International Journal of Systems Science and Applied Mathematics

Volume 6, Issue 2, June 2021

  • Optimal Sequential Third Order Rotatable Designs in Three, Four and Five Dimensions

    Nyakundi Omwando Cornelious, Evans Mbuthi Kilonzo

    Issue: Volume 6, Issue 2, June 2021
    Pages: 35-39
    Received: Apr. 06, 2021
    Accepted: Apr. 19, 2021
    Published: Apr. 29, 2021
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    Abstract: Response surface methodology (RSM) is a statistical technique used to evaluate the relationship between multiple input variables and one or more response variables with the aim of optimizing the response variables. Sequential experiments are very economical and useful in practice. Therefore, rotatable designs such as the third order rotatable desig... Show More
  • Global Existence of a Virus Infection Model with Saturated Chemotaxis

    Ruijing Li

    Issue: Volume 6, Issue 2, June 2021
    Pages: 40-54
    Received: Apr. 26, 2021
    Accepted: May 11, 2021
    Published: May 27, 2021
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    Abstract: In this paper, a virus infection model with saturated chemotaxis is formulated and analyzed, where the chemotactic sensitivity for chemotactic movements of the cells is described. This model contains three state variables namely the population density of uninfected cells, the population density of infected cells and the concentration of virus parti... Show More
  • Electrostatic and Dynamic Analysis of P+PNP Double Junction Type and P+PNPN Triple Junction Type Pinned Photodiodes

    Yoshiaki Hagiwara

    Issue: Volume 6, Issue 2, June 2021
    Pages: 55-76
    Received: May 28, 2021
    Accepted: Jun. 10, 2021
    Published: Jun. 16, 2021
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    Abstract: This paper explains the device structure and operation of image sensors and solar cells. Both are semiconductor devices operating with the same physical principle of detecting photons. A high efficiency of the photon to electron energy conversion is very much desired in both devices. Image sensors now use a very advanced and scaled down CMOS fabric... Show More