主动式漏洞检测与修复系统的设计与实现

针对内部网络与互联网物理隔离补丁升级实时性不强、自主研发系统的漏洞较多、复杂关联的代码共享所造成的软件漏洞等问题,文章提出一种新的网络安全漏洞检测与修复系统.该系统由控制台、检测引擎、插件和数据库四大模块组成,其中检测引擎根据用户定制的检测任务信息调度相应检测插件执行并返回结果,插件具体完成信息探测、渗透测试和漏洞修复功能.该系统在结构设计上采取了分层式设计思想,该结构不仅可扩展性强,又保证了系统的稳定性和容错能力;在功能上设计上基于构件化、可定制的思想,确保系统部署使用高效灵活.     

基于DSP的主动视觉系统

为了提高目标检测的快速性与准确性,简化基于粒子滤波的目标跟踪算法中的直方图计算,提高检测和跟踪算法在基于DSP(数字信号处理器)的主动视觉系统上的运行速度,提出了一种基于DSP的机器人主动视觉系统.该系统通过改进的EMCV(embedded computer vision library)与启发式搜索方法,在DSP上实现了AdaBoost检测算法;利用增量式直方图计算算法实现粒子滤波中颜色直方图与边缘方向直方图的计算,将直方图融合到观测模型中,在DSP上实现并优化了目标跟踪算法.实验证实了该主动视觉系统中算法的快速性与系统的鲁棒性.     

Fast Relative Depth Computation for an Active Stereo Vision System

Real-time computation of exact depth is not feasible in an active vision setup. Instead, reliable relative depth information which can be rapidly computed is preferred. In this paper, a stereo cue for computing relative depth obtained from an active stereo vision system is proposed. The proposed stereo cue can be computed purely from the coordinates of points in the stereo pair. The computational cost required is very low. No camera calibration or prior knowledge of the parameters of the stereo vision system is required. We show that the relationship between the relative depth cue and the actual depth in the three-dimensional (3D) space is monotonic. Such a relation is maintained even when the focal length and the vergence angle are changed, so long as the focal lengths of the two cameras are similar. Therefore, real-time implementation in an active vision setup can be realized. Stability analysis shows that the proposed method will be stable in practical situations, unless the stereo camera diverges. Experimental results are presented to highlight the properties and advantages of the proposed method.     

如何建立高效的物流体系

中国有句古谚云:人尽其才,物尽其流.这很好地道出了快捷高效的物资流动对国计民生的重要性.目前,电子商务在中国蹒跚而行,很大程度上也起因于中国现阶段发展相对滞后的物流体系.物流,在昨天、今天和明天都将是企业经营中一个不可或缺的重要环节.     

Motion‐blur evaluation: A comparison of approaches

Abstract— In this paper, the results obtained from two independent evaluations of motion‐blur effects with respect to the agreement between the two different approaches used, imaging and non‐imaging, are analyzed. The measurements have been carried out in different laboratories by different operators without the prior intention of a subsequent analysis as presented here. The resulting data is analyzed to quantify the repeatability of each instrument and, in a second step, the comparability of results from the two approaches is investigated. The imaging approach used in these experiments is based on a stationary high‐speed camera with temporal oversampling and numerical image‐data processing to obtain the intensity distribution on the retina of an observer under the condition of smooth pursuit eye tracking. Results from that approach are compared to results obtained from the evaluation of step responses acquired with optical transient recorders by frame‐period convolution. Measurements are carried out with a first LCD monitor with test patterns of both contrast polarities, with three velocities of translation, and four levels of gray. A second object of measurement is used for investigation of the effect of operator intervention in the process of evaluation of the imaging approach, especially on the determination of the reference levels that are needed for evaluation of the normalized blurred edge (NBE). Possible sources of uncertainties are identified for all approaches and instruments. Based on the analysis of that data, the practicability of step‐response‐based evaluations of the “blurred edge width/time” compared to the results obtained using the high‐speed imaging approach, as long as there is no motion‐dependent image processing, are confirmed.     

浅谈ASP环境下建构线上考试程序

本文就自编的并为本校所应的《线上考试》程序，从实时性，实用性和关联性等角度详细阐述的逻辑建橡和设计技巧。     

Study of an Active Network Management System

Active network is a novel approach to network architecture. It provides a programmable interface for the users and enables them to dynamically inject services into the intermediate nodes. Basing on the active network technology, we design a new distributed management model. After the comparison of traditional network managerfient and the mechanism of the active network management system, this paper introduces the structure of active node and smart packet, the mechanism of management, the packet formats, the language, the design goals of our model and the security of active network.     

Which and How Many Regions to Gaze: Focus Discriminative Regions for Fine-Grained Visual Categorization

International Journal of Computer Vision - Fine-grained visual categorization (FGVC) aims to discriminate similar subcategories that belong to the same superclass. Since the distinctions among...     

如何综合评价HIS

论述了医院管理信息系统的评价要求 ,并通过加权打分法来综合评价HIS软件系统。     

宽基线主动视觉中感兴趣目标的对应技术

在主动视觉系统中,通常需要多个代理对同一场景中的感兴趣目标进行协同处理,以提高系统智能分析感兴趣目标的能力。其中,基于多视几何关系解决感兴趣目标的对应问题是协同处理的基础。一方面,主动视觉系统一般工作在宽基线条件下,这增加了对应问题描述的复杂性;另一方面,主动视觉系统以最佳视角观察目标,因此摄像头需做实时的姿态调整,由此导致的视间几何关系变化进一步加深了对应问题的解决难度。本文基于仿射不变的几何特征,建立宽基线条件下的多视几何关系,并针对频繁使用几何特征不能满足主动视觉系统实时要求的问题,提出一种快速更新多视几何关系的方法,并在多视几何约束下实现对应感兴趣目标的鲁棒标识。实验结果表明,该方法能解决宽基线主动视觉系统中感兴趣目标的复杂对应问题,并能达到实时要求。     

Gaze behavior of spotters during an air-to-ground search

OBJECTIVE: This study was designed to develop methods for evaluating the gaze behaviors of spotters during air-to-ground search and to compare field-derived measures with previous lab results. Secondary aims were to assess adherence to a prescribed scan path, evaluate search effectiveness, and determine the predictors of task success. BACKGROUND: Crashed aircraft must be located quickly to minimize loss of life, often requiring visual search from the air. METHOD: Eye movements were measured in 10 volunteer spotters while they searched from the air for ground targets. Visual acuity, contrast levels, and performance on a lab-based search task were also measured. RESULTS: Results were similar to those of previous lab-based studies of air-to-ground search. Task success could be predicted best from a combination of gaze and laboratory variables, and as in previous research, experience was not one of them. CONCLUSIONS: In both lab and field research, performance is poor. Improvements in air search and rescue success will depend upon improvements in training, the refinement of scan tactics, changes to the task methods or environment, or modifications to parameters of the search exercise. APPLICATION: Spotters were unable to reliably search their assigned area, which has implications for the current search training program and in-the-air protocol.     

设备主动视觉的模板匹配自标定

为简化自动化设备视觉定位平台的标定流程,减少对标准块的依赖并实现标定自动化,本文提出了基于模板 匹配的主动视觉自标定方法,依靠平台运动时拍摄到的图片,实现任意场景目标的识别,然后建立模型对运动位置进行标定; 给出了视觉自标定的原理、流程和容错方法,适用于多目标的情形;整个过程由粗到精分3 圈进行,根据匹配位置自动计算标 定结果,使标定更加实用化与通用化。所提方法成功应用于LED 平面固晶机中,结果表明该方法精度可达13.947μm,能满相 关自动化设备的视觉标定要求。     

主动式KDD系统的设计与实现

介绍了一种主动式KDD系统的思想及其设计与实现。在建模挖掘的基础上主动推送信息，利用感知机模型对用户的反馈信息进行修正，逐步增强系统的推送信息的准确性，从而进一步提高KDD系统的智能性和自动性。     

计算机监控系统仿真开发平台

数字I/O模块与模拟量输入模块是计算机监控系统中最常用的模块。该文设计了用于操作这些模块的通信协议,并用软件进行仿真。开发RS-232/RJ-45与RS-232/RS-232协议转换器,延长了计算机监控的通信距离,实现了计算机监控系统的远程维护与协议截取。用仿真模块和协议转换器构建了计算机监控系统的仿真开发平台。     

信号扩散算法在计算机硬件仿真实验系统中的实现

为了更加有效的管理在计算机硬件仿真实验系统中的信号扩散,本文提出了一种信号扩散算法。算法在实验准备阶段将实验逻辑图转化成为图结构存储,并计算出各器件的信号处理代价;在实验运行期间,利用优先级队列的调度器件的启动顺序,从而动态规划信号的扩散次序。算法的时间复杂度理论分析及对比实验均证明,该算法有效减少了信号在器件中的无效重复扩散,降低了器件工作函数的启动次数,使信号扩散时的时间复杂度得到了极大的改善,大幅提高了实验的响应速度并降低了对系统资源的占用。     

Control of a Camera for Active Vision: Foveal Vision,Smooth Tracking and Saccade

Several characteristics of the human oculomotor system have been suggested to be useful also for active vision mechanisms. Among others, foveal vision and a tracking scheme based on two different modes, called smooth pursuit and saccade have often been postulated or implemented. The purpose of this paper is to formulate a setup in which the benefit of implementing these schemes can be evaluated in a systematic manner, based on control considerations but incorporating image processing constraints. First, the advantage of using foveal vision is evaluated by computing the size of the foveal window which will allow tracking of the largest possible class of signals. By using linear optimal control theory, this problem can be formulated as a one-variable maximization.Second, foveal vision leads naturally to smooth pursuit, defined as the performance that can be achieved by the controller resulting in the optimal size of the foveal window. This controller is relatively simple (i.e., linear, time-invariant) as is to be expected for this control loop.Finally, when smooth pursuit fails a corrective action must be performed to re-center the target on the fovea. Recent results in linear optimal control, provide the necessary tools for addressing this challenging problem in a systematic manner.     

SOBS—an incremental BASIC system

The design and implementation of a conversational BASIC system for ICL 1900 machines is described. The University of Southampton BASIC System (SOBS) is an incremental BASIC interpreter which runs under a variety of operating environments. Fundamental requirement for extensive diagnostic and debugging aids are listed, and their implementation in SOBS is discussed. A brief summary of language features is also incorporated. The use of SOBS over a number of years has proved its usefulness in the construction of production programs for small- to medium-scale applications as well as in the field of education. A number of enhanced features have gradually been added, and it is to the credit of the original design that the necessary amendments did not significantly alter the initial internal structure of the system.     

Automation technology—on the way to an open system architecture

This contribution describes some basic rules for the construction of complex automation systems. It structures the factory from a control-technological view into functional blocks which are related to a 7-layer model of manufacturing technology. Thus, it becomes clear that the present MMS protocols end in the cell control layer in the functional unit of machine control. This unit, however, consists of functional blocks which, for flexible adaptation of future control tasks, should also be configurable and open. The function and communication structure of a factory are shown with a cube model.     

Usage-based reading—an experiment to guide reviewers with use cases

Reading methods for software inspections are used for aiding reviewers to focus on special aspects in a software artefact. Many experiments were conducted for checklist-based reading and scenario-based reading concluding that the focus is important for software reviewers. This paper describes and evaluates a reading technique called usage-based reading (UBR). UBR utilises prioritised use cases to guide reviewers through an inspection. More importantly, UBR drives the reviewers to focus on the software parts that are most important for a user. An experiment was conducted on 27 third year Bachelor's software engineering students, where one group used use cases sorted in a prioritised order and the control group used randomly ordered use cases. The main result is that reviewers in the group with prioritised use cases are significantly more efficient and effective in detecting the most critical faults from a user's point of view. Consequently, UBR has the potential to become an important reading technique. Future extensions to the reading technique are suggested and experiences gained from the experiment to support replications are provided.