Remaining useful life (RUL) prediction of equipment has important significance for guaranteeing production efficiency, reducing maintenance cost, and improving plant safety. This paper proposes a novel method based on an new particle filter (PF) for predicting equipment RUL. Genetic algorithm (GA) is employed to improve the particle leanness problem that arises in traditional PF algorithms, and...

In the autoregressive process of first order AR(1), a homogeneous correlated time series ut is recursively constructed as ut = q ut−1 + σ t, using random Gaussian deviates t and fixed values for the correlation coefficient q and for the noise amplitude σ. To model temporally heterogeneous time series, the coefficients qt and σt can be regarded as time-dependent variables by themselves, leading ...

Recently the optimal reinsurance strategy concerning the insurer’s risk attitude and the reinsurance premium principle is an interesting topic. This paper discusses the optimal reinsurance problem with the insurer’s risk measured by distortion risk measure and the reinsurance premium calculated by a general principle including expected premium principle and Wang’s premium principle as its speci...

South Korea is one of the largest beef importing countries in the world. Australia, USA, and New Zealand provide the majority of beef they import. The objective of this study is to evaluate the price relationship of Korean cattle and corn, prices of the imported beef and corn, and prices of Korean cattle and imported beef. We examine threshold points using threshold vector autoregressive (TVAR)...

هدف: پژوهش حاضر با هدف تحلیل رابطه بین مهارت‌های رهبری پایدار و مؤلفه‌های هم‌­آفرینی نقش میانجی اعتماد شناختی از دیدگاه اعضای هیأت علمی دانشگاه بیرجند انجام گرفت.طراحی/روش­‌شناسی/رویکرد: روش توصیفی- همبستگی بود. جامعه آماری شامل کلیه در سال تحصیلی 98-99 به تعداد 323 نفر بودند که استفاده نمونه­‌گیری تصادفی ساده 230 انتخاب شدند. برای سنجش متغیرهای پرسش­نامه محقق‌­ساخته پایایی 93/0، پرسشنامه هم­‌آ...