HEURISTIC AND OPTIMUM SOLUTIONS IN ALLOCATION PROBLEMS

In this paper we present some models and algoritms for solving some typical production planning and scheduling problems. We present the Resource-Constrained Project Scheduling Problem (RCPSP) and algorithms for the determination of maximal couplings with minimal arch length in the graph attached to an allocation problem, and for the determination of the solution of Dirichlet problem and of the potential-voltage problem which appear in a production planning. We develop a model for allocating work among potential VO partners, taking into account fixed and variable work costs and transportation costs.Dirichlet’s problem, conex graph, maximal coupling, RCPS problem, virtual organization, allocation problem

Multidimensional optimization algorithms numerical results

This paper presents some multidimensional optimization algorithms. By using the "penalty function" method, these algorithms are used to solving an entire class of economic optimization problems. Comparative numerical results of certain new multidimensional optimization algorithms for solving some test problems known on literature are shown.optimization algorithm, multidimensional optimization, penalty function

Monolithically Patterned Wide-Narrow-Wide All-Graphene Devices

We investigate theoretically the performance advantages of all-graphene nanoribbon field-effect transistors (GNRFETs) whose channel and source/drain (contact) regions are patterned monolithically from a two-dimensional single sheet of graphene. In our simulated devices, the source/drain and interconnect regions are composed of wide graphene nanoribbon (GNR) sections that are semimetallic, while the channel regions consist of narrow GNR sections that open semiconducting bandgaps. Our simulation employs a fully atomistic model of the device, contact and interfacial regions using tight-binding theory. The electronic structures are coupled with a self-consistent three-dimensional Poisson's equation to capture the nontrivial contact electrostatics, along with a quantum kinetic formulation of transport based on non-equilibrium Green's functions (NEGF). Although we only consider a specific device geometry, our results establish several general performance advantages of such monolithic devices (besides those related to fabrication and patterning), namely the improved electrostatics, suppressed short-channel effects, and Ohmic contacts at the narrow-to-wide interfaces.Comment: 9 pages, 11 figures, 2 table

Relaxation of hole spins in quantum dots via two-phonon processes

We investigate theoretically spin relaxation in heavy hole quantum dots in low external magnetic fields. We demonstrate that two-phonon processes and spin-orbit interaction are experimentally relevant and provide an explanation for the recently observed saturation of the spin relaxation rate in heavy hole quantum dots with vanishing magnetic fields. We propose further experiments to identify the relevant spin relaxation mechanisms in low magnetic fields.Comment: 5 pages, 2 figure

CORPORATE FINANCE THEORIES AND PRINCIPLES: REDUNDANT

Corporate finance participates in economic development of Romania. There are theories and approaches which shape investment decisions and finance decisions. During the euro crisis these theories and approaches failed to emulate reasonable use of such decisions. Romania has remained robust during the euro crisis. Therefore the investment decisions and finance decisions are independent to theories and approaches during the crisis. Theories and approaches are describing the changes in investment decisions and finance decisions.  The explanations are only offered

ROMANIAN BANKS: GROWTH AND ACHIEVEMENT

The banking system has emerged slowly and steadily over a period of time leading in front the economy of Romania. Many challenges have been obstacles to its development.  Certain decisions have benefitted the banks in Romania. There are opportunities which must not be missed. International institutions like European Union, European Central Bank, World Bank and International Monetary Fund have played important roles in the promotion of banks. Still there are challenges and opportunists for the growth and development of banks in Romania

Internationalization of emerging markets multinationals: Strategies

Enormous studies have gone deeper to understand internationalization of emerging markets multinationals and different views have emerged. Despite their best efforts and studies still the strategies on the internationalization of merging markets multinationals are found elusive and incomplete. Internationalization theories are not capable of defining the internationalization of emerging markets multinationals. There are challenges and problems. Global financial crisis can simply dislocate all the strategies of multinationals irrespective emerging markets or advanced markets. Theories are theories and the problems are occurring and reoccurring with various impacts and effects. Theories are with assumptions and the assumptions are neither universal nor sacred. New challenges bring new strategies and new aspirations for success. National problems and national economic policies directly influence the strategies. The microeconomics and macroeconomics do shape strategies silently

Systemic Inflammatory Response Syndrome and Mechanical Circulatory Support Devices

Systemic inflammatory response syndrome is an increased inflammatory state affecting the whole body. Mechanical circulatory support (MCS) is a temporary or permanent form of extracorporeal support that may have an associated complication of an exacerbated inflammatory response to the extracorporeal circuit. This brief review will focus on understanding the complex pathophysiology of inflammatory response to MCS, factors that influence the extent of the inflammatory response, the inflammatory response and outcomes as well as potential therapeutic strategies