In this paper we study a discrete variational optimal control problem for the rigid body. The cost to be minimized is the external torque applied to move the rigid body from an initial condition to a pre-specified terminal condition. Instead of discretizing the equations of motion, we use the discrete equations obtained from the discrete Lagrange–d’Alembert principle, a process that better appr...

When a software design decision has a negative impact on one or more quality attributes, we call it a design problem. For example, the Fat Interface problem indicates that an interface exposes non-cohesive services. Thus, clients and implementations of this interface may have to handle with services that they are not interested. A design problem such as this hampers the extensibility and mainta...

This study investigated the cognitive processes involved in inductive reasoning. Sixteen undergraduates solved quadratic function–finding problems and provided concurrent verbal protocols. Three fundamental areas of inductive activity were identified: Data Gathering, Pattern Finding, and Hypothesis Generation. These activities are evident in three different strategies that they used to successf...

Many alternative coordinate choices exist for the description of the rotational motion of a rigid body Not all the choices are equivalent with respect to their domain of validity for accurate attitude representation or the ease they o er in the control design process In this paper we present two choices of coordinates which seem to be appropriate for two important control problems the stabiliza...

Digital equalisation of room acoustics based on inverse filtering of measured response functions, introduces a number of theoretical and practical challenges. To overcome such problems, inverse filtering based on modified measured responses is proposed, derived via their complex Transfer Function smoothing, so that the processed responses are more perceptually compliant, of lower order and less...

Enterprises should find a new business model for their development, so as to make better use of their own advantages. At the same time, with rapid development of the economy and of science technology, the competition between small and medium-sized enterprises (SMEs) and large enterprises is inevitable, so it is very important for small and medium-sized enterprises to find better ways to improve...