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In this paper we introduce a robust image-adaptive data hiding in wavelet domain that hide data in images while imposing minimal perceptual degradation in original image. As it is well accepted, data embedding in the low and mid frequency parts of an image have better robustness under compression attacks than high frequency parts. So our method embeds more data in low frequency coefficients than high...
This paper presents a new approach for hiding message in digital image in spatial domain. In this method two bits of message is embedded in a pixel in a way that not only the least significant bit of pixel is allowed to change but also the second bit plane and fourth bit plane are allowed to be manipulated, But the point is in each embedding process only one alternation in one bit plane is allowed...
In this paper switching overvoltages of an actual transmission line are studied. Simulations are executed using Electro Magnetic Transients Program. A comprehensive switching transient study is performed for the Azerbaijan province network in Iran. The purpose of this study is to determine the unnecessary pre-insertion resistors in the UHV network, since the new policy is to use pre-insertion resistors...
In this paper a novel method of ATP (alternative transients program) simulation for single-pole auto-reclosing is introduced. This paper presents an investigation of single-pole auto-reclosing on HV transmission lines. By simulating real trapped charge, overvoltage profile is monitored. Most of the faults on HV transmission lines are single-pole to ground. In order to have a general overview of single-pole...
In this paper two centralized adaptive under frequency load shedding algorithms are proposed and analyzed. The objective of these methods is to simultaneously protect power systems against frequency instability as well as voltage instability, following combinational disturbances. After some events in power systems frequency starts to recover, while the system collapses due to voltage instability....
In this paper a reliability model for power transformer protection is proposed. The model is an extension of a previously proposed Markov model for transmission line protection. Optimum routine test and self checking intervals of the power transformer protection system are determined using the extended Markov model
In this paper a new adaptive under frequency load shedding algorithm is designed. The purpose of this method is to enhance the adaptability of under frequency relays and increase the security of power system during large disturbances. A suitable method to design the proposed adaptive under frequency load shedding scheme is described in detail. After completing the design, it is tested on a real power...
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