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人工水路에서 模型實驗에 의한 開水路흐름의 水理特性解析 : Ⅱ. 移動床 解析
池洪基,李舜鐸,金成原 嶺南大學校 工業技術硏究所 1997 工業技術硏究所論文集 Vol.25 No.2
In this study, movable bed model testing was carried out in order to analyze bed profile changes and to predict scouring and deposition of bed profile and to hydraulic problems affecting with bed and both-bank between upstream and downstream of intake weir in the study channel. the movable bed model testing consists of fundamental test, numerical analysis test and movable model test, the fundamental test is enforced to analyze relationship of discharge and sediment load in the tilting flume, in order to complement unsolving hard problems during movable model test, numerical analysis test is operated, by I-dimensional bed profile changes model ; HEC-6 model, while the movable model test is operated it is represented for sediment budget to balance exactly between input sediment load and output sediment load, as a result of movable model test, it is presented that scouring and deposition changes in quantities between the upstream and downstream of modification weir were less than those of nature and planning weir. therefore, modification weir will be sustained the stable bed profile changes than any other weirs in the study channel.
Analysis of structural defects in MFI membranes by Fluorescene Confocal Optical Microscopy
Sungwon Hong,Jungkyu Choi,Dongjae Kim,Nakwon Choi,Jaewook Nam 한국막학회 2017 한국막학회 총회 및 학술발표회 Vol.2017 No.05
Defects of zeolite membranes often lower their separation performance. Thus, the investigation of the defects is highly critical in achieving high separation performance. While general characterization methods (e.g. scanning electron microscopy; SEM) that examine the membrane surface cannot detect defects, the FCOM measurement is able to identify the defective structure inside the zeolite membrane using dye molecules of appropriate size [1]. In this work, various dyeing conditions (times and concentrations) were applied to a MFI zeolite membrane in an attempt to investigate the defective structure. Furthermore, the quantitative analysis is practiced to measure the defects in numerical form.
Hong, Sungwon,Kim, Dongjae,Jeong, Yanghwan,Kim, Eunjoo,Jung, Jae Chil,Choi, Nakwon,Nam, Jaewook,Yip, Alex C. K.,Choi, Jungkyu American Chemical Society 2018 Chemistry of materials Vol.30 No.10
<P>It is quite challenging to avoid microdefect formation during hydrothermal growths and/or calcination processes, while manufacturing high-quality zeolite membranes in a reproducible manner. Even less than 1% of defects, which generally provide nonselective pathways, will considerably worsen the intrinsic, high molecular sieving-based separation performance of a continuous zeolite membrane. Herein, we propose a simple and reliable method for blocking defects using water-soluble dye molecules, which were originally used for the visualization of nonzeolitic, defective structures in a zeolite membrane. Because the dye molecules are ∼1 nm in size, they cannot diffuse into the zeolitic pores and selectively access the defects. For the demonstration of dye-based defect healing, we chose a siliceous chabazite type SSZ-13 zeolite membrane (pore size = 0.37 × 0.42 nm<SUP>2</SUP>) with some degree of defects and investigated the effect of defect healing on the final CO<SUB>2</SUB> separation performance. Because the defects were gradually filled by the dye molecules, both CO<SUB>2</SUB>/N<SUB>2</SUB> and CO<SUB>2</SUB>/CH<SUB>4</SUB> separation performances were concomitantly increased. Intriguingly, the CO<SUB>2</SUB> perm-selectivity test with ternary mixtures including H<SUB>2</SUB>O vapor (the third largest component in the flue and natural/shale/bio gas streams) in the feed diminished CO<SUB>2</SUB> separation performance. This could be ascribed to inhibited transport of the fast permeating species, here CO<SUB>2</SUB>, from the adsorbed H<SUB>2</SUB>O molecules on the dye-treated and water-friendly (relatively hydrophilic) membrane surface. On the contrary, the intact, siliceous (water-repelling or hydrophobic) SSZ-13 membranes showed improved CO<SUB>2</SUB> perm-selectivities in the presence of H<SUB>2</SUB>O vapor, seemingly due to defect blocking by the physisorbed H<SUB>2</SUB>O molecules.</P> [FIG OMISSION]</BR>
Accelerated dynamic programming algorithms for a car resequencing problem in automotive paint shops
Hong, Sungwon,Han, Jinil,Choi, Jin Young,Lee, Kyungsik Elsevier 2018 Applied mathematical modelling Vol.64 No.-
<P><B>Abstract</B></P> <P>In this paper, a car resequencing problem (CRP) for automotive paint shops is considered, whereby a set of cars conveyed from an upstream shop to one of the multiple conveyors is retrieved sequentially before the painting operation. The aim of the CRP is to find a car retrieval sequence that minimizes the sequence-dependent changeover cost, which is the cost that is incurred when two consecutive cars do not share the same color. For this problem, we propose accelerated dynamic programming (ADP) algorithms that utilize strong combinatorial lower bounds and effective upper bounds in a standard dynamic programming framework, thus outperforming existing exact algorithms. Testing of our algorithms over a wide range of instances confirmed that they are more efficient than the existing approaches and are also more applicable in practice.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel exact and heuristic algorithms for resequencing cars to minimize setup costs in automotive paint shops are proposed. </LI> <LI> Incorporating strong lower and upper bounds in the dynamic programming framework reduces computation time significantly. </LI> <LI> Proposed algorithms are more efficient than existing approaches and also more practically applicable. </LI> <LI> Shows well-tailored exact algorithms can be more efficient than meta-heuristic algorithms. </LI> </UL> </P>
Additional data transmission with rotated QPSK constellation
Sungwon Hong,Eun Su Kang,Dong Seog Han IET 2015 Electronics letters Vol.51 No.5
<P>A quadrature phase-shift keying (QPSK) modulation scheme is proposed to improve the data rate using the rotated constellation. The additional data is not physically transmitted to improve the spectral efficiency, but it can be detected in the receiver through the rotated phases of constellations. In this Letter, the performance of the proposed transmission scheme is verified by simulation and mathematical analysis with the majority detection rule as the lower bound.</P>
Hong, Sungwon,Lee, Cha Gon Korean Society of Medical Genetics and Genomics 2018 대한의학유전학회지 Vol.15 No.1
Cornelia de Lange syndrome (CdLS) is a rare, clinically and genetically heterogeneous, multi-system developmental disorder caused by mutations in genes that encode components of the cohesin complex. X-linked CdLS caused by an SMC1A mutation is an extremely rare disease characterized by phenotypes milder than those of classic CdLS. In the Republic of Korea, based on a literature review, one family with SMC1A-related CdLS with mild phenotypes has been genetically confirmed to date. In this study, we describe the clinical features of a Korean boy with a hemizygous novel missense mutation and his mother with a heterozygous mutation, i.e., c.2447G>A (p.Arg816His) in SMC1A, identified by multi-gene panel sequencing. The proband had a mild phenotype with typical facial features and his mother exhibited a mild, subclinical phenotype. This study expands the clinical spectrum of patients with X-linked CdLS caused by SMC1A variants. Moreover, these findings reinforce the notion that a dominant negative effect in a carrier female with a heterozygous mutation in SMC1A results in a phenotype milder than that in a male patient with the same mutation.