http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Presentation of Malaria Epidemics Using Multiple Optimal Controls
Lashari, Abid Ali,Aly, Shaban,Hattaf, Khalid,Zaman, Gul,Jung, Il Hyo,Li, Xue-Zhi Hindawi Limited 2012 Journal of applied mathematics (JAM) Vol.2012 No.-
<P>An existing model is extended to assess the impact of some antimalaria control measures, by re-formulating the model as an optimal control problem. This paper investigates the fundamental role of three type of controls, personal protection, treatment, and mosquito reduction strategies in controlling the malaria. We work in the nonlinear optimal control framework. The existence and the uniqueness results of the solution are discussed. A characterization of the optimal control via adjoint variables is established. The optimality system is solved numerically by a competitive Gauss-Seidel-like implicit difference method. Finally, numerical simulations of the optimal control problem, using a set of reasonable parameter values, are carried out to investigate the effectiveness of the proposed control measures.</P>
Lashari, Abid Ali,Lee, Kwang Sung Korean Mathematical Society 2017 대한수학회지 Vol.54 No.3
A deterministic model for the spread of pine wilt disease with asymptomatic carrier trees in the host pine population is designed and rigorously analyzed. We have taken four different classes for the trees, namely susceptible, exposed, asymptomatic carrier and infected, and two different classes for the vector population, namely susceptible and infected. A complete global analysis of the model is given, which reveals that the global dynamics of the disease is completely determined by the associated basic reproduction number, denoted by $\mathcal{R}_0$. If $\mathcal{R}_0$ is less than one, the disease-free equilibrium is globally asymptotically stable, and in such a case, the endemic equilibrium does not exist. If $\mathcal{R}_0$ is greater than one, the disease persists and the unique endemic equilibrium is globally asymptotically stable.
Abid Ali Lashari,이광성 대한수학회 2017 대한수학회지 Vol.54 No.3
A deterministic model for the spread of pine wilt disease with asymptomatic carrier trees in the host pine population is designed and rigorously analyzed. We have taken four different classes for the trees, namely susceptible, exposed, asymptomatic carrier and infected, and two different classes for the vector population, namely susceptible and infected. A complete global analysis of the model is given, which reveals that the global dynamics of the disease is completely determined by the associated basic reproduction number, denoted by $\mathcal{R}_0$. If $\mathcal{R}_0$ is less than one, the disease-free equilibrium is globally asymptotically stable, and in such a case, the endemic equilibrium does not exist. If $\mathcal{R}_0$ is greater than one, the disease persists and the unique endemic equilibrium is globally asymptotically stable.
Wavelet Threshold De- Noising for Mammogram Images
Saima Anwar Lashari,Rosziati Ibrahim,Norhalina Senan 보안공학연구지원센터 2015 International Journal of Software Engineering and Vol.9 No.6
Digital mammograms are coupled with noise which makes de-noising a challenging problem. In the literature, few wavelets like daubechies db3 and haar have been used for de-noising medical images. However, wavelet filters such as sym8, daubechies db4 and coif1 at certain level of soft and hard threshold have not been taken into account for mammogram images. Therefore, in this study five wavelet filters namely: haar, sym8, daubechies db3, db4 and coif1 at certain level of soft and hard threshold have been considered. Later, peak signal to noise ratio and mean squared error values are calculated. From the obtained results, it can be concluded that db3 (46.44656 db for hard threshold and 43.80779 db for soft threshold) is more appropriate filter for de-noising mammogram images while compared with other wavelets filters.
Najeeb ur Rehman Lashari,Mingshu Zhao,Jun Wang,XINHAI HE,Irfan Ahmed,Miao Miao Liang,Songpon Tangsee,Xiaoping Song 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
The energy storage properties of layered metal vanadate, especially alkali metal vanadates have beenextensively studied. Metal vanadates have a more robust electrochemical output in contrast with pristinevanadium oxides. However, the detailed processes underlying the efficiency contrast of vanadates andvanadium oxides have rarely been studied. Herein a facile hydrothermal and low-temperature polymerizationmethod was introduced to synthesize KV3O8 and KV3O8@PPy nanowire bundles as anode materialfor an aqueous rechargeable Lithium batteries. The nanowires are composed of KV3O8·0.59H2O calculatedusing thermal gravimetric analysis (TGA). Successfully synthesized layered vanadium based KV3O80.59H2O (KVO) and KV3O8 0.59H2O@PPy (KVO@PPy) nanowires and investigated the source of theimproved electrochemical efficiency of PPy coated potassium vanadates compared to pristine KVO usingcrystal structure analysis and electrochemical tests. We demonstrated increase in electrochemical stabilityfor KVO@PPy caused by synergistic effect of K+ in vanadate nanowires and PPy coating. In KVO theoxygen atoms have close contact with the K ions, and the stable K+ serve as ‘‘pillars” between interlayersto shield the layered structures from collapse during the charge/discharge phase, while the PPy reducescharge transfer resistance. This research adds helps us design better electrode materials to be used as ananode material for ARLB using alkali metal vanadate.
Stability Analysis and Optimal Control of a Vector-Borne Disease with Nonlinear Incidence
Ozair, Muhammad,Lashari, Abid Ali,Jung, Il Hyo,Okosun, Kazeem Oare Hindawi Limited 2012 Discrete dynamics in nature and society Vol.2012 No.-
<P>The paper considers a model for the transmission dynamics of a vector-borne disease with nonlinear incidence rate. It is proved that the global dynamics of the disease are completely determined by the basic reproduction number. In order to assess the effectiveness of disease control measures, the sensitivity analysis of the basic reproductive number<SUB>R0</SUB>and the endemic proportions with respect to epidemiological and demographic parameters are provided. From the results of the sensitivity analysis, the model is modified to assess the impact of three control measures; the preventive control to minimize vector human contacts, the treatment control to the infected human, and the insecticide control to the vector. Analytically the existence of the optimal control is established by the use of an optimal control technique and numerically it is solved by an iterative method. Numerical simulations and optimal analysis of the model show that restricted and proper use of control measures might considerably decrease the number of infected humans in a viable way.</P>
Lee, K.S.,Lashari, A.A. Elsevier [etc.] 2014 Applied Mathematics and Computation Vol.226 No.-
In this paper, we have proposed and mathematically modeled an epidemic problem with vector-borne disease. We have taken three different classes for the trees, namely susceptible, exposed and infected, and two different classes for the vector population, namely susceptible and infected. In the first part of our paper, we rigorously analyze our model using the dynamical systems approach. Global stability of equilibria is resolved by using Lyapunov functional. In the second part, the model is reformulated as an optimal control problem in order to determine the significance of certain control measures on the model. We apply four control parameters, namely the tree injection control to the trees, deforestation of infected trees, eradication effort of aerial insecticide spraying and the effort of restrain of mating. Both numerical and analytical methods are employed to ascertain the existence of cost effective control measures.