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Strengthened Lazy Heaps: Surpassing the Lower Bounds for Binary Heaps [article]

Stefan Edelkamp, Jyrki Katajainen, Amr Elmasry
2014 arXiv   pre-print
In particular, these bounds for both insert and extract-min -and the time bound for insert- surpass the corresponding lower bounds known for binary heaps, though our data structure is similar.  ...  To surpass the lower bound for insert, we buffer insertions and allow O(^2 n) nodes to violate heap order in relation to their parents.  ...  It is interesting that we could surpass the two lower bounds known for binary heaps [13] by slightly loosening the assumptions that are intrinsic to these lower bounds.  ... 
arXiv:1407.3377v1 fatcat:qjfb7kv7cbhq7dcrh2dosfqt6m

Optimizing Binary Heaps

Stefan Edelkamp, Amr Elmasry, Jyrki Katajainen
2017 Theory of Computing Systems  
These efficiencies surpass lower bounds known for binary heaps, thereby resolving a long-standing theoretical debate.  ...  In particular, for the standard implementation of binary heaps, insert and extract-min operate in logarithmic time while involving at most lg n and 2 lg n [could possibly be reduced to lg lg n + O(1) and  ...  Although, compared to a binary heap, we surpass the comparison bound for extract-min and the time bound for insert [27] , our data structure is similar to a binary heap.  ... 
doi:10.1007/s00224-017-9760-2 fatcat:ditlvwyqezddvhwzh7cly6azvm

Soft Sequence Heaps [article]

Gerth Stølting Brodal
2020 arXiv   pre-print
It is based on ternary trees instead of binary trees and matches the time bounds of Kaplan et al., i.e. amortized O(1) insertions and amortized O((1/ϵ)) extract-min.  ...  The main contribution of this paper is an alternative soft heap implementation based on merging sorted sequences, with time bounds matching those of Chazelle's soft heaps.  ...  Introduction Chazelle in 1998 [6] introduced the soft heap as a heap data structure surpassing the comparison lower bounds of heaps by allowing the controlled corruptions of keys, i.e. artificially increasing  ... 
arXiv:2008.05398v1 fatcat:4yw6tcdeibd5hbobcaeqclbgea

An experimental evaluation and analysis of database cracking

Felix Martin Schuhknecht, Alekh Jindal, Jens Dittrich
2015 The VLDB journal  
Several works have proposed different cracking techniques for different aspects including updates, tuple-reconstruction, convergence, concurrency control, and robustness.  ...  Our 2014 VLDB paper "The Uncracked Pieces in Database Cracking" 1 was the first comparative study of these different methods by an independent group.  ...  Buffered crack-in-two collects the swap pairs in two heaps: a max-heap for values that should go to the upper partition and a min-heap for values that should go to the lower partition.  ... 
doi:10.1007/s00778-015-0397-y fatcat:ooqhsy54bvhktbycv7lvn4eftu

Optimizing Compilation and Computational Complexity of Constraint Handling Rules [chapter]

Jon Sneyers
2009 Lecture Notes in Computer Science  
Originally designed in the early 1990s as a specialpurpose programming language for adding user-defined constraint solvers to a host language, CHR has evolved over the last decade into a powerful and elegant  ...  In the second part, we improve the state of the art by proposing and implementing several compiler optimizations.  ...  Whether this lower bound can be achieved is not clear.  ... 
doi:10.1007/978-3-642-02846-5_41 fatcat:ywwhwcnysbea3alkxbrz7ppfxe

Comprehensive formal verification of an OS microkernel

Gerwin Klein, June Andronick, Kevin Elphinstone, Toby Murray, Thomas Sewell, Rafal Kolanski, Gernot Heiser
2014 ACM Transactions on Computer Systems  
worst-case execution time analysis of the binary, and an automatic initialiser for user-level systems that connects kernel-level access-control enforcement with reasoning about system behaviour.  ...  verified IPC fastpath, a proof that the binary code of the kernel correctly implements the C semantics, a proof of correct access-control enforcement, a proof of information-flow noninterference, a sound  ...  ACKNOWLEDGMENTS We would like to acknowledge the contribution of the following people in the different parts of this work, spanning multiple years and projects.  ... 
doi:10.1145/2560537 fatcat:wgaqjtqacfen3nd2apj4z4eldm


Gerwin Klein, Michael Norrish, Thomas Sewell, Harvey Tuch, Simon Winwood, Kevin Elphinstone, Gernot Heiser, June Andronick, David Cock, Philip Derrin, Dhammika Elkaduwe, Kai Engelhardt (+1 others)
2009 Proceedings of the ACM SIGOPS 22nd symposium on Operating systems principles - SOSP '09  
We present our experience in performing the formal, machine-checked verification of the seL4 microkernel from an abstract specification down to its C implementation.  ...  Complete formal verification is the only known way to guarantee that a system is free of programming errors.  ...  Acknowledgements We thank Timothy Bourke, Timothy Roscoe, and Adam Wiggins for valued feedback on drafts of this article.  ... 
doi:10.1145/1629575.1629596 dblp:conf/sosp/KleinEHACDEEKNSTW09 fatcat:cidf7z4awnhyfljpznijerhee4

Townsend_columbia_0054D_15370.pdf [article]

HLS tools typically provide imperative, side-e ectful languages to the designer, which makes it di cult to correctly specify and optimize complex, memory-bound applications.  ...  Compiling Irregular Software to Specialized Hardware Richard Townsend High-level synthesis (HLS) has simpli ed the design process for energy-e cient hardware accelerators: a designer speci es an accelerator's  ...  calls, surpassing a limit imposed by the compiler.  ... 
doi:10.7916/d8-0sqy-pv45 fatcat:stqkdihs2zhbpj25slwdmdap2y

Deductive Verification of Safety-Critical Java Programs

Christian Engel
A focus is put on the formalization of the RTSJ memory model in dynamic logic, the utilization of a region-based memory model for ensuring non-interference and a design-by-contract based approach for the  ...  This work investigates the application of deductive verification techniques to safety critical Java programs, in particular RTSJ programs.  ...  in φ[n]) resulting in a new upper/lower bound of the form ±n + c ± 1.  ... 
doi:10.5445/ir/1000014087 fatcat:b4jmjvi3ljaylmmn5rdrm6kkju

Closing the circle of algorithmic and system-centric database optimization : a comprehensive survey on adaptive indexing, data partitioning, and the rewiring of virtual memory [article]

Felix Martin Schuhknecht, Universität Des Saarlandes, Universität Des Saarlandes
Over the decades, with the increase of computing resources, the amount of data to manage also increased tremendously.  ...  Thus, in the first part of this thesis, we will reinvestigate, analyze, and enhance the class of adaptive indexing methods in a comprehensive evaluation on the algorithmic level.  ...  Buffered crack-in-two collects the swap pairs in two heaps: a max-heap for values that should go to the upper partition and a min-heap for values that should go to the lower partition.  ... 
doi:10.22028/d291-26682 fatcat:ws2rov2lwzefzfopv6edncr66m

At Zero Point: Discourse, Culture, and Satire in Restoration England

Paulette Scott, Rose A. Zimbardo
1999 Rocky Mountain Review of Language and Literature (RMMLA)  
and money is the exact inverse of the hero's-as the new binary model for satire demands.  ...  Miller, 48 would have it, for paradoxical encomium entals no more than a simple binary inversion.  ... 
doi:10.2307/1347966 fatcat:gr7i3pzjvjc4hgmqncm3rvyw2e

Dagstuhl Reports, Volume 4, Issue 11, November 2014, Complete Issue [article]

), focussing on techniques for proving tight runtime lower bounds under ETH.  ...  Transitive Reduction for Inference of Biological Networks on GPUs Last but not least, we will look at the latest developments of Fibonacci heaps, comparing enhanced lazy Fibonacci heaps that apply naive  ...  Allowing a limited number of heap violating nodes and by strengthening the heap condition in bottom trees this construction bypasses a well-known bound for heaps.  ... 
doi:10.4230/dagrep.4.11 fatcat:zzps76cx7rfldla5z5dikvsqbe

Asian Social Science, Vol. 4, No. 8, August, 2008

Editor ASS
2009 Asian Social Science  
Cognitive Perspective 102 Abstract Human capital information which is vital for effective management of resources is usually only accessible internally within an organization.  ...  This paper examines the extent of the disclosure of human capital in the annual reports of Malaysian top companies based on the concept of Human Resource Costing and Accounting (HRCA) and other relevant  ...  The result of the study could provide an insight into the Malaysian construction project development and will hopefully provide valuable guidelines, especially to public or private sectors in Malaysia.  ... 
doi:10.5539/ass.v4n8p0 fatcat:rb4c3wjaszb2pavwg7kotfxjpy

Gender Ambivalence in John Keats's Lamia, Isabella, and The Eve of St. Agnes

Ελένη Ιωάννη Ακανθοπούλου
Agnes (1820) Keats expresses a pioneering gender ambivalence through underlying, but perceptible, attacks on social conventions, and prejudices that constrict people by shaping and reinforcing binary perceptions  ...  John Keats's theories of Negative Capability and the chameleonic poetical character are the foundations of his poetry.  ...  The believers, like Madeline, the Beadsman and Angela, are bound to an illusory reality that has been set out for them by the authority of the Church.  ... 
doi:10.26262/ fatcat:rlfoajbtdzccncdwfr6clbyhqu

Correspondents Theory 1800/2000: Philosophical Reflections Upon Epistolary Technics And Praxis In The Analogue And Digital

Anthony John Charles Ross, Moss Michael, Susan Stuart
2015 Zenodo  
(whether optimistic or pessimistic) for the ways in which the Internet effects change in culture, society and self.  ...  The thesis is structured thematically, with chapters examining the experience of distance and presence in these two periods, the potential for meaningful engagements by way of communicative media, the  ...  which surpasses all signs.  ... 
doi:10.5281/zenodo.13889 fatcat:mzjqiccd55cmvj7yvm67wzvnlm
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