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Park, Suhyun,Yoon, Donghwan,Bang, Sulgi,Kim, Jongchan,Baik, Hionsuck,Yang, Haesik,Lee, Kwangyeol RSC Pub 2015 Nanoscale Vol.7 No.37
<P>A facile one step route has been developed for the synthesis of trimetallic Cu@RhRu core-shell concave nanooctahedra by co-decomposition of Ru, Rh and Cu precursors. A mechanistic study reveals that nanoparticles with a CuRh alloy core and a Ru shell are initially formed and a subsequent migration of Rh to the shell results in the Cu@RhRu core-shell concave nanooctahedron. The shell exhibits atomically mixed Ru and Rh phases with an fcc atomic structure, although the hcp atomic structure is commonly found for the bulk Ru. We also report an unusually high catalytic activity of the Cu@RhRu octahedral nanocrystals toward the oxygen evolution reaction in alkaline solution.</P>
Machine Learning-based Optimal VNF Deployment
Suhyun Park,Hee-Gon Kim,Jibum Hong,Stanislav Lange,Jae-Hyoung Yoo,James Won-Ki Hong 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
Network Function Virtualization (NFV) environment can deal with dynamic changes in traffic status with appropriate deployment and scaling of Virtualized Network Function (VNF). However, determining and applying the optimal VNF deployment in consideration of the cost and Quality of Service (QoS) is a complicated and difficult task. In particular, it is necessary to predict the situation at a future point when the deployment decision is applied because it takes processing time to apply the deployment decision to the actual NFV environment. In this paper, we randomly generate service requests in Multiaccess Edge Computing (MEC) topology, then obtain optimal VNF deployment and Service Function Chaining (SFC) result from an Integer Linear Programming (ILP) solution. We use the simulation data to train a machine learning model which predicts the optimal VNF deployment at a predefined future point. The prediction model shows the accuracy over 90% compared to the ILP solution for the 5-minute future time point.
Identification of the Phenalamide Biosynthetic Gene Cluster in Myxococcus stipitatus DSM 14675
( Suhyun Park ),( Hyesook Hyun ),( Jong Suk Lee ),( Kyungyun Cho ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.9
Phenalamide is a bioactive secondary metabolite produced by Myxococcus stipitatus. We identified a 56 kb phenalamide biosynthetic gene cluster from M. stipitatus DSM 14675 by genomic sequence analysis and mutational analysis. The cluster is comprised of 12 genes (MYSTI_04318- MYSTI_04329) encoding three pyruvate dehydrogenase subunits, eight polyketide synthase modules, a non-ribosomal peptide synthase module, a hypothetical protein, and a putative flavin adenine dinucleotide-binding protein. Disruption of the MYSTI_04324 or MYSTI_04325 genes by plasmid insertion resulted in a defect in phenalamide production. The organization of the phenalamide biosynthetic modules encoded by the fifth to tenth genes (MYSTI_04320- MYSTI_04325) was very similar to that of the myxalamid biosynthetic gene cluster from Stigmatella aurantiaca Sg a15, as expected from similar backbone structures of the two substances. However, the loading module and the first extension module of the phenalamide synthase encoded by the first to fourth genes (MYSTI_04326-MYSTI_04329) were found only in the phenalamide biosynthetic gene cluster from M. stipitatus DSM 14675.
RESEARCH ON CONSILIENCE IN FASHION PRODUCTS AND CUSTOMER ADOPTION INTENTION
Suhyun Park,Liyan Hung,Heeju Chae,Eunju Ko 글로벌지식마케팅경영학회 2015 Global Fashion Management Conference Vol.2015 No.06
In a period of crisis and uncertainty as the current, heritage marketing is a suitable strategic opportunity because it associates values and meanings to products and services by using corporate heritage or brand heritage in order to communicate identity, continuity and stability. Heritage marketing seems particularly appropriate for high symbolic fashion brand that require the ability to transmit identity and to generate symbolic meanings. In relation to high symbolic fashion brand, an opportunity for heritage marketing strategies is to narrate the myths associated with the brand. In fact, literature has highlighted that fashion brand can be associate to the concept of myth thanks to the presence of symbolic values and meanings. Heritage and myth are concepts linked to time and progression. Therefore, they should continually innovate and evolve in relation to the community of reference in order to find a balance between continuity and renewal. However, a risk of heritage marketing strategies is to merely celebrating the past thus losing the ability to generate and regenerate myths and symbolic values. This paper aims to provide a critical contribution to heritage marketing literature highlighting the risk of obsessive fixation in the celebration of the past. In order to avoid this risk, the paper proposes that a possible solution might be the integration of mythopoesis which is the ability to generate and regenerate myths in order to create and perpetuate sense and meaning through narrative.
A subepithelial lesion in a patient with long-standing ulcerative colitis
Suhyun Park,Jihun Kim,Dong-Hoon Yang 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.5
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Park, Ji Young,Heo, Hyun A,Park, Suhyun,Pyo, Sung Woon Korean Academy of Periodontology 2020 Journal of Periodontal & Implant Science Vol.50 No.2
Purpose: Dental implant-associated medication-related osteonecrosis of the jaw has been frequently reported in patients administered bisphosphonates (BPs) to prevent osteoporosis. The aim of this study was to investigate the effect of intermittent administration of parathyroid hormone (PTH) on peri-implant bone in the maxillae of ovariectomized rats systemically administered BPs. Methods: Thirty 8-week-old female Sprague-Dawley rats were randomly divided into 3 groups. The OVX-ZP group included ovariectomized rats administered 60 ㎍/kg of zoledronate once a week for 6 weeks and 30 ㎍/kg PTH after implant installation. The OVX-Z group included ovariectomized rats administered 60 ㎍/kg of zoledronate once a week for 6 weeks and saline after implant installation, and the control group included rats that underwent a sham operation and were then administered saline. Rats were sacrificed 4 weeks after implant placement for histomorphometric and micro-computed tomography (CT) analyses. Results: The average bone area percentage was greater in the OVX-ZP group than in the OVX-Z group (53.4%±4.0% vs. 28.9%±9.5%, P=0.01). The bone-to-implant contact ratio was 50.8%±1.4% in the OVX-ZP group and 16.9%±2.4% in the OVX-Z group (P=0.012). The average bone volume ratio as shown on micro-CT was 31.3%±19.8% in the OVX-ZP group and 19.4%±9.3% in the OVX-Z group (P=0.045). The OVX-ZP and OVX-Z groups displayed similar trabecular thickness (0.06±0.004 mm vs. 0.06±0.002 mm) (P>0.05) and trabecular separation (0.21±0.02 mm vs. 0.29±0.13 mm) (P>0.05). However, the number of trabeculae in the OVX-ZP group was significantly higher than that in the OVX-Z group (4.3±1.33/㎣ vs. 2.2±0.19/㎣) (P=0.024). Conclusions: The present findings indicate that intermittently-administered PTH can promote peri-implant bone formation and suggest that PTH administration may aid in effective treatment for medication-related osteonecrosis of the jaw after dental implantation.
Park, Suhyun,Lee, Jaegyeong,Jeong, Jong Hwa,Lee, Hyosun,Nayab, Saira Elsevier 2018 Polyhedron Vol.151 No.-
<P><B>Abstract</B></P> <P>Palladium(II) complexes, <B>L<SUB>n</SUB>PdCl<SUB>2</SUB> </B> (L<SUB>n</SUB> = L<SUB>A</SUB>–L<SUB>I</SUB>), with <I>N</I>,<I>N</I>′-bidentate imine ligands derived from picolinaldehyde and substituted anilines have been synthesized and structurally characterized. Molecular structures revealed a distorted square plane geometry around Pd(II) centre in <B>L<SUB>n</SUB>PdCl<SUB>2</SUB> </B> (L<SUB>n</SUB> = L<SUB>A</SUB>–L<SUB>C</SUB>) obtained <I>via</I> coordination with pyridine and imine nitrogens and two chloro ligands. Pd(II) complexes <B>L<SUB>n</SUB>PdCl<SUB>2</SUB> </B> (L<SUB>n</SUB> = L<SUB>A</SUB>–L<SUB>I</SUB>) initiate polymerisation of methylmethacrylate (MMA) in the presence of modified methylaluminoxane (MMAO). The complex <B>L<SUB>I</SUB>PdCl<SUB>2</SUB> </B> (of which the ligand was <I>N</I>-furfuryl substituted) showed the highest catalytic activity for the polymerisation of MMA with an activity of 7.08 × 10<SUP>4</SUP> g PMMA/mol·Pd·h at 60 °C. All the complexes yielded syndio-rich poly(methyl methacrylate) (PMMA) ([<I>rr</I>] = 0.70). Notably, the substituents on the imine moiety of the iminopyridine fragments affects the activities towards MMA polymerization, whereas the stereoselectivities remained unchanged.</P> <P><B>Graphical abstract</B></P> <P>Palladium(II) complexes <B>L<SUB>n</SUB>PdCl<SUB>2</SUB> </B> (L<SUB>n</SUB> = L<SUB>A</SUB>–L<SUB>I</SUB>) with <I>N</I>,<I>N</I>′-bidentate imine ligands derived from picolinaldehyde and substituted anilines have been synthesized and characterized. Pd(II) complexes effectively initiate MMA polymerisation in the presence of MMAO yielding syndio-enriched PMMA. The substituent at imine moiety of iminopyridine framework significantly affect the catalytic activity. Substituents at imine moiety in <B>L<SUB>n</SUB>PdCl<SUB>2</SUB> </B> (L<SUB>n</SUB> = L<SUB>A</SUB>–L<SUB>I</SUB>) play a vital role in controlling their activities toward MMA polymerization.</P> <P>[DISPLAY OMISSION]</P>
Radially Phase Segregated PtCu@PtCuNi Dendrite@Frame Nanocatalyst for the Oxygen Reduction Reaction
Park, Jongsik,Kanti Kabiraz, Mrinal,Kwon, Hyukbu,Park, Suhyun,Baik, Hionsuck,Choi, Sang-Il,Lee, Kwangyeol American Chemical Society 2017 ACS NANO Vol.11 No.11
<P>Pt-based alloy nanoframes have shown great potential as electrocatalysts toward the oxygen reduction reaction (ORR) in fuel cells. However, the intrinsically infirm nanoframes could be severely deformed during extended electro-cyclings, which eventually leads to the loss of the initial catalytic activity. Therefore, the structurally robust nanoframe is a worthy synthetic target. Furthermore, ternary alloy phase electrocatalysts offer more opportunities in optimizing the stability and activity than binary alloy ones. Herein, we report a robust PtCuNi ternary nanoframe, structurally fortified with an inner-lying PtCu dendrite, which shows a highly active and stable catalytic performance toward ORR. Remarkably, the PtCu@PtCuNi catalyst exhibited 11 and 16 times higher mass and specific activities than those of commercial Pt/C.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2017/ancac3.2017.11.issue-11/acsnano.7b04097/production/images/medium/nn-2017-04097w_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn7b04097'>ACS Electronic Supporting Info</A></P>