118,833 research outputs found
A Synchronization Library for ASIM
No full textThis memo describes the functions in the synchronization library provided for programs written for ASIM and acts as a user's manual. Mul-T provides futures and binary semaphores as primitive synchronization mechanisms. For experimenting with other synchronization constructs, we have extended the language to include J-structures, L-structures, mutualexclusion locks, counting semaphores and barriers. An extension of futures to allow thread placement directives is also provided. 1 Introduction A synchronization library is provided in ASIM for users to experiment with various synchronization mechanisms. This memo assumes knowledge of programming in the ASIM environment. See Alewife Memo 13 for a description of the ASIM environment. The library contains implementations of mutual-exclusion locks, counting semaphores, Jstructures, L-structures, and barriers. These supplement the synchronization mechanisms already present in Mul-T on ASIM, viz., futures, and binary semaphores. This memo will b..
Relocation of the Atmosphere-Space Interactions Monitor (ASIM) on the International Space Station
No full textThe Atmosphere-Space Interactions Monitor (ASIM) is a 314-kilogram external payload attached to the Columbus module of the International Space Station (ISS). It was developed by the European Space Agency (ESA) and the main objective of ASIM is the study of the upper layers of the atmosphere and in particular, phenomena known as Transient Luminous Events and Terrestrial Gamma-ray Flashes. On board since April 2018, ASIM has produced outstanding science. ASIM mission was supposed to end in December 2021 when another payload was programmed to use its location. With its excellent health and science output, the idea was put forward to relocate ASIM somewhere else on the station instead of simply removing and trashing it. With very little lead time, the ground teams managed to overcome all the hurdles to make this relocation possible. From a nadir viewing payload, designed to monitor the top of thunderstorms, ASIM has become a limb viewing one since January 2022. Remarkably, a limb viewing instrument was in the original plans for ASIM, but was descoped for financial reasons. The science produced at this new location is therefore quite complementary to the original location
Documentation of the Central and Eastern European Countries Agricultural Simulation Model (CEEC-ASIM Version 1.0)
No full textThe Central and Eastern European Countries Agricultural Simulation Model (CEEC-ASIM) has been developed at IAMO. It is a partial equilibrium model for the agricultural sectors of 14 countries including demand of domestic consumers and is designed to analyse the impacts of agricultural policies on important target variables like producer and consumer prices, supply and input demand of agriculture, food demand, net trade and welfare. Particular efforts were undertaken to implement also the policy instruments of the Common Agricultural Policy of the European Union. These besides the market price support measures also include the different forms of domestic support as for example area payments and beef premiums. Also the set-aside obligations and production quotas can be taken into account. This discussion paper serves as a model documentation and describes the structure of the model along with the basic modelling assumptions. The model is essentially based on neoclassical theory. The main hypotheses are perfect markets, profit maximisation of producers and utility maximisation of consumers. -- G E R M A N V E R S I O N: Das Central and Eastern European Countries Agricultural Simulation Model (CEEC-ASIM) ist am IAMO entwickelt worden. Es ist ein partiales Gleichgewichtsmodell für die Agrarsektoren von 14 Ländern und umfasst auch die Nachfrage der Verbraucher. Insbesondere ist es für die Analyse der Auswirkungen von Agrarpolitiken auf wichtige Zielgrößen wie die Erzeuger- und Verbraucherpreise, Angebots- und Faktornachfragemengen der Landwirtschaft, Konsumentennachfrage, Nettohandel und Wohlfahrt erstellt worden. Besondere Anstrengungen sind unternommen worden, die Instrumente der Gemeinsamen Agrarpolitik der Europäischen Union in das Modell einzubeziehen. Diese umfassen neben den Maßnahmen der Marktpreisstützung auch verschiedene Formen der internen Stützung wie zum Beispiel die Flächenzahlungen und Prämien im Rindfleischbereich. Auch können Flächenstilllegungsverpflichtungen sowie Produktionsquoten berücksichtigt werden. Dieses Diskussionspapier dient als Dokumentation und beschreibt die Struktur des Modells sowie die grundlegenden Modellannahmen. Das Modell basiert im Wesentlichen auf der neoklassischen Theorie. Die zentralen Hypothesen sind vollständige Märkte, gewinnmaximierende Produzenten und nutzenmaximierende Konsumenten.Sector Modelling,Agricultural Sector,Partial Equilibrium Model,Policy Analyses,Sektormodellierung,Agrarsektor,partielles Gleichgewichtsmodell,Politik Analyse
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Frequency-domain analysis and optimisation of linear networks
No full textThe objective of the research conducted in this thesis is the development of a package for computer-aided frequency-domain analysis and optimisation of large-scale linear electrical networks on a small interactive computer. To enable the implementation of such a package on asmall machine, and for efficient analysis, the network under consideration must be described in terms of nested subnetworks. In this case the required network analysis may be carried in a hierarchical fashion; starting with the smallest (or deepest) subnetwork and ending with the whole given network. The calculation of the admittance parameters of the equivalent three-pole of each de-nested subnetwork is central to the scheme. This is achieved in an efficient manner by using a suitable partitioning strategy whereupon an L-U factorisation technique, with its attendant forward and backward substitutions, is used to solve for the required admittance parameters. From these admittance parameters many other network functions are readily derived. The other possible analysis using the present package is the first-order linear network sensitivity analysis. A new scheme to allow this analysis to be carried out for networks including nested subnetworks is described. This scheme relies, for its efficiency, on the results of the a.c. analysis using the L-U factorisation technique, and on the use of the adjoint network concept. The implementations of this integrated scheme of analyses proved it to be both efficient and reliable optimisation of this category of networks to voltage-gain Modulus and/or Phase output specifications is carried out using an existing nonlinear programming algorithm. An appropriate transformation of design variables enables the use of an unconstrained minimisation of a least-square type of error function, to solve the optimisation problem. The user is allowed to define the performance specifications either as an upper and lower bound, or as a spot-on value, at each frequency point of interest. Since the use of gradient information enhances the speed of convergence of the minimisation process, the analyses algorithm in our package calculates the gradient vector and passes this information to the optimisation routine. From this gradient information, the latter calculates an initial estimate of the Hessian matrix. Several examples of network simulation and optimisation are introduced to demonstrate both the capababilities and efficiency of the package.</p
Square Dancing with the Stars to Enhance Dynamic Hirschman Linkages?
No full textIn this Presidential Address, the author takes the reader on a reconnaissance of his life and time as a regional scientist. He points out scenery he found scintillating along the way, hoping that some may pick up the banner and chew on a few of the ideas for a while. He suggests a revisit to Albert O. Hirschman’s notion of key sectors and more empirical analysis related to Marcus Berliant’s and Masahisa Fujita’s notion of knowledge creation and transfer.Presidential Address, San Antonio, Texas, March 29, 2014 (53rd Meetings of the Southern Regional Science Association
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Letter from unknown writer to Jesse L. Boyce
No full textLetter to Jesse L. Boyce from unknown author (possibly Jack) about the investigation into the powder magazine located in the Grand Canyon. Some personal news is included in the letter such as the writer's marriage to the daughter of C.A. Taylor, former Supervisor of Cochise County
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Sarah L. Blum Author Visit - Warrior Nurse: PTSD and Healing
No full textHear Sarah L. Blum, author of Women Under Fire: Abuse in the Military, discuss her newest book, Warrior Nurse: PTSD and Healing followed by a Q&A and book signing.
Sarah L. Blum is a decorated Vietnam veteran who served as an operating room nurse during the intense fighting of 1967. In recognition of her service, she was awarded the Army Commendation Medal.
Sponsored by CWU Veterans Center and CWU Libraries.https://digitalcommons.cwu.edu/libraryevents/1252/thumbnail.jp
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