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A provable-secure and practical two-party distributed signing protocol for SM2 signature algorithm

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Frontiers of Computer Science 2020年第3期14卷 203-215页

作者： Yudi ZHANG Debiao HE Mingwu ZHANG kim-kwang Raymond CHOO Key Laboratory of Aerospace Information Security and Trusted Computing of Ministry of Education School of Cyber Science and EngineeringWuhan UniversityWuhan 430072China School of Computer Sciences Hubei University of TechnologyWuhan 430068China Department of Information Systems and Cyber Security and Department of Electrical and Computer Engineering University of Texas at San AntonioSan AntonioTX 78249USA

Mobile devices are widely used for data access,communications and ***,storing a private key for signature and other cryptographic usage on a single mobile device can be challenging,due to its computational ***,a number of(t,n)threshold secret sharing schemes designed to minimize private key from leakage have been proposed in the ***,existing schemes generally suffer from key reconstruction *** this paper,we propose an efficient and secure two-party distributed signing protocol for the SM2 signature *** latter has been mandated by the Chinese government for all electronic commerce *** proposed protocol separates the private key to storage on two devices and can generate a valid signature without the need to reconstruct the entire private *** prove that our protocol is secure under nonstandard ***,we implement our protocol using MIRACL Cryptographic SDK to demonstrate that the protocol can be deployed in practice to prevent key disclosure.

关键词： SM2 signature two-party signing wireless environment provable security threshold secret sharing

Impact of Transition Metal Layer Vacancy on the Structure and Performance of P2 Type Layered Sodium Cathode Material

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Nano-Micro Letters 2024年第11期16卷 340-358页

作者： Orynbay Zhanadilov Sourav Baiju Natalia Voronina jun Ho Yu A.-Yeon kim Hun‑Gi jung Kyuwook Ihm Olivier Guillon Payam Kaghazchi Seung‑Taek Myung Department of Nanotechnology and Advanced Materials Engineering and Sejong Battery Institute Hybrid Materials Research CenterSejong University98 Gunja‑DongGwangjin‑GuSeoul 05006South Korea Institute of Energy and Climate Research‑Materials Synthesis and Processing(IEK‑1) Forschungszentrum Jülich GmbH52425 JülichGermany Center for Energy Storage Research Korea Institute of Science and TechnologySeoul 02792South Korea KIST‑SKKU Carbon‑Neutral Research Center Sungkyunkwan UniversitySuwon 16419South Korea Department of Energy Science Sungkyunkwan UniversitySuwon 16419South Korea Pohang Accelerator Laboratory 80 Jigokro‑127‑BeongilNam‑GuPohangGyeongbuk 37673South Korea MESA+Institute for Nanotechnology University of Twente7500 AE EnschedeThe Netherlands

This study explores the impact of introducing vacancy in the transition metal layer of rationally designed Na_(0.6)[Ni_(0.3)Ru_(0.3)Mn_(0.4)]O_(2)(NRM)cathode *** incorporation of Ru,Ni,and vacancy enhances the structural stability during extensive cycling,increases the operation voltage,and induces a capacity increase while also activating oxygen redox,respectively,in Na_(0.7)[Ni_(0.2)V_(Ni0.1)Ru_(0.3)Mn_(0.4)]O_(2)(V-NRM)*** analytical techniques including transmission electron microscopy,X-ray absorption near edge spectroscopy,operando X-ray diffraction,and operando differential electrochemical mass spectrometry are employed to assess changes in the average oxidation states and structural *** results demonstrate that V-NRM exhibits higher capacity than NRM and maintains a moderate capacity retention of 81%after 100 ***,the formation of additional lone-pair electrons in the O 2p orbital enables V-NRM to utilize more capacity from the oxygen redox validated by density functional calculation,leading to a widened dominance of the OP4 phase without releasing O_(2) *** findings offer valuable insights for the design of advanced high-capacity cathode materials with improved performance and sustainability in sodium-ion batteries.

关键词： Layered oxide Oxygen evolution Sodium battery Vacancy Cathode

Anodic-biased titania nanotube growth in low-dielectric viscous media

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International journal of Smart and Nano Materials 2013年第1期4卷 47-54页

作者： Bong june Zhang kwang jin kim Low Carbon Green Technology Laboratory Department of Mechanical Engineering(MS312)University of NevadaRenoNV 89557USA

The influence was investigated of aqueous electrolytes and organic-based electrolytes on nanopore *** create well-defined nanotubes with a high aspect ratio,it is important to maintain equilibrium between field-assisted metal oxide dissolution and field-assisted water dissociation,which influence the temperature and pH levels in TiO_(2) nanotubes(TiO_(2) NTs).This sought after balance in the net reactions of the TiO_(2) NT growth can be achieved by choosing the appropriate electrolytes that are a relatively low dielectric viscous ***(η)and dielectrics(ε)can be a priority in designing the experiment since it is closely related to joule-heating,diffusion-driven metal ions dissolution and chemical etching of the metal *** and the hydrogen bonding ability are inter-correlated to the stability of the[TiF_(6)]^(2-) *** order to examine various electrolyte effects on the anodic-biased nanotube,different categories of electrolytes,each with different viscosity and dielectric properties,were incorporated in this study.

关键词： nanoporous material titanium dioxide nanotube thin film anodizing

Xanthogranulomatous cholecystitis managed by laparotomy may go through troublesome clinical course: Reflection of severe inflammation

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Hepatobiliary & Pancreatic Diseases International 2023年第2期22卷 210-212页

作者： Hee ju kim kwang Yeol Paik Department of Surgery Yeoiudo St.Mary’s HospitalCollege of MedicineThe Catholic University of Korea College of MedicineSeoul 07345Korea

To the Editor: Xanthogranulomatous cholecystitis(XGC) is an uncommon inflammatory disease of the gallbladder, and its incidence is reported to be 1.3%-5.2% [1]. XGC is diagnosed by histopathological examination, characterized by severe inflammatory destruction followed by a granulomatous reaction, marked proliferative fibrosis, and infiltration of inflammatory cells [2].

关键词： granuloma cholecystitis inflammation

Global parameter estimation of the Cochlodinium polykrikoides model using bioassay data

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Acta Oceanologica Sinica 2016年第2期35卷 39-45页

作者： CHO Hong-Yeon PARK kwang-Soon kim Sung Coastal and Environmental Engineering Division Korea Institute of Ocean Science and Technology Coastal Disaster Research Center Korea Institute of Ocean Science and Technology Biological Oceanography and Marine Biology Division Korea Institute of Ocean Science and Technology

Cochlodinium polykrikoides is a notoriously harmful algal species that inflicts severe damage on the aquacultures of the coastal seas of Korea and japan. Information on their expected movement tracks and boundaries of influence is very useful and important for the effective establishment of a reduction plan. In general, the information is supported by a red-tide（a.k.a algal bloom） model. The performance of the model is highly dependent on the accuracy of parameters, which are the coefficients of functions approximating the biological growth and loss patterns of the C. polykrikoides. These parameters have been estimated using the bioassay data composed of growth-limiting factor and net growth rate value pairs. In the case of the C. polykrikoides, the parameters are different from each other in accordance with the used data because the bioassay data are sufficient compared to the other algal species. The parameters estimated by one specific dataset can be viewed as locally-optimized because they are adjusted only by that dataset. In cases where the other one data set is used, the estimation error might be considerable. In this study, the parameters are estimated by all available data sets without the use of only one specific data set and thus can be considered globally optimized. The cost function for the optimization is defined as the integrated mean squared estimation error, i.e., the difference between the values of the experimental and estimated rates. Based on quantitative error analysis, the root-mean squared errors of the global parameters show smaller values, approximately 25%–50%, than the values of the local parameters. In addition, bias is removed completely in the case of the globally estimated parameters. The parameter sets can be used as the reference default values of a red-tide model because they are optimal and representative. However, additional tuning of the parameters using the in-situ monitoring data is highly *** opposed to the bioassay d

关键词： global and local estimation gain and loss parameters Cochlodinium polykrikoides bioassay data model performance

Effect of carbon on microstructure of CrAlC_xN_(1-x) coatings by hybrid coating system

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Transactions of Nonferrous Metals Society of China 2011年第A01期21卷 78-82页

作者： Sung-Kyu AHN Se-Hun KWON kwang-Ho kim National Core Research Center for Hybrid Materials Solution Pusan National University School of Materials Science and Engineering Pusan National University

A systematic investigation of the microstructure of CrA1CxN1-x coatings as a function of carbon contents was conducted. Quaternary CrA1CxN1-x coatings were deposited on Si wafers by a hybrid coating system combining an arc-ion plating technique and a DC reactive magnetron sputtering technique using Cr and AI targets in the Ar/N2/CH4 gaseous mixture. The effect of carbon content on microstructure of CrA1C^N~ x coatings was investigated with instrumental analyses of X-ray diffraction, X-ray photoelectron, and high-resolution transmission electron microscopy. The results show that the carbon content of CrA1CxN1-x coatings linearly increases with increasing CH4/（CH4/N2） gas flow rate ratio. The surface roughness of the CrA1CxN1-x coating layer decreases with the increase of carbon content.

关键词： CrA1C,N1-x, coating nanocomposite microstructure hybrid coating system

Prediction of high thermoelectric performance in the lowdimensional metal halide Cs_(3)Cu_(2)I_(5)

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npj Computational Materials 2021年第1期7卷 476-481页

作者： Young-kwang jung In Taek Han Yong Churl kim Aron Walsh Department of Materials Science and Engineering Yonsei UniversitySeoulSouth Korea Samsung Advanced Institute of Technology(SAIT) Samsung Electronics Materials Research ComplexYoungtongSuwonSouth Korea Department of Materials Imperial College LondonLondonUK

Metal halides have emerged as a new generation of semiconductors with applications ranging from solar cells to chemical *** assess the thermoelectric potential of Cs_(3)Cu_(2)I_(5),which has a crystal structure formed of zero-dimensional[Cu_(2)I_(5)]3−anionic clusters that are separated by Cs+counter *** find the compound exhibits the characteristics of a phonon-glass electroncrystal with a large imbalance in the conduction of heat and electrons predicted from first-principles transport *** anharmonic phonon–phonon scattering results in short-lived acoustic vibrations and an ultra-low lattice thermal conductivity(10 cm^(2)V^(−1)s^(−1)).For an n-type crystal at 600 K,a thermoelectric figure-of-merit ZT of 2.6 is found to be accessible,which for a cold source of 300 K corresponds to a thermodynamic heat-to-electricity conversion efficiency of 15%.

关键词： theory phonon crystal

BSKCN and BSAML: blind signatures from the module lattice and the asymmetric module lattice

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Frontiers of Computer Science 2023年第6期17卷 175-177页

作者： Xiaofan LIU Wei REN kim-kwang Raymond CHOO School of Computer Science China University of GeosciencesWuhan 430074China Department of Information Systems and Cyber Security University of Texas at San AntonioSan AntonioTX 78249-0631USA

1 Introduction Blind signature allows a user to obtain the signature of a message from a signer without revealing the information of the message,as well as defending against *** recent years,there have been increased efforts to design post-quantum blind signature schemes,since it is known that classical cryptography assumptions(e.g.,integer factoring problem and discrete logarithm problem)are not secure against attacks carried out using quantum computers[1].One popular approach is to design blind signature schemes using *** first lattice-based blind signature scheme is proposed by Rückert[2],who also presented a general process of constructing lattice-based blind signature influenced by Lyubashevskys’s secure framework[3].Rückert’s approach achieves both blindness and one-more unforgeability in the random oracle *** then,many other blind signature schemes have extended Rückert signature *** example,based on Crystals-Dilithium[4](one of the NIST post-quantum signature standardization),Le et al.[5]created a blind signature from module lattices.

关键词： signature blind constructing

Formation of nanocrystalline microstructure in arc ion plated CrN films

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Transactions of Nonferrous Metals Society of China 2011年第A01期21卷 73-77页

作者： Qi-min WANG Se-Hun KWON kwang-Ho kim National Core Research Center for Hybrid Materials Solution Pusan National University Busan 609-735 Korea School of Materials Science and Engineering Pusan National University Busan 609-735 Korea

Applying negative bias voltages caused significant microstructure changes in arc ion plated CrN films. Nanocrystalline microstructures were obtained by adjusting the negative bias voltage. Structural characterizations of the films were carried out using X-ray diffractometry (XRD) and high-resolution transmission electron microscopy (HR-TEM). The results indicated that increasing ion bombardment by applying negative bias voltages resulted in the formation of defects in the CrN films, inducing microstructure evolution from micro-columnar to nanocrystalline. The microhardness and residual stresses of the films were also affected. Based on the experimental results, the evolution mechanisms of the film microstructure and properties were discussed by considering ion bombardment effects.

关键词： CrN thin films deposition microstructure arc ion plating ion bombardment