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1.
Multimodal as digital literacies are,they have still been text-based.It has been a great concern that due to the popularity of speech-like writing style online,digital literacies have brought informal speech expressions into formal standard writing,and thus increasing the possibility to ruin the standard writing language.On the other hand,although there are moral panics of the survival of standard written languages,scholars and popular media show great tolerance for online languages.In addition,it has been proved that some frequent participants in digital literacies nowadays are capable of both online language and standard offline language,indicating that they are well aware of the different registers of language use and therefore of high language literacy.Furthermore,researches suggest several possible merits of digital literacies,including saving young people from social isolation and depression,providing people with more opportunities to learn new things and to practice the instructional writing,calling for thorough consideration and elaborate editing and encouraging brief and clear writing style. 相似文献
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INTRODUCTIONDue to the ease of transmitting digital data and copying without loss of quality, the unauthorized distribution of digital multimedia contents has be-come easy and popular. Digital watermarking is the most promising technique to protect the copyright of digital multimedia contents (Cox et al., 2001). Most of the proposed watermarking schemes are symmetric, in which keys for watermark detecting are identical to those for watermark embedding. Therefore, symmet-ric watermarking s… 相似文献
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A new absorbing boundary condition(ABC) for frequency-dependent finite-difference time-domain algorithm for the arbitrary dispersive media is presented.The concepts of the digital systems are introduced to the (FD)^2TD method.On the basis of digital filter disigning and vector algebra,the absorbing boundary condition under arbitrary angle of incidence are derived.The transient electromagnetic problems in two-dimensions and three-dimensions are calculated and the validity of the ABC is verified. 相似文献
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With the development of modern open and distance education, which is characterized by Web-based instruction, Web-based assessment, and Web-based research. Web-based learning support services are considered as the most essential inputs for digital immigrants, which offer ground for them to produce considerable outputs so as to achieve better learning outcomes. This paper examines the current situation of digital immigrants in Yunnan Open University （YNOU）, with significance of finding out specific problems so as to provide effective learning support services to solve the problems in the process of open and distance learning. Open and distance education is the instruction under digital technology by using computer as a key means of media. A digital immigrant is an individual who was born before the existence of digital technology and adopted it to some extent later in life. For considering the outreach location of Yunnan, digital immigrants are at their suitable ages of studying. Some of them cannot understand the value of digital technology completely, and some fail to implement modern technology into their daily lives. Drawing on such findings, Web-based learning support services in YNOU for digital immigrants are significantly worth studying, because they are definitely related with successful learning outcomes in order to achieve the new vision of YNOU, a newly-built open and distance university in the year of 2012. ＂Learning is ‘open＇ to everyone, study occurs by anyone, anytime, and anywhere＂ by making education accessible to all. Additionally, it is appealed for enhancing sustainable development of modern open and distance learning on the new research agenda. 相似文献
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It is difficult to analyze the inter-relationship for the construction layout of a reservoir project scientifically and intuitively.According to the characteristics of broad field and huge information,the modeling methods of digital terrain and solid model as well as the techniques of texture mapping and scene navigation are adopted.The simulation system is developed by C program language,which includes the functions of the interactive navigation of 3D scene,the visual inquiry of project digital model information,the storage and management of project information.A certain reservoir is taken as a case.The 3D visual analysis for the construction layout and engineering information are obtained.The proposed system is of great advantages in dealing with large amount of information and the method provides a theoretical basis and technical support for the construction layout of a reservoir project. 相似文献
6.
Rune J. Krumsvik 《美中教育评论》2008,5(9):1-16
This position paper highlights existing and emerging, prospective digital divides in Norwegian schools and asks whether we are now moving from traditional digital divides to digital inequality in our digitized society and schools. Despite very good technology density in Norwegian society and schools in general, there is the reason to pay attention to whether this situation creates new kinds of digital inequalities among already vulnerable pupil groups. Therefore, this position paper focuses on whether under the new Norwegian educational reform. The Knowledge Promotion, it is necessary to consider this issue from another angle because of e.g. the increased status of digital literacy and implementation of ICT-based （Information and Communication Technology） exams in the national curriculum. The position paper focuses on what kind of digital inequalities we see the profiles of and what issues the government has to consider to prevent these tendencies escalating. 相似文献
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INTRODUCTION The objective of the China-America Digital Academic Library Project (CADAL) is to provide universal access to one million digital books and multimedia resources for teaching and research, and explore the ways of applying multimedia and virtual reality technologies to digital library. Terabyte volume of multimedia data of various types of modality, such as text, image, video, anima- tion, are available in the CADAL, which is one of the distinct characteristic of CADAL. … 相似文献
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This book is greatly appreciated for its collection of various innovative activities which could be applied in different levels of technology-savvy classrooms.It is regarded as guidance to show paths for language educators to teach in digital age,although most of the teachers today are digital immigrants who "have become fascinated by and adopted many,or most aspects of the new technology are,and always will be compared to them"(Prensky,2001).They have to attempt to equip themselves with the knowledge of new media,which aims to provide the current students with their needs to become fully literate in this digital age.However,when the Internet began to arrive in schools,it was embraced by educators already seasoned in the challenges of change. 相似文献
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Rune Krumsvik 《美中教育评论》2008,5(7):13-28
This article highlights how the digital revolution, high technology density, digital confident students and the new educational reform necessitates other theoretical gateways in our contemporary school system. Today we find a consensus among policy-makers, researchers, teacher educators and teachers that competence aims and digital literacy must be given high priority and needs to be explored more deeply in our elementary school as a consequence of the implementation of a new national curriculum. Despite this consensus, ICT （information and Communication Technology） in previous curricula have been marked by weak theoretical foundations, and therefore implementation of ICT has been more strongly anchored rhetorically than in teacher＇s theoretical ballast. Consequently, this article focuses on whether we now in the new educational reform, the knowledge promotion, are entering a time of upheaval within this area where the increased status of digital literacy and competence aims in the subjects necessitates new, or complementary theories which can capture some of these digital challenges. The article focuses on the ＂paradigm debate＂ within education and specially one theory, situated learning, is presented and analysed in light of other theories, educational policy documents and contemporary societal streams, 相似文献
10.
It is inevitable that as a result of progress in technology and the changes in the ways with which design is conceived, interior architecture schools should be updated according to these requirements and that new educational processes should be tried out. It is for this reason that the scope and aim of this study have been determined as being the formulation of a hybrid educational model for the integration of digital approaches to design within the interior architecture education system. Within the chosen scope and aim of this study, and as a methodology, various algorithmic and parametric approaches have been applied in various practical applications as digital design instruments, and conclusions have been reached concerning the advantages they offer within the design process. The advantages and disadvantages, concerning interior architecture education, of digital approaches to design over the traditional design method, have been presented on the basis of results found during practical applications of digital design, the information found in publications about this subject. A hybrid educational model for the restructuring with digital design instruments of interior architecture education and design studios as experimental areas has been presented. Thanks to this proposed model, the establishment of a computer formatted analytic design system in the guise of dynamic systems will get easier and, the opportunity of restructuring the process and conception of design will also present itself. As the effects of this method are reflected on the products, new geometric approaches and typologies will appear, with the result that designs and digital instruments will constantly be developed and will evolve. In conclusion, educating the designers of the future according to the essence of these approaches will make it possible to train professionals who correctly use and understand the technologies being developed, who have a critical stance, and who can produce renewable designs. 相似文献
11.
介绍了无损数据隐藏技术的发展状况，按照其应用情况主要可分为脆弱型认证、大容量数据嵌入和半脆弱型认证3大类。讨论了每一种算法的优缺点，提出进一步的研究工作应集中在发展具有足够鲁棒性的无损数据隐藏技术，使其能在JPPEG2000压缩图像的半脆弱数字水印认证方面得到广泛的应用。 相似文献
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稳健图像Hash研究进展 总被引：3，自引：0，他引：3
The easy generation, storage, transmission and reproduction of digital images have caused serious abuse and security problems. Assurance of the rightful ownership, integrity, and authenticity is a major concern to the academia as well as the industry. On the other hand, efficient search of the huge amount of images has become a great challenge. Image hashing is a technique suitable for use in image authentication and content based image retrieval （CBIR）. In this article, we review some representative image hashing techniques proposed in the recent years, with emphases on how to meet the conflicting requirements of perceptual robustness and security. Following a brief introduction to some earlier methods, we focus on a typical two-stage structure and some geometric-distortion resilient techniques. We then introduce two image hashing approaches developed in our own research, and reveal security problems in some existing methods due to the absence of secret keys in certain stage of the image feature extraction, or availability of a large quantity of images, keys, or the hash function to the adversary. More research efforts are needed in developing truly robust and secure image hashing techniques. 相似文献
13.
主要介绍了一种典型的基于RS分组的无损数据嵌入算法,重点讨论了4个象素为一组的情况,根据象素分组时有无重叠,分别利用7副测试图像对算法进行了实验和仿真,通过比较2种情况下的嵌入容量,指出了象素重叠具有更好嵌入率的特点。根据试验结果,对Fridrich所提出的结论进行了分析和论证,最后,针对实验中出现的问题,特别指出了Fridrich算法中需要提高和完善的地方。 相似文献
14.
能抵抗RQP分析的密写技术 总被引：6，自引：0，他引：6
A new steganographic approach for 24-bit color images that can resist the RQP(raw-quick-pairs)steganalysis is described.The technique is based on modification of color triplets such that the existing color palette is not excessively expanded or even reduced.In this way,numbers of unique colors and pairs of close-colors in the image do not rise significantly.This invalidates the RQP analysis.Experimental results are presented to support the argument. 相似文献
15.
通过阐述信息隐藏的基本概念,比较了两种信息隐藏技术的特点,进而从信息隐藏的对立面分析了两种对抗技术——隐密分析和水印攻击,探讨了信息论等信息隐藏技术的研究方法,并介绍了信息隐藏在各领域中的应用。 相似文献
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介绍了数字水印技术的产生过程及其特点:透明性、鲁棒性和安全性,比较了数字水印与密码学的差别,数字水印通过在数字信息产品中嵌入不可见信息来标识其所有者.分析了数字水印技术的现状,主要有两大类水印嵌入方法:基于空间域和基于变换域.根据水印传输载体的不同对数字水印在版权保护方面的应用进行了分类,基于对数字水印的学习研究,对数字水印技术的发展进行了展望,数字水印的应用领域将会越来越大. 相似文献
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利用文[9]所提出的下截集、顺序集合套概念,首先给出了反fuzzy子群,反fuzzy正规子群的定义,并讨论了其定义的等价性,其次给出了fuzzy集左、右陪集的概念,讨论了左、右陪集相等的充要条件及其运算性质,最后给出了模糊商群的定义,得到了与文[7]类似的结果,用顺序集合套的观点解释文[7]所提出的反fuzzy子群的概念更直观易懂。 相似文献
20.
王争鸣 《襄樊职业技术学院学报》2012,(1):68-71
诗歌是一种喜闻乐见的文学形式。诗歌的创作主要依靠形象思维,而数字恰恰是单调乏味的,似乎与形象二字相距甚远。然而,在我国古典诗歌中,诗人们却将这些看似枯燥乏味的数字嵌入诗中,使之韵味无穷、情趣陡增。唐诗是我国古典诗歌艺术的最高峰,其创作技巧千姿百态,数字入诗便是其中之一。本文从创作方式和艺术效果两方面对唐诗以数字入诗的艺术技巧作一点浅陋的分析。 相似文献