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1.
Remote controlled laboratory as a modern form of engineering education
Uroš Župerl, Mateja Ploj Virtič, 2013, izvirni znanstveni članek

Opis: Technological development enables many benefits and improvements with regard to the educational process. This paper discusses the development of remote laboratory architecture for web-based programming and control of a passenger lift located at the Faculty of Mechanical Engineering, University of Maribor (UM FME). A dedicated web page provides users with the opportunity to learn how to programme and control a programmable logic controller (PLC) from remote sites. Remote-controlled experiments involving additional visual support have similar learning effects compared to practical work in a laboratory, the difference being that students acquire additional technological knowledge in the latter. This paper presents, among other things, the details regarding the development of the respective laboratory for remote control of lift operation. In conclusion, the article critically examines the advantages and disadvantages of the here presented remote-controlled laboratory.
Ključne besede: remote controlled laboratory, passenger lift, laboratory experimentation, mechanical engineering, undergraduate study
Objavljeno: 21.12.2015; Ogledov: 671; Prenosov: 63
.pdf Celotno besedilo (706,93 KB)
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2.
Copositive and semidefinite relaxations of the quadratic assignment problem
Janez Povh, Franz Rendl, 2009, izvirni znanstveni članek

Opis: Semidefinite relaxations of the quadratic assignment problem (QAP) have recently turned out to provide good approximations to the optimal value of QAP. We take a systematic look at various conic relaxations of QAP. We first show that QAP can equivalently be formulated as a linear program over the cone of completely positive matrices. Since it is hard to optimize over this cone, we also look at tractable approximations and compare with several relaxations from the literature. We show that several of the well-studied models are in fact equivalent. It is still a challenging task to solve the strongest of these models to reasonable accuracy on instances of moderate size.
Ključne besede: matematično programiranje, problem kvadratičnega prirejanja, kopozitivno programiranje, semidefinitna poenostavitev, quadratic assignment problem, copositive programming, semidefinite relaxations, lift-and-project relaxations
Objavljeno: 10.07.2015; Ogledov: 780; Prenosov: 80
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