数据挖掘技术在入侵检测系统中的应用探析

该文介绍了入侵检测的重要性以及传统入侵检测的类型和局限性,指出利用数据挖掘技术可以克服这些局限性。提出了基于数据挖掘的入侵检测系统和一种改进的Apriori算法,并对系统结构及各部分的功能进行了分析。该算法应用于此系统来提取用户行为特征和入侵模式特征,提高了整个系统的性能和安全性。     

MODICON Quantum PLC在电厂输煤系统中的应用

在电厂输煤系统中,输送线路一般较长,设备分布比较分散,电厂在满足工艺要求的前提下,需尽量减少劳动定员和降低劳动强度。本文通过介绍MODICON Quantum PLC的特点,并将其与华蓥山发电有限公司电厂输煤系统的工艺要求相结合,分析了如何运用PLC来实现对电厂输煤系统的控制。本应用案例具有一定的参考价值。     

Multi-camera calibration based on an invariant pattern

In this paper we present a method for the calibration of multiple cameras based on the extraction and use of the physical characteristics of a one-dimensional invariant pattern which is defined by four collinear markers. The advantages of this kind of pattern stand out in two key steps of the calibration process. In the initial step of camera calibration methods, related to sample points capture, the proposed method takes advantage of using a new technique for the capture and recognition of a robust sample of projective invariant patterns, which allows to capture simultaneously more than one invariant pattern in the tracking area and recognize each pattern individually as well as each marker that composes them. This process is executed in real time while capturing our sample of calibration points in the cameras of our system. This new feature allows to capture a more numerous and robust set of sample points than other patterns used for multi-camera calibration methods. In the last step of the calibration process, related to camera parameters' optimization, we explore the collinearity feature of the invariant pattern and add this feature in the camera parameters optimization model. This approach obtains better results in the computation of camera parameters. We present the results obtained with the calibration of two multi-camera systems using the proposed method and compare them with other methods from the literature.     

On PH quintic spirals joining two circles with one circle inside the other

The paper derives a spiral condition, for a single Pythagorean hodograph quintic transition curve of G² contact, between two circles with one circle inside the other. A spiral is free of local curvature extrema, making spiral designs an interesting mathematical problem with importance for both physical and aesthetic applications. In the construction of highways or railway routes in particular, it is often desirable to have a transition curve from circle to circle. Here, we treat an open problem on planar quintic spiral segments, called transition curve elements, examine techniques for curve design using the new results, and derive lower and upper bounds for the distance between the two circles. The proposed method is applicable for non-tangent and non-concentric circles.     

视频会议系统研究与应用

视频会议系统采用RADVISION公司的viaIP400 MCU,借助计算机广域网实现与中煤集团各公司的TANDBERG视频会议终端的连接,实现多种会议模式.     

Skeletons for parallel image processing: an overview of the SKIPPER project

This paper is a general overview of the S project, run at Blaise Pascal University between 1996 and 2002. The main goal of the S project was to demonstrate the applicability of skeleton-based parallel programming techniques to the fast prototyping of reactive vision applications. This project has produced several versions of a full-fledged integrated parallel programming environment (PPE). These PPEs have been used to implement realistic vision applications, such as road following or vehicle tracking for assisted driving, on embedded parallel platforms embarked on semi-autonomous vehicles. All versions of S share a common front-end and repertoire of skeletons––presented in previous papers––but differ in the techniques used for implementing skeletons. This paper focuses on these implementation issues, by making a comparative survey, according to a set of four criteria (efficiency, expressivity, portability, predictability), of these implementation techniques. It also gives an account of the lessons we have learned, both when dealing with these implementation issues and when using the resulting tools for prototyping vision applications.     

计算机仿真技术及其应用

近年来,随着控制理论、计算技术、计算机科学与技术的发展,系统科学研究的深入,计算机仿真技术已经发展成为一门新的学科。信息处理技术的突飞猛进,更使得仿真技术得到了迅速发展。计算机仿真技术是分析和研究系统运行行为、揭示系统动态过程和运动规律的一种重要手段和方法。本文主要在介绍计算机仿真技术的发展、计算机仿真的仿真步骤以及仿真的核心技术的基础上谈谈计算机仿真技术的应用。     

高职院校计算机信息管理专业教学改革探索

目前国内高职院校计算机信息管理专业在专业内涵的定位存在着较大的差异，使得该专业培养的毕业生与社会需求不相吻合。文章通过对本专业人才培养存在主要问题的分析，在专业教学改革目标、教学改革基本思路上进行研究和探索，为高职院校计算机信息管理专业的建设和发展提供一些借鉴。     

Panorama light‐field imaging

We present a novel approach to recording and computing panorama light fields. In contrast to previous methods that estimate panorama light fields from focal stacks or naive multi‐perspective image stitching, our approach is the first that processes ray entries directly and does not require depth reconstruction or matching of image features. Arbitrarily complex scenes can therefore be captured while preserving correct occlusion boundaries, anisotropic reflections, refractions, and other light effects that go beyond diffuse reflections of Lambertian surfaces.     

On‐the‐fly generation and rendering of infinite cities on the GPU

In this paper, we present a new approach for shape‐grammar‐based generation and rendering of huge cities in real‐time on the graphics processing unit (GPU). Traditional approaches rely on evaluating a shape grammar and storing the geometry produced as a preprocessing step. During rendering, the pregenerated data is then streamed to the GPU. By interweaving generation and rendering, we overcome the problems and limitations of streaming pregenerated data. Using our methods of visibility pruning and adaptive level of detail, we are able to dynamically generate only the geometry needed to render the current view in real‐time directly on the GPU. We also present a robust and efficient way to dynamically update a scene's derivation tree and geometry, enabling us to exploit frame‐to‐frame coherence. Our combined generation and rendering is significantly faster than all previous work. For detailed scenes, we are capable of generating geometry more rapidly than even just copying pregenerated data from main memory, enabling us to render cities with thousands of buildings at up to 100 frames per second, even with the camera moving at supersonic speed.