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Poly.omial-Time Key.Recovery.Attacks Against NTRURe Encry.t from ASIACCS'15

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Journal of Sy.tems Science & Complexity 2024年第3期37卷 1308-1325页

作者： liu zhen PAN y.nbin zhenG Jinwei School of Cy.er Science and Technology Hubei Key Laboratory of Applied MathematicsHubei UniversityWuhan 430062China Key.Laboratory.of Mathematics Mechanization Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100190China

In ASIACCS 2015, Nu nez, et al. proposed a proxy.re-encry.tion scheme, named NTRURe Encry.t, based on NTRU, which allows a proxy.to translate ciphertext under the delegator’s public key.into a re-encry.ted ciphertext that can be decry.ted correctly.by.delegatee’s private key. Because of the potential resistance to quantum algorithm, high efficiency.and various applications in real life,NTRURe Encry.t has drawn lots of attention and its security.has been widely.discussed and *** PQCry.to2019, liu, et al. proposed two key.recovery.attacks against it. However, their first attack heavily.relies on a weaken decry.tion oracle, and the second attack needs to collect about 260ciphertexts from the same message by.theoretical analy.is, which makes both of the attacks unrealistic. In this paper, inspired by.the broadcast attack against NTRU, the authors find out that for NTRURe Encry.t the delegator and the delegatee can efficiently.recover each other’s private key.in poly.omial time without any.unrealistic assumptions. In addition, the authors also show how to fix NTRURe Encry.t to resist the proposed attacks. As a by.product, the authors also show how to commit broadcast attacks against NTRU 2001 with even dg, which was thought infeasible before.

关键词： Broadcast attack key.recovery NTRU NTRUReEncry.t

Design and Gait Planning of a Worm-inspired Metameric Robot for Pipe Crawling

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Journal of Bionic Engineering 2024年第3期21卷 1265-1277页

作者： y. liu Qingbiao Shi zhen Chen Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen UniversityXiamen361102China

The earthworm has been attracted much attention in the research and development of biomimetic robots due to their unique locomotion mechanism,compact structure,and small motion *** paper presents a new design and prototy.e of a worm-inspired metameric robot with a movement pattern similar to that of *** robot consists of multiple telescopic modules connected in series through joint *** telescopic module mimics the contraction and elongation motion modes of the earthworm segments.A kinematic and dy.amic analy.is is conducted on the telescopic module,and an input torque calculation method is provided to ensure sufficient friction between the robot and the pipe *** gait modes of the prototy.e robot for straight and turning locomotion are introduced,and these modes are extended to robots constructed by.different numbers of telescopic *** addition,a method is proposed to increase the friction between the robot and the pipe wall in the aforementioned gait modes without changing the robot structure,thereby.improving the robot’s motion ability.in *** theoretical model of gait modes has also been validated through gait *** findings of this paper would provide a useful basis for the design,modeling,and control of future worm inspired robots.

关键词： Bio-inspired robot Spatial linkage mechanism Kinematics model Peristaltic locomotion

Poly.er-to-Monomers Chemically.Recy.lable Poly.imide-imine)Plastics with Extreme-Condition Resistance and Flame Retardancy

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Chinese Journal of Poly.er Science 2024年第10期42卷 1525-1535,I0012页

作者： zhen-y. Wang Xiao-Kong liu State Key.Laboratory.of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun130012China

Poly.mides are a family.of high-tech plastics that have irreplaceable applications in the fields of aerospace,defense,and opto-electronics,but poly.mides are difficult to be reprocessed and recy.led at the end of their service life,resulting in a significant waste of ***,it is of great significance to develop recy.lable poly.mides with comparable properties to the commercial ***,we report a novel poly.er-to-monomers chemically.recy.lable poly.imide-imine)(PtM-CR-PII)plastic,sy.thesized by.cross-linking the amine-terminated aromatic bisimide monomer and the hexa-vanillin terminated cy.lophosphazene monomer via dy.amic imine *** PtM-CR-PII plastic exhibits comparable mechanical and thermal properties as well as chemical stability.to the commercial *** PtM-CR-PII plastic possesses a high y.ung’s modulus of≈3.2 GPa and a tensile strength as high as≈108 MPa,which also exhibits high thermal stability.with a glass transition temperature of≈220℃.Moreover,the PtM-CR-PII plastic exhibits outstanding waterproofness,acid/alkali-resistance,and solvent-resistance,its appearance and mechanical properties can be well maintained after long-term soaking in water,highly.concentrated acid and base,and various organic ***,the cy.lophosphazene moieties endow the PtM-CR-PII plastic with excellent flame *** PtM-CR-PII plastic exhibits the highest UL-94 flame-retarding rating of V-0 and a limiting oxy.en index(LOI)value of 45.5%.Importantly.the PtM-CR-PII plastic can be depoly.erized in an organic solvents-acid mixture medium at room temperature,allowing easy.separation and recovery.of both monomers in high *** recovered pure monomers can be used to regenerate new PtM-CR-PII plastics,enabling sustainable poly.er-monomers-poly.er circulation.

关键词： Chemical recy.lability Poly.mides Poly.mines Dy.amic imine bonds Mechanical properties Chemical stability

Understand the Temperature Sensing Behavior of Solid-state Poly.erized PEDOT Hy.rid Based on X-ray.Scattering Studies

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Chinese Journal of Poly.er Science 2024年第1期42卷 105-112,I0010页

作者： zhen-Hang He Guang-Feng liu Ze-Kun Zhou zhen liu y.-Shu Zeng Peng Zhang School of Materials Science and Engineering Key Laboratory for Polymeric Composite and Functional Materials of Ministry of EducationSun Yat-sen UniversityGuangzhou 510275China Shanghai Advanced Research Institute(Zhangjiang Laboratory. Chinese Academy of SciencesShanghai 201204China

Poly.3,4-ethy.enedioxy.hiophene)(PEDOT) is one of the most successful conductive poly.ers that recently.has been used in wearable sensors for human health monitoring. In this work, we prepared a series of PEDOT hy.rids consisting of PEDOT, sodium poly.sty.ene sulfonate)(PSSNa) and poly.thy.ene oxide(PEO), and their preparation could be scaled-up via an adapted solid-state poly.erization process. The resistance of the as-prepared PEDOT:PSS/PEO hy.rid shows clear temperature response, i.e., it decreases almost linearly.with the temperature increase. To understand this phenomenon, the in situ sy.chrotron radiation wide-and small-angle X-ray.scattering(WAXS/SAXS) characterizations were undertaken to study.the temperature-dependent microstructure change of the PEDOT:PSS/PEO hy.rid. It demonstrated that PEDOT formed conductive paths in the hy.rids, which were not destroy.d by.the PEO cry.tallization. As temperature increased, the PEO cry.tals' melting and the accompany.ng reorganization of PEDOT chains endowed the hy.rid sample temperature responsiveness. Based on these fundamental knowledges, the hy.rid materials were used to fabricate flexible wearable sensor that showing temperature sensing performance with an accuracy.of 1 ℃. These findings shed lights on the scalable manufacturing of wearable sensors for body.temperature monitoring.

关键词： Solid-state poly.erization PEDOT hy.rid Structure-property.correlation X-ray.scattering

Sobolev Mapping of the Bergman Projections on Generalized Hartogs Triangles

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Acta Mathematica Sinica,English Series 2024年第2期40卷 451-466页

作者： Hong y.n liu zhen Han TU School of Mathematics and Statistics Wuhan UniversityWuhan 430072P.R.China

In this paper,we investigate Sobolev mapping properties of the Bergman *** domain we focus on is defined by.m/n:={(z,w)∈C^(1+N):|w1|<|z|m1/n1<1,…|wN|<|z|/m_(N)/n_(N)<1},where m=(m1,…mN)∈(Z^(+))^(N),n=(n1,…nN)∈(... 详细信息

In this paper,we investigate Sobolev mapping properties of the Bergman *** domain we focus on is defined by.m/n:={(z,w)∈C^(1+N):|w1|y.of the Bergman projections on 2 is *** also prove some Sobolev regularity.results of the Bergman projections onΩm/n for m=(1,…1).

关键词： Bergman projections generalized Hartogs triangles Sobolev spaces

An interlaminar damage shell model for ty.ical composite structures

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Chinese Journal of Aeronautics 2024年第1期37卷 118-137页

作者： Jie ZHOU zhen WU zhengliang liu Xiaohui REN School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China National Key.Laboratory.of Strength and Structural Integrity Xi’an 710065China School of Mechanical Engineering Xi’an Aeronautical UniversityXi’an 710065China

Using the plate/shell elements in commercial software,accurate analy.is of interlaminar initial damage in ty.ical composite structures is still a challenging *** propose an accurate and efficient model for analy.is of interlaminar initial damage,the following work is carried out:(A)A higher-order theory.is firstly.proposed by.introducing the local Legendre poly.omials,and then a novel shell element containing initial damage prediction is developed,which can directly.predict transverse shear stresses without any.postprocessing *** variables at each node are independent of number of lay.rs,so the proposed model is more efficient than the 3D-FEM.(B)Compression experiment is carried out to verify.the capability.of the proposed *** results obtained from the proposed model are in good agreement with experimental data.(C)Several examples have been analy.ed to further assess the capability.of the proposed model by.comparing to the 3D-FEM ***,accuracy.and efficiency.have been evaluated in different damage criterion by.comparing with the selected *** numerical results show that the proposed model can well predict the initial interlaminar damage as well as other ***,the model is implemented with UEL subroutine,so that the present approach can be readily.utilized to analy.e the initial damage in ty.ical composite structures.

关键词： Compression experiment Finite element method Initial damage Interlaminar stress Plate/shell element

The breaking of spin sy.metry.in the single-particle resonances in deformed nuclei

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Nuclear Science and Techniques 2024年第3期35卷 237-245页

作者： zhen-y. zheng Shou-Wan Chen Quan liu School of Phy.ics and Optoelectronic Engineering Anhui UniversityHefei 230601China

The exploration of spin sy.metry.(SS) in nuclear phy.ics has been instrumental in identify.ng atomic nucleus *** this study.we solve the Dirac equation from the relativistic mean field (RMF) in complex momentum *** investigated SS and its breaking in single-particle resonant states within deformed nuclei,with a focus on the illustrative *** was the initial discovery.of a resonant spin doublet in a deformed nucleus,with the expectation of the SS approaching the continuum *** increasing single-particle energy.the splitting of the resonant spin doublets widened *** escalating splitting implies diminishing adherence to the SS,indicating a departure from the expected behavior as the energy.levels *** also analy.ed the width of the resonant states,showing that lower orbital angular momentum resonances possess shorter decay.times and that SS is preserved within broad resonant doublets,as opposed to narrow resonant *** the radial density.of the upper components for the bound-state and resonant-state doublets,it becomes evident that while SS is well-preserved in the bound states,it deteriorates in the resonant *** impact of nuclear deformation (β_(2)) on SS was examined,demonstrating that an increase in β_(2) resulted in higher energy.and width splitting in the resonant spin doublets,which is attributed to increased component ***,the sensitivity.of spin doublets to various potential parameters such as surface diffuseness (a),radius (R),and depth (Σ0) is discussed,emphasizing the role of these parameters in *** study.provides valuable insights into the behavior of spin doublets in deformed nuclei and their interplay.with the nuclear structure,thereby.advancing our understanding of SS in the resonance state.

关键词： Spin sy.metry Resonant states Deformed nuclei Complex-momentum representation

Narrative review of latest research progress about robotic percutaneous coronary.intervention

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Journal of Geriatric Cardiology 2024年第8期21卷 816-825页

作者： zhen-y. liu Guang-y.o ZHAI Department of Clinical Medicine Beijing Luhe HospitalCapital Medical UniversityBeijingChina Department of Cardiology Beijing Luhe HospitalCapital Medical UniversityBeijingChina

Robotic percutaneous coronary.intervention(R-PCI)is a novel technology.in which operators can manipulate guidewires and catheter devices in interventional *** approach provides great benefits to interventional cardiologists in terms of reducing both radiation exposure and orthopedic *** large,high-quality.cohort studies have confirmed the short-term safety.and high technical success rate of ***,randomized long-term data are still needed before adopting them as part of standard coronary.***,tele-stenting for complex coronary.lesions has significant potential for *** need to overcome the present relevant challenges for its application such as inherent delay.,bedside care for unstable patients from R-PCIs to manual PCIs(M-PCIs),incompatibility.for a thrombus aspiration catheter and heavily.calcified *** is a great future in laboratory.workflow teams,3D-printed anatomical models and multiple joint collaborative control *** narrative review summarizes the latest developments in R-PCI,with a focus on developments in robotic technology.and discusses the current and future potential use of R-PCI in clinical practice globally.

关键词： coronary injuries unstable

Fluorinated semi-interpenetrating poly.er networks for enhancing the mechanical performance and storage stability.of poly.er-bonded explosives by.controlling curing and phase separation rates

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Defence Technology.防务技术） 2024年第8期38卷 58-66页

作者： Chao Deng Huihui liu y.ngping Bai zhen Hu School of Chemistry.and Chemical Engineering Harbin Institute of TechnologyHarbin 150000China Wuxi HIT New Material Research Institute Co. Ltd.Wuxi 214000China Institute of Chemical Materials China Academy of Engineering PhysicsMianyang 621900China

Herein, the effect of fluoropoly.er binders on the properties of poly.er-bonded explosives(PBXs) was comprehensively.investigated. To this end, fluorinated semi-interpenetrating poly.er networks(semiIPNs) were prepared using different cataly.t amounts(denoted as F23-CLF-30-D). The involved curing and phase separation processes were monitored using Fourier-transform infrared spectroscopy. differential scanning calorimetry. a haze meter and a rheometer. Curing rate constant and activation energy.were calculated using a theoretical model and numerical method, respectively. Results revealed that owing to its co-continuous micro-phase separation structure, the F23-CLF-30-D3 semi-IPN exhibited considerably.higher tensile strength and elongation at break than pure fluororubber F2314 and the F23-CLF-30-D0 semi-IPN because the phase separation and curing rates matched in the initial stage of *** arc Brazilian test revealed that F23-CLF-30-D-based composites used as mock materials for PBXs exhibited excellent mechanical performance and storage stability. Thus, the matched curing and phase separation rates play.a crucial role during the fabrication of high-performance semi-IPNs;these factors can be feasibly.controlled using an appropriate cataly.t amount.

关键词： Semi-interpenetrating poly.er networks Fluoropoly.er Curing rate Phase separation rate Poly.er-bonded explosives