Management

Oneonta, NY, United States

Management

Oneonta, NY, United States

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Lokshina I.,Management
International Journal of Mobile Network Design and Innovation | Year: 2011

In this paper, we analyse a decoding algorithm, which corrects both erasures and errors for Reed-Solomon (RS) codes based on the Euclidean algorithm together with the Berlekamp-Massey (BM) algorithm. We present and discuss the implementation of RS codes in the digital video broadcasting (DVB) standards and give a brief review of the new DVB-H standard. Analysis and simulation of the symbol error rate (SER) versus the output SER for the Reed-Solomon code used for the multi-protocol encapsulation-forward error correction (MPE-FEC) block in DVB-H has been conducted. Copyright © 2011 Inderscience Enterprises Ltd.


Lokshina I.,Management | Thomas W.,SUNY College at Oneonta
International Symposium on Wireless Personal Multimedia Communications, WPMC | Year: 2013

The significance, which businesses and governments have placed on the RFID and NFC technologies in electronic article surveillance, the cashless payment systems from credit cards and public transportation tickets to the consumer devices, healthcare, and e-government, involves reviewing requirements for the electronic tags. This paper defines the electronic tag life cycle that follows the product life cycle, considers representative business processes and interacting business entities, classifies the electronic tag usage methods, identifies the electronic tag risks, and summarizes the design requirements for the electronic tags from a business viewpoint to be considered by the RFID and NFC developers. © 2013 NICT.


Gomes L.F.A.M.,Management | De Mattos Fernandes J.E.,Aereo | De Mello J.C.C.B.S.,Federal University of Fluminense
Journal of Advanced Transportation | Year: 2014

This article deals with the problem of decision support for the selection of an aircraft. This is a problem faced by an airline company that is investing in regional charter flights in Brazil. The company belongs to an economic group whose core business is logistics. The problem has eight alternatives to be evaluated under 11 different criteria, whose measurements can be exact, stochastic, or fuzzy. The technique chosen for analyzing and then finding a solution to the problem is the multicriteria decision aiding method named NAIADE (Novel Approach to Imprecise Assessment and Decision Environments). The method used allows tackling the problems by working with quantitative as well as qualitative criteria under uncertainty and imprecision. Another considerable advantage of NAIADE over other multicriteria methods relies in its characteristics of not requiring a prior definition of the weights by the decision maker. As a conclusion, it can be said that the use of NAIADE provided for consistent results to that aircraft selection problem. Copyright © 2012 John Wiley & Sons, Ltd.


Ducato A.,Management | Fratini L.,Management | Micari F.,Management
AIP Conference Proceedings | Year: 2013

In the paper a literature review of the numerical modeling of thermo-mechanical-metallurgical evolutions of a metal in hot forging operations is presented. In particular models of multiaxial loading tests are considered for carbon steels. The collected examples from literature regard phases transformations, also martensitic transformations, morphologies evolutions and transformation plasticity phenomena. The purpose of the tests is to show the correlation between the mechanical and the metallurgical behavior of a carbon steel during a combination of several types of loads. In particular a few mechanical tests with heat treatment are analyzed. Furthermore, Ti-6Al-4V titanium alloy is considered. Such material is a multi-phasic alloy, at room temperature made of two main different phases, namely Alpha and Beta, which evolve during both cooling and heating stages. Several numerical applications, conducted using a commercial implicit lagrangian FEM code are presented too. This code can conduct tri-coupled thermo-mechanical-metallurgical simulations of forming processes. The numerical model has been used to carry out a 3D simulation of a forging process of a complex shape part. The model is able to take into account the effects of all the phenomena resulting from the coupling of thermal, mechanical and metallurgical events. As simulation results strongly depend on the accuracy of input data, physical simulation experiments on real-material samples are carried out to characterize material behavior during phase transformation. © 2013 AIP Publishing LLC.


Buffa G.,Management | Ducato A.,Management | Fratini L.,Management
AIP Conference Proceedings | Year: 2013

In the paper a continuum based FEM model for Friction Stir Welding of different material lap joint made out of thin stainless steel and titanium sheets is proposed. The simulation campaign was made out using the 3D Lagrangian implicit code DEFORM{trade mark, serif} by means of a rigid-visco-plastic approach. The model, already set up and tuned for FSW process of similar materials and geometrical configurations takes into account the different mechanical and thermal behavior of the two materials and the microstructural evolution of the considered titanium alloy in the same joint. Additionally, it is able to predict temperature, phase, strain and strain rate distributions and evolution at the varying of the main process variables. The phase evolution models take into account only the main phases called Alpha, Beta and Alpha+Baeta so that, at the end of the simulation, the complete phase distribution in the welded zone. © 2013 AIP Publishing LLC.


Lokshina I.,Management
International Journal of Mobile Network Design and Innovation | Year: 2012

The paper examines self-similar properties of real communication network traffic data over a wide range of time scales. These self-similar properties are very different from the properties of traditional models based on Poisson and Markov-modulated Poisson processes. Advanced self-similar models of sequentional generators and fixed-length sequence generators, and efficient algorithms that are used to simulate self-similar behaviour of IP network traffic processes are developed and applied. Simulations and numerical results are shown and analysed. Furthermore, simulations with stochastic and long range dependent traffic source models are conducted; and efficient algorithms for buffer overflow simulation in finite buffer single server model under self-similar traffic load are developed and applied. Simulations and numerical results are shown and analysed. Copyright © 2012 Inderscience Enterprises Ltd.


Lokshina I.,Management
International Journal of Mobile Network Design and Innovation | Year: 2012

In this paper, we present the modelling of the dynamic behaviour of an ATM-based, multi-service UMTS core network with calls that belong to one of four service classes and arrive randomly. Arriving calls are granted service based on specific service class, required maximum and minimum bandwidth, and available network resources. Performance of priority-based dynamic capacity allocation, suitable for the wireless system supporting ATM-like traffic is analysed. Scheduling of the ATM cell transmission in each uplink TDMA frame is based on a priority scheme. GoS (blocking probability) and QoS (throughput) parameters for bandwidth sharing policy (BSP) are considered, and partial overlapped transmission link (POL) is implemented. In the modelling, the clustering procedure is developed based on Markov reward models (MRMs), enhanced by the self-organising vector quantification (VQ) and neural modelling. The optimal link occupancy probability distribution is calculated using the neural network, trained with Kohonen rules. Simulation and numerical results are shown. Copyright © 2012 Inderscience Enterprises Ltd.


Lokshina I.,Management | Bartolacci M.R.,Pennsylvania State University
International Journal of Mobile Network Design and Innovation | Year: 2012

The paper recommends an effective approach to estimate probability of buffer overflow in wireless communication networks. The buffer overflow probability in queuing systems is defined as a rare event and can be estimated using rare event simulation with Markov chains. Two-node queuing networks are considered in this paper; and an event of buffer overflow at the second node is studied. Two efficient rare event simulation algorithms, based on the importance sampling and cross-entropy methods, are developed and applied to accelerate the overflow probability simulation with Markov chain modelling. Numerical examples and simulation results are provided. Copyright © 2012 Inderscience Enterprises Ltd.


Gitari W.M.,Management | Gumbo J.R.,Hydrology and Water Resources
36th WEDC International Conference: Delivering Water, Sanitation and Hygiene Services in an Uncertain Environment | Year: 2013

Groundwater is the most appropriate and widely used source of drinking water for many rural communities in Sub-Saharan Africa. Studies reveal that in some of the boreholes, F-concentration may be way beyond the recommended limits. This study evaluates the use of raw unprocessed bentonite clay and its Fe3+ modified form for fluoride adsorption. A series of batch adsorption experiments were carried out to evaluate parameters that influence the adsorption process. Fe3+-bentonite exhibited ? 100 % F-removal as opposed to unprocessed bentonite < 5 % at initial concentration of 10 ppm F-. The Fe3+ modified bentonite exhibited ? 100 % F-removal over the pH range 2-10 decreasing at pH > 10, while the unprocessed bentonite clay showed an increase in fluoride concentration over the same pH range. The results indicate that Fe3+-modified bentonite is a candidate adsorbent for point of use water defluoridation systems for house hold use in rural areas.


PubMed | Management, Lüneburg University, Saarland University and Organizational Behavior Area
Type: Journal Article | Journal: The Journal of applied psychology | Year: 2016

Does making the first offer increase or impair a negotiators outcomes? Past research has found evidence supporting both claims. To reconcile these contradictory findings, we developed and tested an integrative model-the Information-Anchoring Model of First Offers. The model predicts when and why making the first offer helps versus hurts. We suggest that first offers have 2 effects. First, they serve as anchors that pull final settlements toward the initial first-offer value; this anchor function often produces a first-mover advantage. Second, first offers can convey information on the senders priorities, which makes the sender vulnerable to exploitation and increases the risk of a first-mover disadvantage. To test this model, 3 experiments manipulated the information that senders communicated in their first offer. When senders did not reveal their priorities, the first-mover advantage was replicated. However, when first offers revealed senders priorities explicitly, implicitly, or both, a first-mover disadvantage emerged. Negotiators social value orientation moderated this effect: A first-mover disadvantage occurred when senders faced proself recipients who exploited priority information, but not with prosocial recipients. Moderated mediation analyses supported the model assumptions: Proself recipients used their integrative insight to feign priorities in their low-priority issues and thereby claimed more individual value than senders. The final discussion reviews theoretical and applied implications of the Information-Anchoring Model of First Offers. (PsycINFO Database Record

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