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Resilience in Collaborative Optimization: Redundant and Independent Cost Functions [article]

Nirupam Gupta, Nitin H. Vaidya
2020 arXiv   pre-print
This report considers the problem of Byzantine fault-tolerance in multi-agent collaborative optimization. In this problem, each agent has a local cost function.  ...  Further, we also consider the case when the cost functions are independent or do not satisfy the minimal redundancy property.  ...  Acknowledgements Research reported in this paper was sponsored in part by the Army Research Laboratory under Cooperative Agreement W911NF-17-2-0196, and by National Science Foundation award 1842198.  ... 
arXiv:2003.09675v2 fatcat:fobpzqkt6zf2rl6bhdhbuf5isu

A Strategic Process to Manage Collaborative Risks in Supply Chain Networks (SCN) to Improve Resilience and Sustainability

Marco Nunes, António Abreu, Jelena Bagnjuk, Edgar Nunes, Célia Saraiva
2022 Sustainability  
In this work, a strategic process to identify and manage collaborative risks in SCNs to help improve resilience and sustainability is proposed.  ...  emergent collaborative risks in a quantitative way that potentially may threaten an organization's efficiency and performance, and thus negatively impact resilience and sustainability.  ...  In supply chain networks (SCN), the optimization processes are traditionally based on cost-competitiveness reasons, and very little is based on the improvement of the existing collaborative dimensions  ... 
doi:10.3390/su14095237 fatcat:ioyw4g5eczb2vprvwylhece25i

Collaborative Resilience to Episodic Shocks and Surprises: A Very Long-Term Case Study of Zanjera Irrigation in the Philippines 1979–2010

Ruth Yabes, Bruce Goldstein
2015 Social Sciences  
The Zanjera nimbly responded to these challenges, although sometimes in ways that left its structure and function substantially altered.  ...  A core contribution of this analysis is the integration of a CPR study within an SES framework to examine resilience, made possible the occurrence of a wide range of challenges to the Zanjera's function  ...  We are grateful to Zanjera San Marcelino's members and leaders for their extensive time in interviews, meetings, and field visits. Thank you to E.  ... 
doi:10.3390/socsci4030469 fatcat:72jbyqejx5atnedy5q25z3be7u

Approximate Byzantine Fault-Tolerance in Distributed Optimization [article]

Shuo Liu, Nirupam Gupta, Nitin H. Vaidya
2021 arXiv   pre-print
We obtain necessary and sufficient conditions for achieving (f,ϵ)-resilience characterizing the correlation between relaxation in redundancy and approximation in resilience.  ...  cost function.  ...  The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory  ... 
arXiv:2101.09337v4 fatcat:jlhclmf2ljhzvlaf6almnqdyri

A Survey on Fault-tolerance in Distributed Optimization and Machine Learning [article]

Shuo Liu
2021 arXiv   pre-print
With the rapid expansion of the scale of distributed systems, resilient distributed algorithms for optimization are needed, in order to mitigate system failures, communication issues, or even malicious  ...  This survey investigates the current state of fault-tolerance research in distributed optimization, and aims to provide an overview of the existing studies on both fault-tolerant distributed optimization  ...  Gupta and Vaidya [45, 46] studied a different type of redundancy in cost functions named 2f -redundancy, defined as follows: Definition 1 (2f -redundancy) The cost functions of a set of non-faulty agents  ... 
arXiv:2106.08545v2 fatcat:g6fys4icrbbr5k3bd3ycylaptu

Multihoming aware optimization mechanism

Bruno Sousa, Kostas Pentikousis, Marilia Curado
2015 2015 IFIP/IEEE International Symposium on Integrated Network Management (IM)  
Redundant and resilient connections to the ISO image files repositories are performed.  ...  Figure 4 . 4 : 44 Costs criteria tree resilience and ubiquity, as described in Chapter 2.  ...  The evaluation performed also included failures in the network, in order to assess the resilience gain of multimedia applications empowered by MCoA.  ... 
doi:10.1109/inm.2015.7140437 dblp:conf/im/SousaPC15 fatcat:mexhxgjbkvd3foptgzuqubwpuq

Dynamic virtual network restoration with optimal standby virtual router selection

Xuan Liu, Deep Medhi
2016 NOMS 2016 - 2016 IEEE/IFIP Network Operations and Management Symposium  
In the protection scheme, the substrate network provider (SNP) allocates redundant resources (e.g., nodes, paths, bandwidths, etc) to protect against potential failures in the VNE.  ...  for the Doctor of Philosophy degree, and certify that in their opinion it is worthy of acceptance.  ...  We use normalized cost overhead (i.e., cost overhead) to evaluate the gain of optimal solution, and it is represented by (heuristic cost)−(optimal cost) (optimal cost) .  ... 
doi:10.1109/noms.2016.7502935 dblp:conf/noms/LiuM16 fatcat:6w6whzel2ver5cy6zi5zcs5n5a

Data Encoding for Byzantine-Resilient Distributed Optimization [article]

Deepesh Data, Linqi Song, Suhas Diggavi
2020 arXiv   pre-print
We study distributed optimization in the presence of Byzantine adversaries, where both data and computation are distributed among m worker machines, t of which may be corrupt.  ...  The compromised nodes may collaboratively and arbitrarily deviate from their pre-specified programs, and a designated (master) node iteratively computes the model/parameter vector for generalized linear  ...  The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory  ... 
arXiv:1907.02664v2 fatcat:ctptgj7gpfelraygvetdxrpy4m

End-to-End Reliability and Optimization of Intra and Inter-Domain IMS-based Communication Networks

Chayapol Kamyod, Rasmus Hjorth Nielsen, Neeli Rashmi Prasad, Ramjee Prasad, Nattapol Aunsri
2017 Journal of Cyber Security and Mobility  
Thus, redundancy has high impact to an End-to-End Reliability and Optimization of Intra and Inter-Domain 247 Figure 7 End-to-end reliability results of intra and inter-domain communications. overall availability  ...  While, the percentage difference of the availability gap between intra and inter-communication of no redundancy case is ≈ 0.14% and the percentage difference of the gap in case of redundancy is ≈ 9 × 10  ...  He has more than ten years of R&D and business experience in industry and academia. He is the founder and partner of R&D intensive network planning  ... 
doi:10.13052/jcsm2245-1439.533 fatcat:baa7r6l4sjggpa5os2pkwftiae

How to Price Shared Optimizations in the Cloud [article]

Prasang Upadhyaya, Magdalena Balazinska, Dan Suciu
2012 arXiv   pre-print
Each optimization carries a cost and may benefit multiple users. This creates a major challenge: how to select which optimizations to perform and how to share their cost among users.  ...  Data-management-as-a-service systems are increasingly being used in collaborative settings, where multiple users access common datasets.  ...  function of optimization cost for different collaboration sizes.  ... 
arXiv:1203.0059v1 fatcat:32tezny55zehpmxzyz3wolke2u

How to price shared optimizations in the cloud

Prasang Upadhyaya, Magdalena Balazinska, Dan Suciu
2012 Proceedings of the VLDB Endowment  
Each optimization carries a cost and may benefit multiple users. This creates a major challenge: how to select which optimizations to perform and how to share their cost among users.  ...  Data-management-as-a-service systems are increasingly being used in collaborative settings, where multiple users access common datasets.  ...  function of optimization cost for different collaboration sizes.  ... 
doi:10.14778/2168651.2168657 fatcat:6e4ol6xtizakffiumnxcwyn2lm

Self-optimization of resilient topologies for fallible multi-robots

Marco Minelli, Jacopo Panerati, Marcel Kaufmann, Cinara Ghedini, Giovanni Beltrame, Lorenzo Sabattini
2020 Robotics and Autonomous Systems  
robots and the injection of permanent faults in the form of sudden, independently distributed hardware breakdowns.  ...  Feng and Hu [22] 100 studied connectivity-preserving rendez-vous accounting for battery levels and communication costs. Their proposed approach required to split the original task into sub-problems.  ...  However, 15 having a large number of robots per se does not imply redundancy (and thus resilience).  ... 
doi:10.1016/j.robot.2019.103384 fatcat:n3pr62adxzdank4nen52atyuku

Optimizing ex situ genetic resource collections for European livestock conservation

Rafael De Oliveira Silva, Bouda Vosough Ahmadi, Sipke Joost Hiemstra, Dominic Moran
2018 Journal of Animal Breeding and Genetics  
We also calculate marginal costs of collections and show that increasing diversity within the gene banks implies in higher costs per conserved breed.  ...  We developed a mathematical model to optimize logistical decisions of breed conservation choices and to evaluate alternative scenarios for efficiently re-allocating genetic materials currently stored in  ...  ACKNOWLEDGEMENTS We acknowledge the participating institutions that provided cost data for this work.  ... 
doi:10.1111/jbg.12368 pmid:30536957 pmcid:PMC7379547 fatcat:6d5qpbly3jdb7aznec2vnjbxrm

An Event-Based Supply Chain Partnership Integration Using a Hybrid Particle Swarm Optimization and Ant Colony Optimization Approach

Lu, Wang
2019 Applied Sciences  
(PSACO) with particle swarm optimization (PSO) and ant colony optimization (ACO) that aims to efficiently solve the problem.  ...  ACO, and can be served as a tool of decision making for supply chain coordination management in business.  ...  Objective functions were designed to identify the optimal supply chain solution that minimized the combined cost of operating the supply chain network along with the cost of processing information [11  ... 
doi:10.3390/app10010190 fatcat:wuammiivdbfshg2lmckdgnpwom

Comparing Low and High-Level Hybrid Algorithms on the Two-Objective Optimal Design of Water Distribution Systems

Qi Wang, Enrico Creaco, Marco Franchini, Dragan Savić, Zoran Kapelan
2014 Water resources management  
This paper presents the comparison of two hybrid methodologies for the two-objective (cost and resilience) design of water distribution systems.  ...  The second methodology is a high level hybrid algorithm (HLHA), in which various sub-algorithms collaborate in parallel.  ...  The final network configuration is assessed in terms of cost (Eq. 1) and network resilience (Eq. 2), which are the objective functions of A1.  ... 
doi:10.1007/s11269-014-0823-8 fatcat:q2vdvpm4pnfyjceaqcfy5ob4py
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