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5G 및 수상드론을 통한 울산항 안전운항 관리 솔루션 및 가상현실 시뮬레이션
김성연 ( Seongyeon Kim ),김연진 ( Yeonjin Kim ),김정수 ( Jeongsu Kim ),황준호 ( Jhunho Hwang ),김정민 ( Jeongmin Kim ) 한국정보처리학회 2020 한국정보처리학회 학술대회논문집 Vol.27 No.2
전체 해양 사고 원인 중 선박 운항 부주의가 34%로 사고 발생 원인 중 대다수를 차지한다. 해당 문제를 해결하기 위해서는 선박 운항자를 대상으로 효과적인 운항 교육 및 실시간 관제 시스템을 제공해 사고를 방지하는 것이 중요하다. 따라서 울산항만을 현실적으로 반영한 가상현실 시물레이션 및 5g 수상드론을 이용한 운항 교육 시스템과 모든 선박들이 사용가능한 실시간 관제 시스템을 연구하고 이를 울산 항만에 제공한다.
Tooth modification for optimizing gear contact of a wind-turbine gearbox
Kim, JeongSu,Park, NoGill,Lee, HyoungWoo Professional Engineering Publishing Ltd 2016 Proceedings of the Institution of Mechanical Engin Vol. No.
<P>This study investigates a method of calculating tooth modification amount of a wind-turbine gearbox. The requirements of high reliability and a service life of 20years or longer for wind power gearboxes necessitate appropriate gear meshes, which require elaborate tooth modification. The interference between teeth caused by deformation of the gear body and the shaft alignment error, which is caused by deformation of system components such as the housing, the bearings, and the shaft, was calculated, and the result was used to determine the tooth modification parameters. Thus, a method of calculating tooth modification amount was developed that can be performed without trial and error; its reliability was confirmed by an evaluation through simulation. Contact was evenly distributed over the tooth surfaces after the tooth profile was corrected, thus improving the edge contact pattern relative to the situation before correction.</P>
Kim, Jeongsu,Hong, Daniel,Lee, Hyungwoo,Shin, Youngki,Park, Sangho,Khang, Yoonho,Lee, Minbaek,Hong, S. American Chemical Society 2013 The Journal of Physical Chemistry Part C Vol.117 No.38
<P>We report the large-scale fabrication of high-performance field effect transistors (FETs) based on pristine semiconducting single-walled carbon nanotube (s-SWCNT) networks without bundles or organic impurities, thus exhibiting its intrinsic characteristics. Here, the solution of pristine s-SWCNTs without bundles or organic impurities was prepared in nonpolar solvent via filtration and centrifugation processes, and the s-SWCNTs in the solution were selectively assembled onto specific regions on the solid substrates via a directed assembly strategy. The fabricated FET devices based on such pristine s-SWCNT networks could exhibit a rather large on–off ratio up to over ∼10<SUP>6</SUP> and a subthreshold swing as small as ∼490 mV/dec, which are comparable to those of a single s-SWCNT-based device with the same device structure. Importantly, the s-SWCNT devices exhibited anomalous gating behaviors such as an on-current saturation at a large gate bias and unconventional scaling behaviors, which are quite different from those of previous SWCNT network-based devices. Such anomalous behaviors can be explained by a simple model based on the networks of contact and CNT resistances, which implies that the anomalous behaviors are, in fact, the intrinsic characteristics of pristine s-SWCNT network-based devices. Our work provides a new insight about the intrinsic characteristics of pristine s-SWCNT network-based devices and, thus, should be an important guideline for the future research and applications of high-performance s-SWCNT network-based devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2013/jpccck.2013.117.issue-38/jp406100n/production/images/medium/jp-2013-06100n_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp406100n'>ACS Electronic Supporting Info</A></P>
Jeongsu KIM,Jungheon LEE 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
The aim of this study is to determine the activity of enzymes by soil microorganisms and to develop a HONO production model according to the change in nitrogen concentration in the soil. Most plants absorb nitrogen in the form of nitrate (NO₃⁻) after ammonium (NH₄⁺) is converted into NO₃⁻ by nitrifying bacteria. The NO₃⁻ is reduced to nitrite (NO₂⁻) by nitrate reductase, which is also reduced to NH₄⁺ by nitrite reductase. It is important for the development of HONO model to measure the concentration of a nitrogen source in the soil. Soil samples were collected from Jeollanam-do area. Quantitative analysis of NH₄⁺ was performed using the indophenol method. For quantitative analysis of NO₂⁻ and NO₃⁻, HPLC analysis at 214 nm (Sphereclone Sax column) was performed. The LOD and LOQ of NO₂⁻ and NO₃⁻ were lower than 0.1 ppm and 0.2 ppm, respectively. The concentration decreased with increasing soil depth. Soil samples from soybean fields had a reduced NO₃⁻ concentration from 111.60 ppm to 46.20 ppm. We plan to complete the HONO emission model by measuring the change in the nitrogen concentration and the activity of related enzymes in Korean soil and estimating the reaction rate constant.
Kim, Soo Jeong,Ryu, Min Jeong,Han, Jeongsu,Jang, Yunseon,Kim, Jungim,Lee, Min Joung,Ryu, Ilhwan,Ju, Xianshu,Oh, Eungseok,Chung, Woosuk,Kweon, Gi Ryang,Heo, Jun Young Academic Press 2017 Biochemical and biophysical research communication Vol. No.
<P><B>Abstract</B></P> <P>The derangement of tyrosine hydroxylase (TH) activity reduces dopamine synthesis and is implicated in the pathogenesis of Parkinson's disease. However, the extracellular modulator and intracellular regulatory mechanisms of TH have yet to be identified. Recently, high-mobility group box 1 (HMGB1) was reported to be actively secreted from glial cells and is regarded as a mediator of dopaminergic neuronal loss. However, the mechanism for how HMGB1 affects TH expression, particularly through the receptor for advanced glycation endproducts (RAGE), has not yet been investigated. We found that recombinant HMGB1 (rHMGB1) upregulates TH mRNA expression via simultaneous activation of JNK phosphorylation, and this induction of TH expression is blocked by inhibitors of RAGE and JNK. To investigate how TH expression levels change through the HMGB1-RAGE axis as a result of MPP<SUP>+</SUP> toxicity, we co-treated SN4741 dopaminergic cells with MPP<SUP>+</SUP> and rHMGB1. rHMGB1 blocked the reduction of TH mRNA following MPP<SUP>+</SUP> treatment without altering cell survival rates. Our results suggest that HMGB1 upregulates TH expression to maintain dopaminergic neuronal function via activating RAGE, which is dependent on JNK phosphorylation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Activation of HMGB1-RAGE stimulates the TH expression in dopaminergic neuron cells. </LI> <LI> HMGB1 regulates TH expression via phosphorylation of JNK. </LI> <LI> HMGB1 rescues the TH expression without alteration of cell viability in MPP<SUP>+</SUP> treated dopaminergic neuron cells. </LI> </UL> </P>
Spontaneous Marangoni Mixing of Miscible Liquids at a Liquid–Liquid–Air Contact Line
Kim, Hyoungsoo,Lee, Jeongsu,Kim, Tae-Hong,Kim, Ho-Young American Chemical Society 2015 Langmuir Vol.31 No.31
<P>We investigate the flow patterns created when a liquid drop contacts a reservoir liquid, which has implications on various physicochemical and biochemical reactions including mixing in microfluidic systems. The localized vortical flow spontaneously triggered by the difference of surface tension between the two liquids is studied, which is thus termed the Marangoni vortex. To quantitatively investigate the strength of vortices, we performed particle image velocimetry (PIV) experiments by varying the surface tension difference, the gap of the flow cell, the density and viscosity of the reservoir liquid, and the size of the drop. A scaling law that balances the interfacial energy of the system with the kinetic energy of the vortical flows allows us to understand the functional dependence of the Marangoni vortex strength on various experimental parameters.</P>