Abstract This paper introduced a new method to discover the taxi Origin-Destination areas of interest based on functional region division to resolve the problem that taxis distribution is unreasonable. The problem occurs due to dispatching t axis is not in line with the taxi demand in different functional regions during different time periods. The method proposed in this paper clustered t axi... This paper introduced a new method to discover the taxi Origin-Destination areas of interest based on functional region division to resolve the problem that taxis distribution is unreasonable. The problem occurs due to dispatching t axis is not in line with the taxi demand in different functional regions during different time periods. The method proposed in this paper clustered t axi Origin-Destination data points of the functional region with the improved DB-SCAN algorithm and yielded the areas of interest with the statistical method named Chi-square distribution. The accuracy and credibility of the method was evaluated through two indicators called coverage and hit ratio and a comparison analysis on situations of different regions. The experiment proved that the proposed method can effectively discover and predicted the taxi Origin- Destination areas of interest in different functional regions in different time periods. Read More Read Less

Abstract Because of their exceptional qualities, WSNs are grabbing attention in the research community. WSNs are very less into view. Subsequently it is easily possible for an assaulter to catch a node physically, altering its code and getting private data like cryptographic keys. Wireless medium is inherently broadcast in nature which makes it open to attacks. These attacks can bother the operation of WSN... Because of their exceptional qualities, WSNs are grabbing attention in the research community. WSNs are very less into view. Subsequently it is easily possible for an assaulter to catch a node physically, altering its code and getting private data like cryptographic keys. Wireless medium is inherently broadcast in nature which makes it open to attacks. These attacks can bother the operation of WSN and can even kill the purpose of their deployment [3]. Keeping in mind the end goal to ensure the data in WSN, some approaches are severely required that can make data transmission more secure from the attackers. Node replication attack or clone attack is a standout amongst the most destructive and perilous risk to an unattended wireless sensor network in light of the fact that in this attack, an adversary not only compromises the sensor nodes but can also carry out a large class of internal attacks for instance DoS attack, Sybil attack, and Black hole, and wormhole attack. Numerous strategies have been proposed for the detection of node replication attack and some fairly serious limitations like the base station introduce a single point of failure, and any compromise of the base station makes the solution useless. This leads to the motivation to work in this research area. A solution to avoid the node replication attack has been proposed. The solution will be implemented in NS-2. Read More Read Less

Abstract In the wireless communication system, an improved cooperative scheme using extra relays for the broadcasting system is proposed. In order to do reliable transmission, cyclic delay diversity (CDD) and space-time cyclic delay (STCDD) are used in the proposed scheme. In the broadcasting system, bit error rate (BER) performance and throughput performance are degraded if the destination user is located in the edge of... In the wireless communication system, an improved cooperative scheme using extra relays for the broadcasting system is proposed. In order to do reliable transmission, cyclic delay diversity (CDD) and space-time cyclic delay (STCDD) are used in the proposed scheme. In the broadcasting system, bit error rate (BER) performance and throughput performance are degraded if the destination user is located in the edge of the broadcasting base station (BBS) cell coverage. The conventional scheme employs two CBSs and relays. However, if the destination user differs from a cellular base station (CBS), communication performance is decreased. Therefore, the cooperative scheme using two BBSs and extra relays is proposed to improve the performance and guarantee the quality of the communication. The simulation result implies that the proposed scheme can obtain high performance for the destination user in the BBS edge. Read More Read Less