scholarly journals Antitamper Image Watermarking Based on Cellular Network Topology for IoT-Themed Mobile Forensics

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Xiao-zhu Xie ◽  
Ching-Chun Chang ◽  
Zhong-Liang Yang ◽  
Li Li
Keyword(s):  
Mobile Devices ◽  
Network Topology ◽  
Mobile Communications ◽  
Cellular Network ◽  
Image Watermarking ◽  
Computational Cost ◽  
Lookup Table ◽  
Mobile Forensics ◽  
Interdisciplinary Field ◽  
Reference Matrix

The Internet of Things (IoT) connects physical and digital worlds with mobile devices, accompanied by a surge in cybersecurity issues. With the rapid adoption of mobile devices, mobile forensics emerges as a new interdisciplinary field that concerns many forms of sabotage and cybercrime in the context of mobile computing. One of the most common cyberattacks is tampering. Digital watermarking is a tamper-evident technique used to protect data integrity. In this paper, we present an antitamper image watermarking scheme designed for mobile communications with low computational cost. A reference matrix based on cellular network topology is introduced to guide the watermark embedding and extraction processes. This reference matrix serves as a lookup table to reduce computational complexity, thereby enabling efficient implementation on mobile devices. Our scheme is aimed at offering high accuracy in detecting and localizing tampered regions. We also achieve a high watermarking capacity while leaving the visual quality of the carrier images nearly unharmed. Experimental results validate the effectiveness of our scheme against various types of simulated forgery including cropping and copy/paste attacks.

Multimedia for Mobile Devices

2008 ◽  
pp. 590-598
Author(s):  
Kevin Curran
Keyword(s):  
Wireless Communication ◽  
Everyday Life ◽  
Mobile Devices ◽  
Mobile Phones ◽  
Network Topology ◽  
Mobile Communications ◽  
New Technologies ◽  
Video On Demand ◽  
On Demand ◽  
High Bandwidth

Mobile communications is a continually growing sector in industry and a wide variety of visual services such as video-on-demand have been created which are limited by low-bandwidth network infrastructures. The distinction between mobile phones and personal device assistants (PDA’s) has already become blurred with pervasive computing being the term coined to describe the tendency to integrate computing and communication into everyday life. New technologies for connecting devices like wireless communication and high bandwidth networks make the network connections even more heterogeneous. Additionally, the network topology is no longer static, due to the increasing mobility of users. Ubiquitous computing is a term often associated with this type of networking.

Multimedia for Mobile Devices

2008 ◽  
pp. 323-330
Author(s):  
Kevin Curran
Keyword(s):  
Wireless Communication ◽  
Everyday Life ◽  
Mobile Devices ◽  
Mobile Phones ◽  
Network Topology ◽  
Mobile Communications ◽  
New Technologies ◽  
Video On Demand ◽  
On Demand ◽  
High Bandwidth

Mobile communications is a continually growing sector in industry and a wide variety of visual services such as video-on-demand have been created which are limited by low-bandwidth network infrastructures. The distinction between mobile phones and personal device assistants (PDA’s) has already become blurred with pervasive computing being the term coined to describe the tendency to integrate computing and communication into everyday life. New technologies for connecting devices like wireless communication and high bandwidth networks make the network connections even more heterogeneous. Additionally, the network topology is no longer static, due to the increasing mobility of users. Ubiquitous computing is a term often associated with this type of networking.

scholarly journals A Fusion Method for Combining Low-Cost IMU/Magnetometer Outputs for Use in Applications on Mobile Devices

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2616 ◽  
Author(s):  
Photis Patonis ◽  
Petros Patias ◽  
Ilias N. Tziavos ◽  
Dimitrios Rossikopoulos ◽  
Konstantinos G. Margaritis
Keyword(s):  
Mobile Devices ◽  
Low Cost ◽  
Mathematical Formulation ◽  
Computational Cost ◽  
Three Dimensional ◽  
Fusion Method ◽  
Augmented Reality Application ◽  
Measurement Units ◽  
Gimbal Lock ◽  
Software Utility

This paper presents a fusion method for combining outputs acquired by low-cost inertial measurement units and electronic magnetic compasses. Specifically, measurements of inertial accelerometer and gyroscope sensors are combined with no-inertial magnetometer sensor measurements to provide the optimal three-dimensional (3D) orientation of the sensors’ axis systems in real time. The method combines Euler–Cardan angles and rotation matrix for attitude and heading representation estimation and deals with the “gimbal lock” problem. The mathematical formulation of the method is based on Kalman filter and takes into account the computational cost required for operation on mobile devices as well as the characteristics of the low-cost microelectromechanical sensors. The method was implemented, debugged, and evaluated in a desktop software utility by using a low-cost sensor system, and it was tested in an augmented reality application on an Android mobile device, while its efficiency was evaluated experimentally.

scholarly journals Pairwise interaction processes for modeling cellular network topology

2012 ◽  
Author(s):  
David B. Taylor ◽  
Harpreet S. Dhillon ◽  
Thomas D. Novlan ◽  
Jeffrey G. Andrews
Keyword(s):  
Network Topology ◽  
Cellular Network ◽  
Pairwise Interaction ◽  
Interaction Processes

scholarly journals APLIKASI MOBILE PORTAL BERITA GANTO.OR.ID BERBASIS ANDROID

2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Afrinaldi Afrinaldi ◽  
Asrul Huda ◽  
Denny Kurniadi
Keyword(s):  
Web Service ◽  
Mobile Devices ◽  
Data Storage ◽  
Programming Language ◽  
Mobile Device ◽  
Mobile Communications ◽  
Mobile Application ◽  
High Mobility ◽  
Communication Tool ◽  
Application Development

The development of mobile communication technology leads people to use technology not only as a communication tool, but also as a tool to find a variety of information, and news. Today's society considers mobile communications media as a very practical needs in its use and has high mobility. Many news portal now also includes news portal applications for mobile devices. Ganto UNP news portal does not provide the application which led to the news portal infrequently accessed through mobile devices because of the view that is not user-friendly when accessed through the device. To overcome this problem, it is necessary to design a mobile application for Ganto news portal. So that mobile device users no longer need to access the Ganto news portal through a web browser. Simply by using the mobile application. This application was designed with the Java programming language, Eclipse as an IDE, Eclipse ADT as a plugin on android, and the Android SDK for Android application development, as well as the AVD emulator to run the android system. Programming language used to build web-service is PHP programming language and MySQL DBMS that has owned news portals Ganto as data storage server. By utilizing the Android mobile device technology, successfully obtained an application that can accommodate the needs of people who have a high level of mobility to access information on Ganto news portals anytime and anywhere effectively and efficiently.  Keywords   : News Portal, Ganto, Android, web-service.

scholarly journals FAST IMPLEMENTATION OF DIGITAL WATERMARKING SCHEMES BASED ON ARNOLD AND DISCRETE WAVELET TRANSFORMS

2021 ◽  
Vol XLIV-2/W1-2021 ◽  
pp. 213-219
Author(s):  
A. G. Zotin ◽  
A. V. Proskurin
Keyword(s):  
Digital Watermarking ◽  
Wavelet Transforms ◽  
Computational Cost ◽  
Multimedia Data ◽  
Lookup Table ◽  
Discrete Wavelet ◽  
Discrete Wavelet Transforms ◽  
Secret Key ◽  
Linear Sequence ◽  
Speed Up

Abstract. In recent years, digital watermarking of photo and video materials has become more and more important in connection with the transmission of multimedia data over unsecured communication channels. Digital watermarking allows to reduce the amount of transmitted information and to protect embedded metadata. Improving robustness and security of embedded data increases computational costs, which obstruct usage of digital watermarks in mobile devices. In this research, we propose a number of improvements to the digital watermarking process based on Arnold and discrete wavelet transforms to reduce the computational cost. Considering the watermark as a linear sequence of pixels allows us to speed up its processing. The two-dimensional lookup table allows performing an Arnold transform in constant time regardless of the number of iterations. Number of iteration for each block of watermark is determined using hash function applied to the secret key. Also, the structure of the lookup table is proposed to accelerate the embedding of watermark. This table allows to determine the frequency coefficients for embedding based on the key hash code. Proposed improvements allow to speed up the watermark preparation by an average 14 times and the overall embedding process by 1.22 times for 1920×1080 images.

scholarly journals ANALYSIS OF THE PROCESS OF CREATION AND USE OF MOBILE APPLICATIONS

2020 ◽  
Vol 70 (2) ◽  
pp. 223-228
Author(s):  
R.K. Zhirenbaeva ◽  
◽  
M. Raev ◽  
B.Zh. Kirgizbaeva ◽  
◽  
...  
Keyword(s):  
Mobile Devices ◽  
Mobile Communications ◽  
Mobile Applications ◽  
Information Technologies ◽  
Information Space ◽  
Amount Of Information ◽  
Short Period ◽  
The World ◽  
Short Time

At the present time, thanks to the fact that the world works in the information space with a large amount of information, it has become one of the most important measures for that, in a short time, for a short period of time. Therefore, for informing the world, only one computer connection became insufficient, it is very important to expand the connection through mobile devices, to use and develop mobile applications. Necessary information technologies for the integration of mobile communications are actively developing. This article discusses the widespread use of mobile applications for the development of mobile communications and their classification by structure and composition. Consider the features

scholarly journals Applying Robots as Teaching Assistant in EFL Classes at Iranian Middle-Schools

2021 ◽  
Vol 15 ◽  
pp. 165-171
Author(s):  
A. Meghdari ◽  
M. Alemi ◽  
M. Ghaazisaidi ◽  
A. R. Taheri ◽  
A. Karimian ◽  
...  
Keyword(s):  
Language Learning ◽  
Mobile Devices ◽  
Nonverbal Communication ◽  
Social Relations ◽  
Teaching And Learning ◽  
Language Teaching ◽  
Service Robots ◽  
Computer Assisted ◽  
Interdisciplinary Field ◽  
Language Teaching And Learning

Since its invention, robots have been developed for various purposes and needs, quite similar to personal computers in their early days. However, with the advancement of technology, it is anticipated that in near future one of the cutting-edge technologies to be used in “language teaching and learning” is robotics. Humanoid and/or animal shaped robots will soon gain more attention as a fancy tool for 1st and 2nd language teaching in mid-schools/high schools around the globe. At CEDRA, we are currently exploring the design and application of educational service robots to initiate and pioneer Robotics Assisted Language Learning (RALL) in Iranian schools. With the proliferation of computers and mobile devices, Computer Assisted Language Learning (CALL) and Mobile Assisted Language Learning (MALL) have been in the limelight for 2nd language instructional theories for about a decade or more. However, utilizing robots to support language teaching and learning can certainly enhance today's conventional techniques. Robots not only have the features and interfaces already being employed in CALL/MALL, but are also capable of autonomous movements, visual/voice recognition, and physical/ environmental interactions when equipped with various sensors. Although computers or mobile devices also can be capable of nonverbal communication employing cyber characters/videos, robots are notable in their capacity for nonverbal communication, such as facial expressions, gestures and actions, while coexisting with users in a real environment such as the home/classroom. Additionally, robots are different from computers and mobile devices in a way that they have a friendly appearance and are successfully capable of keeping social relations. This article covers an overview of the subject and our current activities/findings in the interdisciplinary field of RALL in the English as a Foreign Language (EFL) classes and as a case study in the broader filed of Social Robotics in Iran

scholarly journals Global Systems Performance Analysis for Mobile Communications (GSM) using Cellular Network CODECS

2021 ◽  
Author(s):  
Maphuthego Etu Maditsi ◽  
Thulani Phakathi ◽  
Francis Lugayizi ◽  
Michael Esiefarienrhe
Keyword(s):  
Mobile Communications ◽  
Cellular Network ◽  
Network Performance ◽  
Network Services ◽  
Technology Changes ◽  
Gsm Network ◽  
Modulation Methods ◽  
Global Systems ◽  
Near Future

Global System for Mobile Communications (GSM) is a cellular network that is popular and has been growing in recent years. It was developed to solve fragmentation issues of the first cellular system, and it addresses digital modulation methods, level of the network structure, and services. It is fundamental for organizations to become learning organizations to keep up with the technology changes for network services to be at a competitive level. A simulation analysisusing the NetSim tool in this paper is presented for comparing different cellular network codecsfor GSM network performance. Theseparameters such as throughput, delay, and jitter are analyzed for the quality of service provided by each network codec. Unicast application for the cellular network is modeled for different network scenarios. Depending on the evaluation and simulation, it was discovered that G.711, GSM_FR, and GSM-EFR performed better than the other codecs, and they are considered to be the best codecs for cellular networks.These codecs will be of best use to better the performance of the network in the near future.

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