Search Constraints
Number of results to display per page
View results as:
Search Results
-
- Creator:
- Nguyen, Thanh H., Wright, Mason, Wellman, Michael P., and Singh, Satinder
- Description:
- In this work , we study the problem of allocating limited security countermeasures to protect network data from cyber-attacks, for scenarios modeled by Bayesian attack graphs. We consider multi-stage interactions between a network administrator and cybercriminals, formulated as a security game. We propose parameterized heuristic strategies for the attacker and defender and provide detailed analysis of their time complexity. Our heuristics exploit the topological structure of attack graphs and employ sampling methods to overcome the computational complexity in predicting opponent actions. Due to the complexity of the game, we employ a simulation-based approach and perform empirical game analysis over an enumerated set of heuristic strategies. Finally, we conduct experiments in various game settings to evaluate the performance of our heuristics in defending networks, in a manner that is robust to uncertainty about the security environment.
- Keyword:
- Empirical Game-Theoretic Analysis, Multi-stage Security Games, Attack Graph, Game Theory, and Moving Target Defense
- Citation to related publication:
- Nguyen, T. H., Wright, M., Wellman, M. P., & Singh, S. (2017). Multi-stage attack graph security games: Heuristic strategies, with empirical game-theoretic analysis. In MTD 2017 - Proceedings of the 2017 Workshop on Moving Target Defense, co-located with CCS 2017 (Vol. 2017-January, pp. 87-97). Association for Computing Machinery, Inc. https://doi.org/10.1145/3140549.3140562
- Discipline:
- Science and Engineering
-
- Creator:
- Bemmels, Jordan B. and Dick, Christopher W.
- Description:
- Raw SNP genotypes are provided in STRUCTURE format, with a maximum of one SNP reported per ddRAD locus. The files "caryco_SNP.str" and "caryov_SNP.str" are genotypes for Carya cordiformis and Carya ovata, respectively. The first column of each file is the individual name, the second column is the population (see original publication for information on population locations), and the remaining columns are genotypes of individual SNPs. Rows represent individuals, with the diploid genotypes contained on two lines per individual. Missing data are entered as "0" (zero). The first row is a header with a unique identifier for each SNP. and Occurrence records for each species are provided in the file "occs_carya.csv" and contain the latitude and longitude of each record.
- Keyword:
- eastern North America, glacial refugia, phylogeography, temperate trees, and single nucleotide polymorphisms
- Citation to related publication:
- Bemmels, J.B., and C.W. Dick. 2018. Genomic evidence of a widespread southern distribution during the Last Glacial Maximum for two North American hickory species. Journal of Biogeography, 45: 1739– 1750. https://doi.org/10.1111/jbi.13358
- Discipline:
- Science
-
- Creator:
- Yakel, Elizabeth, Suzuka, Kara, and Frank, Rebecca
- Description:
- These data collection and analysis protocols and the attribute list are part of a larger research project, the Institute of Museum and Library Services # LG-06-14-0122-14. funded "Qualitative Data Reuse: Records of Practice in Educational Research and Teacher Development." As such, our research questions concern data reuse and data curation: 1. Data Reuse: What are the dynamics of the data reuse lifecycle (from selection of data through the reuse of data) in a qualitative digital educational archive? 2. Data curation: What special issues are involved in curating digital qualitative data for reuse? • How can qualitative data archives best support data reusers throughout the data reuse lifecycle? • What aspects of this experience are informative for other types of qualitative data archives? The overall project employed mixed methods and collected interview, observational, and trace data from data reusers of video records of practice in education and repositories holding video records of practice. The interview protocol and interview codeset relate to the 44 interviews conducted with researchers and teacher-educators who have reused digital video records of practice as qualitative data for research and/or teaching.
- Keyword:
- Data curation, Data reuse, and Digital records of practice in education
- Citation to related publication:
- Frank, Rebecca D, Tyler, Allison R. B., Gault, Anna, Suzuka, Kara, and Yakel, Elizabeth, (forthcoming), "Issues of Privacy in Qualitative Video Data Reuse," International Journal of Digital Curation , Suzuka, K., Frank, R., Crawford, E. & Yakel, E. (2018). Video re-use in mathematics teacher education. In E. Langran & J. Borup (Eds.), Proceedings of Society for Information Technology & Teacher Education International Conference (pp. 329-336). Washington, D.C., United States: Association for the Advancement of Computing in Education (AACE). https://www.learntechlib.org/primary/p/182544/., Frank, R. D., Chen, Z., Crawford, E., Suzuka, K. and Yakel, E. (2017), Trust in qualitative data repositories. Proceedings of the Association for Information Science and Technology, 54: 102–111. http://dx.doi.org/10.1002/pra2.2017.14505401012, and Frank, R. D., Suzuka, K., & Yakel, E. (2016). Examining the Reuse of Qualitative Research Data: Digital Video in Education. In Archiving Conference (Vol. 2016, pp. 146–151). Washington, DC: Society for Imaging Science and Technology. https://doi.org/10.2352/issn.2168-3204.2016.1.0.146
- Discipline:
- Other
-
- Creator:
- Heath, Jeffrey
- Description:
- Videos made in the course of linguistic fieldwork. Includes blacksmithing, hide tanning, weaving, cotton spinning, weaving, reed flute making, pottery making, and construction in Dogon villages, and exotic traditional hair styling in Hombori (Songhay). Some of the videos are "compilations" of many short clips, others are in standard documentary form.
- Keyword:
- Mali, Dogon, Hombori, weaving, pottery, spinning, reed flute making, tanning, and coiffure
- Citation to related publication:
- Moran, Steven & Forkel, Robert & Heath, Jeffrey (eds.) 2016. Dogon and Bangime Linguistics. Jena: Max Planck Institute for the Science of Human History. http://dogonlanguages.org
- Discipline:
- Humanities
-
- Creator:
- Heath, Jeffrey
- Description:
- Videos done in the course of linguistic fieldwork in Central Mali. They are presented here in two or three video formats. The videos show how Dogon villagers press oil from nuts and fruit pits, make liquid soda ash (French potasse), and make soap. Some are in standard documentary form, some early ones ("compendiums") are sequences of brief clips. Most were made in Beni village or in the Douentza area.
- Keyword:
- Mali, Dogon, vegetable oils, soapmaking, and soda ash
- Citation to related publication:
- Moran, Steven & Forkel, Robert & Heath, Jeffrey (eds.) 2016. Dogon and Bangime Linguistics. Jena: Max Planck Institute for the Science of Human History. http://dogonlanguages.org
- Discipline:
- Humanities
-
- Creator:
- Heath, Jeffrey
- Description:
- These videos were shot in Dogon villages. They show how wild foods (insects and plants) are obtained and consumed. Most are presented here in three video formats.
- Keyword:
- Mali, Dogon, honey, edible insects, and water lilies
- Citation to related publication:
- Moran, Steven & Forkel, Robert & Heath, Jeffrey (eds.) 2016. Dogon and Bangime Linguistics. Jena: Max Planck Institute for the Science of Human History. http://dogonlanguages.org
- Discipline:
- Humanities
-
- Creator:
- Heath, Jeffrey
- Description:
- These videos were produced in the course of linguistic fieldwork in central Mali. They are presented here in multiple video formats. The cattle herders par excellence in the zone are traditional Fulbe, who enter towns and Dogon villages to sell fresh and curdled milk along with butter.
- Keyword:
- Mali, Fulbe, cattle herding, and curdled milk
- Citation to related publication:
- Moran, Steven & Forkel, Robert & Heath, Jeffrey (eds.) 2016. Dogon and Bangime Linguistics. Jena: Max Planck Institute for the Science of Human History. http://dogonlanguages.org
- Discipline:
- Humanities
-
- Creator:
- Heath, Jeffrey
- Description:
- These are documentaries made in the course of linguistic fieldwork in central Mali. Most are presented here in three different video formats. All of those in the present group are of Dogon people. Beni village near Douentza figures in many of them. "Cooked spiced millet with roselle leaves" and "steamed cowpeas with millet" are from Walo village. "Cream of millet with tamarind" is from Bendiely village. "Beer brewing" is from Yanda village. "Groundnuts roasted and boiled" is from near Sévaré. "Macari" is from Kowo village near Sévaré. See also the separate works "Central Mali agriculture documentaries" and "Central Mali herding and dairy documentaries".
- Keyword:
- Mali, Dogon, food preparation, and beer brewing
- Citation to related publication:
- Moran, Steven & Forkel, Robert & Heath, Jeffrey (eds.) 2016. Dogon and Bangime Linguistics. Jena: Max Planck Institute for the Science of Human History. http://dogonlanguages.org
- Discipline:
- Humanities
-
- Creator:
- Welling, Daniel and Walsh, Brian
- Description:
- The goal of this simulation was to examine the spread of magnetic reconnection across the dayside magnetopause upon the arrival of a tangential discontinuity of the interplanetary magnetic field from a purely northward to southward configuration. Simple solar wind conditions were used to give us input into the system. A very high resolution grid setup was used in BATS-R-US.
- Keyword:
- space science, magnetosphere, magnetohydrodynamics, magnetopause, and magnetic reconnection
- Citation to related publication:
- Walsh, B. M., Welling, D. T.,Zou, Y., & Nishimura, Y. (2018). A maximum spreading speed for magnetopause reconnection. Geophysical Research Letters, 45, 5268–5273. https://doi.org/10.1029/2018GL078230
- Discipline:
- Science
-
- Creator:
- Ward, Jamie L ., Flanner, Mark G., Bergin, Mike, Dibb, Jack E., Polashenski, Chris M., Soja, Amber J., and Thomas, Jennie L.
- Description:
- Biomass burning produces smoke aerosols that are emitted into the atmosphere. Some smoke constituents, notably black carbon (BC), are highly effective light-absorbing aerosols (LAA). Emitted LAA can be transported to high albedo regions like the Greenland Ice Sheet (GrIS) and affect local snowmelt. In the summer, the effects of LAA in Greenland are uncertain. To explore how LAA affect GrIS snowmelt and surface energy flux in the summer, we conduct idealized global climate model simulations with perturbed aerosol amounts and properties in the GrIS snow and overlying atmosphere. The in-snow and atmospheric aerosol burdens we select range from background values measured on the GrIS to unrealistically high values. This helps us explore the linearity of snowmelt response and to achieve high signal-to-noise ratios. With LAA operating only in the atmosphere, we find no significant change in snowmelt due to the competing effects of surface dimming and tropospheric warming. Regardless of atmospheric LAA presence, in-snow BC-equivalent mixing ratios greater than ~60 ng/g produce statistically significant snowmelt increases over much of the GrIS. We find that net surface energy flux changes correspond well to snowmelt changes for all cases. The dominant component of surface energy flux change is solar energy flux, but sensible and longwave energy fluxes respond to temperature changes. Atmospheric LAA dampen the magnitude of solar radiation absorbed by in-snow LAA when both varieties are simulated. In general, the significant melt and surface energy flux changes we simulate occur with LAA quantities that have never been recorded in Greenland.
- Keyword:
- climate, Greenland Ice Sheet, black carbon, biomass burning, snowmelt, and surface energy balance
- Citation to related publication:
- Ward, J.L., et al. (2018). Modeled Response of Greenland Snowmelt to the Presence of Biomass Burning-Based Absorbing Aerosols in the Atmosphere and Snow. Journal of Geophysical Research: Atmospheres. 123, 6122– 6141. https://doi.org/10.1029/2017JD027878
- Discipline:
- Science