This paper proposes a new strategy at the system level to evaluate and mitigate power system cascading outages adaptability considering protection system hidden failure. An explicit probability model of protection system hidden failures is established to demonstrate its effects on power system adaptability. The event tree is used to analyse the cascading outages sequences. Some adaptability ind...

Digital watermarking technique has been presented to solve copyright protection, copy protection, and content authentication issues in the digital world. Conventional watermarking algorithms are mostly designed for only one purpose. In recent years, some multipurpose digital watermarking methods based on discrete wavelet transform (DWT) and discrete Fourier transform (DFT) have been presented t...

From the angel of environment protection, through analysing the properties of three majority types of sizing agent, such as starch(modified starch), PVA(polyvinyl alcohol) and acrylic size, we attempted to compare the sizing performance indices of several different environment protection sizing agents. We also briefly introduced several printing pastes with research values currently which could...

Power systems should have acceptable reliability in order to operate properly. Highly available and dependable protective relays help to obtain the desirable reliability. The relays should be periodically evaluated during specific intervals to achieve the mentioned characteristics. The Routine Test Interval (RTI) should be optimized in order to economically maximize the reliability of the prote...

The data from our 1968-69 influenza vaccine field trials are anlaysed and pre-challenge haemagglutinin and neuraminidase serum antibodies are evaluated as indices of protection. Prevention of flu-like disease, fever, confinement to bed, and/or seroconversion to Hong Kong was significantly related to post-vaccine A/Hong Kong/68(H3N2) haemagglutination-inhibition (HI) titres. Prevention of diseas...

Appropriate operation of protection system is one of the effective factors to have a desirable reliability in power systems, which vitally needs routine test of protection system. Precise determination of optimum routine test time interval (ORTTI) plays a vital role in predicting the maintenance costs of protection system. In the most previous studies, ORTTI has been determined while remote bac...

Applying vector quantization (VQ) to an image delivers an index map. Dividing this index map into blocks results in each block using a limited number of codeword indices of the whole codebook (CB) while the rest of indices are unused. The proposed method exploits the unused indices to embed the watermark bits. The proposed watermark gives a high peak signal to noise ratio (PSNR) while keeping b...