Construction and research of Medical College Online Examination System based on load balance

信息技术、网络技术以及计算机技术都在飞速发展，在当前情况之下，传统的医学教学方法和考核办法面临着日益严峻的挑战。考试不仅是为了甄别学生的学习效果如何，更是反映学生综合素质的一种手段。然而，学校引进的在线考试系统多为通用性的考试系统，在试题和选项上都是传统的文字形式，由于医学院校侧重技能方面的考查，所以本系统将在试题题干和选项的表现形式上进行扩展，因此有必要针对医学院在线考试系统进行设计和研究。 本文首先对相关的技术和理论展开研究，分别介绍了五种关键性技术，最为重点的是对负载均衡技术进行了研究，对负载均衡及其算法策略原理进行了详细介绍。在需求分析层面，本文深入到医学院在线考试系统当中，对其中的...With the development and mature of information technology, network technology and computer technology, the traditional medicine teaching and assessment methods face a growing challenge. Examination is not only a mean to evaluate students’ learning effect but also a mean to reflect the comprehensive quality of students. The introduction of the colleges’ online examination system is generic exam sys...学位：工程硕士院系专业：信息科学与技术学院_工程硕士(计算机技术)学号：X200822104

基于OFDM调制和Nyquist滤波的超宽通道大容量光传输

文章首先概述了产生超宽通道的行业背景,接着介绍了产生超宽通道的两种主要方式;分别阐述了OFDM（正交频分复用）调制方式和Nyquist（奈奎斯特）滤波方式的基本原理和产生途径,分析了这两种方式的优劣特点并进行了比较;最后综述了两种方式的研究现状及今后展望

A fourdimensional microscope for single molecule studies in living cells using astigmatic axial resolution enhancement

<p>An important part of life is to react to the environment and adapt to it. All living cells rely on chemical cascades that form signal pathways, from stimulus to transcription events at the DNA. To know more about these pathways we need tools to visualise the signals.</p> <p>Here is outlined developmental and experimental work on a bespoke microscope system primarily for fast single molecule tracing of proteins in living eukaryote cells. Both hardware and software has been developed. Frame rates and exposure times have been pushed to match the speed of freely diffusing particles in living cells. An EMCCD camera with an electronic gain of 300x and a 5 ms exposure time at 200 frames per second enables this.</p> <p>An astigmatic axial resolution enhancement approach has been implemented to allow tracking with high precision of single fluorescent proteins in real-time in three dimensions in a comparatively large volume. The high resolution in three spatial dimensions and one temporal aim to meet these demands. Software to extract the additional axial information has been developed that can determine axial displacement with 38 nm precision.</p> <p>The microscope system has proven it can find and track small clusters of YPet fluorescent protein in <em>E. coli</em> at short exposure times.</p>This thesis is not currently available via ORA

Visual inertial measurement unit based inertial guide sample estimation method

本发明提出了一种基于惯性引导采样的视觉IMU方向估计方法，即利用IMU的方向估计信息，引导视觉方向估计中匹配点对的采样过程和误匹配点的移除过程。包括基于增益自适应互补滤波器的IMU方向估计、基于尺度旋转不变的特征检测以及基于视觉IMU融合的方向估计三个步骤。本发明方法采用增益自适应互补滤波器，能够在初始迭代过程中剔除明显的误匹配点对，提高了方向估计的准确性；将IMU的姿态估计信息作为初值引入到视觉方向估计中，通过迭代移除误匹配点对，加快了方向估计的进程，有效避免了采用随机初始值带来的运算量大的问题。本发明方法适用性广、鲁棒性好、准确率高，可广泛应用在人体康复训练的动作捕捉过程中