突破网络限制的下载利器

请问你通常使用什么下载工具?Netants、Flashget还是GetRight?或者Go!zilla?的确,它们都是下载工具中的精品,无论你用其中哪一款,都是不错的选择。这些工具支持多线程下载,可以明显加快下载速度,这对于广大拨号上网的用户而言,显然是非常重要的。不过,遇到有一种情况,这些精品就无能为力了。那就是,现在某些藏有好东西的站点,往往会限制带宽、限制单个IP连接数目。这样,精品也只能降格为次品,打开一个线程慢慢下载吧,一部一小时左右的电影,有时要下载一天时间。如果谁不信邪,硬要打开多线程,结果可能更惨,IP被对方封掉,反而一个字节也下不了!现在,有人培育出了一种“神奇动物”,专门破解这种阵法,     

用Java实现Web下载技术的探讨

本文介绍了使用Java技术实现整个Web网站下载和解析的方法。根据该方法开发的系统采用灵活的可定制的方式实现下载，下载过程中对网站的各种类型资源进行解析并分类保存到本地文件或者数据库中，以方便今后对这些数据进行进一步的操作。     

QoS Driven Parallelization of Resources to Reduce File Download Delay

In this paper, we propose a novel approach for reducing the download time of large files over the Internet. Our approach, known as Parallelized File Transport Protocol (P-FTP), proposes simultaneous downloads of disjoint file portions from multiple file servers. P-FTP server selects file servers for the requesting client on the basis of a variety of QoS parameters, such as available bandwidth and server utilization. The sensitivity analysis of our file server selection technique shows that it performs significantly better than random selection. During the file transfer, P-FTP client monitors the file transfer flows to detect slow servers and congested links and adjusts the file distributions accordingly. P-FTP is evaluated with simulations and real-world implementation. The results show at least 50 percent reduction in download time when compared to the traditional file-transfer approach. Moreover, we have also carried out a simulation-based study to investigate the issues related to large scale deployment of our approach on the Internet. Our results demonstrate that a large number of P-FTP users has no adverse effect on the performance perceived by non-P-FTP users. In addition, the file servers and network are not significantly affected by large scale deployment of P-FTP.     

Using Content-Based Search to Download Digital Video into a Client Station

In this paper we examine a content-based method to download/record digital video from networks to client stations and home VCRs. The method examined is an alternative to the conventional time-based method used for recording analogue video. Various approaches to probing the video content and to triggering the VCR operations are considered, including frame signature matching, program bar-code matching, preloaded pattern search, and annotation signal search in a hypermedia environment. A concept of go-ahead-downloading is introduced and system capacity of the downloading device is evaluated. Some experimental studies are conducted on preloaded pattern search to provide more insights into this approach. Our results show that with the option of go-ahead-downloading, some content-based search operations can be effectively used for downloading digital video.     

PXA270中CF卡烧写的BootLoader实现

介绍了基于Intel PXA270处理器平台,利用CF卡烧写Linux映像文件的BootLoader实现方法.在叙述了用CF卡烧写Linux的优势后,介绍了CF卡烧写BootLoader的流程,并详细阐明了CF卡的读取方法和FAT格式的代码实现流程.     

学校信息化,该走向何处

重点讲述了SIP(School Infomation Portal校园内部统一信息平台)的主要功能架构以及开发的技术架构,讨论了如何满足学校越来越多的信息化需求,并实现校园内的信息共享,避免了不同部门,不同应用系统的信息孤岛问题.     

电信业将走向何方？——由AT＆T没落所想起的

2004年7月22日,曾经是美国电信业的骄傲也是全球电信业发展楷模的AT&T,宣布将从美国住宅电话用户市场撤退,这在全球电信业犹如一颗重磅炸弹。全球传统电信运营商不禁扪心自问:难道全球电信业进入2003年后的缓慢复苏仅仅是昙花一现?电信业将何去何从?AT&T滑入深渊1876年,贝尔发明了电话,同时创立了贝尔系统。20世纪初,原贝尔系统通过自身发展和兼并竞争对手(独立电话公司)形成了AT&T。回顾AT&T的百年发展,虽然合并不断,但内部主要经历了四次重大变革(拆分)。1.1984年1月,AT&T“一分为八”1912年,美国联邦政府以“AT&T奉行扩张主义,企…     

电信业将走向何方?--由AT&T没落所想起的

2004年7月22日,曾经是美国电信业的骄傲也是全球电信业发展楷模的AT&T,宣布将从美国住宅电话用户市场撤退,这在全球电信业犹如一颗重磅炸弹.全球传统电信运营商不禁扪心自问:难道全球电信业进入2003年后的缓慢复苏仅仅是昙花一现?电信业将何去何从?     

Where We At? Mobile Phones Bring GPS to the Masses

Child tracking is just one of a host of mobile-phone applications that use GPS technology. Other applications include those for tracking the whereabouts of friends, pets, and employees, and those that let farmers survey and navigate their land, hikers create routes and download maps, and skiers check snow conditions and reserve seats on backcountry helicopters. Although consumers have yet to embrace such products en masse, application vendors who follow market predictions are no doubt hopeful. In its September 2006 US Wireless Business Location-Based Services 2006-2010 Forecast report, IDC predicted that more than half of US mobile-phone users will begin using location-based services within four years. The report also notes, however, that fewer than 2 percent of US mobile-phone users currently take advantage of such applications     

Measuring the Sense of Presence and its Relations to Fear of Heights in Virtual Environments

This article describes a study in which a genuine effect of presence--the development of fear of virtual stimuli--was provoked. Using a self-report questionnaire, the sense of presence within this situation was measured. It was shown that fear increased with higher presence. The method, which involved 37 participants, was tested and validated with user tests at the Bauhaus University. A growing body of research in human-computer interface design for virtual environments (VE) concentrates on the problem of how to involve the user in the VE. This effect, usually called immersion or the sense of presence, has been the subject of much research activity. This research focuses on the influence of technical and technological parameters on the sense of presence. However, little work has been done on the effects of experienced sense of presence. One field in which a sense of presence is necessary for the successful application of VEs is the treatment of acrophobic patients. Our goals are to (a) create a theory-based self-report measurement for presence and (b) measure presence independently from specific effects to validate the measurement. The anxiety resulting from the confrontation with a virtual cliff is used to validate the measurement of presence.     

星世界计划推出三星五地消费者先受益

2009年8月31日,三星电子在辽宁、河南、广东、云南、浙江五个地区同时举行了星世界发布.业内人士指出,这标志着三星在销售渠道上的布局和纵深拓展开始加速,而渠道优化、终端整合已成为消费电子行业的大势所趋,行业裂变将再次升级.     

Sales and Use Taxation in E-Commerce: Where We Are and What Needs to be Done

As sales through the Internet have increased, states have sought to force remote sellers to collect and remit sales/use taxes. In response to the U.S. Supreme Court's Constitutional obstacles, the Streamlined Sales Tax Project (SSTP) was organized in 2000. SSTP is a voluntary effort by a number of states to address the Constitutional problems and reduce the burden of sales tax administration for all sellers in all types of commerce. This article examines the current state of the law and the major problems surrounding the SSTP.     

Where to put the creases? Interactions between hand length,task, screen size,and folding method on the suitability of hand-held foldable display devices

Limited information is available regarding ergonomic foldable display device forms. This two-stage study involving young South Koreans (divided into three hand-length groups) was conducted to determine ergonomic forms for hand-held foldable display devices considering folding/unfolding comfort and preference. Stage I obtained the suitability of three screen sizes for five tasks. Stage II evaluated 14 different bi- and tri-folding methods considering screen size, folding direction, and folding time. The effects of hand length were all non-significant. Screen size preferences were task-dependent; small screens were preferred for making calls, and medium screens for web searching and gaming. Folding methods affected folding/unfolding comfort and preference; outward screen and Z-shape screen folding were the most preferred bi- and tri-fold concepts, respectively. Screen protection and access appeared to be competing factors in the user preference determination process. Foldable screen size and folding method should be determined by considering tasks, folding/unfolding comfort, and user preferences.

Practitioner summary: A 13.5?cm screen was preferred for making calls, whereas a 17.5?cm screen was best for web searching and gaming. An outward bi-fold screen concept with a 17.5?cm screen and Z-shape tri-fold screen concept with a 22.9?cm screen were preferred. Overall, the Z-shape concept was most preferred.

Abbreviations: SD: standard deviation; ANOVA: analysis of variance; H: Height; W: Width; T: Thickness