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A novel fractional order variable structure multivariable grey prediction model with optimal differential background-value coefficients and its performance comparison analysis Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2024-02-09 Chao Xia, Bo Zeng, Yingjie Yang
Purpose Traditional multivariable grey prediction models define the background-value coefficients of the dependent and independent variables uniformly, ignoring the differences between their physical properties, which in turn affects the stability and reliability of the model performance. Design/methodology/approach A novel multivariable grey prediction model is constructed with different background-value
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Damping accumulated discrete MGM(1, m) power model and its application to forecasting agricultural output value share and employment share Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2024-02-06 Liangshuai Li, Dang Luo
Purpose The damping accumulated discrete MGM(1, m) power model is proposed for the problem of forecasting the share of agricultural output value and the share of employment in China. Design/methodology/approach In this study, the damping accumulated discrete MGM(1, m) power model was developed based on the idea of discrete modelling by introducing a damping accumulated generating operator and power
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Seasonal electricity consumption forecasting: an approach with novel weakening buffer operator and fractional order accumulation grey model Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2024-01-15 Chuanmin Mi, Xiaoyi Gou, Yating Ren, Bo Zeng, Jamshed Khalid, Yuhuan Ma
Purpose Accurate prediction of seasonal power consumption trends with impact disturbances provides a scientific basis for the flexible balance of the long timescale power system. Consequently, it fosters reasonable scheduling plans, ensuring the safety of the system and improving the economic dispatching efficiency of the power system. Design/methodology/approach First, a new seasonal grey buffer operator
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A new grey relational analysis model of cross-sequences Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2024-01-11 Sifeng Liu, Ningning Lu, Zhongju Shang, R.M. Kapila Tharanga Rathnayaka
Purpose The purpose of this paper is to explore a new approach to solve the problem of positive and negative offset in the calculation process of integral elements, then propose a series of new grey relational degree model for cross sequences. Design/methodology/approach The definitions of cross sequences and area elements have been proposed at first. Then the concept of difference degree between sequences
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Grey angle cosine relational degree model based on generalized greyness of interval grey number Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-12-26 Li Zhang, Xican Li
Purpose Aim to the limitations of grey relational analysis of interval grey number, based on the generalized greyness of interval grey number, this paper tries to construct a grey angle cosine relational degree model from the perspective of proximity and similarity. Design/methodology/approach Firstly, the algorithms of the generalized greyness of interval grey number and interval grey number vector
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A new adaptive grey seasonal model for time series forecasting tasks Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-12-25 Ran Wang, Yunbao Xu, Qinwen Yang
Purpose This paper intends to construct a new adaptive grey seasonal model (AGSM) to promote the application of the grey forecasting model in quarterly GDP. Design/methodology/approach Firstly, this paper constructs a new accumulation operation that embodies the new information priority by using a hyperparameter. Then, a new AGSM is constructed by using a new grey action quantity, nonlinear Bernoulli
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Assembly line balancing and capacity evaluation based on interval grey processing time Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-12-25 Zihan Dang, Naiming Xie
Purpose Assembly line is a common production form and has been effectively used in many industries, but the imprecise processing time of each process makes production line balancing and capacity forecasting the most troublesome problems for production managers. In this paper, uncertain man-hours are represented as interval grey numbers, and the optimization problem of production line balance in the
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The evaluation of grey relative incidence Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-12-19 Marcin Nowak, Marta Pawłowska-Nowak, Małgorzata Kokocińska, Piotr Kułyk
Purpose With the use of the grey incidence analysis (GIA), indicators such as the absolute degree of grey incidence (εij), relative degree of grey incidence (rij) or synthetic degree of grey incidence (ρij) are calculated. However, it seems that some assumptions made to calculate them are arguable, which may also have a material impact on the reliability of test results. In this paper, the authors
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An integrated G-MACONT approach for healthcare supplier selection Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-12-12 Santonab Chakraborty, Rakesh D. Raut, T.M. Rofin, Shankar Chakraborty
Purpose Supplier selection along with continuous evaluation of their performance is a crucial activity in healthcare supply chain management for effective utilization of scarce resources while providing quality service at an affordable price, and minimizing chances of stock-out, avoiding serious consequences on the illness or fatality of the patients. Presence of both qualitative and quantitative evaluation
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Quality analysis of range hood impeller automated assembly based on generalized grey relational degree Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-12-12 M.A. Xianglin, Haochen Cai, Qiming Yang, Gang Wang, Kun Mao
Purpose This paper establishes a quality model for automation assembly of range hood impeller based on generalized grey relational degree, it improves the debugging efficiency of the newly developed assembly workstation. Design/methodology/approach First, spot check the trial production impellers and obtain three indexes that reflect the assembly quality of the impellers. Then, analyze the parameters
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Dynamic multi-attribute grey target group decision model based on quantum-like Bayesian networks Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-11-29 Na Zhang, Haiyan Wang, Zaiwu Gong
Purpose Grey target decision-making serves as a pivotal analytical tool for addressing dynamic multi-attribute group decision-making amidst uncertain information. However, the setting of bull's eye is frequently subjective, and each stage is considered independent of the others. Interference effects between each stage can easily influence one another. To address these challenges effectively, this paper
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A novel quality risk evaluation framework for complex equipment development integrating PHFS-QFD and grey clustering Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-11-28 Huan Wang, Daao Wang, Peng Wang, Zhigeng Fang
Purpose The purpose of this research is to provide a theoretical framework for complex equipment quality risk evaluation. The primary aim of the framework is to enhance the ability to identify risks and improve risk control efficiency during the development phase. Design/methodology/approach A novel framework for quality risk evaluation in complex equipment is proposed, which integrates probabilistic
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An optimal wavelet transform grey multivariate convolution model to forecast electricity demand: a novel approach Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-11-14 Flavian Emmanuel Sapnken, Mohammed Hamaidi, Mohammad M. Hamed, Abdelhamid Issa Hassane, Jean Gaston Tamba
Purpose For some years now, Cameroon has seen a significant increase in its electricity demand, and this need is bound to grow within the next few years owing to the current economic growth and the ambitious projects underway. Therefore, one of the state's priorities is the mastery of electricity demand. In order to get there, it would be helpful to have reliable forecasting tools. This study proposes
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Memory-dependent derivative grey Bernoulli model and its application in electricity generation forecast Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-11-10 Yonghong Zhang, Shouwei Li, Jingwei Li, Xiaoyu Tang
Purpose This paper aims to develop a novel grey Bernoulli model with memory characteristics, which is designed to dynamically choose the optimal memory kernel function and the length of memory dependence period, ultimately enhancing the model's predictive accuracy. Design/methodology/approach This paper enhances the traditional grey Bernoulli model by introducing memory-dependent derivatives, resulting
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An intuitionistic fuzzy grey-Markov method with application to demand forecasting for emergency supplies during major epidemics Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-11-06 Zhiying Wang, Hongmei Jia
Purpose Forecasting demand of emergency supplies under major epidemics plays a vital role in improving rescue efficiency. Few studies have combined intuitionistic fuzzy set with grey-Markov method and applied it to the prediction of emergency supplies demand. Therefore, this article aims to establish a novel method for emergency supplies demand forecasting under major epidemics. Design/methodology/approach
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Enterprise blockchain solutions for vibrant construction ecosystem: Grey Ordinal Priority Approach Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-11-02 Mahsa Sadeghi, Amin Mahmoudi, Xiaopeng Deng, Leila Moslemi Naeni
Purpose The aim of this article states that in each stage of the industrial revolution, only a few initiatives have been real game changers. In Industry 3.0, “Internet of Information” has transformed the business landscape via connectivity and communications. Enterprises could come together to spur innovation in a cooperative or competitive manner. In Industry 4.0, the “Internet of Value” has shown
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A matrixed nonlinear exponential grey Bernoulli model for interval number prediction of crude oil futures prices Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-10-23 Haoze Cang, Xiangyan Zeng, Shuli Yan
Purpose The effective prediction of crude oil futures prices can provide a reference for relevant enterprises to make production plans and investment decisions. To the nonlinearity, high volatility and uncertainty of the crude oil futures price, a matrixed nonlinear exponential grey Bernoulli model combined with an exponential accumulation generating operator (MNEGBM(1,1)) is proposed in this paper
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Use of AHP and grey fixed weight clustering to assess the maturity level of strategic communication management in Brazilian startups Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-10-11 Thiago Rodrigues Timóteo, Gustavo Tietz Cazeri, Gustavo Hermínio Salati Marcondes de Moraes, Tiago F.A.C. Sigahi, Lucas Gabriel Zanon, Izabela Simon Rampasso, Rosley Anholon
Purpose The aim of this research was to evaluate the maturity level of strategic communication management implemented by Brazilian startups. Design/methodology/approach This study employed the analytic hierarchy process (AHP), survey and Grey Fixed Weight Clustering modeling techniques. Three experts with extensive academic and practical experience in the subject participated in the AHP process, providing
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Forecasting Chinese carbon emission intensity based on the interactive effect GM(1,N) power model Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-10-11 Yuhong Wang, Qi Si
Purpose This study aims to predict China's carbon emission intensity and put forward a set of policy recommendations for further development of a low-carbon economy in China. Design/methodology/approach In this paper, the Interaction Effect Grey Power Model of N Variables (IEGPM(1,N)) is developed, and the Dragonfly algorithm (DA) is used to select the best power index for the model. Specific model
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Multi-stage skewed grey cloud clustering model and its application Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-10-06 Jie Yang, Manman Zhang, Linjian Shangguan, Jinfa Shi
Purpose The possibility function-based grey clustering model has evolved into a complete approach for dealing with uncertainty evaluation problems. Existing models still have problems with the choice dilemma of the maximum criteria and instances when the possibility function may not accurately capture the data's randomness. This study aims to propose a multi-stage skewed grey cloud clustering model
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Grey clustering and grey ranking of bank branches based on grey efficiency Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-09-15 Tooraj Karimi, Mohamad Ahmadian
Purpose Competition in the banking sector is more complex than in the past, and survival has become more difficult than before. The purpose of this paper is to propose a grey methodology for evaluating, clustering and ranking the performance of bank branches with imprecise and uncertain data in order to determine the relative status of each branch. Design/methodology/approach In this study, the two-stage
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Forecast combination using grey prediction with fuzzy integral and time-varying weighting in tourism Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-08-15 Yi-Chung Hu
Purpose Tourism demand forecasting is vital for the airline industry and tourism sector. Combination forecasting has the advantage of fusing several forecasts to reduce the risk of inappropriate model selection for analyzing decisions. This paper investigated the effects of a time-varying weighting strategy on the performance of linear and nonlinear forecast combinations in the context of tourism.
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Applying claim reduction criteria in selecting efficient contractors with the two-step grey data envelopment analysis approach Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-08-04 Hamid Asnaashari, Abbas Sheikh Aboumasoudi, Mohammad Reza Mozaffari, Mohammad Reza Feylizadeh
Purpose The application of correct contractor selection strategies leads to the selection of a qualified contractor and, as a result, the on-time delivery of the project with the desired quality and within the predetermined budgetary constraints. For this reason, evaluating and qualifying contractors before reviewing the proposed prices has been considered an important issue. One factor that disrupts
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A grey ordinal priority approach for healthcare waste disposal location selection Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-07-31 Santonab Chakraborty, Rakesh D. Raut, T.M. Rofin, Shankar Chakraborty
Purpose Increasing public consciousness and demand for sustainable environment make selection of a safe location for effective disposal of healthcare waste (HCW) a challenging issue. This problem becomes more complicated due to involvement of multiple decision makers having varying knowledge and interest, conflicting quantitative and qualitative evaluation criteria, and presence of several alternative
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Evaluation analysis and promotion paths of regional green innovation vitality in China Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-07-18 Wenhao Zhou, Hailin Li, Liping Zhang, Huimin Tian, Meng Fu
Purpose The purpose of this work is to construct a grey entropy comprehensive evaluation model to measure the regional green innovation vitality (GIV) of 31 provinces in China. Design/methodology/approach The traditional grey relational proximity and grey relational similarity degree are integrated into the novel comprehensive grey evaluation framework. The evaluation system of regional green innovation
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Research on the properties of separable binary functions Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-07-14 Zhi Cheng Jiang, Yong Wei
Purpose According to the fact that the single function transformation which can both reduce the class ratio dispersion and keep the relative error no enlargement after the inverse transformation does not exist, this paper provides the separable binary function transformation F(x(k),k)=f(x(k))⋅g(k). The authors select the appropriate f(x(k)) and g(k) to get F(x(k),k)=f(x(k))⋅g(k). The sequence {F(x(k)
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The modified model for hyperspectral estimation of soil organic matter using positive and inverse grey relational degree Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-07-14 Guozhi Xu, Xican Li, Hong Che
Purpose In order to improve the estimation accuracy of soil organic matter, this paper aims to establish a modified model for hyperspectral estimation of soil organic matter content based on the positive and inverse grey relational degrees. Design/methodology/approach Based on 82 soil sample data collected in Daiyue District, Tai'an City, Shandong Province, firstly, the spectral data of soil samples
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Single machine scheduling with interval grey processing time Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-07-12 Naiming Xie, Yuquan Wang
Purpose This paper aims to investigate the grey scheduling, which is the combination of grey system theory and scheduling problems with uncertain processing time. Based on the interval grey number and its related definitions, properties, and theorems, the single machine scheduling with uncertain processing time and its general forms are studied as the research object. Then several single machine scheduling
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Evaluation of rural tourism development level based on entropy-weighted grey correlation analysis: the case of Jiangxi Province Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-07-11 Xiaoyan Yan, Min Luo, Changbiao Zhong
Purpose The purpose of this paper is to establish a more reasonable evaluation system and model for the development level of rural tourism, and provides a method for quantifying the development level of regional rural tourism. Design/methodology/approach This paper provides a method for evaluating the development level of rural tourism, constructs an evaluation index system according to the connotation
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A novel fractional multivariate GM(1,N) model with interaction effects and its application in forecasting carbon emissions from China's civil aviation Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-06-23 Mingli Hu, Lingtong Zhu
Purpose The purpose is to forecasting carbon emissions from China's civil aviation more accurately, a novel fractional multivariate GM(1,N) model with interaction effects is developed in this paper. Design/methodology/approach First, the interaction term, the trend terms are introduced in the grey action term to reflect the influence of the interaction between the system-related variables on the change
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Industrial ecological evaluation based on DPSIR and panel grey clustering model Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-06-15 Yaru Huang, Yaojun Ye, Mengling Zhou
Purpose This paper aims to build an improved grey panel clustering evaluation model and evaluate the comprehensive development potential of industrial economy, society and ecological environment in the Yangtze River Economic Belt of China. The purpose of this study is to provide some theoretical basis and tool support for management departments and relevant researchers engaged in industrial sustainable
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Application of a novel hybrid accumulation grey model to forecast total energy consumption of Southwest Provinces in China Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-06-06 Xuemei Zhao, Xin Ma, Yubin Cai, Hong Yuan, Yanqiao Deng
Purpose Considering the small sample size and non-linear characteristics of historical energy consumption data from certain provinces in Southwest China, the authors propose a hybrid accumulation operator and a hybrid accumulation grey univariate model as a more accurate and reliable methodology for forecasting energy consumption. This method can provide valuable decision-making support for policy
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Two-stage grey cloud clustering model under the panel data and its application Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-06-02 Dang Luo, Nana Zhai
Purpose The purpose of this paper is to establish a two-stage grey cloud clustering model under the panel data for the multi-attribute clustering problem with three-parameter interval grey number to evaluation of agricultural drought resistance grade of 18 cities in Henan Province. Design/methodology/approach The clustering process is divided into two stages. In the first stage: Combining variance
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A multidimensional grey relational model considering reverse indicators and its application to the influencing factors of green finance in China Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-05-17 Shuli Yan, Luting Xia
Purpose As an important measure to promote sustainable development, green finance has developed rapidly in recent years. In order to comprehensively analyze the positive and negative indicators of the influencing factors of green finance, this paper puts forward a grey relational method of spatial-temporal panel data from the perspective of the development trend of the object dimension indicators and
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Some properties of generalized greyness of interval grey number Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-05-15 Li Li, Xican Li
Purpose In order to make full use of the generalized greyness of interval grey number, this paper analyzes the properties and its applications of generalized greyness. Design/methodology/approach Firstly, the static properties of generalized greyness in bounded background domain, infinite background domain and infinitesimal background domain are analyzed. Then, this paper gives the dynamic properties
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A novel fractional-order discrete grey Gompertz model for analyzing the aging population in Jiangsu Province, China Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-04-27 Weiliang Zhang, Sifeng Liu, Lianyi Liu, R.M. Kapila Tharanga Rathnayaka, Naiming Xie, Junliang Du
Purpose China's population aging is gradually deepening and needs to be actively addressed. The purpose of this paper is to construct a novel model for analyzing the population aging. Design/methodology/approach To analyze the aging status of a region, this study has considered three major indicators: total population, aged population and the proportion of the aged population. Additionally, the authors
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Grey forecast of electricity production from coal and renewable sources in the USA, Japan and China Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-04-26 Shavkatjon Tulkinov
Purpose Electricity plays an essential role in nations' economic development. However, coal and renewables currently play an important part in electricity production in major world economies. The current study aims to forecast the electricity production from coal and renewables in the USA, China and Japan. Design/methodology/approach Two intelligent grey forecasting models – optimized discrete grey
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Learning latent dynamics with a grey neural ODE prediction model and its application Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-04-04 Flavian Emmanuel Sapnken, Khazali Acyl Ahmat, Michel Boukar, Serge Luc Biobiongono Nyobe, Jean Gaston Tamba
Purpose In this study, a new neural differential grey model is proposed for the purpose of accurately excavating the evolution of real systems. Design/methodology/approach For this, the proposed model introduces a new image equation that is solved by the Runge-Kutta fourth order method, which makes it possible to optimize the sequence prediction function. The novel model can then capture the characteristics
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A multi-objective grey hierarchical group consensus model and its application Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-03-28 Sheng-qiang Gu, Yong Liu, Weixue Diao
Purpose The paper attempts to construct a novel multi-objective grey hierarchical group consensus approach to deal with the group consensus problems consisting of hierarchical relationship and non-cooperative behaviors among decision makers (DMs). Design/methodology/approach To deal with these group consensus problems consisting of hierarchical relationship and non-cooperative behaviors among DMs non-cooperative
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Three-parameter interval grey number dynamic TOPSIS method based on comprehensive similarity Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-03-17 Meijuan Li, Jiarong Zhang, Zijie Shen
Purpose Three-parameter interval grey numbers (TPIGNs) have been extensively studied as an extended form of interval numbers. However, most existing TPIGN multi-attribute decision-making methods only consider the similarity of positions, ignore the similarity of developmental directions and focus primarily on static evaluation. To address these limitations, in this study, the authors propose a dynamic
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GERT-Q-learning model for intelligent QoS dynamic optimization of Inmarsat STN based on grey clustering of delay and delay variation Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-02-10 Chenchen Hua, Zhigeng Fang, Yanhua Zhang, Shujun Nan, Shuang Wu, Xirui Qiu, Lu Zhao, Shuyu Xiao
Purpose This paper aims to implement quality of service(QoS) dynamic optimization for the integrated satellite-terrestrial network(STN) of the fifth-generation Inmarsat system(Inmarsat-5). Design/methodology/approach The structure and operational logic of Inmarsat-5 STN are introduced to build the graphic evaluation and review technique(GERT) model. Thus, the equivalent network QoS metrics can be derived
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A new hybrid multivariate grey model based on genetic algorithms optimization and its application in forecasting oil products demand Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-02-07 Flavian Emmanuel Sapnken
Purpose Conventional statistical forecasting methods typically need a large sample size or the use of overly confident hypotheses, like the Gaussian distribution of the input data. Unfortunately, these input data are frequently scarce or do no not follow a normal distribution law. A grey forecasting model can be developed and used to predict energy consumption for at least four data points or ambiguous
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Grey fuzzy prediction model of soil organic matter content using hyper-spectral data Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-01-17 Jintao Yu, Xican Li, Shuang Cao, Fajun Liu
Purpose In order to overcome the uncertainty and improve the accuracy of spectral estimation, this paper aims to establish a grey fuzzy prediction model of soil organic matter content by using grey theory and fuzzy theory. Design/methodology/approach Based on the data of 121 soil samples from Zhangqiu district and Jiyang district of Jinan City, Shandong Province, firstly, the soil spectral data are
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A novel grey prediction model with structure variability and real domain fractional order and its performance comparisons Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2023-01-06 Cuiwei Mao, Xiaoyi Gou, Bo Zeng
Purpose This paper aims to overcome the problem that the single structure of the driving term of the grey prediction model is not adapted to the complexity and diversity of the actual modeling objects, which leads to poor modeling results. Design/methodology/approach Firstly, the nonlinear law between the raw data and time point is fully mined by expanding the nonlinear term and the range of order
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Investigating economic replacement policy under uncertainty for managerial application based on grey-reliability approach using QCC Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-12-16 Nan Li, M. Prabhu, Atul Kumar Sahu
Purpose The main purpose of present study is to model the replacement policy under uncertainty for managerial application based on grey-reliability approach by considering the subjective views of quality control circle (QCC). The study objectively links the optimality between individual replacement and group replacement policies for determining the minimum operational costs. The integrated framework
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Casualty scheduling optimisation with facility disruptions under grey information in early stage of post-earthquake relief Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-12-06 Yufeng Zhou, Ying Gong, Xiaoqing Hu, Changshi Liu
Purpose The purpose of this paper is to propose a new casualty scheduling optimisation problem and to effectively treat casualties in the early stage of post-earthquake relief. Design/methodology/approach Different from previous studies, some new characteristics of this stage are considered, such as the grey uncertainty information of casualty numbers, the injury deterioration and the facility disruption
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Nonadditive tourism forecast combination using grey relational analysis Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-12-02 Yi-Chung Hu
Purpose Forecasting tourism demand accurately can help private and public sector formulate strategic planning. Combining forecasting is feasible to improving the forecasting accuracy. This paper aims to apply multiple attribute decision-making (MADM) methods to develop new combination forecasting methods. Design/methodology/approach Grey relational analysis (GRA) is applied to assess weights for individual
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One ranking method of interval grey number based on generalised greyness Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-11-15 Xican Li, Li Li
Purpose In order to reflect the essential characteristics of interval grey number and study the ranking method of interval grey number as a whole, this paper aims to establish a ranking method of interval grey number. Design/methodology/approach First, based on the generalised greyness of interval grey number, the definitions of referenced grey number and proximity degree are given. Second, based on
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Advance in grey system theory and applications in science and engineering Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-11-10 Sifeng Liu, Yong Tao, Naiming Xie, Liangyan Tao, Mingli Hu
Purpose The purpose of this paper is to summarize the advances in grey system theory research and various application achievements in science and engineering. At the same time, it commemorates the 40th anniversary of the birth of grey system theory and the 10th anniversary of Grey Systems–Theory and Application. Design/methodology/approach Firstly, the innovations of theoretical research in grey system
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Grey system theory in engineering: a bibliometrics and visualization analysis Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-11-03 Liangyan Tao, Ailin Liang, Naiming Xie, Sifeng Liu
Purpose The year 2022 marks the 40th anniversary of the establishment of the grey system theory (GST), which has been widely applied in the engineering field. This paper aims to systematically identify the achievements, hotspots, knowledge structure and emerging trends in this field. Design/methodology/approach A bibliometrics analysis was conducted on relevant publications retrieved from Web of Science
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Purchase decision making of garage equipment using an integrated fuzzy AHP and grey relation analysis method Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-10-31 Ajith Tom James, Mohammad Asjad, Rahul Panchal
Purpose Automobile maintenance garages require varieties of equipment for their smooth functioning. However, the purchase of the right equipment from alternatives is a tough task as it depends on several economic, technical, and environmental considerations, etc. Moreover, there are different sellers for such equipment, whose features would be satisfying the purchase criteria in varying levels or degrees
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A summary of grey forecasting models Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-10-25 Naiming Xie
Purpose The purpose of this paper is to summarize progress of grey forecasting modelling, explain mechanism of grey forecasting modelling and classify exist grey forecasting models. Design/methodology/approach General modelling process and mechanism of grey forecasting modelling is summarized and classification of grey forecasting models is done according to their differential equation structure. Grey
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On general uncertainty data and general uncertainty variable for reliability growth analysis of major aerospace equipment Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-09-21 Sifeng Liu, Wei Tang
Purpose The purpose of this paper is to explore new ways and lay a solid foundation to solve the problem of reliability growth analysis of major aerospace equipment with various uncertainty data through propose new concepts of general uncertainty data (GUD) and general uncertainty variable (GUV) and build the operation system of GUVs. Design/methodology/approach The characteristics of reliability growth
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A novel consensus reaching method for MCGDM in social network with intuitionistic grey linguistic numbers Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-09-07 Sandang Guo, Qian Li, Yaqian Jing
Purpose The existing consensus reaching mechanisms ignore the influence of social triangle structure on the decision-makers’ (DMs') weights, and the consensus reaching process (CRP) fails to fully reflect the DMs' subjectivity and can be time consuming and costly. To solve these issues, a novel CRP for multi-criteria group decision-making (MCGDM) problems with intuitionistic grey linguistic numbers
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Grey system theory in sustainable development research—a literature review (2011−2021) Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-08-24 Mingli Hu, Wenjie Liu
Purpose As the grey systems theory has been widely used in the field of sustainable development (SD) research, in the following, a short literature overview will be put forward, starting from the usage of these theories in the economic development, social inclusion and environmental protection contributions to the evolving process of SD during 2011–2021. The purpose of this paper is to identify some
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Application progress of grey model technology in agricultural science Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-08-09 Bingjun Li, Shuhua Zhang, Wenyan Li, Yifan Zhang
Purpose Grey modeling technique is an important element of grey system theory, and academic articles applied to agricultural science research have been published since 1985, proving the broad applicability and effectiveness of the technique from different aspects and providing a new means to solve agricultural science problems. The analysis of the connotation and trend of the application of grey modeling
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The method and its applications of determining possibility function of grey set Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-08-02 Li Li, Xican Li
Purpose Grey set is the important foundation of the grey mathematics and grey system theory, and the possibility function is the way of expressing grey set. This paper aims to establish the method of determining the possibility function of grey set and discusses its extended applications. Design/methodology/approach First, the grey kernel and the grey support set of grey set are defined, and the properties
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Study on the symbiotic development path of traditional villages in the county based on the grey relation analysis: the case of Xunxian County in Henan, China Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-07-25 Changzheng Gao, Juepin Hou, Jian Gong
Purpose Abundance of cultural resources is a typical feature of traditional villages. It is particularly important to explore the development path of traditional villages from the perspective of cultural resources. Design/methodology/approach Based on symbiosis theory, establish a symbiotic development mechanism of traditional village characteristic cultural elements and use grey relation analysis
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Constructing interval models using neural networks with non-additive combinations of grey prediction models in tourism demand Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-07-11 Peng Jiang, Yi-Chung Hu
Purpose In contrast to point forecasts, interval forecasts provide information on future variability. This research thus aimed to develop interval prediction models by addressing two significant issues: (1) a simple average with an additive property is commonly used to derive combined forecasts, but this unreasonably ignores the interaction among sequences used as sources of information, and (2) the
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Electric supply and demand forecasting using seasonal grey model based on PSO-SVR Grey Syst. Theory Appl. (IF 2.9) Pub Date : 2022-07-05 Xianting Yao, Shuhua Mao
Purpose Given the effects of natural and social factors, data on both the supply and demand sides of electricity will produce obvious seasonal fluctuations. The purpose of this article is to propose a new dynamic seasonal grey model based on PSO-SVR to forecast the production and consumption of electric energy. Design/methodology/approach In the model design, firstly, the parameters of the SVR are