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이수진,박민정,김나희,서승현,Soojin Lee,Min-Jeong Park,Na-Hee Kim,Seung-Hyun Seo 한국정보처리학회 2023 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.12 No.7
공유 전동킥보드의 사용이 급증하면서 공유 모빌리티의 불법 주차 사례가 많이 발생하고 있다. 이 문제를 해결하기 위해 지자체에서는 불법 주차된 공유 전동킥보드 견인 등의 조치를 취하고 있지만 악의적인 이용자에 대한 관리는 이루어지지 않고 있으며 비효율적인 방안이다. 이에 따라 본 논문에서는 블록체인 기반의 공유 전동킥보드 이용자 관리 모델을 제안한다. 공유 전동킥보드에는 주차 상태를 확인할 수 있는 카메라 센서, GPS 등이 탑재되어 있으며 이용자가 공유 전동킥보드 이용을 종료를 하게 되면 반납 시 주차 상태에 대한 정보를 탑재된 센서들을 통해 수집하여 공유 전동킥보드 회사가 이용자가 올바르게 주차했는지 확인할 수 있다. 또한 이용자의 주차 내역에 따라 신뢰점수를 부여하고 신뢰점수에 따라 인센티브를 지급하여 이용자가 스스로 공유 전동킥보드를 올바르게 반납할 수 있도록 유도한다. 해당 정보들은 공유 전동킥보드 회사들이 참여하는 컨소시엄 블록체인을 통해 공유되어 공유 전동킥보드 회사들의 통합적인 이용자 관리가 가능하다. As the use of shared electric kickboards is rapidly increasing, there are many cases of illegal parking of shared mobility. In order to solve this problem, local governments are taking measures such as towing illegally parked shared electric kickboards, but user management is not considered and the methods are inefficient. Accordingly, in this paper, we propose a blockchain-based shared electric kickboard user management model. The shared electric kickboard is equipped with a camera sensor and GPS that can check the parking status, and when the user ends the use of the shared electric kickboard, information on the parking status is collected through the installed sensors and the shared electric kickboard company You can check if the user has parked correctly. In addition, trust points are given according to the user's parking history and incentives are provided according to the trust points, inducing users to return the shared evangelism kickboard correctly. The information is shared through the consortium blockchain in which shared electric kickboard companies participate, enabling integrated user management of shared electric kickboard companies.
Park, Minwoo,Im, Jungkyun,Shin, Minkwan,Min, Yuho,Park, Jaeyoon,Cho, Heesook,Park, Soojin,Shim, Mun-Bo,Jeon, Sanghun,Chung, Dae-Young,Bae, Jihyun,Park, Jongjin,Jeong, Unyong,Kim, Kinam Nature Pub. Group 2012 Nature nanotechnology Vol.7 No.12
<P>Conductive electrodes and electric circuits that can remain active and electrically stable under large mechanical deformations are highly desirable for applications such as flexible displays, field-effect transistors, energy-related devices, smart clothing and actuators. However, high conductivity and stretchability seem to be mutually exclusive parameters. The most promising solution to this problem has been to use one-dimensional nanostructures such as carbon nanotubes and metal nanowires coated on a stretchable fabric, metal stripes with a wavy geometry, composite elastomers embedding conductive fillers and interpenetrating networks of a liquid metal and rubber. At present, the conductivity values at large strains remain too low to satisfy requirements for practical applications. Moreover, the ability to make arbitrary patterns over large areas is also desirable. Here, we introduce a conductive composite mat of silver nanoparticles and rubber fibres that allows the formation of highly stretchable circuits through a fabrication process that is compatible with any substrate and scalable for large-area applications. A silver nanoparticle precursor is absorbed in electrospun poly (styrene-block-butadiene-block-styrene) (SBS) rubber fibres and then converted into silver nanoparticles directly in the fibre mat. Percolation of the silver nanoparticles inside the fibres leads to a high bulk conductivity, which is preserved at large deformations (σ???2,200?S?cm(-1) at 100% strain for a 150-?m-thick mat). We design electric circuits directly on the electrospun fibre mat by nozzle printing, inkjet printing and spray printing of the precursor solution and fabricate a highly stretchable antenna, a strain sensor and a highly stretchable light-emitting diode as examples of applications.</P>
Ultraviolet photodissociation at 266 nm of phosphorylated peptide cations
Park, Soojin,Ahn, Wha-Keun,Lee, Sunyoung,Han, Sang Yun,Rhee, Bum Ku,Oh, Han Bin John Wiley Sons, Ltd. 2009 Rapid communications in mass spectrometry Vol.23 No.23
<P>Ultraviolet (UV) photodissociation (PD) experiments using 266 nm light were performed for a series of phosphopeptide cations in a Fourier transform mass spectrometer. The objective of the experiments was to determine whether 266 nm UV irradiation on the phosphopeptide cations would induce unique peptide backbone dissociation. In addition, the general behavior of the phosphate loss (−80 or −98 Da) was monitored, particularly for those phosphopeptides with a phosphotyrosine residue that itself is a UV chromophore. For phosphopeptides with a UV chromophore, their photodissociation behavior was very similar to that of low-energy sustained off-resonance irradiation collisionally activated dissociation (SORI-CAD), with a few exceptions. For example, b- and y-type peptide backbone fragments were prevalent, and their dephosphorylation behavior was consistent with that of the SORI-CAD results. For phosphoserine peptides, the loss of a phosphate group was always observed. On the other hand, for phosphotyrosine peptides, the phosphate loss was found to be dependent on the presence of a basic amino group in the sequence and the charge state of the precursor ions, in agreement with the CAD results in the literature. However, hydrogen atom loss or aromatic side chain loss, which is known to be the excited state specific fragmentation pathway, was rarely observed in our 266 nm UV PD experiments, in contrast to the previous UV PD literature (particularly at 220 nm). The mechanism for these observations is described in terms of dominant internal conversion followed by intramolecular vibrational energy redistribution (IVR). Copyright © 2009 John Wiley & Sons, Ltd.</P>
Self-Assembly of Block Copolymers on Flexible Substrates
Park, Soojin,Lee, Dong Hyun,Russell, Thomas P. WILEY-VCH Verlag 2010 Advanced Materials Vol.22 No.16
<B>Graphic Abstract</B> <P>A simple route is demonstrated to fabricate highly ordered and oriented arrays of PS-b-PEO block copolymer microdomains on inexpensive, flexible polymeric substrates where the lateral ordering is the same as that seen on hard master surfaces. The block copolymer thin films well-developed onto flexible substrates can be used as templates or scaffolds to fabricate a wide range of nanostructured materials for inexpensive, flexible devices. <img src='wiley_img_2010/09359648-2010-22-16-ADMA200902722-content.gif' alt='wiley_img_2010/09359648-2010-22-16-ADMA200902722-content'> </P>
Soojin Park,Ae-Jung Kim 한국식품영양과학회 2006 Journal of medicinal food Vol.9 No.3
Mulberry fruit (Morus LhouKoidz.), a rich source of the major anthocyanin, cyanidin 3glucoside (C3G), hastraditionally been used for the treatment of inflammatory conditions including rheumatic arthritis. In this study, we evaluatedthe efficacy of orally administrated methanolic mulberry fruit extract (ME) in carrageenan-induced arthritic rats, based on pre-viously observed in vitroantioxidant and anti-inflammatory activities. A significant attenuation of hind paw inflammationcharacterized by fluid accumulation, uric acid production, and rheumatoid factors induced by carrageenan was observed fol-lowing the intake of both ME (50 mg/kg of body weight) and C3G (10 mg/kg of body weight). Moreover, alterations in hema-tological parameters such as serum triglyceride, high-density lipoprotein-cholesterol, and atherogenic index following car-rageenan administration were partially reversed by the administration of ME. It is concluded that dietary mulberry fruit extractselicited protection against carrageenan-induced inflammation.
Park, Soojin,Han, Sang-Uk,Lee, Kee-Myung,Park, Kyung Ha,Cho, Sung Won,Hahm, Ki-Baik Blackwell Science 2007 HELICOBACTER -CAMBRIDGE USA- Vol.12 No.1
<P>Abstract</P><P>Background: </P><P>Arachidonic acid metabolites have been considered as pivotal mediators in <I>Helicobacter pylori</I>-induced inflammatory response, which are mainly metabolized by two distinct enzymes: cyclooxygenase (COX) and lipoxygenase (LOX). While COX has become well known to play a key role in either carcinogenesis or inflammation related to <I>H. pylori</I> infection, little is known regarding the implication of LOX in <I>H. pylori</I> infection. In this study, we evaluated the roles of 5-LOX and its metabolites in <I>H. pylori</I>-induced host responses and further a potential beneficial action of specific LOX inhibitors against <I>H. pylori</I> infection.</P><P>Materials and Methods: </P><P>Expressions of cytosolic phospholipase A<SUB>2</SUB> (cPLA<SUB>2</SUB>), COX-2, and 5-LOX after <I>H. pylori</I> infection were evaluated by immunofluorescence staining and Western blotting. Synthesis of LOX metabolites was measured with reversed-phase high-performance liquid chromatography. For analyzing the influence of 5-LOX inhibitors, nordihydroguaiaretic acid (NDGA) and geraniin, on <I>H. pylori</I>-induced inflammatory responses, RNase protection assay and RT-PCR were performed.</P><P>Results: </P><P><I>H. pylori</I> stimulated the translocation of cPLA<SUB>2</SUB> from cytoplasm to nucleus and increased the biosynthesis of hydroxyeicosatetraenoic acids (HETEs) as a predominant form of 5S-HETE in gastric epithelium. NDGA exerted a strong suppression activity of <I>H. pylori</I>-induced 5-LOX signaling. The administration of LOX inhibitors was related with down-expression of proinflammatory mediators such as interleukin-8 and tumor necrosis factor-α in both <I>H. pylori</I>-infected gastric epithelial cells and macrophage cells.</P><P>Conclusion: </P><P>LOX modulation with its specific inhibitors could impose significant anti-inflammatory responses after <I>H. pylori</I> infection, based on the fact that <I>H. pylori</I> infection provoked gastric inflammation through metabolizing arachidonic acid by the 5-LOX pathway.</P>