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Topic Review
Petya and NotPetya
Petya is a family of encrypting malware that was first discovered in 2016. The malware targets Microsoft Windows–based systems, infecting the master boot record to execute a payload that encrypts a hard drive's file system table and prevents Windows from booting. It subsequently demands that the user make a payment in Bitcoin in order to regain access to the system. Variants of Petya were first seen in March 2016, which propagated via infected e-mail attachments. In June 2017, a new variant of Petya was used for a global cyberattack, primarily targeting Ukraine . The new variant propagates via the EternalBlue exploit, which is generally believed to have been developed by the United States . National Security Agency (NSA), and was used earlier in the year by the WannaCry ransomware. Kaspersky Lab referred to this new version as NotPetya to distinguish it from the 2016 variants, due to these differences in operation. In addition, although it purports to be ransomware, this variant was modified so that it is unable to actually revert its own changes. The NotPetya attacks have been blamed on the Russian government, specifically the Sandworm hacking group within the GRU Russian military intelligence organization, by security researchers, Google, and several governments.
  • 2.0K
  • 19 Oct 2022
Topic Review
Quality Assurance Agency for Higher Education
The Quality Assurance Agency for Higher Education (QAA) is the independent body that checks on standards and quality in UK higher education. It conducts quality assessment reviews, develops reference points and guidance for providers, and conducts or commissions research on relevant issues. QAA checks how universities, colleges and alternative providers of UK higher education maintain their academic standards and quality. It does this through external peer review. Reviewers check that the 19 expectations of the Quality Code, agreed and recognised by the UK higher education sector, are met. It also provides advice to the Privy Council of the United Kingdom, on institutions' requests for degree awarding powers and the right to be called a university. In addition to its role in sustaining the reputation of UK higher education, QAA also regulates the Access to Higher Education Diploma, a qualification that enables individuals without A Levels or the usual equivalent to enter higher education. QAA works closely with other organisations that have an interest in the reputation of UK higher education, including the Higher Education Academy, Universities UK and GuildHE.
  • 528
  • 19 Oct 2022
Topic Review
Loco2
Loco2, now rebranded as Rail Europe, is an online booking service for train travel in the United Kingdom and Europe. It sells tickets through its website and via its smartphone app which is available on iOS and Android platforms. It was founded in 2006 by brother and sister Jamie and Kate Andrews, and started trading in 2012 from its headquarters in London. Loco2 website and apps were rebranded Rail Europe in November 2019.
  • 554
  • 19 Oct 2022
Topic Review
Machine Learning Algorithms in Manufacturing
The quality-control process in manufacturing must ensure the product is free of defects and performs according to the customer’s expectations. Maintaining the quality of a firm’s products at the highest level is very important for keeping an edge over the competition. To maintain and enhance the quality of their products, manufacturers invest a lot of resources in quality control and quality assurance. During the assembly line, parts will arrive at a constant interval for assembly. The quality criteria must first be met before the parts are sent to the assembly line where the parts and subparts are assembled to get the final product. Once the product has been assembled, it is again inspected and tested before it is delivered to the customer. Because manufacturers are mostly focused on visual quality inspection, there can be bottlenecks before and after assembly. The manufacturer may suffer a loss if the assembly line is slowed down by this bottleneck. To improve quality, state-of-the-art sensors are being used to replace visual inspections and machine learning is used to help determine which part will fail.
  • 1.0K
  • 19 Oct 2022
Topic Review
Lists of Mathematics Topics
This article itemizes the various lists of mathematics topics. Some of these lists link to hundreds of articles; some link only to a few. The template to the right includes links to alphabetical lists of all mathematical articles. This article brings together the same content organized in a manner better suited for browsing. The purpose of this list is not similar to that of the Mathematics Subject Classification formulated by the American Mathematical Society. Many mathematics journals ask authors of research papers and expository articles to list subject codes from the Mathematics Subject Classification in their papers. The subject codes so listed are used by the two major reviewing databases, Mathematical Reviews and Zentralblatt MATH. This list has some items that would not fit in such a classification, such as list of exponential topics and list of factorial and binomial topics, which may surprise the reader with the diversity of their coverage.
  • 2.9K
  • 19 Oct 2022
Topic Review
Object-Relational Impedance Mismatch
The object-relational impedance mismatch is a set of conceptual and technical difficulties that are often encountered when a relational database management system (RDBMS) is being served by an application program (or multiple application programs) written in an object-oriented programming language or style, particularly because objects or class definitions must be mapped to database tables defined by a relational schema. The term object-relational impedance mismatch is derived from the electrical engineering term impedance matching.
  • 313
  • 19 Oct 2022
Topic Review
Clipboard (Computing)
The clipboard is a buffer that some operating systems provide for short-term storage and transfer within and between application programs. The clipboard is usually temporary and unnamed, and its contents reside in the computer's RAM. The clipboard provides an application programming interface by which programs can specify cut, copy and paste operations. It is left to the program to define methods for the user to command these operations, which may include keybindings and menu selections. When an element is copied or cut, the clipboard must store enough information to enable a sensible result no matter where the element is pasted. Application programs may extend the clipboard functions that the operating system provides. A clipboard manager may give the user additional control over the clipboard. Specific clipboard semantics vary among operating systems, can also vary between versions of the same system, and can sometimes be changed by programs and by user preferences. Windows, Linux and macOS support a single clipboard transaction.
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  • 19 Oct 2022
Topic Review
Web Automated Human Interaction
Web Automated Human Interaction (Wahi) is a technology from Wahi Media, Inc. for simulating two-way conversation on the web. Conversations branch, based on the user's responses, and information about the audience is collected and reported in real time, allowing the wahi designer to hear and understand how viewers respond to the message.
  • 376
  • 19 Oct 2022
Topic Review
Nine-Point Circle
In geometry, the nine-point circle is a circle that can be constructed for any given triangle. It is so named because it passes through nine significant concyclic points defined from the triangle. These nine points are: The nine-point circle is also known as Feuerbach's circle, Euler's circle, Terquem's circle, the six-points circle, the twelve-points circle, the n-point circle, the medioscribed circle, the mid circle or the circum-midcircle. Its center is the nine-point center of the triangle.
  • 938
  • 19 Oct 2022
Topic Review
Orthodiagonal Quadrilateral
In Euclidean geometry, an orthodiagonal quadrilateral is a quadrilateral in which the diagonals cross at right angles. In other words, it is a four-sided figure in which the line segments between non-adjacent vertices are orthogonal (perpendicular) to each other.
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  • 19 Oct 2022
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