Online fault detection system for circular knitting machines [Yuvarlak örme makineleri için on-line hata kontrol sistemi]

Due to the design of the circular knitting machines, it is not possible to see the faults on the fabric as soon as they occur. Faults become only as seen after some piece of, around 50 to 60 cm long, fabric is knitted. This situation causes loss of time and material for the manufacturers. In this article, a system that detects the faults that may occur during the production on circular knitting machines and automatically power off the machine upon detection of any fault is introduced. The developed on-line fault detection system combines and implements several state of the art methods available in the literature and in the industry. The system is a product of a multi-disciplinary study, including textile engineering, signal and image processing, electrical engineering

Comparison of OBS protocols

In this paper, we give an overview of all-optical networks. The classification of Optical Burst Switched Networks (OBS) which is one of the WDM schemes is proposed. We compare the performance of different traffic models on definite signaling protocols of OBS. These traffic models are IP/Burst and Multimedia traffic. As Multimedia traffic we evaluate the performance of video traffic through all-optical network. We also investigate the affects of other traffics and network characteristics on aplication performance. The examined signaling protocols are JIT, JET and Horizon. We apply the exponential and hyperexponential distributions on these traffics for producing the inter-arrival times of the packets. We present a communication between a source client node and a destination client node over an ingress and one or more multiple intermediate switches. Our paper also includes burst setup, burst setup ack and keepalive message types. We propose a framework for calculating the droping rates. As a result, we compare the signaling protocols according to the burst drop rates

Just-in-time, just-enough-time and horizon signalling protocols on optical burst switches

Optical burst switch (OBS) is considered to be a promising switch technology for the future network. In this paper, just-in-time (JIT), just-enough-time (JET) and horizon signalling schemes for OBS are presented. These signalling schemes run over a core dynamic wavelength division multiplexing (DWDM) network. The network is proposed to support IP, ATM and burst traffic. We apply the Poisson and self-similar models to identify inter-arrival times in these protocols and the burst contention is handled by burst dropping. As a result, the variety of the simulation results show the pros and cons of the evaluated JIT, JET and horizon signalling schemas