• Title, Summary, Keyword: global stability

Search Result 652, Processing Time 0.043 seconds

An intelligent fuzzy theory for ocean structure system analysis

  • Chen, Tim;Cheng, C.Y.J.;Nisa, Sharaban Tahura;Olivera, Jonathan
    • Ocean Systems Engineering
    • /
    • v.9 no.2
    • /
    • pp.179-190
    • /
    • 2019
  • This paper deals with the problem of the global stabilization for a class of ocean structure systems. It is well known that, in general, the global asymptotic stability of the ocean structure subsystems does not imply the global asymptotic stability of the composite closed-loop system. The classical fuzzy inference methods cannot work to their full potential in such circumstances because given knowledge does not cover the entire problem domain. However, requirements of fuzzy systems may change over time and therefore, the use of a static rule base may affect the effectiveness of fuzzy rule interpolation due to the absence of the most concurrent (dynamic) rules. Designing a dynamic rule base yet needs additional information. In this paper, we demonstrate this proposed methodology is a flexible and general approach, with no theoretical restriction over the employment of any particular interpolation in performing interpolation nor in the computational mechanisms to implement fitness evaluation and rule promotion.

¹H NMR Study of the Effect of G-T Mismatches on Dynamics and Stability of d(GCGTGCGC)₂ and Its Berenil Complex

  • 허성호;홍석주;이조웅;정채준
    • Bulletin of the Korean Chemical Society
    • /
    • v.17 no.11
    • /
    • pp.1045-1052
    • /
    • 1996
  • The effects of G-T mismatches on thermal stability, the base-pair lifetime and the global structure of a d(GCGTGCGC)2 duplex were studied by using 1H NMR, UV and CD spectroscopy. The existence of G-T mismatches was found to cause a noticeable change in the chemical environment of imino protons associated with significant decrease in the base-pair lifetime at the mismatched site as well as in thermal stability of the duplex itself. The melting transition of d(GCGTGCGC)2 was not cooperative at all at 100 mM or lower concentration of NaCl, but became cooperative at 500 mM or higher NaCl concentration. The melting temperature (Tm) of this duplex was 32℃ at 500 mM concentration of NaCl, which is much lower than that of d(GCGCGCGC)2 at the same NaCl concentration. This suggests that the decrease in stability may be ascribed to the decrease in the base-pair lifetime and the deviation from the normal structure due to the G-T mismatches. Adding berenil to d(GCGTGCGC)2 caused no observable change in the global structure but the large decrease in the base-pair lifetime and the stability of the duplex.

  • PDF

Geometric Nonlinear Analysis Formulation for Spatial Frames using Stability Functions (Stability Function을 이용한 공간 뼈대구조물의 기하학적 비선형해석 포뮬레이션)

  • 윤영묵;박준우
    • Proceedings of the Computational Structural Engineering Institute Conference
    • /
    • /
    • pp.201-207
    • /
    • 1998
  • In this study, a geometric nonlinear analysis formulation for spatial frames is developed using the 3D stability functions. For the formulation, the relationships of local and global coordinate systems in force, deformation, and the initial and current configurations of a frame are derived. The force-deformation relationship in global coordinate system is derived as well. The developed formulation is verified in each derivation by reducing the derived equations into 2D equations. The gradual plastification of connections and critical sections can be implemented effectively to this formulation for the complete second order inelastic advanced analysis of spatial frames.

  • PDF

A Study on Stability Hanging Guide Frame used in Floating Crane (해상 Crane용 Guide Frame의 안정성에 관한 연구)

  • 장동일;민인기
    • Journal of the Korean Society of Safety
    • /
    • v.14 no.1
    • /
    • pp.33-40
    • /
    • 1999
  • In this paper, a damaged example of hanging guide frame used in the lifting of shore protection caisson was investigated. An examination of the stress and stability of members was carried out by structural analysis and the causes of damages was investigated. The stability analysis considering local and global stress buckling was performed. As a result of stability analysis. the first structure was unstable structure. Therefore improved structure was examined and the best effective methodology was the reassignment of wire.

  • PDF

Numerical Methods for Compressible Boundary Flow Stability

  • Dong, Xue-Zhi;Tan, Chun-Qing
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • /
    • pp.737-742
    • /
    • 2008
  • Methods for the solution of linear stability for compressible boundary layers are developed. Both the global and local methods for stability analysis are used. Both methods are use in solution of Coutte shear flow and the results are analysis and compare. Some well-known conclusions of Coutte flow are proved by these methods again.

  • PDF

STABILITY ANALYSIS OF AN HIV PATHOGENESIS MODEL WITH SATURATING INFECTION RATE AND TIME DELAY

  • Liao, Maoxin;Zhao, Sa;Liu, Manting
    • Journal of applied mathematics & informatics
    • /
    • v.32 no.3_4
    • /
    • pp.475-489
    • /
    • 2014
  • In this paper, a mathematical model for HIV infection with saturating infection rate and time delay is established. By some analytical skills, we study the global asymptotical stability of the viral free equilibrium of the model, and obtain the sufficient conditions for the local asymptotical stability of the other two infection equilibria. Finally, some related numerical simulations are also presented to verify our results.

EXISTENCE AND STABILITY OF ALMOST PERIODIC SOLUTIONS FOR A CLASS OF GENERALIZED HOPFIELD NEURAL NETWORKS WITH TIME-VARYING NEUTRAL DELAYS

  • Yang, Wengui
    • Journal of applied mathematics & informatics
    • /
    • v.30 no.5_6
    • /
    • pp.1051-1065
    • /
    • 2012
  • In this paper, the global stability and almost periodicity are investigated for generalized Hopfield neural networks with time-varying neutral delays. Some sufficient conditions are obtained for the existence and globally exponential stability of almost periodic solution by employing fixed point theorem and differential inequality techniques. The results of this paper are new and complement previously known results. Finally, an example is given to demonstrate the effectiveness of our results.

Delay-dependent Stability Criteria for Uncertain Stochastic Neural Networks with Interval Time-varying Delays (구간 시변 지연이 존재하는 불확실 확률적 뉴럴 네트웍의 지연의존 안전성 판별법)

  • Kwon, Oh-Min;Park, Ju-Hyun;Lee, Sang-Moon
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.57 no.11
    • /
    • pp.2066-2073
    • /
    • 2008
  • In this paper, the problem of global asymptotic stability of uncertain stochastic neural networks with delay is considered. The delay is assumed to be time-varying and belong to a given interval. Based on the Lyapunov stability theory, new delay-dependent stability criteria for the system is derived in terms of LMI(linear matrix inequality). Three numerical examples are given to show the effectiveness of proposed method.

EXPONENTIAL STABILITY OF A CLASS OF NONLINEAR DIFFERENCE EQUATIONS IN BANACH SPACES

  • Nguyen, Sinh Bay;Le, Van Hien;Hieu, Trinh
    • Communications of the Korean Mathematical Society
    • /
    • v.32 no.4
    • /
    • pp.851-864
    • /
    • 2017
  • The problems of global and local exponential stability analysis of a class of nonlinear non-autonomous difference equations in Banach spaces are studied in this paper. By a novel comparison technique, new explicit exponential stability conditions are derived. Numerical examples are given to illustrate the effectiveness of the obtained results.

THE ASYMPTOTIC STABILITY OF SOME INTEGRODIFFERENTIAL EQUATIONS

  • Chern, Jann-Long;Huang, Shu-Zhu
    • Bulletin of the Korean Mathematical Society
    • /
    • v.37 no.2
    • /
    • pp.273-283
    • /
    • 2000
  • In this paper we consider two delay equations with in-finite delay. We will give two sufficient conditions for the positive and zero equilibriums of these equations to be a global attractor respectively.

  • PDF