黄宗羲经世之学刍议

黄宗羲之学并不是我们理解的经世实学。他追求的是一种整体天理之学,其特征是理气合一、道事合一、知行合一、万物一体。而任何分离理与气、道德与事功、知和行之学皆是伪学、虚学。单纯的经世之学也是这种分离的产物,黄宗羲对之持明显的批判态度。     

Comparison of Support Vector Machines to Other Classifiers Using Gene Expression Data

The efficiency of independent controling variates in simulation of activity networks will be evaluated in the sense of mean square deviation of the estimator from the true value. The given result is asymptotic     

Optimal preventive policies for imperfect maintenance models with replacement first and last

ABSTRACT

This paper proposes preventive replacement policies for an operating system which may continuously works for N jobs with random working times and is imperfectly maintained upon failure. As a failure occurs, the system suffers one of the two types of failures based on some random mechanism: type-I (repairable or minor) failure is rectified by a minimal repair, or type-II (non repairable or catastrophic) failure is removed by a corrective replacement. A notation of preventive replacement last model is considered in which the system is replaced before any type-II failure at an operating time T or at number N of working times, whichever occurs last. Comparisons between such a preventive replacement last and the conventional replacement first are discussed in detail. For each model, the optimal schedule of preventive replacement that minimizes the mean cost rate is presented theoretically and determined numerically. Because the framework and analysis are general, the proposed models extend several existing results.     

Preliminary test almost unbiased two-parameter estimators with student’s t errors and conflicting test statistics

Abstract

In this paper, we consider the preliminary test approach to the estimation of the regression parameter in a multiple regression model under multicollinearity situation. The preliminary test almost unbiased two-parameter estimators based on the Wald, the Likelihood ratio, and the Lagrangian multiplier tests are given, when it is suspected that the regression parameter may be restricted to a subspace and the regression error is distributed with multivariate Student’s t errors. The bias and quadratic risk of the proposed estimators are derived and compared. Furthermore, a Monte Carlo simulation is provided to illustrate some of the theoretical results.     

Percentile bounds and tolerance limits for the birnbaum-saunders distribution

In this paper, a confidence interval for the lOOpth percentile of the Birnbaum-Saunders distribution is constructed. Conservative two-sided tolerance limits are then obtained from the confidence limits. These results are useful for reliability evaluation when using the Birnbaum-Saunders model. A simple scheme for generating Birnbaum-Saunders random variates is derived. This is used for a simulation study on investigating the effectiveness of the proposed confidence interval in terms of its coverage probability.     

On the asymptotic distribution of an isotonic window estimator for the generalized failure rate function

Barlow and van Zwet (1969, 1970, 1971) have proposed the isotonic window estimators for the generalized failure rate function and established some asymptotic properties. In this paper, we provide a proof, together with a set of sufficient conditions, of the asymptotic normality of an isotonic window estimator.     

Factors influencing the slip index measurements with the Horizontal Pull Slipmeter

Several factors that might influence the outcomes of the slip index measurements with the Horizontal Pull Slipmeter were examined. These factors were either those not clearly specified in the operating guidelines of the device or those clearly specified but with a high variability in operator compliance. The results indicated that the shoe pad thickness, sanding, alignment between the string and the force gauge, and temperature were the factors that led to significant differences at the levels evaluated. The differences due to string stiffness, string length, duration from cleaning to friction measurement, dwell time, battery level and relative humidity did not reach a statistically significant level. Extra guidelines are needed for those factors that could result in significant variations in order to lead to more consistent results.     

Coping and Post-traumatic Stress after Hurricanes Katrina and Rita: Racial Disparities in Social Work Student-Practitioners

ABSTRACT

Recent hurricanes have focused on lives and properties lost, however, additional mental health concerns may emerge in these post-disaster settings. Post-traumatic stress symptoms (PTSS) are particularly problematic for minorities due to pre-disaster disparities. Scholars must thus examine the antecedents of PTSS to support these and other vulnerable individuals and communities. This study examined racial disparities regarding active and avoidant coping, prayer, and subsequent relative contribution of each to PTSS following Hurricanes Katrina and Rita among social work student-practitioners. Using secondary data, results revealed that minority students (n = 233) used coping via prayer more often than their non-minority peers (n = 124; t = 7.18, p < .000; d = 0.76). Moderate, positive relationships emerged between avoidant coping and PTSS for both groups (r = .58–.63, p<.01), though prayer did not emerge as inversely related to PTSS as anticipated. Avoidant coping accounted for the largest variation in PTSS for both groups (β = .35–.51, p<.001). Sampling, survey methods, and PTSS measures limit generalizability and temper findings. Directions for future research include use of PTSS measures that account for severity and cultural context and examination of coping measure psychometrics. Practice implications include enhanced publicity regarding social services available to student-practitioners on college campuses and within the community.