用标准化变量方法简化介绍线性模型

用标准化变量方法,对线性回归模型的描述进行了简化,使其统计模型变得直观和容易理解.     

Optimal Goodwill Path to Introduce a New Product

We consider the problem of determining an optimal goodwill path for the introduction of a new product in a market, while looking for the maximum foreseen profit. The foreseen revenue depends on the product introduction time and on the goodwill level at the same time. We focus on the advertising costs associated with the goodwill evolution and assume that the cost function possesses some rather general features which are shared by the cost functions of the Nerlove-Arrow type models. The dynamic optimization problem is discussed in the calculus of variations framework. A few examples associated with special cost functions are discussed in detail.     

“三三”法推行EVA

兵装集团的实践证明,EVA考核是增强企业股东回报意识、提升企业价值创造能力的重要举措,对转变企业经济发展方式和提高企业发展质量起到了重要推动作用。     

极小内射模与极小平坦模

在本文中,我们引进了极小内射模、极小平模模以及M.P环的概念,给出了它们的一些特征刻画,并用这两类模刻画了D edek ind环,VN正则环.     

On Composition series relative to a module

ABSTRACT

A commutative algebra with the identity (a * b) * (c * d) ? (a * d) * (c * b) = (a, b, c) * d ? (a, d, c) * b is called Novikov–Jordan. Example: K[x] under multiplication a * b = ?(ab) is Novikov–Jordan. A special identity for Novikov–Jordan algebras of degree 5 is constructed. Free Novikov–Jordan algebras with q generators are exceptional for any q ≥ 1.

     

On the jacobian module associated to a graph

We consider the jacobian module of a set of squarefree monomials of degree corresponding to the edges of a connected bipartite graph . We show that for such a graph the number of its primitive cycles (i.e., cycles whose chords are not edges of ) is the second Betti number in a minimal resolution of the corresponding jacobian module. A byproduct is a graph theoretic criterion for the subalgebra to be a complete intersection.