We present results on the use of neural network based autoassociators which act as novelty or anomaly detectors to detect imminent motor failures. The autoassociator is trained to reconstruct spectra obtained from the healthy motor. In laboratory tests, we have demonstrated that the trained autoassociator has a small reconstruction error on measurements recorded from healthy motors but a larger...

Identification of faulty variables is an important component of multivariate statistical process monitoring (MSPM); it provides crucial information for further analysis of the root cause of the detected fault. The main challenge is the large number of combinations of process variables under consideration, usually resulting in a combinatorial optimization problem. This paper develops a generic r...

Modern cluster file systems such as PVFS that stripe files across multiple nodes have shown to provide high aggregate I/O bandwidth but are prone to data loss since the failure of a single disk or server affects the whole file system. To address this problem a number of distributed data redundancy schemes have been proposed that represent different trade-offs between performance, storage effici...

this paper presents a new observer design methodology for a time varying actuator fault estimation. a new linear matrix inequality (lmi) design algorithm is developed to tackle the limitations (e.g. equality constraint and robustness problems) of the well known so called fast adaptive fault estimation observer (fafe). the fafe is capable of estimating a wide range of time-varying actuator fault...

the idea of this paper is designing an automatic fault detection system based on fuzzy logic, therefore two signals of pmsm in fault condition are analyzed for inter turn fault detection: current and torque. in this fault type there is some distortion in these signals, but it is not good enough to detecting with fuzzy logic solely, so with combination of wavelet transform and fcm a new method f...

This paper presents an approach to the fault diagnosis and disturbance observation for the hydraulic vertical three-tank system. An observer is designed which contains a corrective term based on a second-order sliding mode control algorithm featuring global convergence properties. Thanks to the proposed global observer, the reconstruction of certain faults and/or disturbances can be performed d...

XXX XXX XX XXX. In this paper we propose a novel approach for safety analysis based on system interface models, which are shared for both system and safety engineering. By extending interaction models on the system interface level with failure modes as well as relevant portions of the physical system to be controlled, automated support can be provided for much of the failure analysis. We partic...

The proposed method is an ((r1, ... , rk) , n)-threshold sharing system: n shares are created by the sharing system to replace the index file of a given quantized image. Security is achieved through the fact that interceptors cannot view the image if they intercept less than r1 shares. Fault-tolerance is also obtained because the VQ version of the image can be fully recovered using any rk share...

BACKGROUND Post-mastectomy breast reconstruction is commonly performed in the United States with numerous options available to patients and providers. This study evaluated patient race and provider in prediction of patient satisfaction following post-mastectomy breast reconstruction. METHODS The patient satisfaction for women who underwent post mastectomy breast reconstruction at U...