In this paper we explore patterns in student behavior as they answer questions about documents they are reading. In earlier work [4] we showed that as students answer a question online, they can be categorized into one of 4 different clusters of “reading-scanning-scrolling” behaviors. Further, their readingscanning-scrolling behavior category predicts the quality of their answer to that particu...

Cluster stability research is involved with the validity of clusters generated by a clustering algorithm. In other words, it answers whether generated clusters are true clusters or due to chance. Estimating true numbers of clusters is related to this problem, since often the cluster validity is based on this estimate. In the literature, there are a number of methods available for both purposes....

Calixarene-capped Co(32) clusters are constructed by a sodalite Co(II)(24) cage and an encapsulated Co(III)(8) cube. The spherical units are arranged into three isomeric structures, two of which are stacked by the bcc lattices and the third of which is assembled by the cubic closest packing of the spherical units.

this study presents an overview of the different strategies that persian learners of english employ to deal with initial clusters. while vowel epenthesis appears to be the most widespread repair strategy to conform such clusters to persian phonotactics, the location of the epenthetic vowel varies. in this paper, we investigate two approaches that seek to explain the epenthetic site. the first o...

Mycobacteriophages infect members of the Mycobacterium genus in the phylum Actinobacteria and exhibit remarkable diversity. Genome analysis groups the thousands of known mycobacteriophages into clusters, of which the B1 subcluster is currently the third most populous. We report the complete genome sequences of five additional members of the B1 subcluster.

o ne of the effective strategies for economic development of clusters is the conduct of networking activities by cluster members. indeed, the majority of cluster members are micro and small enterprises, so, should attempt to overcome their inherent constraints and influence the market through networking activities. in addition, these enterprises lack an intra-firm research and development unit ...

Here, we propose a clustering technique for general clustering problems including those that have non-convex clusters. For a given desired number of clusters K, we use three stages to find a clustering. The first stage uses a hybrid clustering technique to produce a series of clusterings of various sizes (randomly selected). They key steps are to find a K-means clustering using K` clusters wher...

PORTER M. E. (2003) The economic performance of regions, Reg. Studies 37, 549–578. This paper examines the basic facts about the regional economic performance, the composition of regional economies and the role of clusters in the US economy over period of 1990 to 2000. The performance of regional economies varies markedly in terms of wage, wage growth, employment growth and patenting rate. Base...

In this paper we present the first BV I CCD photometry of six overlooked old open clusters (Berkeley 44, NGC 6827, Berkeley 52, Berkeley 56, Skiff 1 and Berkeley 5) and derive estimates of their fundamental parameters by using isochrones from the Padova library (Girardi et al. 2000). We found that all the clusters are older than the Hyades, with ages ranging from 0.8 (NGC 6827 and Berkeley 5) t...

Binary clusters account for more than 10% of the cluster population in the Magellanic Clouds. Statistically fewer than 50% of the found pairs are expected to be chance superpositions. We estimated the cluster encounter rate and suggest that tidal capture is an unlikely formation scenario for the formation of binary clusters. Thus, most true binary clusters can be expected to have formed togethe...