A compressed self-index using a Ziv–Lempel dictionary

A compressed full-text self-index for a text T, of size u, is a data structure used to search for patterns P, of size m, in T, that requires reduced space, i.e. space that depends on the empirical entropy (H _k or H ₀) of T, and is, furthermore, able to reproduce any substring of T. In this paper we present a new compressed self-index able to locate the occurrences of P in O((m + occ)log u) time, where occ is the number of occurrences. The fundamental improvement over previous LZ78 based indexes is the reduction of the search time dependency on m from O(m ²) to O(m). To achieve this result we point out the main obstacle to linear time algorithms based on LZ78 data compression and expose and explore the nature of a recurrent structure in LZ-indexes, the suffix tree. We show that our method is very competitive in practice by comparing it against other state of the art compressed indexes.

An Approach for Doctoral Students Conducting Context-Specific Review of Literature in IT,ICT, and Educational Technology

Since 1980s the rate of technological change has been phenomenal, creating an impact on the information-seeking behaviors of doctoral students and other researchers. When searching the three fields of Information Technology (IT), Information and Communication Technology (ICT), and Educational Technology (EdTech), it is like opening a Pandora's Box; the variation in terminology is obvious. This makes searching, managing, and evaluating sources in these interdisciplinary fields challenging, and doctoral students trying to classify and analyze technology related studies can easily be overwhelmed. We offer a systematic, practical approach for reviewing and categorizing the literature by providing key search terms, a list of e-Journals, and an organizational structure for naming and framing studies. Doctoral students navigating their way through the literature review may find our resourcesa table-of-contents, an overview of the technology-related literature, and an annotated excerpt of an examined thesis—useful for writing a critical review.     

The Public Library System as an Element in the 2007 and 2015 Electoral Programs of Spain's Political Parties in the Region of Castilla-La Mancha

To assess the relevance of the Public Library System in the political agenda, programs presented by the Political Parties competing in Regional and Local elections in the Spanish Region of Castilla-La Mancha were analyzed and the proposals about these library institutions were identified.

All Regional programs were collected and also an ample sample from the Municipalities for the 2007 and 2015 elections, trying to find the differences influenced by the impact of the financial crisis and recession on the public-library policies.

The conclusion arrived at was that, although the Public Libraries may be reasonably present in the studied programs, there is a low awareness by the Political Parties of the main problems.     

Self-assessment of competences and their impact on the perceived chances for a successful university-to-work transition: the example of tourism degree students in Poland

Tertiary Education and Management - Competences are the most important career capital a university graduate can have. The objective of the paper is to determine which competences acquired at...     

Action protocol for the use of robotics in students with Autism Spectrum Disoders: A systematic-review

Education and Information Technologies - During the last two decades, the use of Information and Communication Technologies (ICT) has opened new paths in the intervention of people with Autism...     

Learning environment and students’ classroom behavior differences between effective,average, and ineffective urban elementary schools for Hispanic students

Educational Research for Policy and Practice - This study examined whether there are significant differences between effective, average, and ineffective urban schools with regard to (a)...     

Cytocompatible cellulose nanofibers from invasive plant species Agave americana L. and Ricinus communis L.: a renewable green source of highly crystalline nanocellulose

In this study, the fibers of invasive species Agave americana L. and Ricinus communis L. were successfully used for the first time as new sources to produce cytocompatible and highly crystalline cellulose nanofibers. Cellulose nanofibers were obtained by two methods, based on either alkaline or acid hydrolysis. The morphology, chemical composition, and crystallinity of the obtained materials were characterized by scanning electron microscopy(SEM) together with energy-dispersive X-ray spectroscopy(EDX), dynamic light scattering(DLS), X-ray diffraction(XRD), and Fourier transform infrared(FTIR)spectroscopy. The crystallinity indexes(CIs) of the cellulose nanofibers extracted from A. americana and R. communis were very high(94.1% and 92.7%, respectively). Biological studies evaluating the cytotoxic effects of the prepared cellulose nanofibers on human embryonic kidney 293 T(HEK293 T) cells were also performed. The nanofibers obtained using the two different extraction methods were all shown to be cytocompatible in the concentration range assayed(i.e., 0-500 μg/mL). Our results showed that the nanocellulose extracted from A. americana and R. communis fibers has high potential as a new renewable green source of highly crystalline cellulose-based cytocompatible nanomaterials for biomedical applications.     

Peer and self-assessment applied to oral presentations from a multidisciplinary perspective

This article analyses the use of peer and self-assessment in oral presentations as complementary tools to assessment by the professor. The analysis is based on a study conducted at the University of Girona (Spain) in seven different degree subjects and fields of knowledge. We designed and implemented two instruments to measure students’ peer and self-assessment, and a rubric to guide the assessment process. Results were compared with the marks awarded by the professor. In contrast with studies by other authors, which show a high correlation between these different assessment systems, our study revealed significant deviations. Applying peer and self-assessment to oral presentation activities also demonstrates their formative value above and beyond their summative usefulness.     

When Parents Want Children to Stay Home for College

Although previous studies show that a majority of parents want their children to go to college and graduate with a 4-year degree, the strategies used to accomplish this goal vary widely. While some parents feel it is important for their children to attend school while living at home (college-at-home parents), others do not (college-anywhere parents). This study investigates the influence of these parental strategy preferences on whether children apply to college during their senior year of high school, as well as whether they apply to multiple colleges. Net of measured ability, socioeconomic factors, and students’ own strategy preferences, students with college-at-home parents are significantly less likely to apply to college than students with college-anywhere parents; and among those who do apply to college, students with college-at-home parents are significantly less likely to apply to multiple colleges.     

The development of analogical reading in Spanish

The use and development of analogical processes in learning to read in Spanish are presented. In the first experiment, the results show that children of 6 years old show analogical effects in reading pseudowords and that the magnitude of this effect is the same as with 10 years old children. However, it is found that children of 10 years old make many lexicalizations when reading pseudowords (about 50% of the items). In experiment 2 this finding is further analyzed. The results show that 9 years old children make more lexicalizations than adult control subjects do. It is suggested that the development of analogical procedures is a fast process (6 years old children already have done it), but that the precise control of lexical information over perceptual one is a later process.