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Journal of Integrative plant Biology 2022年第3期64卷 625-631页

作者： Min Yong Ahn Dong Hye seo Woo Taek kim Department of Systems Biology Division of Life ScienceYonsei UniversitySeoul 03722Korea Institute of Life Science and Biotechnology Yonsei UniversitySeoul 03722Korea

The mechanism regulating proteasomal activity under proteotoxic stress conditions remains ***,we showed that arsenite-induced proteotoxic stress resulted in upregulation of Arabidopsis homologous pUB22 and pUB23 U-boxE3 ubiquitin ligases and that pub22 pub23 double mutants displayed arsenite-insensitive seed germination and root growth ***22/pUB23 downregulated 26 S proteasome activity by promoting the dissociation of the 19 S regulatory particle from the holo-proteasome complex,resulting in intracellular accumulation of UbG76 VGFp,an artificial substrate of the proteasome complex,and insoluble poly-ubiquitinated *** results suggest that pUB22/pUB23 play a critical role in arsenite-induced proteotoxic stress response via negative regulation of 26 S proteasome integrity.

关键词： Arabidopsis thaliana proteotoxic stress sodium arsenite U-box E3 ligases pUB22/23 26S proteasome complex

Effect of an Artificial Caudal Fin on the performance of a Biomimetic Fish Robot propelled by piezoelectric Actuators

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Journal of Bionic Engineering 2007年第3期4卷 151-158页

作者： seok Heo Tedy Wiguna Hoon Cheol park Nam seo Goo Artificial Muscle Research Center Konkuk UniversitySeoul 143-701Korea Department of Advanced Technology Fusion Konkuk UniversitySeoul 143-701Korea Department of Advanced Technology Fusion Artificial Muscle Research Center and Smart Robot CenterKonkuk UniversitySeoul 143-701Korea

This paper addresses the design of a biomimetic fish robot actuated by piezoeeramic actuators and the effect of artificial caudal fins on the fish robot＇s performance. The limited bending displacement produced by a lightweight piezocomposite actuator was amplified and transformed into a large tail beat motion by means of a linkage system. Caudal fins that mimic the shape of a mackerel fin were fabricated for the purpose of examining the effect of caudal fm characteristics on thrust production at an operating frequency range. The thickness distribution of a real mackerel＇s fin was measured and used to design artificial caudal fins. The thrust performance of the biomimetic fish robot propelled by fins of various thicknesses was examined in terms of the Strouhal number, the Froude number, the Reynolds number, and the power consumption. For the same fm area and aspect ratio, an artificial caudal fin with a distributed thickness shows the best forward speed and the least power consumption.

关键词： LIpCA biomimetic fish robot caudal fro Strouhal number Froude number Reynolds number

Lightweight Super-Resolution Model for Complete Model Copyright protection

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Tsinghua Science and Technology 2024年第4期29卷 1194-1205页

作者： Bingyi Xie Honghui Xu YongJoon Joe Daehee seo Zhipeng Cai Department of Computer Science Georgia State UniversityAtlantaGA 30303USA LSWare Inc. Seoul 08504Republic of Korea College of Intelligence Information Engineering Sangmyung UniversityRepublic of KoreaSeoul 03016

Deep learning based techniques are broadly used in various applications, which exhibit superior performance compared to traditional methods. One of the mainstream topics in computer vision is the image super-resolution task. In recent deep learning neural networks, the number of parameters in each convolution layer has increased along with more layers and feature maps, resulting in better image super-resolution performance. In today’s era, numerous service providers offer super-resolution services to users, providing them with remarkable convenience. However, the availability of open-source super-resolution services exposes service providers to the risk of copyright infringement, as the complete model could be vulnerable to leakage. Therefore, safeguarding the copyright of the complete model is a non-trivial concern. To tackle this issue, this paper presents a lightweight model as a substitute for the original complete model in image super-resolution. This research has identified smaller networks that can deliver impressive performance, while protecting the original model’s copyright. Finally, comprehensive experiments are conducted on multiple datasets to demonstrate the superiority of the proposed approach in generating super-resolution images even using lightweight neural networks.

关键词： lightweight adversarial learning image super-resolution copyright protection

progress in light-to-frequency conversion circuits based on low dimensional semiconductors

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Nano Research 2021年第9期14卷 2938-2964页

作者： Seung Gi seo Seung Yeob kim Jinheon Jeong Sung Hun Jin Department of Electronic Engineering Incheon National UniversityAcademy-ro 119Yeongsu-guIncheon 22012Republic of Korea

As the scaling down of Si devices in the range less than few nm has been expedited up to a physical limit of Si,low dimensional materials have been regarded as one of next generation *** a variety of applications,studies on photodetectors have been actively investigated with their novel optical properties as well as astonishing electrical ***,most of research has focused on single device-type photodetector(i.e.,photo-diode or photo-transistor).Contrary to common photodetector,light-to-frequency circuits(LFCs)are based on frequency reading with photosensitive ring oscillators,which has better noise immunity and reduced system complexity,thus,can be utilized to novel application even in internet of things(loT)and bio&medical *** this review,low dimensional materials based circuit level photodetectors,which are core elements as the form of either inverters or ring oscillators for demonstration of LFCs,are *** with the introduction of low dimensional materials and their optical properties for optoelectronics,a fundamental concept for LFCs is specifically ***,research progress on low dimensional material based photosensitive inverters is addressed according to the types of ***,as one of practical method for the improvement of photodetector performance,molecular doping technology is ***,complete system of LFCs and its digitization for demonstration of production level,and potential application in the respective four aspects,(i)medical SpO_(2) detection,(ii)biological fluidic system,(iii)auto-lighting in agriculture,and(iv)optical feedback and sensing systems,are presented as systematic way to address the envisioned practical applications for the future displays including virtual reality and augmented reality,and *** a remark,LFCs based on low dimensional semiconductors are expected to be one of core components in trillion’s sensor area.

关键词： photodetector light-to-frequency conversion circuit transition metal dichalcogenide carbon nanotube

Microstructural Evolution in Directionally Solidified Ni-Base Superalloy IN792+Hf

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Journal of Materials Science & Technology 2008年第1期24卷 110-114页

作者： S.M.seo I.S.kim J.H.Lee C.Y.Jo H.Miyahara k.Ogi High Temperature Materials Research Group kIMS Changwon641-010Korea Dept.of Metall.& Mater.Eng. Changwon Univ. Changwon641-773Korea Dept.of Mater.Sci.& Eng. kyushu Univ. Fukuoka819-0395Japan Oita National College of Technology Oita 870-0152Japan

Microstructural evolution during directional solidification （DS） of Ni-base superalloy IN792＋Hf has been investigated with an emphasis on theγ′precipitates and MC-type *** quantitative image analyses revealed that the increase in the solidification rate up to 100μm/s at constant thermal gradient of 178 k/cm resulted in a fine and uniform distribution ofγ′*** relationship between the as-castγ′size and cooling rate was also determined for DS IN792＋*** the mean time,the MC carbide size was found to be dependent both on the solidification rate and the S/L interface morphology while the area fraction of MC carbide was significantly influenced by the S/L interface morphology.

关键词： IN792 MC corbide Gamma prime Solidification rate

Spatial analysis of various multiplex cinema types

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Frontiers of Architectural Research 2016年第1期5卷 63-73页

作者： Young-seo park Sungil Ham Samoo Architects & Engineers Seoul 138-240 Republic of Korea School of Mechatronics Gwangju Institute of Science and Technology Gwangju 610005

This study identifies the spatial charactenstics and relationships of each used space according to the multiplex type. In this study, multiplexes are classified according to screen rooms and circulation systems, and each used space is quantitatively analyzed. The multiplex type based on screen rooms and moving line systems influences the relationship and characteristics of each used space in various ways. In particular, the structure of the used space of multiplexes has a significant effect on orofit generation and audience convenience.

关键词： Multiplex Space anatysis Area share Integration Isovist

Suggestion of advanced regression model on friction angle of fault gouge in South korea

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第6期13卷 1368-1379页

作者： seong-Woo Moon Hyun-seok Yun Yong-seok seo Department of Earth and Environmental Sciences Chungbuk National University1 Chungdae-roCheongju-siChungcheongbuk-do28644South Korea

Although friction characteristics of fault gouge are important to understand reactivation of fault,behavior of earthquake,and mechanism of slope failure,analysis results of fault gouge have low accuracy mostly than those of soils or rocks due to its high heterogeneity and low ***,to improve the accuracy of analysis results,we conducted simple regression analysis and structural equation model analysis and selected major influential factors of friction characteristics among many factors,and then we deduced advanced regression model with the highest coefficient of determination(R^(2)) via multiple regression *** most coefficients of determination in simple regression analysis are below0.3-0.4,coefficient of determination in multiple regression analysis is remarkably large as 0.657.

关键词： Fault gouge Friction angle Simple regression analysis Structural equation model analysis Multiple regression analysis

New approaches to water purification for resource- constrained settings： production of activated biochar by chemical activation with diammonium hydrogenphosphate

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Frontiers of Chemical Science and Engineering 2018年第1期12卷 194-208页

作者： Mohit Nahata Chang Y. seo pradeep krishnakumar Johannes Schwank Department of Chemical Engineering University of Michigan-Ann Arbor Ann Arbor MI 48109 USA

A significant portion of the world＇s population does not have access to safe drinking water. This problem is most acute in remote, resource-constrained rural settings in developing countries. Water filtration using activated carbon is one of the important steps in treating con- taminated water. Lignocellulosic biomass is generally available in abundance in such locations, such as the African rain forests. Our work is focused on developing a simple method to synthesize activated biochar from locally available materials. The preparation of activated biochar with diammonium hydrogenphosphate （DAp） as the activating agent is explored under N2 flow and air. The study, carried out with cellulose as a model biomass, provides some insight into the interaction between DAp and biomass, as well as the char forming mechanism. Various characterization techniques such as N2 physisorption, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electron microscopy and Raman spectroscopy are utilized to compare the properties between biochar formed under nitrogen and partial oxidative conditions. At a temperature of 450 ℃, the loading of DAp over cellulose is systematically varied, and its effect on activation is examined. The activated biochar samples are predominantly microporous in the range of concentrations studied. The interaction of DAp with cellulose is investigated and the nature of bonding of the heteroatoms to the carbonaceous matrix is elucidated. The results indicate that the quality of biochar prepared under partial oxidation condition is comparable to that ofbiochar prepared under nitrogen, leading to the possibility of an activated biochar production scheme on a small scale in resource-constrained settings.

关键词： cellulose DAp activation heteroatom,microporous

patternable production of SrTiO_(3) nanoparticles using 1-W laser directly on flexible humidity sensor platform based on ITO/SrTiO_(3)/CNT

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Journal of Materials Science & Technology 2021年第12期71卷 186-194页

作者： Le Thai Duy Ji-Ye Baek Ye-Ji Mun Hyungtak seo Department of Materials Science&Engineering Ajou UniversitySuwon16499South Korea Department of Energy Systems Research Ajou UniversitySuwon16499South Korea

perovskite oxides like S rTiO_(3) at the nanoscale are of interest for eme rging applications,including high-k dielectrics and ***,their synthesis requires long calcination at the elevated temperature,which is a barrier of their application to flexible ***,an effective laser-assisted sol-gel method to patternably produce S rTiO_(3) na noparticles(-100 nm)in selective areas on polyimide substrates(coated with ITO)is ***,the violet-laser power is just 1 W but sufficient to crystallize the material in a short period(a few seconds).Furthermore,developing a flexible device platform using carbon nanotubes(CNT)and SrTiO_(3) nanoparticles for detection of humidity changes at room temperature is *** sensor platform has both capacitive and resistive sensing *** resistive mode with a lower power usage(about 0.2μW)is suitable for long monitoring of humidity in the range of2%RH and *** capacitive mode with higher sensitivity,faster response/recovery time(1-3 min),and lower detection limit(0.5%RH)can be used for calibration *** performance of the flexible sensor is still maintained after 5000 bending cycles at 1.5-cm ***,our synthesis method and the flexible sensor show chances for mass-producing perovskite oxides at low cost for wearable electronics.

关键词： SrTiO_(3) Nanoparticles Laser annealing patternable Flexible sensor CNT

Fluorine doping for improved thermoelectric properties of spark plasma sintered bismuth telluride

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Journal of Materials Science & Technology 2021年第31期90卷 225-235页

作者： Jinseo kim Le Thai Duy Hyunwoo kang Byungmin Ahn Hyungtak seo Department of Energy Systems Research Ajou UniversitySuwon 16499South Korea Department of Materials Science and Engineering Ajou UniversitySuwon 16499South Korea

Bismuth-telluride(Bi_(2)Te_(3))is considered to have the best thermoelectric properties at room temperature(ca.300 k).Thus,synthesis and improvement of Bi_(2)Te_(3)and its derivatives quickly and cost-effectively at favorite temperatures are of ***,doping fluorine(F)into electronic materials(e.g.,FTO)has gained attention;however,it is not applied to Bi_(2)Te_(3)till ***,our synthesis of F-doped Bi_(2)Te_(3)for thermoelectric application is introduced using spark plasma sintering(SpS)for Bi_(2)Te_(3)preparation and reactive ion etching(RIE,with SF_6 gas)for *** exposure time of SF_6 plasma is adjusted to evaluate F-doping effect on the thermoelectric properties of the *** characterizations,the increased electrical conductivity and the improved Seebeck coefficient of F-doped Bi_(2)Te_(3)are *** spectroscopic studies and DFT calculations,the main mechanism behind that improvement is *** also emphasizes the essential role of the F-doping(optimum treatment time of 40 s)in increasing the carrier concentrations as well as electrical *** increasing measurement temperature(300-510 k),F-doping raises the figure of merit of electron rich Bi_(2)Te_(3)from 1.0 to 1.11(peaked at 390 k).

关键词： Bismuth-telluride Fluorine Doping Thermoelectric Spark plasma sintering