The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Accompany with the growth of the speed in network, people's living standard has greatly improved, but the threaten to its information's security has also appeared, as a important branch of information security, steganography is a useful method to protect the secret information safety. In view of the high complexity of current video steganographic algorithms, and combining with the trailing coefficient...
On the basis of analyzing some existing video steganographic algorithms and find out some problems, like have large impact on the video quality and bit rate, so we propose a new algorithm based on grey relational analysis combining with the partition modes features of the H.264/AVC. The algorithm firstly compute the grey relevancy of blocks and judge if it has texture features. Then perform DCT on...
Research on target's bistatic radar cross section (RCS) is attracting more and more attention nowadays. As the most widely used calibration object, understanding sphere's scattering characteristic will make sense in bistatic RCS measurement. In this paper, the bistatic scattering mechanism is analysed first. On this basis, we discuss sphere's scattering characteristic in both frequency and bistatic...
The reflector panel is an essential equipment to form a quasi plane wave in the compact range. At present, there are many studies about the design of compact range reflector panel at home, but what's unfortunate is that it is rare for reflector panel designing with processing and manufacturing. This article mainly analyses the principle of design and manufacturing process of each part of compact range...
Return-Address Stack (RAS) has been widely used in modern high-performance microprocessor to predict the return address of a routine. But speculative execution frequently corrupts the RAS, making repair mechanisms necessary. In this paper, based on analysis of RAS activities after misprediction and current RAS repair mechanisms, an effective return address prediction structure called Self-Aligning...
This paper investigates the power control problem for parallel amplify-and-forward OFDM relaying networks under hybrid power constraints across relays. Based on the concavity of the objective function, an iterative algorithm, which definitely converges to the optimal solution, is firstly proposed for the special case where the aggregate constraint could be ignored. Then, for the general case where...
We investigate the power allocation problem for dual-hop parallel OFDM relaying networks where an aggregate power constraint is imposed on all of the amplify-and-forward relays. Based on Y. Zhao et al's recent work, we first formulate the problem to how to optimally allocate the total power among all subcarriers such that the system instantaneous information rate is maximized, then we decompose it...
The present study shows that the debt-to-asset ratio of China's state-owned enterprises and of China's industrial enterprises basically hold constant in recent years after reaching a peak in 1995. The correlation between the debt ratio of China's state-owned enterprises and GDP growth rate is small, yet the correlation between the debt ratio of China's state-owned enterprises and inflation rate is...
In this paper, we investigate the power allocation optimization problem for dual-hop nonregenerative OFDM relaying networks, where an aggregate power constraint is imposed on all relays. We first formulate the model into a single-parameter optimization problem, in which we found the related functions are monotonically decreasing. Then based on the monotonicity, we propose a bisection algorithm to...
The paper establishes an indicator and model system aiming at predicting macroeconomic risks for a nation. The main characters of the system lie in the several aspects: it focuses on national macroeconomic risks rather than complex risks or the risks for some special business or department; it selects only the indicators which possess the most important influences directly on the macro-economy and...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.