Leibovitz, D. P. (2006) Training Strategies in an SRNN. Working Paper, pp. 1-5. Carleton University. [doi: 10.13140/RG.2.1.2035.2483] (pdf)
Abstract: The effects of various training strategies are investigated on a Simple Recurrent Neural Network (SRNN) that learned to emulate an 8-Digit up/down/resettable counter.
Links:
Leibovitz, D. P. (2003-6) OttHtJobs: Ottawa-Gatineau Region High-Tech Companies, Agencies, Job Boards, Etc. Retrieved September 4, 2015 from http://www.otthtjobs.upwize.com/companies.html. [doi: 10.13140/RG.2.1.4714.9282]
Abstract: 
Here are 2000+ links to career pages of every high-tech related company, agency or job board in the Ottawa-Gatineau Region.
Every day, all these sites are scanned, and new job opportunities found are emailed to subscribers.
This job site was founded in 2003 and became inactive in 2006 at which time it had over 4000 subscribers.
Links:
Leibovitz, D. P., Nath, U., Sedghi, R., Verger, D. (2006) Distinctive Serial Recall Effects. Poster presented at the Cognitive Science Spring Conference of Carleton University, pp. 1-18, Ottawa, Ontario, Canada. [doi: 10.13140/RG.2.1.2012.5926]
Abstract: The study of word-length effect concentrated mostly on the accuracy of recalling short and long words in both pure and mixed lists. Previous studies showed that pure long lists were much poorly remembered. Hulme et al. (2004) found that word-length effect could be abolished in mixed lists when the short and long words are alternated. We investigated distinctiveness and found it to be a salient cue for improved correct recall when the list of words has a single distinctive transition. Lists contained three short words following by three long words and vice versa. Surprisingly, in the short-long condition, there was also an improvement in position 3 recall. One of the possible explanations could be the strategic shift of working memory resource.
Links:
Leibovitz, D. P. (2005) Snoring To Attention. Poster presented at the Cognitive Science Spring Conference of Carleton University, pp. 1-16, Ottawa, Canada. [doi: 10.13140/RG.2.1.1357.2324]
Abstract: 
Why don’t you hear your own snoring, while your partner does?
A Perceptual Learning and Matching System (PLMS) is hypothesized that pre-attends the auditory scene during sleep with the goal of classifying sounds into the background to be ignored or into the foreground which will cause arousal for further conscious action. It is also active while an individual is awake and is responsible for the automatic acquisition of capabilities such as non-conceptual linguistic components.
In the case of chaotic snoring sounds, the partner’s PLMS cannot detect a pattern and will awaken the partner, while the snorer’s PLMS will correlate the snoring sounds directly with the individual’s own breathing pattern and hence, ignore it.
The main purpose of this investigation is to understand the functional characteristics of PLMS during a sleep paradigm which is not confounded by consciousness nor rationality. PLMS is a hitherto new cognitive system not before studied.
A secondary purpose is to investigate whether the PLMS of the snorer’s partner can be trained to ignore the snoring sounds. Several experiments are proposed to verify this possibility. Partners of snorers may be more affected than the snorers themselves!
Links:
Leibovitz, D. P. (2005) Motivation. Handout produced for the Writing Tutorial Service of Carleton University, pp. 1-4, Ottawa, Ontario, Canada. [doi: 10.13140/RG.2.1.1618.3521]
Abstract: 
Writing an academic paper may seem like hiking up an unfamiliar mountain without a trail map. The total effort is immense, you don’t know the area, and you may not feel fit enough to handle the stress. There is also a maze of trails: some trails are interesting, some tiresome and some simply leading nowhere. Where should you start, how should you start, and is it possible to leave your own mark?
Here are a few motivational techniques and ideas to get you climbing…
Links:
Leibovitz, D. P. (2005) Reformulating. Workshop presented to the “FYSM 1605: Language, Identity and Education” class. Carleton University, pp. 1-17, Ottawa, Ontario, Canada. [doi: 10.13140/RG.2.1.3125.0402] (pdf)
Abstract: Learn how reformulating an academic paper improves upon editing.
Documents:
Links:
Leibovitz, D. P. (2005) Academic Papers. Workshop presented to the “FYSM 1104: Human Rights: Issues and Investigations” class. Carleton University, pp. 1-24, Ottawa, Ontario, Canada. [doi: 10.13140/RG.2.1.1503.0242] (pdf)
Abstract: Learn how academic writing at the university level differs from that in high-school.
Documents:
Links:
Leibovitz, D. P. (2005) Peer Review. Workshop presented to the “FYSM 1307: Psychology and Criminal Justice” class. Carleton University, pp. 1-10, Ottawa, Ontario, Canada. [doi: 10.13140/RG.2.1.4386.6082] (pdf)
Abstract: Learn how to improve your writing via peer review.
Documents:
Links:
Leibovitz, D. P. (2005) Framing & Synthesizing. Workshop presented to the “FYSM 1307: Psychology and Criminal Justice” class. Carleton University, pp. 1-7, Ottawa, Ontario, Canada. [doi: 10.13140/RG.2.1.1109.8080] (pdf)
Abstract: Learn how to frame and synthesize for academic writing.
Documents:
Links:
E. Woods & D. P. Leibovitz (2005) ESL: Common Problems. Workshop presented to the “ESLA 1500: Intermediate English as a Second Language for Academic Purposes” class. Carleton University, pp. 1-3, Ottawa, Ontario, Canada [doi: 10.13140/RG.2.1.2617.1361] (plan, presentation)
Abstract: To encourage ESL students in their writing by showing them that many of the writing problems they experience are in fact experienced by many native writers as well. To collaborate with the students to come up with some solutions which may help them respond to these problems in future writing assignments. All of this should be interactive with very little ‘lecture style’ teaching.
Documents:
See also:
Links:
Historical Logo
During 2004-2005, David tutored individual students, and customized and led workshops for entire classes on improving all aspects of writing.
Customized and led workshops for the following classes:
External Links
Leibovitz, D. P. et.al. (1988-2002) Numerous internal Functional Specifications, Systems Descriptions, Test Plans, etc. Nortel Networks, Ottawa, Canada.
Abstract: Telecommunication networks are complex adaptive systems with some similarities to brain and mind. While working at BNR and Nortel, numerous internal and customer facing documents were authored, contributed to, and reviewed.
Northern Telecom Practice (NTP) contributions:
Links:
In 1999, David was still working for Nortel in Harlow. See Harlow, Essex, England (United Kingdom).
Organizations
Carleton University is a comprehensive public university located in Ottawa, Ontario, Canada. It was attended by David during 1993 & 2003 – 2013.
External links
GemIdent is a gem identification software and data base used in gemology.It should not be confused with a similarly named image recognition program. GemIdent is derived off MinIdent.
GemIdent represents information about gems in a statistical manner and identifies unknown gems with a fuzzy-like matching system.
People. GemIdent was developed between 1989 and 1990 by David Pierre Leibovitz and Heideh Omoumi.
Related Publications:
Omoumi, H. (1990) GemIdent: a data base for gems and some applications of the electron microprobe in gem characterisation. MSc. Thesis, University of Alberta.
Heideh Omoumi (Heida Mani) is Director of Markets & Industry at Vale. In 1990, she received a Masters of Science (MSc) degree in Mineralogy at the University of Alberta where she collaborated with David Pierre Leibovitz.
Collaborations:
Joint Publications:
Smith, D. G. W., Omoumi, H., & Leibovitz, D. P. (1989) The MinIdent database: some recent development. 28th International Geological Congress. Abstracts 3: 138-139 [doi: 10.13140/RG.2.1.5092.7842]
Links:
Smith, D. G. W., Omoumi, H., & Leibovitz, D. P. (1989) The MinIdent database: some recent development. 28th International Geological Congress. Extended Abstract, 3: 138-139. [doi: 10.13140/RG.2.1.5092.7842] (pdf)
Abstract: The MinIdent database and the software for mineral identification (Smith &: Leibovitz 1984, 1986; Smith, 1986) have been successfully ported to a PC from the Amdahl mainframe on which they were developed. The “compiled” data base (used in mineral identification) plus necessary management programs can be accommodated on a 30 Mbyte hard disc. Developments presently being undertaken, will further reduce these storage requirements.
Since the publication by Smith &: Leibovitz (1986). many new data have been added and information now exists for some 4.200 mineral varieties. species. series. groups etc. Literature and data-entry errors are being identified using tests for self-consistency. and progressively eliminated.
In particular. that part of the database dealing with un-named minerals has been greatly expanded, and reorganised by year of first description. Data for un-named minerals are presently scattered throughout 100 years of earth science literature and range from vague descriptions of hand-specimen properties to complete modern analyses. The lists compiled by Hey (1962. 1963) were made the starting point. and then a wide range of journal and other literature sources used to obtain additional information and to bring the list up to date. Only those minerals for which numerical data are available have been included. Presently. nearly 600 un-named minerals appearing in the literature have been included. Once complete, this subset of the database will provide a unique resource and will allow users attempting to identify unknowns to compare their data with those for all previously described minerals and not only with those species that have received names. The use of the mineral identification software permits a numerical estimate to be obtained of the similarity between an unknown and previously described species. The immediate availability of a compilation of literature data for the latter provides a convenient indication of what other parameters might be obtained for a more unambiguous identification. The possibility also exists of adding a further category of data – for phases which have been obtained as the products of experimental work but which have not so far been found occurring naturally.
Another addition to MinIdent is a substantial list of discredited mineral names and synonyms. Entries are also included for minerals which although of dubious authenticity have not been unequivocally discredited and therefore remain in the database. At present there are about 1500 entries in the list, each of which includes a brief explanatory comment, the synonym (where applicable) and source reference(s). The scheme for naming rare earth-bearing minerals which was recently approved by the lMA has been fully implemented and, as far as possible, data associated with each rare earth variant of that species, appropriately assigned. However, the paucity of complete and reliable information on the concentrations of individual rare earths, continues to pose a problem. The re cent IMA decision to return to the original spelling of many non-English names has been implemented, although present software constraints preclude the inclusion of diacritical marks in such names.
Classification of minerals has been possible since the inception of ~dent. This facility has now been expanded so that the following divisions can be recognised where appropriate: variety, sub-species, species, series, sub-group, group, super-group, family, class and type. The top level “type” (e.g., silicates, oxides, sulphides, etc.) has been chosen to avoid ambiguity or overlap with other levels of classification previously used in the literature. Much progress has been achieved particularly with respect to rock-forming and more common minerals. For example, the full IMA amphibole classification scheme has been implemented (Goble &: Smith, 1988), and that for pyroxenes is presently being undertaken. However, much remains to be done and progress is hindered by the absence of a gene rally accepted and definitive classification scheme for minerals.
Other changes include the up-dating of the JCPDS PDF number and the entry or re-entry of the d-values for the five most intense lines from original literature sources. The algorithm that was specially developed for MinIdent to identify minerals on a very limited number of d-values has proved to work very well on pure phases. It is not intended for use with mixtures of phases.
Finally, a sub-set facility has been implemented which allows any group of minerals of interest to be selected from the database, and subsequently only these to be considered in the MATCH/IDENTIFY procedures. Such subsets are entirely flexible and could include categories such as “silicates”. “meteorite minerals” – or sets of minerals for instructional purposes. The use of subsets greatly reduces computational time for identification. It could prove extremely useful for the automation of mineral identification in combination with the analytical and image analysis capabilities of modern microbeam instruments.
References:
Goble, R.J. &: Smith, D.G.W. (1988): MinIdent: An application to the identification and
classification of amphiboles. Mineral. Petrol. v.38, p.213-227.
Hey. M.H. (1962): Chemical Index of Minerals. Brit. Mus. Nat. Hist. (London), 728 pp.
Hey, M.H. (1963): Appendix to Chemical Index of Minerals. Brit. Mus. Nat. Hist. (London) 135pp.
Smith, D.G.W. (1986): Automation of mineral identification from electron microprobe analyses. In: “Microbeam Analysis – 1986” (A. D. Romig &: W. F. Chambers. Eds.) San Francisco Press, San Francisco, U.S.A.
Smith, D.G.W. &: Leibovitz, D.P. (1986): MinIdent: A data base for minerals and a computer pro gram for their identification.
Smith D.G.W. &: Leibovitz, D.P. (1984): A computer based system for identification of minerals on the basis of composition and other properties. 27th Internat. Geol. Congr .• Moscow (1984) Abstracts v.5. p.169.
Links:
DPN-100 was a an X.25 based packet switch that ran Canada’s DATAPAC network. It was developed by Bell-Northern Research (BNR) which was folded into Nortel.
Nortel was a multinational telecommunications and data networking equipment manufacturer headquartered in Canada. At its height, Nortel accounted for more than a third of the total valuation of all the companies listed on the Toronto Stock Exchange (TSX), employing 94,500 worldwide. In the 1990s, Nortel absorbed Bell-Northern Research (BNR) into its R&D organization. Founded in 1895, the company ceased operations in 2009.
Between 1988 – 2002, David Pierre Leibovitz worked at BNR/Nortel.
Research
Work Experience
Locations
Products
External links
Ottawa Panorama by Wikicanadia
Ottawa is the national capital of Canada and lies within the province of Ontario. David has lived there since 1988.
External links
During 1988–2002, David Pierre Leibovitz worked at Bell-Northern Research and Nortel in Ottawa. He architected human-computer interaction software based on a hierarchical knowledge representation for a complex adaptive real-time communication system.
Organizations
Bell-Northern Research (BNR)NortelSee also:
Bell-Northern Research (BNR) was a telecommunications research and development organization that was eventually absorbed into Nortel. BNR was based in Ottawa, Ontario, Canada, with campuses at locations around the world. Bell-Northern Research pioneered the development of digital technology, and created the first practical digital PBX, (SL1), and central office (DMS).
David Pierre Leibovitz worked at BNR/Nortel between 1988 and 2002
External links
During 1988–2002, David Pierre Leibovitz worked at Bell-Northern Research and Nortel in Ottawa. He architected human-computer interaction software based on a hierarchical knowledge representation for a complex adaptive real-time communication system.
Research
Positions
Organizations
Products:
Locations
