The operation optimization of LNG supply chain is increasingly crucial. This paper investigates the operation optimization of LNG supply chain. The minimum total cost of the new LNG supply chain is set as the objective function. Under the constraints of station construction, route selection, equipment purchase, node flow balance, and service radius, a mixed integer linear programming (MILP) model is established. Finally, it can determine the liquefaction scheme of gas source, intermediate node construction scheme, reserve storage scheme, transportation scheme, purchase scheme of different equipment, etc. A practical case is used to illustrate the reliability of the model. The results show the proposed model can provide an admission of LNG production, transportation, and marketing business for natural gas-related enterprises, and also can help the government to coordinate resources.
University ranking has a positive impact on making rational use of educational resources and promoting deep-seated development of higher education and colleges and universities. This paper establishes two models to rank universities in the Yangtze River Delta: Model A uses AHP to analyze 8 main evaluation indicators; model B adopts the entropy weight method with reference to the data of the evaluation authority. In the results of the models, the ranking of top 20 universities in the Yangtze River Delta region is basically same. Comparing the two models, model B refers to the rankings of authoritative institutions, has obvious advantages over model A in terms of solution scale and model complexity, so the calculation results of model B are finally adopted. The models can not only rank the comprehensive strength of colleges and universities, but also be used to optimize the college applications and make better choices for the healthy progress of higher education.
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