simulation@uflorida.cis.ufl.edu (Moderator: Paul Fishwick) (06/14/91)
Volume: 22, Issue: 3, Thu Jun 13 13:33:10 EDT 1991 +----------------+ | TODAY'S TOPICS | +----------------+ (1) RE: Kalman Filters (2) Fast Normal Random Variate Generation (3) CALL: Fuzzy Control Workshop (4) NEWSGROUP: Comp.Online (5) WANTED: Synthetic Unix Workloads * Moderator: Paul Fishwick, Univ. of Florida * Send topical mail to: simulation@bikini.cis.ufl.edu OR post to comp.simulation via USENET * Archives available via FTP to bikini.cis.ufl.edu (128.227.224.1). Login as 'ftp', use your last name as the password, change directory to pub/simdigest. Do 'type binary' before any file xfers. * Simulation Tools available by doing above and changing the directory to pub/simdigest/tools. ----------------------------------------------------------------------------- Date: Thu, 6 Jun 1991 13:39:08 -0700 (PDT) From: Terry Cline <terry@bird.clarity.com> To: fishwick@fish.cis.ufl.edu Subject: Re: SIMULATION DIGEST V22 N2 To the person who asked about simulating Kalman filters and the GPS navigation system: The folks at The Analytic Sciences Corp. in Reading, MA do this sort of thing for a living (among other things). I haven't worked there for almost 10 yrs so I don't even remember a phone number, but they should be easy to reach. Try asking for Ray Nash who could refer you to where in their organization to go. Terry Cline Clarity Software, Inc. 2700 Garcia Ave. Mt. View, CA 94043 415-691-0320x250 tcline@clarity.com ------------------------------ To: uunet!comp-simulation@uunet.UU.NET Path: motcid!reilly From: motcid!reilly@uunet.UU.NET (Patrick L. Reilly) Newsgroups: sci.math,sci.math.num-analysis,sci.math.stat,comp.simulation Subject: Normal Variate Generator Error Summary: error in normal variate generator Keywords: normal variate generator errors Date: 7 Jun 91 00:23:04 GMT Reply-To: motcid!uunet.uu.net!motcid!reillyp@uunet.UU.NET Distribution: sci Organization: Motorola Inc., Cellular Infrastructure Div., Arlington Heights, IL I am interested in any information that might have appeared in subsequent journal articles that describe the normal variate generation method proposed in "Computer Generation of Normal Random Variates" A.J. Kinderman & J.G. Ramage Journal of the American Statistical Asso. Dec. 1976, vol. 71, Number 356 The article describes a very fast normal variate generator that has been implemented. Unfortunately, the author's choices of some of the constants used are not very intuitive and some further discussion might exist elsewhere in the literature. More importantly, however, is a very subtle aberration in the distribution generated by the algorithm. The subtlety is so great that it is not noticeable until 100 million samples have been generated and a histogram plot made. The user will then note a bi-modal property centered around the mean. We have been able to correct this by experimentation, but prefer to have a better understanding of the method and to discover is earlier experimenters have observed this problem and its correction noted by the authors. Please e-mail to me direct: reilly@motcid.rtsg.mot.com I will post the results. ============================= `` '' ============================== Patrick Reilly, Ph.D. < @ @ > tel: 1+708+632-3109 Motorola CIG/Switch Dev. ( > ) fax: 1+708+632-2413 1501 W. Shure Dr. \~/ UUNET: uunet!motcid!reilly Mail Drop BC569/G194 reilly@motcid.rtsg.mot.com Arlington Hts., IL 60004 REilly's CAutioNary Truth: Any ill-formed premise may be -- -- - - modeled and validated with simulation. ================================================================== ------------------------------ Date: Fri, 7 Jun 91 13:12:57 -0400 From: "Paul Fishwick" <fishwick@fish.cis.ufl.edu> To: simulation@ufl.edu Subject: CALL: Fuzzy Control Workshop [[ED: Forwarded from comp.ai -PAF]] >From uflorida!math.ufl.edu!eng.ufl.edu!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!liuida!petek Fri Jun 7 13:11:39 EDT 1991 Article: 8996 of comp.ai Path: uflorida!math.ufl.edu!eng.ufl.edu!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!rpi!uupsi!sunic!liuida!petek From: petek@ida.liu.se (Peter Eklund) Newsgroups: comp.ai Subject: IJCAI workshop on fuzzy control, deadline July 1 Date: 6 Jun 91 10:01:39 GMT Sender: news@ida.liu.se Organization: CIS Dept, Univ of Linkoping, Sweden ************DEADLINE NOW JULY 1********** ANNOUNCEMENT - CALL FOR PARTICIPATION FUZZY CONTROL WORKSHOP IJCAI-91, SYDNEY, AUSTRALIA AUGUST 24, 1991 WORKSHOP COMMITTEE Prof. Dr H J Zimmermann, RWTH Aachen, Aachen Dr M Reinfrank, Siemens AG, Munich Prof. L A Zadeh, University of California at Berkeley Prof. M Sugeno, Tokyo Institute of Technology Dr D Driankov (Chairman), University of Linkoping During the past several years fuzzy control has emerged as one of the most active and fruitful research areas in the application of fuzzy set theory, especially in the realm of industrial processes which do not lend themselves to control by conventional methods. Fuzzy control has appeared as a qualitative extension of classical control theory and is very similar to AI knowledge representations in that both model the ``common sense'' knowledge of an experienced human operator. In essence the theory of fuzzy control provides for an algorithm which can convert the control knowledge of an operator into an automatic control strategy. In particular fuzzy control theory appears very useful when; * linearity and time-invariance can not be assumed; the responses to change in manipulated variables are non-linear and highly sensitive in certain regions. There are significant transport lags in the process and the process itself is subject to random disturbances. * it is difficult to derive differential/difference equations representing the process i.e. there is a lack of a well-posed mathematical model. At the same time the ability of the exper- ienced operator to cope with such a process is recognized and these operators can describe their knowledge of control actions linguistically as a set of rules. * the human understanding of the process and its conventional mathematical description are alien and this results in a lack of an effective man-machine interface. However, despite of the indisputable success of the theory of fuzzy control, there remain a number of issues which are consider- ed to be its weak points requiring further investigation and more solid treatments. It is these issues which will be the focus of the workshop; * efficient systematic methods for knowledge acquisition. So far the process of transferring the operator's knowledge into a usable knowledge base have been time consuming and non-trivial. * conception and design of fuzzy control systems that have the capacity to learn from experience, that is a combination of techniques from both fuzzy logic and neural networks can improve the learnability and adaptability of a fuzzy controller in a changing environment. * well-founded formal procedures for fuzzy controller design based on fuzzy models of the process. The need for the development of fuzzy dynamic systems theory is urgent with its emphasis on the modeling of the linguistic structure of the process which extends in a qualitative way the fundamental notions of state, controll- ability and stability. It is at this last juncture that the theory of fuzzy control and recent developments in qualitative reasoning in AI meet each other and can be cross-fertilized. However, these two approaches have developed independ- ently from one another and there has been almost no exchange of ideas between the two scientific communities. In control theory the terms fuzzy rule-based formalism can be likened to a qualitative input/output model whereas the AI approach is akin to a qualitative state-space description and performs the function of an internal representation of the process. Thus, the fuzzy control representation describes what an operator does rather than why he does it. The knowledge about the later can only come from the internal representation of the process i.e. its model. In this context the workshop will provide a framework within which the similarities and differences between the two approaches can be highlighted and discussed in depth. Speakers will be by invitation. For participants, a short abstract of the author's experience in fuzzy control or qualitative reasoning should be delivered to the workshop secretary at the address below by 1 July, 1991. Peter Eklund (Secretary/Organizer) Department of Computer and Information Science University of Linkoping S-581 83 Linkoping, Sweden tel. (+46) 13 281950 fax. (+46) 13 142231 pwe@ida.liu.se (internet) pwe@seliuida (bitnet) ------------------------------ Date: Sun, 9 Jun 91 23:53:21 EDT From: tale@cs.rpi.edu (David C Lawrence) To: simulation@cis.ufl.edu Subject: RFD: comp.online Newsgroups: news.announce.newgroups,news.groups,comp.society.futures,alt.privacy,comp.infosystems,comp.simulation,soc.net-people,sci.research,bionet.general,comp.groupware,sci.virtual-worlds Path: rpi!bounce-back >From: cyberoid@milton.u.washington.edu (Robert Jacobson) Subject: RFD: comp.online moderated Followup-To: news.groups Sender: tale@cs.rpi.edu Nntp-Posting-Host: cs.rpi.edu Organization: Human Interface Technology Lab, Univ. of Wash., Seattle Date: 10 Jun 91 03:41:45 GMT Approved: tale@rpi.edu I would like to propose the creation of a new newsgroup, COMP.ONLINE The purpose of this newsgroup would be to discuss the phenomena of being "online" -- what it means to be part of an electronic community. To my knowledge, there are no newsgroups dealing broadly with this issue. Individual newsgroups may deal with the conversations happening locally, as in the various muds newsgroups; or the topic may come up spontaneously and then die, as it has in comp.society on occasion. Yet the experience of being online is central to what all of us do here: it deserves some special attention. I suggest putting this new newsgroup in the comp. hierarchy because being online is irrevocably tied up with the use of computers and information technology. It could also go in rec. (since we often recreate online) or soc. (because we are a social happening) or alt. (where nearly every- thing else ends up). But comp. feels right to me. I propose further that this newsgroup be moderated. I offer to do the moderation, at least initially. I have been a host on USENET (sci. virtual-worlds) for nearly a year; before that, I hosted two conferences on The WELL and ran a legislative BBS for the California State Assembly. My credentials are in order. Please let the online crowd know what YOU think about this proposal. Also, please crosspost this announcement to such other newsgroups as you think are appropriate. After approximately one month of discussion, I will call for a vote on creating comp.online Thanks for your attention and your ideas. Bob Jacobson Moderator, sci.virtual-worlds -- Associate Director Human Interface Technology Laboratory Washington Technology Center c/o University of Washington, Seattle 206-543-5075 (Employment given for purposes of identification only; the HIT Lab hosts only sci.virtual-worlds and has no connection to this proposal.) ------------------------------ Date: Mon, 10 Jun 91 08:34:55 EDT From: Tom.Murray@cs.clemson.edu (Tom Murray) To: simulation@bikini.cis.ufl.edu Subject: Wanted: Synthetic Unix Workloads I am constructing a simulation model of a Unix process scheduling mechanism. I'm looking for synthetic system workloads to feed both the simulator and a real Unix system. Does anyone know whether any such workloads exist in the public domain? I'm interested in workload models or benchmark specs for the "typical Unix environment," whatever that is! Although it would be nice to find a realistic workload, that's not a requirement. Any that are well-known or widely-accepted by the Unix operating system modeling community should satisfy my need. _____________________________________________________________________________ Tom Murray tom@cs.clemson.edu Computer Science Department Clemson University ------------------------------ END OF SIMULATION DIGEST ************************