Binoy Krishna Roy

Bio: Binoy Krishna Roy is an academic researcher from National Institute of Technology, Silchar. The author has contributed to research in topics: Chaotic & Attractor. The author has an hindex of 23, co-authored 201 publications receiving 2068 citations. Previous affiliations of Binoy Krishna Roy include Kalyani Government Engineering College & Ton Duc Thang University.

Synchronization and anti-synchronization of Lu and Bhalekar–Gejji chaotic systems using nonlinear active control

Abstract: This paper aims at synchronization and anti-synchronization between Lu chaotic system, a member of unified chaotic system, and recently developed Bhalekar–Gejji chaotic system, a system which cannot be derived from the member of unified chaotic system. These synchronization and anti-synchronization have been achieved by using nonlinear active control since the parameters of both the systems are known. Lyapunov stability theory is used and required condition is derived to ensure the stability of error dynamics. Controller is designed by using the sum of relevant variables in chaotic systems. Simulation results suggest that proposed scheme is working satisfactorily.

The simplest 4-D chaotic system with line of equilibria, chaotic 2-torus and 3-torus behaviour

Abstract: The paper reports the simplest 4-D dissipative autonomous chaotic system with line of equilibria and many unique properties. The dynamics of the new system contains a total of eight terms with one nonlinear term. It has one bifurcation parameter. Therefore, the proposed chaotic system is the simplest compared with the other similar 4-D systems. The Jacobian matrix of the new system has rank less than four. However, the proposed system exhibits four distinct Lyapunov exponents with $$(+, 0, -, -)$$ sign for some values of parameter and thus confirms the presence of chaos. Further, the system shows chaotic 2-torus $$(+,0,0,-)$$ , quasi-periodic $$[(0,0,-,-), (0,0,0,-)]$$ and multistability behaviour. Bifurcation diagram, Lyapunov spectrum, phase portrait, instantaneous phase plot, Poincare map, frequency spectrum, recurrence analysis, 0–1 test, sensitivity to initial conditions and circuit simulation are used to analyse and describe the complex and rich dynamic behaviour of the proposed system. The hardware circuit realisation of the new system validates the MATLAB simulation results. The new system is developed from the well-known Rossler type-IV 3-D chaotic system.

Computer vision : a modern approach = 计算机视觉 : 一种现代的方法

Abstract: From the Publisher: The accessible presentation of this book gives both a general view of the entire computer vision enterprise and also offers sufficient detail to be able to build useful applications. Users learn techniques that have proven to be useful by first-hand experience and a wide range of mathematical methods. A CD-ROM with every copy of the text contains source code for programming practice, color images, and illustrative movies. Comprehensive and up-to-date, this book includes essential topics that either reflect practical significance or are of theoretical importance. Topics are discussed in substantial and increasing depth. Application surveys describe numerous important application areas such as image based rendering and digital libraries. Many important algorithms broken down and illustrated in pseudo code. Appropriate for use by engineers as a comprehensive reference to the computer vision enterprise.

Rfid Handbook Fundamentals And Applications In Contactless Smart Cards And Identification

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Adaptive network based fuzzy inference system (ANFIS) training approaches: a comprehensive survey

Abstract: In the structure of ANFIS, there are two different parameter groups: premise and consequence. Training ANFIS means determination of these parameters using an optimization algorithm. In the first ANFIS model developed by Jang, a hybrid learning approach was proposed for training. In this approach, while premise parameters are determined by using gradient descent (GD), consequence parameters are found out with least squares estimation (LSE) method. Since ANFIS has been developed, it is used in modelling and identification of numerous systems and successful results have been achieved. The selection of optimization method utilized in training is very important to get effective results with ANFIS. It is seen that derivate based (GD, LSE etc.) and non-derivative based (heuristic algorithms such us GA, PSO, ABC etc.) algorithms are used in ANFIS training. Nevertheless, it has been observed that there is a trend toward heuristic based ANFIS training algorithms for better performance recently. At the same time, it seems to be proposed in derivative and heuristic based hybrid algorithms. Within the scope of this study, the heuristic and hybrid approaches utilized in ANFIS training are examined in order to guide researchers in their study. In addition, the final status in ANFIS training is evaluated and it is aimed to shed light on further studies related to ANFIS training.

Equilibrium ring-closing metathesis.

Abstract: Ring-closing metathesis (RCM) of dienes is one of the most important methodologies now in use for the assembly of cyclic organic compounds. First employed by Villemin and by Tsuji nearly three decades ago,1,2 the reaction has risen to astonishing prominence in organic synthesis over the past decade, owing largely to the development of easily handled catalysts that enable controlled reaction.3 RCM represents a key step in many synthetic sequences: recent reviews describe its use in, inter alia, construction of synthetically valuable building blocks such as heterocyclic rings containing phosphorus,4 sulfur,4 oxygen,5 or nitrogen,5,6 including aromatic heterocycles;7 spirocyclic,8,9 cyclophane,8 and polycyclic compounds;8,9 and compounds of biological and medicinal relevance such as peptidomimetics,10,11 carbohydrate derivatives,11-14 alkaloids,11,15-19 bioactive cyclic molecules,20,21 and polycyclic ethers,22 including macrocyclic aza-crown ethers23 and topologically interesting molecules and “molecular machines”.24,25 While the common rings of 5-7 members have historically been dominant, owing in part to their greater ease of access, important advances have been made in the synthesis of medium20,26-30 and macrocyclic16,17,23,27,31-35 targets. One aspect of this review will examine the increased tendency of many medium and large rings to participate in equilibrium metathesis, and the resulting implications for selectivity and yields.

Grubbs' ruthenium-carbenes beyond the metathesis reaction: less conventional non-metathetic utility.

Abstract: ed via -hydride elimination, collapsing into the 1,3diene derivative 419. Alternatively, the formation of this product might be interpreted as a result of the direct thermal ene-type reaction of allenenes 418. To understand the latter process, compound 418b was refluxed in CH2Cl2 without the catalyst Ru-2 for a prolonged time, but no reaction took place. In addition, when heated at higher temperature (refluxing in toluene or xylene), the thermal [2 + 2]-cycloaddition between the terminal olefin and the distal double bond of the allenyl moiety furnished the corresponding cyclobutane derivative. When trienyne 421 was subjected to ring-closing metathesis reaction conditions using the second-generation Grubbs’ catalyst Ru-2, an unusual nonmetathetic activity was observed, with the cycloisomerization product being obtained as the major product. The main fraction of the reaction of trienyne 421 was found to be a mixture of the metathesis product 422 and the cycloisomerization adduct 423 (1:2 ratio) in 45% combined yield. Besides 422 and 423, a minor product 424 was isolated (11%) along with starting material 421 (6.5%). When the Hoveyda-Grubbs’ catalyst Ru-3 was used, further cycloisomerization occurred and all that was isolated was a mixture of 422 and 423 in a 1:4 ratio (45% yield) and 421 (6.5%) (Scheme 132).109 This result suggested that the alkyne was more reactive toward the ruthenium-carbene complex than the terminal alkene for trienyne 421. Therefore, initial coordination preferentially occurred at the alkyne to give the metallacyclopentene 425 (path a). Scheme 138. Vinylcyclopropane Epimerization Catalyzed by Carbene Ru-1 Scheme 139. Tandem RCM-Dehydration Catalyzed by Ru-1a 3854 Chemical Reviews, 2009, Vol. 109, No. 8 Alcaide et al.