Efektivitas Kinerja Diagram Kontrol G

Abstract

AbstrakStatistical Proses Control (SPC) merupakan metode dalam ilmu statistika yang bertujuan untuk mengontrol suatu proses. Dalam mencapai tujuan SPC maka metode yang dapat digunakan adalah Diagram Kontrol (Control Chart). Diagram kontrol merupakan sebuah grafik yang memberi gambaran tentang perilaku sebuah proses. Diagram kontrol dapat dibagi menjadi dua berdasarkan banyaknya karakterisrtik kualitas yang diamati, yaitu diagram kontrol univariat dan diagram kontrol multivariat. Dalam memonitor proses membutuhkan dua hal penting, yaitu memonitor mean proses dan memonitor variabilitas proses [1]. Kinerja dari suatu diagram kontrol dapat dilihat dari seberapa cepat suatu diagram kontrol dapat mengidentifikasi sinyal out of control. Salah satu metode untuk melihat kinerja diagram kontrol adalah Average Run Length (ARL). Noya Van Delsen dan Mashuri dalam [2], membandingkan kinerja diagram kontrol G dan diagram kontrol yang berdasar pada ARL. Namun penelitian tersebut dibatasi pada jumlah karakteristik kualitas yang digunakan. Sehingga penelitian ini bertujuan untuk meninjau kinerja diagram kontrol G yang berdasar pada ARL, dengan jumlah karakteristik kualitas yang bervariasi. Hasil simulasi ARL menunjukkan bahwa kinerja diagram kontrol G sangat efisien walaupun menggunakan jumlah karakteristik karakteristik yang bervariasi. Ini dibuktikan dengan interval nilai ARL yang saling mendekati. AbstractStatistical Proces Control (SPC) is a statistical method that useful for monitoring process. In achieving the goals of the SPC, the method of control chart is used. Control chart is a chart that gives an overview of the behavior of a process. Based on the number of quality characteristics which observed, control chart is divided into univariate control chart and multivariate control chart. In monitoring process, it requires two important things, which are monitoring mean process and variability process [1]. The performance of a control chart can be seen from how fast a control chart can identify the signal out of control. A method to see performance of control chart is called the Average Run Length (ARL). Noya Van Delsen and Mashuri in [2] compared the performance of G control chart with control chart that based on the ARL. But their research is limited to the number of quality characteristic. So this research aims to look at the performance of G control chart with a varied of quality characteristics. The results of ARL show that the performance of G control chart is efficient even only use a varied of quality characteristics. This is proved by interval of ARL values which are approaching each other.

Mental Capacities, Self-reliance and Policy

“…If the system were to offer people more choice and freedom, it would be more likely to create problems than to offer solutions for the vast majority of the Dutch. 9 Greater freedom of choice can increase autonomy in the short term but impair it in the long term, notably if people make the wrong choices and do not accrue enough pension. By the time they are aware that they have made the wrong choices, it is too late to rectify them.…”