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YeAH-TCP: Yet Another Highspeed TCP

In recent years, several new TCP congestion control algorithms have been proposed to improve TCP performance over very fast, long-distance networks. High bandwidth delay products require more aggressive window adaptation rules, yet maintaining the ability of controlling router buffer congestion. We define a relatively simple experimental scenario to compare most current high speed TCP proposals...

Permanent is hard to compute even on a good day

We give an exposition of Cai, Pavan and Sivakumar’s result on the hardness of permanent. They show that assuming it is hard to compute the permanent in the worst case, an algorithm cannot compute the permanent correctly even on (say) a 1/n fraction of the inputs.

Food fortification: good to have or need to have?

Only very small quantities of vitamins and minerals are needed for human health but deficiencies can have disproportionately large, often life-threatening, effects. Micronutrient deficiencies lead to a vicious cycle of malnutrition and infection in poorly nourished populations. Fortification of staple foods is the cheapest, most efficient and most effective way to supply large populations with ...

Dairy Cattle Must Have Good Forage

Guidelines have done more harm than good.

Practice guidelines have proliferated in medicine but their impact on actual practice and outcomes is difficult, if not impossible, to quantify. Though guidelines are based largely on observational data and expert opinion, it is widely believed that adherence to them leads to improved outcomes. Data to support this belief simply does not exist. If guidelines are universally ignored, their impac...