2,363 research outputs found
Simple Floating Voltage-Controlled Memductor Emulator for Analog Applications
The topic of memristive circuits is a novel topic in circuit theory that has become of great importance due to its unique behavior which is useful in different applications. But since there is a lack of memristor samples, a memristor emulator is used instead of a solid state memristor. In this paper, a new simple floating voltage-controlled memductor emulator is introduced which is implemented using commercial off the shelf (COTS) realization. The mathematical modeling of the proposed circuit is derived to match the theoretical model. The proposed circuit is tested experimentally using different excitation signals such as sinusoidal, square, and triangular waves showing an excellent matching with previously reported simulations
Human Active Learning
Active machine learning (AML) is a popular research area in machine learning. It allows selection of the most informative instances in training data of the domain for manual labeling. AML aims to produce a highly accurate classifier using as few labeled instances as possible, thereby minimizing the cost of obtaining labeled data. As machines can learn from experience like humans do, using AML for human category learning may help human learning become more efficient and hence reduce the cost of teaching. This chapter is a review of recent research literature concerning the use of AML technique to enhance human learning and teaching. There are a few studies on the applications of AML to the human category learning domain. The most interesting study was by Castro et al., which showed that humans learn faster with better performance when they can actively select the informative instances from a pool of unlabeled data instead of random sampling. Although AML can facilitate object categorization for humans, there are still many challenges and questions that need to be addressed in the use of AML for modeling human categorization. In this chapter, we will discuss some of these challenges
Non-Universality in Semi-Directed Barabasi-Albert Networks
In usual scale-free networks of Barabasi-Albert type, a newly added node
selects randomly m neighbors from the already existing network nodes,
proportionally to the number of links these had before. Then the number N(k) of
nodes with k links each decays as 1/k^gamma where gamma=3 is universal, i.e.
independent of m. Now we use a limited directedness in the construction of the
network, as a result of which the exponent gamma decreases from 3 to 2 for
increasing m.Comment: 5 pages including 2 figures and computer progra
DESTRUCTION OF CONIFER SEED AND METHODS OF PROTECTION
ABSTRACT: Agents responsible for tosses of conifer seed and methods for seed protection are reviewed. Published information indicates that much seed is destroyed, especially by seed-eating rodents and birds. Improvement of existing protective methods and development of new chemical means are necessary to overcome the problem
Simulation of Demographic Change in Palestinian Territories
Mortality, birth rates and retirement play a major role in demographic
changes. In most cases, mortality rates decreased in the past century without
noticeable decrease in fertility rates, this leads to a significant increase in
population growth. In many poor countries like Palestinian territories the
number of births has fallen and the life expectancy increased.
In this article we concentrate on measuring, analyzing and extrapolating the
age structure in Palestine a few decades ago into future. A Fortran program has
been designed and used for the simulation and analysis of our statistical data.
This study of demographic change in Palestine has shown that Palestinians will
have in future problems as the strongest age cohorts are the above-60-year
olds. We therefore recommend the increase of both the retirement age and women
employment.Comment: For Int. J. Mod. Phys. C 18, issue 11; 9 pages including figures and
progra
Highly Nonlinear Ising Model and Social Segregation
The usual interaction energy of the random field Ising model in statistical
physics is modified by complementing the random field by added to the energy of
the usual Ising model a nonlinear term S^n were S is the sum of the neighbor
spins, and n=0,1,3,5,7,9,11. Within the Schelling model of urban segregation,
this modification corresponds to housing prices depending on the immediate
neighborhood. Simulations at different temperatures, lattice size, magnetic
field, number of neighbors and different time intervals showed that results for
all n are similar, expect for n=3 in violation of the universality principle
and the law of corresponding states. In order to find the critical
temperatures, for large n we no longer start with all spins parallel but
instead with a random configuration, in order to facilitate spin flips.
However, in all cases we have a Curie temperature with phase separation or
long-range segregation only below this Curie temperature, and it is
approximated by a simple formula: Tc is proportional to 1+m for n=1, while Tc
is roughly proportional to m for n >> 1.Comment: 10 pages including many figure
The Impact of Face-to-Face Orientation on Online Retention: A Pilot Study
Student retention in online education is a concern for students, faculty and administration. Retention rates are 20% lower in online courses than in traditional face-to-face courses. As part of an integration and engagement strategy, a face-to-face orientation was added to an online undergraduate business information systems course to examine its impact on retention. The study methodology consisted of an early email contact, distribution of course documents, a follow-up phone call, and a pre-course face-to-face orientation. The retention rate of students who attended the orientation was over 91% with a p-value of 0.9143. The retention rate of students not attending the orientation was just under 18%. Findings suggest that face-to-face orientations impact retention positively
Course Revitalization As A Change Driver Throughout Undergraduate Business Curriculum
This paper describes the revitalization of Business Information Systems and Communication, a high enrollment, prerequisite course for all undergraduate business students in the Coles College of Business. An overview of the course components is presented and original structure described. The rationale for change, technologies leveraged and measures of success are presented. The change drivers are identified and their impact on undergraduate curriculum delineated. Lessons learned and future implications are discussed
Strong association between a single gene and fertilization efficiency of males and fecundity of their mates in the bulb mite.
Although variation in male fertilization efficiency has been shown to have a genetic basis in several species, the genes responsible for the effect are generally unknown. Here, we show a strong association between the fertilization success of males and their phosphogluconate dehydrogenase (Pgdh) genotype in the bulb mite Rhizoglyphus robini. Males homozygous for the slow (S) allele fathered a significantly greater proportion of offspring when competing with males homozygous for the fast (F) allele. There was no evidence that female fecundity was influenced by their Pgdh genotype. The fecundity of FF females did not differ significantly from the fecundity of SS females but female fecundity was significantly influenced by the genotype of their mate. Females paired with SS males laid significantly fewer eggs than females paired with FF males. Altogether these data show a trade-off, with the male SS genotype associated with their higher fertilization efficiency but at the cost of a negative impact on the fecundity of females mating with them
Effect of inbreeding and heritability of sperm competition success in the bulb mite Rhizoglyphus robini
Sperm competition is a potent evolutionary force shaping the reproductive biology of most animal species. Here, we estimated the heritability of sperm competition success in the promiscuous bulb mite Rhizoglyphus robini. Sperm competition success was measured with the sterile male technique as the proportion of eggs fertilised by the second of three males mated with a single female. Sperm competition success responded significantly to selection. The heritability estimated from the response to five generations of selection was 0.13. We also estimated the effect of inbreeding on sperm competition success. Males produced by sib-mating (F=0.25) had a significantly lower sperm competition success than outbred males. The estimated coefficient of inbreeding depression was 0.53. Such high inbreeding depression together with moderately low heritability is consistent with the view that sperm competitive ability is under strong directional selection and strongly influences the reproductive success of males
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