The paper discusses the problem of choice of optimal portfolios in multi period risk investment by safety first criterion.

本文讨论了用安全第一的一个标准选择最佳多期风险资产组合的问题。

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Using the expression way of general event probability to fuzzy event probability, common method of probability can find fuzzy event period risk for fuzzy network planning.

对模糊型网络计划，计算模糊工期风险概率是利用模糊事件概率的普通事件概率表示方法，用常规的概率方法求解。

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During the same period, families have been asked to absorb much more risk in their retirement income.

在同一时期，家庭的退休收入承担了更多风险。

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His research shows that those taking the medications for more than four years have a higher risk of a fracture than people taking the drugs for a short period of time.

VOA: standard.2010.03.14

The first 10 days after the injury appear to be the period of greatest risk for another concussion.

WSJ: Tougher Rules Advised for Athletes After Concussion

But it is also likely that he sees the next few months as the period of greatest risk for Mr Blair before the next election.

ECONOMIST: Bagehot

In that period, once risk premiums fell, value emerged.

FORBES: Are Equities Cheap Right Now? No, UBS Says