We now focus on the detailed comparison with MNC [1], which is the method most closely related to ours and achieves the best performance after us. In Table 1, we provide the detailed evaluation over all the classes of the Pascal VOC 2012 dataset [2] using IoU thresholds of 0.5 and 0.7, respectively. Note that our method outperforms this baseline for most classes, with a particularly large margi...

Serum opacity factor (SOF) is a bifunctional cell surface protein expressed by 40–50% of group A streptococcal (GAS) strains comprised of a C-terminal domain that binds fibronectin and an N-terminal domain that mediates opacification of mammalian sera. SOF is co-transcribed in a twogene operon with another fibronectin-binding protein, SfbX. We compared the ability of an SOF(+) wild-type (WT) se...

BACKGROUND & OBJECTIVES Rheumatic fever (RF)/rheumatic heart disease (RHD) caused by Group A streptococcus (GAS) are more prevalent in north India as compared to the western world, where invasive diseases are common. This could be due to variation in the virulence of GAS in different geographic locations. Hence, we studied the virulence potential of GAS isolated from the throat of children from...

During natural infection, gonococcal opacity proteins (Opa) undergo rapid phase variation, but how this phenomenon contributes to the virulence of the bacteria is not well understood. In the present immunomorphological study we examined the actual Opa status of individual gonococci during various stages of gonococcal infection of Chang epithelial cells, by probing ultrathin sections of infected...

In this paper, we investigate opacity of discrete event systems. We define two types of opacities: strong opacity and weak opacity. Given a general observation mapping, a language is strongly opaque if all strings in the language are confused with some strings in another language and it is weakly opaque if some strings in the language are confused with some strings in another language. We show ...

Guerraoui and Kapalka defined opacity as a safety criterion for transactional memory algorithms in 2008. Researchers have shown how to prove opacity, while little is known about pitfalls that can lead to non-opacity. In this paper, we identify two problems that lead to nonopacity, we present automatic tool support for finding those problems, and we prove an impossibility result. We first show t...