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Mobile delay tolerant network (MDTN) is a kind of no stabilized end-to-end connection network and has the characteristics of long time delay and intermittent interruption. To forward a network packet, MDTN relies on the relay nodes, using the “store — carry — forwards” routing method. However, nodes will be selfish and unwilling to forward messages for others due to the limited resources such as energy,...
In order to ensure the security of mobile ad hoc networks (MANETs), the research on certificateless key management scheme is attracting more and more attention. The certificateless key management scheme can well resist the key escrow problem and it is very suitable for MANET, which is source-constrained and has no public key infrastructure. In this paper, we give an overview of some recent certificateless...
Delay Tolerant Network (DTN) is widely applied to the situation that difficult to deploy infrastructure. It has the characteristics of nodes distributed sparsely, connect unstably, large delay and high bit error rate. These characteristics of DTN, lead to the data efficient transmission encountered a certain challenge. Network coding is proposed to improve network throughput, balance network load...
With the rapid development of Internet technology, the mobile terminal as a carrier get more and more popular, such as smart phones, tablet PCs and other mobile wireless communicated devices, so that the MDTN (Mobile Delay Tolerant Network) has become a hot topic in the wireless sensor networks. At the same time these mobile devices have the advantages of mobility and portability, but there are some...
Mobile Delay Tolerant Network (MDTN) is widely applied in several scenarios, especially in suitability for communication without infrastructure. Moreover, caching problem is still a key point of the research. In this paper, we mainly describe caching mechanisms under mobile delay tolerant network, which is divided into two parts, one is cooperation caching mechanism, which has been deeply studied,...
Recently, content delivery has become a hot research field. However, with the increase of network scale and the mobility of users, content delivery in traditional network needs to deploy a number of content servers to cache contents, so as to satisfy multilevel users. Deploying so many servers will lead to a lot of costs, and it will cause the delay of network increase at the same time. Therefore,...
Three-dimensional (3D) Co3O4 hierarchical microcrystals assembled by two-dimensional (2D) plate-like nanocrystals have been successfully prepared via annealing 3D α-Co(OH)2 hierarchical microcrystals. XRD results demonstrated that the pure phase α-Co(OH)2 hierarchical microcrystals were converted into pure cubic phase Co3O4 hierarchical microcrystals after annealing at 400°C for 2h. SEM observations...
This paper designs a campus network according to the characteristics of the terrain in Inner Mongolia University. The outdoor area where contains the rockeries or lake uses the hybrid network mode of WiFi-Mesh through investing the specific features of terrain in campus. The routing protocol used in wireless mesh network is improved according to the characteristics of wireless mesh network and the...
Considering mobility and portability, the equipment used in the Mobile Delay Tolerant Network (MDTN) usually use the batteries with limited capacity, which makes the equipment energy limited in MDTN. Due to the lifetime and performance of MDTN affected by equipment easily, energy efficiency optimization of the equipment becomes more and more significant. In this paper, the features shown in mobile...
Delay Tolerant Network (DTN) shows some features like link frequent interruptions, long delays, limited resources and so on, while nodes fight each other to win the network resources in the process of communication, which can lead to network congestion in delay tolerant network. Therefore, congestion control is a key issue in delay tolerant network research. The present congestion control strategies...
In Delay and Disruption Tolerant Networks (DTN), because of its intermittent connectivity features, resulting in packet transmission process cannot ensure end to end path, usually employ a "store - carry - forwards" approach to forward the message. Currently the key method to solve information exchange in DTN is select forwarding nodes effectively. Made the information deliver to the destination...
With the popularization of portable devices equipped with wireless communication capability, Mobile Delay Tolerant Network (MDTN) gets extensive attention of scholars. Infrastructureless networking with portable devices has become a typical scenario in MDTN. With regard to the infrastructureless MDTN scenario composed by portable devices, we propose a social-aware hierarchical multicast distribution...
A more detailed community structure can contribute to a better understanding of the network, which can also benefit efficient routing protocols and QoS schemes designing. For an Opportunistic Network which consists of different kinds of mobile nodes, its topology changes over time. Therefore the community detection becomes more difficult than static situations. Moreover the overlapping community detection...
With the popularization and development of vehicles, smart handheld devices and Internet technologies, vehicles and the passengers travelling on the highway need to download large data files, such as music and video. But on the highway, the network, which intermittently connected to the Internet, can not meet people's requirements. In this paper, we proposes a novel method to access to the internet...
The aim of this work was to investigate the potential of Eisenia foetida to survival and grow in the sludge and increase the bioavailability of heavy metals in it which came from a wastewater treatment plant of China University of Mining and Technology under laboratory conditions. The results indicated that Eisenia foetida could not only grow normally in the sludge mixed with a certain concentration...
Taking the residual sludge from wastewater treatment plant of China University of Mining and Technology as research object, through activating machenism experiments, study the growth of Eisenia foetida and the impact on bioavailability of heavy metals by Eisenia foetida. The results showed that the Eisenia foetida could grow normally in the sludge to a certain concentration of Pb, Cd, had good tolerance...
To deal with attribute reduction in incomplete information systems, this paper proposed a direct method of attribute relative reduction based on rough set theory. This reduction algorithm gives the concept of tolerance relationship similar matrix via extending equivalence relationship of rough set theory, which is called tolerance relationship. It introduces the generalized decision function to solve...
Hybrid content distribution network (HCDN), integrating complementary advantages of CDN and P2P, is used to improve efficiency of large-scale content distribution. In this paper, to achieve in-depth understanding of HCDN??s effectiveness, we carry out a detailed performance evaluation based on deterministic fluid model. We also provide numeric results of HCDN, comparing with conventional CDN and P2P...
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