Miracle-dz/UniFAR-FTUs huggingface dataset:
Analyzing the Roles, Activities, and Skills of Learning Technologists: A Case Study From City University London

This article reports on a case study carried out at City University London into the role of learning technologists. The article examines how the role developed by providing points of comparison with a report on the career development of learning technology staff in UK universities in 2001. This case study identified that learning technologists undertook diverse roles and acquired the skills to work in different communities (professional, academic, and research). It also found that although the core role and activities of learning technologists were similar to findings in 2001, the changing context in which they operated added complexity to the role and impacted the skills and experience required.
Effect of tea catechins on regulation of cell proliferation and antioxidant enzyme expression in H2 O2 -induced primary hepatocytes of goat in vitro.

Tea catechins (TC) are polyphenols that have potent antioxidant activity. The objectives of this study were to determine the effects of TC on antioxidant status of hepatocytes challenged with H2 O2 . Primary hepatocytes of goat were exposed to 1 mm H2 O2 without or with 5, 50 and 500 μg/ml TC. The cells were harvested at 48 h post-treatment to determine effects of TC on proliferation, apoptotic features and membrane integrity of cells, and expression of genes and activities of antioxidant enzymes. H2 O2 exposure caused damage to cells (p < 0.001). A lower concentration of TC (5 μg/ml) displayed a protective effect by inhibiting exorbitant cell proliferation and DNA degradation. Both H2 O2 exposure and TC pre-incubation affected expression of antioxidant enzymes at mRNA and protein levels (p < 0.001). The activities of catalase (CAT) (p = 0.027), CuZn-superoxide dismutase (CuZn-SOD) (p < 0.001) and glutathione peroxidase (GPx) (p < 0.001) increased with TC pre-incubation followed by H2 O2 challenge. Changes of CuZn-SOD activity induced by H2 O2 and TC basically paralleled the changes in the corresponding mRNA and protein levels, but the correlation in CAT and GPx expression displayed slightly different patterns at different concentrations of TC. These findings infer that oxidative stress can induce deleterious cellular responses and this unfavourable condition may be alleviated by treatment with TC.
Social Interactions and Familial Relationships Preservice Science Teachers Describe during Interviews about Their Drawings of the Endocrine and Gastrointestinal Systems.

This study examined preservice science teachers’ understandings of the structure and function of the human gastrointestinal and endocrine systems through drawings and interviews. Moreover, the preservice science teachers described where they thought they learned about the systems. The 142 preservice teachers were asked to draw the human gastrointestinal and endocrine systems and label the organs. Following the in class drawings, the preservice science teachers were interviewed by a classmate about the drawing, the function of the system, and where they believed they learned about the system. The study provided evidence that (1) preservice science teachers had more knowledge of the gastrointestinal system than the endocrine system; (2) the interviews yielded more information about the systems than did the drawings; (3) food was described as moving from the mouth to the anus, but absorption was not often mentioned; and (4) the prior social interactions that influenced the knowledge of the preservice science teachers were different for the gastrointestinal and endocrine systems.
Short, Simple, and Specific: The Influence of Item Design Characteristics in Multi-Source Assessment Contexts

The present study investigates the impact of item characteristics on multi-source performance assessment. Three item characteristics (syntax, double-barreledness, & behavioral specificity) were linked to the psychometric properties of items used by self, subordinates, peers, and supervisors as operationalized by the relationship between the item and the performance dimension it is intended to measure. Results show that syntax, a linguistic index that pertains to the length of items, is related to the psychometric properties of all rating sources except subordinates. The implications of this effect for the design of multi-source assessment instrument are discussed.
Chromosome 9p21 and ABCA1 Genetic Variants and Their Interactions on Coronary Heart Disease and Ischemic Stroke in a Chinese Han Population

The single nucleotide polymorphisms (SNPs) related to both coronary heart disease (CHD) and ischemic stroke (IS) in Chinese individuals have not been identified definitely. This study was developed to evaluate the genetic susceptibility to CHD and IS on the chromosome 9p21 and the adenosine triphosphate (ATP)-binding cassette transporter A1 genes (ABCA1) in a Chinese Han population. Genotypes of the rs1333040, rs1333042, rs4977574, rs2066715 and rs2740483 SNPs were determined in 1134 unrelated patients (CHD, 565 and IS, 569) and 541 controls. The frequencies of the rs4977574 genotypes and alleles between CHD and control groups, and the rs2740483 genotypes and alleles between IS and control groups were different (p = 0.006–0.001). The subjects with rs1333042GG genotype and the carriers of the rs4977574G allele were associated with increased risk of CHD. The carriers of the rs4977574G allele were associated with increased risk of IS. However, the carriers of the rs2740483C allele had lower risk of IS than the non-carriers of the rs2740483C allele after controlling for potential confounders. The rs4977574GG-age (>60 year) interaction increased the risk of CHD (p = 0.022), whereas the rs2740483CG/CC-body mass index (>24 kg/m2) interaction decreased the risk of IS (p = 0.035). The interactions of rs1333040-rs1333042 on the risk of CHD and IS were relatively strong, whereas the interactions of rs1333040-rs1333042-rs2066715 and rs1333040-rs1333042-rs2066715-rs2740483 on the risk of CHD, and rs1333040-rs1333042-rs4977574 and rs1333040-rs1333042-rs4977574-rs2740483 on the risk of IS were relatively weak. These findings suggest that some common variants on the chromosome 9p21 and ABCA1 and their interactions may significantly modify the risk of CHD and IS independent of effects on serum lipid levels.
SCAS: Sensing Channel ASsignment for Spectrum Sensing Using Dedicated Wireless Sensor Networks

Spectrum sensing is essential for the success of the cognitive radio networks. In traditional spectrum sensing schemes, Secondary Users (SUs) are responsible for the spectrum sensing which could be very time and resource consuming. It leads to a great deal of inefficiency in spectrum usage and introduces many practical challenges. To tackle these challenges and leverage the spectrum opportunity more efficiently, we propose a new system that provides a spectrum sensing service for SUs using dedicated wireless spectrum sensor networks (WSSNs). In this paper we focus on the sensing channel assignment problem in WSSNs and formulate the problem as a Sensing Effectiveness Maximization Problem (SEMP). We prove that SEMP is NP-complete under the ideal case, and show that the more challenges arises in real environments. To address the issues, we systematically study the design tradeoff and critical factors when maximizing the sensing effectiveness. Based on these study results we propose a Sensing Channel Assignment algorithm (SCAS). We conduct test-bed empirical investigations as well as comprehensive simulations. Performance evaluation results show that for both the scenarios of given deployments and manual deployments, SCAS is able to sense more channels to improve the sensing effectiveness. The improvement is up to 300% and the average improvement is 150% compared with other simple alternatives.
Transforming Science Learning and Student Participation in Sixth Grade Science: A Case Study of a Low-Income, Urban, Racial Minority Classroom

Recent criticisms of the goal of “science for all” with regard to minority students have alluded to the onerous culture of school science characterized by white, middle-class values that eschew personal everyday science experiences and nontraditional funds of knowledge, in addition to alienating science instruction. Using critically-oriented, sociocultural perspectives, this article explores the sixth grade classroom of a male, white, science teacher in an urban school that serves only minority students. Using Holland, Lachicotte, Skinner, and Cain's (2001) notion of figured worlds, we look at what learning science looks like in Mr. M's classroom and how he provides the structural support to increase student participation by creating different figured worlds of sixth grade science. In these different figured worlds, we discuss the pedagogical strategies Mr. M uses to purposefully recruit nontraditional funds of knowledge of racial minority and low-income students, thereby positioning them with more authority for participation. Through this case study of Mr. M and the racial minority and low-income students he teaches, we discuss the role science teachers play in urban school science education and the agency and achievement racial minority and low-income students are capable of with appropriate support.
Strength and weakness in four coalition situations

This study tested four models of coalition behavior in decision making on systems at the group level, in four different games, each of which was played by five individuals. Each game established a different distribution of power among the players. Data for coalition frequencies and for the payoffs of the players when they were included in a particular coalition supported Komorita & Chertkoff s (1973) bargaining theory over Komorita's (1974) weighted probability model and Gamson's (1961) minimum resource theory. When the overall payoffs received by each of the players in each game were used as a measure of the player's success in bargaining, the predictions of the Roth-Shipley and the weighted probability models received mixed support. Finally, the results suggested when the “strength is weakness” phenomenon might be expected to occur. Players with equal Shapley values but different resources within a particular game supported “strength is weakness. ” Players with different Shapley values supported a “strength is strength” conclusion. Reports of the players provided a possible explanation of the underlying causes of this phenomenon.
A cross-sectional comparison of routinized and compulsive-like behaviours in typical children aged from 2 to 11 years

Routinized and compulsive like behaviours (RCBs) have been described as important aspects of development seen universally in children, yet investigation is relatively scarce. One exception was the development of the Childhood Routines Inventory (CRI), which has prompted recent studies. The present study was a replication of the standardization for the CRI on a British sample and with an extended age range. It also explored possible associations with obsessive-compulsive disorder (OCD). The parents of 1,369 children (aged 2–11 years) completed the CRI, and an 8-item OCD scale for those 7 years and over. Socioeconomic status (SES) was measured by proxy post codes; 111 parents completed the questionnaire twice. The CRI had good internal consistency and test–retest reliability. There was a significant linear decline in RCBs with age; a minority of children continued to have high levels up to 11 years of age. Children designated at risk for OCD had higher CRI scores. Anxious behaviours reported by parents of children aged 7 years or over were associated with higher levels of RCBs. Factor analysis of the CRI identified three factors: “Repetitive”, “Just Right” and “Sensitivity”.
Gallium–Indium–Zinc-Oxide-Based Thin-Film Transistors: Influence of the Source/Drain Material

During the last years, oxide semiconductors have shown that they will have a key role in the future of electronics. In fact, several research groups have already presented working devices with remarkable electrical and optical properties based on these materials, mainly thin-film transistors (TFTs). Most of these TFTs use indium-tin oxide (ITO) as the material for source/drain electrodes. This paper focuses on the investigation of different materials to replace ITO in inverted-staggered TFTs based on gallium-indium-zinc oxide (GIZO) semiconductor. The analyzed electrode materials were indium-zinc oxide, Ti, Al, Mo, and Ti/Au, with each of these materials used in two different kinds of devices: one was annealed after GIZO channel deposition but prior to source/drain deposition, and the other was annealed at the end of device production. The results show an improvement on the electrical properties when the annealing is performed at the end (for instance, with Ti/Au electrodes, mobility rises from 19 to 25 cm2/V ldr s, and turn-on voltage drops from 4 to 2 V). Using time-of-flight secondary ion mass spectrometry (TOF-SIMS), we could confirm that some diffusion exists in the source/drain electrodes/semiconductor interface, which is in close agreement with the obtained electrical properties. In addition to TOF-SIMS results for relevant elements, electrical characterization is presented for each kind of device, including the extraction of source/drain series resistances and TFT intrinsic parameters, such as (intrinsic mobility) and VTi (intrinsic threshold voltage).
Universal rateless codes from coupled LT codes

It was recently shown that spatial coupling of individual low-density parity-check codes improves the belief-propagation threshold of the coupled ensemble essentially to the maximum a posteriori threshold of the underlying ensemble. We study the performance of spatially coupled low-density generator-matrix ensembles when used for transmission over binary-input memoryless output-symmetric channels. We show by means of density evolution that the threshold saturation phenomenon also takes place in this setting. Our motivation for studying low-density generator-matrix codes is that they can easily be converted into rateless codes. Although there are already several classes of excellent rateless codes known to date, rateless codes constructed via spatial coupling might offer some additional advantages. In particular, by the very nature of the threshold phenomenon one expects that codes constructed on this principle can be made to be universal, i.e., a single construction can uniformly approach capacity over the class of binary-input memoryless output-symmetric channels. We discuss some necessary conditions on the degree distribution which universal rateless codes based on the threshold phenomenon have to fulfill. We then show by means of density evolution and some simulation results that indeed codes constructed in this way perform very well over a whole range of channel types and channel conditions.
Noise Constrained Data-Reusing Adaptive Algorithms for System Identification

We present a new framework of the data-reusing (DR) adaptive algorithms by incorporating a constraint on noise, referred to as a noise constraint. The motivation behind this work is that the use of the statistical knowledge of the channel noise can contribute toward improving the convergence performance of an adaptive filter in identifying a noisy linear finite impulse response (FIR) channel. By incorporating the noise constraint into the cost function of the DR adaptive algorithms, the noise constrained DR (NC-DR) adaptive algorithms are derived. Experimental results clearly indicate their superior performance over the conventional DR ones. key words: adaptive filter, data-reusing, least-mean square (LMS), affine projection (AP), noise constraint
Reforming Again, Again, and Again

Why do reforms return again and again? To illustrate that the question is valid, I offer three examples drawn from instructional, curricular, and governance planned changes that have returned more than once. To answer the question, I first examine the dominant explanation presented by researchers and policymakers: the lack of rationality in proposing and implementing planned change. I explore why the dominant explanation is flawed in its frequently used metaphors and analysis. I then offer alternative explanations for recurring reforms—a political and an institutional perspective harnessed together—to explain the puzzle of why reforms return. The point of this analysis is to enlarge the repertoire of explanations that researchers and policymakers use to examine potential and past reforms. The policymaking stakes run high for expanding the range of explanations because the questions of why reforms failed in the past and why they return go to the heart of present policy debates over whether federal, state, and district mandates to alter schooling will get past the classroom door.
Development of a 63K SNP Array for Cotton and High-Density Mapping of Intraspecific and Interspecific Populations of Gossypium spp.

High-throughput genotyping arrays provide a standardized resource for plant breeding communities that are useful for a breadth of applications including high-density genetic mapping, genome-wide association studies (GWAS), genomic selection (GS), complex trait dissection, and studying patterns of genomic diversity among cultivars and wild accessions. We have developed the CottonSNP63K, an Illumina Infinium array containing assays for 45,104 putative intraspecific single nucleotide polymorphism (SNP) markers for use within the cultivated cotton species Gossypium hirsutum L. and 17,954 putative interspecific SNP markers for use with crosses of other cotton species with G. hirsutum. The SNPs on the array were developed from 13 different discovery sets that represent a diverse range of G. hirsutum germplasm and five other species: G. barbadense L. , G. tomentosum Nuttal × Seemann, G. mustelinum Miers × Watt, G. armourianum Kearny, and G. longicalyx J.B. Hutchinson and Lee. The array was validated with 1,156 samples to generate cluster positions to facilitate automated analysis of 38,822 polymorphic markers. Two high-density genetic maps containing a total of 22,829 SNPs were generated for two F2 mapping populations, one intraspecific and one interspecific, and 3,533 SNP markers were co-occurring in both maps. The produced intraspecific genetic map is the first saturated map that associates into 26 linkage groups corresponding to the number of cotton chromosomes for a cross between two G. hirsutum lines. The linkage maps were shown to have high levels of collinearity to the JGI G. raimondii Ulbrich reference genome sequence. The CottonSNP63K array, cluster file and associated marker sequences constitute a major new resource for the global cotton research community.
Attitude Control of a Quadrotor Using Model Free Based Sliding Model Controller

In this paper, a model free based sliding mode control (MFSMC) is developed to realize the attitude control of a quadrotor whose model contains the system uncertainties and external disturbances. Firstly, a model free based intelligent PD controller (iPD) which contains time-delay estimation is designed. The problem is that although the proposed design of the controller does not need to know the system model, but it exists the unknown dynamics estimation error. Then for the considered problem, the MFSMC is proposed. This referred controller which consists of three parts: the equivalent control law, exponent reaching law and correction control law, ensures the trajectories tracking. Finally, the proposed MFSMC method is validated on the quadrotor with system uncertainties and external disturbances and compared with classic PD and iPD control. The corresponding simulation results demonstrate the effectiveness and performance of the MFSMC controller against the controllers of iPD and PD.
Promoting pedagogical content knowledge development for early career secondary teachers in science and technology using content representations

Background: This research addressed the key area of early career teacher education and aimed to explore the use of a ‘content representation’ (CoRe) as a mediational tool to develop early career secondary teacher pedagogical content knowledge (PCK). This study was situated in the subject areas of science and technology, where sound teacher knowledge is particularly important to student engagement. Purpose: The study was designed to examine whether such a tool (a CoRe), co-designed by an early career secondary teacher with expert content and pedagogy specialists, can enhance the PCK of early career teachers. The research questions were: How can experts in content and pedagogy work together with early career teachers to develop one science topic CoRe and one technology topic CoRe to support the development of PCK for early career secondary teachers? How does the use of a collaboratively designed CoRe affect the planning of an early career secondary teacher in science or technology? How has engagement in the development and use of an expert-informed CoRe developed an early career teacher’s PCK? Sample: The research design incorporated a unique partnership between two expert classroom teachers, two content experts, four early career teachers, and four researchers experienced in science and technology education. Design: This study employed an interpretivist-based methodology and an action research approach within a four-case study design. Data were gathered using qualitative research methods focused on semi-structured interviews, observations and document analysis. Results: The study indicated that CoRes, developed through this collaborative process, helped the early career teachers focus on the big picture of the topic, emphasize particularly relevant areas of content and consider alternative ways of planning for their teaching. Conclusions: This paper presents an analysis of the process of CoRe development by the teacher–expert partnerships and the effect that had on the early career teachers’ PCK. In addition, as the same tools and methodology were applied to both a science and a technology teaching context, differences between the two learning areas are discussed.
The Social Context of Social Comparison

Research on social comparison has largely ignored the social context in which opinion evaluation may occur. In the present study, subject groups were initially exposed to descriptions of a target issue that emphasized the importance of either informational considerations (facts) or value judgments. Evaluation of the issue and formulation of an issue opinion were defined as either an individual or a group goal. After announcing their own position on the issue, subjects indicated their preference for including in the group a deviant member whose issue position differed from the others' The results revealed that subjects in the group goal condition were more rejecting of the deviant than those in the individual goal condition. This difference was due largely to subjects who perceived the issue in informational terms. The implications of these findings for opinion evaluation as a collective enterprise were discussed.
Persuading Visual Attention through Geometry

Artists, illustrators, photographers, and cinematographers have long used the principles of contrast and composition to guide visual attention. In this paper, we introduce geometry modification as a tool to persuasively direct visual attention. We build upon recent advances in mesh saliency to develop techniques to alter geometry to elicit greater visual attention. Eye-tracking-based user studies show that our approach successfully guides user attention in a statistically significant manner. Our approach operates directly on geometry and, therefore, produces view-independent results that can be used with existing view-dependent techniques of visual persuasion.