一种结合局部对称的三维模型对齐方法

对称是自然界大多数模型具有的一种特征属性.针对三维模型坐标归一化过程中模型的对齐问题,提出了一种结合局部对称的三维模型对齐方法.通过三维模型的CPCA坐标轴确立其初始姿态,提出局部对称长度比来度量三维模型的局部对称性.以此为依据将三维模型分成两类,对于具有大于或等于2个局部对称平面的三维模型,利用最大局部对称长度比来确立最终姿态;对于仅有1个或没有局部对称平面的三维模型,通过面积替换质量,将模型达到力矩平衡时的姿态确立为最终姿态.算法既考虑到了模型的对称性质,又考虑了非对称模型的处理.实验结果显示了算法的有效性.     

自动查询比对信息系统在生物活性肽分析中的应用研究

本文论述了利用计算机技术解决生物活性肽序列比对的软件系统的研究与开发，以实现生物肽活性功能的预测。本软件系统综合计算机科学和生物科学技术，利用计算机实现对生物信息进行自动采集、处理、存储、分析，把蛋白质序列用虚拟酶虚拟水解后产生的大量虚拟生物肽数据，连续地自动地输送到数据库里查询并比对，从而实现对功能性蛋白质(肽)的活性部位的研究。特别是优化的算法，使得软件系统方便快捷地把数据输送出来，用户可根据需要浏览数据，预测虚拟生物肽的生物活性，从而为生物试验不仅节省了大量的时间，而且还节省了大量的人力，物力和财力。     

柴油机曲轴早期断裂分析

采用宏观断口分析、化学成分分析和显微组织检验等方法对增压柴油发动机曲轴发生断裂的原因进行了分析。结果表明,曲轴材质符合技术要求,而热处理后的校直过程存在问题,由此留下了隐患,造成该曲轴在运行过程中产生疲劳裂纹而断裂。提出了改进措施,杜绝了此类事故的发生。     

初探地球潮汐对静力水准系统的影响

介绍了当前用于粒子加速器准直测量及监测地球潮的静力水准系统。根据地球潮汐(包括海洋潮和固体潮)理论,分析了地球潮汐对静力水准系统的影响,并对获得数据进行频谱分析,得出潮汐周期约为11.6、23.1和7.7 h,即半日潮汐、周日潮汐、1/3日潮,初步验证了地球潮汐对HLS的影响。     

上海EBIT装置的机械准直

采用准直望远镜对上海电子束离子阱(EBIT)装置进行机械准直,制定了合理的准直方案,设计了高精度的机械调节机构和良好的准直工艺,并进行了试验.通过准直,各组件的位置精度均达到设计指标,目前上海EBIT可以稳定运行在高压100keV和束流110mA的条件下.     

某微型电动汽车前悬架系统性能分析与优化研究

应用多体系统动力学软件ADAMS/Car建立某微型电动汽车前悬架仿真模型,并进行悬架性能分析研究。针对主销内倾角、前束角、磨胎半径随车轮跳动变化不理想的现象,应用ADAMS_Insight模块进行仿真模型的灵敏度试验分析,选定对前悬架运动特性灵敏度影响较大硬点坐标,采用DOE Response Surface控制策略拟合车轮定位参数及磨胎半径的二次响应面函数,结合MATLAB遗传算法工具箱进行硬点坐标优化。结果表明,ADAMS和MATLAB遗传算法工具箱在悬架定位参数优化中的联合应用,可使前悬架具有较理想的运动特性。     

Understanding the impact of nurses' perception and technological capability on nurses' satisfaction with nursing information system usage: A holistic perspective of alignment

Based on the holistic perspective of ‘alignment’, evaluating the alignment of human–computer interaction is crucial to ensure effective information system implementation and a positive impact on performance. This study aims to examine the impact of alignment between the nurses' perception of NIS (Nursing Information System) performability and technological capability of NIS achieving success on nurses' satisfaction and nursing care performance through the perspectives of alignment as covariation and alignment as profile deviation. A quantitative method and a cross-section design were used to collect data from 531 registered nurses in Taiwan. The results indicate that the coalignment of nurses' perception of NIS performability and the technological capability of NIS achieving success has a positive impact on nurses' satisfaction with NIS usage. Consequently, nurses' satisfaction will increase with the improved performance of nursing care. The results of this research will help the management of NIS application and development within the context of nursing care.     

Sparse LCS Common Substring Alignment

The “Common Substring Alignment” problem is defined as follows. The input consists of a set of strings S₁,S₂…,S_c, with a common substring appearing at least once in each of them, and a target string T. The goal is to compute similarity of all strings S_i with T, without computing the part of the common substring over and over again.In this paper we consider the Common Substring Alignment problem for the LCS (Longest Common Subsequence) similarity metric. Our algorithm gains its efficiency by exploiting the sparsity inherent to the LCS problem. Let Y be the common substring, n be the size of the compared sequences, L_y be the length of the LCS of T and Y, denoted |LCS[T,Y]|, and L be max{|LCS[T,S_i]|}. Our algorithm consists of an O(nL_y) time encoding stage that is executed once per common substring, and an O(L) time alignment stage that is executed once for each appearance of the common substring in each source string. The additional running time depends only on the length of the parts of the strings that are not in any common substring.     

级联卡尔曼滤波在初始对准中的应用

针对微惯组测量误差大,尤其是陀螺仪误差较大,不能辨别地球自转角速度,造成捷联惯性导航系统不能实现自对准的问题,采用GPS和磁强计辅助微惯组进行对准。当载体处于静止状态时,没有外力作用,加速度计仅输出重力加速度信息,可提供水平姿态角的观测信息,航向角观测由加速度计和磁强计的输出融合解算得到,通过构建级联的四个卡尔曼滤波器,分别实现水平姿态角、航向角、陀螺仪误差、失准角和加速度计零偏的估计,将估计的姿态角转换为待修正的姿态矩阵,利用估计的失准角对姿态矩阵作进一步修正,最终得到修正的姿态矩阵,完成初始对准目的。     

A ‘context-aware’ and agent-centric perspective for the alignment between individuals and organizations

The enterprise modeling field aims at representing organizations from several, inter-related perspectives. A number of enterprise modeling frameworks have been developed providing models, methods and tools that enable to communicate the structure and processes of organizations. These frameworks have been used both for systems development and organizational analysis ends, where the latter mainly focuses process (re)design efforts. We argue that enterprise modeling frameworks can be used for other kinds of organizational analysis. In particular, they can be used to capture and model work practices, human multitasking at work, and to compare models describing pre-defined behavior with actual execution.