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Simulation of neural function in an artificial Hebbian network
[article]
2019
arXiv
pre-print
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It shows the lower left quadrant of the connectivity covariance matrix W T W , where W is the 1024 x 410 correlator weight matrix. ...
Right: off diagonal quadrant of the axon weight covariance matrix, W T W , showing which axons pairs connect to common dendrites. The color scale indicates the number of shared dendrites. ...
arXiv:1912.01088v1
fatcat:s3bdiz4op5fwpbzkns4iggi25i
Overview of the IBM Neural Computer Architecture
[article]
2020
arXiv
pre-print
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Winfried Wilcke received a Ph.D. in experimental nuclear physics (1976) and worked at the University of Rochester, Lawrence Berkeley Lab and Los Alamos on heavy-ion nuclear reactions and meson physics. ...
Wilcke has been chair of several conferences, including Compcon, Hot Chips and is the founder of the Beyond Lithium Ion conference series. Ahmet S. ...
arXiv:2003.11178v1
fatcat:53sbuejfrbaqrocmok5e7l3gdy
Percolation in dense storage arrays
2002
Physica A: Statistical Mechanics and its Applications
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As computers and their accessories become smaller, cheaper, and faster the providers of news, retail sales, and other services we now take for granted on the Internet have met their increasing computing needs by putting more and more computers, hard disks, power supplies, and the data communications linking them to each other and to the rest of the wired world into ever smaller spaces. This has created a new and quite interesting percolation problem. It is no longer desirable to ÿx computers,
doi:10.1016/s0378-4371(02)01153-6
fatcat:5zhup6gwkfblxkxzvyjmpdekn4
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... orage or switchgear which fail in such a dense array. Attempts to repair things are all too likely to make problems worse. The alternative approach, letting units "fail in place", be removed from service and routed around, means that a data communications environment will evolve with an underlying regular structure but a very high density of missing pieces. Some of the properties of this kind of network can be described within the existing paradigm of site or bond percolation on lattices, but other important questions have not been explored. I will discuss 3D arrays of hundreds to thousands of storage servers (something which it is quite feasible to build in the next few years), and show that bandwidth, but not percolation fraction or shortest path lengths, is the critical factor a ected by the "fail in place" disorder. Redundancy strategies traditionally employed in storage systems may have to be revised. Novel approaches to routing information among the servers have been developed to minimize the impact.
Toward Human-Scale Brain Computing Using 3D Wafer Scale Integration
2017
ACM Journal on Emerging Technologies in Computing Systems
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wall' between processor and data, mitigated by a relatively small amount of low-latency cache kept near the processor along with large amounts of storage requiring very long retrieval times [Freitas and Wilcke ...
W. Wilcke, IBM Almaden Research Center, 650 Harry Road, San Jose, CA 95120, USA; email: winfriedwilcke@us.ibm.com. ...
The communication power can be estimated from 1 / 2 C w V 2 based on the capacitance C w per wire, supply voltage V dd , and the number of connections. ...
doi:10.1145/2976742
fatcat:vd7gpbaai5b4zk6uykuioptyh4
Simulating the Cortical Microcircuit Significantly Faster Than Real Time on the IBM INC-3000 Neural Supercomputer
2022
Frontiers in Neuroscience
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While the size of the set W k is limited to |W k | ≤ 256, a network of considerable size as a whole is mapped to a number of nodes. ...
With respect to the synaptic connections, W k represents a set of postsynaptic neurons. ...
doi:10.3389/fnins.2021.728460
pmid:35126034
pmcid:PMC8811464
fatcat:dfw4zurq6ndxhppl3gf7qyjnkq
Biodiversity–multifunctionality relationships depend on identity and number of measured functions
2017
Nature Ecology & Evolution
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. ; Weisser, Wolfgang W (2018). Biodiversity-multifunctionality relationships depend on identity and number of measured functions. Nature Ecology and Evolution, 2(1):44-49. ...
doi:10.1038/s41559-017-0391-4
pmid:29180710
fatcat:ujec7pim6vef3fbwgyen2o3amq
Diversity Promotes Temporal Stability across Levels of Ecosystem Organization in Experimental Grasslands
2010
PLoS ONE
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The diversity-stability hypothesis states that current losses of biodiversity can impair the ability of an ecosystem to dampen the effect of environmental perturbations on its functioning. Using data from a long-term and comprehensive biodiversity experiment, we quantified the temporal stability of 42 variables characterizing twelve ecological functions in managed grassland plots varying in plant species richness. We demonstrate that diversity increases stability i) across trophic levels
doi:10.1371/journal.pone.0013382
pmid:20967213
pmcid:PMC2954171
fatcat:i6aw5w5mn5fkvfipvopdaa5jtu
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... er, consumer), ii) at both the system (community, ecosystem) and the component levels (population, functional group, phylogenetic clade), and iii) primarily for aboveground rather than belowground processes. Temporal synchronization across studied variables was mostly unaffected with increasing species richness. This study provides the strongest empirical support so far that diversity promotes stability across different ecological functions and levels of ecosystem organization in grasslands.
A comparison of the strength of biodiversity effects across multiple functions
2013
Oecologia
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In order to predict which ecosystem functions are most at risk from biodiversity loss, meta-analyses have generalised results from biodiversity experiments over different sites and ecosystem types. In contrast comparing the strength of biodiversity effects across a large number of ecosystem processes measured in a single experiment permits more direct comparisons. Here we present an analysis of 418 separate measures of 38 ecosystem processes. Overall 45% of processes were significantly affected
doi:10.1007/s00442-012-2589-0
pmid:23386044
fatcat:jkimqeehd5clpp6mgtvw7aq5dq
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... by plant species richness, suggesting that whilst diversity affects a large number of processes not all respond to biodiversity. We therefore compared the strength of plant diversity effects between different categories of ecosystem processes: grouping processes according to the year of measurement, their biogeochemical cycle, trophic level and compartment (above-or belowground) and according to whether they were measures of biodiversity or other ecosystem processes, biotic or abiotic and static or dynamic. Overall, and for several individual processes, we found that biodiversity effects became stronger over time. Measures of the carbon cycle were also affected more strongly by plant species richness than were the measures associated with the nitrogen cycle. Further we found greater plant species richness effects on measures of biodiversity than on other processes. The differential effects of plant diversity on the various types of ecosystem processes indicate that future research and political effort should shift from a general debate about whether biodiversity loss impairs ecosystem functions, to focussing on the specific functions of interest and ways to preserve them individually or in combination. Gonzalez A (2011) The functional role of producer diversity in ecosystems. Am J Bot 98:572-592. Cardinale BJ, Srivastava DS, Duffy JE, Wright JP, Downing AL, Sankaran M, Jouseau C (2006) Effects of biodiversity on the functioning of trophic groups and ecosystems. Nature 443:989-992. Cardinale BJ, Wright JP, Cadotte MW, Carroll IT, Hector A, Srivastava DS, Loreau M, Weis JJ (2007) Impacts of plant diversity on biomass production increase through time because of species complementarity. Proc Natl Acad Sci USA 104:18123-18128. Carson WP, Cronin JP, Long ZT (2004) A general rule for predicting when insects will have strong top-down effects on plant communities: on the relationship between insect outbreaks and host concentration. In: Weisser WW, Siemann E (eds) Insects and Ecosystem Function. Springer-Verlag, Berlin. Craine JM, Tilman D, Wedin D, Reich P, Tjoelker M, Knops J (2002) Functional traits, productivity and effects on nitrogen cycling of 33 grassland species. Belowground nitrogen partitioning in experimental grassland plant communities of varying species richness. Ecology 90:1389-1399.
Effects of biodiversity strengthen over time as ecosystem functioning declines at low and increases at high biodiversity
2016
Ecosphere
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. ; Weisser, Wolfgang W; et al (2016) . Effects of biodiversity strengthen over time as ecosystem functioning declines at low and increases at high biodiversity. Ecosphere, 7(12):e01619. Abstract. ...
doi:10.1002/ecs2.1619
fatcat:dopsh2xhynbttjmrwotwwm3yli
Celebrating Chips and Architectures [Guest Editor's Introduction]
1997
IEEE Micro
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Direct questions concerning this introduction to Winfried Wilcke at wilcke@ricochet.net. ...
At IBM Yorktown Heights, Wilcke had managed two large parallel multiprocessor projects, one of which was the
Winfried Wilcke
HAL Computer Systems
Robert Garner
Sun Microelectronics . ...
doi:10.1109/mm.1997.592305
fatcat:llcfnr5xzbcj5m2xawhqadpjoq
Storage-class memory: The next storage system technology
2008
IBM Journal of Research and Development
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Winfried W. Wilcke IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120 (winfriedwilcke@us.ibm.com). Dr. Wilcke is Program Director at the IBM Almaden Research Center. ...
Wilcke became engaged in research on storage-class memories and future systems based on such memories. ...
doi:10.1147/rd.524.0439
fatcat:t7cnxhs4xrh27jq2tpvlzv3o3y
Page 1970 of Mathematical Reviews Vol. , Issue Index
[page]
Mathematical Reviews
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., (2003k:94041)
Kirkpatrick, Scott (with Wilcke, Winfried W.: Garner, Robert B.; Huels, Harald) Percolation in dense storage arrays. ...
Wilcke, Winfried W. sce Kirkpatrick, Scott et al.
Woeginger, Gerhard J. see Constantinides, G. A., 2003b:68076
Xue, Mei Sheng see Tao, Qing et al. ...
Abkürzungen
[chapter]
2008
Prinz, Prinzessin - Samug
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-W. Meyer/M. Noväk/A.
Pruß (ed.), Beiträge zur
Vorderasiatischen Arch-
äologie Winfried Orth-
mann gewidmet (Frank-
furt am Main 2001).
U. Aarburg/P. ...
Wilcke
Fs. J. Wolski
Fs. H. Zinser
FTS
FuB
FuF
GAAL
(H. L. J. Vanstiphout)
(= CunMon. 35, 2006).
W. van Soldt et al. (ed.),
Veenhof Anniversary Vol-
ume. ...
Matous, Gegendstandslisten (Serie HAR-ra = hubullu); 2: W.
MAOG Mitteilungen der Altorientalischen Gesellschaft, 1 -16 (Leipzig 1925 1 -16 (Leipzig -1943 versus, gegen ZL Zimri-Lim Zyl. ...
doi:10.1515/9783110210538-001
fatcat:k3a2e4igr5b3xmnl4u4mlyp7oa
Backmatter
[chapter]
Kultur und Krieg
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Maximilian I. in den Niederlanden (1477-1493), 1987, 27 S. 13 Winfried Schulze .Vom Gemeinnutz zum Eigennutz. ...
Crüsemann, W. Eder, V. Fadinger, F. Gschnitzer, V. Haas, S. Humphreys, P. Machinist, H. Matthäus, W. Nicolai, W. Röllig, H. Sancisi-Weerdenburg, K. Seybold/J. v. Ungern-Sternberg, P. Spahn, C. ...
doi:10.1515/9783110446531-bm
fatcat:c4l5cuea2jac7bzdviv7wqvqoa
Page 2264 of Mathematical Reviews Vol. , Issue Index
[page]
Mathematical Reviews
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(Donald W. Kahn) 2003f:55021 55R35 (54D35)
— see also Current research in operational quantum logic, 2003a:81014
Wilcke, Winfried W. ...
(with Liu, Chester W. J.) Embeddings of Steiner quadruple systems. (English summary) Ars Combin. 65 (2002), 245-250. ...
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