Achieving QoS in Highly Unreliable Grid Environments

2011 ◽  
pp. 156-180
Author(s):  
Antonios Litke
Keyword(s):  
Ad Hoc ◽  
Research Work ◽  
Service Differentiation ◽  
Research Activity ◽  
Simple Task ◽  
Grid Environments ◽  
Significant Research ◽  
Technological Means ◽  
Prioritization Scheme

Grids can form the basis for pervasive computing due to their ability of being open, scalable, and flexible to various changes (from topology changes to unpredicted failures of nodes). However, such environments are prone to failures due to their nature and need a certain level of reliability in order to provide viable and commercially exploitable solutions. This is causing nowadays a significant research activity which is focused on the topic of achieving certain levels of Quality of Service (QoS) in highly unreliable environments (such as mobile and ad hoc Grids). This study will focus on the state-of-the-art analysis of the QoS aspects in Grids and how this is achieved in terms of technological means. A small survey and related work will be also presented. A more detailed analysis on the features of unreliable environments such as mobile Grids will be described. An innovative and efficient mechanism will be described, which is especially designed for such environments, in order to enhance them with the QoS attributes of reliability (fault tolerance through replication of tasks) and service differentiation to the Grid users through a simple task prioritization scheme. The results that this recent research work is presenting are promising for the future advancement of Grid commercialization in such environments.

scholarly journals FORMATION OF SCIENTIFIC RESEARCH ACTIVITY OF STUDENTS IN THE SYSTEM OF CREDIT EDUCATION

2020 ◽  
Vol 64 (3) ◽  
pp. 94-99
Author(s):  
N.S. Zhumasheva ◽  
◽  
N.A. Orahova ◽  
Keyword(s):  
Research Work ◽  
Independent Solution ◽  
Scientific Work ◽  
Research Activity ◽  
Training And Education ◽  
Technical Problems ◽  
Research Competencies ◽  
Scientific Technical ◽  
Important Means

The research work of students in the system of credit education is an important means of improving the quality of training and education of specialists who are able to creatively apply the achievements of scientific, technical and cultural progress in practice. Attracting students to scientific work allows them to develop their creativity, creativity and critical thinking, culture and ethics of scientific work.Research work of students in the system of credit education, which are highlighted by researchers,are aimed at the formation of research competencies of specialists: mastering by students the scientific method of cognition and, on its basis, in-depth and creative mastering of educational material; mastering the methodology and means of independent solution of scientific and technical problems; acquiring the skills of working in research teams and familiarization with the methods of organizing scientific work; direct participation in solving scientific and technical problems of society and the state

ON ARCHITECTURE FOR SLA-AWARE WORKFLOWS IN GRID ENVIRONMENTS

2005 ◽  
Vol 06 (03) ◽  
pp. 245-263 ◽  
Author(s):  
Dang Minh Quan ◽  
Odej Kao
Keyword(s):  
Data Transfer ◽  
A Priori ◽  
Research Work ◽  
Service Level ◽  
Explicit Statement ◽  
Grid Environments ◽  
Data Transfer Optimization ◽  
Deadline Constraints ◽  
Grid Resources

Service Level Agreements (SLAs) are currently one of the major research topics in Grid Computing, as they serve as a foundation for reliable and predictable Grids. SLAs define an explicit statement of expectations and obligations in a business relationship between provider and customer. Thus, SLAs should guarantee the desired and a-priori negotiated Quality of Service (QoS), which is a mandatory prerequisite for the Next Generation Grids. This development is proved by a manifold research work about SLAs and architectures for implementing SLAs in Grid environments. However, this work is mostly related to SLAs for standard, monolithic Grid jobs and neglects the dependencies between different steps of operation. The complexity of an SLA-specification for workflows grows significantly, as characteristics of correlated sub-jobs, the data transfer phases, the deadline constraints and possible failures have to be considered. Thus, an architecture for an SLA-aware workflow implementation needs sophisticated mechanisms for specification and management, sub-job mapping, data transfer optimization and fault reaction. Therefore, this paper presents an architecture for SLA-aware Grid workflows. The main contributions are an improved specification language for SLA-aware workflows, a mapping and optimization algorithm for sub-job assignment to Grid resources and a prototype implementation using standard middleware. Experimental measurements prove the quality of the development.

Guaranteeing Quality of Service in Mobile Ad Hoc Networks

2009 ◽  
pp. 587-594
Author(s):  
Noureddine Kettaf ◽  
Hafid Abouaissa ◽  
Thang VuDuong
Keyword(s):  
Quality Of Service ◽  
Ad Hoc Networks ◽  
Mobile Ad Hoc Networks ◽  
Ad Hoc ◽  
Qos Routing ◽  
Service Differentiation ◽  
Mobile Ad Hoc ◽  
Demand Routing ◽  
Hoc Networks

This article describes how resources are managed in MANETs (mobile ad hoc networks) so that quality of service (QoS) can be achieved to enable service differentiation. The article introduces in detail a QoS routing protocol called admission control enabled on-demand routing (ACOR) protocol. The article also presents the Global framework for functional architecture analysis in telecommunications (GAT) that is used to model ACOR and show its capability to provide different class of service for different mobile customers. For QoS routing protocols, this fashion of modeling is novel and investigates in details the relation between the customer and its provider and the complexity of the domain of MANETs.

Security in Mobile Ad Hoc Networks

2009 ◽  
pp. 541-558 ◽  
Author(s):  
Ekata Mehul ◽  
Vikram Limaye
Keyword(s):  
Wireless Networks ◽  
Quality Of Service ◽  
Mobile Ad Hoc Networks ◽  
Ad Hoc ◽  
Data Transfer ◽  
Research Work ◽  
Secure Routing ◽  
Hoc Networks ◽  
Network Administrators

Securing a “Wireless Ad Hoc Network” (WAHN) is a major concern of network administrators. This is particularly so in case of the wireless networks due to their unique characteristics that varies from the traditional networks. For example, WAHN are vulnerable to internal as well as external attacks relatively easily, as compared with traditional networks, because of their ability to be accessible from anywhere within their range. Many solutions have been proposed in this area and they are also being continuously improved. Most of these solutions involve encryption; secure routing, quality of service, and so forth. However, each of these solutions is designed to operate in a particular situation; and it may fail to work successfully in other scenarios. This particular research work offers an alternate to improving the trustworthiness of the neighbourhood and securing the routing procedure. This security is achieved by dynamically computing the trust in neighbours and selecting the most secure route from the available ones for the data transfer. There is also a provision to detect the compromised node and virtually removing it from the network.

It is possible to predict Sangiovese wine quality through a limited number of variables measured on the vines

OENO One ◽  
2010 ◽  
Vol 44 (4) ◽  
pp. 207 ◽  
Author(s):  
Pierluigi Bucelli ◽  
Edoardo Antonio Costantino Costantini ◽  
Paolo Storchi
Keyword(s):  
Accumulation Rate ◽  
Sugar Content ◽  
Research Work ◽  
Multivariate Regression Analysis ◽  
Sugar Accumulation ◽  
Wine Quality ◽  
Research Activity ◽  
Wide Variability ◽  
Selection Of

<p style="text-align: justify;"><strong>Aims</strong>: The research work aimed at creating and testing a method to evaluate vine performance of Sangiovese (VPS), in particular, a method able to predict the potential oenological result through a limited number of variables measured on the vines.</p><p style="text-align: justify;"><strong>Methods and results</strong>: A matching table was created on the basis of literature and the experience acquired over twenty years of research activity on Sangiovese vine and wine quality in Tuscany, which allowed the selection of eight viticultural parameters and three VPS classes. In order to validate the matching table, a specific experiment was conducted during the years 2002 and 2003 in 10 vineyards (selected from 7 farms) representative of the main soils and climates of the vine cultivation areas of the Province of Siena (Italy). The experimental results validated the proposed matching table through a non parametric statistical analysis. A multivariate regression analysis between wine sensory evaluation (score) and viticultural parameters significantly predicted wine quality even with only 4 grape parameters (<em>P</em> &lt; 0.05).</p><p style="text-align: justify;"><strong>Conclusion</strong>: It was possible to predict VPS by means of a matching table based upon eight simple viticultural parameters. The reliability of the wine quality prediction increased proportionally according to the number of viticultural parameters, but remained rather high (R<sup>2</sup> = 0.606) when taking into account only sugar content, sugar accumulation rate, mean berry weight, and extractable polyphenol index (EPI).</p><p style="text-align: justify;"><strong>Significance and impact of the study</strong>: It is now possible to predict the quality of Sangiovese wines with a few selected grape parameters. Because of the wide variability in soil and climatic condition of the viticultural areas of the Province of Siena, where the method was developed, and the strong climatic contrast between the years when the method was validated, the use of both matching table and multiple regression is recommended for VPS prediction in Mediterranean environments.</p>

scholarly journals Student-supervisor interaction problems in joint research activity

2020 ◽  
Vol 87 ◽  
pp. 00030
Author(s):  
O.A. Selivanova ◽  
O.I. Dubrovina ◽  
O.N. Rodina
Keyword(s):  
Research Training ◽  
Research Work ◽  
Scientific Work ◽  
University Education ◽  
State University ◽  
Research Activity ◽  
Joint Research ◽  
Additional Information ◽  
Writing Research

Growing interest in improving the quality of student’s research activity in higher education has led to an emphasis on student-supervisor interaction in joint research activity. The study presented here was carried out in Tyumen State University, Tyumen, Russia. The participants were 30 supervisors and 60 students from the Pedagogical Institute. The study defined student and supervisor interaction problems and characterized the ways of student-supervisor interaction that reduce student’s motivation for a creative approach to writing research work when student’s research work is perceived as (1) supervisor’s burden, (2) a source of supervisor’s innovative ideas, (3) a source of additional information or (4) a source of primary information processing for supervisor’s scientific work. Implications are given to prevent ineffective ways of student-supervisor interaction and improve the quality of student’s research training in multi-level university education.

scholarly journals Security Based Neighbour Selection for Vehicular Ad-Hoc Networks

2019 ◽  
Vol 8 (10) ◽  
pp. 588-591
Keyword(s):  
Information Exchange ◽  
Vehicular Ad Hoc Networks ◽  
Ad Hoc ◽  
Research Work ◽  
Security And Privacy ◽  
Neighbor Selection ◽  
Work Security ◽  
Hoc Networks ◽  
Safety Applications

This Research work acquaint with algorithms Security Based Neighbor Selection. In Security based neighbor selection vehicles with authentic Id can take part in the network. Disseminating messages in an open access environment makes a real security and privacy challenges in VANETs. For using the application of VANET effectively the Quality of service and security should be maintained. In this piece of work Security Based Neighbor Selection technique is used to enhance the QoS and safety applications in VANETs by providing unique ID to the vehicles so that the secure transmission of messages takes place. This technique is proposed to maintain the security and QoS and to accomplish the aim of reliable information exchange. By using NS-3 simulator we accomplished that our proposed technique shows an enhancements regarding awareness in safety and upgrades QoS metrics in VANETs

scholarly journals Fuzzy based Combined Trust Scheme for Secure Routing in MANET (FCTRS)

2020 ◽  
Vol 9 (4) ◽  
pp. 1469-1474
Keyword(s):  
Black Hole ◽  
Ad Hoc ◽  
Mobile Ad Hoc Network ◽  
Research Work ◽  
Secure Routing ◽  
Mobile Nodes ◽  
Ad Hoc Routing ◽  
Data Packets ◽  
Distance Vector

Mobile Ad Hoc network (MANET) is a self-configuring network consisting of mobile nodes without any fixed infrastructure. However due to the nodes has not any fixed infrastructure in MANET, it is susceptible to various security attacks like data modification, information sniff, due to low energy, computing ability and bandwidth. In MANET Black hole is also an attack and it is difficult to detect and prevent. The lack of quality in security aspects of ad-hoc routing protocols won’t provide reliability in the data packets movement between source and destination nodes. Implementing the routing decision with trust is an important one in the MANNET security. Hence, this research work propose an enhanced Fuzzy based combined trust scheme (FCTRS) based on public trust and Quality of Service (QoS) trust to detect black hole attack. It provides secure routing based on certificate authority (CA) to improve the performance of Ad-hoc On-demand Distance Vector (AODV). The results will show the performance improvement of proposed protocol over Enhanced Trusted Routing Scheme with Pattern Discovery (ETRS-PD) and the protocol AODV. The metrics in the performance of network examined with different conditions of mobility and the presence of black hole node positions.

PROFESSORS' PERCEPTION OF SCIENTIFIC ACTIVITY IN THE FACULTY OF MEDICAL SCIENCES OF THE UNIVERSITY OF GUAYAQUIL

2020 ◽  
Vol 8 (10) ◽  
pp. 70-76
Author(s):  
Jorge Daher Nader ◽  
Amelia Patricia Panunzio ◽  
Marlene Hernández Navarro
Keyword(s):  
Scientific Research ◽  
Scientific Activity ◽  
Medical Sciences ◽  
Research Activity ◽  
University Environment ◽  
Empirical Level ◽  
Teachers And Students ◽  
Scientific Nature ◽  
The University

Research is considered a function aimed at obtaining new knowledge and its application for the solution to problems or questions of a scientific nature, The universities framed in the fulfillment of their social function have a complex task given by training a competent professional who assumes research as part of their training and who learns to ask questions that they are able to solve through scientific research.  Scientific research is an indicator of the quality of processes in the university environment, so it must be increased by virtue of the results of the work carried out by research teachers and students the objective of this work is to know the perception of the teachers of the Faculty of Medical Sciences of the University of Guayaquil about the scientific activity. Objective: to know the perception of the teachers of the Faculty of Medical Sciences of the University of Guayaquil about the scientific activity. Methods: theoretical and empirical level were used, a questionnaire with closed questions aimed at knowing the opinions on the research activity in this institution was applied. Result: that of the sample analyzed 309 (39.3%) said they agreed with the training for the writing of scientific articles. 38.6% said they agree with the training on research projects. Conclusion: that teacher’s research should be enhanced to ensure the formation and development of research skills in students.

A Bandwidth and Energy Aware QoS Routing Protocol for Enhanced Performance in Ad-hoc Networks

2019 ◽  
Vol 9 (2) ◽  
pp. 203-213
Author(s):  
Priyanka Bharadwaj ◽  
Surjeet Balhara
Keyword(s):  
Ad Hoc Networks ◽  
Routing Protocol ◽  
Ad Hoc ◽  
Qos Routing ◽  
Delivery Ratio ◽  
Energy Aware ◽  
Multimedia Services ◽  
Average Delay ◽  
Hoc Networks

Background & Objective: There are some challenging issues such as providing Quality of Service (QoS), restricted usage of channels and shared bandwidth pertaining to ad-hoc networks in a dynamic topology. Hence, there is a requirement to support QoS for the application environment and multimedia services in ad-hoc networks with the fast growing and emerging development of information technology. Eventually, bandwidth is one of the key elements to be considered. Methods: Energy aware QoS routing protocol in an ad-hoc network is presented in this article. Results and Conclusion: The simulation results indicate that the improved protocol outperforms Adhoc On-Demand Distance Vector (AODV) routing protocol in terms of QoS metric such as throughput, packet delivery ratio, loss rate and average delay.

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