in regulating the inflammatory process in CRS pathogenesis.
TIME-DEPENDENT STRENGTH BEHAVIORS OF PRE-GROUTED ZONES IN HAN RIVER CROSSING TUNNEL
韩江河底隧道预灌浆区的强度时间相关特性

Ki-Il Song,Joowon Kim,Gye-Chun Cho,Eun-Soo Hong,
宋基一
,金珠元,赵启春,洪恩秀

岩石力学与工程学报 , 2007,
Abstract: Grouting technology is used in subsea and river-crossing tunnels for various purposes such as waterproofing, pre-reinforcement and corrosion protection. Cement is a general grouting material that has strong time-dependent behaviors. A method to characterize the time-dependent behaviors of pre-grouted zones around a river-crossing tunnel using elastic waves is suggested,and a method for the analysis of time-dependent effects on river-crossing tunnels based on numerical simulation is proposed. First,an experimental analysis was performed to characterize the time-dependent behaviors of the grouted material. Then,the obtained results from laboratory tests were applied to the numerical simulation of a tunnel taking into account its construction sequences. From the result,it can be concluded that the stiffness and strength of pre-grouted zones with 2-7 days are appropriate to model the time-dependent behaviors of a river-crossing tunnel. Finally,the suggested analytical method of combining experimental and numerical simulations that consider the time-dependent effects on the pre-grouted zone on the tunnel behaviors can provide reliable and practical design and analysis for a river-crossing tunnel.
Submarine Slope Failure Primed and Triggered by Bottom Water Warming in Oceanic Hydrate-Bearing Deposits
Tae-Hyuk Kwon,Gye-Chun Cho
Energies , 2012, DOI: 10.3390/en5082849
Abstract: Many submarine slope failures in hydrate-bearing sedimentary deposits might be directly triggered, or at least primed, by gas hydrate dissociation. It has been reported that during the past 55 years (1955–2010) the 0–2000 m layer of oceans worldwide has been warmed by 0.09 °C because of global warming. This raises the following scientific concern: if warming of the bottom water of deep oceans continues, it would dissociate natural gas hydrates and could eventually trigger massive slope failures. The present study explored the submarine slope instability of oceanic gas hydrate-bearing deposits subjected to bottom water warming. One-dimensional coupled thermal-hydraulic-mechanical (T-H-M) finite difference analyses were performed to capture the underlying physical processes initiated by bottom water warming, which includes thermal conduction through sediments, thermal dissociation of gas hydrates, excess pore pressure generation, pressure diffusion, and hydrate dissociation against depressurization. The temperature rise at the seafloor due to bottom water warming is found to create an excess pore pressure that is sufficiently large to reduce the stability of a slope in some cases. Parametric study results suggest that a slope becomes more susceptible to failure with increases in thermal diffusivity and hydrate saturation and decreases in pressure diffusivity, gas saturation, and water depth. Bottom water warming can be further explored to gain a better understanding of the past methane hydrate destabilization events on Earth, assuming that more reliable geological data is available.
Packet-Scheduling Algorithm by the Ratio of Transmit Power to the Transmission Bits in 3GPP LTE Downlink
Jungsup Song,Gye-Tae Gil,Dong-Hoi Kim
EURASIP Journal on Wireless Communications and Networking , 2010, DOI: 10.1155/2010/251281
Abstract: Packet scheduler plays the central role in determining the overall performance of the 3GPP long-term evolution (LTE) based on packet-switching operation. In this paper, a novel minimum transmit power-based (MP) packet-scheduling algorithm is proposed that can achieve power-efficient transmission to the UEs while providing both system throughput gain and fairness improvement. The proposed algorithm is based on a new scheduling metric focusing on the ratio of the transmit power per bit and allocates the physical resource block (PRB) to the UE that requires the least ratio of the transmit power per bit. Through computer simulation, the performance of the proposed MP packet-scheduling algorithm is compared with the conventional packet-scheduling algorithms by two primary criteria: fairness and throughput. The simulation results show that the proposed algorithm outperforms the conventional algorithms in terms of the fairness and throughput.
Packet-Scheduling Algorithm by the Ratio of Transmit Power to the Transmission Bits in 3GPP LTE Downlink
Song Jungsup,Gil Gye-Tae,Kim Dong-Hoi
EURASIP Journal on Wireless Communications and Networking , 2010,
Abstract: Packet scheduler plays the central role in determining the overall performance of the 3GPP long-term evolution (LTE) based on packet-switching operation. In this paper, a novel minimum transmit power-based (MP) packet-scheduling algorithm is proposed that can achieve power-efficient transmission to the UEs while providing both system throughput gain and fairness improvement. The proposed algorithm is based on a new scheduling metric focusing on the ratio of the transmit power per bit and allocates the physical resource block (PRB) to the UE that requires the least ratio of the transmit power per bit. Through computer simulation, the performance of the proposed MP packet-scheduling algorithm is compared with the conventional packet-scheduling algorithms by two primary criteria: fairness and throughput. The simulation results show that the proposed algorithm outperforms the conventional algorithms in terms of the fairness and throughput.
Design Methodology of a 32-bit Arithmetic Logic Unit with an Adaptive Leaf-cell Based Layout Technique
Kiseon Cho,Minkyu Song
VLSI Design , 2002, DOI: 10.1080/10655140290011050
Abstract: In general, an arithmetic logic unit (ALU) of a DSP core is composed of an adder, multiplier and shifter. In order to obtain a high-performance 32-bit ALU, in this paper, an adaptive leaf-cell based layout technique is proposed. Thus novel architectures of 64-bit adder, 32 × 32-bit multiplier, and 32-bit shifter are proposed. The architecture of the proposed 64-bit adder is based on the conditional select addition with regular adaptive multiplexers. Secondly, novel optimized data compressors with a compound logic are proposed in a 32 × 32-bit multiplier. Finally, a shift algorithm with a pre-mask decoder is proposed for the 32-bit barrel shifter. They have been fabricated with 0.25 μm 1-poly 5-metal CMOS process, and we have obtained desired experimental results.
Prediction of Cutting Force and Tool Deflection in Micro Flat End Milling
Hye-Ri Gye,Byeong-Uk Song,Yong-Seok Lim,Yong-Wook Shin
International Journal of Materials, Mechanics and Manufacturing , 2013, DOI: 10.7763/ijmmm.2013.v1.3
Abstract: This paper presents an investigation of prediction of cutting force and tool deflection in micro flat end milling. To predict cutting forces specific cutting force coefficients KT and KR were used. In fact, various cutting forces prediction models were proposed in past researches for conventional sized machining processes. However, micro end-milling processes were known as different phenomenon as respect to macro end-milling. Many past researches concerned complicated different models for micro end-milling from macro end-milling. However, cutting force models for both macro and micro end milling were fundamentally based on measured cutting forces for a series of experimental machining processes. Then, cutting force model proposed by Tlusty, which was developed for macro end-milling, was applied for micro flat end milling because this model is relatively simple. Finite element method was used to predict tool deflection based on predicted cutting forces. Predicted tool deflection amounts and actual machined profiles were compared each other in order to check out the differences between them.
Some thoughts on the evolution of digital media studies
Lisa Gye
Fibreculture Journal , 2007,
Abstract: From networked Doom to social media, this article traces the writer's experience of teaching digital media studies over the past 15 years. While some other fields of academia meander along changing in increments and gentle undulating forays into new fields of enquiry, new media studies hurtles along like a Atari game on an emulator without Speed Throttling and Auto Frameskip. Keeping up is not the only concern - slowing the frame down long enough to establish a research target is often impossible. By way of a series of blog style vignettes, the article tries to indentify some key moments when the target came briefly into view.
How can you be found when no-one knows you’re missing?
Lisa Gye
Fibreculture Journal , 2009,
Abstract: Try to imagine Wolf Creek with an Australia style marketing and tourism campaign. The John Jarratt action figure. Milk cartons proclaiming The Thrill Is In The Hunt. Such an imagining invites us to ponder the capacity of a ‘national cinema’ to reflect or refract ‘national identity’. It allows us to ask whether the idea of a ‘national cinema’ is relevant (or in fact ever was) in a world where the rapid and global circulation of images ensures that we are never able to control or distil them into any kind of meaningful semiotic assemblage for very long. In such a world, is national identity anything more than a marketing strategy? These ideas are explored in this article by way of the reflexive remix in order to examine, more broadly, the functioning of reflexive remix as a mode of critical discourse. Can reflexive remix perform criticism, an applied grammatological critique? Drawing on and remixing the writings of Greg Ulmer, Jacques Derrida and Marshall McLuhan, the author argues for a positive response to such questions.
Halflives, A Mystory: Writing Hypertext to Learn
Lisa Gye
Fibreculture Journal , 2003,
Abstract: This paper outlines an approach to online learning that focuses on the online writing environment as an apparatus of electracy rather than as a medium for the delivery of course materials via online learning systems. Using the Halflives web project as a case study, I argue that taking Ulmer's approach to mystoriographical learning can change the ways in which we think about learning and teaching both off and online.
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