In this snapshot, Wally Feurzeig, one of the originators of Logo, and an innovative designer of mathematics education learning environments, recalls some compelling vignettes from the early history of Logo (including activities with the first Logo-controlled wireless turtle), with children ranging in age from pre-schoolers to fifth-graders. Wally passed away this past year. Wally was a long-tim...

The research community has adopted a sequence of snapshots as the logical representation of evolving graphs — graphs that change over time and whose history of evolution we want to preserve for analysis. This paper argues that the snapshot sequence model of evolving graphs is insufficient for representation and analysis of a wide range of networks. Instead, we propose to use the interval model ...

Data Snapshot technology is a standard feature of modern storage systems. Most such systems use copy-on-write techniques to manage snapshot data in order to optimize storage space requirements for maintaining history data. Copy-on-write methods tend to write data out-of-place at a location which may be far away from the original location of the data on the disk. This phenomenon gradually leads ...

Smartphones are being adopted en-masse throughout the world. Its adoption in education has witnessed a diversity of implementations with various outcomes. In particular, seamless learning is a broad pedagogical approach key in mobile learning design. With the goals of enhancing academic achievement and self-directed learners, a trial smartphone-enabled implementation was carried out for a unit ...

This review explores the key factors that influence the optimization, routine use, and profile interpretation of the SNaPshot single-base extension (SBE) system applied to forensic single-nucleotide polymorphism (SNP) genotyping. Despite being a mainly complimentary DNA genotyping technique to routine STR profiling, use of SNaPshot is an important part of the development of SNP sets for a wide ...

Regulated necrosis, termed necroptosis, is mediated by the kinase activity of RIPK1 and RIPK3. It has distinct cellular features that are different than apoptosis. Necroptosis can be triggered by extracellular stimuli known to activate inflammation and cell death and its intracellular signaling pathway involves necrosome formation and MLKL activation. Inhibition of necroptosis has been shown to...

We present a sequence of constructions of commuting synchronization objects (e.g., fetch-and-increment and fetch-and-add) in a system of n processors from any two processor synchronization object whose consensus number is two or more Her91a]. Each implementation in the sequence uses a particular type of shared memory snapshot, as a building block. Later implementations in the sequence are based...