False alarm detection to improve data accessibility in replica allocation over MANETs

2015 ◽  
Author(s):  
S S Gayathry ◽  
S Perumal Sankar
Keyword(s):  
False Alarm ◽  
Data Accessibility ◽  
Replica Allocation

Data replication techniques in the mobile ad hoc networks

2019 ◽  
Vol 15 (3/4) ◽  
pp. 174-198
Author(s):  
A. Abdollahi Nami ◽  
L. Rajabion
Keyword(s):  
Ad Hoc ◽  
Data Replication ◽  
Data Access ◽  
Data Consistency ◽  
Mobility Limitations ◽  
Data Accessibility ◽  
Content Type ◽  
Advantages And Disadvantages ◽  
Replica Allocation ◽  
The Future

Purpose A mobile ad hoc network (MANET) enables providers and customers to communicate without a fixed infrastructure. Databases are extended on MANETs to have easy data access and update. As the energy and mobility limitations of both servers and clients affect the availability of data in MANETs, these data are replicated. The purpose of this paper is to provide a literature review of data replication issues and classify the available strategies based on the issues they addressed. Design/methodology/approach The selected articles are reviewed based on the defined criteria. Also, the differences, the advantages and disadvantages of these techniques are described. The methods in the literature can be categorized into three groups, including cluster-based, location-based and group-based mechanisms. Findings High flexibility and data consistency are the features of cluster-based mechanisms. The location-based mechanisms are also appropriate for replica allocation, and they mostly have low network traffic and delay. Also, the group-based mechanism has high data accessibility compared to other mechanisms. Data accessibility and time have got more attention to data replication techniques. Scalability as an important parameter must be considered more in the future. The reduction of storage cost in MANETs is the main goal of data replication. Researchers have to consider the cost parameter when another parameter will be influenced. Research limitations/implications Data replication in MANETs has been covered in different available sources such as Web pages, technical reports, academic publications and editorial notes. The articles published in national journals and conferences are ignored in this study. This study includes articles from academic main international journals to get the best capability. Originality/value The paper reviews the past and the state-of-the-art mechanisms in data replication in MANET. Exclusively, data replication’s main goal, existing challenges, research terminologies and mechanisms in MANET are summarized using the answers to the research questions. This method will help researchers in the future to develop more effective data replication method in MANET.

scholarly journals Secure Data Replication Management Scheme with Better Data Accessibility

2019 ◽  
Vol 8 (12) ◽  
pp. 4484-4488
Keyword(s):  
Cloud Computing ◽  
Data Replication ◽  
Data Availability ◽  
Computing Technology ◽  
Data Accessibility ◽  
Access Frequency ◽  
Management Scheme ◽  
Replica Allocation ◽  
Cloud Server ◽  
Secure Data

Cloud computing technology has gained substantial research interest, due to its remarkable range of services. The major concerns of cloud computing are availability and security. Several security algorithms are presented in the literature for achieving better security and the data availability is increased by utilizing data replicas. However, creation of replicas for all the data is unnecessary and consumes more storage space. Considering this issue, this article presents a Secure Data Replication Management Scheme (SDRMS), which creates replicas by considering the access frequency of the data and the replicas are loaded onto the cloud server by considering the current load of it. This idea balances the load of the cloud server. All the replicas are organized in a tree like structure and the replicas with maximum hit ratio are placed on the first level of the tree to ensure better data accessibility. The performance of the work is satisfactory in terms of data accessibility, storage exploitation, replica allocation and retrieval time.

REPLICA LOCATION MANAGEMENT FOR DATA SHARING IN MOBILE AD HOC NETWORKS

2006 ◽  
Vol 07 (01) ◽  
pp. 75-89 ◽  
Author(s):  
TAKAHIRO HARA
Keyword(s):  
Ad Hoc Networks ◽  
Ad Hoc ◽  
Data Access ◽  
Data Accessibility ◽  
Mobile Hosts ◽  
Replica Allocation ◽  
Replica Location ◽  
Key Issues ◽  
Past Data ◽  
Hoc Networks

To improve data accessibility in ad hoc networks, we have proposed a few methods of replicating data items on mobile hosts by considering the data access frequencies from mobile hosts to each data item and the network topology. In this paper, we address techniques to manage locations of data items or replicas and efficiently forward access requests to the locations. In order to manage locations of data items efficiently, a key issues is predicting the locations of data items that dynamically change. To predict the locations of data items, we use the information on replica allocation at every relocation time and the logs of past data accesses.

scholarly journals Replica Dissemination and Update Strategies in Cluster-Based Mobile Ad Hoc Networks

2006 ◽  
Vol 2 (4) ◽  
pp. 193-209 ◽  
Author(s):  
Mieso K. Denko ◽  
Hua Lu
Keyword(s):  
Data Management ◽  
Data Storage ◽  
Ad Hoc ◽  
Data Access ◽  
Reliable Data ◽  
Data Consistency ◽  
Data Accessibility ◽  
Message Queue ◽  
Replica Allocation ◽  
Mobile Ad Hoc

A mobile ad hoc network (MANET) is a collection of wireless mobile nodes that forms a temporary network without the aid of a fixed communication infrastructure. Since every node can be mobile and network topology changes can occur frequently, node disconnection is a common mode of operation in MANETs. Providing reliable data access and message delivery is a challenge in this dynamic network environment. Caching and replica allocation within the network can improve data accessibility by storing the data and accessing them locally. However, maintaining data consistency among replicas becomes a challenging problem. Hence, balancing data accessibility and consistency is an important step toward data management in MANETs. In this paper, we propose a replica-based data-storage mechanism and undelivered-message queue schemes to provide reliable data storage and dissemination. We also propose replica update strategies to maintain data consistency while improving data accessibility. These solutions are based on a clustered MANET where nodes in the network are divided into small groups that are suitable for localized data management. The goal is to reduce communication overhead, support localized computation, and enhance scalability. A simulation environment was built using an NS-2 network simulator to evaluate the performance of the proposed schemes. The results show that our schemes distribute replicas effectively, provide high data accessibility rates and maintain consistency.

Hit and False-Alarm Rates of Selected ABR Indices in Differentiating Cochlear Disorders From Acoustic Tumors

1996 ◽  
Vol 5 (1) ◽  
pp. 90-96 ◽  
Author(s):  
Frank E. Musiek ◽  
Cynthia A. McCormick ◽  
Raymond M. Hurley
Keyword(s):  
False Alarm ◽  
Amplitude Ratio ◽  
High Specificity ◽  
Auditory Brainstem ◽  
Latency Difference ◽  
Cochlear Pathology ◽  
Brainstem Response ◽  
Absolute Latency ◽  
Two Indices ◽  
Low Sensitivity

We performed a retrospective study of 26 patients with acoustic tumors and 26 patients with otologically diagnosed cochlear pathology to determine the sensitivity (hit rate), specificity (false-alarm rate), and efficiency of six auditory brainstem response indices. In addition, a utility value was determined for each of these six indices. The I–V interwave interval, the interaural latency difference, and the absolute latency of wave V provided the highest hit rates, the best A’ values and good utility. The V/I amplitude ratio index provided high specificity but low sensitivity scores. In regard to sensitivity and specificity, using the combination of two indices provided little overall improvement over the best one-index measures.

The Fusion of False Alarm and False Hope

1985 ◽  
Vol 30 (3) ◽  
pp. 207-208
Author(s):  
Jeffrey Z. Rubin
Keyword(s):  
False Alarm
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