我国数字鸿沟问题的“三农”透视

在信息化进程中,我国面临多重数字鸿沟。其中,我国的城乡数字鸿沟具有“三农”问题的特殊背景。三农问题是造成城乡数字鸿沟的重要因素之一,数字鸿沟也制约了三农问题的解决。为防止城乡差距的进一步拉大,我国应该以科学发展观为指导,采取综合措施治理城乡数字鸿沟。     

数码照相在刑事技术中的应用

数码照相机有其自身的特点、成像原理和程序。在公安实际中 ,数码照相在刑事技术中的应用主要体现为记录刑事犯罪现场、拍照痕迹物证、保存现场照片、拍照辨认照相、运用红外、紫外成像及制作公安教学或宣传软件等等。     

The World on the Box: International Issues in News and Factual Programmes

A report on factual international programmes shown on UK TV in 2003 reveals that the total of hours broadcast is similar that of previous years. However, there has been a drop in the number of programmes on developing countries, and the definition of 'factual international' covers a misleadingly wide range - including game shows and travel programmes. The amount of developing country coverage on terrestrial TV is the lowest since the measurement began in 1989. Many serious programmes on developing countries are now shown exclusively on the new BBC digital channels. It appears that ITV is no longer fulfilling its public service remit to broadcast programmes covering 'matters of international significance and interest'. The proportion of foreign coverage in television news increased in 2003 across all bulletins, as a result of the Iraq war.     

论数码复印机的鉴别

随着信息技术的迅速发展,现代印刷技术不断的更新,数码产品层出不穷,对印刷文件的检验也提出了新的课题。不同类型品牌的数码复印机印刷文件种类不同,个体鉴别也有其不同特征,不同类型原稿经数码复印机印刷后的文件间也有区别。因此,数码复印机统一认定的鉴别顺序应是先判断机型,后鉴定种类与个体。     

数字经济下的生产社会化与企业分工协作:演进与特性

数字经济是以数字化原料为劳动对象,利用数字化劳动资料进行生产活动的经济形式,在此基础上,数字技术经由企业分工协作体系的重塑推动着生产社会化的发展。依据马克思主义政治经济学原理,以企业分工协作为切入点,通过剖析企业间网络化分工协作和企业内部数字劳动过程,可发现并阐明数字经济下生产社会化中的最新进展及其双刃剑特性。该性质表明:数字经济既可以推动生产活动向社会化方向发展而代表更先进生产力,同时也会激化企业分工与社会分工、生产社会化与生产资料私人占有之间的矛盾。由此表明,数字经济下的生产社会化演进必将呈现出企业分工代替社会分工,以及所有制形式由生产资料私有制向公有制形式转变的发展趋势。     

国外数字政府研究二十年:热点聚类、演进脉络和发展趋势——基于Cite Space的可视化分析

本文以Web of Science核心文集库2001-2021年发表的353篇关于数字政府研究的文章为样本,运用Cite Space知识可视化软件,通过关键词共现图谱、关键词聚类图谱、演化路径知识图谱和关键词分析,总结了国外数字政府研究概况、国外数字政府研究热点聚类及其发展脉络。研究发现,从2001年起,国外数字政府经历了技术规制、智慧赋能和价值塑造三个阶段,包括十个重要研究聚类,可被分为知识促进、科技支撑、价值培养和合作体系四大主要研究内容。随着数字时代的新要求,数字科技革新和建设路径优化、公共数字伦理和数字素养提升、国家数字主权和公民数字保护预计将成为数字政府研究的热点问题。     

数字图像处理技术的优势

随着计算机应用软件多种类的开发 ,利用计算机来处理图像已成现实。计算机图像处理技术(也称数字图像处理技术)相对于传统的暗房技术 ,不但具备传统暗房技术制作影像的所有的技巧 ,而且还有许多传统暗房技术不可比拟的优势。数字图像处理技术是摄影艺术再创造的技术 ,可制作完美无暇的照片 ,照片质量比传统暗房技术制作的质量更高,对环境无污染 ,出片速度快、省时、省财、省力、省地方。数字图像处理技术必将取代传统的暗房技术     

Analysis of sensitivity and specificity: precise recognition of neutrophils during regeneration of contused skeletal muscle in rats

In this report, we applied the TissueFAXS 200 digital pathological analysis system to rapidly and accurately identify neutrophils during regeneration of contused skeletal muscle, and to provide information for follow-up studies on neutrophils to estimate wound age. Rat injury model was established, and skeletal muscle samples were obtained from the control group and contusion groups at 1, 1.5, 2, 3, 4, and 6 h, as well as at 1, 3, 5, and 15 d post-injury (n = 5 per group). The expression of nuclei and neutrophils was detected by hematoxylin and eosin (HE) staining and immunohistochemical (IHC) staining. A total of 20 injury site areas of 0.25 mm² (0.5 mm × 0.5 mm) were then randomly selected at all time points. A TissueFAXS 200 digital pathological analysis system was used to identify the positive and negative numbers. Knowledge of five professional medical workers were considered the gold standard to measure the false positive rate (FPR), false negative rate (FNR), sensitivity, specificity, and area under the curve (AUC) of receiver operating characteristic (ROC) curves. As a result, with a staining area of neutrophils from 8 µm² to 15 µm², the FPR was 4.28%–12.14%, the FNR was 12.42%–64.08%, the sensitivity was 35.92%–87.58%, the specificity was 87.86%–95.72%, the Youden index was 0.316–0.754, the accuracy was 82.80%–88.30%, and the AUC was 0.771–0.826. The AUC was largest when the cut-off value of the staining area was 12 µm². Our results show that this software-based method is more accurate than the human eye in evaluating neutrophil infiltration. Based on the sensitivity and specificity, neutrophils can be accurately identified during regeneration of contused skeletal muscle. The TissueFAXS 200 digital pathological analysis system can also be used to optimize conditions for different cell types under various injury conditions to determine the optimal cut-off value of the staining area and provide optimal conditions for further study. Furthermore, it will provide evidence for forensic pathology cases.     

苗族:"神州"土著

根据史学家的研究及考古发现,苗族的祖源故土就在中国,即苗族为“神州”之土著。神州,即中国。《史记》曰:“中国名曰赤县神州。”苗族这个人们共同体,发祥于中国长江、淮河流域,曾北渡黄河挺进中原腹部,并形成名曰“九黎”的部落联盟。“九黎”集团率先开发了“神州”本部。     

Empirical Evaluation of the Reliability of Photogrammetry Software in the Recovery of Three-Dimensional Footwear Impressions

This paper examines the reliability of Structure from Motion (SfM) photogrammetry as a tool in the capture of forensic footwear marks. This is applicable to photogrammetry freeware DigTrace but is equally relevant to other SfM solutions. SfM simply requires a digital camera, a scale bar, and a selection of oblique photographs of the trace in question taken at the scene. The output is a digital three-dimensional point cloud of the surface and any plastic trace thereon. The first section of this paper examines the reliability of photogrammetry to capture the same data when repeatedly used on one impression, while the second part assesses the impact of varying cameras. Using cloud to cloud comparisons that measure the distance between two-point clouds, we assess the variability between models. The results highlight how little variability is evident and therefore speak to the accuracy and consistency of such techniques in the capture of three-dimensional traces. Using this method, 3D footwear impressions can, in many substrates, be collected with a repeatability of 97% with any variation between models less than ~0.5 mm.