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Redundancy-d: The Power of d Choices for Redundancy

Kristen Gardner, Mor Harchol-Balter, Alan Scheller-Wolf, Mark Velednitsky, Samuel Zbarsky
2017 Operations Research  
Our system consists of k servers, each with its own queue. We introduce the Redundancy-d policy, under which each incoming job makes copies at a constant number of servers, d, chosen at random.  ...  of servers, as well as expressions for the distribution of response time which are exact as the number of servers approaches infinity.  ...  Power of d Choices In this section we study the effect of increasing d on response time under Redundancy-d.  ... 
doi:10.1287/opre.2016.1582 fatcat:ogdtiohkkrg7fieil44srses2i

The Power of d Choices for Redundancy

Kristen Gardner, Samuel Zbarsky, Mor Harchol-Balter, Alan Scheller-Wolf
2016 Proceedings of the 2016 ACM SIGMETRICS International Conference on Measurement and Modeling of Computer Science - SIGMETRICS '16  
We propose a theoretical model of redundancy, the Redundancy-d system, in which each job sends redundant copies to d servers chosen uniformly at random.  ...  An increasingly prevalent technique for improving response time in queueing systems is the use of redundancy.  ...  To find mean response time, we must first find Pr{m jobs in system} by summing over all k d possible choices of servers for each queue position.  ... 
doi:10.1145/2896377.2901497 dblp:conf/sigmetrics/GardnerZHS16 fatcat:datn3lysn5finghoubtonsfrpa

The Power of d Choices for Redundancy

Kristen Gardner, Samuel Zbarsky, Mor Harchol-Balter, Alan Scheller-Wolf
2016 Performance Evaluation Review  
We propose a theoretical model of redundancy, the Redundancy-d system, in which each job sends redundant copies to d servers chosen uniformly at random.  ...  An increasingly prevalent technique for improving response time in queueing systems is the use of redundancy.  ...  To find mean response time, we must first find Pr{m jobs in system} by summing over all k d possible choices of servers for each queue position.  ... 
doi:10.1145/2964791.2901497 fatcat:pstr7ka5wjbnzjz7tymlzxx4tm

On the Exploitation of the Redundant Energy in UW-OFDM: LMMSE Versus Sphere Detection

Mario Huemer, Christian Hofbauer, Alexander Onic, Johannes B. Huber
2012 IEEE Signal Processing Letters  
Originally, the code generator matrix of systematic coded UW-OFDM had been designed rather intuitively by minimizing the mean redundant energy.  ...  We study and interpret the estimators' performance and their diverse ability to exploit the redundant energy.  ...  The optimized mean power values of the redundant subcarrier symbols are the elements of the vector σ 2 d diag TT H evaluated for the optimum P, cf. (13).  ... 
doi:10.1109/lsp.2012.2194737 fatcat:jgh3ecikfvcjvfv3dc2ko7f6zi

Complex number RS coded OFDM with systematic noise in the guard interval

Mario Huemer, Christian Hofbauer, Johannes B. Huber
2010 2010 Conference Record of the Forty Fourth Asilomar Conference on Signals, Systems and Computers  
In this paper we introduce a method that significantly reduces the energy of the redundant subcarrier symbols by allowing some systematic noise in the UWs.  ...  The UWs are generated by appropriately loading so-called redundant subcarriers.  ...  The mean power for the data subcarrier symbols is σ 2 d = 1, while the optimized mean power values of the redundant subcarrier symbols are the elements of the vector σ 2 d diag TT H evaluated for the optimum  ... 
doi:10.1109/acssc.2010.5757556 fatcat:fsdkoscgw5b3thpewm4zydzap4

Reliability, Efficiency and Cost Trade-offs for Medium Voltage Distribution Network Expansion using Refurbished AC-DC Reconfigurable Links

Aditya Shekhar, Laura Ramirez-Elizondo, Pavol Bauer
2018 2018 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM)  
The role of MVDC links for distribution network expansion is important.  ...  The object of this paper is to present a discussion on the emerging choices involved in adopting a parallel ac-dc reconfigurable link architecture in designing future and flexible power grids.  ...  Different choices for essential components of each block results in different implications for the reliability, efficiency and cost of the distribution system.  ... 
doi:10.1109/speedam.2018.8445361 fatcat:xbr4bnhfcjdapf7mpipwqmmdry

Message Passing for Integrating and Assessing Renewable Generation in a Redundant Power Grid

Lenka Zdeborova, Scott Backhaus, Michael Chertkov
2010 2010 43rd Hawaii International Conference on System Sciences  
We explore the capacity of the renewable generation by determining the level of "firm" generation capacity that can be displaced for different levels of redundancy R.  ...  A simplified model of a redundant power grid is used to study integration of fluctuating renewable generation. The grid consists of large number of generator and consumer nodes.  ...  Model choice criteria (in physics): The simpler and richer the better.  ... 
doi:10.1109/hicss.2010.272 dblp:conf/hicss/ZdeborovaBC10 fatcat:736gw7hmqfbwxfbp5ej3fqsipe

Chaos-based random number generators. Part II: practical realization

T. Stojanovski, J. Pihl, L. Kocarev
2001 IEEE Transactions on Circuits and Systems I Fundamental Theory and Applications  
Post-layout circuit simulations of the RNG indicate no periodic attractors over variations in temperature, power supply and process conditions, and maximum redundancy of 0.4%.  ...  In Part I, we have mathematically analyzed the information generation process of a class of PL1D maps.  ...  Optimum Choice of Parameters What is the optimum choice of parameters? How can we exploit results from this subsection to find the optimum choice?  ... 
doi:10.1109/81.915396 fatcat:e4leglu6gvdn5jlibosckoro4y

Reliability analysis of transmission requirements in communication satellite systems

Marina Ruggieri, Corradino Corradi
1996 Journal of Spacecraft and Rockets  
Stand-by redundancy of the on-board power section (N, active and r redundant amplifiers).  ...  RUGGIERI AND CORRADI EIRP REQUIREMENT (— CHOICE OF \ AND RF POWER DISTRIBUTION AMONG ACTIVE AMPLIFIERS va CHOICE OF DEVICE POLARIZATION CLASS AND AMPLIFIER CONFIGURATION L ® af RFd EVALUATION OF POWER  ... 
doi:10.2514/3.26849 fatcat:5bnedoynqfenrpqf54b5noc4qu

Multi-description multipath video streaming in wireless ad hoc networks

Yuanyuan Xu, Ce Zhu
2012 Signal processing. Image communication  
bandwidth and optimally selects the amount of inserted redundancy according to different loss rates.  ...  The second problem touches on unbalanced-path based joint MD video coding and packet allocation for multiple paths of varying bandwidth and loss probabilities.  ...  For simplicity, we consider the case of using the same transmitting power P for all the nodes in the wireless network.  ... 
doi:10.1016/j.image.2012.01.008 fatcat:3ft55xnkvzdgxajk2kuobb6aey

Quantitative Evaluation of DC Microgrids Availability: Effects of System Architecture and Converter Topology Design Choices

Alexis Kwasinski
2011 IEEE transactions on power electronics  
Marginal availability differences are observed for different circuit topology choices, although architectures with MICs are more sensitive to this choice.  ...  MICs and, in particular, the ISEPIC, are identified as good compromise options for dc microgrids source interfaces.  ...  ACKNOWLEDGMENT Circuit analysis for the ISEPIC was performed by Mr. R. Zhao and experimental work for the ISEPIC was done by Mr. S.-Y. Yu.  ... 
doi:10.1109/tpel.2010.2102774 fatcat:zpxg7jgezjgsrp6p3uqw37bbmq

Row/column redundancy to reduce SRAM leakage in presence of random within-die delay variation

Maziar Goudarzi, Tohru Ishihara
2008 Proceeding of the thirteenth international symposium on Low power electronics and design - ISLPED '08  
On a commercial 90nm process assuming 3% variation in SRAM cell delay, we obtained 47% leakage reduction by adding only 5 redundant columns at negligible area, dynamic power and delay costs.  ...  We show that due to within-die delay variation of SRAM cells only a few cells violate target timing at higher V th or T ox ; we carefully choose the V th and T ox values such that the original memory timing-yield  ...  We use these choices for optimization.  ... 
doi:10.1145/1393921.1393947 dblp:conf/islped/GoudarziI08 fatcat:2u6jjmpgu5afneenlz5sliadxa

Showing that the race model inequality is not violated

Matthias Gondan, Verena Riehl, Steven P. Blurton
2011 Behavior Research Methods  
The critical aspect is that the same speeded response is required for both A and V-for example, a simple manual response or a given choice.  ...  processing time D AV is then determined by the faster of the two channels: D AV = min (D A , D V ).  ...  However, especially for strict noninferiority margins, the power to detect that the race model inequality holds is rather low, with lowest power at the boundary of the maximally possible redundancy gain  ... 
doi:10.3758/s13428-011-0147-z pmid:21858603 fatcat:tr4jqrx6nvhenngejrcaob6cei

Extended operation of flying capacitor multilevel inverters

Jing Huang, K.A. Corzine
2006 IEEE transactions on power electronics  
For the three-cell FCMI, four levels of operation are expected if the traditional ratio of the capacitor voltages is 1:2:3.  ...  It is shown that the four-and fivelevel cases are suitable for motor drive operation and can maintain capacitor voltage balance under a wide range of power factors and modulation indices.  ...  The multilevel modulator determines desired levels for each phase then all joint redundant states and per-phase sub-choices are considered.  ... 
doi:10.1109/tpel.2005.861108 fatcat:dif3u75yvre2zpvcvjdm3hsdja

PLDAD—An Algorihm to Reduce Data Center Energy Consumption

Joao Ferreira, Gustavo Callou, Dietmar Tutsch, Paulo Maciel
2018 Energies  
The present paper proposes a power balancing algorithm (power load distribution algorithm-depth (PLDA-D)) to optimize the energy distribution of data center electrical infrastructures.  ...  EFM computes the power efficiency, sustainability and cost metrics of data center infrastructures.  ...  P.M. encouraged J.F. to investigate maximum and minimum flow and to propose a new solution to data centers' electrical power. P.M. and D.T. supervised and revised the findings of this work.  ... 
doi:10.3390/en11102821 fatcat:sd32u72vyfhwjefx3i6tmaer3y
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