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1,151 results on '"Schiper, A."'

1. IMPLEMENTATION OF OTTAWA ANKLE RULES IN UNIVERSITY HOSPITAL EMERGENCY ROOM: PILOT STUDY

Author

SACHA PUGLIESE SCHIPER, HUGO MAIA RODRIGUES, JOÃO EDUARDO LIMA ERNESTO REIS, MAYARA BRANCO E SILVA, MAURO DINATO, and RODRIGO GONÇALVES PAGNANO

Subjects
Ankle Sprain, Ankle Fractures, Ankle, Radiography, Medicine, Orthopedic surgery, RD701-811
Abstract

ABSTRACT Ankle injuries are the most common musculoskeletal injuries in emergency rooms and are associated with a great social and economic impact. The need to request additional tests for ankle sprains is based on suspicion of fracture. The Ottawa Ankle Rules (OAR) establish criteria for ordering radiographs to avoid performing unnecessary examinations. Objective: To evaluate the implementation of the Ottawa Rules as a protocol for treating ankle sprains in the emergency department of a university hospital. Methods: This is a retrospective observational study, conducted over a period of three months before and three months after implementation of the protocol. Results: In the first phase, all patients complaining of ankle sprain underwent radiographs. In the second phase, after the application of the OAR, out of 85 patients evaluated, only 58 underwent complementary exams, showing a reduction of 31.8% in the request for imaging exams. There was no significant difference in fracture detection between the two groups (p=0.476). Conclusion: The OAR can be used as a tool in diagnosing ankle sprains, and their implementation reduced the request for imaging exams. Level of Evidence III, Retrospective Comparative Study.

Published
2023
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2. Ring Paxos: High-Throughput Atomic Broadcast

Author

Marandi, Parisa Jalili, Primi, Marco, Schiper, Nicolas, and Pedone, Fernando

Subjects
Computer Science - Distributed, Parallel, and Cluster Computing
Abstract

Atomic broadcast is an important communication primitive often used to implement state-machine replication. Despite the large number of atomic broadcast algorithms proposed in the literature, few papers have discussed how to turn these algorithms into efficient executable protocols. This paper focuses on a class of atomic broadcast algorithms based on Paxos, with its corresponding desirable properties: safety under asynchrony assumptions, liveness under weak synchrony assumptions, and resiliency-optimality. The paper presents two protocols, M-Ring Paxos and U-Ring Paxos, derived from Paxos. The protocols inherit the properties of Paxos and can be implemented very efficiently. We report a detailed performance analysis of M-Ring Paxos and U-Ring Paxos and compare them to other atomic broadcast protocols.

Published
2014

3. Vive la Diff\'erence: Paxos vs. Viewstamped Replication vs. Zab

Author

Van Renesse, Robbert, Schiper, Nicolas, and Schneider, Fred B.

Subjects
Computer Science - Distributed, Parallel, and Cluster Computing
Abstract

Paxos, Viewstamped Replication, and Zab are replication protocols that ensure high-availability in asynchronous environments with crash failures. Various claims have been made about similarities and differences between these protocols. But how does one determine whether two protocols are the same, and if not, how significant the differences are? We propose to address these questions using refinement mappings, where protocols are expressed as succinct specifications that are progressively refined to executable implementations. Doing so enables a principled understanding of the correctness of the different design decisions that went into implementing the various protocols. Additionally, it allowed us to identify key differences that have a significant impact on performance., Comment: 16 pages

Published
2013

12. Modular Approach to Replication for Availability

Author

Pedone, Fernando, Schiper, André, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Charron-Bost, Bernadette, editor, Pedone, Fernando, editor, and Schiper, André, editor

Published
2010
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13. From Object Replication to Database Replication

Author

Pedone, Fernando, Schiper, André, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Charron-Bost, Bernadette, editor, Pedone, Fernando, editor, and Schiper, André, editor

Published
2010
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18. High-Throughput Maps on Message-Passing Manycore Architectures: Partitioning versus Replication

Author

Shahmirzadi, Omid, Ropars, Thomas, Schiper, André, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Kobsa, Alfred, Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Silva, Fernando, editor, Dutra, Inês, editor, and Santos Costa, Vítor, editor

Published
2014
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19. Advances in the Design and Implementation of Group Communication Middleware

Author

Bünzli, Daniel, Fuzzati, Rachele, Mena, Sergio, Nestmann, Uwe, Rütti, Olivier, Schiper, André, Wojciechowski, Paweł T., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Kohlas, Jürg, editor, Meyer, Bertrand, editor, and Schiper, André, editor

Published
2006
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20. Dependable Systems

Author

Schiper, André, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Kohlas, Jürg, editor, Meyer, Bertrand, editor, and Schiper, André, editor

Published
2006
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29. Addressing the ZooKeeper Synchronization Inefficiency

Author

Kalantari, Babak, Schiper, André, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Frey, Davide, editor, Raynal, Michel, editor, Sarkar, Saswati, editor, Shyamasundar, Rudrapatna K., editor, and Sinha, Prasun, editor

Published
2013
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37. Byzantine Chain Replication

Author

van Renesse, Robbert, Ho, Chi, Schiper, Nicolas, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Baldoni, Roberto, editor, Flocchini, Paola, editor, and Binoy, Ravindran, editor

Published
2012
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38. Tuning Paxos for High-Throughput with Batching and Pipelining

Author

Santos, Nuno, Schiper, André, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Bononi, Luciano, editor, Datta, Ajoy K., editor, Devismes, Stéphane, editor, and Misra, Archan, editor

Published
2012
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44. Byzantine Fault-Tolerance with Commutative Commands

Author

Raykov, Pavel, Schiper, Nicolas, Pedone, Fernando, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Fernàndez Anta, Antonio, editor, Lipari, Giuseppe, editor, and Roy, Matthieu, editor

Published
2011
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45. Structured Derivation of Semi-Synchronous Algorithms

Author

Attiya, Hagit, Borran, Fatemeh, Hutle, Martin, Milosevic, Zarko, Schiper, André, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, and Peleg, David, editor

Published
2011
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