Traditional identity authentication solutions mostly rely on a trusted central entity, so they cannot handle single points of failure well. In addition, most of these traditional schemes need to store a large amount of identity authentication or public key information, which makes the schemes difficult to expand and use in distributed situations. In addition, the user prefers to protect the privacy of their information during the identity verification process. Due to the open and decentralized nature of the blockchain, the existing identity verification schemes are difficult to apply well in the blockchain. To solve this problem, in this article, we propose a privacy protection identity authentication scheme based on the blockchain. The user independently generates multiple-identity information, and these identities can be used to apply for an identity certificate. Authorities use the ECDSA signature algorithm and the RSA encryption algorithm to complete the distribution of the identity certificate based on the identity information and complete the registration of identity authentication through the smart contract on the blockchain. On the one hand, it can realize the protection of real identity information; on the other hand, it can avoid the storage overhead caused by the need to store a large number of certificates or key pairs. Due to the use of the blockchain, there is no single point of failure in the authentication process, and it can be applied to distributed scenarios. The security and performance analysis show that the proposed scheme can meet security requirements and is feasible.

Simply according to the investment scale of distributed photovoltaic power station builders, the subdivision of the builder fails to fully consider their potential value, thus underestimating the contribution of the builder to the e-commerce platform. This paper constructs the value index evaluation system of the distributed photovoltaic power station from the current value and potential value of the builders. Based on the objective data of the builders and the clustering algorithm, this paper establishes a two-dimensional subdivision model of the builders based on the current value and potential value of the builders. This paper proposes specific marketing strategies for the value characteristics of each type of builders, which provides a scientific basis for e-commerce platform marketing decisions.

In the mobile Internet era, voiceprint recognition technology is an important means of identity authentication in social, shopping, online shop, financial transactions and other activities. With the popularity of smart phones, these network activities can be carried out at anytime and anywhere. Inevitably, there are a variety of environmental noise in the voice input process of voiceprint recognition. Improving the anti-noise and robustness of voiceprint recognition system is the key to the wide application of voiceprint recognition technology. This paper focuses on the key modules of voiceprint recognition system, such as endpoint detection, feature extraction, voiceprint modeling and matching. Mainstream technologies of each module are analyzed, and a robust voiceprint recognition method is proposed. In this method, the endpoint detection algorithm based on spectrum is used, and the Empirical Mode Decomposition (EMD Empirical Mode Decomposition) algorithm is used to reconstruct the spectrum, which can effectively realize voiceprint denoising. Using the superior performance of convolution neural network (CNN) model in the field of image, the voiceprint model is constructed to improve the recognition efficiency and realize the robustness of the voiceprint recognition system.

Virtual Reality (VR) is a new computer technology used to create and experience virtual worlds. It has been widely used in aerospace military, complex equipment, automotive, BIM, medical, education and other industries. Based on the background of VR technology application and industry needs, this paper introduces the key technologies of 3D data conversion processing and high performance 3D display required to realize VR technology application.

Because of the difference of the standard and the band, a new generation of wireless networks compared with the previous network presents "high bandwidth, small coverage characteristics, the single station coverage ability is relatively weak, in the actual network construction in accordance with the previous site planning and construction, covered outdoor coverage blind spots, weak areas will be a major challenge to the new a new generation of network deployment face. In order to better meet the needs of wireless electric network construction, the system introduces Relay technology to enhance the coverage, improve the cell edge throughput. In this paper, through theoretical research, system simulation, actual comparison and so on, we compare the performance of various Relay technologies, to provide data basis for the production practice day after.