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Topic Review
FO (Complexity)
In descriptive complexity, a branch of computational complexity, FO is a complexity class of structures that can be recognized by formulas of first-order logic, and also equals the complexity class AC0. Descriptive complexity uses the formalism of logic, but does not use several key notions associated with logic such as proof theory or axiomatization. Restricting predicates to be from a set X yields a smaller class FO[X]. For instance, FO[Similarly, extensions of first-order logic formed by the addition of operators give rise to other well-known complexity classes. This allows the complexity of some problems to be established without reference to algorithms.
  • 376
  • 03 Nov 2022
Topic Review
ITunes LP
iTunes LP (referred to in pre-launch press by the code name Cocktail) is a format for interactive album artwork introduced by Apple Inc. on September 9, 2009. It is similar to the CMX format being developed by the three major record labels, and operates within the iTunes 9 to iTunes 12 software, allowing the user to view multimedia elements alongside the music. This format is also used to bundle extra content (known as iTunes Extras) with selected movies at the iTunes Store. iTunes LP downloads use a proprietary file format with the extension .itlp, which is essentially a WebArchive adhering to special conventions using HTML, CSS, JavaScript, CSS Animations, and plists. This technology is referred to in iTunes LP files as TuneKit. On November 28, 2009, the iTunes LP SDK was released to the public. In 2011, MTV introduced the O Music Awards, intended artists, fans, and innovators at this online awards show. One of the OMAs' inaugural categories was Best iTunes LP. The winner of this category was Pink's Greatest Hits...So Far!!! (Deluxe Edition). Apple stopped accepting new submissions of iTunes LPs after March 2018. Existing LPs will be deprecated from the store during the remainder of 2018. Customers who have previously purchased an album containing an iTunes LP will still be able to download the additional content using iTunes Match.
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Topic Review
Root Name Server
A root name server is a name server for the root zone of the Domain Name System (DNS) of the Internet. It directly answers requests for records in the root zone and answers other requests by returning a list of the authoritative name servers for the appropriate top-level domain (TLD). The root name servers are a critical part of the Internet infrastructure because they are the first step in translating (resolving) human readable host names into IP addresses that are used in communication between Internet hosts. A combination of limits in the DNS and certain protocols, namely the practical size of unfragmented User Datagram Protocol (UDP) packets, resulted in a decision to limit the number of root servers to thirteen server addresses. The use of anycast addressing permits the actual number of root server instances to be much larger, and is 1,086 (As of July 2020).
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  • 03 Nov 2022
Topic Review
3DNow!
3DNow! is a deprecated extension to the x86 instruction set developed by Advanced Micro Devices (AMD). It adds single instruction multiple data (SIMD) instructions to the base x86 instruction set, enabling it to perform vector processing of floating-point vector-operations using Vector registers, which improves the performance of many graphic-intensive applications. The first microprocessor to implement 3DNow was the AMD K6-2, which was introduced in 1998. When the application was appropriate, this raised the speed by about 2–4 times. However, the instruction set never gained much popularity, and AMD announced on August 2010 that support for 3DNow would be dropped in future AMD processors, except for two instructions (the PREFETCH and PREFETCHW instructions). The two instructions are also available in Bay-Trail Intel processors.
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Topic Review
Evidence-based Subjective Logic
Evidence-based subjective logic (EBSL) is a variant of subjective logic in which the transitivity of opinions (discounting) is handled by applying weights to the evidence underlying the opinions. Subjective logic is based on Dempster–Shafer belief theory. The discounting rule in EBSL makes it possible to handle arbitrary trust networks.
  • 407
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Topic Review
Avalanche (Consensus Protocol)
Avalanche is a protocol for solving consensus in a network of unreliable machines, where failures may be crash-fault or Byzantine. The protocol was anonymously introduced on IPFS on May 2018 and was formalized in more detail by Cornell University researchers in 2019. The protocol has four basic interrelated mechanisms that compose structural support of the consensus tool. These four mechanisms are Slush, Snowflake, Snowball, and Avalanche. By using uses randomized sampling and metastability to ascertain and persist transactions, It represents a new protocol family. Although the original paper focused on a single protocol, namely Avalanche, it implicitly introduced a broad spectrum of voting-based, or quorum-based consensus protocols, called the Snow family. While Avalanche is a single instantiation, the Snow family seems to be able to generalize all quorum-based voting protocols for replica control. Unlike prior quorum-based work, the Snow family enables arbitrarily parametrizable failure probability at the quorum intersection level. Standard quorum-based protocols define this failure probability to be precisely zero, but by introducing errors in the quorum intersection, a larger set of consensus protocol design is available.
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  • 03 Nov 2022
Topic Review
Optical Fiber Sensors and Sensing Networks
Optical fiber sensors present several advantages in relation to other types of sensors. These advantages are essentially related to the optical fiber properties, i.e., small, lightweight, resistant to high temperatures and pressure, electromagnetically passive, among others. Sensing is achieved by exploring the properties of light to obtain measurements of parameters, such as temperature, strain, or angular velocity. In addition, optical fiber sensors can be used to form an Optical Fiber Sensing Network (OFSN) allowing manufacturers to create versatile monitoring solutions with several applications, e.g., periodic monitoring along extensive distances (kilometers), in extreme or hazardous environments, inside structures and engines, in clothes, and for health monitoring and assistance.
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  • 03 Nov 2022
Topic Review
Global Buddhist Network
The Global Buddhist Network (GBN), previously known as the Dhammakaya Media Channel (DMC) is a Thai online television channel concerned with Buddhism. The channel's taglines were "The secrets of life revealed" and "The only one", but these were later replaced by "Channel for the path to the cessation of suffering and attainment of Dhamma". The channel features many types of programs with Buddhist content, and has programs in several languages. The channel started in 2002, as a means to reach remote provinces in Thailand. Controversially, the channel made international headlines in 2012 when it featured a teaching on the afterlife of Steve Jobs. On 26 December 2016, Thai authorities withdrew the permit for the satellite channel permanently, during the legal investigations into the temple by the Thai junta. In April 2017, it was reported, however, that the channel's programming had continued, but broadcast through the Internet only. In its online format, the channel has been renamed Global Buddhist Network.
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Topic Review
TUTOR (Programming Language)
TUTOR (also known as PLATO Author Language) is a programming language developed for use on the PLATO system at the University of Illinois at Urbana-Champaign around 1965. TUTOR was initially designed by Paul Tenczar for use in computer assisted instruction (CAI) and computer managed instruction (CMI) (in computer programs called "lessons") and has many features for that purpose. For example, TUTOR has powerful answer-parsing and answer-judging commands, graphics, and features to simplify handling student records and statistics by instructors. TUTOR's flexibility, in combination with PLATO's computational power (running on what was considered a supercomputer in 1972), also made it suitable for the creation of many non-educational lessons—that is, games—including flight simulators, war games, dungeon style multiplayer role-playing games, card games, word games, and medical lesson games such as Bugs and Drugs (BND).
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Topic Review
Distance Geometry Problem
The distance geometry problem is that of characterization and study of sets of points based only on given values of the distances between member pairs. Therefore distance geometry has immediate relevance where distance values are determined or considered, such as biology, sensor network, surveying, cartography, and physics.
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