Abstract Six Sigma as a quality improvement framework cannot remain static if it is to sustain its value for businesses beyond the first waves of applications. This paper explores possibilities enhancing usefulness and effectiveness by integration established Operations Research/Management Science (OR/MS) techniques. In this paper, we elucidate needs OR/MS techniques enhance deployment in operational transactional environments propose new training roadmap core professionals (Six Black Belts)...

Power intermittency and maintenance cost are the major challenges in harvesting wind energy. This paper proposes a multicriteria optimization model to design operate wind-based distributed generation (DG) system. The goal is determine equipment sizing, siting, schedules so that system minimized while turbine reliability maximized. System comprises initial capital, operations, maintenance, downtime losses, environmental penalty. study makes an early attempt incorporate policy of generating...

Control charts for monitoring the time between events can be applied in various areas. In this study, we focus on exponential control chart and consider phase II problem (when process parameters are known) as well I unknown). An designed with conventional approach has disadvantage that Average Run Length (ARL) value may increase when deviates from nominal state. ARL-unbiased design is therefore proposed both charts. A sequential sampling scheme adopted chart. The several advantages over one,...

Production, yield and maintenance are three key components for sustaining the competitiveness of a manufacturing firm. In this paper, we investigate joint production planning problem in periodic review environment subject to stochastic demand random yields. The system deteriorates from period according discrete-time Markov chain. objective is find an integrated lot sizing policy such that aggregate cost associated with production, holding, backlogging minimised. We formulate as decision...

The cumulative count of conforming (CCC) chart as a main statistical process control tool for monitoring high-quality processes has been widely studied. However, its applicability is limited to situations where units product are inspected sequentially, or item by item. Motivated real-life problems, this paper proposes an improved charting technique under group inspection. It integrates self-starting feature and approximately ARL- (average run length) unbiased design. chart, named the CCCG...

This study concerns the reliability assessment in high-quality new product development which there is scarcity of data resulting from few or zero failures unavailability failure time information. In such circumstances, traditional methods tend to be inadequate and ineffective. paper describes a pragmatic approach adopted address this practical issue. A Bayesian method using reparameterization Weibull distribution proposed, elicits priors meaningful way technical experts based on historical...

ABSTRACT There are many real-life situations where exact failure times not available or easily for reliability analysis. Motivated by this problem, work is concerned with the analysis of data without times. The unavailability has compelled us to develop a simplified version maximum likelihood (ML) estimation parameters and measures. approach applicable single-parameter models including exponential model Weibull an assumed known shape parameter value. In latter case, it takes advantage fact...

This research arose from a challenge faced in real practice—monitoring changes to the Weibull shape parameter. From first-hand experience, we understand that mechanism for such purpose is very useful. article primarily focused on monitoring parameter of renewal process. We derive novel statistic making use maximum likelihood theory, which demonstrated follow an approximately normal distribution. desirable normality property makes well suited It also allows simple approach constructing...

A novel trapezoidal slot patch antenna with an embedded strip is proposed for satisfying wireless local area network (WLAN) and worldwide interpretability microwave access (WiMAX) applications simultaneously. The consists of a rectangular radiation etched on the top beveled ground bottom side. By carefully selecting width length ground, can generate two separate bands. measured results show that 10dB return loss bandwidths are 430MHz (2.30{2.73GHz) 3460MHz (3.21{6.67GHz), which cover both...

In supply chain management, it is conventional for the customer to use quality contracts and punishment control its supplier's opportunistic behavior ensure quality. However, this mechanism reactive effects are hardly satisfactory. study, we interested in introducing a new into management - information transparency. A principal-agent model formulated investigate impacts of sampling inspection transparency on management. It shown that combined two mechanisms can significantly improve...