Ontology mapping-based search with multidimensional similarity and Bayesian network

Users in enterprise information systems want to efficiently search the information that they need. Although several searching approaches have been proposed so far, they still have the limitation in finding the semantically similar information that users need. To overcome the limitation, it is essential to consider the semantics of user keyword and terms (concepts) stored in the ontology repository and continuously update the ontology repository for information searching. To this end, in this study, an ontology mapping-based search methodology (OntSE) is proposed. The OntSE consists of three phases: ontology building, ontology mapping, and ontology updating. Its objective is to find the terms which have the same semantics with user’s keywords, based on multidimensional similarity and Bayesian network. To show the benefits of the proposed methodology, a case study has been carried out.     

正交频分多址接入系统子载波和功率联合分配算法

提出了一种基于队列和信道状态的准最优的跨层子载波和功率联合分配算法,其优化目标是在保证时延敏感用户服务质量(quality of service,QoS)的条件下,最大化所有时延不敏感用户平均速率的对数效用函数值之和。根据时延敏感用户的队列和信道状态进行子载波和功率联合分配,以满足其QoS要求;然后根据比例公平准则将剩余系统资源分配给时延不敏感用户。为了满足时延敏感用户不同的平均时延要求,引入了时延控制因子。仿真结果表明,该算法不仅可以保证所有时延敏感用户的QoS(平均时延和比特溢出率),还可以在保证时延不敏感用户间平均速率的公平性同时,使时延不敏感用户的吞吐量最大;通过调整时延控制因子可以在用户QoS和系统吞吐量间取得不同的折中,从而满足不同的系统设计要求。     

Wireless device connection problems and design solutions

Users, especially the non-expert users, commonly experience problems when connecting multiple devices with interoperability. While studies on multiple device connections are mostly concentrated on spontaneous device association techniques with a focus on security aspects, the research on user interaction for device connection is still limited. More research into understanding people is needed for designers to devise usable techniques. This research applies the Research-through-Design method and studies the non-expert users’ interactions in establishing wireless connections between devices. The “Learning from Examples” concept is adopted to develop a study focus line by learning from the expert users’ interaction with devices. This focus line is then used for guiding researchers to explore the non-expert users’ difficulties at each stage of the focus line. Finally, the Research-through-Design approach is used to understand the users’ difficulties, gain insights to design problems and suggest usable solutions. When connecting a device, the user is required to manage not only the device's functionality but also the interaction between devices. Based on learning from failures, an important insight is found that the existing design approach to improve single-device interaction issues, such as improvements to graphical user interfaces or computer guidance, cannot help users to handle problems between multiple devices. This study finally proposes a desirable user-device interaction in which images of two devices function together with a system image to provide the user with feedback on the status of the connection, which allows them to infer any required actions.     

C/S与B/S混合模式下通信器材网络管理设计

根据当前军队信息化建设发展的需求,提出了基于C/S结构与B/S结构相结合的方法建立军队中等规模通信器材网络资源管理系统.用户利用B/S结构通过浏览器访问Web服务器,其次通过Web服务器访问SQL服务器数据库,用户利用C/S结构通过访问应用服务器,从而最终达到访问数据服务器.在C/S与B/S模式下,分别使得通信器材网络管理系统把准确的器材战术性能指标以及修理情况,实时的器材进出库信息、全面地科学地展示给使用人员,其次该系统能够提供有限的预测分析性能,为器材的申请、发放、修理提供必要的有用信息.     

一种基于AD HOC网络的车辆定位系统的组网框架设计

本文提出了一种基于AD HOC网络的车辆定位系统的组网框架,着重分析了该网络的路由协议选择及优化措施,它能通过车载设备自动组成一个网络来传送系统的位置信息,控制指令和语音信息等信息,可以取得灵活的组网模式,降低系统的运行费用。     

Design and implementation of user information sharing system using location-based services for social network services

Internet takes a role as a place for communication between people beyond a space simply for the acquisition of information.Recently,social network service (SNS) reflecting human's basic desire for talk...     

基于虚拟现实的设备网络化远程监控系统设计

在设备远程监控系统中,一方面用户要求尽可能多地了解现场设备的信息,另一方面通讯系统的带宽有限,这将导致通讯系统中信息滞后不畅等现象.文章采用Java技术和Java3D虚拟现实技术实现了基于传感器驱动的设备远程监控系统RMMC.RMMC系统一方面通过传感器驱动的设备虚拟现实模型,增强了用户对远程设备的运行状态的掌握;另一方面,由于监控系统的虚拟模型在运行时是先下载到客户端,监控过程中网络传递的只是各种传感器信息,因而大大降低了系统运行时网络中的信息传递量.     

基于网络的虚拟模型库的研制及设计

综合运用 Web技术、数据库技术、可视化方法 ,建立了基于网络的虚拟模型库。详细论述了创建模型、建立数据库、网页制作的有关方法 ,并以可视的界面使用户能够在虚拟模型室中浏览、查看模型、查找信息。有效地提高了用户学习的兴趣 ,激发他们的想象力。     

基于神经网络和遗传算法的变型设计研究

随着社会生产力高速发展,市场中的产品表现出以下趋势:功能标准化、造型多样化。在这两种趋势下,变型设计对产品的市场效益逐渐起主导作用。变型设计需要少数用户参与交流,所获取的用户知识有限,无法推广至整个市场。该文提出的变型设计,先用神经网络学习整个市场范围内的用户知识,然后用遗传算法推断与其最为匹配的设计知识。最后,以手机设计为例,探讨了该方法的应用。     

KNOWLEDGE AND XML BASED CAPP SYSTEM

In order to enhance the intelligent level of system and improve the interactivity with other systems, a knowledge and XML based computer aided process planning (CAPP) system is implemented. It includes user management, bill of materials(BOM) management, knowledge based process planning, knowledge management and database maintaining sub-systems. This kind of nesting knowledge representation method the system provided can represent complicated arithmetic and logical relationship to deal with process planning tasks. With the representation and manipulation of XML based technological file, the system solves some important problems in web environment such as information interactive efficiency and refreshing of web page. The CAPP system is written in ASP VBScript, JavaScript, Visual C++ languages and Oracle database. At present, the CAPP system is running in Shenyang Machine Tools. The functions of it meet the requirements of enterprise production.     

Pupil center detection with a single webcam for gaze tracking

This paper presents a user friendly approach to localize the pupil center with a single web camera.Several methods have been proposed to determine the coordinates of the pupil center in an image,but with practical limitations.The proposed method can track the user’s eye movements in real time under normal image resolution and lighting conditions using a regular webcam,without special equipment such as infrared illuminators.After the pre-processing steps used to deal with illumination variations,the pupil center is detected using iterative thresholding by applying geometric constraints.Experimental results show that robustness and speed in determining the pupil’s location in real time for users of various ethnicities,under various lighting conditions,at different distances from the webcam and with standard resolution images.     

基于Web的机械行业门户网站系统的设计与实现

综合运用软件工程、计算机网络知识和交互设计理念设计实现了机械行业门户网站系统,包括五方面的应用功能：文件资料发布子系统、视频发布子系统、用户管理子系统、信息发布子系统、图片发布子系统。其中,资源的上传维护是该系统的重点与特色,系统支持现有的流媒体视频格式及各种资源的维护,管理员可以设置不同权限,实现对不同用户的管理。     

射流泵水力设计软件开发

结合射流泵国内外优秀水力模型,利用VB.NET开发出了一套射流泵水力设计软件。该软件由欢迎窗体、用户管理、基础理论、水力设计、帮助和链接等模块构成。基础理论部分包括射流泵的基本原理、性能参数、性能曲线和结构组成,为用户提供了较为全面的射流泵的基础理论知识;水力设计提供了设计界面和AutoCAD链接,方便计算和设计。用户在进行水力设计时,除了得到射流泵的主要结构尺寸,还可以绘出射流泵的特性曲线。主界面集输入、输出和操作按钮于一体,操作方便。使用者可以不必花大量时间去研究射流泵的理论和模型,只需要输入初参数就可以得到自己想要的射流泵的尺寸,大大缩短了设计周期。     

基于网络的电路原理实验系统

介绍了基于Internet的电路原理实验系统,它综合运用了网络、电路设计、面向对象编程及数据库等技术,将真实的物理设备与网络相结合,为局域网和Internet用户提供了一个开放的实验平台,使用户可以通过远程登录的方式进行电路原理实验。该实验平台时改进远程教学有很大的意义。     

基于Internet的直流电机实验系统

基于Internet的并励直流电机实验系统融合了网络、自动控制、计算机实时控制和面向对象编程等技术,将真实的物理设备与网络相结合,从而为局域网和Internet用户提供了一个开放的实验平台,使用户可以通过远程登陆的方式进行直流电机类相关实验.该实验平台对远程教学有很大的意义.     

<Emphasis Type="Bold">The Optimal Design of a Cooling System for a Die-Casting Die With a Free Form Surface</Emphasis>

This study is on the finite element and abductive network method application to die-casting dies with free-form surfaces. The study aims to find the optimal cooling system parameters and decrease in deformation of a die-casting die. In order to avoid the numerous influencing factors, the free-form surface of a die-casting die is created as a non-linear Eq. of a polynomial function. The parameters of the cooling system, including the channel space and channel diameter, are adjusted according to the non-linear Eq.. An abductive network has been built for modelling the die-casting cooling parameters. The abductive network is composed of a number of functional nodes. Once the cooling system parameters are given, this network can predict the deformation of the die-casting accurately. A simulated annealing optimisation algorithm with a performance index is then applied to the neural network for searching for the optimal cooling system parameters and to obtain a satisfactory result.     

基于多主体知识集成模型的智能产品报价系统

产品报价历来都是企业面向客户的一项关键和复杂的知识工作,需要综合多种信息和知识.传统的人工为主的报价方式使得报价的准确性和及时性难以保证.本文在多主体知识集成模型的基础上,建立了一个智能产品报价系统,运用网络搜索和智能.推理技术,快速形成产品报价表,并在一个光学产品的报价服务中得到了有效的应用.     

二维非相干OCDMA系统信息侦听技术的研究

传统的能量侦听不能对采用二码键控调制方式的OCDMA系统实施有效信息截取;而多用户侦听多为采用多用户条件下等待出现单用户情况后进行信息截取,当系统用户容量较大时此方法缺乏实时性。本文以二维非相干光码分多址（OCDMA）系统为例,针对以上问题分别设计了不同的信息侦听方案,开展信息侦听技术探讨。首先,假设窃听者对整个系统的编/解码方式、地址码字的构造方式、系统的传输速率以及采用的频率片数量、大小等信息有足够的了解;然后,利用光电检测技术获取OCDMA系统中光信号在不同波段、不同时间的能量分布情况;最后,利用获取的能量分布矩阵可以有效地破译出系统中存在的地址码字。分别将两种侦听方案在利用Optisystem和Matlab软件搭建的二维非相干OCDMA软件平台上进行分析,其中系统采用了7个用户和7组二维地址码。分析结果表明,两种侦听方案均能有效的破译出用户的地址码字,实现对整个系统的信息窃取。可见二维非相干OCDMA系统仍然存在安全性问题。     

CIMS网络辅助设计工具的实现模型

主要论述了CIMS网络辅助设计工具的实现模型。CIMS网络辅助设计工具由三部分组成 :①需求分析模块 ,它主要向用户提供标准的需求分析模板并对信息流量进行量化处理 ;②网络设计模块 ,它从需求分析模块获取相应的信息 ,自动生成初步的网络方案 ,使用者可以根据某些特殊的要求和自己的设计经验对该方案进行必要的调整 ;③性能评价模块 ,它对前面生成的方案进行性能分析、代价估算 ,并把结果反馈给使用者 ,以便再对方案进行调整。     

基于语义网面向机械领域的信息检索技术研究

针对制造业信息技术应用现状，以及信息检索准确性差等局限，本文利用语义网技术和智能主体技术建立一个面向机械设计领域的信息检索模型，并阐述了这两种技术的特点，分析该模型的体系结构及其关键技术。该模型提出了一个新的检索方式，可以使信息具有良好的重用性，并且能从大量的网络资源中获取准确全面的信息，并针对不同的用户，提供详细程度不一的信息和个性化的服务，为以后实现基于语义网的信息集成系统做好准备。