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A Key Recovery System Based on Password-Protected Secret Sharing in a Permissioned Blockchain

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Computers, Materials & Continua 2020年第10期65卷 153-170页

作者： Gyeong-Jin ra Chang-Hyun Roh im-Yeong Lee First Soonchunhyang University Asan-si31538Korea

In today’s fourth industrial revolution,various blockchain technologies are being actively researched.A blockchain is a peer-to-peer data-sharing structure lacking central *** a user wishes to access stored data,she/he must employ a private key to prove ownership of the data and create a *** the private key is lost,blockchain data cannot be *** solve such a problem,public blockchain users can recover the key using a wallet ***,key recovery in a permissioned blockchain(PBC)has been but little *** PBC server is Honest-but-Curious(HBC),and should not be able to learn anything of the user;the server should simply recover and store the *** server must also be resistant to malicious ***,key recovery in a PBC must satisfy various security ***,we present a password-protected secret sharing(PPSS)key recovery system,protected by a secure password from a malicious key storage server of a *** describe existing key recovery schemes and our PPSS scheme.

关键词： Password-protected secret sharing key recovery blockchain wallet security

Spatial analysis of vegetation cover response to climate trends in Khakassia(South Siberia)

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Journal of Mountain Science 2023年第10期20卷 2869-2884页

作者： im Sergei Institute of natural Sciences and Mathematics Khakassian State University named after N.F.KatanovAbakan 655000Russia V.N.Sukachev Institute of Forest Krasnoyarsk Science Centre of the Siberian Branch of Russian Academy of ScienceKrasnoyarsk 660036Russia Institute of Ecology and Geography Siberian Federal UniversityKrasnoyarsk 660041Russia Institute of Space Research and High Technologies Reshetnev Siberian State University of Science and TechnologyKrasnoyarsk660014Russia

An analysis of the changes in vegetation cover on the territory of the Republic of Khakassia in 2000–2021 due to climatic trends was carried out based on the MODIS *** changes in vegetation cover were estimated based on trends in Normalized Difference Vegetation Index(NDVI)and Enhanced Vegetation Index(EVI).In general,in the 21st century,an increase in the biomass of vegetation cover is *** trends were observed in 16%–22%of the territory,and negative only in 1%–3%.For about 20%of the analyzed territory,a significant influence of climate on the changes in vegetation cover was *** most pronounced negative impact on vegetation cover was caused by summer air and soil temperatures,spring temperature,and summer winds,and the positive impact was caused by summer precipitation and soil *** response of the vegetation cover to climate was non-uniform concerning the ***,a significant correlation with the amount of precipitation was observed for~20%–35%of vegetation growing below 600 m above sea level and for less than 5%above this *** negative effect of summer temperatures on plants prevailed mainly at an elevation below~1400 m above sea *** climate change is likely to lead to significant degradation of vegetation in the steppe and foreststeppe in Khakassia in the coming decades.

关键词： Khakassia South Siberia Vegetation cover Climate trends Remote sensing MODIS NDVI EVI Relief

EFFECT OF ARTIFICIAL WEATHERING AND TEMPEraTURE CYCLING ON THE ADHESION STRENGTH OF WATERBORNE ACRYlaTE COATING SYSTEMS USED FOR WOODEN WINDOWS

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Journal of Green Building 2020年第1期15卷 3-14页

作者： Šimůnková Kristýna Hýsek Štěpán Oberhofnerová Eliška Pánek Miloš Fidan Hakan Faculty of Forestry and Wood Sciences Czech University of Life Sciences in PragueKamycka 129Prague 16500Czech Republic

The adhesion of coatings to wood is important for their long-term *** this study,the adhesion strength of water-based acrylate coatings used for wooden windows after exposure to artificial weathering(AW)and temperature cycling(TC)was *** analysis of the adhesion quality of coatings was performed via a pull-off test and failure *** 3-layered and 4-layered white and brown acrylate dispersions from six different producers were compared and the effect of coating thickness on adhesion strength was *** adhesion strength values proved to be very *** AW,the adhesion strength and its variability increased for all the *** had no statistically significant effect on the adhesion strength *** coating systems were initially characterized by lower adhesion strength,but after AW and TC,they reached higher adhesion strength values than brown *** overall highest adhesion after AW and TC was recorded for the coatings based on alkyd-acrylate hybrid basis(Producer 3),while the lowest adhesion variability after AW was measured for one type of tested acrylate coating(Producer 4).The effect of different layering on adhesion strength was not demonstrated in this study.

关键词： acrylate coatings adhesion strength artificial weathering coating thickness pull-off test temperature cycling

Stochastic structural optimization using particle swarm optimization, surrogate models and Bayesian statistics

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Chinese Journal of Aeronautics 2013年第1期26卷 112-121页

作者： Jongbin im Jungsun Park Korea Aerospace Research Institute Department of Aerospace and Mechanical Engineering Korea Aerospace University

This paper focuses on a method to solve structural optimization problems using particle swarm optimization （PSO）, surrogate models and Bayesian statistics. PSO is a random/stochastic search algorithm designed to find the global optimum. However, PSO needs many evaluations compared to gradient-based optimization. This means PSO increases the analysis costs of structural optimization. One of the methods to reduce computing costs in stochastic optimization is to use approximation techniques. In this work, surrogate models are used, including the response surface method （RSM） and Kriging. When surrogate models are used, there are some errors between exact values and approximated values. These errors decrease the reliability of the optimum values and discard the realistic approximation of using surrogate models. In this paper, Bayesian statistics is used to obtain more reliable results. To verify and confirm the efficiency of the proposed method using surrogate models and Bayesian statistics for stochastic structural optimization, two numerical examples are optimized, and the optimization of a hub sleeve is demonstrated as a practical problem.

关键词： Bayesian statistics Kriging Particle swarm optimization (PSO) Response surface method (RSM)

Effect of anaerobic digestion on the high rate of nitritation,treating piggery wastewater

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Journal of Environmental Sciences 2011年第11期23卷 1787-1793页

作者： Jiyeol im Kyungik Gil Department of Civil Engineering Seoul National University of Science and TechnologySeoulSouth Korea School of Civil Engineering Seoul National University of Science and TechnologySeoulSouth Korea

The amount of piggery wastewater as domestic livestock is *** volume of piggery wastewater produced is less than the volume of other wastewaters,but piggery wastewater has a heavy impact on wastewater streams due to an extremely high concentration of nitrogen and *** this study,laboratory reactors were operated using piggery wastewater and the effluent of anaerobic digester from piggery wastewater *** purpose of this study was to induce the nitritation process,which is an economically advantageous nitrogen removal method that converts ammonium nitrogen into *** results showed that the effluent of anaerobic digester from piggery wastewater was more efficient than raw piggery wastewater in terms of inducing *** can be deduced that nitritation is largely affected by an organic fraction of piggery *** can also be concluded that a small amount of biodegradable organic matter in piggery wastewater is efficient in inducing nitritation.

关键词： piggery wastewater anaerobic digestion nitritation nitrogen

Non-point source analysis of a railway bridge area using statistical method:Case study of a concrete road-bed

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Journal of Environmental Sciences 2014年第6期26卷 1321-1324页

作者： Kyungik Gil Jiyeol im Department of Civil Engineering Seoul National University of Science and TechnologyNowon-gu Seoul 139-743 Korea School of Civil Environmental and Architectural Engineering Korea University Anam-Dong 5gaSeongbuk-Gu Seoul 163-701 Korea

In an effort to protect the quality of the water system, interest in non-point source pollution is increasing. Recently, studies of non-point sources pollution are continuing in relation to various land- use areas, but such studies have not been fully conducted in railway facility sites. Using monitoring data of railway bridge area with concrete road-bed, the runoff characteristics, pollutant unit loads, and first flush criteria were assessed. railway bridge area with concrete road-bed typically show the first flush effect, and the pollutant unit load was determined to be higher than other public facilities areas. Further, the first flush criteria show an effective rainfall amount of 7 mm. In other words, from the runoff of railway facilities, considerable amounts of non-point source pollutants are occurred, indicating the need to create best management practices which are adequate for railway facility sites.

关键词： non-point source pollution railway concrete road-bed first flush criteria first flush effect

Clostridium difficile infection aggravates colitis in interleukin 10-deficient mice

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World Journal of Gastroenterology 2014年第45期20卷 17084-17091页

作者： Mi na Kim Seong-Joon Koh Jung Mogg Kim Jong Pil im Hyun Chae Jung Joo Sung Kim Seoul national University Healthcare System Gangnam Center Seoul National University Hospital Department of Internal Medicine Seoul National University Boramae Hospital Seoul National University College of Medicine Department of Microbiology Hanyang University College of Medicine Department of Internal Medicine Liver Research Institute Seoul National University College of Medicine

Aim: To investigate the effect of Clostridium difficile (C. difficile) infection in an interleukin 10-deficient (IL-10-/-) mouse model of inflammatory bowel disease.

关键词： Clostridium difficile Inflammatory bowel disease Interleukin 10-deficient mice Interferon-γ Colitis

improved rate-distortion optimized video coding using non-integer bit estimation and multiple lambda search

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Frontiers of Computer Science 2016年第1期10卷 157-166页

作者： Sio Kei im Mohammad Mahdi GHANDI MPI-QMUL Information Systems Research Centre Macao Polytechnic Institute Macao China Department of Electronic Systems Engineering University of Essex Colchestey CO4 3SQ UK

Many modern video encoders use the lagrangian rate-distortion optimization （RDO） algorithm for mode deci- sions during the compression procedure. For each encoding stage, this approach involves minimizing a cost, which is a function of rate, distortion and a multiplier called lambda. This paper proposes to improve the RDO process by applying two modifications. The first modification is to increase the ac- curacy of rate estimation, which is achieved by computing a non-integer number of bits for arithmetic coding of the syntax elements. This leads to a more accurate cost computation and therefore a better mode decision. The second modification is to search and adjust the value of lambda based on the char- acteristics of each coding stage. For the encoder used, this paper proposes to search multiple values of lambda for the intra-4x4 mode decision. Moreover, a simple shift in lambda value is proposed for motion estimation. Each of these modi- fications offers a certain gain in RDO performance, and, when all are combined, an average bit-rate saving of up to 7.0% can be achieved for the H.264/AVC codec while the same concept is applicable to the H.265/HEVC codec as well. The extra added complexity is contained to a certain level, and is also adjustable according to the processing resources available.

关键词： rate distortion optimization lambda adjust-ment non-integer bit estimation H.264/AVC H265/HEVCvideo coding

A highly sensitive chemical gas detecting transistor based on highly crystalline CVD-grown MoSe2 films

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nano Research 2017年第6期10卷 1861-1871页

作者： Jongyeol Baek Demin Yin na Liu Inturu Omkaram Chulseung Jung Healin im Seongin Hong Seung Min Kim Young Ki Hong Jaehyun Hur Youngki Yoon Sunkook Kim Multi-Functional nano/Bio Electronics lab. Kyung Hee University Gyeonggi 446-701 Republic of Korea Department of Electrical and Computer Engineering & Waterloo Institute for nanotechnology (WIN) University of Waterloo Waterloo ON N2L 3GI Canada Institute of Advanced Composite Materials Korea Institute of Science and Technology (KIST) Jeonbuk 565-905 Republic of Korea Department of Chemical and Biological Engineering Gachon University Seongnam-si Gyeonggi 13120 Republic of Korea

layered semiconductors with atomic thicknesses are becoming increasingly important as active elements in high-performance electronic devices owing to their high carrier mobilities, large surface-to-volume ratios, and rapid electrical responses to their surrounding environments. Here, we report the first implementation of a highly sensitive chemical-vapor-deposition-grown multilayer MoSe2 field-effect transistor （FET） in a NO2 gas sensor. This sensor exhibited ultra-high sensitivity （S = ca. 1,907 for NO2 at 300 ppm）, real-time response, and rapid on-off switching. The high sensitivity of our MoSe2 gas sensor is attributed to changes in the gap states near the valence band induced by the NO2 gas absorbed in the MoSe2, which leads to a significant increase in hole current in the off-state regime. Device modeling and quantum transport simulations revealed that the variation of gap states with NO2 concentration is the key mechanism in a MoSe2 FET-based NO2 gas sensor. This comprehensive study, which addresses material growth, device fabrication, characterization, and device simulations, not only indicates the utility of MoSe2 FETs for high-performance chemical sensors, but also establishes a fundamental understanding of how surface chemistry influences carrier transport in layered semiconductor devices.

关键词： transition metaldichalcogenides MoSe2 chemical sensors chemical vapor depositon