The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform

L I Henan - One of the best experts on this subject based on the ideXlab platform.

  • public key cryptosystem on Conic Curve over zn based on two hard problems
    Computers & Security, 2011
    Co-Authors: L I Henan
    Abstract:

    This paper presents a Public-key Cryptosystem on Conic Curve over Zn based on the difficulties of integer factorization and Conic Curve discrete logarithm.It is a Conic analog of the public-key cryptosystem based on two private keys.Public-key Cryptosystem on Conic Curve over Zn is better than the original cryptosystem security,for the facility of plaintext embedding and the computing of rank and point on Conic,this scheme has the advantages of speedy operation and easy realization,especially by using the NAF.

Nguyen Minh Phu - One of the best experts on this subject based on the ideXlab platform.

  • Performance Evaluation of a Solar Air Heater Roughened with Conic-Curve Profile Ribs Based on Efficiencies and Entropy Generation
    Arabian Journal for Science and Engineering, 2020
    Co-Authors: Nguyen Minh Phu, Nguyen Hap
    Abstract:

    First and second laws of thermodynamics are well-established benchmarks to assess a thermal system. The literature revealed that efficiencies of a solar air heater are still low because the transport properties and heat transfer coefficient of the air are not superior. In the previous study, the heat and fluid flow characteristics and thermohydraulic performance of the solar air heater roughened Conic-Curve profile ribs were numerically examined. In the present extended work, the thermal efficiency, effective efficiency, and exergy efficiency were analytically evaluated. The entropy generation in the vicinity of the rib and the Bejan number along the length of the absorber plate were numerically analysed. These considerations aimed to provide a comprehensive evaluation and subsequent minimization of entropy generation. The impacts of the Conic constant and Reynolds number on the above parameters were considered. The results indicated that decreasing the Conic constant induced an increase in all efficiencies and a decrease in the entropy generation number. The maximum effective efficiency of 0.6719 occurred at a Reynolds number of 20,122, whereas the exergy efficiency of 0.01527 was obtained at a Reynolds number of 2786. The highest entropy generation due to heat transfer was found at the upstream and downstream corners of a rib and at the position just behind the detachment point. The largest entropy generation due to viscous dissipation was identified at the position in front of the rib tip. The entropy generation due to heat transfer was much higher than the entropy generation due to viscous dissipation.

  • Computational fluid dynamics analysis of the heat transfer and pressure drop of solar air heater with Conic-Curve profile ribs
    Journal of Thermal Analysis and Calorimetry, 2019
    Co-Authors: Tu Thien Ngo, Nguyen Minh Phu
    Abstract:

    The present study was to investigate the effect of the Conic constants of rough geometries and the associated Reynolds numbers on the heat transfer and pressure drop of a solar air heater. An absorber plate attached to multiple Conic-Curve profile ribs was comprehensively analyzed. The results showed that decreasing the Conic constant induced an increase in the Nusselt number and a decrease in the friction factor; therefore, the thermohydraulic performance parameter increased. The friction factor was notably invariable when the Conic constant changed in the range of − 0.5 to 0. The maximum thermohydraulic performance parameter occurred at a Reynolds number of 8000, whereas the largest thermogeometric performance parameter occurred at a Reynolds number of 12,000. A regression analysis was performed for the correlations of both the Nusselt number and the friction factor as functions of the Reynolds number and the Conic constant. The correlation coefficients of the Nusselt number and friction factor equations were 0.9978 and 0.9351, respectively.

Yan Hong-bi - One of the best experts on this subject based on the ideXlab platform.

  • Multi-Secret Sharing Scheme Based on Conic Carve over Zn
    Computer Simulation, 2014
    Co-Authors: Yan Hong-bi
    Abstract:

    Secret sharing technology is one of critical technologies about key management. An efficient multilevel-secret sharing scheme was designed on the public-key cryptography of Conic Curve over Zn. The scheme made comprehensively use of difficulties in computing discrete logarithm and the intractability of reversing the one-way Hash function. In the scheme,participants can share multiple secrets and compute sub-secret for rebuilding efficiently and securely. As for the multi-secret of the different grade,the multi-secret distributer can dynamically adjust the threshold value; cheating of the dealer or any participant can he detected efficiently; identity authentication of participant can be provided; and the shadows of key can be validated.

  • Design of Multi-Policy Multiple Secret Recovery Scheme
    Journal of North University of China, 2014
    Co-Authors: Yan Hong-bi
    Abstract:

    In view of the present defects multi-policy secret recovery scheme. Based on the public-key cryptography of Conic Curve over Zn,a new efficient multi-policy secret recovery scheme was designed. The security of the new scheme was based on the difficulty in computing discrete logarithm and the intractability of reversing the oneway function. Using the scheme,the participants could share multiple secrets; the participants could be added or deleted without having to change any information of theirs; as for the multi-secret of the different grade,the multi-secret distributer could dynamically adjust the threshold value. The analysis results show that the scheme is high of security and dynamic,which can detect the cheating of the dealer or any participant,and provide identity authentication of participants,and validate the correctness of key.

Zheyu Fang - One of the best experts on this subject based on the ideXlab platform.

  • Revealing the spin optics in Conic-shaped metasurfaces
    Physical Review B, 2017
    Co-Authors: Yanjun Bao, Wei Liu, Lei Zhou, Xing Zhu, Zheyu Fang
    Abstract:

    Ellipse and hyperbola are two well-known Curves in mathematics with numerous applications in various fields, but their properties and inherent differences in spin optics are less understood. Here, we investigate the peculiar optical spin properties of the two Curves and establish a connection between their foci and the spin states of incident light by introducing a geometric-phase distribution along the Conic Curve. We show that the optical spin Hall effect is the intrinsic optical spin property of ellipse, where photons with different spin states can be exactly separated to each of its two foci, while a hyperbola exhibits optical spin-selective effect, where only photons with one particular spin state can be accumulated at its foci. These properties are then experimentally demonstrated in near field by arranging nanoslits in Conic shapes. Based on the spin properties of the Curves, we design spin-based plasmonic devices with various functionalities. Our results reveal the intrinsic optical spin properties behind Conic Curves and provide a route for designing spin-based plasmonic devices.

Fang Zheyu - One of the best experts on this subject based on the ideXlab platform.

  • Revealing the spin optics in Conic-shaped metasurfaces
    PHYSICAL REVIEW B, 2017
    Co-Authors: Bao Yanjun, Zu Shuai, Liu Wei, Zhou Lei, Zhu Xing, Fang Zheyu
    Abstract:

    Ellipse and hyperbola are two well-known Curves in mathematics with numerous applications in various fields, but their properties and inherent differences in spin optics are less understood. Here, we investigate the peculiar optical spin properties of the two Curves and establish a connection between their foci and the spin states of incident light by introducing a geometric-phase distribution along the Conic Curve. We show that the optical spin Hall effect is the intrinsic optical spin property of ellipse, where photons with different spin states can be exactly separated to each of its two foci, while a hyperbola exhibits optical spin-selective effect, where only photons with one particular spin state can be accumulated at its foci. These properties are then experimentally demonstrated in near field by arranging nanoslits in Conic shapes. Based on the spin properties of the Curves, we design spin-based plasmonic devices with various functionalities. Our results reveal the intrinsic optical spin properties behind Conic Curves and provide a route for designing spin-based plasmonic devices.National Basic Research Program of China (973 Program) [2015CB932403]; National Science Foundation of China [61422501, 11374023, 11674012, 61521004, 11474057, 11674068]; Beijing Natural Science Foundation [L140007]; Shanghai Science and Technology Committee [16JC1403100]; Foundation for the Author of National Excellent Doctoral Dissertation of PR China [201420]; National Program for Support of Top-notch Young ProfessionalsSCI(E)ARTICLE89