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Extractors for Additive Structures and Space-bounded Computation
Extractors for Additive Structures and Space-bounded Computation
Extractors for Additive Structures and Space-bounded Computation

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20250211151331
ISBN  
9798382841045
DDC  
004
저자명  
Liao, Jyun-Jie.
서명/저자  
Extractors for Additive Structures and Space-bounded Computation
발행사항  
[Sl] : Cornell University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
223 p
주기사항  
Source: Dissertations Abstracts International, Volume: 85-12, Section: B.
주기사항  
Advisor: Chattopadhyay, Eshan.
학위논문주기  
Thesis (Ph.D.)--Cornell University, 2024.
초록/해제  
요약Randomness is a powerful resource in computer science, with rich applications in algorithm design, cryptography, distributed computing, etc. Most of the applications assume access to a sequence of uniform and independent random bits. However, the randomness we collect from nature (e.g., activity of CPU, atmospheric noise, radioactive decay) does not seem as perfect. This motivates the study of randomness extractors, which are deterministic algorithms that can convert an imperfect random source (with some entropy) into a uniform random string. The ultimate goal in the area of randomness extraction is to construct an extractor that can work for any source that we would ever see in nature and applications. Unfortunately, a folklore result shows that it is impossible to construct an extractor that can work for every source that has entropy. It is therefore necessary to assume that the given source has certain structure, but we still hope that the structure we assume is as general as possible. In this thesis, we first focus on the construction of randomness extractors for sources with additive structure. This includes affine sources, which are uniform distributions over affine subspaces; and more generally the sum of two independent sources, which is a surprisingly general model that contains many other natural sources such as independent sources, affine sources and sources samplable by space-bounded computation. For both models, we construct extractors that improve the previous state-of-the-art, and develop many useful tools along the way. In addition, we discover new connections between sources with additive structure and space-bounded computation, and as a result we obtain extractors for small-space sources with optimal entropy requirement, and a new lower bound for linear branching programs. Finally, we develop more results regarding randomness and space-bounded computation, including new weighted pseudorandom generators and derandomization bounds for small-space algorithms.
일반주제명  
Computer science
일반주제명  
Computer engineering
일반주제명  
Applied mathematics
키워드  
Derandomization
키워드  
Pseudorandom generator
키워드  
Randomness extractor
키워드  
Space-bounded computation
키워드  
Sumset extractors
기타저자  
Cornell University Computer Science
기본자료저록  
Dissertations Abstracts International. 85-12B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■1001  ▼aLiao,  Jyun-Jie.▼0(orcid)0000-0003-3332-1460
■24510▼aExtractors  for  Additive  Structures  and  Space-bounded  Computation
■260    ▼a[Sl]▼bCornell  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a223  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-12,  Section:  B.
■500    ▼aAdvisor:  Chattopadhyay,  Eshan.
■5021  ▼aThesis  (Ph.D.)--Cornell  University,  2024.
■520    ▼aRandomness  is  a  powerful  resource  in  computer  science,  with  rich  applications  in  algorithm  design,  cryptography,  distributed  computing,  etc.  Most  of  the  applications  assume  access  to  a  sequence  of  uniform  and  independent  random  bits.  However,  the  randomness  we  collect  from  nature  (e.g.,  activity  of  CPU,  atmospheric  noise,  radioactive  decay)  does  not  seem  as  perfect.  This  motivates  the  study  of  randomness  extractors,  which  are  deterministic  algorithms  that  can  convert  an  imperfect  random  source  (with  some  entropy)  into  a  uniform  random  string.  The  ultimate  goal  in  the  area  of  randomness  extraction  is  to  construct  an  extractor  that  can  work  for  any  source  that  we  would  ever  see  in  nature  and  applications.  Unfortunately,  a  folklore  result  shows  that  it  is  impossible  to  construct  an  extractor  that  can  work  for  every  source  that  has  entropy.  It  is  therefore  necessary  to  assume  that  the  given  source  has  certain  structure,  but  we  still  hope  that  the  structure  we  assume  is  as  general  as  possible.  In  this  thesis,  we  first  focus  on  the  construction  of  randomness  extractors  for  sources  with  additive  structure.  This  includes  affine  sources,  which  are  uniform  distributions  over  affine  subspaces;  and  more  generally  the  sum  of  two  independent  sources,  which  is  a  surprisingly  general  model  that  contains  many  other  natural  sources  such  as  independent  sources,  affine  sources  and  sources  samplable  by  space-bounded  computation.  For  both  models,  we  construct  extractors  that  improve  the  previous  state-of-the-art,  and  develop  many  useful  tools  along  the  way.  In  addition,  we  discover  new  connections  between  sources  with  additive  structure  and  space-bounded  computation,  and  as  a  result  we  obtain  extractors  for  small-space  sources  with  optimal  entropy  requirement,  and  a  new  lower  bound  for  linear  branching  programs.  Finally,  we  develop  more  results  regarding  randomness  and  space-bounded  computation,  including  new  weighted  pseudorandom  generators  and  derandomization  bounds  for  small-space  algorithms.
■590    ▼aSchool  code:  0058.
■650  4▼aComputer  science
■650  4▼aComputer  engineering
■650  4▼aApplied  mathematics
■653    ▼aDerandomization
■653    ▼aPseudorandom  generator
■653    ▼aRandomness  extractor
■653    ▼aSpace-bounded  computation
■653    ▼aSumset  extractors
■690    ▼a0984
■690    ▼a0464
■690    ▼a0364
■71020▼aCornell  University▼bComputer  Science.
■7730  ▼tDissertations  Abstracts  International▼g85-12B.
■790    ▼a0058
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17161263▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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