Hierarchical Relational Inference

Common-sense physical reasoning in the real world requires learning about the interactions of objects and their dynamics. The notion of an abstract object, however, encompasses a wide variety of physical objects that differ greatly in terms of the complex behaviors they support. To address this, we propose a novel approach to physical reasoning that models objects as hierarchies of parts that may locally behave separately, but also act more globally as a single whole. Unlike prior approaches, our method learns in an unsupervised fashion directly from raw visual images to discover objects, parts, and their relations. It explicitly distinguishes multiple levels of abstraction and improves over a strong baseline at modeling synthetic and real-world videos.Comment: Accepted to AAAI 202

Contrastive Training of Complex-Valued Autoencoders for Object Discovery

Current state-of-the-art object-centric models use slots and attention-based routing for binding. However, this class of models has several conceptual limitations: the number of slots is hardwired; all slots have equal capacity; training has high computational cost; there are no object-level relational factors within slots. Synchrony-based models in principle can address these limitations by using complex-valued activations which store binding information in their phase components. However, working examples of such synchrony-based models have been developed only very recently, and are still limited to toy grayscale datasets and simultaneous storage of less than three objects in practice. Here we introduce architectural modifications and a novel contrastive learning method that greatly improve the state-of-the-art synchrony-based model. For the first time, we obtain a class of synchrony-based models capable of discovering objects in an unsupervised manner in multi-object color datasets and simultaneously representing more than three objectsComment: 26 pages, 14 figure

Assessment of dust emission at the limestone open pit "Milojević Brdo"

The basis of emission assessment at the Open Pit "Milojević Brdo" is to define the dust distribution depending on the wind influence and dust emitters. This paper presents the data for equipment engaged at the open pit. Through an analytical approach, the total emission of dust emitted by the mining equipment and aeolian erosion in the area of the open pit was determined. The results of this analysis represent a prediction of the state of dust impact on the environment during the exploitation process at the open pit

Error bound of certain Gaussian quadrature rules for trigonometric polynomials

In this paper we give error bound for quadrature rules of Gaussian type for trigonometric polynomials with respect to the weight function w(x) = 1+cos x, x ∈ (−π, π), for 2π -periodic integrand, analytic in a circular domain. Obtained theoretical bound is checked and illustrated on some numerical examples

Error bound of certain Gaussian quadrature rules for trigonometric polynomials

In this paper we give error bound for quadrature rules of Gaussian type for trigonometric polynomials with respect to the weight function w(x) = 1+cos x, x ∈ (−π, π), for 2π -periodic integrand, analytic in a circular domain. Obtained theoretical bound is checked and illustrated on some numerical examples

A Decrease of Unsuccessful Pairing Probability in VAMOS Mobile Cell Using Existing Connection Rearrangement

This paper analyzes the existing connection rearrangement in mobile telephony systems with implemented VAMOS techniques. The main objective of rearrangement application is to decrease connection unpairing loss when there is exactly one idle traffic subchannel (OSC) in the system. The rearrangement technique was well-known in old multistage switching systems, where it contributed to traffic loss decrease. It is proved in this paper that connection loss probability due to pairing inability is decreased when rearrangement is implemented. Connection realization is improved in following cases: when offered traffic is greater, when allowed emission base station power difference between two paired OSCs in channels is smaller and when greater channel groups are implemented. Results are verified by computer simulation and illustrated by a numerical example

Ne-etičko ponašanje u sportu

This study analyses various forms of unethical behavior, which are increasingly present in sports. The focus of the research is to identify various forms of punishment, humiliation, mistreatment and abuse in sports clubs, and to approach this issue with determination with the aim of reducing or removing the consequences. The research was conducted in a variety of sports clubs in Serbia, which were chosen at random, and the participants (n=250) responded to a specifically structured questionnaire. The research showed that, depending on the age category, various types of unethical behavior took place: undue threats and punishment (55% men, 50% women, but with a statistically significant gender difference among the lower age categories), forced to compete despite possible health risks (over 80% athletes), and sexual harassment (78% of the female respondents in the category of younger seniors). Abuse and mistreatment were present in the pioneer, cadet and junior categories, and they became more intense in the senior age. Considering that the research results clearly show the existence of certain forms of abuse and mistreatment of athletes, this points to the need for the educational work of coaches to be focused on sport.U ovom istraživanju analizirani su različiti oblici ne-etičkog ponašanja koje je sve češće u sportu. Fokus istraživanja bio je da se identifikuju različiti oblici kažnjavanja, ponižavanja, zlostavljanja i maltretiranja u sportskim klubovima, i da se ovom problemu pristupi sa ciljem da se njegove posledice ublaže ili nestanu. Istraživanje je sprovedeno u različitim sportskim klubovima u Srbiji, koji su nasumice izbrani, a učesnici (n=250) su odgovorili na posebno strukturisan upitnik. Istraživanje je pokazalo da, u zavisnosti od starosne kategorije, različiti oblici ne-etičkog ponašanja se javljaju u vidu: nepotrebne pretnje i kazne (55% muškaraca, 50% žena, ali sa statistički značajnim razlikama među polovima nižih starosnih kategorija), prisiljavanja na takmičenje uprkos opasnosti po zdravlje (preko80% sportista), i seksualnog uznemiravanja(78% ženskih učesnika u kategoriji mlađih seniora). Zlostavljanje i maltretiranje mogu se uočiti i među pionirima, kadetima i juniorskim kategorijama, i postaju ozbiljniji problemi u seniorskim kategorijama. S obzirom na to da rezultati istraživanja jasno ukazuju na to da postoji zloupotreba i maltretiranje sportista, ovo istraživanje ukazuje na potrebu da se treneri obrazuju tako da se tokom rada više fokusiraju na sportske aktivnosti

Managing water pressure for water savings in developing countries

Many water utilities, particularly in the developing countries, continue to operate inefficient water distribution systems (WDSs) with a significant amount of water and revenue losses. Various factors, manageable to different extents, contribute to water losses, such as poor infrastructure, high pressures, illegal water use, etc. Whilst the problem of water losses in WDSs is global in scale, solutions need to be tailored to local circumstances due to the various causes of water loss and the mechanisms available to manage them. This paper investigates the potentials of the available pressure management methodologies and their implementation in developing countries, using a case study of a district metering area (DMA) in Kotez-Serbia. The minimal night flow method was applied for assessment of real losses. A particular focus is on assessment of water savings due to reduction of pressures. A total of three methods for estimation of water savings are described and tested against data measured in the DMA under initial and reduced pressures: (i) the method based on Leakage Index (LI) calculations, (ii) the PRESMAC model and (iii) a newly-developed method which is based on the assumption that both leakage and consumption are pressure dependent. The results indicate that the third method leads to the most accurate prediction of the total amount of water savings under reduced pressures, with only 6% difference between measured and estimated volume of saved water