BACKGROUND Cluster sample study designs are cost effective, however cluster samples violate the simple random sample assumption of independence of observations. Failure to account for the intra-cluster correlation of observations when sampling through clusters may lead to an under-powered study. Researchers therefore need estimates of intra-cluster correlation for a range of outcomes to calcula...

This work presents a novel GPS-based Quorum Hybrid Routing Algorithm (GPS-QHRA), which is a cluster-based approach protocol for cellular-based ad hoc wireless networks. Each node equipped with GPS knows in which zones they are located. Based on the results reported in [12], cellular-based management can achieve better behavior in reducing the number of flooding messages, better bandwidth manage...

In this paper, we present the creation process and the purpose behind the Midnight cluster. It is disguised as a computer laboratory during the day, but turns into a high performance compute cluster during the night. The main focus of this paper is on the basic issues with creating a part time compute cluster. The Midnight cluster was constructed to serve both as a CPU harvester and as a platfo...

Clustering provides an efficient management method and energy balancing scheme for ad-hoc sensor networks. Cluster head is the most important role in a cluster and it acts as a local data coordinator and maintains cluster information. Once malicious nodes or lower energy nodes are selected as cluster heads, the system would be greatly affected. Thus selection of trusted cluster heads with prope...

In this paper, we propose a new network management protocol to address the unique challenges of managing cognitive radio ad hoc networks that have distributed, multihop architectures with dynamic spectrum availability. We focus on performance management for these networks, and address the problem of network congestion for secondary users, because of its significant impact on data throughput. Sp...

The recent growth of the World Wide Web has sparked new research into using the Internet for novel types of group communication, like multiparty videoconferencing and real-time streaming. Multicast has the potential to be very useful, but it suffers from many problems like security. To achieve secure multicast communications with the dynamic aspect of group applications due to free membership j...

the purpose of this descriptive-correlation study was to investigate effective factors on rural people’s non-participation of mahabad’s dam catchment in watershed management projects. the research instrument was structural questionnaire with close-ended questions, which its validity confirmed by panel of academic staff and reliability of questionnaire was confirmed. the target population of thi...

Objective: To investigate the effect of cluster airway management in patients with severe inhalation

High performance computing more and more is used in all kinds of fields. But, for the common user, there are several questions on implementing the process of competing on the specialized cluster: such as expense high, management difficulty and operation complex and so on. To these problems, this article designs and realizes the high performance computing environment based on Linux cluster after...