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Components are often subject to multiple competing degradation processes. For multicomponent systems, the degradation dependence within one component or/and among components need to be considered. Physics-based models and multistate models are often used for component degradation processes, particularly when statistical data are limited. In this paper, we treat dependence between degradation processes...
Unique highly reliable components are typical for aerospace industry. For such components, due to their high reliability and uniqueness, we do not have enough empirical data to make statistically reliable estimates about their failure rate. To overcome this limitation, the empirical data is usually supplemented with expert estimates for the failure rate. The problem is that experts tend to be - especially...
According to the data collected from 23 NC machine tools from one type, based on the fuzzy FMEA model, a Failure modes Analysis have been carried out. Fuzzy linguistic variables were introduced into the analysis, and the three risk factors were given different weights, Each FRPNs of the failure modes were calculated by linear programming, and then the failure mode which influence the NC lathe the...
Construction cranes as major lifting equipments are widely used in infrastructure construction projects. With the number of manufacturers increasing and the series of products becoming more and more complete, the evaluation of their overall performances is becoming a focus point. Moreover, the comprehensive evaluation of the construction crane is a multi-level, multi-factor decision-making process...
Reliability of the Fuzzy Association Rules (FARs) extraction is a challenging research in knowledge discovery and data mining. Reliability refers to the trade-off between the prediction accuracy and the rules diversity. In this paper, an approach called Diverse Fuzzy Rule Base (DFRB) is proposed to extract the FARs which are used later to predict the future values. This approach also aims to ensure...
The adaptive resonance theory (ART) can generate and grow the recognition categories based on the similarity between inputs and memories. This paper proposes a new learning system using hierarchical fuzzy ART for two-player games. The proposed system segments an input state space into subspaces by the fuzzy ARTs added hierarchically in proportion as the learning progress of players, and then learns...
Speaker identification in real environment is a key issue in biometrics technology for human computer interaction. In this paper, we propose a fuzzy membership function for adaptive threshold in different modalities reliability measure for robust bimodal speaker identification. In the bimodal speaker identification system, we will also propose an extension of a modified convection reliability function...
The paper makes the model of multilevel fuzzy optimization into location decision on distribution center of emergency logistics for emergency event, and uses information entropy and analytical hierarchy process to determine the combined weight of the indexes, which provides a new way for location decision on distribution center of emergency logistics. Finally, an example is used to validate the feasibility...
To the question of multi-attribute decision making in threat assessment (TA), for improving the reliability of TA and enhancing the quality of assessment, an intuitionistic fuzzy preference information based TA approach on multi-attribute decision making is proposed. Firstly, built the intuitionistic fuzzy interzone judgement matrix; secondly, gived the normalization method for target attributes with...
Evaluation of service quality is becoming more important in the field of retailers, as in other fields. This pilot study is a preliminary attempt to develop an evaluation model by using exploratory factor analysis (EFA), analytic hierarchy process (AHP) and fuzzy comprehensive appraisal (FCA). And then it addresses issues associated with determining the service quality in a retail store environment...
Reliability is an important index to evaluate product quality, and reliability degree is most commonly investigated among various reliability characteristic values. When generalized stress and generalized strength are fuzzy variables, this paper proposes a method for solution based on two algorithms, i.e. the computation of fuzzy reliability using fuzzy number subtraction and fuzzy failure degrees...
Trust is a fundamental concern in large-scale open distributed systems such as multi-agent systems. It lies at the core of all interactions between the entities that have to operate in such uncertain and constantly changing environments. In this paper, an approach is developed for the evaluation of trust using fuzzy reasoning. The approach takes different trust sources into account, thereby minimizing...
With considering lightening and safety of strength, integrations of both distributionpsilas density and functionpsilas density, the normal fuzzy reliability formulas about robot parts that forces are normal distribution, strengths are Weibull distribution and subordinate is gamma function was gotten; first integral change was achieved according to initial data and function imported and extent of integrated,...
With considering lightening and safety of strength, integrations of both distributionpsilas density and functionpsilas density, the fuzzy reliability formulas about machine parts that forces are normal distribution, strengths are gamma distribution and subordinate is parabola of exponential k was gotten; First integral change was achieved according to initial data and function imported and extent...
Aiming at the difficulty in selecting the maintenance mode for power plant equipment with ration, the fuzzy comprehensive evaluation method based on entropy weight and analytic hierarchy process (AHP) is suggested. It combines entropy weight with AHP for against the casualness and subjectivity in traditional method. With the method, the mode is divided into some layers composed of index factors, and...
With considering lightening and safety, integrations of both distributionpsilas density and functionpsilas density, a concept is given about conservative fuzzy reliability design of artificial limb rod. The conservative fuzzy reliability design formulas about artificial limb rod that load, destabilizing critical load, geometry dimension of component etc. are normal distribution and subordinate is...
An assessment model is usually a mathematical model that produces a measuring index, in the form of a numerical score to a situation/object, with respect to the subject of measure. To allow a valid and useful comparison among various situations/objects according to their associated numerical scores to be made, two important properties, i.e., the monotone output property and output resolution properties,...
Aggregation operators are crucial to integrating diverse decision makerspsila opinion. While minimum and maximum can represent optimistic and pessimistic extremes, an ordered weighted aggregation (OWA) operator is able to reflect varied human attitudes lying between the two using distinct weight vectors. Several weight determination techniques ignore characteristics of data being aggregated. In contrary,...
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