Search for: coordination
0.008 seconds
Total 333 records

    A simple method for derivation of the rovibrational hamiltonian: Application to orthogonal radau coordinate systems as special cases

    , Article Journal of the Iranian Chemical Society ; Volume 7, Issue 1 , 2010 , Pages 77-83 ; 1735207X (ISSN) Ebrahimi, H. P ; Tafazzoli, M ; Islampour, R ; Sharif University of Technology
    The molecular Hamiltonian of polyatomic molecules has been obtained. A general choice of internal coordinates depending on external parameters was considered. The rovibrational Hamiltonian for this set of coordinate system was derived in general terms as a function of the external parameters a and b. This procedure is also applicable to various kinds of internal coordinates in a straightforward way. The rovibrational Hamiltonian of triatomic molecules is considered as an application of this general formulation. In addition, orthogonal Radau coordinates are considered as cases of this new approach  

    Achievablity and Secrecy Analysis of Rates in Communication Systems for Having Coordinated Behaviour

    , M.Sc. Thesis Sharif University of Technology Haddadpour, Farzin (Author) ; Aref, Mohammad Reza (Supervisor) ; Aminzadeh Gohari, Amin (Co-Advisor)
    Elements of a theory of cooperation and coordination in networks will be developed. Rather than considering a communication network as a means of distributing information, or of reconstructing random processes at remote nodes, we ask what dependence can be established among the nodes given the communication constraints. Specifically, in a network with communication rates {R(i,j)} between the nodes, we ask what the set of all is achievable joint distributions p(x1,…,xm) of actions at the nodes of the network. After describing the concepts of empirical coordination for some special networks, we will consider secrecy concepts in coordination. Then we will discuss the concepts of strong... 

    Diastereoselective synthesis and catalytic activity of two chiral cis-dioxidomolybdenum(VI) complexes

    , Article European Journal of Inorganic Chemistry ; Volume 2018, Issue 22 , 15 June , 2018 , Pages 2549-2556 ; 14341948 (ISSN) Haghdoost, M. M ; Zwettler, N ; Golbaghi, G ; Belaj, F ; Bagherzadeh, M ; Schachner, J. A ; Mosch Zanetti, N. C ; Sharif University of Technology
    Wiley-VCH Verlag  2018
    Two enantiomerically pure chiral dioxidomolybdenum(VI) complexes (1 and 2) of the type [MoO2L] (L = dianionic, tetradentate ONNO-ligand) were synthesized and investigated in enantioselective oxidation reactions. The solid-state structures of complex 1 and 2, determined via single-crystal X-ray diffraction analysis revealed two fundamentally different coordination geometries: a C1-symmetric cis-β isomer (Λ-1), and a C2-symmetric cis-α isomer (Δ-2). In both cases, only one of the two possible helical enantiomers (Λ- or Δ-helix) was formed. The complexes were examined as precatalysts in the epoxidation of the challenging prochiral substrate trans-stilbene, using either tert-butyl hydroperoxide... 

    Designing a dynamic buyer-supplier coordination model in electronic markets using stochastic petri nets

    , Article International Journal of Information Systems and Supply Chain Management ; Volume 1, Issue 3 , 2008 , Pages 1-20 ; 19355726 (ISSN) Mahdavi, I ; Mohebbi, S ; Cho, N ; Paydar, M. M ; Mahdavi Amiri, N ; Sharif University of Technology
    Functional relationship between supplier and buyer in an open market place leads to investigate the role of both quantifiable and non-quantifiable parameters in coordination mechanism with the aim of achieving higher performance in supply chain activities. Here, we develop a supply chain model and a new agent to analyze and simulate the players' behavior in the network. A cooperative game theory framework is utilized between buyer and supplier in order to increase the supply chain performance. The study is supported by presenting SC Net Optimizer as a tool for implementing the proposed coordination mechanism and evaluates the performance of the chain by simulation using stochastic Petri nets... 

    Introducing an Audit Method for Measuring the Integrity of an Organization

    , M.Sc. Thesis Sharif University of Technology Mofatteh, Mohammad Hossein (Author) ; Akbari Jokar, Mohammad Reza (Supervisor)
    Managing the supply chain is a competitive necessity in today's global marketplace where differentiation between products and services means providing a total value package that can compete for an increasingly discerning and empowered customer. Today's view is one of integration. Supply chain management is the integrated management of business links, of information flows and of people. This research is based on a study conducted to introduce a reference model for Supply Chain integration. In that study, 10 drivers are introduced as keys for integrity in Supply Chain. The objective of this article is to discuss a method which has been developed to measure objectively and quantify the level of... 

    Implementation of a high-order compact finite-difference lattice Boltzmann method in generalized curvilinear coordinates

    , Article Journal of Computational Physics ; Vol. 267 , 2014 , Pages 28-49 ; ISSN: 00219991 Hejranfar, K ; Ezzatneshan, E ; Sharif University of Technology
    In this work, the implementation of a high-order compact finite-difference lattice Boltzmann method (CFDLBM) is performed in the generalized curvilinear coordinates to improve the computational efficiency of the solution algorithm to handle curved geometries with non-uniform grids. The incompressible form of the discrete Boltzmann equation with the Bhatnagar-Gross-Krook (BGK) approximation with the pressure as the independent dynamic variable is transformed into the generalized curvilinear coordinates. Herein, the spatial derivatives in the resulting lattice Boltzmann (LB) equation in the computational plane are discretized by using the fourth-order compact finite-difference scheme and the... 

    Synthesis, characterization, and application of a new tripodal ligand for the preparation of LSCF(6482) perovskite

    , Article Chemical Papers ; Vol. 68, issue. 7 , 2014 , p. 989-994 Taheri, Z ; Ghanbari, B ; Hajibabaei, H ; Sharif University of Technology
    The main aim of this paper was to study the effect of a new tripodal chelating agent on La1-x Sr x Co1-y Fe y O3-δ perovskite prepared by the complexation method. For this purpose, a phenolic derivative of glycine (L) was synthesized applying the Mannich reaction and characterized by NMR and IR spectroscopies as well as by elemental analysis. To evaluate the complexation capability of L, its formation constants with the perovskite cations were measured. Comparison of these results with those reported for the complexaion with glycine, introduced L as a good candidate for the complexation with Fe(III) and La(III) cations. Furthermore, the powder XRD observations confirmed an improvement in the... 

    Buckling behavior of composite triangular plates

    , Article International Journal of GEOMATE ; Volume 2, Issue 2 , 2012 , Pages 253-260 ; 21862982 (ISSN) Farsadi, T ; Heydarnia, E ; Amani, P ; Sharif University of Technology
    GEOMATE International Society  2012
    This paper is to do a brief research on the buckling behavior of composite triangular plates with various edge boundary conditions and in-plane loads. It may be regarded as a right and simple numerical method for the analysis of composite triangular thin plate using the natural Area coordinates. Previous studies on the solution of triangular plates with different boundary conditions were mostly based on the Rayleigh-Ritz principle which is performed in the Cartesian coordinate. In this method, the energy functional of a general triangular plate is derived and the Rayleigh-Ritz method is utilized to derive the governing eigenvalue equation for the buckling problem. The geometry is presented... 

    A simple model for the size and shape dependent Curie temperature of freestanding Ni and Fe nanoparticles based on the average coordination number and atomic cohesive energy

    , Article Chemical Physics ; Volume 383, Issue 1-3 , 2011 , Pages 1-5 ; 03010104 (ISSN) Delavari, H ; Madaah Hosseini, H ; Simchi, A ; Sharif University of Technology
    To study the effect of size and shape of metallic nanoparticle on their Curie temperature, an analytical model is proposed. The core average coordination number (CAC) and surface average coordination number (SAC) of freestanding nanoparticles are considered in the model. Clusters of icosahedral (IC) and body centred cubic (BCC) structure without any vacancies and defects are modelled. A critical Curie temperature is introduced for metallic clusters with a diameter of 2-3 nm. This critical diameter is related to clusters which the ratio of surface atoms to total atoms is about 50%. The "shape effect" is shown to be important at sizes less than 20 nm. The obtained results are supported by... 

    Resource-Aware protocols for network cost-sharing games

    , Article 21st ACM Conference on Economics and Computation, EC 2020, 13 July 2020 through 17 July 2020 ; 2020 , Pages 81-107 Christodoulou, G ; Gkatzelis, V ; Latifian, M ; Sgouritsa, A ; Sharif University of Technology
    Association for Computing Machinery, Inc  2020
    We study the extent to which decentralized cost-sharing protocols can achieve good price of anarchy (PoA) bounds in network cost-sharing games with nagents. We focus on the model of resource-aware protocols, where the designer has prior access to the network structure and can also increase the total cost of an edge (overcharging), and we study classes of games with concave or convex cost functions. We first consider concave cost functions and our main result is a cost-sharing protocol for symmetric games on directed acyclic graphs that achieves a PoA of 2+ϵ for some arbitrary small positive ϵ, which improves to 1+ϵ for games with at least two players. We also achieve a PoA of 1 for... 

    Modeling component connectors in reo by constraint automata: (Extended abstract)

    , Article Proceedings of FOCLASA 2003, the Foundations of Coordination Languages and Software Architectures, a satellite event of CONCUR 2003, Marseille, 2 September 2003 through 2 September 2003 ; Volume 97 , 2004 , Pages 25-46 ; 15710661 (ISSN) Arbab, F ; Baier, C ; Rutten, J ; Sirjani, M ; Sharif University of Technology
    Reo is an exogenous coordination language for compositional construction of component connectors based on a calculus of channels. Building automated tools to address such concerns as equivalence or containment of the behavior of two given connectors, verification of the behavior of a connector, etc. requires an operational semantic model suitable for model checking. In this paper we introduce constraint automata and propose them as a semantic model for Reo. © 2004 Elsevier B.V. All rights reserved  

    Trust-based coordination mechanism in a divergent supply Chain

    , Article 62nd IIE Annual Conference and Expo 2012, 19 May 2012 through 23 May 2012 ; May , 2012 , Pages 3268-3277 Pezeshki, Y ; Baboli, A ; Cheikhrouhou, N ; Modarres, M ; Jokar, M. R. A ; Campagne, J. P ; Sharif University of Technology
    Institute of Industrial Engineers  2012
    We consider coordination by contract in a divergent supply chain including one manufacturer and several retailers which produces fashion products with short sale seasons. The retailers cooperate with the manufacturer as sales agents; i.e., they work in the framework of revenue sharing contracts. Because of their proximity to the market, retailers can provide more accurate demand forecast for the manufacturer when he wants to decide on his capacity building (expansion), product assignment decision and market prices with regard to retailers stiff due date, different lead times and different price-dependent demand functions. To ensure abundant supply and increase their sales, the retailers have... 

    Modeling real-time coordination systems using timed Bchi automata

    , Article 2011 CSI International Symposium on Computer Science and Software Engineering, CSSE 2011, 15 June 2011 through 16 June 2011 ; June , 2011 , Pages 17-24 ; 9781612842073 (ISBN) Ahmadi Danesh, Z ; Izadi, M ; Sharif University of Technology
    Reo is an exogenous coordination language for synthesizing components participating in a component-based system. The notion of Bchi automaton over streams of records (BAR for short) is a proposed operational semantics for Reo that covers several aspects of coordination strategies such as synchronization, context dependencies and fairness constraints. In this paper and for the purpose of modeling real-time coordination systems specified by Reo, we present a timed version of BARs as the acceptors of timed streams of records. We show that timed BAR and its streams of records based semantics are more standard and also more expressive than timed constraint automaton which is the first proposed... 

    A protocol for constraint automata execution in a synchronous network of processors

    , Article 12th International Conference on Verification and Evaluation of Computer and Communication Systems, VECoS 2018, 26 September 2018 through 28 September 2018 ; Volume 11181 LNCS , 2018 , Pages 80-94 ; 03029743 (ISSN); 9783030003586 (ISBN) Farhadi, A ; Izadi, M ; Habibi, J ; Sharif University of Technology
    Springer Verlag  2018
    In service oriented computing we encounter the problem of coordinating autonomous services (e.g., micro-services) communicate within the deployment environments (e.g., multi-cloud infrastructures) but participate for the functional requirements. While the environments have the deployment concerns like real-time, security, privacy or even energy consumption constraints, for the sake of brevity, the formal models of coordination in service oriented systems generally abstract away these concerns and focus on the functional ones such as synchronization, data and context dependency constraints. In this paper, we consider Constraint Automata (CA) as a formal model of the functional behaviours for... 

    Coordination Investigation of Macrocyclic Ligands Tertiary Amine Groups with [60] Fullerene and Cu(II)

    , M.Sc. Thesis Sharif University of Technology Asadi Mofarrah, Leila (Author) ; Ghanbari, Bahram (Supervisor)
    The reaction of O2N2-donor naphthodiazacrown, with salicylaldehyde afforded new O3N2-donor macrocyclic ligands (L1-3naph) mounted with 1,3-diazcyclohexane subring in high yield. The product was characterized by IR, 1HNMR spectroscopy as well as elemental microanalysis and single crystal X-ray studies (just for L3naph). The interactions of [60]fullerene in presence and absence of base, Cu(II), Hg(II) and Zn(II) with L1-3naph were investigated employing fluorescence spectroscopy. The efficient fluorescence quenching of L1-3naph in presence of C60, Cu(II)( L1-2naph) and the fluorescence enhancement in presence of Hg(II) and Zn(II) indicated that the interaction with [60]fullerene Hg(II) and... 

    Coordination in Cooperative Networks and Secret Key Agreement Using Common Information

    , M.Sc. Thesis Sharif University of Technology Bereyhi, Ali (Author) ; Aref, Mohammad Reza (Supervisor)
    In order to utilize cooperative resources of a network, we have to investigate cooperative networks and strategies. Information theory, by introducing different concepts such as coordination and common information, gives us a suitable tool to study cooperative networks and using their resources. In this thesis, we investigate coordination and secret key agreement in cooperative networks. Our study consists of two parts. In the first part, we consider coordination and its applications in cooperative networks. For this purpose, we introduce the triangular multiterminal network as a proper model for studying empirical coordination in multiterminal networks and establish an inner and outer... 

    Coordination mechanism for capacity reservation by considering production time, production rate and order quantity

    , Article Applied Mathematical Modelling ; Volume 37, Issue 20-21 , 2013 , Pages 8796-8812 ; 0307904X (ISSN) Pezeshki, Y ; Akbari Jokar, M. R ; Baboli, A ; Campagne, J. P ; Sharif University of Technology
    In this paper we study the coordination of a dyadic supply chain producing a high-tech product by contracts. The product has a short life cycle and the buyer faces stochastic demands during the selling period. We consider the production time, which causes the inventory costs on supplier's side. As the supplier builds production capacity in advance, the production rate is limited to the capacity created during the production time. In addition, we take into account the inventory cost and operational cost for the buyer. We examine the model under both full information and partial information updating situations, and propose a coordinating contract for each case. Our analysis includes the study... 

    Coordination by contract for capacity and price decisions considering stochastic and price-dependent demand settings

    , Article 41st International Conference on Computers and Industrial Engineering 2011, 23 October 2011 through 25 October 2011 ; 2011 , Pages 323-329 ; 9781627486835 (ISBN) Pezeshki, Y ; Baboli, A ; Jokar, M. R. A ; Sharif University of Technology
    In this paper, we investigate the simultaneous coordination of price and capacity building decision in a dyadic supply chain which is in the context of capacity reservation problem. While the coordination in this context with stochastic demand and fixed price has been received much attention in the literature, but the price-dependent and stochastic demand has been less considered. There is a price-setting buyer which faces a linear decreasing demand with respect to price. To capture the uncertainty nature of the demand we add a stochastic variable to the demand function. In addition, we incorporate production time and inventory cost in supplier side. We study the model in both additive and... 

    Failure-based equivalence of constraint automata

    , Article International Journal of Computer Mathematics ; Volume 87, Issue 11 , 2010 , Pages 2426-2443 ; 00207160 (ISSN) Izadi, M ; Movaghar, A ; Sharif University of Technology
    Constraint automata are the first-proposed operational semantics of Reo coordination language. They can be composed not only by all well-defined composition operators of labeled transition systems but also by two new operators. The new operators are joining of constraint automata with respect to their common port names and hiding a port name in all transition labels. The operations of these two extra operators depend on the internal structures of the transition labels, while in the others each transition label is considered as a simple entity. An equivalence relation between transition systems is a congruence relation if the replacement of the components of a model by the equivalent ones... 

    Coordinated management of residential loads in large-scale systems

    , Article Studies in Systems, Decision and Control ; Volume 145 , 2018 , Pages 151-171 ; 21984182 (ISSN) Safdarian, A ; Sharif University of Technology
    Springer International Publishing  2018
    Recent developments in communication systems and protocols led to the greater attention of energy industry to future smart grids. As one of the key aspects of smart grids, demand response is a promising tool for increasing the capabilities, efficiency, and reliability of power systems. Demand response programs focus on the flexibility potentials in demand, instead of paying full attention to the efficiency of energy system infrastructures. So far, several utilities around the world have planned to realize potential benefits of flexible demand of their consumers. However, participation in most of the programs is dominated by large industrial consumers. This focus on large consumers is mostly...