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High-pressure triggered quantum tunneling tuning through classical percolation in a single nanowire of a binary composite

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Nano Research 2019年第6期12卷 1333-1338页

作者： Sudeshna Samanta mokwon lee Deok-Soo Kim Jaeyong Kim Lin Wang Center for High Pressure Science & Technology Advanced Research Shanghai 201203China HYU-HPSTAR-CIS High Pressure Research Center Department of PhysicsHanyang UniversitySeoul 04763Republic of Korea Voronoi Diagram Research Center School of Mechanical EngineeringHanyang UniversitySeoul 04763Republic of Korea

In the era of miniaturization,the one-dimensional nanostructures presented numerous possibilities to realize operational nanosensors and devices by tuning their electrical transport *** size reduction,the physical properties of materials become extremely challenging to characterize and understand due to the complex interplay among structures,surface properties,strain effects,distribution of grains,and their internal coupling *** this report,we demonstrate the fabrication of a single metal-carbon composite nanowire inside a diamondanvil-cell and examine the in situ pressure-driven electrical transport *** nanowire manifests a rapid and reversible pressure dependence of the strong nonlinear electrical conductivity with significant zero-bias differential conduction revealing a quantum tunneling dominant carrier transport *** fully rationalize our observations on the basis of a metal-carbon framework in a highly compressed nanowire corroborating a quantum-tunneling boundary,in addition to a classical percolation boundary that exists beyond the percolation *** structural phase progressions were monitored to evidence the pressure-induced shape reconstruction of the metallic grains and modification of their intergrain interactions for successful explanation of the electrical transport *** pronounced sensitivity of electrical conductivity to an external pressure stimulus provides a rationale to design low-dimensional advanced pressure sensing devices.

关键词： single metal-carbon nanowire high pressure electrical transport Voronoi diagram

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The Barycenter Property for Robust and Generic Diffeomorphisms

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Acta Mathematica Sinica,English Series 2016年第8期32卷 975-981页

作者： Manseob lee Department of Mathematics Mokwon University

Let f ： Md →Md（d 〉 2） be a diffeomorphism on a compact C^∞ manifold on M. If a diffeomorphism f belongs to the Cl-interior of the set of all diffeomorphisms having the barycenter property, then f is Ω-stable. Moreover, if a generic diffeomorphism f has the barycenter property, then f is 12-stable. We also apply our results to volume preserving diffeomorphisms.

关键词： Barycenter property robust generic hyperbolic Axiom A Anosov

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A GENERALIZED LIPSCHITZ SHADOWING PROPERTY FOR FLOWS

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Acta Mathematica Scientia 2023年第1期43卷 259-288页

作者：韩波 Manseob lee LMIB of the Ministry of Education School of Mathematical SciencesBeihang UniversityBeijing100191China Department of Marketing Big Data and Mathematics Mokwon UniversityDaejeon35349Korea

In this paper,we define a generalized Lipschitz shadowing property for flows and prove that a flowΦgenerated by a C1vector field X on a closed Riemannian manifold M has this generalized Lipschitz shadowing property i... 详细信息

关键词： flow Perron property hyperbolicity generalized Lipschitz shadowing property structural stability

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Diffeomorphisms with C^1-stably Average Shadowing

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Acta Mathematica Sinica,English Series 2013年第1期29卷 85-92页

作者： Manseob lee Xiao WEN Department of Mathematics Mokwon University The School of Mathematical and System Sciences Beihang University

Let M be a closed smooth manifold M, and let f ： M → M be a diffeomorphism. In this paper, we consider a nontrivial transitive set A of f. We show that if f has the C^1-stably average shadowing property on A, then A... 详细信息

关键词： Average shadowing dominated splitting transitive set average pseudo-orbit

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SHADOWING,EXPANSIVENESS AND SPECIFICATION FOR C^1-CONSERVATIVE SYSTEMS

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Acta Mathematica Scientia 2015年第3期35卷 583-600页

作者： Mario BESSA Manseob lee 文晓 Universidade da Beira Interior Rua Marques d'Avila e Bolama Department of Mathematics Mokwon University The School of Mathematics and Systems Science Beihang University

We prove that a Cl-generic volume-preserving dynamical system （diffeomor- phism or flow） has the shadowing property or is expansive or has the weak specification property if and only if it is Anosov. Finally, as in [10, 27], we prove that the Cl-robustness, within the volume-preserving context, of the expansiveness property and the weak specifica- tion property, imply that the dynamical system （diffeomorphism or flow） is Anosov.

关键词： Shadowing expansiveness specification generic Anosov volume-preserving star systems

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Stable Weakly Shadowable Volume-preserving Systems Are Volume-hyperbolic

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Acta Mathematica Sinica,English Series 2014年第6期30卷 1007-1020页

作者： Mrio BESSA Manseob lee Sandra VAZ Universidade da Beira Interior Rua Marquês d’vila e Bolama 6201-001 Covilh Portugal Department of Mathematics Mokwon University Daejeon 302-729 Republic of Korea

We prove that any C1-stable weakly shadowable volume-preserving diffeomorphism defined on a compact manifold displays a dominated splitting E ⊕ F. Moreover, both E and F are volume-hyperbolic. Finally, we prove the version of this result for divergence-free vector fields. As a consequence, in low dimensions, we obtain global hyperbolicity.

关键词： Weak shadowing dominated splitting hyperbolicity

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Energy efficient mechanism using flexible medium access control protocol for hybrid wireless sensor networks

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Journal of Central South University 2013年第8期20卷 2165-2174页

作者： SUN Ning JEONG Yoon-su lee Sang-ho Department of Computer Science Chungbuk National University Department of Information Communication Engineering Mokwon University

Energy efficiency is a primary consideration in a wireless sensor network (WSN). This is also a major parameter when designing a medium access control (MAC) protocol for WSNs. Hierarchical clustering structure is regarded suitable for WSNs due to its good performance in energy conservation. In this work, an adequately flexible mechanism for clustering WSNs is designed, in which some creative or promotional metrics are utilized, such as cluster head selection algorithm, cluster optional reconstruction, interested data transmission, multiple path routing protocol. All these strategies were cooperated to maximize energy saving of whole system. An appropriate MAC protocol for this mechanism is proposed, by flexibly switching the status of diverse sensor nodes in different strategies. The simulation results show that the proposed MAC protocol is suitable for clustering WSNs and performs well in aspects of energy efficiency, flexibility and scalability.

关键词： MAC protocol energy conservation flexibility re-clustering wireless sensor network

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Efficient and secure source authentication scheme for multicast user authentication

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Journal of Central South University 2013年第10期20卷 2741-2746页

作者： JEONG Yoon-su lee Sang-hyuk SHIN Seung-soo Department of Information Communication Engineering Mokwon University Department of Electrical and Electronic Engineering Xi’an Jiaotong-Liverpool University Department of Information Security Tongmyong University

Multicast technology application has been widely utilized in broadband internet. Source authentication is one of the most needs for many multicast applications transferring real-time information such as stream video and online news. Because multicast current services provided to the group members are changed dynamically, data transferring by a group member is not used by the recipient. In order to verify the identity of the sender who sent the packet and to make sure that the data have not been tampered, an optimized source authentication scheme has been proposed to transfer the authentication information not to the next-door packet. The proposed method for multiple packets authenticates the source with a limited number of electronic signatures. The proposed method can reduce overhead compared to the method by adding a digital signature for every packet. In addition, by sending the generated electronic signature to the first packet and the last packet, it prevents the loss of consecutive packets, as well as a source authentication can be provided in real-time services.

关键词： multicast packet source authentication broadband Internet

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Solution and Stability of a Cubic Functional Equation

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Acta Mathematica Sinica,English Series 2010年第7期26卷 1255-1262页

作者： Kil Woung JUN Sang Baek lee Won Gil PARK Department of Mathematics Chungnam National University Department of Mathematics Education College of EducationMokwon University

In this paper, we investigate the general solution and the stability of a cubic functional equation f（x ＋ ny）＋ f（x - ny）＋ f（nx） = n^2 f（x ＋ y）＋ n^2 f（x - y）＋（n^3 - 2n^2 ＋ 2）f（x）,where n ≥ 2 i... 详细信息

关键词： Hyers-Ulam stability cubic functional equation alternative of fixed point

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Journal of Central South University 2014年第9期21卷 3534-3540页

作者： lee Sang-hyuk YAN Sun JEONG Yoon-su SHIN Seung-soo Department of Electrical and Electronic Engineering Xi'an Jiaotong-Liverpool University International Business School Suzhou Xi'an Jiaotong-Liverpool University Department of Information Communication Engineering Mokwon University Department of Information Security Tongmyong University

Information analysis of high dimensional data was carried out through similarity measure application. High dimensional data were considered as the a typical structure. Additionally, overlapped and non-overlapped data were introduced, and similarity measure analysis was also illustrated and compared with conventional similarity measure. As a result, overlapped data comparison was possible to present similarity with conventional similarity measure. Non-overlapped data similarity analysis provided the clue to solve the similarity of high dimensional data. Considering high dimensional data analysis was designed with consideration of neighborhoods information. Conservative and strict solutions were proposed. Proposed similarity measure was applied to express financial fraud among multi dimensional datasets. In illustrative example, financial fraud similarity with respect to age, gender, qualification and job was presented. And with the proposed similarity measure, high dimensional personal data were calculated to evaluate how similar to the financial fraud. Calculation results show that the actual fraud has rather high similarity measure compared to the average, from minimal 0.0609 to maximal 0.1667.

关键词： high dimensional data similarity measure difference neighborhood information financial fraud

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