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Akizuki-class Destroyer (2010)
The ''Akizuki'' class of destroyers of the Japan Maritime Self-Defense Force is intended to escort the and helicopter destroyers, and safeguard the other Aegis-capable warships such as the and . The destroyer provides defense against surface, airborne and undersea threats. The class was initially designated as "19DD", referring to a date on the Japanese calendar, specifically the 19th fiscal year of the Heisei period (2007). Design The hull structure was based on the one of the Takanami-class destroyers. There are many small improvements, such as cleaner lines to reduce the radar signature and decoys for torpedoes; but the principal changes can be summed up as more powerful engines, sensors, sonar and the indigenous ATECS battle management system that has been called the ''Japanese AEGIS''. The main gas turbine engines are standardized on a higher-powered version of the Rolls-Royce Spey SM1C, in contrast to the combination of Rolls-Royce SM1C and General Electric LM2500 turb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Destroyer
In naval terminology, a destroyer is a fast, manoeuvrable, long-endurance warship intended to escort larger vessels in a fleet, convoy or battle group and defend them against powerful short range attackers. They were originally developed in 1885 by Fernando Villaamil for the Spanish NavySmith, Charles Edgar: ''A short history of naval and marine engineering.'' Babcock & Wilcox, ltd. at the University Press, 1937, page 263 as a defense against torpedo boats, and by the time of the Russo-Japanese War in 1904, these "torpedo boat destroyers" (TBDs) were "large, swift, and powerfully armed torpedo boats designed to destroy other torpedo boats". Although the term "destroyer" had been used interchangeably with "TBD" and "torpedo boat destroyer" by navies since 1892, the term "torpedo boat destroyer" had been generally shortened to simply "destroyer" by nearly all navies by the First World War. Before World War II, destroyers were light vessels with little endurance for unatte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
RUM-139 VL-ASROC
The RUM-139 VL-ASROC is an anti-submarine missile in the ASROC family, currently built by Lockheed Martin for the U.S. Navy. History Design and development of the missile began in 1983 when Goodyear Aerospace was contracted by the U.S. Navy to develop a ship-launched anti-submarine missile compatible with the new Mark 41 Vertical Launching System. The development of the VLS ASROC underwent many delays, and it was not deployed on any ships until 1993. During this development, Goodyear Aerospace was bought by Loral Corporation in 1986, and this defense division was in turn purchased by Lockheed Martin in 1995. The first VLS ASROC missile was an RUR-5 ASROC with an upgraded solid-fuel booster section and a digital guidance system. It carries a lightweight Mark 46 homing torpedo that is dropped from the rocket at a precalculated point on its trajectory, and then parachuted into the sea. Beginning in 1996, the missile was replaced by the newer RUM-139A and subsequently the RUM-1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Distributed Computing
A distributed system is a system whose components are located on different networked computers, which communicate and coordinate their actions by passing messages to one another from any system. Distributed computing is a field of computer science that studies distributed systems. The components of a distributed system interact with one another in order to achieve a common goal. Three significant challenges of distributed systems are: maintaining concurrency of components, overcoming the lack of a global clock, and managing the independent failure of components. When a component of one system fails, the entire system does not fail. Examples of distributed systems vary from SOA-based systems to massively multiplayer online games to peer-to-peer applications. A computer program that runs within a distributed system is called a distributed program, and ''distributed programming'' is the process of writing such programs. There are many different types of implementations for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
C4ISTAR
Command and control (abbr. C2) is a "set of organizational and technical attributes and processes ... hatemploys human, physical, and information resources to solve problems and accomplish missions" to achieve the goals of an organization or enterprise, according to a 2015 definition by military scientists Marius Vassiliou, David S. Alberts, and Jonathan R. Agre. The term often refers to a military system. Versions of the United States Army ''Field Manual 3-0'' circulated circa 1999 define C2 in a military organization as the exercise of authority and direction by a properly designated commanding officer over assigned and attached forces in the accomplishment of a mission. A 1988 NATO definition is that command and control is the exercise of authority and direction by a properly designated individual over assigned resources in the accomplishment of a common goal. An Australian Defence Force definition, similar to that of NATO, emphasises that C2 is the system empowering desi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
General Electric LM2500
The General Electric LM2500 is an industrial and marine gas turbine produced by GE Aviation. The LM2500 is a derivative of the General Electric CF6 aircraft engine. As of 2004, the U.S. Navy and at least 29 other navies had used a total of more than one thousand LM2500/LM2500+ gas turbines to power warships. Other uses include hydrofoils, hovercraft and fast ferries. In 2012, GE developed an FPSO version to serve the oil and gas industry's demand for a lighter, more compact version to generate electricity and drive compressors to send natural gas through pipelines. Design and development The LM2500 was first used on the US Navy in 1969, after the original FT-4 gas turbines experienced many technical problems. Later, they were used in US Navy warships in the of destroyers and the related , which were constructed from 1970. In this configuration it was rated to . This configuration was subsequently used into the 1980s in the s, and s. It was also used by one of People's Rep ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Takanami-class Destroyer
The is a class of destroyer serving with the Japan Maritime Self-Defense Force (JMSDF). This warship is the slightly modified class of second-generation, general-purpose destroyers of the JMSDF. Background Since FY1991, the JMSDF started construction of the second-generation, , . These destroyers are generally satisfactory for the fleet, but there is some discontent. From FY1998 onwards, a slightly modified version that corrected these dissatisfaction points was to be built: ''Takanami'' class. Design The hull design is generally based on the one of the ''Murasame'' class. However, the weapons mounted are different, and as a result, the internal structure has also been changed. The large lattice mast affected the stealthiness of the ''Murasame'' class, so in ''Takanami'' class, it was planned to change to two small masts, but that was not implemented. Although their displacement become slightly increased, there was no change to their main engines, as it was not a big differe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
JS Akizuki (DD-115) Seen From Ōnami, -8 Oct
JS ''Akizuki'' (DD-115) is the lead ship of Akizuki-class destroyers. She was commissioned on 14 March 2012. Construction and career ''Akizuki'' was laid down at Mitsubishi Heavy Industries Nagasaki Shipyard & Machinery Works on July 17, 2009, as the 2007 plan 5,000-ton type escort ship No. 2244 based on the medium-term defense capability development plan, launched and named on October 13, 2010. Launch, the public trial started on July 28, 2011, commissioned on March 14, 2012, and was incorporated into the 5th escort group of the 1st escort group. The fixed port is Sasebo base. On July 5, 2015, as the 22nd dispatched anti-piracy action surface corps, sailed from Sasebo base to the Gulf of Aden off the coast of Somalia with JS Sawagiri.https://www.mod.go.jp/js/Press/press2015/press_pdf/p20150622_03.pdf On April 18, 2021, she departed from Sasebo base as the 5th dispatch information gathering activity water squadron. In addition to conducting PCR tests on all crew memb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heisei Period
The is the period of Japanese history corresponding to the reign of Emperor Emeritus Akihito from 8 January 1989 until his abdication on 30 April 2019. The Heisei era started on 8 January 1989, the day after the death of the Emperor Hirohito, when his son, Akihito, acceded to the throne as the 125th Emperor. In accordance with Japanese customs, Hirohito was posthumously renamed "Emperor Shōwa" on 31 January 1989. Thus, 1989 corresponds to Shōwa 64 until 7 January, and from 8 January. The Heisei era ended on 30 April 2019 (Heisei 31), with the abdication of Akihito from the Chrysanthemum Throne. It was succeeded by the Reiwa era as then-crown prince Naruhito ascended the throne on 1 May midnight local time. History and meaning On 7 January 1989, at 07:55 AM JST, the Grand Steward of Japan's Imperial Household Agency, Shōichi Fujimori, announced Emperor Hirohito's death at 6:33 AM JST, and revealed details about his cancer for the first time. Shortly after t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japanese Calendar
Japanese calendar types have included a range of official and unofficial systems. At present, Japan uses the Gregorian calendar together with year designations stating the year of the reign of the current Emperor. The written form starts with the year, then the month and finally the day, coinciding with the ISO 8601 standard. For example, February 16, 2003 can be written as either 2003年2月16日 or 平成15年2月16日 (the latter following the regnal year system). 年 reads ''nen'' and means "year", 月 reads ''gatsu'' or 「がつ」and means "month" and finally 日 (usually) reads ''nichi'' (its pronunciation depends on the number that precedes it, see below) and means "day". Prior to the introduction of the Gregorian calendar in 1873, the reference calendar was based on the lunisolar Chinese calendar. History The lunisolar Chinese calendar was introduced to Japan via Korea in the middle of the sixth century. After that, Japan calculated its calendar using various Chi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aegis Combat System
The Aegis Combat System is an American integrated naval weapons system developed by the Missile and Surface Radar Division of RCA, and it is now produced by Lockheed Martin. Initially used by the United States Navy, Aegis is now used also by the Japan Maritime Self-Defense Force, Spanish Navy, Royal Norwegian Navy, Republic of Korea Navy, and Royal Australian Navy, and is planned for use by the Royal Canadian Navy. As of 2022, a total of 110 Aegis-equipped ships have been deployed, and 71 more are planned (see operators). Aegis BMD (Ballistic Missile Defense) capabilities are being developed as part of the NATO missile defence system. Etymology The word "Aegis" is a reference that dates back to Greek mythology, with connotations of a protective shield, as the Aegis was the buckler (shield) of Zeus, worn by Athena. Overview The Aegis Combat System (ACS) is an advanced command and control (command and decision, or C&D, in Aegis parlance) system that uses powerful computers a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Japan Maritime Self-Defense Force
, abbreviated , also simply known as the Japanese Navy, is the maritime warfare branch of the Japan Self-Defense Forces, tasked with the naval defense of Japan. The JMSDF was formed following the dissolution of the Imperial Japanese Navy (IJN) after World War II. The JMSDF has a fleet of 154 ships, 346 aircraft and 50,800 personnel. History Origin Following Japan's defeat in World War II, the Imperial Japanese Navy was dissolved by the Potsdam Declaration acceptance. Ships were disarmed, and some of them, such as the battleship , were taken by the Allied Powers as reparation. The remaining ships were used for repatriation of the Japanese soldiers from abroad and also for minesweeping in the area around Japan, initially under the control of the ''Second Bureau of the Demobilization Ministry''. The minesweeping fleet was eventually transferred to the newly formed Maritime Safety Agency, which helped maintain the resources and expertise of the navy. Japan's 1947 Constitution ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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