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Journal Cover International Journal of Advanced Mathematical Sciences
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  This is an Open Access Journal Open Access journal
   ISSN (Print) 2307-454X - ISSN (Online) 2307-454X
   Published by Science Publishing Corporation Homepage  [13 journals]
  • Missing observations: The loss in relative A-, D- and G-efficiency

    • Authors: Mary Iwundu
      Pages: 43 - 49
      Abstract: The loss in Relative A-, D- and G-efficiency due to missing single or multiple observations is studied using cuboidal designs associated with response models. Higher losses in Relative A- and D-efficiencies are attributed to missing vertex points. The absence of one or two center points does not affect any of Relative A-, D- and G-efficiency, but when its absence is in combination with either a vertex or axial point, there is some negative effect on the design efficiency resulting in some percentage loss in Relative efficiency. The loss in relative efficiency is higher when the missing center point is in combination with missing vertex point. Losses in Relative A- and D-efficiencies are generally higher than losses in Relative G-efficiency. In fact, Relative G-efficiency is mildly affected by the missing vertex or axial point or both.
      PubDate: 2017-06-29
      DOI: 10.14419/ijams.v5i2.7786
      Issue No: Vol. 5, No. 2 (2017)
  • Globally exponential synchronization criterion of chaot-ic oscillators
           using active control

    • Authors: Israr Ahmad, Sharifa Al Mahrouqi, Mohammad Shahzad
      Pages: 50 - 56
      Abstract: This research paper focuses the globally exponential synchronization between two identical and two nonidentical chaotic oscillators. With the help of Lyapunov direct method and using the active control technique, suitable algebraic conditions are obtained analytically that establish the globally exponential synchronization. The proposed globally exponential synchronization criterion is more general and much less conservative than the previously published works. A comparison, based upon the synchronization speed, cost and quality have been performed with our study of the previously published results. The effect of unknown external disturbances has also been discussed. Numerical simulation results are presented to illustrate the performance and efficiency of this study.
      PubDate: 2017-11-10
      DOI: 10.14419/ijams.v5i2.7770
      Issue No: Vol. 5, No. 2 (2017)
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