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.
As we all know, the possibility of heavy earthquake is tiny, however, the destructiveness is serious, so it is important to improving the veracity of predicting destructive earthquake. This paper using the database of the destructive earthquake precursor, by defining the small probability even and estimating the parameter of success rate in small probability event prediction and changing the parameter,...
Vehicle traffic congestion has become a serious urban phenomenon in recent years, resulting in a large number of negative effects both on economy and ecology. Thus, finding a way to detect traffic congestion is a highly urgent problem to be solved by scientists and politicians throughout the world. One new promising approach is the usage of vehicular ad-hoc network (VANET). In this paper, we study...
In this paper, we propose a channel-hopping MAC protocol called dynamic hopping MAC (DH-MAC) to improve the utilization of spectrum in cognitive radio networks. In DH-MAC, each secondary user (SU) switches its operation channel with a channel-hopping sequence which is adaptive to the activity of primary users (PUs). Our proposed DH-MAC mechanism enjoys the following merits. 1) It needs no dedicated...
Safety messaging plays an important role in Vehicle-to Vehicle (V2V) communications. By broadcasting packets via an 802.11 based technology, each vehicle informs the neighbors with its real-time status. Since this kind of information is life-critical, it should be received by all the adjacent vehicles with very high probability. In the previous work, we proposed a coded cooperative repetition approach...
In cognitive radio networks, cooperative spectrum sensing is employed to detect the presence of primary user quickly. In this paper, we study the sensing performance of a cognitive user U1 by allowing another cognitive radio user U2 to act as its relay (cooperation). We take the average power rather than the instantaneous power as the decision statistic, so, we can use multiple signal samples in each...
In detecting multiple targets by means of opportunity transmitters, parameter fusion of multiple sensors is a difficulty, which makes it expensive for the system to detect large numbers of targets simultaneously. This paper proposes a new positioning algorithm in the context of multiple non-cooperative illuminators, multiple sensors, to observe multiple targets. Firstly, each sensor extracts the TDOA...
Spammers are constantly creating sophisticated new weapons in their arms race with anti-spam technology, the latest of which is image-based spam. The newest image-based spam uses simple image processing technologies to vary the content of individual messages, e.g. by changing foreground colors, backgrounds, font types, or even rotating and adding artifacts to the images. Thus, they pose great challenges...
The evidence reasoning theory can generally represent uncertainty associated with propositions and datum and clearly distinguishes probability uncertainty caused by information deficiency from unknown caused by zero information. This paper proposed the conception of the risk basic strength assignment and built the general method and model of risk evaluation based on the evidence reasoning theory....
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.