The Experts below are selected from a list of 731235 Experts worldwide ranked by ideXlab platform
Jean-yves Berthou - One of the best experts on this subject based on the ideXlab platform.
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Ghost Process: a Sound Basis to Implement Process Duplication, Migration and Checkpoint-Restart in Linux Clusters
2005Co-Authors: Geoffroy Vallée, Renaud Lottiaux, David Margery, Christine Morin, Jean-yves BerthouAbstract:Process management Mechanisms (Process duplication, migration and checkpoint-restart) are very useful for high performance and high availability in clustering systems. The single system image approach aims at providing a global Process management service with Mechanisms for Process checkpoint, Process migration and Process duplication. In this context, a common Mechanism for Process virtualization is highly desirable but traditional operating systems do not provide such a Mechanism. This paper presents a kernel service for Process virtualization called ghost Process, extending the Linux kernel. The ghost Process Mechanism has been implemented in the Kerrighed single system image based on Linux.
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Ghost Process: a Sound Basis to Implement Process Duplication, Migration and Checkpoint/Restart in Linux Clusters
2005Co-Authors: Geoffroy Vallée, Renaud Lottiaux, David Margery, Christine Morin, Jean-yves BerthouAbstract:Today, clusters are widely used to execute numerical applications. Mechanisms are needed to ease cluster use and to take advantage of the cluster distributed resources. Process management Mechanisms are very useful in this respect. Process duplication is needed for parallel application deployment, dynamic load balancing relies on Process migration and Process checkpoint/restart is needed to tolerate node failures during the execution of long-running applications. A kernel level approach allows to efficiently implement all these Mechanisms. However, they are very complex to implement and to maintain. Nevertheless they are all based on a common concept: Process virtualization which provides a mean to extract the state of a Process from the operating system executed on each cluster node. This paper presents a Process virtualization Mechanism called ghost Process, implemented at kernel level which can be used by system programmers to easily implement various Process management Mechanisms. The ghost Process Mechanism has been implemented in Kerrighed single system image cluster operating system based on Linux. It has been used to efficiently and easily implement Process duplication, migration and checkpoint/restart in Kerrighed.
H. Unal - One of the best experts on this subject based on the ideXlab platform.
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Abrasive Wear Volume Maps for PA6 and PA6 Composites Under Dry Working Condition
Applied Composite Materials, 2008Co-Authors: A. Mimaroglu, H. UnalAbstract:In this study the wear volume map is obtained and considered for evaluation of the abrasive wear performance for polyamide (PA6) and PA6 composites. Polyamide composites were tailored using 25 wt.% glass bead, 20 wt.% talc and 30 wt.% wollastonite fillers. In this work, the influence of filler materials, abrasion surface roughness and applied loading values on abrasive wear performance of PA6 and PA6 composites were evaluated. Experimental abrasive wear tests were carried out at atmospheric condition using pin-on-disc rig arrangement. Tests were performed under 4, 6, 8 and 10 N load values, traveling speed of 1 m/s and abrasion surface roughness values of 5, 20 and 45 μm. Wear volume maps were obtained and the results showed that the lowest wear volume rate for PA is reached using glass bead filler. Furthermore, the results also showed that the higher is the applied load and the roughness of the abrasion surface, the higher is the wear rate. Finally it is also concluded that abrasive wear Process Mechanism include ploughing Mechanism and delimitation of filler tips.
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Abrasive Wear Volume Maps for PA6 and PA6 Composites Under Dry Working Condition
Applied Composite Materials, 2008Co-Authors: A. Mimaroglu, U. Sen, H. UnalAbstract:In this study the wear volume map is obtained and considered for evaluation of the abrasive wear performance for polyamide (PA6) and PA6 composites. Polyamide composites were tailored using 25 wt.% glass bead, 20 wt.% talc and 30 wt.% wollastonite fillers. In this work, the influence of filler materials, abrasion surface roughness and applied loading values on abrasive wear performance of PA6 and PA6 composites were evaluated. Experimental abrasive wear tests were carried out at atmospheric condition using pin-on-disc rig arrangement. Tests were performed under 4, 6, 8 and 10 N load values, traveling speed of 1 m/s and abrasion surface roughness values of 5, 20 and 45 μm. Wear volume maps were obtained and the results showed that the lowest wear volume rate for PA is reached using glass bead filler. Furthermore, the results also showed that the higher is the applied load and the roughness of the abrasion surface, the higher is the wear rate. Finally it is also concluded that abrasive wear Process Mechanism include ploughing Mechanism and delimitation of filler tips.
Geoffroy Vallée - One of the best experts on this subject based on the ideXlab platform.
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Ghost Process: a Sound Basis to Implement Process Duplication, Migration and Checkpoint-Restart in Linux Clusters
2005Co-Authors: Geoffroy Vallée, Renaud Lottiaux, David Margery, Christine Morin, Jean-yves BerthouAbstract:Process management Mechanisms (Process duplication, migration and checkpoint-restart) are very useful for high performance and high availability in clustering systems. The single system image approach aims at providing a global Process management service with Mechanisms for Process checkpoint, Process migration and Process duplication. In this context, a common Mechanism for Process virtualization is highly desirable but traditional operating systems do not provide such a Mechanism. This paper presents a kernel service for Process virtualization called ghost Process, extending the Linux kernel. The ghost Process Mechanism has been implemented in the Kerrighed single system image based on Linux.
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Ghost Process: a Sound Basis to Implement Process Duplication, Migration and Checkpoint/Restart in Linux Clusters
2005Co-Authors: Geoffroy Vallée, Renaud Lottiaux, David Margery, Christine Morin, Jean-yves BerthouAbstract:Today, clusters are widely used to execute numerical applications. Mechanisms are needed to ease cluster use and to take advantage of the cluster distributed resources. Process management Mechanisms are very useful in this respect. Process duplication is needed for parallel application deployment, dynamic load balancing relies on Process migration and Process checkpoint/restart is needed to tolerate node failures during the execution of long-running applications. A kernel level approach allows to efficiently implement all these Mechanisms. However, they are very complex to implement and to maintain. Nevertheless they are all based on a common concept: Process virtualization which provides a mean to extract the state of a Process from the operating system executed on each cluster node. This paper presents a Process virtualization Mechanism called ghost Process, implemented at kernel level which can be used by system programmers to easily implement various Process management Mechanisms. The ghost Process Mechanism has been implemented in Kerrighed single system image cluster operating system based on Linux. It has been used to efficiently and easily implement Process duplication, migration and checkpoint/restart in Kerrighed.
Xi Chen - One of the best experts on this subject based on the ideXlab platform.
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contact fracture Mechanism of electroplated ni p coating upon stainless steel substrate
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013Co-Authors: Akio Yonezu, Michihiro Niwa, Xi ChenAbstract:Abstract The contact fracture property and Mechanism of electroplated Ni–P coating on stainless steel substrate were investigated using ball indentation testing, through a comprehensive experimental and numerical approach. First, the elastoplastic properties of both coating and substrate were evaluated using micro-indentation tests. Next, ball indentation test with large contact force was performed, such that the brittle coating on ductile substrate suffers from cracks, including ring crack (propagates circumferentially) and radial cracks (propagates radially), owing to the coating bending effect. The fracture nucleation Process was investigated using the acoustic emission technique (AET). In addition, finite element method (FEM) with cohesive zone model (CZM) was carried out to compute stress field and simulate crack initiation around the impression during the test. By using the comprehensive experimental/computational framework, the nucleation Process (Mechanism) of such a complicate crack system was clarified. The present technique and fracture Mechanism may be applicable to the analysis of structural integrity of other brittle coatings.
A. Mimaroglu - One of the best experts on this subject based on the ideXlab platform.
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Abrasive Wear Volume Maps for PA6 and PA6 Composites Under Dry Working Condition
Applied Composite Materials, 2008Co-Authors: A. Mimaroglu, H. UnalAbstract:In this study the wear volume map is obtained and considered for evaluation of the abrasive wear performance for polyamide (PA6) and PA6 composites. Polyamide composites were tailored using 25 wt.% glass bead, 20 wt.% talc and 30 wt.% wollastonite fillers. In this work, the influence of filler materials, abrasion surface roughness and applied loading values on abrasive wear performance of PA6 and PA6 composites were evaluated. Experimental abrasive wear tests were carried out at atmospheric condition using pin-on-disc rig arrangement. Tests were performed under 4, 6, 8 and 10 N load values, traveling speed of 1 m/s and abrasion surface roughness values of 5, 20 and 45 μm. Wear volume maps were obtained and the results showed that the lowest wear volume rate for PA is reached using glass bead filler. Furthermore, the results also showed that the higher is the applied load and the roughness of the abrasion surface, the higher is the wear rate. Finally it is also concluded that abrasive wear Process Mechanism include ploughing Mechanism and delimitation of filler tips.
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Abrasive Wear Volume Maps for PA6 and PA6 Composites Under Dry Working Condition
Applied Composite Materials, 2008Co-Authors: A. Mimaroglu, U. Sen, H. UnalAbstract:In this study the wear volume map is obtained and considered for evaluation of the abrasive wear performance for polyamide (PA6) and PA6 composites. Polyamide composites were tailored using 25 wt.% glass bead, 20 wt.% talc and 30 wt.% wollastonite fillers. In this work, the influence of filler materials, abrasion surface roughness and applied loading values on abrasive wear performance of PA6 and PA6 composites were evaluated. Experimental abrasive wear tests were carried out at atmospheric condition using pin-on-disc rig arrangement. Tests were performed under 4, 6, 8 and 10 N load values, traveling speed of 1 m/s and abrasion surface roughness values of 5, 20 and 45 μm. Wear volume maps were obtained and the results showed that the lowest wear volume rate for PA is reached using glass bead filler. Furthermore, the results also showed that the higher is the applied load and the roughness of the abrasion surface, the higher is the wear rate. Finally it is also concluded that abrasive wear Process Mechanism include ploughing Mechanism and delimitation of filler tips.
