Korea is a regional power and a highly developed country, with its economy being ranked as the world's thirteenth-largest by nominal GDP and the fourteenth-largest by GDP (PPP). It ranks nineteenth globally by Human Development Index, and has the third-highest life expectancy in the world. In recent years, the country has been facing an aging population and the lowest fertility rate in the world. South Korea's citizens enjoy one of the world's fastest Internet connection speeds and the densest high-speed railway network. The country is the world's ninth-largest exporter and ninth-largest importer. Its armed forces are ranked as one of the world's strongest militaries, with the world's second-largest standing army by military and paramilitary personnel. Since the 21st century, South Korea has been renowned for its globally influential pop culture, particularly in music (K-pop), TV dramas (K-dramas) and cinema, a phenomenon referred to as the Korean wave. It is a member of the OECD's Development Assistance Committee, the G20, the IPEF, and the Paris Club. Etymology The name Korea derives from the name Goryeo. The name Goryeo itself was first used by the ancient kingdom of Goguryeo, which was considered a great power of East Asia during its time, in the 5th century as a shortened form of its name. The 10th-century kingdom of Goryeo succeeded Goguryeo, and thus inherited its name, which was pronounced by the visiting Arab and Persian merchants as "Korea". The modern name of Korea, appears in the first Portuguese maps of 1568 by João vaz Dourado as Conrai and later in the late 16th century and early 17th century as Korea (Corea) in the maps of Teixeira Albernaz of 1630. The kingdom of Goryeo became first known to Westerners when Afonso de Albuquerque conquered Malacca in 1511 and described the peoples who traded with this part of the world known by the Portuguese as the Gores. Despite the coexistence of the spellings Corea and Korea in 19th century publications, some Koreans believe that Imperial Japan, around the time of the Japanese occupation, intentionally standardized the spelling on Korea, making Japan appear first alphabetically. After Goryeo was replaced by Joseon in 1392, Joseon became the official name for the entire territory, though it was not universally accepted. The new official name has its origin in the ancient kingdom of Gojoseon (2333 BCE). In 1897, the Joseon dynasty changed the official name of the country from Joseon