Microring-based photonic fractional differentiators play an important role in the on-chip all-optical signal processing. Unfortunately, the previous works do not consider the time-reversal and the time delay characteristics of the microring-based fractional differentiator. They also do not include the effect of input pulse width on the output. In particular, it cannot explain why the microring-...

this commentary discusses pertinent issues from hyosun kim’s paper on online prescription drug promotion. the study is well-designed and the findings highlight some of the consequences of the food and drug administration’s (fda’s) decision to deregulate online advertising of prescription drugs. while kim’s findings confirm some of the early concerns, they also provide a perspective of implement...

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