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The requirement of electric power has been increasing greatly, and the scale of the power system is becoming larger and larger, all of which make the complex characteristics of power system more and more obvious. It is extremely urgent to have a scientific and reasonable evaluation of power system security risk. By analyzing the recent series of large-area-blackout incidents, it can be concluded that...
This paper firstly compares rough sets theory with grey system theory, then the concept of grey sets is proposed and the grey degree of grey sets and the basic relationships and operations of grey sets are defined. Next, we set up the models of grey rough sets and wide grey rough sets as well as study their properties. Moreover, the definition of rough grey sets is given and their basic characters...
Firstly, this paper expands hesitant fuzzy into grey hesitant fuzzy sets; Secondly, the “kernel and grey degree” method of grey systems is used instead of the data supplement method that traditionally presupposes the risk preferences of decision-makers. It enhances reliability on the premise of maintaining the information domain; Then we extended the “kernel and grey degree” algorithm to the decision...
To research the internal relations of fuzzy sets and gray sets, and to expand the application range of grey decisions, this paper proposes a conversion method for grey sets of intuitionistic fuzzy sets, and studies the decision-making method based on grey relation and grey possibility degree. Integrate membership grade, non-membership grade and hesitating degree into grey membership grade decision...
Guided by the theory of recycled economy, green supply chain management, as a new notion of management, plays a more and more important role in the development of manufacturing industry in Guangxi. The research on performance evaluation system for green supply chain management can set the criteria to determine whether Guangxi's manufacturing industry is driven or forced to implement green supply chain...
Traditional process capability inspection is established on the basis of large sample and actually at the beginning mass product is difficult, so in the absence of large sample, process capability making use of small sample information can also be quickly judged. In this paper, we will fully dig the small sample information, process capability judgment will be converted to an optimization constraint...
Based on the uncertainty and grey level of suppliers' efforts, the paper put forward the incentive strategy of main manufacturer sharing the suppliers' efforts cost, and established the optimal cost-sharing model under grey effort level. The paper calculated Nash equilibrium and Stackelberg equilibrium under the above incentive model, and came to the optimal proportion, the optimal effort level and...
General grey Verhulst model for sigmoid process boasts good prediction accuracy. But the prediction accuracy is not high enough for fluctuant sigmoid process. In order to improve prediction accuracy, the grey Verhulst self-memory model was established based on grey system and self-memory principle. The model can recollect the historical data and get over grey Verhulst model's shortages. Examples show...
In the paper, economic cycle monitor and early warning index system is designed. The basic contents of K-L information measure are introduced, and the approach is applied to economic index time difference analysis based on the monthly data from January 2001 to June 2007. Leading indicators, coincident indicators and lagging indicators are then determined.
Aiming at the practical background of less data and unknown probability distribution, the metabolic GM(1,1) model was proposed to predict the aviation location of mobile target such as unmanned air vehicle in the electronic information equipment test. The prediction principle of the metabolic GM(1,1) model was introduced firstly. The new location information was reinforced and the old location information...
This paper studies extended clusters of grey incidence for indexes in panel data. First, it discusses the expression of a panel data by matrix sequence, and describes its geometric characteristic through a cluster of curved surfaces. Thereafter, in three dimensional space, the paper analyzes the geometric similarity of indexes in panel data. According to the principle of grey incidence analysis, it...
One of the assumptions is that market is perfect in traditional Markowitz's portfolio selection model. But it is inconsistent with reality. So we relax its assumptions by adding liquidity factors to study investors' portfolio choice. We perform empirical analysis based on China A-shares markets. These results show that there is a notable difference in portfolio choice behavior after adding liquidity...
Applying the method of system dynamics simulation, an SD model of the interactions between industrial agglomeration and regional economic competitiveness under the leadership of the government is founded on the base of qualitative analysis on the interactions between industrial agglomeration and regional economic competitiveness. This model has been tested by the analysis of the sensitivity of the...
The allocation structure and expenditure structure of funds for science and technology in three executive bodies including colleges and universities, scientific research institutions and large and medium-sized enterprise in China are extensively studied. The utilization efficiency of the funds for science and technology in every executive body are evaluated synthetically according to their output...
The paper proposes a hybrid approach of grey rough set and probabilistic neural network for uncertain decision. Grey rough set model is tolerant of noise. By setting a level of grey degree, redundant attributes are eliminated from decision table, a minimal knowledge representation is derived and the set of rules are generated through the grey rough set model. Subsequently, the reduced decision table...
Based on public weights, an imagined grey interval DEA model is proposed to rank DMUs (decision-making units) with grey interval input and output variables. Weight vector which make the efficiency of ??vitual DMU?? achieves idea grey efficiency is treated as public weight vector. Input and output values of ??vitual DMU?? are equal to the average of all DMUs'. Further, efficiency of all DMUs is calculated...
With the economic development, the proportion of service industry is going up constantly, which has become a widely accepted rule. Recently, although the economy in our country has almost been kept the leading rising speed around the globe, the service industry has not enjoyed the rising speed as expected and its status in National Economy has not been remarkably enhanced. Apart from the reasons from...
The characteristics of fuzzy mathematics, grey systems theory, rough set theory, and the basic characteristics of incomplete information and inaccurate data in uncertain systems are analyzed. The principle of simplicity of scientific theories, methods, and models is discussed. Detailed examples show that more satisfied results can be obtained by using models involving uncertainties than by using meticulous...
The paper mainly utilizes the canonical correlation analysis and the partial correlation analysis methods. Based on the time series data in 1996-2008 and cross-section data in 2007 in Jiangsu province, an acute analysis of the science and technology talents and the development of new industries has been made. And the result reveals all kinds of professional and technical talents, personnel engaged...
We have investigated the problems about multiple criteria decision-making. Using the grey system theory, technique for order preference by similarity to ideal solution, and the vector projection synthetically, a new synthetical grey relational projection algorithm was put forward. The decision-making model in which the adjacency degree both between the projects and positive ideal one and between the...
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