Aircraft cockpit vision: Math model

A mathematical model was developed to describe the field of vision of a pilot seated in an aircraft. Given the position and orientation of the aircraft, along with the geometrical configuration of its windows, and the location of an object, the model determines whether the object would be within the pilot's external vision envelope provided by the aircraft's windows. The computer program using this model was implemented and is described

Landau-Khalatnikov-Fradkin Transformations and the Fermion Propagator in Quantum Electrodynamics

We study the gauge covariance of the massive fermion propagator in three as well as four dimensional Quantum Electrodynamics (QED). Starting from its value at the lowest order in perturbation theory, we evaluate a non-perturbative expression for it by means of its Landau-Khalatnikov-Fradkin (LKF) transformation. We compare the perturbative expansion of our findings with the known one loop results and observe perfect agreement upto a gauge parameter independent term, a difference permitted by the structure of the LKF transformations.Comment: 9 pages, no figures, uses revte

Impact of Tandem Repeats on the Scaling of Nucleotide Sequences

Techniques such as detrended fluctuation analysis (DFA) and its extensions have been widely used to determine the nature of scaling in nucleotide sequences. In this brief communication we show that tandem repeats which are ubiquitous in nucleotide sequences can prevent reliable estimation of possible long-range correlations. Therefore, it is important to investigate the presence of tandem repeats prior to scaling exponent estimation.Comment: 14 Pages, 3 Figure

Gauge Dependence of Mass and Condensate in Chirally Asymmetric Phase of Quenched QED3

We study three dimensional quenched Quantum Electrodynamics in the bare vertex approximation. We investigate the gauge dependence of the dynamically generated Euclidean mass of the fermion and the chiral condensate for a wide range of values of the covariant gauge parameter $\xi$. We find that (i) away from $\xi=0$, gauge dependence of the said quantities is considerably reduced without resorting to sophisticated vertex {\em ansatze}, (ii) wavefunction renormalization plays an important role in restoring gauge invariance and (iii) the Ward-Green-Takahashi identity seems to increase the gauge dependence when used in conjunction with some simplifying assumptions. In the Landau gauge, we also verify that our results are in agreement with those based upon dimensional regularization scheme within the numerical accuracy available.Comment: 14 pages, 11 figures, uses revte

Requirement Model For Mobile Bus Rental And Reservation Application

The main objectives of this study are to design a bus rental and reservation system for searching the availability of bus, the price of bus rental, and reserve the bus, to develop a system of the Bus Rental and Reservation System. The design is tested on the prototype and evaluated to test the usability and acceptability of the system. The Wireless Application Protocol (WAP) technologies have been used in this application has enable users to make booking through mobile telephones

Resource Aware Sensor Nodes in Wireless Sensor Networks

Wireless sensor networks are continuing to receive considerable research interest due, in part, to the range of possible applications. One of the greatest challenges facing researchers is in overcoming the limited network lifetime inherent in the small locally powered sensor nodes. In this paper, we propose IDEALS, a system to manage a wireless sensor network using a combination of information management, energy harvesting and energy monitoring, which we label resource awareness. Through this, IDEALS is able to extend the network lifetime for important messages, by controlling the degradation of the network to maximise information throughput

Energy managed reporting for wireless sensor networks

In this paper, we propose a technique to extend the network lifetime of a wireless sensor network, whereby each sensor node decides its individual network involvement based on its own energy resources and the information contained in each packet. The information content is ascertained through a system of rules describing prospective events in the sensed environment, and how important such events are. While the packets deemed most important are propagated by all sensor nodes, low importance packets are handled by only the nodes with high energy reserves. Results obtained from simulations depicting a wireless sensor network used to monitor pump temperature in an industrial environment have shown that a considerable increase in the network lifetime and network connectivity can be obtained. The results also show that when coupled with a form of energy harvesting, our technique can enable perpetual network operatio

PHARMACOGENETIC VARIATIONS RELATED TO CLOPIDOGREL RESISTANCE AND ITS CLINICAL IMPLICATIONS: AN ISSUE WHICH REMAINS LARGELY UNADDRESSED

Objectives: Antiplatelet therapy with either clopidogrel alone or in combination with aspirin is the mainstay prophylactic drug therapy followingpercutaneous coronary intervention and long-term prevention of cardiovascular and cerebrovascular events. Non-responders/semi-responders to clopidogrel are reported to have increased incidences of adverse outcomes like recurrent ischemic attacks. Variability in response to clopidogrel ismore common among Asians, and it is as high as 70% in some of the Asian communities. Researchers attribute inter-individual variations in responseto clopidogrel to various pharmacogenetic determinants. Polymorphisms of multidrug resistance protein 1, CYP2C19 and its alleles, P2Y adenosine diphosphate (ADP) receptor are concluded to be specific to clopidogrel resistance in Indian population.Methods: A thorough literature search was done use different keywords such as clopidogrel resistance, pharmacogenomics, pharmacogeneticvariability, and ethnic variability from database sources such as Google Scholar, Medline, PubMed Central, and Scopus.Results and Conclusion: Literature revealed a disparity between various pharmacogenetic determinants of clopidogrel resistance, particularly inthe Asian population. Few studies suggest that there is no significant association between clopidogrel response variability and ADP receptor P2Yand P2Y gene polymorphisms. Variation in the cytochrome P450 2C19 (CYP2C19) gene coding for the CYP2C19 enzyme, involved in metabolism and conversion of the clopidogrel to active metabolites is considered one of the major determinants of clopidogrel resistance in some populations. Pooled data from various studies suggest that variability in clopidogrel response cannot be attributed to a single gene polymorphism and is thought to be multifactorial. However, disparity in the data related to the specific gene polymorphisms responsible for the encountered clopidogrel resistance necessitates the further evaluation of genome. 12Keywords: Clopidogrel, Clopidogrel resistance, Single gene polymorphisms, Inter-individual variability. 1 , and P2Y 12