Here we consider some non-autonomous ordinary differential equations of order n and present some results and theorems on the existence of periodic solutions for them, which are sufficient conditions, section 1. Also we include generalizations of these results to vector differential equations and examinations of some practical examples by numerical simulation, section 2. For some special cases t...

For a manufacturing company, moving from selling a product to selling a function is a process called "servitization", leading to the suggestion of an offer oriented functionality that is more commonly called a Product-Service System (PSS). This process requires for a company to have a relatively clear vision of possible scenarios. Under the ServINNOV project, we proposed after a deep analysis o...

This work proposes a differential evolution algorithm to control vehicle-to-grid (V2G) system based on photovoltaic generation and energy cost curves, constraints associated with the power converters’ operation, battery charging strategy, initial budgets. The is designed trade off batteries’ state of charge profits gained from selling grid. To achieve this balance, fuzzy controller employed act...

While scheduling transmissions in a wireless communications system can result in significant power savings, a realistic scheduling scheme must take into acvount practical constraints that apply to wireless transmitters. Here, we examine scheduling actions for power efficiency under the constraints that physical transmission may be carried out at a set of fixed non-zero rates. For this class of ...

Considering a positive portfolio diffusion X with negative drift, we investigate optimal stopping problems of the form inf θ E f  Xθ sup s∈[0,τ ] Xs   , where f is a non-increasing function, τ is the next random time where the portfolio X crosses zero and θ is any stopping time smaller than τ . Hereby, our motivation is the obtention of an optimal selling strategy minimizing the relativ...

Nowadays, many dynamic problems can be efficiently modelled as Constraint Satisfaction Problems (CSPs). These constraints may be on-line non-binary constraints that traditional CSP solver can not manage directly. It is well known that any non-binary CSP can be transformed into an equivalent binary one, using some of the current techniques. However, this transformation may not be practical in pr...

the main design objective of axial compressor is the efficiency increasing, pressure ratio and weight loss. these three parameters are used as an objective function and they are computed according to adopted design procedures. in this paper, a design method is presented that named quasi-three-dimensional. physical flow conditions are applied to design by some constraints to avoid irrational res...