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Shin, K.,Jung, T.,Lee, E.,Lee, G.,Goh, Y.,Heo, J.,Jung, M.,Jo, E. J.,Lee, H.,Kim, M. G. Royal Society of Chemistry 2017 Physical chemistry chemical physics Vol.19 No.15
<P>Upconversion nanoparticles (UCNPs) have attracted enormous interest over the past few years because of their unique optical properties and potential for use in various applications such as bioimaging probes, biosensors, and light-harvesting materials for photovoltaics. The improvement of imaging resolution is one of the most important goals for UCNPs used in biological applications. Super-resolution imaging techniques that overcome the fundamental diffraction limit of light rely on the photochemistry of organic dyes or fluorescent proteins. Here we report our progress toward super-resolution microscopy with UCNPs. We found that the red emission (655 nm) of core/shell UCNPs with the structure NaYF4:Yb3+, Er3+/NaYF4 could be modulated by emission depletion (ED) of the intermediate state that interacts resonantly with an infrared beam (1540 nm). In contrast, the green emission bands (525 and 545 nm) of the UCNPs were less affected by irradiation with the infrared beam. The origin of such distinct behaviors between the green and red emissions was attributed to their different photophysical pathways.</P>
Shin, K.,Brennan, M.J.,Joe, Y.G.,Oh, J.E. The Korean Society of Automotive Engineers 2004 International journal of automotive technology Vol.5 No.1
This paper suggests two simple two-degree-of-freedom models to describe the dynamical interaction between the pad and the disc of a disc brake system. Separate models for in-plane and out -of-plane vibration are described. Although a brake pad and disc have many modes of vibration, the interaction between a single mode of each component is considered as this is thought to be crucial for brake noise. For both models, the pad and the disc are connected by a sliding friction interface having a velocity dependent friction coefficient. In this paper, it is shown that this friction model acts as negative damping in the system that describes the in-plane vibration, and as negative stiffness in system that describes the out-of-plane vibration. Stability analysis is performed to investigate the conditions under which the systems become unstable. The results of the stability analysis show that the damping is the most important parameter for in-plane vibration, whereas the stiffness is the most important parameter for the out-of-plane vibration.
Composition-based Cache simulation for structure reorganization
Shin, K.,Han, H.,Choe, K.M. Elsevier 2010 JOURNAL OF SYSTEMS ARCHITECTURE - Vol.56 No.2
Finding the best data layout has been an ultimate goal of memory optimization. Even with data access profile, heuristic algorithms are needed to reorganize data layout for better locality. The best layout could be found by running the given application with all possible data layouts and selecting the best performing layout. This approach, however, can incur too much overhead, particulary when the number of possible layouts are too many. In this paper, we present a composition-based cache simulation for structure reorganization. Instead of running all possible layouts, we simulate only the primary subsets of layouts and compose the cache misses for all layouts by summing up the cache misses of component subsets. Our experiment with the composition-based cache simulation shows that the differences in the cache misses are within 10% of the full cache simulation for 4-way and 8-way set associative caches. In addition to the cache miss estimation, our heuristic algorithm takes account of the extra instruction overhead incurred by structure reorganization. Our experiment with several structure intensive benchmarks shows the 37% reduction in the L1D read misses and the 28% reduction in the L2 read misses. As a result, the execution times are also reduced by 19% on average.
Traffic management strategy for delay-tolerant networks
Shin, K.,Kim, K.,Kim, S. Academic Press 2012 JOURNAL OF NETWORK AND COMPUTER APPLICATIONS - Vol.35 No.6
Messages in delay-tolerant networks (DTNs) are generally classified by relative priority into low, medium, and high priority classes, thus creating challenges in structuring scheduling and drop policies of a traffic management system. This study proposes a novel traffic management strategy for DTNs. The proposed scheme improves message deliveries of different priority classes by utilizing message properties such as estimated total number of replicas, elapsed time, and remaining time-to-live. A delete mechanism of delivered messages is also incorporated to use buffer space efficiently. The performance of the proposed strategy is verified via implementation of a simulation model along with existing scheduling and drop policies and is tested with two well-known real-world trace datasets. The results demonstrate that the proposed strategy yields improved message deliveries of high priority as well as medium and low priority classes.
Shin, K.,Yu, H.,Kim, J. Korean Society of Industrial and Engineering Chemi 2017 Journal of industrial and engineering chemistry Vol.56 No.-
<P>We determine diffusion and partition coefficients of 2-hydroxy-2-methylpropiophenone, a widely used photo-initiator, in nanoporous polydimethylsiloxane network and poly(ethylene glycol) diacrylate solution as model precursor solution. We spectroscopically measure average concentration of 2-hydroxy-2-methylpropiophenone in each media, which is compared to the one estimated from one-dimensional diffusion models to obtain diffusion coefficient. Partition coefficient is obtained by measuring saturated concentration of 2-hydroxy-2-methylpropiophenone in each media. Our results enables predicting concentration of 2-hydroxy-2-methylpropiophenone as it diffuses from precursor solution to crosslinked PDMS, which typically occurs when hydrogel is formed inside microfluidic device via photo polymerization to create nano-structured or micro-structured hydrogel including microfluidic valves. (C) 2017 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Enhanced buffer management policy that utilises message properties for delay-tolerant networks
Shin, K,Kim, S IET 2011 IET COMMUNICATIONS Vol.5 No.6
<P>A delay-tolerant network is a network designed so that temporary or intermittent communication problems and limitations have the least possible adverse impact. Two major issues should be considered to achieve data delivery in such challenging networking environments: a routing strategy for the network and a buffer management policy for each node in the network. The routing strategy determines which messages should be forwarded when nodes meet and the buffer management policy determines which message is purged when the buffer overflows in a node. This study proposes an enhanced buffer management policy that utilises message properties. For maximisation of the message deliveries and minimisation of the average delay, two utility functions are proposed on the basis of message properties, particularly the number of replicas, the age and the remaining time-to-live. The experimental results on two types of well-known real-world mobility trace data and synthetic data show that the proposed buffer management policy yields better results over the history-based drop and traditional policies, such as the shortest lifetime first, the most forwarded first in terms of the number of message deliveries and average delay.</P>