Short run spc based upon the second order dynamic linear model for trend detection

Recently, several new applications of control chart procedures for short production runs have been introduced. Bothe (1989) and Burr (1989) proposed the use of control chart statistics which are obtained by scaling the quality characteristic by target values or process estimates of a location and scale parameter. The performance of these control charts can be significantly affected by the use of incorrect scaling parameters, resulting in either an excessive "false alarm rate," or insensitivity to the detection of moderate shifts in the process. To correct for these deficiencies, Quesenberry (1990, 1991) has developed the Q-Chart which is formed from running process estimates of the sample mean and variance. For the case where both the process mean and variance are unknown, the Q-chaxt statistic is formed from the standard inverse Z-transformation of a t-statistic. Q-charts do not perform correctly, however, in the presence of special cause disturbances at process startup. This has recently been supported by results published by Del Castillo and Montgomery (1992), who recommend the use of an alternative control chart procedure which is based upon a first-order adaptive Kalman filter model Consistent with the recommendations by Castillo and Montgomery, we propose an alternative short run control chart procedure which is based upon the second order dynamic linear model (DLM). The control chart is shown to be useful for the early detection of unwanted process trends. Model and control chart parameters are updated sequentially in a Bayesian estimation framework, providing the greatest degree of flexibility in the level of prior information which is incorporated into the model. The result is a weighted moving average control chart statistic which can be used to provide running estimates of process capability. The average run length performance of the control chart is compared to the optimal performance of the exponentially weighted moving average (EWMA) chart, as reported by Gan (1991). Using a simulation approach, the second order DLM control chart is shown to provide better overall performance than the EWMA for short production run applications     

Sexual Function in Women with Deep Endometriosis: Correlation with Quality of Life,Intensity of Pain,Depression, Anxiety,and Body Image

Objectives: We evaluated sexual function, quality of life and perceived body image of women with deep endometriosis in comparison to that of healthy women. Methods: The sample consisted of 41 women with deep endometriosis and 40 healthy women without endometriosis. Sexual, psychological and pain evaluation were performed. Results: The study evidenced that deep endometriosis has a significant impact on sexuality and body image. Conclusions: An integrated and patient-centered approach to medical and psychological and sexual issues is suggested.     

Cross‐Cultural Validity of Bowen Theory in Southern European Countries

We present a comparison between Italy, Spain, Greece, and Portugal to test the cross‐cultural validity of the Differentiation of Self Inventory Revised (DSI‐R) Scales of emotional cut‐off (EC) and emotional reactivity (ER). Our study focuses on the importance of in‐depth analyses of the differentiation of self‐constructs from a cross‐cultural perspective and reflects on the possibility of conceptualising the universality of Bowen theory in southern European countries. The study involved 1,807 healthy individuals. All participants completed the DSI‐R (Skowron & Schmitt, 2003). It was found that the measurement models had a suitable fit for each country group. Nevertheless, in our study, the two DSI‐R subscales, ER and EC, highlighted a weak invariance, specifically demonstrating only the invariance of the pattern factor loadings and the magnitude of factor loadings in the four samples. The empirical and clinical implications of these data are discussed.     

Influence of water quality and habitat conditions on amphibian community metrics in rivers affected by urban activity

Urban Ecosystems - Anuran amphibians are highly dependent on aquatic ecosystems. Many amphibian species are exhibiting population declines primarily due to habitat destruction and water quality...     

Chinese Indonesians: how many,who and where?

This paper provides new statistics to the debate on percentage of Chinese Indonesians, using the latest 100% data set of the 2010 population census. It reveals that the statistics is closer to the low side of the debate, less than 2.0%, rather than the high side of 3.0% and more. Ethnicity is here self-defined by the respondents. With 1.2%, the Chinese Indonesians ranked as the 15th largest group of more than 600 ethnic groups. This paper also produces statistics at the district level, the first ever statistics on Chinese Indonesians. It finds that some provinces and districts have large percentages of Chinese Indonesians, but the respective total population are relatively small to the total Indonesia’s population. Majority of provinces and districts (25 out of 33 provinces and 415 out of 497 districts) have lower percentage of Chinese than the national figure.     

A production model for deteriorating items with stochastic preventive maintenance time and rework process with FIFO rule

Due to unreliable production facility and stochastic preventive maintenance, deriving an optimal production inventory decision in practice is very complicated. In this paper, we develop a production model for deteriorating items with stochastic preventive maintenance time and rework using the first in first out (FIFO) rule. From our literature search, no study has been done on the above problem. The problem is solved using a simple search procedure; this makes it more practical for use by industries. Two case examples using uniform and exponential distribution preventive maintenance time are applied. Examples and sensitivity analysis are conducted for each case. The results show that rework and preventive maintenance time have significant affected the total cost and the optimal production time. This provides helpful managerial insights to help management in making smart decisions.     

Attitudes towards and perception of gambling among secondary school students in a developing country

ABSTRACT

Gambling is common in Nigeria and over the years has gained wide acceptability among the populace. Improved technology and legalization of gambling have led to increased gambling opportunities among young people. The aim of this study is to determine the attitude towards and perception of gambling among a sample of secondary school students in South East Nigeria. A total of 507 male students from three male-only urban Secondary Schools in Owerri, Imo State participated in the study. Multistage sampling technique was used in sample selection. Data was collected using a self-administered socio-demographic questionnaire and the 9 Item Attitude Towards Gambling Scale. Results showed an overall negative perception of gambling. Majority of the respondents (82.8%) perceived gambling as a risky activity while few (27.3%) perceived it as a good way of earning an income quickly. More than half of the respondents (52.7%) believed that gambling yields a high return. There was a significant association between parental gambling and positive attitude towards gambling (X = 6.27, p = 0.04). Thus, preventive strategies targeted towards changing gambling attitudes in parents may serve a dual role of changing attitudes and perception of gambling in their offspring.