Speculative execution attacks present an enormous security threat, capable of reading arbitrary program data under malicious speculation, and later exfiltrating that over microarchitectural covert channels. This paper proposes speculative taint tracking (STT), a high performance hardware mechanism to block these attacks. The main idea is it safe execute selectively forward the results instructi...

Various types of ‘bubbles’, e.g. stock market, housing, dot.com, high-tech, historically, are commonlyobserved phenomena in complex systems. Yet, their emergence often surprises people who remain unaware of history or their systemic roots. Bubbles are often considered to be simply the product of unwise speculative investments or social mania. Alternatively, conventional economic theories often ...

Using a novel proxy of investors’ speculative demand constructed from online search interest in “concept stocks”, we examine how speculative demand affects the returns and trading volume of Chinese stock indices. We find that returns and trading volume increase with the contemporaneous speculative demand. In addition, the high speculative demand causes lower near future returns, while recent hi...

T his paper investigates the movement between stock market bubbles and fluctuations in aggregate variables within a DSGE model for the Iranian economy. We apply a new Keynesian monetary framework with nominal rigidity in wages and prices based on the study by Ikeda (2013), which is developed with appropriate framework for the Iranian economy. We consider central bank behavior differe...

A new recursive regression methodology is introduced to analyze the bubble characteristics of various financial time series during the subprime crisis. The methods modify a technique proposed in Phillips, Wu, and Yu (2011) and provide a technology for identifying bubble behavior with consistent dating of their origi-nation and collapse. The tests serve as an early warning diagnostic of bubble a...

Gas release in photic-zone microbialites can lead to preservable morphological biosignatures. Here, we investigate the formation and stability of oxygen-rich bubbles enmeshed by filamentous cyanobacteria. Sub-millimetric and millimetric bubbles can be stable for weeks and even months. During this time, lithifying organic-rich laminae surrounding the bubbles can preserve the shape of bubbles. Cm...