Evaluates the performance of different methods of data compression coding in several situations. Huffman's code, arithmetic coding, fixed codes, fast approximations to arithmetic coding, and splay coding are discussed in terms of their speed, memory requirements, and proximity to optimal performance. Recommendations for the best methods of…

Presents two new algorithms for performing arithmetic coding without employing multiplication and discusses their implementation requirements. The first algorithm, suitable for an alphabet of arbitrary size, reduces the worst case excess length to under 0.8%. The second algorithm, suitable only for alphabets of less than 12 symbols, allows even…

Presents an inference algorithm that produces a weighted finite automata (WFA), in particular, the grayness functions of graytone images. Image-data compression results based on the new inference algorithm produces a WFA with a relatively small number of edges. Image-data compression results alone and in combination with wavelets are discussed.…

This study examines whether two frequently reported causes of dyslexia, phonological processing problems and verbal memory impairments, represent a double-deficit or whether they are two expressions of the same deficit. Two-hundred-and-sixty-seven Dutch children aged 10-14 with dyslexia completed a list-learning task and several phonological…

The purpose of this study was to find new evidence for phonological coding in written word recognition among deaf Dutch children. A lexical decision task was presented to 48 severely and profoundly deaf children aged from 6 years 8 months to 13 years 5 months, and a control group of Grade 1 hearing children matched on written word recognition.…

We examined the contribution of semantic similarity to morphological priming effects, using the immediate (Exp. 1 and 3) and the delayed variant (Exp. 2) of picture-word interference. Distractor words were either compounds morphologically related to the picture name, but differing with respect to their semantic transparency (hummingbird, jailbird…

Do 9-month-old infants motorically simulate actions they perceive others perform? Two experiments tested whether action observation, like overt reaching, is sufficient to elicit the Piagetian A-not-B error. Infants recovered a toy hidden at location A or observed an experimenter recover the toy. After the toy was hidden at location B, infants in…

We longitudinally investigated the development of endogenous control of attention in 2 types of tasks that involve competition for attentional focus at 7, 9, and 31 months of age. At all 3 sessions, children participated in a multiple object free play task and a distractibility task. The results revealed both developmental differences and…

This article reports on a research project that explored the manner in which veteran school principals become aware of, and committed to, new perspectives and practices. Personal stories of formative and transformative change from the careers of 23 school principals were collected and analyzed comparatively. Four analytic tools were devised that…

Problem-based learning (PBL) is a pedagogical method that challenges students to think intuitively, learn cooperatively in groups to seek solutions to real world problems. These problems are used as the building blocks to engage students' curiosity and initiate independent learning of subject matter. Authentic, alternative assessment plays a key…

This research evaluates websites from 200 "non-deviant" and 200 "deviant" non-profit organizations to better understand the relationship between the type of advocacy group and the visual imagery used for self-representation. Seventeen of 21 variables measured for this study found no difference between non-deviant and deviant non-profit…

Heejung An describes the pedagogical framework underpinning the design of an interactive Web-based HTML coding tutorial geared for novice learners attending a technical college. The author discusses the ways in which the tutorial was designed to support the learners' initial stages of cognitive skill acquisition. Of primary interest are the three…

There is increased interest by parents in communicating with their children about political violence. However, limited attention in the scholarly literature has focused on parent-child communication about war and terrorism. In response, the purpose of this study is to assess, within their respective ecological contexts, American and Northern Irish…

Through study of 32 students' narratives about coping with external threats to their career goals (e.g., denial of admission to the major of their choice), this study examines the following issues: (a) the coping mechanisms student use when faced with threats that loom large, (b) the relation between coping methods employed and whether the goal is…

Changing perspectives on mathematics teaching and learning resulted in a new generation of mathematics textbooks, stressing among others the importance of mathematical reasoning and problem-solving skills and their application to real-life situations. The article reports a study that investigates to what extent the reform-based ideas underlying…