After mending the input-output expend chart of wassily leorrtief,combining with the theory of optimum,established the optimal increasing model in dynamic departments economic system that has the control target of direct anti-pollution and the output of direct anti-pollution.

Through adding resources and environmental constraints to the optimal growth model,this paper builds up a dynamicand time-differentiable model to evaluate the energy resources with sustainability taken into account.

But why? A dynamic programming model of optimal growth with technology progress,where social planner must make the decision to put how much a part of the scientific output as resources for further research,can explain this distribution to some large extent,such as the distribution pattern and the shift to later age of peak research output.

An optimal model is presented in this paper,aiming at facilitating cost effective effort allocation among software components so that a quantified system reliability goal is attained.

Aiming at the problem of software system reliability and cost distribution,an optimal model for software component cost distribution based on reliability is proposed.

This paper sets up an optimal model in sustainable regional environment and economic development by taking Jingbo lake area as an example through analysis of environmental and economic system.

New software reliability growth model

A reliability growth model of large-capacity power transformer is presented,together with a description of a method for estimating the parameters and testing the model fitting quality.

Many software reliability growth models (SRGM) based on fault coverage only consider accumulative fault coverage ignoring that gained by every test case.