1,053 research outputs found
Training Parse Trees for Efficient VF Coding
No full textWe address the problem of improving variable-length-to-fixed-length codes (VF codes), which have favourable properties for fast compressed pattern matching but moderate compression ratios. Compression ratio of VF codes depends on the parse tree that is used as a dictionary. We propose a method that trains a parse tree by scanning an input text repeatedly, and we show experimentally that it improves the compression ratio of VF codes rapidly to the level of state-of-the-art compression methods
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Foundations of Virtual Fencing: Economics of Virtual Fence (VF) Systems
No full textThis analysis explores the economic considerations of investing in virtual fence (VF) systems, examining their application for representative cow-calf operations under different operating conditions. Virtual fencing (VF) is a tool for livestock management that uses collars and a radio or cellular systems to influence the movement of livestock using auditory and electrical cues (Antaya et al. 2024). Users program the system to establish invisible barriers on a landscape. The system detects the location of animals and if animals approach or cross a “virtual” fence, they receive an auditory or electrical cue encouraging them to move away from the barrier. VF systems have the potential to offset physical fencing costs, enable adoption of adaptive management practices (Boyd et al. 2022; Boyd et al. 2023; Golinski et al. 2023; Verdon et al. 2021), and save ranchers time in locating animals, among other benefits (Campbell et al. 2018; Boyd et al. 2022; Schillings et al. 2024). Commercial VF systems have varying fee structures and require labor to operate which is an additional cost of adoption. Cost and economies of scale are factors that affect livestock producers’willingness to adopt technologies (Pruitt et al. 2012; Lima et al. 2018).This material is based upon work that is supported by the National Institute of Food and Agriculture, U.S. Department of Agriculture, under award number 2021-38640-34695 through the Western Sustainable Agriculture Research and Education program under project number WPDP22-016. USDA is an equal opportunity employer and service provider. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture. This work is supported by the AFRI Foundational and Applied Science Program: Inter-Disciplinary Engagement in Animal Systems (IDEAS) [award no. 2022-10726] from the USDA National Institute of Food and Agriculture. Additional funding for the University of Arizona’s Virtual Fence program was provided by Arizona Experiment Station, the Marley Endowment for Sustainable Rangeland Stewardship, and Arizona Cooperative Extension
Shortening of CPR time before the defibrillation worsens the outcome in out-of-hospital VF patients
No full textObjective: To investigate the influence of cardiopulmonary resuscitation (CPR) time before the first defibrillation.
Methods: The present study retrospectively analyzed the Utstein template records from April 1, 2002 to June 30, 2005. Patients who had out-of-hospital witnessed cardiac arrest caused by cardiac disease and who presented with ventricular fibrillation (VF) as the initial cardiac rhythm were included in the study. Before April 1, 2003, the emergency medical technician (EMT) needed to obtain telephone permission before attempting defibrillation, and CPR was continued until permission was received (CPR first). On and after April 1, 2003, the EMT was immediately able to attempt a defibrillation without obtaining permission (Shock first).
Results: In 143 patients who had out-of-hospital witnessed VF, 43 patients and 100 patients were treated with the CPR first strategy and the Shock first strategy, respectively. The duration of CPR before the first defibrillation was longer in the CPR first group than that in the Shock first group. The CPR first group showed a higher rate of favorable neurological outcome 30 days after (28% vs. 14%, P = .048) and 1 year after cardiac arrest (26% vs. 11%, P = .033) than those of the Shock first group. In the patients with witnessed VF, a stepwise multiple logistic-regression analysis showed the CPR first strategy to improve the neurological outcome.
Conclusions: In patients with out-of-hospital witnessed VF, sufficient CPR before the first defibrillation is considered to improve the neurological outcome in comparison to the performance of immediate defibrillation
Representaciones sociales sobre violencia familiar de operadores policiales de Lima Metropolitana
No full textThis is a preliminary qualitative study on social representations (SR) family violence (FV) of VF policemen serving in Lima Women Police Stations. Objective: To determine the VF RS policemen having women police stations in Lima. Methodology: Qualitative study of transversal in the world of police operators working in three women’s police stations and serve complaints about VF . Interview with 24 operators and the word association technique in group sessions informed consent was used. The data to descriptive and specific analysis of the relevant variables in the study underwent. The main results showed that the figurative nucleus or core of the RS of the VF is related to aggression and abuse as attributes associated beatings, insults, humiliations; observed a prevalence of psychological violence as a representative of family violence.Se trata de un estudio preliminar de tipo cualitativo sobre las representaciones sociales (RS) de la violencia familiar (VF) de policías que atienden VF en las Comisarías de Mujeres de Lima. Objetivo: determinar las RS de la VF que tienen los policías de las Comisarías de Mujeres en Lima. Metodología: estudio cualitativo de tipo transversal en el universo de operadores policiales que trabajan en tres Comisarías de Mujeres y atienden denuncias sobre VF. Se utilizó la entrevista a 24 operadoras así como la técnica de asociación de palabras en sesiones grupales previo consentimiento informado. Los datos se sometieron al análisis descriptivo y específico de las variables relevantes del estudio. Los resultados más relevantes arrojaron que el núcleo figurativo o núcleo central de las RS de la VF es la agresión relacionada con el maltrato y como atributos asociados los golpes, insultos, humillaciones; observándose un predominio de la violencia psicológica como representante de la violencia familiar
An Efficient Algorithm for Almost Instantaneous VF Code Using Multiplexed Parse Tree
No full textAlmost Instantaneous VF code proposed by Yamamoto and Yokoo in 2001, which is one of the variable-length-to-fixed-length codes, uses a set of parse trees and achieves a good compression ratio. However, it needs much time and space for both encoding and decoding than an ordinary VF code does. In this paper, we proved that we can multiplex the set of parse trees into a compact single tree and simulate the original encoding and decoding procedures. Our technique reduces the total number of nodes into O(2ℓk - k2), while it is originally O(2ℓk), where ℓ and k are the codeword length and the alphabet size, respectively. The experimental results showed that we could encode and decode over three times faster for natural language texts by using this technique
EMISSION SPECTROSCOPY AND AB INITIO CALCULATIONS ON VCl AND VF
No full textAuthor Institution: Department of Chemistry, University of Arizona; Laboratoire de Chimie Physique Mol\'{e}culaire, Universit\'{e} Libre de Bruxelles; Department of Chemistry, University of Waterloo; Department of Physics, University of CaliforniaThe emission spectra of VCl and VF have been investigated in the region using a Fourier transform spectrometer. The bands were excited in a high temperature carbon tube furnace from the reaction of vanadium metal vapors with and , respectively. The VF bands were also observed in a microwave discharge through a flowing mixture of vapor and helium. The VCl bands with high wavenumber R heads near 6176.0, 6589.6, 7004.1, 7358.2 and have been assigned as the 0-2, 0-1, 0-0, 1-0 and 2-0 bands of the electronic transition while the VF bands with R heads near 9156.8, 9816.4, 10481.4, 11035.8 and have been assigned as the 0-2, 0-1, 0-0, 1-0 and 2-0 bands, respectively, of the transition. A rotational analysis of the and subbands of several bands of VCl and VF has been carried out and spectroscopic parameters have been obtained. Equilibrium constants of and {\AA} have been obtained for the ground state of VCl, while equilibrium constants of and {\AA} have been determined for the ground state of VF. The spectroscopic properties of the low-lying electronic states of VCl have also been predicted by ab initio calculations. Our electronic assignments are supported by the results of our ab initio calculations
Accounting and analytical support and audit of financial results formation in enterprises on the example of PJSC «VF Ukraine»
No full textУ роботі розглядаються теоретичні аспекти обліково-аналітичного забезпечення
формування та аудиту фінансових результатів підприємств.
Проаналізовано особливості системи обліково-аналітичного забезпечення
управління фінансовими результатами та проведення аудиту на прикладі ПрАТ «ВФ
Україна», включаючи фінансовий аналіз та економіко-математичне моделювання стану
фінансових результатів.
Запропоновано шляхи вдосконалення системи обліково-аналітичного забезпечення
формування та аудиту фінансових результатів на прикладі ПрАТ «ВФ Україна» для
підвищення ефективності управління фінансовими показниками.The work deals with the theoretical aspects of accounting and analytical support for the
formation and audit of financial results of enterprises.
Author analysis the specific features of the accounting and analytical support system for
managing financial results and conducting audits, on the example of PJSC "VF Ukraine,"
incorporating financial analysis and economic-mathematical modeling of financial results.
Author offers ways to enhance the system of accounting and analytical support and audit
of financial results to improve the efficiency of financial management at PJSC "VF Ukraine.
Addressing Unmodeled Path-Following Dynamics via Adaptive Vector Field: A UAV Test Case
No full textThe actual performance of model-based path-following methods for unmanned aerial vehicles (UAVs) shows considerable dependence on the wind knowledge and on the fidelity of the dynamic model used for design. This study analyzes and demonstrates the performance of an adaptive vector field (VF) control law which can compensate for the lack of knowledge of the wind vector and for the presence of unmodeled course angle dynamics. Extensive simulation experiments, calibrated on a commercial fixed-wing UAV and proven to be realistic, show that the new VF method can better cope with uncertainties than its standard version. In fact, while the standard VF approach works perfectly for ideal first-order course angle dynamics (and perfect knowledge of the wind vector), its performance degrades in the presence of unknown wind or unmodeled course angle dynamics. On the other hand, the estimation mechanism of the proposed adaptive VF effectively compensates for wind uncertainty and unmodeled dynamics, sensibly reducing the path-following error as compared to the standard VF.Accepted Author ManuscriptTeam Bart De SchutterShip Design, Production and Operation
Acute effect of intensity and volume during strength training on sensation of pleasure, rating of perceived exertion, and pain in trained men
No full textPurpose. The purposes of this study were: (a) to compare the sensation of pleasure, rating of perceived exertion (RPE), and pain in different volumes (volitional failure [VF] vs. fixed repetitions [FR]), equalizing the intensity; and (b) to compare the sensation of pleasure, RPE, and pain in different intensities (40%, 60%, and 80%) of one-repetition maximum (1RM), with equalization of training volume. Methods. A total of 12 trained men (aged 24.9 ± 4.3 years) performed 3 sets of seated row, leg press 180°, and chest press at 3 different intensities (40%, 60%, and 80% 1RM) for both training strategies (VF vs. FR). Results. There was a decrease in pleasure and an increase in RPE and pain in VF training sessions at intensities of 40% and 60% 1RM compared with FR. However, no difference was observed for the intensity of 80% 1RM for pleasure. A doseresponse effect was revealed in the comparison of intensities for pain and RPE. In turn, no effect was found for pleasure. Conclusions. VF training sessions decreased responses regarding pleasure, as well as increased RPE and perceived pain for the intensities of 40% and 60% 1RM when compared with the same intensity in FR among trained men. Different intensities were not able to change the sensation of pleasure
Binary Variable-to-Fixed Length Balancing Scheme with Simple Encoding/Decoding
No full textWe present a systematic variable-to-fixed (VF) length scheme encoding binary information sequences into binary balanced sequences. The redundancy of the proposed scheme is larger than the redundancy of the best fixed-to-fixed (FF) length schemes in case of long codes, but it is smaller in case of short codes. The biggest advantage comes from the simplicity of the scheme: encoding only requires one to keep track of the sequence weight, while decoding requires only one extremely simple step, irrespective of the sequence length.Accepted Author ManuscriptDiscrete Mathematics and Optimizatio
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