Ryohei Arai (athlete)

Ryōhei Arai (新井涼平, Ryōhei Arai, born 23 June 1991) is a Japanese athlete specialising in the javelin throw.[3] He represented his country at the 2015 World Championships finishing ninth. In addition, he won the silver at the 2014 Asian Games.

Ryōhei Arai
Arai at 2016 Bislett Games
Personal information
Born (1991-06-23) 23 June 1991
Saitama Prefecture
EducationKokushikan University[1]
Height1.83 m (6 ft 0 in)[2]
Weight90 kg (200 lb)
Sport
SportTrack and field
Event(s)Javelin throw
ClubSuzuki Hamatsu AC
Coached byYoshinari Kuriyama

His personal best in the event is 86.83 metres set in Isahaya in 2014.

Competition record

Year Competition Venue Position Event Notes
Representing  Japan
2013 Universiade Kazan, Russia 8th Javelin throw 75.53 m
2014 Asian Games Incheon, South Korea 2nd Javelin throw 84.42 m
2015 World Championships Beijing, China 9th Javelin throw 83.07 m
2016 Olympic Games Rio de Janeiro, Brazil 11th Javelin throw 79.47 m
2017 World Championships London, United Kingdom 23rd (q) Javelin throw 77.38 m
2018 Asian Games Jakarta, Indonesia 7th Javelin throw 75.24 m
2019 Asian Championships Doha, Qatar 3rd Javelin throw 81.93 m
World Championships Doha, Qatar 15th (q) Javelin throw 81.71 m

Seasonal bests by year

  • 2011 – 78.21
  • 2012 – 78.00
  • 2013 – 78.19
  • 2014 – 86.83
  • 2015 – 84.66
  • 2016 – 84.54
  • 2017 – 82.13
  • 2018 – 80.83
  • 2019 – 82.03
gollark: <@!206233133228490752> Sorry to bother you, but keypairs generated by `ccecc.py` and the ECC library in use in potatOS appear to have different-length private and public keys, which is a problem.EDIT: okay, apparently it's because I've been accidentally using a *different* ECC thing from SMT or something, and it has these parameters instead:```---- Elliptic Curve Arithmetic---- About the Curve Itself-- Field Size: 192 bits-- Field Modulus (p): 65533 * 2^176 + 3-- Equation: x^2 + y^2 = 1 + 108 * x^2 * y^2-- Parameters: Edwards Curve with c = 1, and d = 108-- Curve Order (n): 4 * 1569203598118192102418711808268118358122924911136798015831-- Cofactor (h): 4-- Generator Order (q): 1569203598118192102418711808268118358122924911136798015831---- About the Curve's Security-- Current best attack security: 94.822 bits (Pollard's Rho)-- Rho Security: log2(0.884 * sqrt(q)) = 94.822-- Transfer Security? Yes: p ~= q; k > 20-- Field Discriminant Security? Yes: t = 67602300638727286331433024168; s = 2^2; |D| = 5134296629560551493299993292204775496868940529592107064435 > 2^100-- Rigidity? A little, the parameters are somewhat small.-- XZ/YZ Ladder Security? No: Single coordinate ladders are insecure, so they can't be used.-- Small Subgroup Security? Yes: Secret keys are calculated modulo 4q.-- Invalid Curve Security? Yes: Any point to be multiplied is checked beforehand.-- Invalid Curve Twist Security? No: The curve is not protected against single coordinate ladder attacks, so don't use them.-- Completeness? Yes: The curve is an Edwards Curve with non-square d and square a, so the curve is complete.-- Indistinguishability? No: The curve does not support indistinguishability maps.```so I might just have to ship *two* versions to keep compatibility with old signatures.
gollark: > 2. precompilation to lua bytecode and compressionThis was considered, but the furthest I went was having some programs compressed on disk.
gollark: > 1. multiple layers of sandboxing (a "system" layer that implements a few things, a "features" layer that implements most of potatOS's inter-sandboxing API and some features, a "process manager" layer which has inter-process separation and ways for processes to communicate, and a "BIOS" layer that implements features like PotatoBIOS)Seems impractical, although it probably *could* fix a lot of problems
gollark: There's a list.
gollark: Lots of them.

References


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