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Topic Review
Reduction (Recursion Theory)
In computability theory, many reducibility relations (also called reductions, reducibilities, and notions of reducibility) are studied. They are motivated by the question: given sets A and B of natural numbers, is it possible to effectively convert a method for deciding membership in B into a method for deciding membership in A? If the answer to this question is affirmative then A is said to be reducible to B. The study of reducibility notions is motivated by the study of decision problems. For many notions of reducibility, if any noncomputable set is reducible to a set A then A must also be noncomputable. This gives a powerful technique for proving that many sets are noncomputable.
  • 547
  • 26 Oct 2022
Topic Review
Hidden Surface Determination
In 3D computer graphics, shown surface determination (also known as hidden surface removal (HSR), occlusion culling (OC) or visible surface determination (VSD)) is the process used to determine which surfaces and parts of surfaces are not visible from a certain viewpoint. A hidden surface determination algorithm is a solution to the visibility problem, which was one of the first major problems in the field of 3D computer graphics. The process of hidden surface determination is sometimes called hiding, and such an algorithm is sometimes called a hider. The analogue for line rendering is hidden line removal. Hidden surface determination is necessary to render an image correctly, so that one may not view features hidden behind the model itself, allowing only the naturally viewable portion of the graphic to be visible.
  • 958
  • 26 Oct 2022
Topic Review
IBM Mainframe Utility Programs
IBM mainframe utility programs are utility software supplied with IBM mainframe operating systems such as MVS and zOS to carry out various tasks associated with maintenance of the computer system or datasets. The following list describes utilities distributed with OS/360 and successors. No VSE or VM utilities are included.
  • 3.4K
  • 26 Oct 2022
Topic Review
Unique Games Conjecture
In computational complexity theory, the unique games conjecture (often referred to as UGC) is a conjecture made by Subhash Khot in 2002. The conjecture postulates that the problem of determining the approximate value of a certain type of game, known as a unique game, has NP-hard computational complexity. It has broad applications in the theory of hardness of approximation. If the unique games conjecture is true and P ≠ NP, then for many important problems it is not only impossible to get an exact solution in polynomial time (as postulated by the P versus NP problem), but also impossible to get a good polynomial-time approximation. The problems for which such an inapproximability result would hold include constraint satisfaction problems, which crop up in a wide variety of disciplines. The conjecture is unusual in that the academic world seems about evenly divided on whether it is true or not.
  • 1.0K
  • 26 Oct 2022
Topic Review
Libraries in Second Life
Second Life (SL) is an immersive 3D environment that can be used for entertainment and educational purposes. Due to increasing interest in digital services, some libraries have established virtual services on Second Life.
  • 321
  • 26 Oct 2022
Topic Review
NewsRx
NewsRx is a media and technology company focusing on digital media, printed media, news services, and knowledge discovery through its BUTTER platform. In 1995 the company was the world's largest producer of health news. The company publishes 194 newsweeklies in health and other fields, which are distributed to subscribers and partners including Factiva, the Wall Street Journal Professional Edition, Thomson Reuters, ProQuest, and Cengage Learning. C W Henderson founded the company in 1984 and its first publication was AIDS Weekly. In the early 2000s, the firm added the imprint, VerticalNews to publish newsweeklies in non-health fields. Now based in Atlanta, Georgia, the company reports through its daily news service and publishes reference books through its partner, ScholarlyEditions. NewsRx launched its BUTTER platform in 2015, which is a knowledge discovery engine that delivers its content to academics, researchers, and professionals.
  • 505
  • 26 Oct 2022
Topic Review
Fictional Actuaries
Fictional actuaries and the appearance of actuaries in works of fiction have been the subject of a number of articles in actuarial journals.
  • 503
  • 26 Oct 2022
Topic Review
Jspx-bay
jspx-bay, commonly referred to as jspx, is a free open source pure Java web RAD framework. Jspx should not be confused with other technologies using the same name like Oracle Application Framework and XML JSP. Jspx extends Java EE servlets to provide an Object-oriented programming model for HTML declarative code. Jspx can be compared to JSF as a web framework. There are many other Java Web frameworks like Apache Wicket that implement such ideas.
  • 818
  • 26 Oct 2022
Topic Review
WebP
WebP is an image file format developed by Google intended as a replacement for JPEG, PNG, and GIF file formats. It supports both lossy and lossless compression, as well as animation and alpha transparency. Google announced the WebP format in September 2010, and released the first stable version of its supporting library in April 2018.
  • 2.0K
  • 26 Oct 2022
Topic Review
Comparison of JavaScript Frameworks
There are many JavaScript frameworks available. The intention of this comparison is to show some examples of notable JavaScript frameworks.
  • 1.0K
  • 26 Oct 2022
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