用策略

We show that the value function satisfies a free_boundary problem, prove the existence of the optimal policy by variational equation and get the optimal policy.

给出了价值函数满足的自由边界，用求解变分方程的方法证明了最优控制的存在性，并找到了最优控制策略。

This paper has no intention to put forward the ubiquitous educational principles, but has the intention to look for the educational significance in the situation. Against the way so called "top to down" by which most of the educational study deduct the certain theory, this paper prefers to use the collaboration of the way of "top to down "and the way of "bottom to up", but the preferable way is "bottom to up": I go near the world of the teacher's life, listen to the voice of the teacher, I make an attempt to keep the teacher's real situation, motion, chance and feeling, I welcome to invite readers to give an ear to their stories and understand the teacher's personal practical theory, also, expect me to do tiny but deep-ground task for verbalism in the educational study by standing the position on the Chinese reality.

与当前教育研究中大量的从既有理论框架中推演出某种论点并加以论证的所谓"自上而下"的方式不同，本研究更倾向于采取"自下而上"与"自上而下"相结合并以前者为主的策略：走近教师的生活世界，倾听教师的声音，用叙事的方式尽可能保留实践中的情境、流动、机缘、感受，邀请读者一同倾听故事，并以此为基础展开对教师个人实践理论的理解，也期望通过立足中国现实土壤的研究为教育研究本土化做一点哪怕微不足道却是扎实的工作。

This study suggests that 1 Virtual museums should provide information contents based on users' requirements and therefore satisfy users' needs 2 The design of virtual museums has to focus on the usability and enhance the information flow from virtual museums to users. 3 The museum staff needs to create a virtuous circle between a museum's online and physical spaces.

依据本研究结论提出以下建议：（1）对於虚拟博物馆之资讯内容提供应依据使用者的需求而定，以满足使用者之资讯需求为目的；（2）在虚拟博物馆的网站功能设计方面，应注意网站之好用性设计，避免任何干扰使用者接收资讯的错误；（3）加强与实体博物馆的策略合作，协助使用者架构更具学习效果的博物馆经验。

Stores use extremely clever strategies to winkle customers into making purchases.

商店用十分聪明的策略让顾客消费。

Recommendation 7(Biologicals 1):If the treatment target is nor achieved with the first DMARD strategy,addition of abiological DMARD should be considered in case of presence of individual poor prognostic factors(RF/CC P,early erosive disease,rapidly progressive disease,high disease activity).

假如用一线DMARD策略治疗目标未达到，且存在预后不良的因素(RF/CC P抗体阳性；早期骨侵蚀；病情快速进展；病情高度活动)，则加生物制剂。

Regard pursueing "Spiel" of freedom as the starting point, adopt the tactics jeered at, talked in professional jargon, through is it construct to conciliate to traditional subversion of literature, revolt tradition and classics. Embody in theindividual free psychology by "there is no regular following one"s benting and write the experience of life at first, come from compatibly the writing in the form of pluralism.

通过欲望化的本色表达和关注日常生活体验来解构深度，单向度平面地展示&当下&生活；用&戏仿&和&拼贴&的游戏性文本策略制造喜剧性的反讽效果和零碎意象的堆积，拨开严肃的、神圣的缪糕糕意义，让人看到生活最本真的状态；开放互动性的结构打破了作者中心，将读者吸引到创作中来，个人自由叙事得到一个最广阔的相容空间，并由此产生新的文本—&超文本&，为读者提供了一种阅读的自由和精神的自由。

The testing, answering system was developed out by the ASP.net. Two test papers were abstracted from the system by the combination of the certain proportion and binominal distribution mathematical models stragety. The two test papers were tested by 52 students through the cross design. The difficulty and discrimination of items and the reliability and validity of the test papers were worked out with Education Statistics, factor analysis, relative analysis etc.

运用ASP.net技术开发了组卷、答卷、阅卷系统，应用重点等级定额比例分配与难度等级二项分布数学模型相结合的组卷策略随机抽出2套试卷，采用交叉设计对52名预防医学本科学生进行测试，用教育测量学原理、因子分析、相关性分析等方法分析两套试卷试题的难度、区分度和试卷的信度、效度。

It is the first time that the expert control theory is applied to the blasthole drill control described in the paper, where the expert control structure and strategy for blasthole drill control are studied. At last, an integrated software for the expert control is compiled with Borland C++4. 0 under the operation system of Windows95. It includes the following functions: the simulation for control theory and control structure, the realization of the blasthole drill control.

作者用Borland C++4.0在Windows95环境下编制了专家控制的集成软件系统，一方面对控制方案及算法进行了仿真研究，另一方面针对YZ-55型牙轮钻机的实际工况设计了软件控制功能；并按照牙轮钻机钻进控制的专家控制体系与控制策略，在实验室对控制算法与控制硬件系统进行了实验验证。

The main achievements of the dissertation are as follow:(1) Simulation models of inventory systems are built based on decrete event system.

用系统仿真方法求解最优库存策略时，其难点之一在于仿真的优化。

The constitution mode and inclusion information of assembly drawings has been analyzed according to the expression contents and demand of rolling mill assembly drawings. The dendriform assembly model has been setup to express the assembly drawings contents. Under AutoCAD graphic environment, assembly drawings are realized with parts consolidation technology. Generating of local view, dimensioning, technical requirement, expression of list and title panel has been realized too. Generating of parts has been discussed and processing strategy of parametric drawings has been pointed out.

根据轧机装配图的表达的内容和要求，分析装配图的构成方式和应包含的信息，提出了建立树状装配模型来表达装配图的内容，基于AutoCAD图形环境，采用了用零件图拼装实现装配图生成的解决方案，并实现了装配图中有关局部视图的生成、尺寸标注、技术要求、标题栏和明细表的表达，并讨论了零件图的生成问题，提出了参数化绘图数据的处理策略，即利用PDB可编程对话框工具，设计了零部件的参数化编程框架，完成了工作辊、支承辊、机架等零部件的参数化编程。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。