思想状态

The paper investigates both block-type pilot linear minimum mean square error algorithm and IEEE802.16 OFDM channel estimation analysis. Simulation results confirm the block-type pilot structure is more suitable for IEEE802.16 system. An optimal pilot setting algorithm, based on space frequency domain, is explored and the pilot chart is presented. The proposed algorithm finds its application in MIMO-OFDM. Simulation results show the algorithm presents a good approximation to the perfect channel state information curve, with about 2dB difference in SNR. The simulation results also demonstrate the algorithm achieves fairly high stability in the environment of fast fading, performance of the proposed algorithm is better that of pilot training channel estimation.3. Taking into account the characteristics of IEEE802.16 OFDM system, OFDM system simulation platform is constructed in Matlab, exploiting simulink as a tool. OFDM modulation and demodulation simulation system are configured on LabVIEW platform. All the system signal processing is simulated, including defining system parameters, designing modulation model, and verifying all the proposed algorithms under different environments, such as white Gaussian noise, multi-path fading, with or without guard interval etc. Bit error performance is evaluated. The research provides valid theoretical basis for practical OFDM system performance evaluation.4. Taking advantage of software radio, the paper designs a hardware platform with both 256-IFFT/FFT and 512-IFFT/FFT OFDM schemes co-existing in one platform. You can predetermine one from the two schemes to carry out almost the same model function with different system performance and parameter setting.5. Referring to IEEE802.16 standard, the paper proposes a design method for generating signals and frames suitable for laboratory investigations implemented in laboratory environment.6. Based on 6701evm digital evaluation card, combined with analogy front-end, the paper designs a DSP software model to deal with baseband signal processing. An overall OFDM scheme, with modulation and demodulation function, is accomplished.

讨论分析了MIMO-OFDM中一种基于空频域的最优导频设置算法，给出了导频图案，通过仿真实验表明，该算法与理想的信道状态信息曲线非常接近，信噪比差距约在2dB左右，并且在快衰落条件下具有较好的稳定性，其性能要优于基于前导训练的信道估计方法。3、根据IEEE802.16OFDM系统特点，论文分别在Matlab中应用Simulink工具构建OFDM系统仿真平台、在LabVIEW平台上实现了OFDM调制解调仿真系统，模拟了整个系统的信号流程，进行了OFDM仿真系统参数的选择和调制模块的仿真设计、论证各算法性能，并根据各种不同的条件：例如高斯噪声、多径衰落、有无保护间隔等，对系统的误码特性进行了评估，为正确评价实际OFDM系统的性能提供了有效的理论依据。4、论文以软件无线电思想作为指导，提出了以256点IFFT／FFT为核心和以512点IFFT／FFT为核心的两种OFDM算法模式并存于同一个硬件平台、且可预选的方案，它们在参数选取和性能指标上有所差异，均实现了相似的模块和功能。5、论文参考IEEE 802.16无线网络标准的参数设置，针对本设计系统的应用环境和系统硬件的性能速率，提出了一种应用于实验室环境的信号结构、帧格式等参数设计。6、论文基于TI公司的6701evm数字评估板卡，结合模拟前端搭建数字中频平台，设计了基带处理的DSP软件模块并进行系统调试，基本实现了一套完整的OFDM调制解调方案。

Based on probability theory, a method for describing and calculating the collision probability between rendezvous and docking vehicle and debris is presented, and the method involves quantitatively analyzing the collision probability using quasi maximum instantaneous collision probability and total collision probability. The method calculating the indexes is developed, and the input required to perform a calculation includes the respective state vectors, position error covariance matrices and physical sizes of objects involved.(3) Two methods to analyze relative trajectory safety between chaser and target are developed, which are 3-sigma ellipsoid based methodology and collision probability based methodology.

1分析了交会对接各阶段面临的主要轨迹安全威胁，阐述了被动和主动安全策略、目标器的交会对接控制区域等保证交会安全的措施；(2)基于概率思想发展了线性和非线性运动情况下飞行器与空间碎片的碰撞判断方法，提出采用总碰撞概率和拟最大瞬时碰撞概率来综合描述飞行器与空间碎片的碰撞危险程度，推导了通过飞行器和空间碎片各自的状态矢量、位置误差协方差矩阵以及形状尺寸来计算碰撞概率的公式；(3)提出了两种分析追踪器和目标器之间相对轨迹安全的新方法：基于3σ椭球的轨迹安全分析方法和基于碰撞概率的轨迹安全分析方法。

Secondly, after the founding of the put creative prose writing is divided into seventeen years and two stages of potential, Feng Zikai display at the idea of self-creation and "ones" in the tough choices, and in the prose works shown contradictory status the potential to make up for writing the history of the Cultural Revolution in the literature time the meaning of pure literature spoke highly of it.

其次，把建国以后的散文创作分为十七年和潜在写作两个阶段，展现丰子恺的创作思想在自我和&非我&中艰难的抉择，及其在散文创作中呈现出的矛盾状态，并对潜在写作在文学史上弥补文革时代纯文学的意义进行了高度评价。

These commonplaces answer much more to our prejudices than to our convictions.

然而所谓它们是古远的说法，是模糊的、暧昧的，是只能通过&现在&方能理解的；所谓&国际法契约&被明白地看作人类在&自然状态&下所知道的一种&契约&，也要到罗马法律家的用语变成了对罗马法律家的思想方式已不再能理解的一个时代的用语之后才能理解。

This paper considers the design method of robust Kalman filter with uncertain noise for discrete-time linear system. The perturbating upper bound on uncertain covariances which can guarantee performance index of estimation errors is obtained.

确保状态估计性能的离散时间鲁棒Kalman滤波器奚宏生（中国科技大学自动化系合肥230027）摘要讨论了一类具有不确定噪声的离散时间线性系统的鲁棒Kalman滤波器的设计思想和方法。

Researching automatic screen printer,this paper proposes a hardware architecture of motion control system of automatic leadfree screen printer based on PLC,completes software design of motion control system, introduce FSM thinking in the programmingprocess,not only simplifies programming,but also guarantees the stability and reliability of system effectively; solves the problem ofabsolute positioning when motor need switching frequency, guarantees operating speed and motion control accuracy of system.

以全自动锡膏印刷机为研究对象，提出了基于PLC的印刷机运动控制系统的硬件体系结构，完成了运动控制系统的软件设计，将状态机思想引入于PLC程序的编写中，不仅简化了编程，而且有效保证了系统的稳定性及可靠性；解决了电机需要切换倍频时的绝对位置定位问题，提高了系统的运行速度及运动控制精度。

At the same time, the ideological political education of university students is also brought into line with the field of vision of harmonious society.

我们要力求使各因素处于一种相互依存、相互协调、相互促进的状态，从而推进大学生思想政治教育的高效、实效、速效。

In order to increase the naitonal selfrespect and cohesion,historiography shall fully explore the element of traditional national spirit.

江泽民指出：&面对世界范围各种思想文化的相互激荡，必须把弘扬和培育民族精神作为文化建设极为重要的任务，……使全体人民始终保持昂扬向上的精神状态。&

First, characteristics of product models in traditional design and concurrent design are compared. Therefore, thoughts of design object and design process working in the double harness are put forward. And, two typical representation methods of product model, and their localization are expatiated. Concept of generalized engineering semantic feature is defined. State of product design model is expressed. Then, an integrated representation method of product model is advanced. Based on the Pro/Engineer software platform, product-modeling system for product general information model is set up.

首先，分析和比较了传统设计与并行设计中产品模型的特点，提出了并行设计中同时考虑设计对象并行与设计过程并行的思想；在阐述两种典型产品模型表示方法，分析其片面性的基础上，引入了广义工程语义特征的概念，表达了产品设计模型的状态，提出了一种集成的产品模型表示方法；基于Pro/E软件平台，建立了产品广义信息模型建模系统。

First, characteristics of product models in traditional design and concurrent design are compared. Therefore, thoughts of design object and design process working in the double harness are put forward. And, two typical representation methods of product model, and their localization are expatiated. Concept of generalized engineering semantic feature is defined. State of product design model is expressed. Then, an integrated representation method of product model is advanced. Based on the Pro/Engineer software platform, product-modeling system for product general information model is set up.Second, relationships between different product models and approach of data exchange are analyzed.

首先，分析和比较了传统设计与并行设计中产品模型的特点，提出了并行设计中同时考虑设计对象并行与设计过程并行的思想；在阐述两种典型产品模型表示方法，分析其片面性的基础上，引入了广义工程语义特征的概念，表达了产品设计模型的状态，提出了一种集成的产品模型表示方法；基于Pro/E软件平台，建立了产品广义信息模型建模系统。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。