scholarly journals An overview on video forensics

2012 ◽  
Vol 1 ◽  
Author(s):  
Simone Milani ◽  
Marco Fontani ◽  
Paolo Bestagini ◽  
Mauro Barni ◽  
Alessandro Piva ◽  
...  
Keyword(s):  
Digital Tv ◽  
Video Data ◽  
Multimedia Content ◽  
Video Forensics ◽  
Research Issues ◽  
Open Research ◽  
Reconstructed Signal ◽  
Simple Processing ◽  
History Of ◽  
Processing Steps

The broad availability of tools for the acquisition and processing of multimedia signals has recently led to the concern that images and videos cannot be considered a trustworthy evidence, since they can be altered rather easily. This possibility raises the need to verify whether a multimedia content, which can be downloaded from the internet, acquired by a video surveillance system, or received by a digital TV broadcaster, is original or not. To cope with these issues, signal processing experts have been investigating effective video forensic strategies aimed at reconstructing the processing history of the video data under investigation and validating their origins. The key assumption of these techniques is that most alterations are not reversible and leave in the reconstructed signal some “footprints”, which can be analyzed in order to identify the previous processing steps. This paper presents an overview of the video forensic techniques that have been proposed in the literature, focusing on the acquisition, compression, and editing operations, trying to highlight strengths and weaknesses of each solution. It also provides a review of simple processing chains that combine different operations. Anti-forensic techniques are also considered to outline the current limitations and highlight the open research issues.

scholarly journals Managing DSRC and WAVE Standards Operations in a V2V Scenario

2010 ◽  
Vol 2010 ◽  
pp. 1-18 ◽  
Author(s):  
Yasser L. Morgan
Keyword(s):  
Lessons Learned ◽  
Wireless Access ◽  
Research Papers ◽  
Research Issues ◽  
Dedicated Short Range Communications ◽  
The Core ◽  
Open Research ◽  
History Of ◽  
Major Attention ◽  
Safety Applications

The Dedicated Short-Range Communications (DSRC) standards suite is based on multiple cooperating standards mainly developed by the IEEE. In particular, we focus this paper on the core design aspects of DSRC which is called Wireless Access in Vehicular Environment (WAVE). WAVE is highlighted in IEEE 1609.1/.2/.3/.4. The DSRC and WAVE standards have been the center of major attention in both research and industrial communities. In 2008, WAVE standard was the third best seller standards in the history of the IEEE. This attention reflects the potential of WAVE to facilitate much of the vehicular safety applications. In this paper we present a fairly detailed tutorial of the WAVE standards. We extend the paper by describing some of the lessons learned from particular design approaches. We direct the reader to the landmark research papers in relevant topics. We alert the reader about major open research issues that might lead to future contribution to the WAVE design.

scholarly journals Industrial Dust Explosions. A Brief Review

2021 ◽  
Vol 11 (4) ◽  
pp. 1669 ◽  
Author(s):  
Rolf K. Eckhoff ◽  
Gang Li
Keyword(s):  
Case History ◽  
Final Section ◽  
Dust Explosion ◽  
Research Issues ◽  
Industrial Dust ◽  
Dust Clouds ◽  
Factors Influencing ◽  
History Of ◽  
Dust Explosions ◽  
Hybrid Mixtures

This paper first addresses the question: what is a dust explosion? Afterwards, some specific issues are briefly reviewed: materials that can give dust explosions, factors influencing ignitability and explosibility of dust clouds, the combustion of dust clouds in air, ignition sources that can initiate dust explosions, primary and secondary dust explosions, dust flash fires, explosions of “hybrid mixtures”, and detonation of dust clouds. Subsequently, measures for dust explosion prevention and mitigation are reviewed. The next section presents the case history of an industrial dust explosion catastrophe in China in 2014. In the final section, a brief review is given of some current research issues that are related to the prevention and mitigation of dust explosions. There is a constant need for further research and development in all the areas elucidated in the paper.

A Survey on Network Methodologies for Real-Time Analytics of Massive IoT Data and Open Research Issues

2017 ◽  
Vol 19 (3) ◽  
pp. 1457-1477 ◽  
Author(s):  
Shikhar Verma ◽  
Yuichi Kawamoto ◽  
Zubair Md. Fadlullah ◽  
Hiroki Nishiyama ◽  
Nei Kato
Keyword(s):  
Real Time ◽  
Research Issues ◽  
Open Research

Data center network architecture in cloud computing: review, taxonomy, and open research issues

2014 ◽  
Vol 15 (9) ◽  
pp. 776-793 ◽  
Author(s):  
Han Qi ◽  
Muhammad Shiraz ◽  
Jie-yao Liu ◽  
Abdullah Gani ◽  
Zulkanain Abdul Rahman ◽  
...  
Keyword(s):  
Cloud Computing ◽  
Data Center ◽  
Network Architecture ◽  
Data Center Network ◽  
Research Issues ◽  
Open Research

Research Approaches in Computer-Supported Collaborative Learning

2013 ◽  
Vol 9 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Tharrenos Bratitsis ◽  
Stavros Demetriadis
Keyword(s):  
Collaborative Learning ◽  
Research Field ◽  
Computer Supported Collaborative Learning ◽  
Research Issues ◽  
Online Distance Education ◽  
Theoretical Perspectives ◽  
History Of ◽  
How People Learn ◽  
Online Distance ◽  
New Research

Computer Supported Collaborative Learning (CSCL) is concerned with how people learn when working and interacting in groups with the assistance of ICTs. The field involves collaboration, computer mediation, online – distance education which raises interesting theoretical considerations regarding the actual studying of learning within CSCL settings. Being a rather interdisciplinary research field in nature, it has a long history of controversy about its theory, methods, and definition. In this editorial, through a quick review of the literature the diversity of issues examined under the CSCL research field becomes obvious. Moreover, an attempt to categorize these research issues is made. In this vein, the four interesting contributions of this Special Issue, regarding theoretical perspectives and issues of research of the field, are introduced. They comply with the distinguished categories, but they open new research borders as well.

scholarly journals Devising a conceptual method for generating cryptocompression codograms of images without loss of information quality

2021 ◽  
Vol 4 (2(112)) ◽  
pp. 6-17
Author(s):  
Vladimir Barannik ◽  
Serhii Sidchenko ◽  
Dmitriy Barannik ◽  
Sergii Shulgin ◽  
Valeriy Barannik ◽  
...  
Keyword(s):  
Information Quality ◽  
Dynamic Range ◽  
Video Data ◽  
Service Component ◽  
Loss Of Information ◽  
Video Information ◽  
Information Components ◽  
Service Data ◽  
Processing Steps ◽  
Better Than

Along with the widespread use of digital images, an urgent scientific and applied issue arose regarding the need to reduce the volume of video information provided it is confidential and reliable. To resolve this issue, cryptocompression coding methods could be used. However, there is no method that summarizes all processing steps. This paper reports the development of a conceptual method for the cryptocompression coding of images on a differentiated basis without loss of information quality. It involves a three-stage technology for the generation of cryptocompression codograms. The first two cascades provide for the generation of code structures for information components while ensuring their confidentiality and key elements as a service component. On the third cascade of processing, it is proposed to manage the confidentiality of the service component. The code values for the information components of nondeterministic length are derived out on the basis of a non-deterministic number of elements of the source video data in a reduced dynamic range. The generation of service data is proposed to be organized in blocks of initial images with a dimension of 16×16 elements. The method ensures a decrease in the volume of source images during the generation of cryptocompression codograms, by 1.14–1.58 times (12–37 %), depending on the degree of their saturation. This is 12.7‒23.4 % better than TIFF technology and is 9.6‒17.9 % better than PNG technology. The volume of the service component of cryptocompression codograms is 1.563 % of the volume of the source video data or no more than 2.5 % of the total code stream. That reduces the amount of data for encryption by up to 40 times compared to TIFF and PNG technologies. The devised method does not introduce errors into the data in the coding process and refers to methods without loss of information quality.

scholarly journals Serviço de apoio a distância ao professor em sala de aula pela tv digital interativa

2004 ◽  
Vol 1 (2) ◽  
pp. 53
Author(s):  
Sergio Ferreira do Amaral ◽  
Luciana Ozello Baratti ◽  
Daniel Moutinho Bataca ◽  
João Henrique de Augustinis Franco ◽  
José Manuel Martin Rios ◽  
...  
Keyword(s):  
New Technologies ◽  
Low Cost ◽  
Geographic Area ◽  
College Of Education ◽  
Digital Tv ◽  
Multimedia Content ◽  
Multimedia Material ◽  
Search Tool ◽  
Practical Development ◽  
Interactive Digital Tv

Este é um artigo de um projeto em andamento desenvolvido em parceria com a Diretoria Técnica de Serviços do CPqD Telecom & IT Solutions e a Faculdade de Educação da UNICAMP, que objetiva estabelecer um serviço de apoio a distância aos professores em sala de aula em 03 Escolas da região de Barão Geraldo em Campinas/ SP , para utilizar a TV Digital Interativa como ferramenta de busca e desenvolvimento de conteúdo multimídia interativo nas práticas pedagógicas. Fundamentalmente esta ferramenta será de fácil uso por utilizar como terminal de escolha e exibição um televisor colocado nas salas de aula das escolas e controlado por controle remoto. O professor poderá interagir com o conteúdo exibido no televisor de modo a obter uma programação não linear que se desenvolverá conforme o seu projeto pedagógico. As principais características do serviço são a facilidade de uso, fornecimento a distância de material multimídia interativo, baixo custo de implantação e grande área geográfica de cobertura, proporcionada pela disponibilidade quase total de sinal de televisão no território nacional. Este serviço é parte de um conjunto de serviços de teleducação que estão sendo desenvolvidos para o futuro Sistema de TV Digital terrestre que será implantado no Brasil. Palavras-chave: Educação a distância; TV digital interativa; Novas tecnologias aplicadas na educação; Tecnologia da informação e comunicação Abstract This is an article of a developed in progress project in would seem the Direction Technique of Services of the CPqD Telecom & IT Solutions and the College of Education of the UNICAMP, that objective in the distance to establish a support services to the teacher in classroom in 03 Schools of the region of Barão Geraldo in Campinas, SP, to use the Interactive Digital TV as a search tool and practical development of interactive multimedia content in the pedagogical practical ones. Basically this tool will be easy to use as a terminal of choice and exhibition a television set placed in the school’s classrooms and controlled for remote control. The teacher be able to interact with according to the content shown in the television set in order to get a non linear programme that will develop this pedagogical project. The main services characteristics are the easiness of use, supply of the interactive at distance multimedia material, low cost of implantation and covering of a great geographic area, for the almost total availability of signal of television in domestic territory. This service is part of a set of TV-education services that are being developed for the coming System of terrestrial Digital TV that will be implanted in Brazil. Key words: Distance Education; Interactive Digital TV; New Technologies applied in Education

Different Approaches to Economic and Social Changes: New Research Issues, Sources and Results

2022 ◽  
Keyword(s):  
Social History ◽  
Working Group ◽  
Hungarian Academy ◽  
Research Network ◽  
Research Issues ◽  
History Of ◽  
Regional Committee ◽  
New Research ◽  
High Level ◽  
Academy Of Sciences

This series was launched in 2021 by the Working Group of Economic and Social History of the Pécs Regional Committee of the Hungarian Academy of Sciences to present research conducted within its framework. The foreign language edition is meant to be a contribution to the internationalization of research made in Hungary. The Working Group has made every effort since the publication of the first two volumes to allow its members, and also their Ph.D. students, to publish their findings more easily and in larger volume, providing at the same time an opportunity for other professionals in the region of South Transdanubia to publish their researches. The majority of the studies in this book, similarly to the first volume of the series, are about the history of the region, but some of the papers go beyond this theme. The diversity of the papers created an inspiring environment for the authors, which in turn has greatly stimulated the already existing professional cooperation among them. Both the editors and the authors find it very important to popularise the economic and social history of the region as broadly as possible, in line with the ambitions of the Pécs Regional Committee of the Hungarian Academy of Sciences. In addition, this book also promotes the cooperation among generations of researchers; it is not only the young that enjoy the support of their senior colleagues but the ideas and momentum of the younger generation also keep the activity of the Working Group at a high level. It is due to the well-functioning generational discussions, among other things, that several young researchers earned their Ph.D. degree in 2021. The framework of the studies in the broader sense is the economic and social history of Hungary and Europe in the 18th – 20th centuries. The papers in this volume also provide information about the development and current phases of the different pieces of research. Several papers are sequels to publications released in 2021 from a chronological or thematic aspect, however the book contains brand new topics as well. Great significance is attributed to the fact that several renowned international members of the research network of the Working Group were also persuaded to publish. The results of some ongoing Ph.D. research are also presented. The high number of young authors is a proof that the professional interest in economic and social history is not decreasing at all. We do hope that this book will contribute to the maintenance of this trend.

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