72 research outputs found
Tips and tricks for building a good paper: what editors want
No full textESSKA is constantly committed to promoting the improvement of scientific quality through the publication of books and the organization of dedicated conferences. In line with this commitment, this interview paper was crated with the aim of being useful for all the young scientists and orthopaedics keen in musculoskeletal and sport medicine research. Three Editors from the most important journals in our field were invited to participate: Jon Karlsson from Knee Surgery Sport Traumatology and Arthroscopy, Bruce Reider from The American Journal of Sport Medicine and Edward Wojtys from Sports Health. © 2020, The Author(s)
A distributed power control and mode selection algorithm for D2D communications
No full textDevice-to-device (D2D) communications underlaying a cellular infrastructure has recently been proposed as a means of increasing the resource utilization, improving the user throughput and extending the battery lifetime of user equipments. In this article we propose a new distributed power control algorithm that iteratively determines the signal-to-noise-and-interference-ratio (SINR) targets in a mixed cellular and D2D environment and allocates transmit powers such that the overall power consumption is minimized subject to a sum-rate constraint. The performance of the distributed power control algorithm is benchmarked with respect to the optimal SINR target setting that we obtain using the Augmented Lagrangian Penalty Function method. The proposed scheme shows consistently near optimum performance both in a single-input-multiple-output and a multiple-input-multiple-output setting. We also propose a joint power control and mode selection algorithm that requires single cell information only and clearly outperforms the classical cellular mode operation.</p
On opportunistic power control for MIMO-OFDM systems
No full textTransmit antenna diversity and single user spatial multiplexing have become attractive in practical systems, because they achieve performance gains without requiring sophisticated channel state information (CSI) feedback mechanisms. On the other hand, when fast and accurate CSI at the transmitter is available, opportunistic power control (OPC) is an attractive alternative to signal-to-interference-and-noise ratio (SINR) target following approaches, because it maximizes throughput by taking advantage of fast channel variations. In this paper we examine the question whether OPC is worth the pain of obtaining fast CSI by evaluating the gains of OPC for the downlink of a system employing multiple input multiple output (MIMO) systems with Alamouti and open loop spatial multiplexing (SM). We formulate the OPC problem as a throughput maximization task subject to power budget and fairness constraints. We solve this task by the Augmented Lagrangian Penalty Function and find that without fairness constraints, OPC in concert with SM provides superior throughput. With increasingly tight fairness constraints, Alamouti along with equal power allocation becomes a viable alternative to the SM OPC scheme. Both from fairness and throughput perspectives, Alamouti along with OPC is particularly efficient when adaptive MCS is employed and users with large differences in channel qualities have to share the total transmit power.</p
The Beginning of Work of the Higher Primary School in Virovitica with Special Reference to the Construction of the New School Building
No full textNakon što je prikazan razvoj viših pučkih škola u Hrvatskoj, autor na osnovi uvida u građu iznosi nove spoznaje o početku rada Više pučke škole u Virovitici. Isto tako prikazana je naučna osnova prema kojoj je Viša pučka škola u Virovitici započela svoj rad, nastavnici koji su radili prve školske godine kao i učenici koji su uspješno završili prvu školsku godinu. Prikazana je također izgradnja nove školske zgrade za Višu pučku školu u Virovitici.After the development of higher primary schools in Croatia was shown, the author sets forth a new learning about the beginning of Higher Primary School in Virovitica on the basis of the insight into the materials. There are also shown the apprenticeship essentials according to which the Higher Elementary School in Virovitica began its work, the teachers who worked there during the first school year, as well as the students who successfully finished the first year. The construction of the new school building for Higher Primary School in Virovitica is also shown
A Distributed Power Control Scheme for Cellular Network Assisted D2D Communications
No full textDevice-to-device (D2D) communications underlaying a cellular infrastructure has recently been proposed as a means of increasing the resource utilization, improving the user throughput and extending the battery lifetime of user equipments. In this paper we propose a new distributed power control algorithm that iteratively determines the signal- to-noise-and- interference-ratio (SINR) targets in a mixed cellular and D2D environment and allocates transmit powers such that the overall power consumption is minimized subject to a sum-rate constraint. The performance of the distributed power control algorithm is benchmarked with respect to the optimal SINR target setting that we obtain using the Augmented Lagrangian Penalty Function (ALPF) method. The proposed scheme shows consistently near optimum performance both in a single-input-multiple-output (SIMO) and a multiple-input-multiple-output (MIMO) setting.</p
The development of apprentice (vocational) education in Croatia
No full textU članku je dan povijesni pregled razvoja obrtničkog školstva u Hrvatskoj – od naukovanja do osnutka šegrtskih (obrtničkih) škola. Tijekom 19. i 20. stoljeća, do današnjih dana, autor analizira sadržaj i promjene nastavnih planova, organizaciju rada škole, nazive škola, upravu škola, učenike (šegrte, naučnike), učitelje (nastavnike), financiranje škole i naukovanja kod obrtnika.At the beginning of the article the apprenticeship till the founding of the apprentice (vocational) schools in Croatia is described, as well as the founding of the apprentice (vocational) schools. Later on, the author follows the development of vocational education through the historical development, from the Austrian-Hungarian Monarchy until the establishing of the Republic of Croatia, by describing the conditions and changes connected to the curriculum and the organization of school activities, the name of the school, students (apprentices, trainees), teachers, the financing of the school and the apprenticeship with the tradesmen
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