A reversible and secure patient information hiding system for IoT driven e-health

Internet of things (IoT) coupled with mobile cloud computing has made a paradigm shift in the service sector. IoT-assisted mobile cloud based e-healthcare services are making giant strides and are likely to change the conventional ways of healthcare service delivery. Though numerous approaches for preventing unauthorized access to information exchanged between a mobile phone and cloud platform do exist, but there is no security mechanism to prevent unauthorized access by the cloud administrators. With an aim to ensure security of client data such as Electronic Patient Records (EPR), we propose a novel high-capacity and reversible data hiding approach for securely embedding EPR within the medical images using Optimal Pixel Repetition (OPR). OPR converts every pixel of the input image to a 2 × 2 block to facilitate reversibility by ensuring all the pixels in a 2 × 2 block to have different values. Since a 2 × 2 block is comprised of 4-pixel elements, which could be arranged in sixteen possible ways; we generate a lookup table corresponding to sixteen possible positions of pixels. EPR hiding in each block is achieved by permuting the pixels of a block according to the four-bit word of secret data, resulting in a histogram invariant stego image. The histogram invariance improves the robustness of the proposed scheme to statistical attacks. A stego image is said to hide embedded data securely, when it provides better imperceptivity for an appreciably high payload. Thus, while using information embedding approach for securing client data on a mobile-cloud platform, high imperceptivity is a desirable feature. Experimental results show that average PSNR obtained is 42 dB for payload 1.25 bpp by our scheme, showing its effectiveness for preventing unauthorized access to client’s sensitive data.     

How repeated studying and testing affects multimedia learning: Evidence for adaptation to task demands

Two biases can occur in multimedia learning: overconfidence and over-reliance on text processing. The present research sought to identify these biases and to investigate whether they can be reduced, and hence learning fostered, when studying and testing are repeated. In 2 experiments (Exp.1: N = 79, Exp.2: N = 52), students learned either with text only or with text and pictures (multimedia) about how the toilet flush works, gave judgments-of-learning (JOLs), were tested on the learning contents; afterwards this study-test cycle was repeated. Results from both experiments revealed stronger overconfidence due to multimedia in both study-test cycles (JOLs higher than learning outcomes). Eye movement data showed a relative increase in attention on the picture versus text from cycle 1 to cycle 2; this relative increase in attention was related to better learning outcomes. Repeated studying and testing thus helped to reduce over-reliance on text processing in multimedia learning, fostering performance.     

应急指挥软交换多媒体调度通信解决方案

本文基于软交换多媒体调度通信应用情况,对将来升级成软交换调度技术进行了技术设想,并对此升级方案进行了分析。通过方案设想和技术分析,在调度交换网络全面升级为软交换调度技术后,除提供现有语音调度功能外,将提供视频、增强会议、数据等多种通信方式和应用,大大增强了调度业务的方便性和灵活性。     

高职英语听力多媒体课件的设计与实现

在计算机及网络硬件飞速发展的今天，信息技术教育的条件不断成熟。而CAI课件只有与建构主义相结合时，才能构造出符合学生心理的教学环境，调动学生学习的积极性，提高教学质量和教学水平。在建构主义学习理论的指导下，设计并实现高职英语听力多媒体CAI课件的开发。     

高职院校多媒体教学中的问题与对策

多媒体教学作为一种新的辅助教学方式正在被各高职院校推广,但当前各高职院校多媒体辅助教学存在着教师认识不足、淡化教学个性、缺乏师生互动交流及教师人格的影响力降低等问题。为此,应当加强教师对多媒体教学的研究,提高认识;精心设计课件,提高教学效果,注重教师的教学基本功训练,开发多媒体教学网络,加强师生之间的交流与沟通。     

浅谈提高多媒体在高职高专英语教学中的效果

在高职高专英语教学中运用多媒体技术,可以拓宽教师教学空间,丰富学生的语言实践活动。在调动学生学习的主动性和积极性,培养学生的创新能力,优化课堂教学,提高教学效率等方面体现出了许多优势。但是,在多媒体运用过程中,也发现了许多的问题。针对多媒体教学课件运用中存在的误区,对如何提高多媒体在高职高专英语教学中的效果在理论和实践上作一些探讨。     

基于SMIL的流媒体网络课件整合制作平台

广西广播电视大学自2000年开始利用全区电大远程网络开展现代远程开放教育。经过几年的发展和积累,现已建立相当规模的教学资源库,随着网络系统的逐步完善和电大教学视频资源库的全面升级,从单纯的教学视频点播过渡到结合多种媒体的流媒体课件点播。为此我们建立了整合制作平台,能批量、低成本、通用化地制作网络流媒体课件,把电大教学资源库建设提升到新的层次。     

构建体育技术课程多媒体CAI课件评价体系与标准的研究

采用文献资料、专家调查、数理统计等方法，制定体育技术课程多媒体CAI课件评价体系，包括：操作性、技术性、科学性和教学性4类一级评价指标以及20项二级评价指标，并制定体育技术课程多媒体CAI课件评价标准，实现多媒体课件量化评价。     

网络多媒体教学课件设计与应用初探

本文介绍了网络多媒体教学课件在现代教学领域中的特点及优势,提出设计制作网络多媒体教学课件应把握的基本原则,并对网络课件在实际应用中所出现的问题提出了自己的观点。