Posts by David Hood

  • Hard News: Our own fake news,

    Reason and ridicule may work better than empathy in stopping such beliefs

    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5061726/

    Dunedin • Since May 2007 • 1441 posts Report Reply

  • Hard News: Blockchain, what is it?, in reply to Neil Graham,

    Bitcoin is typically hashed using ASICs which are far more energy efficient.

    The best estimate for bitcoin is 94 kWh per transaction. Working here: https://motherboard.vice.com/en_us/article/ypkp3y/bitcoin-is-still-unsustainable

    Dunedin • Since May 2007 • 1441 posts Report Reply

  • Hard News: Blockchain, what is it?, in reply to Moz,

    Have any of the crypto-currency/blockchain people solved the fundamental problem of power consumption?

    Nope.

    From a Motherboard/Vice article yesterday Ethereum transactions are estimated to take 45 kilowatt-hours of electricity per transaction, VISA is estimated at 0.00651 kWh per transaction.

    https://motherboard.vice.com/en_us/article/d3zn9a/ethereum-mining-transaction-electricity-consumption-bitcoin

    Dunedin • Since May 2007 • 1441 posts Report Reply

  • Hard News: Fear of Cycling, in reply to Moz,

    rather than the 1-2 you’d expect from the 1% number.

    The expect really hinges on how much damage you expect people to take in an accident- giving the prevailing wisdom that the short term risk is balanced by the long term health benefits it starts to devolve into arguments about what a reasonable rate is.

    Broadly speaking I would say everyone is safer in their own custom transport space, and pretty much all the risk is at shared spaces (i.e. intersections where all three groups intermix unavoidably).

    Dunedin • Since May 2007 • 1441 posts Report Reply

  • Hard News: Fear of Cycling,

    Starting to get a few numbers in (some hospital data and road use data). In terms of fear of cycling and risks, cyclists have about as much risk of hospitalisation/death from stationary objects as cars (but the stationary objects are not in the hands of other people which is where the fear comes from).

    For pedestrians if we take km traveled as an indicator of how much they are on the road, cyclists is almost exactly 1% of cars, however among pedestrian hospitalisations collisions with cyclists are at a rate of 2.83% of cars (95% confidence interval 1.84 to 4.2) suggesting that for hospitalisation injuries the risk to pedestrians is higher per cycle than per car.

    Dunedin • Since May 2007 • 1441 posts Report Reply

  • Hard News: Fear of Cycling, in reply to Stephen R,

    so I’m not sure shared pedestrian/cycleways are without drawbacks for bike-commutes.

    The pedestrian cyclist issues in a shared carriageway do seem to mirror the cyclist car issues when they share space. As I understand it, in Japan the less vulnerable party in an accident is normally held responsible, so in general cars are held responsible for accidents with cycles, and cycles are held responsible for accidents with pedestrians. A couple of articles:

    http://www.japantimes.co.jp/news/2015/06/29/reference/law-gets-serious-cycling-safety/#.WM8EtRhh3UI

    https://www.japantoday.com/category/crime/view/driver-who-killed-cyclist-in-crosswalk-accident-found-not-guilty

    Dunedin • Since May 2007 • 1441 posts Report Reply

  • Hard News: Fear of Cycling, in reply to linger,

    In the NZ case, historically, the answer would have to be “not much”, because cyclists and pedestrians weren’t supposed to be sharing paths.

    For pedestrians, I think hospital stats show it a pretty major thing at intersections or road crossing- pedestrian risk is very low on the footpath then skyrockets to massive when they have to leave them (basically once a block) and share space with anyone else.

    Shared cycle/pedestrian pathways may increase cyclist-pedestrian collisions, but overall are a positive development because they help isolate cyclists – and pedestrians – from motorists

    It is not an even impact- older pedestrians (and there is a very big difference in the age profiles between cyclists and pedestrians) are fragile with respect to being struck by cycles in a way that younger people are less so.

    I am in the early stages of sounding out getting some data in this area.

    Dunedin • Since May 2007 • 1441 posts Report Reply

  • Hard News: Fear of Cycling,

    Does the decrease in the number of cyclists also decrease the incidence of pedestrian vs cyclist injuries - These wouldn't get tracked if you were basing measures of injury on NZTA figures via police reports, as I understand it the NZTA figures are essentially "car vs. ..." (for example if you look at hospitalisations I understand the leading injury for cyclists is themselves- falling over when no other party is involved).

    Dunedin • Since May 2007 • 1441 posts Report Reply

  • Hard News: Meet the new bots, same as…,

    Speculatively, if there was contact between the Trump campaign and people they shouldn't be talking to, and the people they shouldn't have been talking to see there being more value in creating chaos for the administration than supporting it, then they can leak contact information to the degree that suits them.

    I am particularly musing about this in relation to today's Roger Stone says he was in contact with the DNC hackers but it was innocuous.

    Dunedin • Since May 2007 • 1441 posts Report Reply

  • Hard News: Meet the new bots, same as…,

    For the Twitterbots, I would hypothesise that if your primary intent is to cause chaos in the U.S. then you have no particular loyalty to any faction in the US and will boost or attack on the basis of what seems to cause the most friction.

    Dunedin • Since May 2007 • 1441 posts Report Reply

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