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Dual energy X-ray absorptiometry (DXA) equipment is designed for human and animal research and clinical diagnoses. Controversial impression concerning its use is dictated by various critical appraisals and clinical reports. This study will cross-validate and compare DXA fan beam scannings with direct dissection and computed tomography (CT) scanning data. Twelve porcine carcasses, were measured with...
The increasing variety of products complicates the mixed-model assembly process and affected the assembly system in terms of product quality and productivity. In the paper, variety induced manufacturing complexity with regard to choices that operators have to make for various assembly operations is measured with information entropy of the average randomness in choice processes. The impact of error...
Nowadays, several companies have to apply an appropriate decision-making-method, in order to survive in a high competitive circumstance. The appropriate method is one of the crucial management methods for sustaining a business organization. Since, recently, customers do not only concern about the quality issue, but also environmental concerning has been considerably increased and continually developed...
A novel adaptive Exponentially Weighted Moving Average scheme, called AEWMA3, is suggested for monitoring the stability of a linear relationship between a quality characteristic and an explanatory variable. Comparisons with an analogous non-adaptive scheme points to a better overall performance of the suggested scheme in a variety of out-of-control scenarios. In addition, since a single AEWMA3 chart...
Process capability ultimately decides process quality level. Based on analyzing process capability index (PCI), Process capability may be effectively assured. For the multivariate manufacturing processes, tremendous difficulties are often encountered when one attempts to measure the process capability by directly extending the univariate approach. After analyzing the multivariate Cpm method (Chan...
In the plastics Industry, feed liquid viscosity is always a vital input factor to the quality of final products, but difficult to realize real time measurement. Thus, in this paper, a data-driven soft sensor was developed to help control the viscosities of feed liquid in the production of PVC gloves which contribute a lot to the final quality and rating of gloves on the basis of literature review...
The following topics are dealt with: decision analysis; technology management; knowledge management; supply chain management; production planning; production control; information processing; service innovation; quality control; human factors; manufacturing systems; reliability; maintenance engineering; engineering education; e-business; and e-commerce.
In order to increase a company's competition edge, the main focus of a management strategy is to improve service quality. Indentifying the dimensions of the service quality would definitely help managers in the challenge of improving the service quality. This study is to presents an fuzzy approach to evaluate service quality. Two evaluation indices, optimistic-expectation index (OEI) and pessimistic-expectation...
This paper has been conducted with the aim to focus on hotel service quality based on 29-characteristic indicators applied from SERVQUAL model by comparing two hotel types namely, (1) the boutique hotel and (2) the business hotel in Thailand. This paper also aims to study the expectation, perception and gaps between customers' expectation and perception on hotel services quality. The key findings...
Multivariate quality control charts have some advantages for monitoring more than one variable. Nevertheless, there are some disadvantages when multivariate schemes are employed. The main problem is how to interpret the out-of-control signal. For example, in the case of control charts designed to monitor the mean vector, the chart signals show that there is a shift in the vector, but no indication...
Injection molding is an iterative manufacturing process entailing low operational costs. Quality control plays an important role in this process. To improve the efficiency of quality control measures, we propose a model-free optimization (MFO) method as a replacement for traditional model-based techniques. The simplex search method is incorporated in the MFO, and part weight and dimension are separately...
This article presents a single Statistical Process Control (SPC) chart for simultaneously monitoring the time interval T and magnitude X of an event. The new chart is called a G chart as it deals with a synthetic statistic G. The G chart makes use of the information about the event frequency as well as the information about the event magnitude. Moreover, its detection power can be allocated in an...
Software is currently a key part of many safety-critical applications. But the main problem facing the computer industry is how to develop a software with (ultra) high reliability on time, and assure the quality of software. In the past, some researchers reported that the Pareto distribution (PD) and the Weibull distribution (WD) models can be used for software reliability estimation and fault distribution...
This article presents a FFT method in statistic quality control. Most previous statistic quality control tools can not analysis the quality data in both time and frequency. In this paper, the FFT method is used to transforming our view of the quality signal from time-based to frequency-based, to provide a basis for current decision during production as to when to hunt for cause of variation and take...
Modeling of variation propagation in multistation machining process is one of the most important research fields. In this paper, a mathematic model to depict the part dimensional variation of the complex multistation manufacturing process is formulated. A linear state space dimensional propagation equation is established through kinematics analysis of the relationships among of locating parameter...
In this paper, we consider the monitoring of a multistage process in which the outgoing quality attribute is a reliability-related characteristic. To measure the tensile strength of such quality characteristics, the process output is commonly inspected under limited load conditions. As a result, we may encounter censored observations which demand a certain monitoring procedure. The monitoring scheme...
This article proposes an integrated scheme (T&TCUSUM chart) which combines a Shewhart T chart and a TCUSUM chart (a CUSUM-type T chart) to monitor the time interval T between the occurrences of an event or the time between events (TBE). The performance studies show that the T&TCUSUM chart can effectively improve the overall performance over the entire T shift range. On average, it is more...
Recently, both the non-uniform sampling scheme and economic statistical design approaches have been successfully applied to determine three parameters of X̅ control charts (including sample size, sampling interval between successive samples, and the control limits) for monitoring a manufacturing process with increasing hazard functions. Nevertheless, a primary assumption for these cost models is that...
Assembling is the last phase of producing, which is influential to product quality directly, and estimating the quality of total assembling process is the prerequisite to identify the latent problems and implement quality improvement. In this paper, a quality assurance model of assembling is put forward firstly, then based on the relationship of machining and assembling, the multivariate process capability...
This paper proposes a new cost of quality model that taken into consideration inspections errors, tolerance design and important process quality control techniques in a manufacturing environment. Through simulation works and using a real life data, the model was validated. Results indicate that the model accurately confirms the improvements suggested in the literature.
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