This article sorts the returns of listed companies in A-share market from May 1991 to April 2022 over past J months, selects winners and losers, constructs a zero investment portfolio, holds it for K months. The results showed that there is reversal effect short term momentum medium long term. Only when holding period one month, no obvious pattern can be observed. interested combination losers ...

P management is a crucial component of information security management. An important problem within this context from a vendor’s perspective is to determine how to release patches to fix vulnerabilities in its software. From a firm’s perspective, the issue is how to update vulnerable systems with available patches. In this paper, we develop a game-theoretic model to study the strategic interact...

the main aim in this research has been to determining the growth regime in iran based on an open economy concerning the bhaduri and marglin(1990) model.  this model which has been widely used in post keynesian economics is a kaleckian-post keynesian macroeconomic model which is based on effective demand. bhaduri and marglin(1990) concerning wage as a cost item as well as a component of aggregat...

Data sharing is increasingly becoming an essential component of clinical practice and biomedical research. The debate has shifted from whether or not to exchange data to how best to achieve optimal sharing. This raises new ethical and legal challenges, particularly with regard to consent and privacy. This article discusses recent developments in the formulation of best practice guidelines for d...