A solid state relay (SSR) is an electrical ON-OFF control device through which the delivery of electrical power to loads is switched either ON or OFF by a small control signal. The device serves the same function as a classical electromechanical relay (EMR) but carries no mechanical switching...

Through listening to the voice of the customer, quality function deployment (QFD) is a systematic methodology for quality improvement and product development. The quality of a product or service is ultimately judged in terms of customer satisfaction. Customer satisfaction benchmarking can help...

Under rapidly changing and highly competitive circumstances, the timely design, development and marketing of new products or services with creative and innovative features are essential for a company’s survival. In order to capture and retain market share, customer requirements and...

Abstract Control charts for high quality processes based on counting cumulative conforming items have attracted a lot of attention recently. However, such charting procedures usually apply when items are inspected one by one. There are situations that products are inspected sample by sample for...

To achieve quality in customer service is to enhance a company’s competitiveness. With the birth of the World Wide Web, the process of making products and services available to customers has changed from traditional communication channels to Web‐based information systems. Consequently, the...