903 research outputs found
ULB17-VT
No full textThis dataset includes Thermal-Visual images with the same aligned geometry taking by FLIR-E60 camera. Images are of size (320 x 240) pixel resolution with 0.05◦C thermal sensitivity and −20◦C to 650◦C. Thermal images were extracted in their raw format and logged in 16-bit float per-pixel in one channel.
The acquisition was made in different scenes and different environments (indoor and outdoor, during winter and summer and with static and moving objects). Thermal and RGB images were manually extracted and annotated with a total of 570 pairs in the original paper.
Due to European regulations about data and privacy protection, Images shows identified faces were excluded from this published version. This published benchmark has 404 pair of images, divided into 280 training samples, 78 validation validation samples and 46 testing samples.
The file 'ULB17-VT.pkl' is saved in Pkl format, using python 3.5 and cPickle.HIGHEST_PROTOCOL and arranged in the following way:
[Train_RGBx, Train_HRx, Train_LRx], [Valid_RGBx, Valid_HRx, Valid_LRx], [Test_RGBx, Test_HRx, Test_LRx]
X_RGBx: Visual RGB image
X_HRx: High-Resolution Thermal image
X_LRx: Low-Resolution 'Gaussian Pyramid' down-sampled Thermal image
This dataset is first presented in the article below, Please cite this paper if the dataset is used in your publication.
@article{almasri2018multimodal,
title={Multimodal Sensor Fusion In Single Thermal image Super-Resolution},
author={Almasri, Feras and Debeir, Olivier},
journal={arXiv preprint arXiv:1812.09276},
year={2018}
}</pre
Eliminating VT uncertainties in modeling ferroresonance phenomena caused by single phase-to-ground faults in isolated neutral network
No full textIt is commonly recognized that correct transformer model (particularly topological one) is a key element for any ferroresonance simulations. This paper represents a line of reasoning by which a reliable model of a voltage transformer (VT) can be constructed given substantial uncertainties in its parameters and characteristics. Starting with catalog data for electric steels and typical leakage inductances of 6-kV VTs, a model of an isolated neutral network with three inductive VTs is initially fitted to reproduce in detail its ferroresonant behavior for a chosen network capacitance. Then, validity of the network model is verified by accurate predictions of ferroresonance processes for all other capacitance values available and thus different ferroresonance modes recorded during full-scale factory tests. Possibilities to simplify the VT model by neglecting dynamic, and then entire core losses and hysteresis are also shown
First intention epicardial VT ablation : what are the results?
No full textPublished on behalf of the European Society of Cardiology. All rights reserved. © The Author(s) 2019. For permissions, please email: [email protected]: Ventricular tachycardia (VT) endocardial mapping and ablation may not be sufficient in several arrhythmogenic contexts, because ventricular myocardium may comprise intricate endocardial, intramural and epicardial substract. Thus, epicardial ablation has lately become a complementary and necessary tool to approach some VTs in different types of cardiomyopathies.info:eu-repo/semantics/publishedVersio
The performance enhancement of multibeam adaptive base-station antennas for cellular land mobile radio systems
No full textThe problem of meeting the proliferating demands for mobile telephony within the confinement of the limited radio spectrum allocated to these services is addressed. A multiple-beam adaptive base-station antenna is proposed as a major system component in an attempt to solve this problem. The approach is demonstrated by employing an antenna array capable of resolving the angular distribution of the mobile users as seen at the base-station site, and then using this information to direct beams toward either lone mobiles, or groupings of mobiles, for both transmit and receive modes of operation. The energy associated with each mobile is thus confined within the addressed volume, greatly reducing the amount of cochannel interference experienced from and by neighboring cochannel cells. To ascertain the benefits of such an antenna, the conventional and proposed antenna systems are modeled in a typical mobile radio environment. For a given performance criterion, the theoretical results indicate that a significant increase in the spectral efficiency, or capacity, of the network is obtainable with the proposed antenn
Enhancing flexibility and strength-to-weight ratio of polymeric stents: A new variable-thickness design approach
No full textThis paper presents a new design strategy to improve the flexibility and strength-to-weight ratio of polymeric stents. The proposed design introduces a variable-thickness (VT) stent that outperforms conventional polymeric stents with constant thickness (CT). While polymeric stents offer benefits like flexibility and bioabsorption, their mechanical strength is lower compared to metal stents. To address this limitation, thicker polymer stents are used, compromising flexibility and clinical performance. Leveraging advancements in 3D printing, a new design approach is introduced in this study and is manufactured by the Liquid Crystal Display (LCD) 3D printing method and PLA resin. The mechanical performance of CT and VT stents is compared using the Finite Element Method (FEM), validated by experimental tests. Results demonstrate that the VT stent offers significant improvements compared to a CT stent in bending stiffness (over 20%), reduced plastic strain distribution of expansion (over 26%), and increased radial strength (over 10%). This research showcases the potential of the VT stent design to enhance clinical outcomes and patient care.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Materials and Environmen
An Evaluation of Next Generation Rocket Engines for VT SSTO RLV
No full textObserving that the majority of SSTO programs failed due to the propulsion system being far ahead of its time. Furthermore, acknowledging the that the private launch markets is increasingly dominated by partly reusable TSTOs. This thesis aims to evaluate whether next generation rocket engines make an SSTO viable within a foreseeable economical time frame, for the increasingly privatised space industry. From the market analysis it follows that the VT SSTO RLV developed by the private launch industry, with a payload capability of 15- 20 tons to a LEO with an altitude of 200-400 km, is most likely. The evaluation is performed by a two level trade-off. Initially, a literature trade-off is preformed on elaborate range of potential next generation rocket engine, which are subdivided into pure rocket engine and breathing engine. All engines are evaluated on the market requirements, performance, and achievability. Only three engine types are selected. Upon evaluating the propulsion literature it was noticed that no literature cross evaluated advanced propulsion systems with high performance propellant pallets. Therefore, a literature propellant trade-off is performed. For the aerospike, the pulse detonation engine and the precooled hybrid airbreathing rocket engine with the propellant pallets H2/O2, CH4/O2, C2H2/O2, and C2H4/O2 a performance analysis is performed. The performance analysis is done by both optimising the engine configurations and the ascent trajectory for a 15 ton payload delivery to an orbit of 400 km altitude. To simulate each engine, three performance analysis are developed, which are all derived from the continuity equations to ensure a consistent comparison. The aerospike is simulated as a continuous optimal convectional via the frozen equilibrium method, although it is found an alternation is needed to account for directional losses. The open-end of the PDE is simulated via a CJ-detonation wave followed by an exponential decaying blowdown phase. The DC nozzle expansion is iteratively simulated via the frozen equilibrium method. The intake and HPC of the precooled hyrbid airbreathing engine is simulated with convectional aero engine performance analysis, while the precooler is simulated ass a counter-flow heat exchanger. The CC and CD nozzle are simulated via the frozen equilibrium method. From the optimised trajectory the representative performance of each engine is extracted and five engine configurations are identified as viable VT SSTO RLV engines. These are the H2/O2 powered aerospike, the pulse detonation engine and the precooled hybrid airbreathing rocket engine operating on an H2/O2 pallet, and the C2H2/O2 powered aerospike and pulse detonation engine. The H2/O2 powered PDE is found to be the most promising, as it offers the best performance gain relative to its achievability. Therefore, it advocates that future VT SSTO RLV research utilises the H2/O2 powered pulse detonation engine as the main propulsion systemAerospace Engineerin
Assessing Semi-Autonomous Waterborne Platooning Success Factors in Urban Areas
No full textA waterborne platooning concept, i.e. a Vessel Train (VT) it is composed of a fully manned lead vessel that takes over navigational responsibility for the followers. Joining a VT helps improve the competitiveness of smaller vessels and increase their use, as it allows a vessel to sail continuously with a small crew. This paper identifies the challenges created when penetrating urban areas and models the viability of the VT. The influence factors of the implementation hinge on the maximum opening times and on the simultaneous opening of adjacent bridges. The results provide guidelines for a successful integration of the semi-autonomous platooning system in urban areas.Ship Design, Production and Operation
Targeting of CYP17A1 Lyase by VT-464 Inhibits Adrenal and Intratumoral Androgen Biosynthesis and Tumor Growth of Castration Resistant Prostate Cancer
No full textCytochrome P450 17α-hydroxylase/17,20-lyase (CYP17A1) is a validated treatment target for the treatment of metastatic castration-resistant prostate cancer (CRPC). Abiraterone acetate (AA) inhibits both 17α-hydroxylase (hydroxylase) and 17,20-lyase (lyase) reactions catalyzed by CYP17A1 and thus depletes androgen biosynthesis. However, coadministration of prednisone is required to suppress the mineralocorticoid excess and cortisol depletion that result from hydroxylase inhibition. VT-464, a nonsteroidal small molecule, selectively inhibits CYP17A1 lyase and therefore does not require prednisone supplementation. Administration of VT-464 in a metastatic CRPC patient presenting with high tumoral expression of both androgen receptor (AR) and CYP17A1, showed significant reduction in the level of both dehydroepiandrosterone (DHEA) and serum PSA. Treatment of a CRPC patient-derived xenograft, MDA-PCa-133 expressing H874Y AR mutant with VT-464, reduced the increase in tumor volume in castrate male mice more than twice as much as the vehicle (P < 0.05). Mass spectrometry analysis of post-treatment xenograft tumor tissues showed that VT-464 significantly decreased intratumoral androgens but not cortisol. VT-464 also reduced AR signaling more effectively than abiraterone in cultured PCa cells expressing T877A AR mutant. Collectively, this study suggests that VT-464 therapy can effectively treat CRPC and be used in precision medicine based on androgen receptor mutation status. © 2016 The Author(s)
Fundamentals of Business, Second Edition
No full textFundamentals of Business, Second Edition (2018) is an 372-page open education resource intended to serve as a no-cost, faculty customizable primary text for one-semester undergraduate introductory business courses. It covers the following topics in business: Teamwork; economics; ethics; entrepreneurship; business ownership, management, and leadership; organizational structures and operations management; human resources and motivating employees; managing in labor union contexts; marketing and pricing strategy; hospitality and tourism, accounting and finance, and personal finances. The textbook was designed for use in Virginia Tech’s Pamplin College of Business introductory level business course, MGT1104 Foundations of Business and is shared under a Creative Commons Non-Commercial ShareAlike 4.0 license.
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This work is a project of the Pamplin College of Business and University Libraries at Virginia Tech. This work is published by VT Publishing.
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Table of contents
Chapter 1: Teamwork in Business
Chapter 2: The Foundations of Business
Chapter 3: Economics and Business
Chapter 4: Ethics and Social Responsibility
Chapter 5: Business in a Global Environment
Chapter 6: Forms of Business Ownership
Chapter 7: Entrepreneurship: Starting a Business
Chapter 8: Management and Leadership
Chapter 9: Structuring Organizations
Chapter 10: Operations Management
Chapter 11: Motivating Employees
Chapter 12: Managing Human Resources
Chapter 13: Union/Management Issues
Chapter 14: Marketing: Providing Value to Customers
Chapter 15: Pricing Strategy
Chapter 16: Hospitality and Tourism
Chapter 17: Accounting and Financial Information
Chapter 18: Personal Finances
Suggested citation
Skripak, Stephen J. (2018). Fundamentals of Business, 2nd Edition, Blacksburg, VA: VT Publishing. http://hdl.handle.net/10919/84848. Licensed with CC BY-NC-SA 4.0 <a href="https://creativecommons.
org/licenses/by-nc-sa/4.0">https://creativecommons.org/licenses/by-nc-sa/4.0.
Contributors: Anastasia Cortes, Gary Walton, Richard Parsons, Anita Walz
Digital and print production: Corinne Guimont with Robert Browder
Alternative text and accessibility: Stephanie Edwards and Christa Miller
Selected graphics: Brian Craig
Cover design: Trevor Finney
Student reviewers: Jonathan De Pena, Nina Lindsay, Sachi Soni
Project manager / editor: Anita Walz
About the author
About the Previous Author
Fundamentals of Business, 2nd edition is adapted from a work produced and distributed under a Creative Commons license (CC BY-NC-SA 3.0) by a publisher who has requested that they and the original author not receive attribution. We wish to extend our gratitude to the original author for portions of her book which were remixed and adapted to form portions of Chapters 1-15 and 17-18 of Fundamentals of Business. If the publisher and author are both willing to allow us to provide attribution to the author while retaining use of the Creative Commons license and continuing to provide free public access, we will gladly and publicly thank the original author here.
About Stephen Skripak
Stephen J. Skripak is Professor of Practice in Management at Pamplin College of Business, Virginia Tech and former Associate Dean for Graduate Programs (2006-2014). He is a senior executive with 25 years of business leadership experience, including positions as General Manager and Chief Financial Officer with divisions of Fortune 500 companies. His background includes financial services, consumer packaged goods, apparel, and industrial companies, with emphasis in turnaround situations
Characteristics of idiopathic ventricular tachycardia originating above the pulmonary valve
No full textPanoptic studies of ventricular tachycardia (VT) originating above the pulmonary valve are scarce. The purpose of this study is to clarify the characteristic of idiopathic VT arising above pulmonary valve. We analyzed 15 consecutive patients with idiopathic VT that was successfully abolished by catheter ablation at the right ventricular outflow tract (RVOT-VT, n = 11) and above the pulmonary valve (PA-VT, n = 4). Incidence of syncope was higher in PA-VT than RVOT-VT (100 vs 27 %, P < 0.05) and polymorphic VT was also more prevalent in PA-VT (75 vs 0 %, P < 0.05). The coupling interval (315 ± 29 vs 449 ± 32 ms, mean ± SE) at the onset of VT and minimum cycle length (CL) (192 ± 13 vs 344 ± 37 ms) during VT were shorter in PA-VT (both P < 0.05). Among 12-lead ECG parameters, only R-wave amplitude in lead II was different between groups (2.05 ± 0.17 mV in PA-VT vs 1.44 ± 0.05 mV in RVOT-VT, P < 0.005). At the successful ablation site, the activation time from the onset of QRS complex did not differ between groups (-37 ± 3 vs -31 ± 4, P = 0.405), whereas, the amplitude of intracardiac electrograms was significantly lower in PA-VT (0.83 ± 0.38 mV vs 2.39 ± 0.36 mV, P < 0.05). Although the number of patients in this study is limited, VT originating above the pulmonary valve demonstrated rapid excitation and often degenerated into polymorphic VT, suggesting its malignant electrophysiological characteristics
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