基于OPC数据访问标准客户端软件的开发

研究了OPC的基本结构和数据访问标准，重点分析了自动化接口的对象模型。使用Visual Basic编写了一个通用的OPC客户程序，采用了不同的数据访问方法，可以与众多OPC数据存取服务器进行数据交换。     

Offline reinforcement learning with task hierarchies

In this work, we build upon the observation that offline reinforcement learning (RL) is synergistic with task hierarchies that decompose large Markov decision processes (MDPs). Task hierarchies can allow more efficient sample collection from large MDPs, while offline algorithms can learn better policies than the so-called “recursively optimal” or even hierarchically optimal policies learned by standard hierarchical RL algorithms. To enable this synergy, we study sample collection strategies for offline RL that are consistent with a provided task hierarchy while still providing good exploration of the state-action space. We show that naïve extensions of uniform random sampling do not work well in this case and design a strategy that has provably good convergence properties. We also augment the initial set of samples using additional information from the task hierarchy, such as state abstraction. We use the augmented set of samples to learn a policy offline. Given a capable offline RL algorithm, this policy is then guaranteed to have a value greater than or equal to the value of the hierarchically optimal policy. We evaluate our approach on several domains and show that samples generated using a task hierarchy with a suitable strategy allow significantly more sample-efficient convergence than standard offline RL. Further, our approach also shows more sample-efficient convergence to policies with value greater than or equal to hierarchically optimal policies found through an online hierarchical RL approach.     

Application of Visual Basic for Automation of LC-MS Analysis

An approach to customizing the data acquisition and interpretation process of liquid chromatography electrospray mass spectrometry (LC-MS) analysis of compound libraries is presented. Macro programs, using Microsoft Visual Basic, were applied to allow the seamless flow of data from the sample synthesis stage through data acquisition/interpretation and reporting, with minimum user interaction. Logical functions were also incorporated into the macros to allow automated actions to be performed based on experimental results. The application of this approach as a universal method for supplementing the automation process of other instruments controlled by the Microsoft Windows PC platform is also discussed.     

Visual spatio-temporal function-based querying

Visual interfaces are very important for human interactions in cyberworlds. Visual spatio-temporal querying should be one of the basic tools for data mining and retrieval in cyberworlds. In this paper, we propose a novel function-based query model for arbitrary shape spatio-temporal querying. The queries are defined as geometric shapes changing over time. In our model, data are interpreted geometrically as multidimensional points with time dimension or as moving points. The queries are formulated with geometric objects and operations over them to form the query solid changing over time. The proposed query model allows us to pose arbitrary shape spatio-temporal range queries. With the uniform geometric model we integrate visual mining and querying of time-dependent data employing 3D visualization tools. It allows for creating an intuitive visual interface using 2D projections of 3D query shapes. Our approach combines visualization of spatio-temporal data with visualization of the range query formulation employing very compact function-based query model. The implemented visual query system and its visual interface are proposed and described. An example of application of the system in analysis of simulation results in molecular dynamics is considered.     

Visual Analytics for model-based medical image segmentation: Opportunities and challenges

Segmentation of medical images is a prerequisite in clinical practice. Many segmentation algorithms use statistical shape models. Due to the lack of tools providing prior information on the data, standard models are frequently used. However, they do not necessarily describe the data in an optimal way. Model-based segmentation can be supported by Visual Analytics tools, which give the user a deeper insight into the correspondence between data and model result. Combining both approaches, better models for segmentation of organs in medical images are created.In this work, we identify the main tasks and problems in model-based image segmentation. As a proof of concept, we show that already small visual-interactive extensions can be very beneficial. Based on these results, we present research challenges for Visual Analytics in this area.     

VB语言在多参数数据采集中的应用

ＶＩＳＵＡＬ ＢＡＳＩＣ（简称ＶＢ语言）是近年发展起来的一门高级编程语言,与其它高级语言相比,且有编程效率高,功能强,方便快捷,便于阅读,直观和界面友好等特点。特别适用于虚拟仪器及智能化测量控制仪器的编程,本文主要论述了ＶＢ语言的特点及其在参数数据采集和处理中的应用。     

VB调用VC创建的Win32 DLL函数

探讨了Visual C＋＋创建Win32 DLL,Visual Basic对其函数实施调用过程中，命名修饰，调用约定、命名约定的匹配，数据类型对应以及参数传递一致性等问题，并给出了具体的应用实例。     

Windows标准控件在Visual C＋＋编程中的使用研究

Windows标准控件是Windows系统预定义的一些行为标准化了的窗口,一般用于Win-dows窗口应用程序中充当与用户交互的元素,其使用方法是Visual C＋＋程序员应该熟练掌握的。介绍Visual C＋＋编程中常用的Windows预定义标准控件,重点介绍了这些控件编程的一般方法,并给出控件编程的实例。     

基于关系代数的XML数据查询

XML渐已成为Web上数据表示和交换的通用语言。为了有效地利用大量的XML文档,需要研究XML数据查询技术。提出了基于关系代数的XML数据查询方法。XML子句可以用关系代数表达式表示,并通过关系代数操作得到查询结果。该方法为查询XML数据提供了一种简洁和有效的手段。     

电机实验测试系统的软硬件设计

介绍了一种新型电机测试系统的设计,该系统能自动完成三相异步电机及直流电机的常规参数如空裁转速、负载(电流、电压、功率、效率、扭矩、转速)、堵转扭矩的测试,软件在Visual C 6.0环境下开发,结合计算机能够采集数据绘制曲线并供用户处理(数据采集处理、彩色图像显示、数据表格打印、数据存储等功能).     

如何实现限制visual foxpro应用程序安装次数

本文说明如何利用ｗｉｎｄｏｗｓ９５注册表,表限制ｖｉｓｕａｌｆｏｘｐｒｏ程序的安装次数,并给出了具体的实例,为保护软件开发人员合法权益提出了一种可用的方案。     

Optimal path planning of mobile robots for sample collection

In this paper, the problem of path planning for sample collection using single or multiple mobile robots such as Mars rovers is formulated as a mathematical optimization problem involving a performance metric based on the scientific values of the collected rock and soil samples. The posed optimization problem is NP‐hard and more complex than the well‐known Traveling Salesman Problem. Algorithms are proposed for obtaining near‐optimal solutions for both single and multiple robots. Their application is illustrated using real Mars surface data. The dependence of the optimal performance on the number of mobile robots is studied numerically. © 2004 Wiley Periodicals, Inc.     

应用于纳型无人机视觉场景数据集构建的图像采集系统

纳型无人机具有体积小、功耗低的优势,在物联网、智能感知等领域中有重要的应用前景;对于纳型无人机的机载目标检测和目标跟踪等任务,视觉场景数据集对于机载算法的训练具有重要作用;由于受到体积和功耗等因素的限制,使用无人机机载的视觉系统进行场景数据的采集存在传输帧率慢、传输中需要进行数据压缩等问题,进而导致构建的数据集与机载算法处理的实际图像不匹配;因此,为了构建一个高质量的数据集,该图像采集系统以匹配纳型无人机视觉场景数据为目的进行设计,系统通过低功耗图像传感器HM01B0制作的模组获取图像数据,通过ZYNQ的PL单元完成图像数据的处理和图像传感器的控制,PS单元完成图像数据存储和各任务间的调度;实验结果表明,该图像采集系统最高可以达到320*320分辨率下45帧/s的采集速率,与纳型无人机机载视觉系统图像获取速率相匹配,同时采集的图像质量清晰,能够满足纳型无人机视觉场景数据集构建的需求。     

基于曲率的全仿射曲线图像配准

为了解决视点变化造成曲线图像匹配和识别困难的问题,利用全仿射模型建立仿射变换图库,在图库样本中通过曲率信息找出与目标样本相关性最优的样本,从而达到曲线图像匹配和识别的目的。基于曲率的全仿射曲线图像匹配的方法, 首先根据全仿射模型对样本图像建立样本库,对样本库中每一个样本通过等间隔偏移进行采样,然后对采样后的子样本建立曲率样本子集,将目标图像与样本子集中的每一个样本进行快速最近邻搜索算法相似性匹配;最后通过匹配结果,找到最优匹配样本。实验结果表明,基于曲率的全仿射曲线图像配准具有较高的成功率,并且与传统算法相比具有更多的优点。     

基于CDMA无线网络的浮标数据通信系统

在海洋监测中,海洋仪器设备是人类认识海洋、开发利用海洋资源和保护海洋环境的重要技术手段。其中资料浮标是海洋监测的主要手段之一。随着CDMA技术的广泛应用,近年来也被应用到海上浮标的无线数据通讯中。相比之GSM、北斗等通讯方式,CDMA网络具有数据传输量大、成本低等优点。文中以Visual studio2005为工具开发了基于CDMA无线网络的浮标数据通信系统,浮标数据通信系统已在海上正常运行6个月。同时对接收到的数据和波浪骑士及其他仪器进行了对比,通过对比可以说明此系统稳定、可行,接收到的数据真实可靠。     

Center-within-trial versus trial-level evaluation of surrogate endpoints

Evaluation of candidate surrogate endpoints using individual patient data from multiple clinical trials is considered the gold standard approach to validate surrogates at both patient and trial levels. However, this approach assumes the availability of patient-level data from a relatively large collection of similar trials, which may not be possible to achieve for a given disease application. One common solution to the problem of too few similar trials involves performing trial-level surrogacy analyses on trial sub-units (e.g., centers within trials), thereby artificially increasing the trial-level sample size for feasibility of the multi-trial analysis. To date, the practical impact of treating trial sub-units (centers) identically to trials in multi-trial surrogacy analyses remains unexplored, and conditions under which this ad hoc solution may in fact be reasonable have not been identified. We perform a simulation study to identify such conditions, and demonstrate practical implications using a multi-trial dataset of patients with early stage colon cancer.     

远程医疗系统中的视频通信系统开发

在远程医疗系统中,病人通过视频与医生进行实时交流是一项非常重要的功能.为实现远程医疗的视频通信功能,结合当前的通信技术和计算机多媒体技术,在Visual C++开发环境下,利用DirectShow多媒体开发工具,采用RTP(Real-Time Protocol,时实传输协议)通信协议,开发了一个局域网内点对点的视频通信...     

VB调用Windows API函数的方法

本文介绍了在 Ｖｉｓｕａｌ Ｂａｓｉｃ中利用动态连接函数库调用 Ｗｉｎｄｏｗｓ ＡＰＩ函数的方法,并通过实例介绍了部分 ＡＰＩ函数的功能。     

Windows98下乡屏显示的配置及应用编程技术

介绍了Windows98下台计算机带多个显示器以扩大显示桌面的系统配置方法,论述了一机多屏环境下应用程序的开发技术,并给出用VB编写的例子程序。     

Visual Basic在串行通信开发中的应用

介绍了采用Visual Basic6.0实现串行通信的方法,并给出了一个计算机与DSP串行通信的应用实例,给出了串行通信和数据库设计的部分代码,并加以分析,在实际中的应用具有参考价值。