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.
![]() Arai at 2016 Bislett Games | ||||||||||||||||||||
Personal information | ||||||||||||||||||||
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Born | Saitama Prefecture | 23 June 1991|||||||||||||||||||
Education | Kokushikan University[1] | |||||||||||||||||||
Height | 1.83 m (6 ft 0 in)[2] | |||||||||||||||||||
Weight | 90 kg (200 lb) | |||||||||||||||||||
Sport | ||||||||||||||||||||
Sport | Track and field | |||||||||||||||||||
Event(s) | Javelin throw | |||||||||||||||||||
Club | Suzuki Hamatsu AC | |||||||||||||||||||
Coached by | Yoshinari Kuriyama | |||||||||||||||||||
Medal record
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His personal best in the event is 86.83 metres set in Isahaya in 2014.
Competition record
Year | Competition | Venue | Position | Event | Notes |
---|---|---|---|---|---|
Representing ![]() | |||||
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
- 2013 WSG profile
- 2014 AG profile Archived 2014-10-07 at the Wayback Machine
- Ryohei Arai at World Athletics
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