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Fractals from simple polynomial composite functions

Ken Shirriff
1993 Computers & graphics  
This paper describes a method of generating fractals by composing two simple polynomial functions. Many common fractals, such as the Mandelbrot set, the tricorn, and the forced logistic map, as well as new fractals can be generated with this technique. In many cases, the symmetry of the resulting fractal can be easily proved.
doi:10.1016/0097-8493(93)90122-p fatcat:px6s6rc5o5ehbga6ce5whx5xqi

DECODING A VCR CONTROLLER CODE

Ken Shirriff, Curt Welch, Andrew Kinsman
1992 Cryptologia  
The VCR Plus+ is a remote control for programming video cassette recorders. It uses an encrypted 1 to 8 digit number that encodes the channel, start time, length, and day of the month of the television show to be recorded. This paper describes a procedure for decoding the 1 to 6 digit codes.
doi:10.1080/0161-119291866900 fatcat:eatom24vxnf3tlbxfrvrhmbvga

Performance and design evaluation of the RAID-II storage server

Peter M. Chen, Edward K. Lee, Ann L. Drapeau, Ken Lutz, Ethan L. Miller, Srinivasan Seshan, Ken Shirriff, David A. Patterson, Randy H. Katz
1994 Distributed and parallel databases  
RAID-II is a high-bandwidth, network-attached storage server designed and implemented at the University of California at Berkeley. In this paper, we measure the performance of RAID-II and evaluate various architectural decisions made during the design process. We first measure the end-to-end performance of the system to be approximately 20 MB/s for both disk array reads and writes. We then perform a bottleneck analysis by examining the performance of each individual subsystem and conclude that
more » ... he disk subsystem limits performance. By adding a custom interconnect board with a high-speed memory and bus system and parity engine, we are able to achieve a performance speedup of 8 to 15 over a comparative system using only off-the-shelf hardware.
doi:10.1007/bf01266330 fatcat:ljvl4fwrvzfetekzyn76klzowi

Measurements of a distributed file system

Mary G. Baker, John H. Hartman, Michael D. Kupfer, Ken W. Shirriff, John K. Ousterhout
1991 ACM SIGOPS Operating Systems Review  
We analyzed the user-level file access patterns and caching behavior of the Sprite distributed file system. The first part of our analysis repeated a study done in 1985 of the BSD UNIX file system. We found that file throughput has increased by a factor of 20 to an average of 8 Kbytes per second per active user over 10-minute intervals, and that the use of process migration for load sharing increased burst rates by another factor of six. Also, many more very large (multi-megabyte) files are in
more » ... se today than in 1985. The second part of our analysis measured the behavior of Sprite's main-memory file caches. Client-level caches average about 7 Mbytes in size (about one-quarter to onethird of main memory) and filter out about 50% of the traffic between clients and servers. 3570 of the remaining server traffic is caused by paging, even on workstations with large memories. We found that client cache consistencey is needed to prevent stale data errors, but that it is not invoked often enough to degrade overall system performance.
doi:10.1145/121133.121164 fatcat:cidds6ppinfgno4s5f7kkpgrbq

Measurements of a distributed file system

Mary G. Baker, John H. Hartman, Michael D. Kupfer, Ken W. Shirriff, John K. Ousterhout
1991 Proceedings of the thirteenth ACM symposium on Operating systems principles - SOSP '91  
We analyzed the user-level file access patterns and caching behavior of the Sprite distributed file system. The first part of our analysis repeated a study done in 1985 of the BSD UNIX file system. We found that file throughput has increased by a factor of 20 to an average of 8 Kbytes per second per active user over 10-minute intervals, and that the use of process migration for load sharing increased burst rates by another factor of six. Also, many more very large (multi-megabyte) files are in
more » ... se today than in 1985. The second part of our analysis measured the behavior of Sprite's main-memory file caches. Client-level caches average about 7 Mbytes in size (about one-quarter to onethird of main memory) and filter out about 50% of the traffic between clients and servers. 3570 of the remaining server traffic is caused by paging, even on workstations with large memories. We found that client cache consistencey is needed to prevent stale data errors, but that it is not invoked often enough to degrade overall system performance.
doi:10.1145/121132.121164 dblp:conf/sosp/BakerHKSO91 fatcat:fng3lfezhrdpnhttu2x74fihzu

The Sinclair scientific, remade: A classic calculator was reverse engineered from the bare metal - [Hands on]

Stephen Cass
2020 IEEE spectrum  
That began to change in 2013, when Ken Shirriff got wind of the Sinclair Scientific after getting involved with the Visual 6502 team.  ...  (If you want detailed explanations, Shirriff maintains an online version of his simulator that lets you step through the code, line by line.)  ... 
doi:10.1109/mspec.2020.9099924 fatcat:kf2b5iqdizhenkeqzqal5mwqtm

Page 20 of Canadian Personnel and Industrial Relations Journal Vol. 6, Issue 1 [page]

1959 Canadian Personnel and Industrial Relations Journal  
Philip has been made vice-president in charge of Personnel and Public Relations for Salada-Shirriff-Horsey Ltd., of To- ronto ... E. R.  ...  The two life members of the Personnel Association of To- ronto, Carl Rankin and Ken Burgess, both now retired and living the life ° of Reilly, snent the summer in Eurove.  ... 

Romans would have denied robots legal personhood

Luciano Floridi, Mariarosaria Taddeo
2018 Nature  
Ken Shirriff Redwood City, California, USA.  ...  shirriff@righto.com Sebastian Olbrich University of Zurich, Switzerland. sebastian.olbrich@puk.zh.ch used to develop local waterconservation technologies.  ... 
doi:10.1038/d41586-018-05154-5 pmid:29769676 fatcat:3gijfubhs5glpe2jm3bx3ebnja

China–US trade spat could hit the environment

Yong Geng, Joseph Sarkis
2018 Nature  
Ken Shirriff Redwood City, California, USA.  ...  shirriff@righto.com Sebastian Olbrich University of Zurich, Switzerland. sebastian.olbrich@puk.zh.ch used to develop local waterconservation technologies.  ... 
doi:10.1038/d41586-018-05153-6 pmid:29769677 fatcat:hmkaavhnyndhjlmxiiwf6psjku

CerebraLux: a low-cost, open-source, wireless probe for optogenetic stimulation

Robel Dagnew, Yin-Ying Lin, Jerikko Agatep, Michael Cheng, Andrew Jann, Viola Quach, Michelle Monroe, Ganeev Singh, Ani Minasyan, Joshua Hakimian, Theodore Kee, Jesse Cushman (+1 others)
2017 Neurophotonics  
We used an open-source IR remote library developed by Ken Shirriff for the Arduino platform to send and receive signals, which control the LED.  ...  Serial.println(input[i]); irsend.sendSony(input[i], 16); //inputs floats, number of bits delay(150); * Version 0.1 July, 2009 * Copyright 2009 Ken Shirriff * http://arcfn.com */ #include <IRremote.h  ... 
doi:10.1117/1.nph.4.4.045001 pmid:29057282 pmcid:PMC5635269 fatcat:2l5uz4r6cjhctgxindnjfryzou

Page 1 of Caledonian Mercury Vol. , Issue 9282 [page]

1781 Caledonian Mercury  
Ip the year following 4 Lay age ken prifoncs in an. attempt againit Montreal, and font home ja England by -Governor Carleton.  ...  Shirriffe.~ ; Affiftant Deputy Paymajier-General, Geddes, C. Affifiant Commiffary-Geueral, Clarke, C. <e52 GERMAN STAFF. ¥ Surgeons. Branfwick, Praulle, Verbrodt. Hefle Hanaw, Baile, C.  ... 

DTC 375: Languages, Text, and Technology

Roger Whitson
2016
Ken Shirriff, "Y Combinator's Xerox Alto: Restoring the Legendary 1970s GUI Computer" Pick a media device for your final blog. 11/1-11/5 NO CLASS, Professor at conference.  ...  Connect: your conclusions to Shirriff or Stariosielski Grade Breakdown (200 pts each / 1000 pts total) Rubric (75 pts for Information, Discussion; 50 pts for Conventions) Needs Work Criteria Exceeds  ... 
doi:10.17613/m61026 fatcat:mg2ahxkt7vfsddtxm32h3ampeq

Terrorist 'Use' of the Internet and Fighting Back

Maura Conway
2006 Information & Security An International Journal  
Shirriff sums up this point well: Note that The Anarchist Cookbook is available from nearly any bookstore in the U.S.  ...  According to Ken Katzman, a terrorism analyst for the Congressional Research Service, much of the material in these captured documents was probably downloaded from the Internet. 55 As a result, many  ... 
doi:10.11610/isij.1901 fatcat:a5j34eyrjvebpaglgzk5awpq5y

The structure of the colour lexicon

John Archibald, University Of Calgary, University Of Calgary
2016
APPENDIXB By: Ken Shirriff, Oakland, California Diverse languages classify colours in generally the same way. Why do languages follow these rules?  ... 
doi:10.11575/prism/28903 fatcat:4ygvgt6egbdczpqajvfpurea2i

The Zebra Striped Network File System [chapter]

2009 High Performance Mass Storage and Parallel I/O  
Felipe Cabrera, Ann Drapeau, Ken Shirriff, Bruce Montague, and Mary Baker provided useful comments on various drafts of the paper.  ...  Ken Lutz, Peter Chen, Peter Belleau, and Ares Ho built the timer boards that proved invaluable in debugging the system and running the experiments.  ...  Client-level name caching has been used successfully in the AFS file system [Howard88] and Shirriff found that a name cache occupying only 40 Kbytes of a client's memory can produce a hit rate of 97%  ... 
doi:10.1109/9780470544839.ch21 fatcat:ewn7utq6fncknbd3f65lzqamxq
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