A new linear consistency test attack on noised irregularly clocked linear feedback shift registers

Linear Consistency Test (LCT) is a widely used algebraic attack against pseudorandom generator schemes. A system of linear equations depending on a guessed part of the key is assigned to the analyzed generator and checked for consistency. If the guessed part of the key is not the right one, the system will be inconsistent with high probability. In the presence of noise, additional measures are necessary for this attack to be successful. They must reduce the influence of intercepted output bits complemented by noise. In this paper, a technique is described that tries to guess which bit(s) of the intercepted output sequence are complemented by noise and remove all the equations from the linear system assigned to the generator that depend on those bits. The technique is demonstrated on cryptanalysis of a Binary Rate Multiplier (BRM). The experiments on this generator show that such an attack is feasible if the noise level is up to moderate

The cycles of revolution: how Wegener and Milanković changed the earth sciences

The year 1912 is annus mirabilis for Earth sciences. In two crucial papers Alfred Wegener and Milutin Milanković independently set up revolutionary theories based on far-reaching visions of continental drift and climate orbital forcing. Their contributions simultaneously did for the Earth sciences what the theory of evolution did for biology and what the theory of relativity did for physics. They provided Earth sciences with a comprehensive perspective of Earth’s dynamics in both astronomical and terrestrial terms, and revolutionized geology by abandoning the ideas of a climatologically self-sufficient Earth and unmovable continents – remnants of the old geocentric picture of the unmoving, centered Earth. In the secular sense they finally completed the heliocentric theory that was set up by Copernicus. This paper follows the strange synchronicity in their life and work cycles

System theoretic approach to sustainable development problems

This paper shows that the concepts and methodology contained in the system theory and operations research are suitable for application in the planning and control of the sustainable development. The sustainable development problems can be represented using the state space concepts, such as the transition of system, from the given initial state to the final state. It is shown that sustainable development represents a specific control problem. The peculiarity of the sustainable development is that the target is to keep the system in the prescribed feasible region of the state space. The analysis of planning and control problems of sustainable development has also shown that methods developed in the operations research area, such as multicriteria optimization, dynamic processes simulation, non-conventional treatment of uncertainty etc. are adequate, exact base, suitable for resolution of these problems

Chemometric characterization of the hydrogen bonding complexes of secondary amides and aromatic hydrocarbons

The paper reports the results of the study of hydrogen bonding complexes between secondary amides and various aromatic hydrocarbons. The possibility of using chemometric methods was investigated in order to characterize N-H•••π hydrogen bonded complexes. Hierarchical clustering and Principal Component Analysis (PCA) have been applied on infrared spectroscopic and Taft parameters of 43 N-substituted amide complexes with different aromatic hydrocarbons. Results obtained in this report are in good agreement with conclusions of other spectroscopic and thermodynamic analysis

Determination of effects of antioxidants addition in food on bull's sperm quality parameters in heat stress condition

Oksidativni stres rezultat je neravnoteņe izmeĎu proizvodnje reaktivnih kiseoničnih vrsta (ROS) i zańtitnog efekta antioksidativnog mehanizma odgovornog za njihovu neutralizaciju i uklanjanje. Prekomerno stvaranje ROS u organizmu negativno utiče na pokretljivost spermatozoida i oplodnu sposobnost. Sem toga, mnogobrojni uticaji okoline, fiziolońki i genetski faktori mogu uticati na lońu funkciju spermatozoida i neplodnost. Značajnu ulogu u zańtiti spermatozoida od oksidativnog stresa imaju antioksidanti superoksid dismutaza (SOD) i glutation peroksidaza (GPx) te se stoga smatraju korisnim indikatorima antioksidativnog statusa. Cilj ove doktorske disertacije je bio ispitivanje efekata dodavanja prirodnih antioksidanasa u hrani za priplodne bikove (inaktivisanih ņivih ćelija kvasca Saccharomycess cerevisae [soj R397] sa visokim nivoom organski vezanog selena (izvor selen zavisne glutation-peroksidaze-Se-GPx) i liofilizovanog preparata pulpe dinje Cucumis melo (izvor superoksid dismutaze-SOD) na kvalitet ejakulata priplodnih bikova u uslovima toplotnog stresa. U ogled je bilo uključeno 15 bikova podeljenih u tri grupe (kontrolna grupa – C, ogledna grupa -M kojoj je dodavan izvor SOD – i ogledna grupa – A tretirana izvorom Se-GPx). Ispitivani su biohemijski parametri u krvnom serumu, parametri antioksidativne zańtite (SOD i Se-GPx) u seminalnoj plazmi kao i kvalitet semena u svim grupama. TakoĎe, ispitivana je povezanost izmeĎu sredinskih faktora (temperatura i vlaņnost), aktivnosti antioksidativnih enzima i kvaliteta sperme. Kod tretiranih bikova uočeno je povećanje aktivnosti SOD i GPx u odnosu na kontrolnu grupu, ńto ukazuje da su oba dodatka hrani povećala antioksidativni kapacitet semene plazme. Sem toga, antioksidansi u hrani su imali pozitivan uticaj na ukupnu pokretljivost spermatozoida jer je zabeleņeno značajno povećanje ukupne pokretljvosti kod tretiranih grupa. Analizom korelacije izmeĎu aktivnosti svakog enzima i procenta ukupno pokretnih i progresivno pokrenih spermatozoida kod svakog bika ponaosob nije ustanovljena značajna povezanost. Ispitivanjem uticaja THI (temperature-humidity index) na aktivnost antioksidativnih enzima uočeno je da je sa porastom THI dońlo do povećanja aktivnosti SOD i GPx, ali ne statistički značajnog. Pokazano je da ambijentalna temperatura i vlaņnost nisu značajno uticali na kvalitet semena u svim oglednim grupama. Moņe se zaključiti da je kod sve tri grupe bikova dońlo do povećanja aktivnosti oba enzima u semenoj plazmi, ali je povećanje značajno niņe u kontrolnoj grupi nego u tretiranim grupama. Ovo nam govori da je antioksidativni kapacitet semene plazme netretiranih bikova bio niņi nego kod tretiranih grupa bikova. Citomorfolońke analize semena su sprovoĎene u cilju utvrĎivanja odnosa ņivih/mrtvih ćelija, nalaza intaktnih i ońtećenih akrozoma, protoplazmatskih kapljica, kao i primarnih, sekundarnih i ukupno patolońkih formi spermatozoida specifičnim supravitalnim bojenjem po Blomu. Nije utvrĎeno postojanje značajna razlika izmeĎu ispitivanih grupa bikova prema prosečnom učeńću ņivih i mrtvih spermatozoida.Oxidative stress is a result of disbalance between reactive oxygen species (ROS) production and protection effect of antioxidative mechanism responsible for their neutralization and removal. Overproduction of ROS in body has negative influence on sperm motility and fertility. Besides, numerous effects of environment, physiological and genetic factors could impair function of sperm and cause infertility. Superoxide dismutase (SOD) and glutathione peroxidase (GPx) have key role in protection of oxidative stress and they are useful indicators of antioxidative stress. The aim of the current research was to assess the effects of the feed additive made of lyophilized melon juice (source of superoxide dismutase, SOD) and inactivated live Saccharomyces cerevisiae (strain R397) cells added to feed via the product containing high levels of organically bound selenium (source of selenium-dependent glutathione peroxidase, Se-GPx) on the semen quality of bulls in heat stress conditions. The 15 bulls chosen for the experiment were assigned to three equal groups (control –group C; treated group E-I, given the source of SOD; and treated group E-II, treated with the source of Se-GPx).The biochemical parameters in blood serum and the parameters of antoxidative protection (SOD and Se-GPx) in seminal plasma were determined spectrophotometrically. Whilst semen quality parameters were determined by CASA (computer assysted sperm analysis) and by cytopatomorphological analyzes. Relationship between environmental factors (temperature and humidity), activity of antioxidative enzymes and semen quality were determined also. The average SOD and GPx activity in the treated bulls was significantly higher than in control group and showed that both feed additives increased the antioxidative capacity of the seminal fluid. Besides, the antioxidative additives had positive influence on sperm motility because higher sperm motility was determined in treated groups. The analysis of relations between the activity of each enzyme and sperm motility and progressive motility in each of the bulls failed to detect significant correlation. The analysis of the relation between THI (temperature-humidity index) and the activity of the antioxidative enzymes revealed that the increase in THI coincided with the increase in the SOD and GPx activity but not significantly. Results showed that environmental temperature and humidity had no significant influence on semen quality in treated groups. It can be concluded that in all of the three groups of the bulls there was an increase in the activity of both enzymes in the seminal plasma, but the increase was significantly higher in the treated groups than in control group. Thus, the antioxidative capacity of the seminal plasma of treated bulls was proven to be higher (M and A groups). Cytomorphology analyzes of semen showed that there is no significant differences between groups according to the average of live and dead cells ratio

Mogućnosti proizvodnje alkoholnih pića na bazi grožđa od nekih novostvorenih sorti vinove loze

The paper is concerned with investigations on the possibility of producing grape-based alcoholic drinks from newly created grapevine varieties, such as Riesling Italian, Seedling 14660, Muscat Hamburg and Godominka. All chemical parameters for produced grape brandies, marc brandies and wine distillates complied with standards of quality as prescribed by the Regulations for quality of alcoholic drinks. Organoleptic evaluation proved that Seedling 14660 produced best scored wine distillate (17.85), Muscat Hamburg and Godominka gave best scored grape brandy (18.25) and Godominka yielded best scored marc brandy (18.40). Sensory properties of assessed brandies and wine distillate indicate that aroma and quality are gaining in intensity and level of improvement, starting from wine distillate to marc brandies. Also, intensive fruity-floral aroma reminding of lily-of-the-valley and iris fragrance is evident.U radu su obavljena istraživanja vezana za mogućnost proizvodnje alkoholnih pića na bazi grožđa od nekih novostvorenih sorti vinove loze, i to: Rizling italijanski, Sejanac 1466, Muskat hamburg i Godominka. Kvantitativna hemijska analiza dobijenih lozovača, komovica i vinskih destilata pokazala je uklapanje svih parametara u norme kvaliteta, koje su predviđene i propisane Pravilnikom o kvalitetu i drugim zahtevima za alkoholnih pića, Sl.list SCG br.4/2003. Najbolje ocenjeni vinski destilat dao je sejanac 1466 (17,85), najbolju lozovaču sorte Muskat hamburg i Godominka (18,25), a najbolju komovicu sorta Godominka (18,40). Senzorne karakteristike ocenjenih rakija i vinskog destilata ukazuju na pojavu intenziviranja i oplemenjivanja mirisa i kvaliteta u smeru od vinskog destilata ka komovicama, kao i pojavu prisustva jednog intenzivnog voćno-cvetnog karaktera mirisa, koji je dosta podsećao na miris đurđevka i irisa

IMPLEMENTATION OF THE EU (SCHENGEN) ACQUES IN THE WESTERN BALKANS AND ABOLISHING THE BORDER CONTROLS BETWEEN THE REPUBLIC OF SERBIA AND THE REPUBLIC OF NORTH MACEDONIA

The European perspective of the Western Balkans, i.e. the joining of the countries of the region to the European Union, was promoted at the Summit of the European Council in Thessaloniki exactly 20 years ago. From then until today, the European perspective for this region is often emphasized by the EU institutions and the leaders of the member states of the Union, so that the end of the negotiations and the full membership in the EU actually seem more and more distant every day. Citizens of most countries from the Western Balkans perceive EU membership as a distant, uncertain future, which increasingly generates dissatisfaction, growth of Euroscepticism and doubts about the sincere intentions of all participants in the European integration processes. This slow, long frozen and often blocked accession process has been followed by various initiatives, by the EU and the countries of the Western Balkans as intermediate stages, until the Union implements its own reform and starts the enlargement process again in full capacity. The initiatives relate to improving economic cooperation, establishing a common market and achieving greater economic growth in the region, and as such the most prominent are the Berlin Process and the Open Balkans. One of the basic postulates embedded in the two initiatives, which are perceived as rivals, is the freedom of movement, that is, the enjoyment of the four basic freedoms on which the EU itself is built. The functioning of the EU single market required the abolition of all barriers and border controls themselves in support of the freedom of movement of goods, goods, capital and services which was supported by a special integration process known as Schengen integration. Freedom of movement is the focus of the authors of this paper, who through analysis and research of a part of the EU acquis will point out the possibility of its direct applicability as a basis for abolishing the internal borders of the Western Balkans, i.e. for a start between two countries Republic of North Macedonia and Republic of Serbia. These are countries in different stages of accession negotiations with the EU, but still with sufficiently harmonized national legislation with the Schengen acquis, without mutual disputes, with a relatively high degree of mutual trust that can quickly and efficiently significantly support the functioning of the common market by abolishing border controls so that later in the process all the countries of the Western Balkans are gradually included.   &nbsp

Two-dimensional numerical analysis of active flow control by steady blowing along foil suction side by different urans turbulence models

The effects of active separation control by steady blowing jets were investigated numerically on three different examples: subsonic flow past Aerospatiale A airfoil at 13 degrees angle-of-attack, transonic flow past NACA 0012 airfoil at 4 degrees angle-of attack, and transonic flow in linear compressor/turbine cascade. Performed analyses are two-dimensional, flow is turbulent (or transitional) while fluid is viscous and compressible. Jets are positioned along the suction sides of the foils, the first one being located just upstream of the separation point, and modeled by source terms added to flow equations. Several different jet diameters and intensities are investigated. As the choice of turbulence model affects the final solution of Reynolds equations, turbulence is modeled by four different models: Spalart-Allmaras, realizable k-epsilon, k-omega SST, and gamma-Re-theta, and a comparison of obtained results is performed. Goals of the study include definition of an adequate numerical setting that enables sufficiently correct simulation of the problems in question as well as evaluation of the possible increase in aerodynamic performances. Lift coefficients, lift-to-drag ratios or relative pressure differences are improved for all controlled cases