Sorting Permutations by Limited-Size Operations

2018 ◽  
pp. 76-87 ◽  
Author(s):  
Guilherme Henrique Santos Miranda ◽  
Carla Negri Lintzmayer ◽  
Zanoni Dias
Keyword(s):  
Limited Size

Are Repeat Buyers in Cryptomarkets Loyal Customers? Repeat Business Between Dyads of Cryptomarket Vendors and Users

2017 ◽  
Vol 61 (11) ◽  
pp. 1341-1357 ◽  
Author(s):  
David Décary-Hétu ◽  
Olivier Quessy-Doré
Keyword(s):  
Technological Innovation ◽  
Limited Size ◽  
Customer Base ◽  
Internet Markets ◽  
Loyal Customer ◽  
Loyal Customers ◽  
Over Time

Organizations involved in the sale of illicit products and services have been described as small, ephemeral, and local rather than global. Given their limited size, such organizations are often unable to attract large pools of customers, but it has been noted that organizations that manage to build a small but loyal customer base are likely to be more secure and to incur fewer risks of arrest and victimization. There has been little previous research into the loyalty of repeat buyers on Internet markets but a new technological innovation, cryptomarkets, makes it now more possible to track transactions between vendors and their customers. This article looks at the level of loyalty of cryptomarket repeat buyers by tracking their purchases over time. We find that, on average, customers make 60% of their purchases from the same vendor and that providing increased amounts of information to customers increases the loyalty of cryptomarket vendors’ customer base.

Simulation and Optimization of Wedge-Shaped Ultrasonic Transducers Using Finite Element Method (FEM)

2013 ◽  
Vol 281 ◽  
pp. 112-115 ◽  
Author(s):  
Dan Jin ◽  
Zhao Hui Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Boundary Effect ◽  
Ultrasonic Transducers ◽  
Fe Model ◽  
Limited Size ◽  
Simulation And Optimization ◽  
Ultrasonic Flaw ◽  
Shape And Size ◽  
Good Agreement

Wedge-shaped transducers have been widely used in industry as probes for ultrasonic flowmeters or for ultrasonic flaw detectors. But by now, few studies have focused on the influence to the performance of the wedge-shaped transducers brought by their limited size. In this paper, the effect of the shape and size of wedge-shaped substrates on the whole transducer system is discussed and the shape and size of a transducer (0.5MHz) is optimized to eliminate the influence of the boundary effect by using a 2-D Finite Element (FE) model. Lastly, wedge-shaped transducers have been manufactured for experiment which shows a good agreement with the simulation.

Figurative language in talking about the loss of a father. The example of Americans and Poles

2021 ◽  
Vol 17 ◽  
pp. 113-127
Author(s):  
Kamila Midor
Keyword(s):  
Figurative Language ◽  
Research Project ◽  
Conceptual Metaphors ◽  
Limited Size ◽  
Loss And Grief ◽  
Language Groups ◽  
The Subject

The subject of this paper is loss and grief described by different people from two language groups: Americans and Poles. The analyzed data comes from the responses to two online questionnaires, and belongs to a larger PhD research project. In looking for examples of conceptual metaphors (Lakoff and Johnson 1980, Kövecses 2005) and conceptual blends (Fauconnier and Turner 1996, Dancygier and Sweetser 2014), we present various cases of conceptualization of loss and grief. Given the limited size of this paper, we selected examples referring to loss of a father. The aim is to compare different ways of talking about apparently the same type of loss, highlighting the fact that grief is very subjective and personal. It is also a way to present differences and a variety in viewpoint when talking about this type of loss.

Celebrating the Milk Maid: What Federal Constitutional Court President Limbach Doesn't Tell Us About the Court Says It All

2001 ◽  
Vol 2 (9) ◽  
Author(s):  
Viktor Winkler
Keyword(s):  
German Law ◽  
The Other ◽  
Constitutional Court ◽  
Limited Size ◽  
Small Stature ◽  
Basic Law ◽  
Federal Constitutional ◽  
Law Student

It's a small book. Actually, it is a very small book. Only one hundred and twenty-eight pages, it's a format so thin it could fit into a pocket. As a matter of fact, it is smaller than a copy of the Grundgesetz (German Basic Law) that a German law student would carry along to class. The book's title, however, is considerably more intrepid than the book's small stature. At the same time breathtakingly pithy and slightly immodest, the book is simply called Das Bundesverfassungsgericht (The Federal Constitutional Court). And at the top of the cover, just to make sure, the word “WISSEN” (KNOWLEDGE) appears in big letters. While one wonders how a publication of such limited size could deign to comprehensively present the important “knowledge” of the Federal Constitutional Court, the other words on the cover provide some assurance. Those words are the name of the book's author who obviously could not be more adequate for the task. The author, Jutta Limbach, is the current President of the Federal Constitutional Court presiding in her seventh year.

scholarly journals Modeling and Optimization of an Indirect Coil Gun for Launching Non-Magnetic Projectiles

Actuators ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 39 ◽  
Author(s):  
Valentin Gies ◽  
Thierry Soriano
Keyword(s):  
Initial Position ◽  
Fine Tuning ◽  
Model Coupling ◽  
Ball Speed ◽  
Limited Size ◽  
Modeling And Optimization ◽  
Electromagnetic Models

This article focuses on indirect coil guns used for launching non-magnetic objects. A mechatronic model, coupling electrical, mechanical, and electromagnetic models, is proposed. This model is applied to the optimization of a kicking system used on limited size robots for propelling real soccer balls at the RoboCup. Working with an existing coil gun, we show that fine tuning its setup, especially the initial position and the length of the non-magnetic plunger extension, leads to an increase in the ball speed of 30 % compared to previous results.

scholarly journals The Computational Complexity of Understanding Binary Classifier Decisions

2021 ◽  
Vol 70 ◽  
Author(s):  
Stephan Waeldchen ◽  
Jan Macdonald ◽  
Sascha Hauch ◽  
Gitta Kutyniok
Keyword(s):  
Polynomial Time Algorithm ◽  
Time Algorithm ◽  
Boolean Circuits ◽  
Binary Classifier ◽  
Minimal Set ◽  
Limited Size ◽  
Approximation Factor ◽  
Special Cases ◽  
Relevant Variables ◽  
Binary Classifiers

For a d-ary Boolean function Φ: {0, 1}d → {0, 1} and an assignment to its variables x = (x1, x2, . . . , xd) we consider the problem of finding those subsets of the variables that are sufficient to determine the function value with a given probability δ. This is motivated by the task of interpreting predictions of binary classifiers described as Boolean circuits, which can be seen as special cases of neural networks. We show that the problem of deciding whether such subsets of relevant variables of limited size k ≤ d exist is complete for the complexity class NPPP and thus, generally, unfeasible to solve. We then introduce a variant, in which it suffices to check whether a subset determines the function value with probability at least δ or at most δ − γ for 0 < γ < δ. This promise of a probability gap reduces the complexity to the class NPBPP. Finally, we show that finding the minimal set of relevant variables cannot be reasonably approximated, i.e. with an approximation factor d1−α for α > 0, by a polynomial time algorithm unless P = NP. This holds even with the promise of a probability gap.

Optimal sub-graph selection over coded networks with delay and limited-size buffering

2011 ◽  
Vol 5 (11) ◽  
pp. 1497-1505 ◽  
Author(s):  
H. Ghasvari ◽  
B.H. Khalaj ◽  
M.A. Raayatpanah ◽  
H. Bakhshi
Keyword(s):  
Limited Size

Safe Navigation Algorithm for Autonomous Underwater Vehicles

2021 ◽  
Vol 29 (1) ◽  
pp. 97-110
Author(s):  
V.S. Bykova ◽  
◽  
A.I. Mashoshin ◽  
I.V. Pashkevich ◽  
◽  
...  
Keyword(s):  
Control System ◽  
Autonomous Underwater Vehicle ◽  
Autonomous Underwater Vehicles ◽  
Underwater Vehicle ◽  
Underwater Vehicles ◽  
Limited Size ◽  
Safe Navigation ◽  
Navigation Algorithm ◽  
Navigation Algorithms ◽  
Ice Edge

Two safe navigation algorithms for autonomous underwater vehicles are described: algorithm for avoidance of point obstacles including all the moving underwater and surface objects, and limited size bottom objects, and algorithm for bypassing extended obstacles such as bottom elevations, rough lower ice edge, garbage patches. These algorithms are developed for a control system of a heavyweight autonomous underwater vehicle.

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