Structural dynamics of keyword networks: Liquid crystal display and plasma display panel cases

Yang, H.,Jung, W.S. Elsevier Science Publishers 2016 Journal of Engineering and Technology Management Vol.40 No.-

<P>This study focuses on understanding scientific evolution by using keyword co-occurrence networks, where keywords appearing in a scientific article are linked with a weight equal to the number of co-occurrences. To characterize structural changes of the network, we examine distributions of sums of weights by node over time. In particular, a change of power-law behavior is utilized to explore scientific evolution, such as emerging scientific paradigms and advancing normal science. As an illustration of the method used, the development of Liquid Crystal Displays (LCDs) and Plasma Display Panels (PDPs) is tracked. We detect two-tiered power-law distributions in the initial stage of scientific growth in both technologies due to differences in research intensity between two groups. The groups of keywords more likely to attract researchers' interest than others are incrementally developed until the mid-2000s to overtake those prior. Finally, we can capture a merging point of the dichotomous structure of PDPs but LCDs maintain the structural separation throughout the adjustment area. We expect that this structural investigation of keyword co-occurrence networks provides an indicator to diagnose the research evolution in that field. (C) 2016 Published by Elsevier B.V.</P>

Identification of body fluid-specific DNA methylation markers for use in forensic science

Park, J.L.,Kwon, O.H.,Kim, J.H.,Yoo, H.S.,Lee, H.C.,Woo, K.M.,Kim, S.Y.,Lee, S.H.,Kim, Y.S. Elsevier Science 2014 FORENSIC SCIENCE INTERNATIONAL GENETICS Vol.13 No.-

DNA methylation, which occurs at the 5'-position of the cytosine in CpG dinucleotides, has great potential for forensic identification of body fluids, because tissue-specific patterns of DNA methylation have been demonstrated, and DNA is less prone to degradation than proteins or RNA. Previous studies have reported several body fluid-specific DNA methylation markers, but DNA methylation differences are sometimes low in saliva and vaginal secretions. Moreover, specific DNA methylation markers in four types of body fluids (blood, saliva, semen, and vaginal secretions) have not been investigated with genome-wide profiling. Here, we investigated novel DNA methylation markers for identification of body fluids for use in forensic science using the Illumina HumanMethylation 450K bead array, which contains over 450,000 CpG sites. Using methylome data from 16 samples of blood, saliva, semen, and vaginal secretions, we first selected 2986 hypermethylated or hypomethylated regions that were specific for each type of body fluid. We then selected eight CpG sites as novel, forensically relevant DNA methylation markers: cg06379435 and cg08792630 for blood, cg26107890 and cg20691722 for saliva, cg23521140 and cg17610929 for semen, and cg01774894 and cg14991487 for vaginal secretions. These eight selected markers were evaluated in 80 body fluid samples using pyrosequencing, and all showed high sensitivity and specificity for identification of the target body fluid. We suggest that these eight DNA methylation markers may be good candidates for developing an effective molecular assay for identification of body fluids in forensic science.

Parasitic robot system for waypoint navigation of turtle

Kim, Dae-Gun,Lee, Serin,Kim, Cheol-Hu,Jo, Sungho,Lee, Phill-Seung Elsevier Science B.V., Amsterdam 2017 JOURNAL OF BIONICS ENGINEERING Vol.14 No.2

<P>In research on small mobile robots and biomimetic robots, locomotion ability remains a major issue despite many advances in technology. However, evolution has led to there being many real animals capable of excellent locomotion. This paper presents a 'parasitic robot system' whereby locomotion abilities of an animal are applied to a robot task. We chose a turtle as our first host animal and designed a parasitic robot that can perform 'operant conditioning'. The parasitic robot, which is attached to the turtle, can induce object-tracking behavior of the turtle toward a Light Emitting Diode (LED) and positively reinforce the behavior through repeated stimulus-response interaction. After training sessions over five weeks, the robot could successfully control the direction of movement of the trained turtles in the waypoint navigation task. This hybrid animal-robot interaction system could provide an alternative solution to some of the limitations of conventional mobile robot systems in various fields, and could also act as a useful interaction system for the behavioral sciences.</P>

Effects of the degree of polymerization on the structure of sodium silicate and aluminosilicate glasses and melts: An ¹⁷O NMR study

Lee, S.K.,Stebbins, J.F. Pergamon Press ; Elsevier Science Ltd 2009 Geochimica et cosmochimica acta Vol.73 No.4

Revealing the atomic structure and disorder in oxide glasses, including sodium silicates and aluminosilicates, with varying degrees of polymerization, is a challenging problem in high-temperature geochemistry as well as glass science. Here, we report <SUP>17</SUP>O MAS and 3QMAS NMR spectra for binary sodium silicate and ternary sodium aluminosilicate glasses with varying degrees of polymerization (Na<SUB>2</SUB>O/SiO<SUB>2</SUB> ratio and Na<SUB>2</SUB>O/Al<SUB>2</SUB>O<SUB>3</SUB> ratio), revealing in detail the extent of disorder (network connectivity and topological disorder) and variations of NMR parameters with the glass composition. In binary sodium silicate glasses [Na<SUB>2</SUB>O-k(SiO<SUB>2</SUB>)], the fraction of non-bridging oxygens (NBOs, Na-O-Si) increases with the Na<SUB>2</SUB>O/SiO<SUB>2</SUB> ratio (k), as predicted from the composition. The <SUP>17</SUP>O isotropic chemical shifts (<SUP>17</SUP>O δ<SUB>iso</SUB>) for both bridging oxygen (BO) and NBO increase by about 10-15ppm with the SiO<SUB>2</SUB> content (for k=1-3). The quadrupolar coupling products of BOs and NBOs also increase with the SiO<SUB>2</SUB> content. These trends suggest that both NBOs and BOs strongly interact with Na; therefore, the Na distributions around BOs and NBOs are likely to be relatively homogenous for the glass compositions studied here, placing some qualitative limits on the extent of segregation of alkali channels from silica-enriched regions as suggested by modified random-network models. The peak width (in the isotropic dimension) and thus bond angle and length distributions of Si-O-Si and Na-O-Si increase with the SiO<SUB>2</SUB> content, indicating an increase in the topological disorder with the degree of polymerization. In the ternary aluminosilicate glasses [Na<SUB>2</SUB>O]<SUB>x</SUB>[Al<SUB>2</SUB>O<SUB>3</SUB>]<SUB>1-x</SUB>SiO<SUB>2</SUB>, the NBO fraction decreases while the Al-O-Si and Al-O-Al fractions apparently increase with increasing Al<SUB>2</SUB>O<SUB>3</SUB> content. The variation of oxygen cluster populations suggests that deviation from ''Al avoidance'' is more apparent near the charge-balanced join (Na/Al=1). The Si-O-Si fraction, which is closely related to the activity coefficient of silica, would decrease with increasing Al<SUB>2</SUB>O<SUB>3</SUB> content at a constant mole fraction of SiO<SUB>2</SUB>. Therefore, the activity of silica may decrease from depolymerized binary silicates to fully polymerized sodium aluminosilicate glasses at a constant mole fraction of SiO<SUB>2</SUB>.

Orbital hybridization mechanism for the enhanced photoluminescence in edge-functionalized sp² carbon clusters

Kang, B.,Choi, Y.,Kim, B.S.,Youn, I.S.,Lee, G. Pergamon Press ; Elsevier Science Ltd 2016 Carbon Vol.109 No.-

<P>Using the first principles methods, we performed systematic study on the effect of edge-functional groups on the electronic energy levels and the optical properties of sp(2) carbon clusters. It is found that the intrinsic pi and pi* orbitals are weakly altered by oxygen-bearing functional groups, but it is significantly disrupted by pyrrolic groups. Thereby the oscillator strength of the lowest-energy transition is found to be much stronger for the pyrrolic group functionalized cluster than for the carboxyl group. From our results being consistent with the experimental reports, we suggest that the photoluminescence enhancement is caused by a perturbation of the intrinsic, frontier molecular orbitals by edge groups. (C) 2016 Elsevier. Ltd. All rights reserved.</P>

An intelligent game by Pushkin: Plot structure and the thematic unity of The 'Tales of Belkin'

김상현 ELSEVIER SCIENCE BV 2006 RUSSIAN LITERATURE Vol.60 No.2

Toll-like receptor 3 mediates UVB-induced MMP-13 and MMP-3 expressions in mice

Yao, C.,Han, S.,Tian, Y.D.,Shin, C.y.,Park, C.H.,Kim, Y.J.,Lee, D.H.,Chung, J.H. Elsevier ; Elsevier Science Pub. Co 2017 Journal of dermatological science Vol.87 No.2

A multiplex PCR system for 13 RM Y-STRs with separate amplification of two different repeat motif structures in DYF403S1a

Lee, E.Y.,Lee, H.Y.,Kwon, S.Y.,Oh, Y.N.,Yang, W.I.,Shin, K.J. ELSEVIER SCIENCE B V AMSTERDAM 2017 FORENSIC SCIENCE INTERNATIONAL GENETICS Vol.26 No.-

<P>In forensic science and human genetics, Y-chromosomal short tandem repeats (Y-STRs) have been used as very useful markers. Recently, more Y-STR markers have been analyzed to enhance the resolution power in haplotype analysis, and 13 rapidly mutating (RM) Y-STRs have been suggested as revolutionary tools that can widen Y-chromosomal application from paternal lineage differentiation to male individualization. We have constructed two multiplex PCR sets for the amplification of 13 RM Y-STRs, which yield small-sized amplicons (<400 bp) and a more balanced PCR efficiency with minimum PCR cycling. In particular, with the developed multiplex PCR system, we could separate three copies of DYF403S1a into two copies of DYF403S1a and one of DYF403S1b1. This is because DYF403S1b1 possesses distinguishable sequences from DYF403S1a at both the front and rear flanking regions of the repeat motif; therefore, the locus could be separately amplified using sequence-specific primers. In addition, the other copy, defined as DYF403S1b by Ballantyne et al., was renamed DYF403S1b2 because of its similar flanking region sequence to DYF403S1b1. By redefining DYF403S1 with the developed multiplex system, all genotypes of four copies could be successfully typed and more diverse haplotypes were obtained. We analyzed haplotype distributions in 705 Korean males based on four different Y-STR subsets: Yfiler, PowerPlex Y23, Yfiler Plus, and RM Y-STRs. All haplotypes obtained from RM Y-STRs were the most diverse and showed strong discriminatory power in Korean population. (C) 2016 Elsevier Ireland Ltd. All rights reserved.</P>

Passenger facility charge vs. airport improvement program funds: A dynamic network DEA analysis for U.S. airport financing

Chang, Y.T.,Park, H.,Zou, B.,Kafle, N. Elsevier Science Ltd ; Pergamon ; Elsevier Science 2016 TRANSPORTATION RESEARCH PART E-LOGISTICS AND TRANS Vol.88 No.-

<P>Passenger Facility Charge (PFC) and the Airport Improvement Program (AIP) are two major sources to finance U.S. airports. This paper develops a novel dynamic network DEA framework to investigate the substitutability between PFC and AIP funds. We find that the studied U.S. airports can substitute PFC for 8-35% of the current AIP funds and contribute significantly to the proposed plan of the US congress to cut AIP funding. In addition, the amount of PFC-for-AIP funds substitution negatively correlates with the productive efficiency of airports. The findings send an important message for future policy reforms on U.S. airport financing. (C) 2016 Elsevier Ltd. All rights reserved.</P>

WITHDRAWN: Spectroscopic characterization of selected functionalized fullerenes - IR absorption and Raman scattering studies

Lewandowska, K.,Barszcz, B.,Graja, A.,Nam, S.Y.,Han, Y.S.,Kim, T.D.,Lee, K.S. Elsevier Science Publishers 2014 Materials chemistry and physics Vol.148 No.3

The Publisher regrets that this article is an accidental duplication of an article that has already been published in <Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 118, (2014) 204 - 209>, http://dx.doi.org/<10.1016/j.saa.2013.08.102>. The duplicate article has therefore been withdrawn. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.