178 research outputs found
The ontogeny of asymmetry in echolocating whales
No full textAccepted proof of manuscript:
Lanzetti Agnese, Coombs Ellen J., Portela Miguez Roberto, Fernandez Vincent and Goswami Anjali (2022)
The ontogeny of asymmetry in echolocating whales. Proc. R. Soc. B. 289: 20221090
https://doi.org/10.1098/rspb.2022.109
Introducing Microcells into Macrocellular Networks: A Case Study
No full textAbstract?The performance in terms of signal-to-interference ratio (SIR), teletraffic, and spectral efficiency of a combined macrocellular and microcellular network is investigated when either both types of cells share the same channel set, or when the channel set is partitioned between the macrocells and the microcells. The analysis is for time-division multiple access (TDMA) with frequency hopping, power control, and discontinuous transmission, and the radio channel is composed of an inverse fourth-power path loss law with log-normal fading. We commence by introducing a single microcell into a hexagonal cluster of macrocells before considering clustered microcells. Both omni-directional and sectorized cells are examined. We find that high reuse factors are required when channel sharing is employed. When channel partitioning is used, no co-channel interference occurs between the microcells and the macrocells allowing them to be planned independently. The reuse factors in the microcells and macrocells therefore do not need to be increased beyond conventional values. The outcome is that by opting for channel partitioning, the improvement in spectral efficiency compared to channel sharing is two to three times greater. Index Terms?Co-channel interference, land mobile radio cel-lular systems, time division multiaccess
Combining simulation modeling and stable isotope analyses to reconstruct the last known movements of one of Nature’s giants
No full textThe spatial ecology of rare, migratory oceanic animals is difficult to study directly. Where incremental tissues are available, their chemical composition can provide valuable indirect observations of movement and diet. Interpreting the chemical record in incremental tissues can be highly uncertain, however, as multiple mechanisms interact to produce the observed data. Simulation modeling is one approach for considering alternative hypotheses in ecology and can be used to consider the relative likelihood of obtaining an observed record under different combinations of ecological and environmental processes. Here we show how a simulation modeling approach can help to infer movement behaviour based on stable carbon isotope profiles measured in incremental baleen tissues of a blue whale (Balaenoptera musculus). The life history of this particular specimen, which stranded in 1891 in the UK, was selected as a case study due to its cultural significance as part of a permanent display at the Natural History Museum, London. We specifically tested whether measured variations in stable isotope compositions across the analysed baleen plate were more consistent with residency or latitudinal migrations. The measured isotopic record was most closely reproduced with a period of residency in sub-tropical waters for at least a full year followed by three repeated annual migrations between sub-tropical and high latitude regions. The latitudinal migration cycle was interrupted in the year prior to stranding, potentially implying pregnancy and weaning, but isotopic data alone cannot test this hypothesis. Simulation methods can help reveal movement information coded in the biochemical compositions of incremental tissues such as those archived in historic collections, and provides context and inferences that are useful for retrospective studies of animal movement, especially where other sources of individual movement data are sparse or challenging to validate.© 2019 Trueman et al.
This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.NHM Repositor
Chronic hepatitis C associated with Coombs-positive hemolytic anemia
No full textHepatitis C virus (HCV) is a recognized cause of significant extrahepatic disease. Induction of autoimmune hemolytic anemia (AIHA) has been reported, either during or after interferon (IFN) treatment of HCV infection. We herein report a 56-year-old patient with HCV infection who developed severe Coombs-positive AIHA in the absence of treatment with IFN. Prednisone therapy was initiated, but intravenous immunoglobulins were added because of persistent hemolysis. Clinical course was complicated by rapid deterioration and the development of Creutzfeldt-Jakob disease. Having discarded other possible causes of AIHA, we suggest a possible association between AIHA and infection by HCV. © 2004 The European Hematology Association All right reserved.BARBOLLA L, 1993, VOX SANG, V65, P156; BJORKHOLM M, 1993, J INTERN MED, V234, P119; Chao TC, 2001, J CLIN GASTROENTEROL, V33, P232, DOI 10.1097-00004836-200109000-00014; de-la-Serna-Higuera C, 1999, J CLIN GASTROENTEROL, V28, P358, DOI 10.1097-00004836-199906000-00017; FLORES G, 1993, AM J HEMATOL, V44, P237, DOI 10.1002-ajh.2830440404; HYMAN GA, 1956, AM J MED SCI, V221, P448; JEFFERIES LC, 1994, HEMATOL ONCOL CLIN N, V8, P1087; PANUSH RS, 1973, GASTROENTEROLOGY, V64, P1015; PORTELL A, 1982, REV CLIN ESP, V64, P101; Ramos-Casals M, 2003, MEDICINE, V82, P87, DOI 10.1097-00005792-200303000-00003; Sandler SG, 2002, CURR OPIN HEMATOL, V9, P509, DOI 10.1097-01.MOH.0000034927.52450.9A; Srinivasan R, 2001, J CLIN GASTROENTEROL, V32, P245, DOI 10.1097-00004836-200103000-00015; TAKASE K, 1995, J GASTROENTEROL, V30, P795, DOI 10.1007-BF02349651; Zignego AL, 1999, J HEPATOL, V31, P369, DOI 10.1016-S0168-8278(99)80239-675
TRADING FINANCIAL INSTRUMENTS LIKE A VIDEO GAME: SEARCHING FOR PROFIT USING DEEP REINFORCEMENT LEARNING.
No full textBuying and selling Stocks, Foreign Currencies (FOREX), Commodities, and Cryptocurrencies have been a source of wealth generation, and more often, wealth loss for many brave enough to enter the financial markets. In this paper, the author builds on the work of Williams, J. 2022 and develops an agent-based method to solve this wealth generation problem with the use of neural networks. The author points out some assumptions made by Williams, J. 2022 that were sound in theory, but made the implementation of the algorithm presented in their paper diverge from the theory. The author proposes a fundamentally different algorithmic method, called Double Deep Q learning, to trade in financial markets. This method, in the category of reinforcement learning, was popularized when teaching computers how to play video games such as Atari Space Invaders and Pong. The author creates an environment wherein the markets are treated like a video game and an agent learns to find the optimal path through the market to maximize its rewards. The author presents a final algorithm using two (2) interlinked LSTM Recurrent Neural Networks to form a Double Deep Recurrent Q network (DDRQN) algorithm and uses that algorithm to make profitable decisions and secure overall profits in foreign currency exchange markets
User producer interaction in context: A classification
No full textScience, Technology and Innovation Studies show that intensified user producer interaction (UPI) increases chances for successful innovations, especially in the case of emerging technology. It is not always clear, however, what type of interaction is necessary in a particular context. This paper proposes a conceptualization of contexts in terms of three dimensions – the phase of technology development, the flexibility of the technology, and the heterogeneity of user populations – resulting in a classification scheme with eight different contextual situations. The paper identifies and classifies types of interaction, like demand articulation, interactive learning, learning by using and domestication. It appears that each contextual situation demands a different set of UPI types. To illustrate the potential value of the classification scheme, four examples of innovations with varying technological and user characteristics are explored: the refrigerator, clinical anaesthesia, video cassette recording, and the bicycle. For each example the relevant UPI types are discussed and it is shown how these types highlight certain activities and interactions during key events of innovation processes. Finally, some directions for further research are suggested alongside a number of comments on the utility of the classification.Innovation, users, interaction, learning, typology of UPI
The University of Utah College of Law Introduces Its 1964 Graduating Class
No full textPhotographs and profiles of 55 graduates: Joel M. Allred, M. Matt Bijanic, Maurice R. Barnes Jr., David R. Bowen, Wendell E. Bennett, Clark O. Bray, Joseph P. Biafore Jr., Lynn R. Brown, Robert E. Clark, Jeanette C. Douglas, Alan Coombs, Kent C. Dugmore, Robert John Derby [sic, Robert John DeBry], Glen J. Ellis, Edgar M. Denny, James R. Gillespie, Howard C. Hall, George E. Holt, Morgan D. Harris, John H. Laub, V. Devoe Heaton, Kay M. Lewis, M. Blaine Hofeling, John Henry McDonald, Earl S. Maeser, C. Blaine Morley, Carl E. Malouf, Monte J. Morris, O. Robert Meredith, Douglas D. Moscrip, Robert D. Merrill, Hans M. Morrow, Robert W. Mullen, Robert F. Orton, Alvin G. Nash, Douglas Wayne Owens, Robert H. Nelson, Don R. Petersen, Carl J. Nemelka, Delbert Phillips, Tom G. Platis, Keneth W. Smith, Stuart L. Poelman, Don A. Stringham, Richard K. Sager, Stanton M. Taylor, Thomas J. Shreeve, Karl Giles Topham, Frank S. Warner, Randon W. Wilson, Gary Alfred Weston, Noall T. Wooton, Bill White, Leon J. Zanoni, J. Clare Williams. Author of handwritten notes unknown
UHS Class of 1971 Reunion
No full textThe Uintah High School class of 1971 held their reunion at the Vernal Elks Lodge. From Left on back row are: Brent Bascom, John Snyder, unidentified, Jim Richards, Mitch Clark, Neal Sorensen, Charlie Walker, unidentified, unidentified, Rick Riddle, unidentified, unidentified, Brent Bigelow, Valyn Schaefermeyer, Rick Brooks, next three unidentified, Lowell Aycock, Tim Hadlock, unidentified, unidentified. Middle row: unidentified, Vivian Mackay, Ranae Feltch, Debra Steele, Janet Staten, Annette Reynolds, Kathy Stewart, Ellen Hadlock, Karen Coombs, Carol --------, Carma Bascom, Nancy -------, Vicki ---------, Ranena Caldwell, John Richardson, Randy Jackson and Craig Hart. Front row: Gaywin Snow, Wayne Calder, Kelly Boren, Polly Piva, unidentified, Cherilyn Sowards, Steve Reynolds, Randy Beers, Sam Gardiner, Helen Coon, Emily Christiansen, LynEve Wilkins, Susan Horrocks, Creg Wilkins, Whitney Washburn and Gary Reynolds
The hydrodynamic footprint of a benthic, sedentary fish in unidirectional flow
No full textAuthor Posting. © Acoustical Society of America, 2007. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 122 (2007): 1227-1237, doi:10.1121/1.2749455.Mottled sculpin (Cottus bairdi) are small, benthic fish that avoid being swept downstream by orienting their bodies upstream and extending their large pectoral fins laterally to generate negative lift. Digital particle image velocimetry was used to determine the effects of these behaviors on the spatial and temporal characteristics of the near-body flow field as a function of current velocity. Flow around the fish's head was typical for that around the leading end of a rigid body. Flow separated around the edges of pectoral fin, forming a wake similar to that observed for a flat plate perpendicular to the flow. A recirculation region formed behind the pectoral fin and extended caudally along the trunk to the approximate position of the caudal peduncle. In this region, the time-averaged velocity was approximately one order of magnitude lower than that in the freestream region and flow direction varied over time, resembling the periodic shedding of vortices from the edge of a flat plate. These results show that the mottled sculpin pectoral fin significantly alters the ambient flow noise in the vicinity of trunk lateral line sensors, while simultaneously creating a hydrodynamic footprint of the fish's presence that may be detected by the lateral line of nearby fish.This work was funded in part by an NIDCD program project grant to the Parmly Hearing Institute, Loyola University Chicago (W. Yost, PI, S. Coombs, Co-PI)
Developing Purpose in College: A Mixed Methods Study to Investigate How First-year and Senior Students Developed Purpose at a Large Research Midwestern University
No full textThe purpose of this convergent mixed methods study was to investigate how students develop purpose at a large research Midwestern University. More specifically, this study assessed how students developed their sense of purpose in college, according to both first-year students and senior students. The central research question for this study was: how do students develop purpose in college? More specifically, how do first-year students compare with senior college students when developing purpose in college? The Developing Purpose Inventory (DPI), created by William Barratt, was utilized to determine how students were developing purpose in college, according to Arthur Chickering’s student development theory. Students self-selected to participate in a follow-up research interview, which examined in depth how students perceived their development or purpose evolved throughout their college education. The three sections of developing purpose studied were avocational recreational interests, vocational interests, and style of life. One hundred and twenty seven students completed online surveys. The author also conducted semi-structured interviews with three first-year participants and four senior participants who volunteered to complete a follow-up interview after the initial survey. This study showed that students develop purpose between their first-year and senior year of college at a large research Midwestern University. Statistically significant evidence from the DPI suggested that students developed avocational recreational purpose and style of life purpose during college. The DPI also suggested that students develop vocational interests during their academic career. Six qualitative themes also emerged from the qualitative research: he/she believed in me, college as the next step, exploring possibilities, value of experiences and involvement, supporting and helping others, and preparation to do something greater.
Adviser: Richard E. Hoove
- …
