On the base of grain self-sufficiency, following natural laws, such as, the area where is suitable for tree to grow, we plant tree, where suitable for grass to grow we plant grass, or plant both tree and grass . applying linear programming method, synthetically considering ecological benefit, economic benefit and social benefit, regarding minimizing the contradictory between water supply and requirement of agriculture, enhancing the capability of anti-drought, and decreasing the influence of drought as our aims, to provide theoretical bases and scientific methods for adjusting agricultural structure, returning cropland to woodland and grassland, and utilizing water resources sustainablly, and improving ecological environment in semi-arid region 因地制宜,在保证粮食自给的基础上,遵循“宜林则林,宜草则草,林草结合”的原则,运用线性规划方法,综合考虑生态、经济和社会效益,以农业水分供需矛盾最小,增加抗御干旱的能力,减少干旱的影响为目的,调整半干旱区农业结构,为水资源的可持续利用和退耕还林还草,改善生态环境提供理论依据和方法。
And by applying linear programming, the paper analyzes and optimizes data communications market and points out the direction of optimizing the structure of hunan data communications products in the future . on the basis of the above analysis, six marketing strategies are established such as developing the services with different extent according to the three layers, establishing the cooperative alliance of multi-winning instead of win-or-lose one, optimizing the products structure, developing wide-band services in priority and so on 在上述分析和研究的基础上,提出和制订了湖南电信数据通信业务的市场营销策略,包括根据业务模型有重点、分层次抓好业务发展,广泛建立联盟变“单赢”为“多赢”、抓好产品的结构优化调整、优先发展新兴宽带业务等,转换企业经营机制,积极探索新增长点等。