2 research outputs found
Simulated annealing approach in back propagation
No full textLooking at the training stage of error-backpropagation algorithm as an optimization problem, in this paper we check two ways of embedding simulated annealing to improve the usual gradient descent method for the achievement of good minima of the error function. The first way refers to a continuous state multilayer perceptron (MLP) and it stands for a random selection of the descent direction around the steepest one. The second way concerns binary states MLP where a backpropagation of the right answer from output to input is realized through a Boltzmann machine
Piedras de la arquitectura milanesa
No full textThe city of Milan lies in a plain with clayey soil well suited to brick-making, but no stone deposits. An ample supply of stone is available, however, in the surrounding hills and mountains, which are connected to the city via both natural and artificial waterways. The types of stone used since Roman times include: granite, marble and gneiss from Ossola Valley; dolomite from Lake Maggiore; detrital limestone from Ceresio Valley; sandstone from the Brianza Hills; black limestone and marble from Lake Como; and conglomerate and sandstone from the Adda River basin. Traditionally, the chief uses have been dimension stone (all stones), column shafts (granite), slabs (marble), moulding (dolomite, limestone) and ornamental (marble, dolomite, limestone).La ciudad de Milán se encuentra en una llanura de suelo arcilloso adecuado para la fabricación de ladrillos pero en la cual no hay yacimientos de rocas. No obstante, en las colinas y montañas circundantes, que están comunicadas con la ciudad mediante vías navegables naturales y artificiales, sí existe una abundante cantidad de piedra. Entre los tipos de piedra utilizados desde la época de los romanos se encuentran granitos, mármoles y gneises del valle de Ossola, dolomías del lago Mayor, calizas detríticas del valle de Ceresio (Lugano), areniscas de las colinas de la Brianza, calizas negras y mármoles del lago Como y conglomerados y areniscas de la cuenca del río Adda. Tradicionalmente, los principales usos han sido la piedra de fábrica (todas ellas), fustes de columnas (granito), losas (mármol), molduras (dolomía, caliza) y ornamental (mármol, dolomía, caliza)
