Ryan G McClarren
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- research-article
A collision-based hybrid method for the BGK equation
- Minwoo Shin
Yonsei University, School of Mathematics and Computing, Seoul, 03722, Republic of Korea
, - Cory D. Hauck
Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, 37831, TN, USA
, - Ryan G. McClarren
Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, 46556, IN, USA
Journal of Computational Physics, Volume 501, Issue C•Mar 2024 • https://doi.org/10.1016/j.jcp.2024.112784AbstractWe apply the collision-based hybrid method introduced by Hauck and McClarren [1] to the Boltzmann equation with the BGK operator and a hyperbolic scaling. An implicit treatment of the source term is used to handle stiffness associated with the ...
Highlights- Enhanced numerical efficiency via hybrid (uncollided/collided equations) decomposition.
- Asymptotic-preserving property.
- Improved accuracy through a correction step.
- Novel gas-injection problem to emphasize the efficacy of our ...
- 0Citation
MetricsTotal Citations0
- Minwoo Shin
- research-article
A sweep-based low-rank method for the discrete ordinate transport equation
- Zhuogang Peng
Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN, 46545, USA
, - Ryan G. McClarren
Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN, 46545, USA
Journal of Computational Physics, Volume 473, Issue C•Jan 2023 • https://doi.org/10.1016/j.jcp.2022.111748AbstractThe dynamical low-rank (DLR) approximation is an efficient technique to approximate the solution to matrix differential equations. Recently, the DLR method was applied to radiation transport calculations to reduce memory requirements ...
Highlights- A low-rank scheme for solving radiation transport equation implicitly.
- The ...
- 0Citation
MetricsTotal Citations0
- Zhuogang Peng
- research-article
A low-rank power iteration scheme for neutron transport criticality problems
- Jonas Kusch
Karlsruhe Institute of Technology, Karlsruhe, Germany
, - Benjamin Whewell
University of Notre Dame, Notre Dame, IN, USA
, - Ryan McClarren
University of Notre Dame, Notre Dame, IN, USA
, - Martin Frank
Karlsruhe Institute of Technology, Karlsruhe, Germany
Journal of Computational Physics, Volume 470, Issue C•Dec 2022 • https://doi.org/10.1016/j.jcp.2022.111587AbstractComputing effective eigenvalues for neutron transport often requires a fine numerical resolution. The main challenge of such computations is the high memory effort of classical solvers, which limits the accuracy of chosen ...
Highlights- Solving eigenvalue problems for nuclear systems requires a significant amount of memory.
- 0Citation
MetricsTotal Citations0
- Jonas Kusch
- research-article
A realizable filtered intrusive polynomial moment method
- Graham Alldredge
Berlin, Germany
, - Martin Frank
Karlsruhe Institute of Technology, Karlsruhe, Germany
, - Jonas Kusch
Karlsruhe Institute of Technology, Karlsruhe, Germany
, - Ryan McClarren
University of Notre Dame, Notre Dame, USA
Journal of Computational and Applied Mathematics, Volume 407, Issue C•Jun 2022 • https://doi.org/10.1016/j.cam.2021.114055AbstractIntrusive uncertainty quantification methods for hyperbolic problems exhibit spurious oscillations at shocks, which leads to a significant reduction of the overall approximation quality. Furthermore, a challenging task is to preserve ...
- 0Citation
MetricsTotal Citations0
- Graham Alldredge
- research-article
Data-driven acceleration of thermal radiation transfer calculations with the dynamic mode decomposition and a sequential singular value decomposition
- Ryan G. McClarren
University of Notre Dame, Dept. of Aerospace & Mechanical Engineering, 365 Fitzpatrick Hall, Notre Dame, IN, USA
, - Terry S. Haut
Lawrence Livermore National Laboratory, Livermore, CA, USA
Journal of Computational Physics, Volume 448, Issue C•Jan 2022 • https://doi.org/10.1016/j.jcp.2021.110756Highlights- An acceleration method for positive discrete ordinates methods is introduced.
- ...
AbstractWe present a method for accelerating discrete ordinates radiative transfer calculations for radiative transfer. Our method works with nonlinear positivity fixes, in contrast to most acceleration schemes. The method is based on the ...
- 1Citation
MetricsTotal Citations1
- Ryan G. McClarren
- research-article
Semi-implicit Hybrid Discrete Approximation of Thermal Radiative Transfer
- Ryan G. McClarren
Department of Aerospace and Mechanical Engineering, University of Notre Dame, 46556, Notre Dame, IN, USA
, - James A. Rossmanith
Department of Mathematics, Iowa State University, 50011-2104, Ames, IA, USA
, - Minwoo Shin
Department of Aerospace and Mechanical Engineering, University of Notre Dame, 46556, Notre Dame, IN, USA
Journal of Scientific Computing, Volume 90, Issue 1•Jan 2022 • https://doi.org/10.1007/s10915-021-01686-7AbstractThe thermal radiative transfer (TRT) equations form an integro-differential system that describes the propagation and collisional interactions of photons. Computing numerical solutions of the TRT equations accurately and efficiently is challenging ...
- 1Citation
MetricsTotal Citations1
- Ryan G. McClarren
- research-article
A high-order/low-order (HOLO) algorithm for preserving conservation in time-dependent low-rank transport calculations
- Zhuogang Peng
Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN, 46545, USA
, - Ryan G. McClarren
Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN, 46545, USA
Journal of Computational Physics, Volume 447, Issue C•Dec 2021 • https://doi.org/10.1016/j.jcp.2021.110672Graphical abstractHighlights- A low-rank method is used to compute a closure in radiative transfer simulations.
AbstractDynamical low-rank (DLR) approximation methods have previously been developed for time-dependent radiation transport problems. One crucial drawback of DLR is that it does not conserve important quantities of the calculation, which ...
- 2Citation
MetricsTotal Citations2
- Zhuogang Peng
- research-article
Filtered stochastic Galerkin methods for hyperbolic equations
- Jonas Kusch
Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany
, - Ryan G. McClarren
University of Notre Dame, 257 Fitzpatrick Hall, 46556, Notre Dame, USA
, - Martin Frank
Karlsruhe Institute of Technology, Kaiserstr. 12, 76131, Karlsruhe, Germany
Journal of Computational Physics, Volume 403, Issue C•Feb 2020 • https://doi.org/10.1016/j.jcp.2019.109073Highlights- Solutions of the stochastic Galerkin method oscillate at shocks.
- Filters are ...
AbstractUncertainty Quantification for nonlinear hyperbolic problems becomes a challenging task in the vicinity of shocks. Standard intrusive methods, such as Stochastic Galerkin (SG), lead to oscillatory solutions and can result in non-...
- 6Citation
MetricsTotal Citations6
- Jonas Kusch
- research-article
Parameter inference with deep jointly informed neural networks
- Kelli D. Humbird
Lawrence Livermore National Laboratory Livermore California
Department of Nuclear Engineering Texas A& University College Station Texas
, - J. Luc Peterson
Lawrence Livermore National Laboratory Livermore California
, - Ryan G. McClarren
Department of Aerospace and Mechanical Engineering University of Notre Dame Notre Dame Indiana
Statistical Analysis and Data Mining, Volume 12, Issue 6•December 2019, pp 496-504 • https://doi.org/10.1002/sam.11435AbstractA common challenge in modeling inertial confinement fusion (ICF) experiments with computer simulations is that many of the simulation inputs are unknown and cannot be directly measured. Often, parameters that are measured in the experiment are ...
- 0Citation
MetricsTotal Citations0
- Kelli D. Humbird
- research-article
Uncertainty Quantification for Multigroup Diffusion Equations Using Sparse Tensor Approximations
SIAM Journal on Scientific Computing, Volume 41, Issue 3, pp B545-B575 • https://doi.org/10.1137/18M1185995We develop a novel method to compute first and second order statistical moments of the neutron kinetic density inside a nuclear system by solving the energy-dependent neutron diffusion equation. Randomness comes from the lack of precise knowledge of ...
- 0Citation
MetricsTotal Citations0
Uncertainty Quantification and Predictive Computational Science: A Foundation for Physical Scientists and Engineers
This textbook teaches the essential background and skills for understanding and quantifying uncertainties in a computational simulation, and for predicting the behavior of a system under those uncertainties. It addresses a critical knowledge gap in the ...
- 0Citation
MetricsTotal Citations0
- research-article
Implicit filtered PN for high-energy density thermal radiation transport using discontinuous Galerkin finite elements
- Vincent M. Laboure
Nuclear Engineering Department, Texas A&M University, College Station, TX 77843, USA
, - Ryan G. McClarren
Nuclear Engineering Department, Texas A&M University, College Station, TX 77843, USA
, - Cory D. Hauck
Department of Mathematics, University of Tennessee Knoxville, TN 37996-1320, USA
Journal of Computational Physics, Volume 321, Issue C•September 2016, pp 624-643 • https://doi.org/10.1016/j.jcp.2016.05.046In this work, we provide a fully-implicit implementation of the time-dependent, filtered spherical harmonics (FPN) equations for non-linear, thermal radiative transfer. We investigate local filtering strategies and analyze the effect of the filter on ...
- 4Citation
MetricsTotal Citations4
- Vincent M. Laboure
- research-article
Moment closures based on minimizing the residual of the PN angular expansion in radiation transport
- Weixiong Zheng
Nuclear Engineering, Texas A&M University, College Station, TX 77843-3133, United States
, - Ryan G. McClarren
Nuclear Engineering, Texas A&M University, College Station, TX 77843-3133, United States
Journal of Computational Physics, Volume 314, Issue C•June 2016, pp 682-699 • https://doi.org/10.1016/j.jcp.2016.03.030In this work we present two new closures for the spherical harmonics ( P N ) method in slab geometry transport problems. Our approach begins with an analysis of the squared-residual of the transport equation where we show that the standard truncation ...
- 1Citation
MetricsTotal Citations1
- Weixiong Zheng
- research-article
Positive Filtered P$_N$ Moment Closures for Linear Kinetic Equations
SIAM Journal on Numerical Analysis, Volume 54, Issue 6, pp 3214-3238 • https://doi.org/10.1137/15M1052871We propose a positive-preserving moment closure for linear kinetic transport equations based on a filtered spherical harmonic (FP$_N$) expansion in the angular variable. The recently proposed FP$_N$ moment equations are known to suffer from the occurrence ...
- 3Citation
MetricsTotal Citations3
- article
Positive $P_N$ Closures
SIAM Journal on Scientific Computing, Volume 32, Issue 5•August 2010, pp 2603-2626 • https://doi.org/10.1137/090764918We introduce a modification to the standard spherical harmonic closure used with linear kinetic equations of particle transport. While the standard closure is known to produce negative particle concentrations, the modification corrects this defect by ...
- 11Citation
MetricsTotal Citations11
- article
Robust and accurate filtered spherical harmonics expansions for radiative transfer
- Ryan G. McClarren
Department of Nuclear Engineering, Texas A&M University, College Station, TX 77843-3133, USA
, - Cory D. Hauck
Computational Mathematics Group, Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
Journal of Computational Physics, Volume 229, Issue 16•August, 2010, pp 5597-5614 • https://doi.org/10.1016/j.jcp.2010.03.043We present a novel application of filters to the spherical harmonics (P"N) expansion for radiative transfer problems in the high-energy-density regime. The filter we use is based on non-oscillatory spherical splines and a filter strength chosen to (i) ...
- 34Citation
MetricsTotal Citations34
- Ryan G. McClarren
- article
A modified implicit Monte Carlo method for time-dependent radiative transfer with adaptive material coupling
- Ryan G. McClarren
Institute for Applied Mathematics and Computational Science, Texas A&M University, College Station, TX 77843-3133, USA
, - Todd J. Urbatsch
Computational Physics Group (CCS-2), Los Alamos National Laboratory, P.O. Box 1663, MS D409, Los Alamos, NM 87545, USA
Journal of Computational Physics, Volume 228, Issue 16•September, 2009, pp 5669-5686 • https://doi.org/10.1016/j.jcp.2009.04.028In this paper we develop a robust implicit Monte Carlo (IMC) algorithm based on more accurately updating the linearized equilibrium radiation energy density. The method does not introduce oscillations in the solution and has the same limit as @Dt->~ as ...
- 12Citation
MetricsTotal Citations12
- Ryan G. McClarren
- article
The effects of slope limiting on asymptotic-preserving numerical methods for hyperbolic conservation laws
- Ryan G. McClarren
Computational Physics Group (CCS-2), Los Alamos National Laboratory,1Los Alamos National Laboratory is operated by Los Alamos National Security, LLC for the US Department of Energy under Contract DE-AC52-06NA25396. LA-UR-07-7512.1 P.O. Box 1663, MS D413, Los Alamos, NM 87545, United States
, - Robert B. Lowrie
Computational Physics Group (CCS-2), Los Alamos National Laboratory,1Los Alamos National Laboratory is operated by Los Alamos National Security, LLC for the US Department of Energy under Contract DE-AC52-06NA25396. LA-UR-07-7512.1 P.O. Box 1663, MS D413, Los Alamos, NM 87545, United States
Journal of Computational Physics, Volume 227, Issue 23•December, 2008, pp 9711-9726 • https://doi.org/10.1016/j.jcp.2008.07.012Many hyperbolic systems of equations with stiff relaxation terms reduce to a parabolic description when relaxation dominates. An asymptotic-preserving numerical method is a discretization of the hyperbolic system that becomes a valid discretization of ...
- 6Citation
MetricsTotal Citations6
- Ryan G. McClarren
- article
Semi-implicit time integration for PN thermal radiative transfer
- Ryan G. McClarren
Computational Physics Group (CCS-2), Los Alamos National Laboratory, P.O. Box 1663, MS D413, Los Alamos, NM 875451Los Alamos National Laboratory is operated by Los Alamos National Security, LLC for the U.S. Department of Energy under Contract DE-AC52-06NA25396.1, United States
, - Thomas M. Evans
Reactor Analysis Group, Oak Ridge National Laboratory, P.O. Box 2008, MS 6172, Oak Ridge, TN 37831, United States
, - Robert B. Lowrie
Computational Physics Group (CCS-2), Los Alamos National Laboratory, P.O. Box 1663, MS D413, Los Alamos, NM 875451Los Alamos National Laboratory is operated by Los Alamos National Security, LLC for the U.S. Department of Energy under Contract DE-AC52-06NA25396.1, United States
, - Jeffery D. Densmore
Computational Physics Group (CCS-2), Los Alamos National Laboratory, P.O. Box 1663, MS D413, Los Alamos, NM 875451Los Alamos National Laboratory is operated by Los Alamos National Security, LLC for the U.S. Department of Energy under Contract DE-AC52-06NA25396.1, United States
Journal of Computational Physics, Volume 227, Issue 16•August, 2008, pp 7561-7586 • https://doi.org/10.1016/j.jcp.2008.04.029Implicit time integration involving the solution of large systems of equations is the current paradigm for time-dependent radiative transfer. In this paper we present a semi-implicit, linear discontinuous Galerkin method for the spherical harmonics (P"N)...
- 14Citation
MetricsTotal Citations14
- Ryan G. McClarren
- article
On solutions to the Pn equations for thermal radiative transfer
- Ryan G. McClarren
Computational Physics and Methods Group, Los Alamos National Laboratory, P.O. Box 1663, MS D413 Los Alamos, NM 87545, United States
, - James Paul Holloway
Department of Nuclear Engineering and Radiological Sciences, College of Engineering, University of Michigan, 2355 Bonisteel Boulevard, Ann Arbor, MI 48109 2104, United States
, - Thomas A. Brunner
Sandia National Laboratories, P.O. Box 5800, MS 1186, Albuquerque, NM 87185 1186, United States
Journal of Computational Physics, Volume 227, Issue 5•February, 2008, pp 2864-2885 • https://doi.org/10.1016/j.jcp.2007.11.027We present results for the spherical harmonics (P"n) method for solving problems of time-dependent thermal radiative transport. We prove a theorem that demonstrates that in the streaming limit, the spatially and temporally continuous P"n equations will ...
- 19Citation
MetricsTotal Citations19
- Ryan G. McClarren
Author Profile Pages
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Please see the following 2007 Turing Award winners' profiles as examples: - History: Disambiguation of author names is of course required for precise identification of all the works, and only those works, by a unique individual. Of equal importance to ACM, author name normalization is also one critical prerequisite to building accurate citation and download statistics. For the past several years, ACM has worked to normalize author names, expand reference capture, and gather detailed usage statistics, all intended to provide the community with a robust set of publication metrics. The Author Profile Pages reveal the first result of these efforts.
- Normalization: ACM uses normalization algorithms to weigh several types of evidence for merging and splitting names.
These include:- co-authors: if we have two names and cannot disambiguate them based on name alone, then we see if they have a co-author in common. If so, this weighs towards the two names being the same person.
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The initial release of the Author Edit Screen is open to anyone in the community with an ACM account, but it is limited to personal information. An author's photograph, a Home Page URL, and an email may be added, deleted or edited. Changes are reviewed before they are made available on the live site.
ACM will expand this edit facility to accommodate more types of data and facilitate ease of community participation with appropriate safeguards. In particular, authors or members of the community will be able to indicate works in their profile that do not belong there and merge others that do belong but are currently missing.
A direct search interface for Author Profiles will be built.
An institutional view of works emerging from their faculty and researchers will be provided along with a relevant set of metrics.
It is possible, too, that the Author Profile page may evolve to allow interested authors to upload unpublished professional materials to an area available for search and free educational use, but distinct from the ACM Digital Library proper. It is hard to predict what shape such an area for user-generated content may take, but it carries interesting potential for input from the community.
Bibliometrics
The ACM DL is a comprehensive repository of publications from the entire field of computing.
It is ACM's intention to make the derivation of any publication statistics it generates clear to the user.
- Average citations per article = The total Citation Count divided by the total Publication Count.
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- Publication Count = all works of any genre within the universe of ACM's bibliographic database of computing literature of which this person was an author. Works where the person has role as editor, advisor, chair, etc. are listed on the page but are not part of the Publication Count.
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ACM Author-Izer Service
Summary Description
ACM Author-Izer is a unique service that enables ACM authors to generate and post links on both their homepage and institutional repository for visitors to download the definitive version of their articles from the ACM Digital Library at no charge.
Downloads from these sites are captured in official ACM statistics, improving the accuracy of usage and impact measurements. Consistently linking to definitive version of ACM articles should reduce user confusion over article versioning.
ACM Author-Izer also extends ACM’s reputation as an innovative “Green Path” publisher, making ACM one of the first publishers of scholarly works to offer this model to its authors.
To access ACM Author-Izer, authors need to establish a free ACM web account. Should authors change institutions or sites, they can utilize the new ACM service to disable old links and re-authorize new links for free downloads from a different site.
How ACM Author-Izer Works
Authors may post ACM Author-Izer links in their own bibliographies maintained on their website and their own institution’s repository. The links take visitors to your page directly to the definitive version of individual articles inside the ACM Digital Library to download these articles for free.
The Service can be applied to all the articles you have ever published with ACM.
Depending on your previous activities within the ACM DL, you may need to take up to three steps to use ACM Author-Izer.
For authors who do not have a free ACM Web Account:
- Go to the ACM DL http://dl.acm.org/ and click SIGN UP. Once your account is established, proceed to next step.
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- Sign in to your ACM web account and go to your Author Profile page. Click "Add personal information" and add photograph, homepage address, etc. Click ADD AUTHOR INFORMATION to submit change. Once you receive email notification that your changes were accepted, you may utilize ACM Author-izer.
For authors who have an account and have already edited their Profile Page:
- Sign in to your ACM web account, go to your Author Profile page in the Digital Library, look for the ACM Author-izer link below each ACM published article, and begin the authorization process. If you have published many ACM articles, you may find a batch Authorization process useful. It is labeled: "Export as: ACM Author-Izer Service"
ACM Author-Izer also provides code snippets for authors to display download and citation statistics for each “authorized” article on their personal pages. Downloads from these pages are captured in official ACM statistics, improving the accuracy of usage and impact measurements. Consistently linking to the definitive version of ACM articles should reduce user confusion over article versioning.
Note: You still retain the right to post your author-prepared preprint versions on your home pages and in your institutional repositories with DOI pointers to the definitive version permanently maintained in the ACM Digital Library. But any download of your preprint versions will not be counted in ACM usage statistics. If you use these AUTHOR-IZER links instead, usage by visitors to your page will be recorded in the ACM Digital Library and displayed on your page.
FAQ
- Q. What is ACM Author-Izer?
A. ACM Author-Izer is a unique, link-based, self-archiving service that enables ACM authors to generate and post links on either their home page or institutional repository for visitors to download the definitive version of their articles for free.
- Q. What articles are eligible for ACM Author-Izer?
- A. ACM Author-Izer can be applied to all the articles authors have ever published with ACM. It is also available to authors who will have articles published in ACM publications in the future.
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- A. No. An author does not need to subscribe to the ACM Digital Library nor even be a member of ACM.
- Q. What are the requirements to use this service?
- A. To access ACM Author-Izer, authors need to have a free ACM web account, must have an ACM Author Profile page in the Digital Library, and must take ownership of their Author Profile page.
- Q. What is an ACM Author Profile Page?
- A. The Author Profile Page initially collects all the professional information known about authors from the publications record as known by the ACM Digital Library. The Author Profile Page supplies a quick snapshot of an author's contribution to the field and some rudimentary measures of influence upon it. Over time, the contents of the Author Profile page may expand at the direction of the community. Please visit the ACM Author Profile documentation page for more background information on these pages.
- Q. How do I find my Author Profile page and take ownership?
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- Create a free ACM Web Account
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- Find your Author Profile Page by searching the ACM Digital Library for your name
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- Click the "Add Personal Information" link on the Author Profile Page
- Wait for ACM review and approval; generally less than 24 hours
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- Q. What happens if an author changes the location of his bibliography or moves to a new institution?
- A. Should authors change institutions or sites, they can utilize ACM Author-Izer to disable old links and re-authorize new links for free downloads from a new location.
- Q. What happens if an author provides a URL that redirects to the author’s personal bibliography page?
- A. The service will not provide a free download from the ACM Digital Library. Instead the person who uses that link will simply go to the Citation Page for that article in the ACM Digital Library where the article may be accessed under the usual subscription rules.
However, if the author provides the target page URL, any link that redirects to that target page will enable a free download from the Service.
- Q. What happens if the author’s bibliography lives on a page with several aliases?
- A. Only one alias will work, whichever one is registered as the page containing the author’s bibliography. ACM has no technical solution to this problem at this time.
- Q. Why should authors use ACM Author-Izer?
- A. ACM Author-Izer lets visitors to authors’ personal home pages download articles for no charge from the ACM Digital Library. It allows authors to dynamically display real-time download and citation statistics for each “authorized” article on their personal site.
- Q. Does ACM Author-Izer provide benefits for authors?
- A. Downloads of definitive articles via Author-Izer links on the authors’ personal web page are captured in official ACM statistics to more accurately reflect usage and impact measurements.
Authors who do not use ACM Author-Izer links will not have downloads from their local, personal bibliographies counted. They do, however, retain the existing right to post author-prepared preprint versions on their home pages or institutional repositories with DOI pointers to the definitive version permanently maintained in the ACM Digital Library.
- Q. How does ACM Author-Izer benefit the computing community?
- A. ACM Author-Izer expands the visibility and dissemination of the definitive version of ACM articles. It is based on ACM’s strong belief that the computing community should have the widest possible access to the definitive versions of scholarly literature. By linking authors’ personal bibliography with the ACM Digital Library, user confusion over article versioning should be reduced over time.
In making ACM Author-Izer a free service to both authors and visitors to their websites, ACM is emphasizing its continuing commitment to the interests of its authors and to the computing community in ways that are consistent with its existing subscription-based access model.
- Q. Why can’t I find my most recent publication in my ACM Author Profile Page?
- A. There is a time delay between publication and the process which associates that publication with an Author Profile Page. Right now, that process usually takes 4-8 weeks.
- Q. How does ACM Author-Izer expand ACM’s “Green Path” Access Policies?
- A. ACM Author-Izer extends the rights and permissions that authors retain even after copyright transfer to ACM, which has been among the “greenest” publishers. ACM enables its author community to retain a wide range of rights related to copyright and reuse of materials. They include:
- Posting rights that ensure free access to their work outside the ACM Digital Library and print publications
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