A supplier evaluation model based on customer demand in blockchain tracing anti-counterfeiting platform project management

This study assesses supplier selection at the beginning of project management to establish an evaluation system corresponding to blockchain tracing anti-counterfeiting platforms(BTAP).First,this paper determines 20 evaluation criteria from the four dimensions of platform overview,core technology,application support,and operations management.On this basis,multi-criteria decision making(MCDM)based on customer needs is proposed,which consists of three main steps.First,quality function deployment(QFD)and the best and worst method(BWM)are used to evaluate the four dimensions of the BTAP and specific evaluation criteria from the perspective of customers to obtain the criteria weight.Then,this method uses the extended Vlse Kriterjumska Optimizacija I Kompromisno Resenje(VIKOR)approach to sort the alternatives.Finally,the improved decision making trial and evaluation laboratory(DEMATEL)method is used to analyse the relationships between the 20 criteria in the four dimensions.The feasibility and effectiveness of this method are verified by an example.According to the sensitivity analysis and comparative analysis,the results show that this method can evaluate blockchain anti-counterfeiting enterprises.The main conclusions are as follows:the core technology is the most impor-tant factor influencing the choice of a BTAP project,and the role of application support in evaluation cannot be ignored.

Rotary propagation characteristics of light in multimodesingle mode-multimode fiber structures using ray tracing method

The mode theory is the main way to study the propagation characteristics of light in fiber so far,but it is not suitable for analysis of light in duct.By using ray-tracing method,the rotary propagation characteristics of light in multimode-single mode-multimode(MSM) fiber structures are analyzed in this paper.Firstly,the light ray in fiber can propagate around an inscribed circle,and the central axis of this fiber is the propagation axis.Secondly,the radius of the inscribed circle is decided by both incident angle and incident position,and its variation is between 0 and RM,where RM is the radius of the multimode fiber.Lastly,the bigger the ratio of core and cladding diameter is,the higher the propagation efficiency is.