Fostering the Development of Logico-Mathematical Thinking in a Card Game at Ages 5-6

A class of 14 kindergartners in Japan was videotaped while playing a card game in groups of three involving the placement of cards in numerical order. The children were followed up in first grade, and it was found that development in one area of logico-mathematical knowledge (for example, the making of temporal relationships) stimulates development in other areas (such as classification and numerical reasoning). This specific, interrelated mode of structuring was not expected and suggested that it is unwise for adults to try to plan a sequence of development. The implication of the findings is that it may be better to provide "natural" play activities that encourage children to think logico-mathematically than to conceptualize specific standards for 3-to-6-year-olds' mathematics education.     

Developmental Differences in Decoding the Meanings of the Appraisal Actions of Teachers

Teachers convey evaluations through such "appraisal actions" as ability versus effort attributions for children's performance, spontaneous displays of warmth versus matter-of-fact acceptance, and attention versus inattention. Some appraisal actions (e.g., ability-effort) require an understanding of multiplicative relations to arrive at an "adult" interpretation. Others (e.g., attention-inattention) do not. First through sixth graders watched videotaped scenes in which teachers attributed one child's performance to ability but chided another for lack of effort even though he had given an equivalent performance, hugged one child but not another for equivalent performance, and paid attention to one child's oral report but not another's. Younger students (ages 5-9 to 7-10) rated the ability-attributed and hugged children as smarter; older students (ages 9-9 to 11-10) rated the effort-attributed and unhugged children as smarter. In contrast, no age differences were found in decoding attention versus inattention. The results suggest that younger children use a different strategy in decoding the meanings of complex appraisal actions.     

Differentials of a State Reading Assessment: Item Functioning, Distractor Functioning, and Omission Frequency for Disability Categories

Large data sets from a state reading assessment for third and fifth graders were analyzed to examine differential item functioning (DIF), differential distractor functioning (DDF), and differential omission frequency (DOF) between students with particular categories of disabilities (speech/language impairments, learning disabilities, and emotional behavior disorders) and students without disabilities. Multinomial logistic regression was employed to compare response characteristic curves (RCCs) of individual test items. Although no evidence for serious test bias was found for the state assessment examined in this study, the results indicated that students in different disability categories showed different patterns of DIF, DDF, and DOF, and that the use of RCCs helps clarify the implications of DIF and DDF.     

When do people use query suggestion? A query suggestion log analysis

Query suggestion, which enables the user to revise a query with a single click, has become one of the most fundamental features of Web search engines. However, it has not been clear what circumstances cause the user to turn to query suggestion. In order to investigate when and how the user uses query suggestion, we analyzed three kinds of data sets obtained from a major commercial Web search engine, comprising approximately 126 million unique queries, 876 million query suggestions and 306 million action patterns of users. Our analysis shows that query suggestions are often used (1) when the original query is a rare query, (2) when the original query is a single-term query, (3) when query suggestions are unambiguous, (4) when query suggestions are generalizations or error corrections of the original query, and (5) after the user has clicked on several URLs in the first search result page. Our results suggest that search engines should provide better assistance especially when rare or single-term queries are input, and that they should dynamically provide query suggestions according to the searcher’s current state.     

Information and Communication Technologies for Development: The Bottom of the Pyramid Model in Practice

The currently influential model for information and communication technologies for development (ICT4D) is based on increasing the well-being of the poor through market-based solutions, and by using low-cost but advanced technologies. Using ethnographic methods, we chart out the contradictions that could arise when such a development-through-entrepreneurship model is implemented. We examine the Akshaya project, a franchise of computer-service kiosks in Kerala, India, which strives simultaneously for social development through access to computers and financial viability through cost recovery and entrepreneurship. We show that tensions within the state and among entrepreneurs and perceptions of public versus private among consumers make it challenging to meet the twin goals of commercial profitability and social development.     

Improved krill herd algorithm based sliding mode MPPT controller for variable step size P&O method in PV system under simultaneous change of irradiance and temperature

In recent years, Photovoltaic (PV) systems have been received great attention all over the words as they are sustainable, unlimited and environmentally friendly energy. However, it is required for the PV system to apply a tracking controller to guarantee efficient operation by extracting the maximum power, which named maximum power point tracking (MPPT) method. Due to the simple structure, the conventional perturb and observe (P&O) MPPT algorithm is very popular in the literature. Nevertheless, conventional methods show inaccurate performance, particularly when high variations occur in irradiance, resulting in fluctuations around the MPP. To deal with these challenges, a novel technique on the basis of the variable-step size of P&O MPPT and sliding mode controller (SMC) adjusted by the θ-modified krill herd (θ-MKH) algorithm is presented. The θ-MKH algorithm is utilized to fine-tune the optimal SMC parameters to drive the variable step of the classical P&O algorithm. Simulations are prepared to compare the performance of the suggested scheme with conventional methods by considering simultaneous fast changes of irradiance and temperature. The results show that the suggested scheme have proper performance in both transient and steady-state, particularly under quickly varying climate circumstances.     

Differential exposure to early childhood education services and mother–toddler interaction

This study examined the associations of exposure to early childhood education (ECE) services upon 2.5-year-old children's task persistence and enthusiasm and their mothers’ authoritative and authoritarian behavior and support stimulation. Families participated in the Infant Health and Development Program, an eight-site randomized comprehensive ECE to enhance the development of low birth weight, premature infants. Exposure was measured for 269 families who received at least one home visit and 1 day at the Child Development Center (CDC): 131 with lower exposure (64 ± 11.6 home visits and 206 ± 53 CDC days) and 138 with higher exposure (67 ± 9.2 home visits and 301 ± 21 CDC days). These two groups were compared to the follow-up group (540 with no exposure). Compared to no exposure, high exposure was associated with greater child enthusiasm and persistence and maternal support stimulation. Infant and mother test scores and temperament/depression scores, child's sex, and ethnicity were examined as moderators. Compared to no exposure, high exposure was related to maternal authoritative behavior toward girls, less authoritarian behavior for mothers with lower PPVT scores, and greater task enthusiasm from Black children.     

Early effects of oral administration of omeprazole and roxatidine on intragastric pH

Objective

The ideal medication for the treatment of acid-related diseases, e.g., peptic ulcers, stress-related gastric bleeding, functional dyspepsia, and gastroesophageal reflux disease, should have a rapid onset of action to promote hemostasis and relieve the symptoms. The aim of our study was to investigate the inhibitory effects on gastric acid secretion of a single oral administration of a proton pump inhibitor, omeprazole 20 mg, and an H₂-receptor antagonist, roxatidine 75 mg.

Methods

Ten Helicobacter pylori-negative male subjects participated in this randomized, two-way crossover study. Intragastric pH was monitored continuously for 6 h after single oral administration of omeprazole 20 mg and roxatidine 75 mg. Each administration was separated by a 7-d washout period.

Results

During the 6-h study period, the average pH after administration of roxatidine was higher than that after administration of omeprazole (median: 4.45 vs. 2.65; P=0.0367). Also during the 6-h study period, a longer duration of maintenance at pH above 2, 5, and 6 was observed after administration of roxatidine 75 mg than after administration of omeprazole 20 mg (median: 90.6% vs. 55.2%, P=0.0284; 43.7% vs. 10.6%, P=0.0125; 40.3% vs. 3.3%, P=0.0125; respectively).

Conclusions

In Helicobacter pylori-negative healthy male subjects, oral administration of roxatidine 75 mg increased the intragastric pH more rapidly than that of omeprazole 20 mg.