Selecting the Condorcet Winner: single-stage versus multi-stage voting rules

Public Choice ◽  
2008 ◽  
Vol 137 (1-2) ◽  
pp. 207-220 ◽  
Author(s):  
Michael Peress
Keyword(s):  
Condorcet Winner ◽  
Single Stage ◽  
Stage Versus ◽  
Voting Rules ◽  
Multi Stage

scholarly journals Single-stage versus multi-stage pull-through for Hirschsprung's disease: Practice trends and outcomes in infants

2014 ◽  
Vol 49 (11) ◽  
pp. 1619-1625 ◽  
Author(s):  
Jason P. Sulkowski ◽  
Jennifer N. Cooper ◽  
Anthony Congeni ◽  
Erik G. Pearson ◽  
Benedict C. Nwomeh ◽  
...  
Keyword(s):  
Hirschsprung's Disease ◽  
Hirschsprung’S Disease ◽  
Single Stage ◽  
Stage Versus ◽  
Multi Stage ◽  
Pull Through

Downstream processing of antibodies: Single-stage versus multi-stage aqueous two-phase extraction

2009 ◽  
Vol 1216 (50) ◽  
pp. 8741-8749 ◽  
Author(s):  
P.A.J. Rosa ◽  
A.M. Azevedo ◽  
I.F. Ferreira ◽  
S. Sommerfeld ◽  
W. Bäcker ◽  
...  
Keyword(s):  
Downstream Processing ◽  
Single Stage ◽  
Phase Extraction ◽  
Stage Versus ◽  
Two Phase ◽  
Multi Stage ◽  
Aqueous Two Phase Extraction

scholarly journals Extraction of tetracycline using the ionic liquid-based aqueous two phase systems: Single-stage versus multi-stage

2018 ◽  
Vol 24 (4) ◽  
pp. 387-397 ◽  
Author(s):  
Yi Liu ◽  
Li Chen ◽  
Jun Zhou ◽  
Zongcheng Yan
Keyword(s):  
Extraction Efficiency ◽  
Ph Value ◽  
Influence Factors ◽  
Volume Ratio ◽  
Line Length ◽  
Single Stage ◽  
Two Phase ◽  
Extraction Behavior ◽  
Multi Stage ◽  
Tie Line

Ionic liquids-based aqueous two-phase extraction (ILs-ATPE) offers an alternative approach to the extraction of tetracycline (TC) through their partitioning between two phases. Single-stage and multi-stage strategies have been evaluated and compared for the purification of TC using ATPE composed of 1-butyl-3-methylimidazolium halide ([Bmim]X(X=Cl,Br)) and K2HPO4. The influence factors on single-stage extraction behavior of TC were optimized systematically, including the pH value, tie line length, and volume ratio. The optimal extraction efficiency of TC could reach above 95% when the volume ratio is higher than 1.5 and the tie line length is 30.52%. The multi-stage ATPE was also investigated by simulating a three-stage crosscurrent operation in test tubes. According to the TC isotherm curve and respective McCabe?Thiele diagrams, a predicted optimized scheme of the countercurrent multi-stage ATPE was determined. TC can be purified in the IL-rich top phase with a final extraction efficiency of 99% and a final TC concentration of 0.25 mg/mL, if a three- -stage [Bmim]Cl-K2HPO4 ATPE with volume ratio of 0.5 and tie line length of 30.52% was employed. Thus, the multi-stage extraction with small volume ratio is necessary to achieve a higher recovery yield, resulting in the reduction of the IL consumption.

Mean Sojourn Time in Multi Stage Fork-Join Network

2015 ◽  
Vol 6 (3) ◽  
pp. 80-99 ◽  
Author(s):  
Yonit Barron
Keyword(s):  
Supply Chains ◽  
Sojourn Time ◽  
Computer Processing ◽  
Single Stage ◽  
Assembly Systems ◽  
Parallel Tasks ◽  
Multi Stage ◽  
Stage System ◽  
Major Factors ◽  
Performance Behavior

Fork-Join queue networks (F-J) have received increasing attention during the last Decade, due to their ability to model parallel and distributed computer processing, supply chains and assembly systems. However, most research is focused on a single stage processing, and only scant work exists on F-J with two or more stages. In this paper, the author investigates (through simulation) the performance behavior of a multi-stage system; in particular, the performance of a synchronized system is compared to an unsynchronized system regarding three major factors: (1) the number of parallel tasks; (2) the number of serial stages and (3) the utilization.

scholarly journals Practical Algorithms for Multi-Stage Voting Rules with Parallel Universes Tiebreaking

2019 ◽  
Vol 33 ◽  
pp. 2189-2196 ◽  
Author(s):  
Jun Wang ◽  
Sujoy Sikdar ◽  
Tyler Shepherd ◽  
Zhibing Zhao ◽  
Chunheng Jiang ◽  
...  
Keyword(s):  
Machine Learning ◽  
Decision Making ◽  
Group Decision Making ◽  
Group Decision ◽  
Search Algorithms ◽  
Voting Rules ◽  
Practical Algorithms ◽  
Multi Stage ◽  
Parallel Universes ◽  
Np Complete

STV and ranked pairs (RP) are two well-studied voting rules for group decision-making. They proceed in multiple rounds, and are affected by how ties are broken in each round. However, the literature is surprisingly vague about how ties should be broken. We propose the first algorithms for computing the set of alternatives that are winners under some tiebreaking mechanism under STV and RP, which is also known as parallel-universes tiebreaking (PUT). Unfortunately, PUT-winners are NP-complete to compute under STV and RP, and standard search algorithms from AI do not apply. We propose multiple DFS-based algorithms along with pruning strategies, heuristics, sampling and machine learning to prioritize search direction to significantly improve the performance. We also propose novel ILP formulations for PUT-winners under STV and RP, respectively. Experiments on synthetic and realworld data show that our algorithms are overall faster than ILP.

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