An Extended Ameliorated Round Robin Algorithm in Cloud Computing for Task Scheduling | Chapter 7 | Mathematics and Computer Science: Contemporary Developments Vol. 4

Cloud computing is a cutting-edge technology that provides a variety of services on demand. Due to the substantial volume of requests received from cloud users, it is crucial to manage these requests efficiently. As such, task scheduling becomes a vital aspect of cloud computing. The allocation of computational resources within the cloud is managed by cloud providers, highlighting the necessity for designing high-efficiency scheduling algorithms compatible with diverse computing paradigms.

 

This chapter introduces a new method for task scheduling in cloud computing called the Ameliorated Round Robin Algorithm (ARRA). The proposed algorithm enhances the traditional Round Robin approach by developing an optimal time quantum based on the average burst time of tasks. This is achieved through both fixed and dynamic methodologies, allowing the algorithm to adapt to varying workloads more effectively.

 

The chapter provides a comprehensive analysis of the ARRA, demonstrating its superior performance through experimental results. These results indicate that ARRA significantly outperforms existing algorithms, such as Improved Round Robin (IRR), Enhanced Round Robin (ERR), Dynamic Time Quantum Approach (ARR), and Enhanced Round Robin with RAST (RAST ERR). The improvements are evident in key performance metrics, including average waiting time, average turnaround time, and response time.

 

By optimizing these metrics, ARRA not only enhances the efficiency of task scheduling in cloud computing but also contributes to better resource utilization and user satisfaction. This chapter delves into the technical details of the ARRA, provides comparative analyses with other algorithms, and discusses the implications of these findings for future research and practical applications in cloud computing environments.

 

Author (s) Details

Nermeen Ghazy
Department of Mathematics, Faculty of Science (Girls), Al-Azhar University, Cairo, Egypt.

 

Afaf Abdelkader
Department of Mathematics, Faculty of Science (Girls), Al-Azhar University, Cairo, Egypt.

 

Mervat S. Zaki
Department of Mathematics, Faculty of Science (Girls), Al-Azhar University, Cairo, Egypt.

 

Kamal A. Eldahshan
Department of Mathematics, Faculty of Science, Al-Azhar University, Cairo, Egypt.

 

Please see the book here:- https://doi.org/10.9734/bpi/mcscd/v4/1711

Accuracy of XCT to Perform Dimensional Measurements on Different Measurands | Chapter 2 | Science and Technology: Developments and Applications Vol. 1

As additive manufacturing is increasingly used in industry to manufacture complex shapes with internal features, x-ray computed tomography (XCT) has become an essential tool for performing dimensional measurements. Thus, an x-ray computed tomography (XCT) interlaboratory comparison campaign, involving an aluminium-machined object, whose dimensions (92 × 78 × 63 mm³) are significant for a 225 kV XCT system, was performed for the purpose of investigating the performances of industrial XCT systems for dimensional measurements in terms of accuracy, i.e. precision and trueness, and to evaluate the influence of the measurement protocol (i.e. measurement strategy), of the operator and of the software on the results by comparison to reference measurements. The campaign involved seven French XCT users and system suppliers. Seven measurands were selected for the comparison campaign, including one distance, three diameters, one cylindricity, one coaxiality and one true position. The results of the comparison campaign were analysed to evaluate the performance of XCT systems implementing ISO 5725-2 related to accuracy, and more specifically to one of the two components of accuracy: precision, and ISO 5725-4 related to the other component of accuracy: trueness. In this campaign, we came to the conclusion that the measurement strategy is predominant, except for distance; that the measurement process is affected by the operator only for cylindricity and coaxiality; that there is no or little influence of the software except for coaxiality and position; and that a volumetric Gaussian filter allows improving the measurements only for some participants’ measurements. Furthermore, different behaviours, in terms of precision and trueness, are observed depending on the type of measurands when performed by different operators. The diameter measurements are reproducible with XCT, lower than 30 μm which corresponds to a subvoxelic factor of 2.5 and the trueness is lower than 22 μm. The distance measurement is also reproducible with XCT, 15 μm which corresponds to a subvoxelique factor of 4.9 and the trueness is 8 μm. For these measurands, their measurements do not depend on the used XCT system. However, the XCT reproducibility for cylindricity, coaxiality and position is worse as well as the trueness except for the position which has a trueness of 1 μm. The process measurement should be revised regarding cylindricity and coaxiality measurements which have been done (see addendum). Finally, overall, the ability of the participants to perform measurements with XCT, whatever their system, is statistically comparable except for a few measurements. In this article, the results of an interlaboratory comparison campaign on XCT dimensional measurements have been presented.

 

Author (s) Details

 

Anne-Françoise Obaton
Laboratoire National de Métrologie et D’essais (LNE), 1 Rue Gaston Boissier, 75015 Paris, France.

 

Anis Tanich
Laboratoire National de Métrologie et D’essais (LNE), 1 Rue Gaston Boissier, 75015 Paris, France.

 

Nicolas Fischer
Laboratoire National de Métrologie et D’essais (LNE), 1 Rue Gaston Boissier, 75015 Paris, France.

 

Sophie Antona
SARL 3D Casting, Z.I. Genève Océan, 71520 Dompierre-Les-Ormes, France.

 

Florian Montagner
Baker Hughes Digital Solutions France, 68 Chemin Des Ormeaux, 69760 Limonest, France.

 

Sylvain Genot
Nikon Metrology, 39 rue du Bois Chaland, 91090 Lisses, France.

 

Sébastien Brzuchacz
Cetim, 52 Av. Félix Louat, 60300 Senlis, France.

 

Patrick De Soete
COMET Yxlon GmbH, Essener Bogen, 22419 Hamburg, Germany.

 

Kevin Duboeuf
Carl Zeiss SAS, 25 Rue Saint-Blaise, 72300 Sablé-sur-Sarthe, France.

 

Thomas Beuvier
Carl Zeiss SAS, 25 Rue Saint-Blaise, 72300 Sablé-sur-Sarthe, France.

 

Rakesh Nanjareddy
Volume Graphics GmbH (VG), Speyerer Straße 4-6, 69115 Heidelberg, Germany.

 

Nicolas Coutant
Volume Graphics GmbH (VG), Speyerer Straße 4-6, 69115 Heidelberg, Germany.

 

Nicolas Cochennec
Safran Composites, 33 Avenue de la Gare, 91760 Itteville, France.

Lionel Gay
Safran Composites, 33 Avenue de la Gare, 91760 Itteville, France.

 

Please see the book here:- https://doi.org/10.9734/bpi/stda/v1/2480