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Without sufficient prior knowledge the identification of the optimal cluster numbers is a difficult problem for unsupervised clustering. Since fuzzy entropy is essential for measuring the information of fuzzy sets, a combined fuzzy entropy index (CFE) is developed for searching the best number of clusters kb. The CFE involves the compactness and the separation of clusters both in the data space and...
Due to the uncertainty of major influential factors in emergency logistics transportation path optimization, this paper intends to describe those uncertain factors, such as the transportation time, the safety factor and the transportation costs, etc. by using trapezoidal fuzzy numbers. And then the paper establishes a multi-objective optimization model according to the previous described decision-making...
One of the most difficult problems in cluster analysis is how many clusters are appropriate for the description of a given system. In this paper, a novel dynamic genetic clustering algorithm (DGCA) is proposed to automatically search for the best number of clusters and the corresponding partitions. In the DGCA, a maximum attribute range partition approach is used in the population initialization in...
SaaS (Software as a Service) is a kind of application services which is provided via Internet, and customers can order and receive their peculiar types of software application services from the SaaS provider via the Internet according to their actual needs. This paper analysis current development of SaaS, by means of comparing SaaS model with traditional software model, a new engineering method is...
The key of PID control systematic optimization design is PID parameter optimization. Traditional PID controller parameter adopt experiment to add the way of trying to carry out optimization by man. It is fairly time-consuming, PID controller have no self-adaptive ability, can only rely on artificial optimization parameter. This paper puts forward a kind of algorithm to select the PID parameters based...
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