RAID光纤通道适配器设计

在RAID光纤通道系统中,采用光纤接入来提高附网RAID带宽及其通道数传率,改写控制卡BIOS及驱动程序进一步挖掘其性能潜力,设计通道硬联逻辑使数据能高效直接传输到本机和网络用户。提出了用硬件描述语言VHDL描述RAID通道适配器模型。     

船舶防止海洋污染设施专家系统的研究

随着我国航运事业的日益发展 ,船舶对海洋造成的污染也日益严重。根据实际的需要研究开发了一个集声音、图像和文本等多种媒体信息输入、显示、查询和处理于一体的多媒体计算机船舶防止海洋污染的专家系统。该专家系统将实现故障诊断、故障处理、设备管理、运行工况优化、教育咨询等功能 ,对船务公司的机务部门管理所有船舶的防污染设备有重要的现实意义。     

Evaluation of fitting of plastic parts

Abstract

As an example of measurement by touch, fitting of plastic parts was studied. Where such requirement is dependent on judgement made by human senses, a number of characteristics must be measured in order to obtain the mechanical characteristics matching those of touch. The degree of fitting judged by touch is quantified by multidimensional scaling, using capsule-shaped plastic parts. Also, the dimensions, shapes and the degree of mechanical fitting are measured and the relationships of these to the quantified senses determined by factor analysis, multivariate data analysis being effective for this purpose.     

采煤机无线监测系统的设计

为准确获取采煤机的运行状态参数,提出了一种采煤机无线监测系统的设计方案。该系统在采煤机机身的指定部位安装具有特定功能的无线传感器节点,用于采集采煤机的工作信号,该信号由DSP处理后,通过无线MESH网络传至无线网桥AP,再通过光纤传送到中心计算机,中心计算机上的分析软件对接收到的采煤机的工作信号进行分析,并根据预先设定的门限值进行报警或其它处理。现场试验结果表明,该系统运行良好,无线MESH网络的信号强度能够满足采煤机无线监测系统的要求。     

柴油发动机气缸压力和燃烧始点的辨识

在柴油发动机气缸压力的识别过程中，针对缸盖振动信噪比较低的问题，提出了对RBF网络训练样本进行时域统计平均降噪的方法，同时在对燃烧始点的辨识中应用了Kaiser差分器。时域统计平均有效提高了信号的信噪比，对柴油发动机气缸压力的恢复获得了很好的结果；Kaiser差分器有效提高了对燃烧始点的辨识。通过实践证明，该计算方法可以有效地从柴油发动机缸盖振动信号恢复气缸压力，并进一步辩识燃烧始点。     

电缆长度对采煤机变频调速系统性能影响的研究

为了研究长电缆对采煤机变频调速性能的影响,对不同长度牵引电缆进行了加载试验。理论分析和试验研究表明,输出电缆对变频器和电动机的影响与电缆长度有密切关系,随着电缆长度增加,其不良影响明显加剧;可通过优化变频器参数改善电动机负载能力,利用滤波器有效抑制变频器输出谐波,从而减小长电缆对采煤机变频调速系统性能的负面影响。     

A study of the quality of Wikidata

Wikidata has been increasingly adopted by many communities for a wide variety of applications, which demand high-quality knowledge to deliver successful results. In this paper, we develop a framework to detect and analyze low-quality statements in Wikidata by shedding light on the current practices exercised by the community. We explore three indicators of data quality in Wikidata, based on: (1) community consensus on the currently recorded knowledge, assuming that statements that have been removed and not added back are implicitly agreed to be of low quality; (2) statements that have been deprecated; and (3) constraint violations in the data. We combine these indicators to detect low-quality statements, revealing challenges with duplicate entities, missing triples, violated type rules, and taxonomic distinctions. Our findings complement ongoing efforts by the Wikidata community to improve data quality, aiming to make it easier for users and editors to find and correct mistakes.     

基于数据库应用的计算逻辑的实现

在基于数据库的应用系统中,存在着许多数据间的关系,一部分可以通过数据库本身的机制来实现,如主外码引用关系,而另一部分关系是数据库无法维护的,如"进销存"计算关系,目前都是程序员编写代码去实现所需要的这部分关系,而基于代码的实现不利于计算关系的变更和扩展,需要有一种好的便于后期维护的实现方法.     

飞行模拟器成像系统延迟时间检测方法研究

为了检测飞行模拟器成像系统的延迟时间,首次设计了利用PIC单片机进行延迟时间检测的系统;深入分析了模拟器成像延迟的产生原因,并以某型模拟器的成像系统为研究对象,利用该系统对其进行检测,通过单片机与PC机通讯,观察并记录操纵杆与成像计算机亮度信息的变化的采样数据,根据采样程序周期和通讯程序的运行周期15ms,得出系统的延迟时间;解算结果与实际情况相符;此系统成本低、通用性较好,计算精度较高,可达到微秒级,误差较小,还可以为空军提供低成本的测试技术.     

The introduction of ergonomics: A problem of industrial practice

The problem of introducing ergonomics into a major chemical industry was tackled by a novel approach which allowed the industry concerned access to a wide range of ergonomics skills. This allowed appropriate expertise to be applied as necessary to the variety of problems arising in the design of a plant. The problems included equipment design and layout, thermal, auditory and visual environments, job design and training aids. The difficulties of identifying the benefits of such an introduction were dealt with by the use of a senior management seminar which employed a 'paired presentation' format to describe both the various contributions made by the ergonomists to the industry and the evaluation by the individual recipients of such contributions.     

山水画审美境界的变异

中国美学是自然主义的,庄子的"齐物论"和"逍遥游",儒家"仁者乐山,智者乐水"式的与自然比德,魏晋玄学标举清风朗月以为人的胸襟,禅宗虽把世俗与自然看空,而禅者之悟却多与自然有关。中国画史上山水画的发展最为绵延完整,山水画史也是中国哲学和人生观发展史的索引。晋唐、两宋、元、明清不同时期的山水画作品正印证了仙(玄)、神(理)、逸、禅是山水画发展过程中不同阶段的倾向与变异,是中国哲学发展在山水画中的反映。     

自整角机轴角测量模块的设计

自整角机由于具有结构简单、工作可靠和精度高等特点,经常用于轴角的测量。但目前自整角机轴角测量模块都比较复杂,使用不方便,且价格较高。提出一种由单片机发出方波信号,经滤波放大后得到标准正弦波信号,用于自整角机转子激磁,然后,再由单片机测量定子绕组输出的感应电势来获得轴角的方法。根据该方法设计的轴角测量模块电路简单、工作可靠;测量结果以RS232串口输出,便于使用;测量精度高、实用性强。     

Beware of per-pixel characterization of land cover

A simulation experiment was carried out to analyse the effects of the modulation transfer function on our ability to estimate the proportions of land cover within a pixel by linear mixture modelling. In the simulated landscape the proportion of each land cover type in every pixel was known exactly. The standard error of the estimate (SEE) between percentages derived from mixture modelling and the actual land cover percentages was 11%. Substantial improvements in estimating the percentages can be obtained simply by deriving estimates for pixels of twice the original dimensions, the SEE dropping to 4.16%, though this is with the obvious consequence of a final product with a coarser spatial resolution. Alternatively by deconvolving the input bands using a linear approximation of the point spread function the SEE can be reduced by almost as much, namely to 5.11%. If we combine the two approaches, by first doconvolving the bands, estimating the percentages and then aggregating resultant pixels to twice their original linear dimensions, the SEE drops to 2.24%.     

Recognition of texture types of wear particles

Microscopic wear particles are produced in all machines containing moving parts in contact. The particles, transported by a lubricant from wear sites; carry important information relating to the condition of the machinery. This information is classified by compositional and six morphological attributes of particle size, shape, edge details, color, thickness ratio, and surface texture. This article describes an automated system for surface texture identification of wear particles by using artificial neural networks. The aim is to classify these particles according to their morphological attributes and by using the information obtained, to predict wear failure modes in engines and other machinery. This approach will enable the manufacturing industry to improve quality, productivity and economy. The procedure reported in this article is based on gray level co-occurrence matrices which are used to train a feed-forward neural network classifier in order to distinguish among seven different patterns which can aid in the identification of wear particles. The investigated patterns are: smooth, rough, striations, holes, pitted, cracked, and serrated. An accuracy classification rate of 94.64% has been achieved and is shown by a confusion matrix.     

Computer-aided reporting of the results of neuropsychological evaluations of traumatic brain injury

The TBI Report Assistant is designed to perform the types of routine tasks that computers do well, while freeing the skilled psychologist to concentrate on tasks best done by knowledgeable humans. The Assistant is intended for reporting the results of neuropsychological evaluation of traumatic brain injury patients using a standard battery. The program encourages the inclusion of additional information by writing to a disk file suitable for editing with a word processor, rather than directly to the printer. The resulting file contains prompts for summary and interpretive statements by the psychologist.     

Separability of spatiotemporal spectra of image sequences

The authors calculate the spatiotemporal power spectrum of 14 image sequences in order to determine the degree to which the spectra are separable in space and time and to assess the validity of the commonly used exponential correlation model. They expand the spectrum by a singular value decomposition into a sum of separable terms and define an index of spatiotemporal separability. as the fraction of the signal energy that can be represented by the first (largest) separable term. All spectra were found to be highly separable with an index of separability above 0.98. The power spectra of the sequences were well fit by a separable model, which corresponds to a product of exponential autocorrelation functions separable in space and time     

RS-GA-SVM方法在真核生物DNA翻译起始位点识别中的应用

联合运用粗糙集(RS)理论-遗传算法(GA)-支持向量机(SVM)方法研究真核生物翻译起始位点(TIS)的识别。采用RST和GA算法从原始变量中筛选出TIS周围高度保守的位点构成变量集,再采用SVM识别真核生物的TIS。研究处理获得的结果为:采用RS-GA-SVM方法对于真核生物TIS的总识别正确率CP达92.00％,相关系数CO为0.8327;而直接使用SVM方法处理原始变量数据的总识别正确率CP和CO仅为89.87％和0.7885.研究表明,采用RS-GA算法对变量进行筛选,起到了去除冗余信息,提高识别效果的作用,同时也减少了计算工作量。     

RSA算法实现数字签名的研究与应用

在数字签名的应用中,为了加快数字签名的速度,先用HASH算法对要签名的文件计算出一个固定长度的数字摘要,然后用RSA算法对数字摘要进行加密生成数字签名。将文件和数字签名一起发送给收方,收方利用发送方的公钥对数字签名进行解密生成数字摘要1,然后用同样的HASH算法对接收的文件生成数字摘要2,比较两个数字摘要,如果相同,则说明文件没有被更改。在电子公务的公文流转中,将本级和业务上下级单位的公钥都存放在本级有利于便捷的查询、更新公钥,快速的验证数字签名。     

一种地平线与跑道边缘线检测方法

在基于计算机视觉的无人机着陆系统中,利用地平线和跑道边缘线方程解算着陆参数是一种可行的方法。利用计算机视觉和图像处理技术研究了一种地平线和跑道边缘线提取方法,利用Canny算子对原始图像进行预处理,获取图像的边缘信息。提出了一种新的直线检测方法,并利用检测出的直线和图像像素坐标系横坐标的夹角确定地平线和跑道左、右边缘线。实验研究表明:该方法可以在不同的高度、不同亮度图像中有效地检测出地平线和跑道边缘线。     

Comparing hierarchies of types in models of linear logic

We show that two models and of linear logic collapse to the same extensional hierarchy of types, when (1) their monoidal categories and are related by a pair of monoidal functors and transformations and , and (2) their exponentials and are related by distributive laws and commuting to the promotion rule. The key ingredient of the proof is a notion of back-and-forth translation between the hierarchies of types induced by and . We apply this result to compare (1) the qualitative and the quantitative hierarchies induced by the coherence (or hypercoherence) space model, (2) several paradigms of games semantics: error-free vs. error-aware, alternated vs. nonalternated, backtracking vs. repetitive, uniform vs. nonuniform.