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3-Multi ranked encryption with enhanced security in cloud computing

Digital Communications and Networks 2023年第2期9卷 313-326页

作者： YeEun Kim Junggab Son Reza M.Parizi Gautam Srivastava Heekuck oh Major in Bio Artificial Intelligence Dept.of Computer Science and EngineeringHanyang UniversityAnsanRepublic of Korea Department of Computer Science Kennesaw State UniversityMariettaUSA Department of Software Engineering Kennesaw State UniversityMariettaUSA Department of Mathematics and Computer Science Brandon UniversityBrandonCanada Research Center for Interneural Computing China Medical UniversityTaichungTaiwanChina Dept.of Computer Science and Engineering Hanyang UniversityAnsanRepublic of Korea

Searchable Encryption(SE)enables data owners to search remotely stored ciphertexts selectively.A practical model that is closest to real life should be able to handle search queries with multiple keywords and multiple data owners/users,and even return the top-k most relevant search results when *** refer to a model that satisfies all of the conditions a 3-multi ranked search ***,SE schemes that have been proposed to date use fully trusted trapdoor generation centers,and several methods assume a secure connection between the data users and a trapdoor generation *** is,they assume the trapdoor generation center is the only entity that can learn the information regarding queried keywords,but it will never attempt to use it in any other manner than that requested,which is impractical in real *** this study,to enhance the security,we propose a new 3-multi ranked SE scheme that satisfies all conditions without these security *** proposed scheme uses randomized keywords to protect the interested keywords of users from both outside adversaries and the honest-but-curious trapdoor generation center,thereby preventing attackers from determining whether two different queries include the same ***,we develop a method for managing multiple encrypted keywords from every data owner,each encrypted with a different *** evaluation demonstrates that,despite the trade-off overhead that results from the weaker security assumption,the proposed scheme achieves reasonable performance compared to extant schemes,which implies that our scheme is practical and closest to real life.

关键词： Searchable encryption Multi-keyword search Multiple data owners/users Ranked search Enhanced security

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A novel elastoplastic model for Yunnan sandstone under poly-axial loading

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International Journal of Mining Science and Technology 2023年第7期33卷 801-814页

作者： Xu Li Guangyao Si Joung oh Ismet Canbulat Rui Kong Jian Zhang School of Minerals and Energy Resources Engineering University of New South WalesSydney NSW 2052Australia Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang 110819China School of Safety Science and Engineering Henan Polytechnic UniversityJiaozuo 454003China

The lack of understanding of plastic hardening(softening)laws,especially under anisotropic stress conditions,results in inappropriate geotechnical *** of the yielding envelopes do not consider the effect of intermediate principal stress and the influence of Lode's *** addition,the application of plastic flow rules regarding yielding surfaces compromises the softening of rock internal friction as well as the influence of Lode's angle on the plastic ***,the ductility to brittleness transition in the intermediate principal stress direction still requires a theoretical *** this study,based on poly-axial testing results of Yunnan sandstone,we adopted a failure criterion with the intermediate principal stress proposed by Menétrey and *** proposed new failure envelope was applied to capture the plastic evolution of rock samples.A plastic hardening-softening model is constructed,based on the framework of the plastic *** softening envelope is modified to better present the stress drop and considers the deterioration of rock internal friction in the post-peak stage of poly-axial *** differential of plastic potential according to the principal stresses is also modified,considering the rotation of Lode's angle in the poly-axial loading *** model results were compared with laboratory testing results,which showed great consistency across 9 different loading tests(5 under triaxial stress and 4 under poly-axial stress with 22 stress-strain curves in total).The induced brittleness by the intermediate principal stress is also well captured by the proposed model.

关键词： Elastoplastic model Rock mechanics Poly-axial stress state True-triaxial

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Versatile control of concentration gradients in non-fullerene acceptor-based bulk heterojunction films using solvent rinse treatments

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Green Energy & Environment 2022年第5期7卷 1102-1110页

作者： Chang-Mok oh Soyeong Jang Jihoon Lee Sung Heum Park In-Wook Hwang Advanced Photonics Research Institute Gwangju Institute of Science and TechnologyGwangju61005Republic of Korea Department of Physics Pukyong National UniversityBusan48513Republic of Korea

Solvent rinse treatments using polar methanol(Me oh)and nonpolar n-hexane have been developed for controlling material concentration gradients along the longitudinal direction of non-fullerene acceptor-based bulk heterojunction(BHJ)films comprised of electron donor polymer,PBDB-T and acceptor,*** the used solvents(chlorobenzene with 1 vol%DIO)were completely evaporated,ITIC-m rich domains were formed at the top surface of the BHJ films after they were rinsed with Me oh,as evidenced by water contact angle,atomic force microscopy,time-of-flight secondary ion mass spectroscopy,which led to enhanced electron transport in the conventional structure of organic solar cells(OSCs).In contrast,after rinsing with n-hexane,ITIC-m rich domains were formed at the bottom surface of the films,which improved electron transport in the inverted structure *** enhanced carrier transports increased the PCEs(11.80%and 11.15%)in both conventional and inverted OSCs by 10.29%and 10.35%compared with control *** versatile control of material concentration gradients is determined to be feasible owing to the chemical interaction of the used substrates(glass,PEDOT:PSS,and Zn O)and rinsing solvents.

关键词： films treatment heterojunction

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Detection of coat protein gene of nervous necrosis virus using loopmediated isothermal amplification

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Asian Pacific Journal of Tropical Medicine 2016年第3期9卷 230-235页

作者： Jinik Hwang Sung-Suk Suh Mirye Park Myung-Joo oh Jong-oh Kim Sukchan Lee Taek-Kyun Lee South Sea Environment Research Department Korea Institute of ocean science & technology Korea University of Science and Technology Department of Aqualife Medicine Chonnam National University Department of Genetic Engineering Sungkyunkwan University

Objective:To establish a novel and highly specific loop-mediated isothermal amplification(LAMP) assay for the identification of nervous necrosis virus(NNV) ***:A set of synthesized primers was used to match the sequences of a specific region of the nnr gene from the National Center for Biotechnology Information database,not originating from NNV-infected fish,the efficiency and specificity of LAMP were measured dependent on the concentration of DNA polymerase and the reaction temperature and *** addition,to determine species-specific LAMP primers,cross reactivity testing was applied to the reaction between NVV and other virus families including viral hemorrhagic septicemia virus and marine ***:The optimized LAMP reaction carried out at 64 ℃ for 60 min,and above 4 U Bst DNA *** sensitivity of LAMP for the detection of nnv was thus about 10 times greater than the sensitivity of polymerase chain *** LAMP assay primers were specific for the detection NNV infection in Epinephelus ***:The development of LAMP primers based on genetic information from a public database,not virus-infected samples,may provide a very simple and convenient method to identify viral infection in aquatic organisms.

关键词： Nervous necrosis virus Nodaviridae Polymerase chain reaction Loop-mediated isothermal Amplification

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Political Fandom and Political Participation in the Digital Age——The Case of Moon Jae-in Fandom in South Korea

Political Fandom and Political Participation in the Digital ...

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作者： oh,Jeonghyun 上海交通大学

学位级别：硕士

Since Moon Jae-in was inducted as President of South Korea after series of nationwide protests to impeach the Former President Park Geun-hye,supporters of Moon have shown unprecedented ways to express their loyalty to the *** political behavior,mainly observed in the digital space,goes beyond traditional ways of political support and stretches to unqualified advocacy for the *** demeanor is on par with *** allegiance is shown in what is known as fan practices,which is not necessarily strategically promoted by the politician,but,rather,voluntarily and creatively driven by the fans or *** study identifies this new political behavior as politician fandom in reference to the five attributes of fandom devised by Jenkins（1992）and investigates the factors to its ***,it further analyzes the news articles shared in the target community through the lens of networked *** as acknowledging the side effects of political fandom in this age of post-truth,this article throws light on its optimistic prospect on participatory and deliberative democracy.

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Nonlinear dynamics of curved IPMC actuators undergoing electrically driven large deformations

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International Journal of Smart and Nano Materials 2012年第3期3卷 214-225页

作者： Jin-Han Jeon Choonghee Jo Il-Kwon oh School of Mechanical Aerospace and Systems EngineeringKorea Advanced Institute of Science and Technology291 Daehak-roYuseong-guDaejeon 305-701Republic of Korea

The nonlinear dynamics of curved ionic polymer-metal composite(IPMC)actuators having large tip displacement and periodical jumping locomotion was investigated *** snap-through phenomena,the actuator generates much larger tip displacement and shows abrupt jumps in the transitions of upswings and downswings with low input *** curved IPMC cantilever actuators having two different constant curvatures of 0.01 mm^(−1) and 0.02 mm^(−1) were fabricated through thermal treatment from flat IPMCs,simultaneously with no residual ***-fabricated IPMC actuators were tested to evaluate the effect of initial curvature under static and dynamic electrical *** the case of the flat IPMC actuator,asymmetric characteristics in step and harmonic responses were investigated in the curved IPMC ***,at relatively higher input voltage,snap-through phenomena were observed with much larger transverse displacements and periodical abrupt jumps of the instant *** revealed jumping movements between the multiple equilibrium *** results show that optimum curvatures for better bending performance of curved cantilever IPMCs exist and that this snap-through mechanism could be applied to IPMC actuators by considering their soft and flexible properties and the geometric structures.

关键词： ionic polymer-metal composite snap-through dynamics thermal treatment actuator

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A Designated Query Protocol for Serverless Mobile RFID Systems with Reader and Tag Privacy

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Tsinghua Science and Technology 2012年第5期17卷 521-536页

作者： Jiwhan Lim Sangjin Kim Heekuck oh Donghyun Kim Information & Communications Examination Bureau Korean Intellectual Property Office School of Computer Science & Engineering Korea University of Technology & Education Department of Computer Science and Engineering Hanyang University Department of Mathematics & Computer Science North Carolina Central University

Recently, a new type of Radio Frequency IDentification （RFID） system with mobile readers is introduced. In such a system, it is more desirable for mobile readers to identify tags without a back-end server, and thus it is frequently referred as a serverless mobile RFID system. In this paper, we formalize a serverless mobile RFID system model and propose a new encryption-based system that preserves the privacy of both tags and readers in the model. In addition, we define a new adversary model for the system model and show the security of the proposed system. Throughout comparisons between ours and the other alternatives, we show that our proposed system provides a stronger reader privacy and robustness against a reader forgery attack than the competitors.

关键词： Radio Frequency IDentification (RFID) serverless designated query protocol reader privacyencryption-based

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Stochastic particle based models for suspended particle movement in surface flows

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International Journal of Sediment Research 2014年第2期29卷 195-207页

作者： Christina W.TSAI Chuanjian MAN Jungsun oh Department of Civil Structural and Environmental EngineeringState University of New York at BuffaloBuffaloNY 14051USA Assoc.Prof. Department of Civil and Environmental Engineering National Taiwan University

Modeling of suspended sediment particle movement in surface water can be achieved by stochastic particle tracking model *** this paper,different mathematical forms of particle tracking models are introduced to describe particle movement under various flow conditions,i.e.,the stochastic diffusion process,stochastic jump process,and stochastic jump diffusion *** the stochastic diffusion process can be used to represent the stochastic movement of suspended particles in turbulent flows,the stochastic jump and the stochastic jump diffusion processes can be used to describe suspended particle movement in the occurrences of a sequence of extreme *** extreme flow herein is defined as a hydrologic flow event or a hydrodynamic flow phenomenon with a low probability of occurrence and a high impact on its ambient flow *** this paper,the suspended sediment particle is assumed to immediately follow the extreme flows in the jump process(*** time lag between the flow particle and the sediment particle in extreme flows is considered negligible).In the proposed particle tracking models,a random term mainly caused by fluid eddy motions is modeled as a Wiener process,while the random occurrences of a sequence of extreme flows can be modeled as a Poisson *** frequency of occurrence of the extreme flows in the proposed particle tracking model can be explicitly accounted for by the Poisson process when evaluating particle *** ensemble mean and variance of particle trajectory can be obtained from the proposed stochastic models via *** ensemble mean and variance of particle velocity are verified with available *** of the proposed stochastic particle tracking models for sediment transport modeling is also discussed.

关键词： Suspended sediment Particle tracking model Stochastic modeling Diffusion process Poisson jump process Jump diffusion process Extreme flows

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Comments on "Direct Radiative Forcing of Anthropogenic Aerosols over Oceans from Satellite Observation"

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Advances in Atmospheric Sciences 2013年第1期30卷 10-14页

作者： Hye-Ryun oh Chang-Hoi HO Yong-Sang CHOI School of Earth and Environmental Sciences Seoul National University Department of Environmental Science and Engineering Ewha Womans University

Previous observational studies have estimated anthropogenic aerosol direct radiative forcing over oceans without due consideration of cloudy-sky aerosols. However, when interaction between clouds and aerosols located below or above the cloud level is taken into account, the aerosol direct radiative forcing is larger by as much as 5 W m-2 in most mid-latitude regions in the Northern Hemisphere.

关键词： cloudy-sky aerosol forcing anthropogenic aerosol aerosol optical depth satellite observations

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Alloy Design of Gamma(TiAl)Alloys

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Acta Metallurgica Sinica(English Letters) 1995年第Z1期8卷 319-328页

作者： Young-Won KIM(UES, Inc., Dayton, oh 45432, USA) UES Inc Dayton United States

Unbalanced properties for both fine-grained gamma and coarse-grained lamellar microstructures typically produced in gamma alloys are described. Efforts for the improvements are reviewed along with some experimental results. Empirical improvements have been made in cast alloys, which have led gamma alloys to a viable materials technology and to the development of various application areas for gas turbine engines as well as automotive engines. Efforts to understand fundamental and applied aspects leading to the improvements are assessed for wrought alloys. Optimization of microstructures through process control,innovative heat treatments, alloy chemistry modification and their combinations have progressed in the endeavor. Similar efforts have just begun for cast alloys where work on fundamental understanding has been lagging. Future directions are suggested for further improvements and predicted for the development of higher temperature/performance alloys.

关键词： gamma TiAl cast alloys wrought alloys designed microstructures...

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