This paper proposes a new chart with the generalized likelihood ratio (GLR) test statistics for monitoring the process variance of a normally distributed process. The new chart can be easily designed and constructed and the computation results show that it provides quite a satisfactory performance, including the detection of the decrease in the variance and the individual observation at the sam...

Given a sequence of iid demands and an order up to replenishment policy with negligible lead time, we prove that average fill rate is monotonically decreasing in the number of periods in the planning horizon. This was conjectured to be true in a recent issue of this journal.

Mukherjee and Chakraborti 1 proposed a single distribution-free (nonparametric) Shewhart-type chart based on the Lepage 2 statistic for simultaneously monitoring both the location and the scale parameters of a continuous distribution when both of these parameters are unknown. In the present work, we consider a single distribution-free CUSUM chart, based on the Lepage 2 statistic, referred to as...

Increased competition on the global market forces producers to follow policies leading to finite production runs. This situation requires implementation of a new type of inspection procedures with the aim to improve or sustain production quality levels. One of the most important aspects in the design of inspection processes is the specification of inspection intervals. This paper provides a sim...

A fast, reliable, and objective system for computerized classification of color textured perthite images is proposed. Computerized classification of perthite textures enables large scale comparative perthite texture studies. In order to locate a perthite crystal’s borders, color and texture features are combined in a pixel classification segmentation operation, followed by probabilistic relaxat...

We provide comments on a research paper proposing control chart to monitor the scale parameter of Rayleigh distribution. Our primary focus is improving its average run length profile. determine limits such that, average, one can detect any change in this more quickly than trigger false alarm.

The performance of attributes control charts (such as c and np charts) is usually evaluated under the assumption of known process parameters (i.e., the nominal proportion of nonconforming units or the nominal number of nonconformities). However, in practice, these process parameters are rarely known and have to be estimated from an in-control phase I data set. In this paper, we derive the run l...

The capacity C(3) 0;1 of a 3-dimensional (0; 1) run length constrained channel is shown to satisfy 0:522501741838 C(3) 0;1 0:526880847825 . The authors are with the Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla CA 92093-0407. Email: fnagy,[email protected] . The research was supported in part by the National Science Foundation.

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