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Sreten B. Stojanovic,Dragutin Lj. Debeljkovic,Milan A. Misic 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.4
The problem of finite-time stability for a class of linear discrete-time systems with state delay is studied. The Lyapunov-Krasovskii-like functional which is based on discrete convolutions of delayed state vector andtime-dependent discrete vector functions is used. In order to obtain much less conservative results, new sufficientcondition is derived in form of linear matrix inequalities. Numerical example is given to demonstrate the effectivenessof the proposed stability criterion. It was shown that the obtained results are less conservative than someexisting ones in the literature. A computer simulation was performed for the analysis of the dynamical behaviourof this system.
Saravanakumar, Ramasamy,Stojanovic, Sreten B.,Radosavljevic, Damnjan D.,Ahn, Choon Ki,Karimi, Hamid Reza IEEE 2019 IEEE transactions on neural networks and learning Vol.30 No.1
<P>In this paper, we study the problem of finite-time stability and passivity criteria for discrete-time neural networks (DNNs) with variable delays. The main objective is how to effectively evaluate the finite-time passivity conditions for NNs. To achieve this, some new weighted summation inequalities are proposed for application to a finite-sum term appearing in the forward difference of a novel Lyapunov–Krasovskii functional, which helps to ensure that the considered delayed DNN is passive. The derived passivity criteria are presented in terms of linear matrix inequalities. A numerical example is given to illustrate the effectiveness of the proposed results.</P>
The Influence of the Braking Disc Ribs and Applied Material on the Natural Frequency
Oday I. Abdullah,Nadica Stojanovic,Ivan Grujic 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.1
One of the important problems for which must be found an optimal solution is the noise that originate from vehicles. In this research paper, it was investigated deeply the effect of ribs shape and type of material on the noise of ventilated braking discs. Four different ventilated braking discs were selected to achieve the numerical analysis, all these brakes have the same overall dimensions, except the ribs shape is different. The materials used in this work are the cast iron, AMC and CCM for all four discs. The main aim of this paper is to find the optimal ribs shape, as well as the manufacturing material for the braking disc by applying Taguchi method. The percentage share of the ribs shapes as well as of applied material influence on the noise generation, were determined by applying Analysis of Variance—ANOVA. Finally, it was found that the material influence is most significant with 74.48%, while the ribs shape influence on the noise generation is 24.24%. The most optimal results obtained for the 2nd model which was made from CCM, compared with other suggested models.
The Coexistence of Myasthenia Gravis and Myotonic Dystrophy Type 2 in a Single Patient
Ana Nikolic,Vidosava Rakocevic Stojanovic,Stanka Romac,Dusanka Savic,Ivana Basta,Dragana Lavrnic 대한신경과학회 2013 Journal of Clinical Neurology Vol.9 No.2
Background Myasthenia gravis (MG) and myotonic dystrophy type 2 (DM2) are rare disorders individually, and their coexistence in the same patient is very rare. We present a patient in which these two diseases coexisted. Case Report The patient complained of diplopia, fluctuating limb weakness, and difficulties in swallowing and speaking. A neurological examination revealed diplopia, facial, weakness of the neck and proximal limb muscles, dysphagia, dysphonia, and myotonia. The patient’s mother had DM2 and her maternal grandfather had cataracts. MG was confirmed in our patient by positive results for neostigmine and a repetitive nerve stimulation test, and elevated serum antiacetylcholine-receptor antibodies, while DM2 was confirmed by electromyography and genetic testing. The patient improved remarkably after treatment with anticholinesterases, corticosteroids, and azathioprine. Conclusions This is the second reported case of the coexistence of DM2 and MG in the same patient. Since the symptoms of these two diseases overlap it is very important to keep in mind the possibility of their coexistence, so that MG is not overlooked in patients with a family history of myotonic dystrophy.
Choi, Jonghoon,Park, Sungwook,Stojanović,, Zoran,Han, Hyung-Seop,Lee, Jongwook,Seok, Hyun Kwang,Uskoković,, Dragan,Lee, Kwan Hyi American Chemical Society 2013 Langmuir Vol.29 No.50
<P>Herein, we report a quick and simple synthesis of water-soluble gold nanoparticles using a HAuCl<SUB>4</SUB> and oleylamine mixture. Oleylamine serves as a reduction agent as well as a stabilizer for nanoparticle surfaces. The particle sizes can be adjusted by modulating reaction temperature and time. Solvothermal reduction of HAuCl<SUB>4</SUB> with oleylamine can be confirmed by measuring the product in Fourier transform infrared (FTIR) spectroscopy. The plasmon band shifting from yellow to red confirms a nanosized particle formation. Amide bonds on the surface of the nanoparticles formed hydrogen bonds with one another, resulting in a hydrophobic monolayer. Particles dispersed well in nonpolar organic solvents, such as in hexane or toluene, by brief sonication. Next, we demonstrated the transfer of gold nanoparticles into water by lipid capsulation using 1-myristoyl-2-hydroxy-<I>sn</I>-glycero-3-phosphocholine (MHPC), 1,2-distearoyl-<I>sn</I>-glycero-3-phosphoethanolamine-<I>N</I>-(methoxy polyethylene glycol)-2000 (DPPE-PEG2k), and 1,2-dioleoyl-<I>sn</I>-glycero-3-<I>N</I>-{5-amino-1-carboxypentyl}iminodiacetic acid succinyl nickel salt [DGS-NTA(Ni)]. The particle concentration can be obtained using an absorbance in ultraviolet–visible (UV–vis) spectra (at 420 nm). Instrumental analyses using transmission electron microscopy (TEM), energy-dispersive X-ray (EDX) analysis, dynamic light scattering (DLS), and FTIR confirmed successful production of gold nanoparticles and fair solubility in water. Prepared gold particles were selectively clustered via engineered ferritin nanocages that provide multiple conjugation moieties. A total of 5–6 gold nanoparticles were clustered on a single ferritin nanocage confirmed in TEM. Reported solvothermal synthesis and preparation of gold nanoclusters may serve as an efficient, alternate way of preparing water-soluble gold nanoparticles, which can be used in a wide variety of biomedical applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2013/langd5.2013.29.issue-50/la403888f/production/images/medium/la-2013-03888f_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la403888f'>ACS Electronic Supporting Info</A></P>
Agmatine protection against chlorpromazine-induced forebrain cortex injury in rats
Bratislav Dejanovic,Ivana Stevanovic,Milica Ninkovic,Ivana Stojanovic,Irena Lavrnja,Tatjana Radicevic,Milos Pavlovic 대한수의학회 2016 Journal of Veterinary Science Vol.17 No.1
This study was conducted to investigate whether agmatine (AGM) provides protection against oxidative stress induced by treatment with chlorpromazine (CPZ) in Wistar rats. In addition, the role of reactive oxygen species and efficiency of antioxidant protection in the brain homogenates of forebrain cortexes prepared 48 h after treatment were investigated. Chlorpromazine was applied intraperitoneally (i.p.) in single dose of 38.7 mg/kg body weight (BW) The second group was treated with both CPZ and AGM (75 mg/kg BW). The control group was treated with 0.9% saline solution in the same manner. All tested compounds were administered i.p. in a single dose. Rats were sacrificed by decapitation 48 h after treatment Treatment with AGM significantly attenuated the oxidative stress parameters and restored antioxidant capacity in the forebrain cortex. The data indicated that i.p. administered AGM exerted antioxidant action in CPZ-treated animals. Moreover, reactive astrocytes and microglia may contribute to secondary nerve-cell damage and participate in the balance of destructive vs. protective actions involved in the pathogenesis after poisoning.
Gordana Kocic,Ljiljana Bjelakovic,Bojko Bjelakovic,Tatjana Jevtoci-Stoimenov,Dusan Sokolovic,Tatjana Cvetkovic,Hristina Kocic,Svetlana Stojanovic,Tomaz Langerholc,Marina Jonovic 한국식품영양과학회 2014 Journal of medicinal food Vol.17 No.7
Sufficient intake of folic acid is necessary for normal embryogenesis, fetal, and neonatal development. Folic acid facilitates nucleic acid internalization, and protects cellular DNA from nuclease degradation. Human milk contains enzymes, antimicrobial proteins, and antibodies, along with macrophages, that protect against infections and allergies. However, little to no information is available on the effects of folic acid supplementation on degradation of nucleic acids in human milk. In the present study, we aimed to determine the RNase activity (free and inhibitor-bound) in colostrum and mature milk, following folic acid supplementation. The study design included a total of 59 women, 27 of whom received 400 lg of folic acid daily periconceptionally and after. Folic acid supplementation increased the free RNase and polyadenylase activity following lactation. However, the increased RNase activity was not due to de novo enzyme synthesis, as the inhibitorbound (latent) RNase activity was significantly lower and disappeared after one month. Folic acid reduced RNase activity by using double-stranded RNA as substrate. Data suggests that folic acid supplementation may improve viral RNAs degradation and mRNA degradation, but not dsRNA degradation, preserving in this way the antiviral defense.
Marija Ðošic,Sanja Erakovic,Ana Jankovic,Maja Vukašinovic-Sekulic,Ivana Z. Matic,Jovica Stojanovic,이경엽,Vesna Miškovic-Stankovic,박수진 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
Graphene (Gr) and natural polymer chitosan (CS) were introduced to hydroxyapatite (HAP) to produce athree-component composite coating, which was fabricated by cathodic electrophoretic deposition on Tisubstrates in an ethanol suspension. These HAP/CS/Gr coatings were characterized by X-ray diffraction(XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-rayphotoelectron spectroscopy (XPS) and electrochemical measurements and found that the graphene intoHAP/CS composites significantly improves their morphology, thermal stability, and bioactivity. BothHAP/CS and HAP/CS/Gr composite coatings are classified as non-cytotoxic when tested against healthyperipheral blood mononuclear cells (PBMC), while antibacterial activity against Staphylococcus aureusand Escherichia coli could not be verified.