查询词典 optimization

The optimization methods of database SQL query were studied and some available query optimization Methods were given out as follows: The incompatible data type should avoid to be used; More redundancy search parameters should be given as join condition in join query; In some condition, the number of note hitted to target was estimated by optimizing implement using the average density; Some other maths operating symbol should avoid to be used as condition parameters in WHERE clause; Some operating symbol and its sentence should avoid to be used also; When the cluster function was used,the WHERE clause should be paied attention to more,and so on.

作者单位：（重庆工学院商贸信息学院，重庆 400050）摘要：数据库SQL查询语句的优化，须注意：避免使用不兼容数据类型；连接查询中应多给连接条件提供一些冗余的搜索参数；某种条件下优化器只能使用其平均密度以估计命中的记录数；避免对WHERE子句中条件参数使用其它数学操作符；避免使用某些操作符及相应语句；聚簇函数的使用应注意WHERE子句。

Then the outlay optimization model and quantity optimization model of combat aircraft in the air-to-air confrontment were established.

应用该模型对某战役想定下的作战飞机进行了经费优化和数量优化，验证了模型的有效性。

The examples indicate that the algorithm has strong pertinence and high efficiency, hi the discrete variable optimization, the problem is solved in the relative quotient method On the base of analyzing the relative quotient method, the conjugate gradient direction is used to modify the old search directions, the iterative matrix of the algorithm, and the method to resolve the discrete variable optimization, the relative conjugate difference quotient algorithm is presented.

离散变量优化算法是从相对差商法开始的，在详细分析相对差上法的基础上，用共轭梯度方向修正原有的搜索方向，并对算法的迭代矩阵进行相关的修改，最终形成一种用于求解离散变量优化问题的RCDQ法。

Parametric evaluation function can condense the complicated multi-objective and multi-constrait problem into a single-objective unconstrained problem, then solved with conjugate gradient method.The parametric evaluation function method decreases the optimization difficulty,and makes the solution away from the boundary of feasible region during the optimization process,which makes all the objectives optimized simultaneously.

参数评价函数把复杂的多目标多约束优化问题转化为单目标无约束问题，然后用共轭梯度法进行求解，不但降低了求解难度，而且使得在优化过程中其解远离可行域的边界，保证了对多目标中所有目标同时进行优化。

Themethod has global optimization ability. The conjuncture point of the ant colony optimization andthe Marr WNN has been found.

本论文找到了蚁群算法与Marr小波神经网络的结合点，并做了相应的改进，首次提出了基于蚁群优化的小波神经网络模型。

Such as conventional thermodynamic system modeling andsimulating methods, which are aimed at simple thermal cycles, are not applicable tosystem modeling and design optimization, system modeling and the precision ofdesign optimization may also give rise to consequentiality infections to systemperformance and characteristic rules.

如针对简单热力循环的传统建模与计算方法已不再适用于大型复杂系统模拟分析及设计优化的需要，系统建模和设计优化的精度对系统性能与特性规律的影响更为显著等。

In this paper, we focused on the Thermal Power Generator unit commitment optimization. A mathematical model is presented and consuming minimization of generator is chosen for its objective function, with the power balance, generation capacity limits, maximum allowable start and stop times limits and time limits taken into consideration. The unit commitment optimization is constrained minimization problem.

本文主要对火电机组优化组合问题进行了研究，提出了机组优化组合的数学模型，该模型以发电总成本最小为目标函数，同时考虑了功率平衡约束、机组输出功率上、下限约束，机组最大允许启停次数和时间约束等约束条件。

This is the optimization method in a way, is a condition for constrained optimization.

详细说明：这个是优化方法中的一种方法，，是一种用于带约束条件的优化。

The key to investigating optimization problems, especially constrained optimization problems, is to design efficient algorithm for solving it.

最优化问题特别是约束优化问题研究的一个核心是设计有效的算法。

Solving constrained optimization problems of improved particle swarm optimization, we want to help.

详细说明：求解约束优化问题的改进粒子群优化算法，希望对大家有所帮助。

You can do some assertiveness training.

你可以进行一些自信训练。

We were well on the path to making a rear-wheel-drive global platform," says Mays."

我们正致力于建立一个后轮驱动的平台，"Mays这样说道。"