University of Belgrade

About: University of Belgrade is a education organization based out in Belgrade, Serbia. It is known for research contribution in the topics: Population & Large Hadron Collider. The organization has 20667 authors who have published 47148 publications receiving 896243 citations. The organization is also known as: Univerzitet u Beogradu & Belgrade University.

Measurement of Higgs boson production in the diphoton decay channel in pp collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector

Abstract: A measurement of the production processes of the recently discovered Higgs boson is performed in the two-photon final state using 4.5 fb(-1) of proton-proton collisions data at root s = 7 TeV and 20.3 fb(-1) at root s = 8 TeV collected by the ATLAS detector at the Large Hadron Collider. The number of observed Higgs boson decays to diphotons divided by the corresponding Standard Model prediction, called the signal strength, is found to be mu = 1.17 +/- 0.27 at the value of the Higgs boson mass measured by ATLAS, m(H) = 125.4 GeV. The analysis is optimized to measure the signal strengths for individual Higgs boson production processes at this value of m(H). They are found to be mu(ggF) = 1.32 +/- 0.38, mu(VBF) = 0.8 +/- 0.7, mu(WH) = 1.0 +/- 1.6, mu(ZH) = 0.1(-0.1)(+3.7), and mu t (t) over barH = 1.6(-1.8)(+2.7), for Higgs boson production through gluon fusion, vector-boson fusion, and in association with a W or Z boson or a top-quark pair, respectively. Compared with the previously published ATLAS analysis, the results reported here also benefit from a new energy calibration procedure for photons and the subsequent reduction of the systematic uncertainty on the diphoton mass resolution. No significant deviations from the predictions of the Standard Model are found.

A novel hybrid MCDM model based on fuzzy DEMATEL, fuzzy ANP and fuzzy VIKOR for city logistics concept selection

Abstract: City logistics (CL) tends to increase efficiency and mitigate the negative effects of logistics processes and activities and at the same time to support the sustainable development of urban areas. Accordingly, various measures and initiatives are applying and various conceptual solutions are defining. The effects vary depending on the characteristics of the city. This paper proposes a framework for the selection of the CL concept which would be most appropriate for different participants, stakeholders, and which would comply with attributes of the surroundings. CL participants have different, usually conflicting goals and interests, so it is necessary to define a large number of criteria for concepts evaluation. On the other hand, the importance of the criteria is dependent on the specific situation, i.e., a large number of factors describing the surroundings. In situations like this, selecting the best alternative is a complex multi-criteria decision-making (MCDM) problem consisting of conflicting and uncertain elements. A novel hybrid MCDM model that combines fuzzy Decision Making Trial and Evaluation Laboratory Model (DEMATEL), fuzzy Analytical Network Process (ANP) and fuzzy Visekriterijumska Optimizacija i kompromisno Resenje (VIKOR) methods is developed in this paper. The model provides support to decision makers (planners, city administration, logistics service providers, users, etc.) when selecting the CL concept, which is successfully performed in this paper for the City of Belgrade.

Learning analytics to unveil learning strategies in a flipped classroom

Abstract: Prior education studies have consistently emphasized the importance of sustained and active student engagement to aid academic performance and achievement of learning outcomes (e.g., Hockings, Cooke, Yamashita, McGinty, & Bowl, 2008; Michael, 2006). The positive impact of such active learning models on academic outcomes has been well established, particularly, in the STEM (Science, Technology, Engineering andMathematics) disciplines. For example, Freeman et al. (2014) demonstrated that students undertaking STEM courses incorporating active learning models received (on average) higher academic grades and were less likely to fail in comparison to peers in more traditional and lecture based modes of teaching. While active learning has clear benefits for student learning outcomes, the process of implementation is often more complex than first anticipated (Gillies & Boyle, 2010; Hung, 2011). For instance, student engagement in active learning does not occur spontaneously and educators must employ careful consideration of the curriculum design, activity sequencing and progression as well as the diversity of learners, including learners' prior experience and motivation, background and knowledge. Flipped learning (FL) is a form of blended learning that requires students' active participation in learning activities both before and during face-to-face sessions with the teacher (Lage, Platt, & Tregua, 2000). However, students frequently lack the necessary skills, time, and/ormotivation to fully participate in pre-class activities and therefore do not commit to the level of involvement in the learning process that effectively complements the intended design (Lai & Hwang, 2016; Mason, Shuman, & Cook, 2013). Clearly, the reasoning for why students may or may not engage in pre-class activities is complex and multi-dimensional. However, if provided with a deeper insight into the types of learning strategies students employ in such active learning models, teaching staff can make better informed decisions regarding student support and course design processes (Stief & Dollar, 2009). Despite the increasing popularity of FL and similar active learning models, there has been limited attention devoted to understanding

Proposal for revision of the European Laryngological Society classification of endoscopic cordectomies

Abstract: A classification of laryngeal endoscopic cordectomies, which included eight different types, was first proposed by the European Laryngological Society in 2000. The purpose of this proposal of classification was an attempt to reach better consensus amongst clinicians and agree on uniformity in reporting the extent and depth of resection of cordectomy procedures, to allow relevant comparisons within the literature when presenting/publishing the results of surgery, and to recommend the use of guidelines to allow for reproducibility amongst practicing laryngologists. A total of 24 article citations of this classification have been found through the science citation index, as well as 3 book chapters on larynx cancer surgery, confirming its acceptance. However, on reflection, and with the passage of time, lesions originating at the anterior commissure have not been clearly described and, for that reason, a new endoscopic cordectomy (type VI) for cancers of the anterior commissure, which have extended or not to one or both of the vocal folds, without infiltration of the thyroid cartilage is now being proposed by the European Laryngological Society Committee on Nomenclature to revise and complete the initially reported classification.