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Introduction
Lumbopelvic pain (LPP) is common in pregnant women and has a significant negative effect on physical and psychological health. In this study, for the first time, we conduct a meta‐analysis to estimate the overall prevalence of LPP among pregnant women and clarify the reasons for the differences in the estimated results.
Material and methods
A systematic search of four databases (PubMed,...
The full-bridge modular multilevel converter (FB-MMC) has potential applications in overhead line flexible HVDC transmission system because of its ability to block the DC fault current. But plenty of switching devices in converters result in a huge amount of calculation in electromagnetic transient simulation program and make it very slow. To solve this problem, a detailed equivalent model of the...
The study of knowledge is an important part of knowledge management. In this paper, the mathematical model of knowledge field has been built up in the way of vector field, and the Laplace's equation of knowledge potential has also been built up. This paper takes those examples to explore the solution of mathematical model of knowledge field. It figures out the rules of diffusion of knowledge under...
In this paper, we followed the development trend of service science and the idea of knowledge services. We provide kinds of socio-economic system to remove the trade barriers. Based on the existed research results on knowledge-economic field, we researched the propagation characteristics of the regional economy. At the same time, we applied the method in the research of trade between two countries...
In the face of limited educational resources, the investors are most concerned about the problem of choosing the best investing objective which can produce the utmost yield. This paper selected the first 10 universities on the basis of the statistical analysis on the resource endowment out of 88 universities and colleges in H province. Then the paper compared the potential of the knowledge field among...
The information industry can stimulate economic growth and create enormous social wealth. This paper analysis the integral part of China's information industry. At the same time, this paper researches its development status. Combining the characteristics of information industry, we find out the inadequacies of the information industrial policy. At last, this paper provides kinds of policy to promote...
BP artificial neural network simulates the human brain's neural network works, and establishes the model which can “learn”, and is able to take full advantage and accumulate of the experiential knowledge, thus minimizes the error between the optimal solution and the actual value. In this paper, the comprehensive evaluation of IT industry safe development and its trend of Province J are analyzed by...
In today's highly developed society, we are faced with many choices or decision-making problems, and a number of socio-economic factors influencing the choice of these decisions. For effective decision-making, people simulate the human brain's neural network works, and establish a learning model, which can take fully advantage of experiential knowledge accumulation and find the optimal solution and...
In this paper, the knowledge potential of knowledge field has been studied in the way of vector field, the Laplace's equation of knowledge potential has been built up, the establishment of mathematical model of knowledge potential has been explored, and the solution of mathematical model of knowledge potential is in the way of variables separation. It aimed at providing a way of quantitative analysis...
D-S theory is a popular assessment method on physical science. For this method, first, the scope of research regions should be determined, then some samples selected randomly from the sample space which is set up, so the samples quality can be assessed based on fuzzy theory. And then, the results of these assessments should be put as a ldquodifferent sources, used to assess samplerdquo multi-channel...
The application of the new algorithm for the calculating of the power quality factors is presented in the paper. To estimate their spectra and fundamental frequency, the current and voltage signals are first processed and then the power quality factors calculated. The algorithm considers frequency, amplitude and phase as unknown parameters. The proposed algorithm was evaluated using a theoretical...
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