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2D materials with atomic thickness display strong gate controllability and emerge as promising materials to build area‐efficient electronic circuits. However, achieving the effective and nondestructive modulation of carrier density/type in 2D materials is still challenging because the introduction of dopants will greatly degrade the carrier transport via Coulomb scattering. Here, a strategy to control...
In order to solve the problem of instability clustering in Ad Hoc Networks with complex and changeable node motion, this paper proposes a weighted clustering algorithm based on node stability(SA-WCA). In this algorithm, we propose a node stability factor based on node received power, which does not need to calculate the specific distance between nodes and can only judge the relative motion between...
In this paper, we have proposed an optical pulse position modulation based on double-circle iteration, targeting at the next generation of high speed optical metropolitan area networks. The focuse of this paper lies on the performance of spectral efficiency, the bit error rate and chromatic dispersion. The proposed modulation format is also compared to on-off-keying(OOK) and 4-level pulse-amplitude...
In order to solve the problem of introducing additional Total Degradation (TD) in adaptive satellite system caused by fixed High Power Amplifier (HPA) operating point, the paper proposes an adaptive HPA Input Back-Off (IBO) algorithm carried out on the gateway side in the Forward Link of the system based on Adaptive Coding and Modulation (ACM) techniques. On the other hand, the traditional way of...
In order to realize the fusion of coal mine voice network, data network and video monitoring network, to improve reliability, flexibility and expansibility of safety production and management, the paper analyses the system structure of the softswitch, and researching and designing based multi-service based on softswitch of coal mine. The model of multi-service platform based on softwitch in coal mine...
In order to solve the data integrity, non-repudiation, confidentiality and operation inefficiency of the mobile e-commerce, in this paper, mobile e-commerce security model is established. The design is based on mobile e-commerce architecture, analyzing the digital signature authentication process and data security transmission procedure in the system. Delamination modularized software design method...
In order to solve the problem of security gap in the transmission of mobile E-commerce information through WAP gateway, a double layer encryption schemes based on WAP is proposed, which combines with WAP security architecture and mobile E-commerce security architecture. The data is encrypted with the public key of application server on the mobile terminal firstly, and then the encrypted data is encrypted...
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