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A new companion to digital humanities
\"A New Companion to Digital Humanities offers the most comprehensive and up-to-date collection of research currently available in this dynamic and burgeoning field\"--Provided by publisher.
Book
An open-access database and analysis tool for perovskite solar cells based on the FAIR data principles
Large datasets are now ubiquitous as technology enables higher-throughput experiments, but rarely can a research field truly benefit from the research data generated due to inconsistent formatting, undocumented storage or improper dissemination. Here we extract all the meaningful device data from peer-reviewed papers on metal-halide perovskite solar cells published so far and make them available in a database. We collect data from over 42,400 photovoltaic devices with up to 100 parameters per device. We then develop open-source and accessible procedures to analyse the data, providing examples of insights that can be gleaned from the analysis of a large dataset. The database, graphics and analysis tools are made available to the community and will continue to evolve as an open-source initiative. This approach of extensively capturing the progress of an entire field, including sorting, interactive exploration and graphical representation of the data, will be applicable to many fields in materials science, engineering and biosciences.
Making large datasets findable, accessible, interoperable and reusable could accelerate technology development. Now, Jacobsson et al. present an approach to build an open-access database and analysis tool for perovskite solar cells.
Journal Article
RGB image encryption using SPN with a novel block cipher over simple graph adjacency matrices and Galois fields
This paper presents a construction of a secure image encryption scheme with graph theory, Galois field, and substitution-permutation network (SPN) for enhanced multimedia data security. First of all, the authors begin by constructing a complete graph with 8 vertices to understand the structure of the graph
and then draw the adjacency matrix
of the graph
. An elementary finite field
by the use of the irreducible polynomial and give representation of the elements of
in a form of a binary. An affine mapping is defined using an adjacency matrix A whose entries lie in
; each entry is transformed by computing its multiplicative inverse in
and then augmented with a parameter from
. This mapping is used to construct
S-boxes, which together with other components constitute the nonlinear portion of the SPN structure. This encryption method is applied to RGB images with three transformations proposed as below. Substitution in replacement of all the pixel’s R, G, and B channel values works with the help of S-box, which is
. Permutation is done with the help of the second S-box (
) the function of permutation is to shift the position of pixels in order to support both diffusion and confusion. Lastly, the third S-box
is utilized for the purpose of the XOR operation on the permuted pixel values, adding one more layer of confusion to the transformation. Finally, red, green, and blue channels are used to generate an encrypted RGB image. Test results and evaluations of the proposed scheme reveal that the encrypted images achieve entropy values in the range of 7.9971–7.9994, which are very close to the ideal value of 8, and exhibit minimal pixel correlation (close to zero). Moreover, the images are resistant to differential image cryptanalysis and linear image cryptanalysis. This demonstrates that the proposed approach provides strong randomness and ensures the secure protection of multimedia information, which is of critical importance in today’s applications.
Journal Article
Enabling Fine Sample Rate Settings in DSOs with Time-Interleaved ADCs
The time-base used by digital storage oscilloscopes allows limited selections of the sample rate, namely constrained to a few integer submultiples of the maximum sample rate. This limitation offers the advantage of simplifying the data transfer from the analog-to-digital converter to the acquisition memory, and of assuring stability performances, expressed in terms of absolute jitter, that are independent of the chosen sample rate. On the counterpart, it prevents an optimal usage of the memory resources of the oscilloscope and compels to post processing operations in several applications. A time-base that allows selecting the sample rate with very fine frequency resolution, in particular as a rational submultiple of the maximum rate, is proposed. The proposal addresses the oscilloscopes with time-interleaved converters, that require a dedicated and multifaceted approach with respect to architectures where a single monolithic converter is in charge of signal digitization. The proposed time-base allows selecting with fine frequency resolution sample rate values up to 200 GHz and beyond, still assuring jitter performances independent of the sample rate selection.
Journal Article
Cloud computing and digital media : fundamentals, techniques, and applications
\"While some related books cover separate aspects of digital media and cloud computing, none integrate both of these areas together. Bridging the gap between digital media and cloud computing, this book brings together technologies for media/data communication, elastic media/data storage, security, authentication, cross-network media/data fusion, inter-device media interaction/reaction, data centers, platform as a service (PaaS), and software as a service (SaaS). The book also covers interesting applications involving digital media in the cloud. \"-- Provided by publisher.
Book
ASSERT: A Blockchain-Based Architectural Approach for Engineering Secure Self-Adaptive IoT Systems
Internet of Things (IoT) systems are complex systems that can manage mission-critical, costly operations or the collection, storage, and processing of sensitive data. Therefore, security represents a primary concern that should be considered when engineering IoT systems. Additionally, several challenges need to be addressed, including the following ones. IoT systems’ environments are dynamic and uncertain. For instance, IoT devices can be mobile or might run out of batteries, so they can become suddenly unavailable. To cope with such environments, IoT systems can be engineered as goal-driven and self-adaptive systems. A goal-driven IoT system is composed of a dynamic set of IoT devices and services that temporarily connect and cooperate to achieve a specific goal. Several approaches have been proposed to engineer goal-driven and self-adaptive IoT systems. However, none of the existing approaches enable goal-driven IoT systems to automatically detect security threats and autonomously adapt to mitigate them. Toward bridging these gaps, this paper proposes a distributed architectural Approach for engineering goal-driven IoT Systems that can autonomously SElf-adapt to secuRity Threats in their environments (ASSERT). ASSERT exploits techniques and adopts notions, such as agents, federated learning, feedback loops, and blockchain, for maintaining the systems’ security and enhancing the trustworthiness of the adaptations they perform. The results of the experiments that we conducted to validate the approach’s feasibility show that it performs and scales well when detecting security threats, performing autonomous security adaptations to mitigate the threats and enabling systems’ constituents to learn about security threats in their environments collaboratively.
Journal Article
The digital humanities : a primer for students and scholars
\"The Digital Humanities is a comprehensive introduction and practical guide to how humanists use the digital to conduct research, organize materials, analyze, and publish findings. It summarizes the turn toward the digital that is reinventing every aspect of the humanities among scholars, libraries, publishers, administrators, and the public. Beginning with some definitions and a brief historical survey of the humanities, the book examines how humanists work, what they study, and how humanists and their research have been impacted by the digital and how, in turn, they shape it. It surveys digital humanities tools and their functions, the digital humanists' environments, and the outcomes and reception of their work. The book pays particular attention to both theoretical underpinnings and practical considerations for embarking on digital humanities projects. It places the digital humanities firmly within the historical traditions of the humanities and in the contexts of current academic and scholarly life\"-- Provided by publisher.
Book
Energy Loss Savings Using Direct Current Distribution in a Residential Building with Solar Photovoltaic and Battery Storage
This work presents a comparison of alternating current (AC) and direct current (DC) distribution systems for a residential building equipped with solar photovoltaic (PV) generation and battery storage. Using measured PV and load data from a residential building in Sweden, the study evaluated the annual losses, PV utilization, and energy savings of the two topologies. The analysis considered the load-dependent efficiency characteristics of power electronic converters (PECs) and battery storage to account for variations in operating conditions. The results show that DC distribution, coupled with PV generation and battery storage, offered significant loss savings due to lower conversion losses than the AC case. Assuming fixed efficiency for conversion gave a 34% yearly loss discrepancy compared with the case of implementing load-dependent losses. The results also highlight the effect on annual system losses of adding PV and battery storage of varying sizes. A yearly loss reduction of 15.8% was achieved with DC operation for the studied residential building when adding PV and battery storage. Additionally, the analysis of daily and seasonal variations in performance revealed under what circumstances DC could outperform AC and how the magnitude of the savings could vary with time.
Journal Article