In Japan, many infrastructures are several decades old or more, and since those structures are gradually deteriorating, efficient and precise monitoring methods are strongly required for maintaining safety. In particular, tunnels on highways must be monitored regularly; however, frequent traffic restrictions should be avoided. Accordingly, visual inspection of tunnels from a moving vehicle is a...

Kele Xu, Xi Liu, Chang Liu, Hengxing Cai, Zhifeng Gao Pierre and Marie Curie University, 75005 Paris, France ESPCI Paris, PSL Research University, CNRS, 1 rue Jussieu, Paris, 75005, France College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China Department of Spine Surgery, Third Affiliated Hospital, Sun Yat-Sen University, Guangzhou, 5106...

The manufacturing of critical applications often requires a low or zero defect level. To ensure quality is not compromised when high product reliability is required, quality-engineering departments frequently employ 100% inspection. Given the fallibility of human inspectors though, re-inspection procedures, at times, may have to be implemented. This paper analyzes various multi-inspector scenar...

Quality inspection is an indispensable part of modern industrial manufacturing. Steel as a major industry requires constant surveillance and supervision through its various stages of production. Continuous casting is a critical step in the steel manufacturing process in which molten steel is solidified into a semi-finished product called slab. Once the slab is released from the casting unit, th...

In this work, a method using transmission interferometry is proposed to detect micro defects (streaks, inclusions, air bubbles, grooves, cracks, etc.) present in transparent materials surface. This technique non-destructive and non-contact for the analysis of optical components whose surfaces vary from few mm2 larger sizes. The purpose provide means as simple possible identify with low contrast...

This study examines an imperfect production and inspection system with customer return and defective disposal. We develop an optimal lot sizing model with production and inspection quality investment, incorporating all the quality costs. We find the optimal lot size, rework frequency, defective proportion, and Type I and Type II inspection error proportions which minimize the total quality cost...