• Title/Summary/Keyword: Continuous-Time Model

Search Result 1,046, Processing Time 0.034 seconds

Multimedia Synchronization Method for Presenting Event Objects (이벤트 객체를 표현하기 위한 멀티미디어 동기화 기법)

  • 이근왕;이기성;김은영
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.25 no.3B
    • /
    • pp.431-436
    • /
    • 2000
  • It is required for us to design multimedia synchronization model which present mixed media, tat contains not only continuous medial but also discontinuous media. And it is useful for us to develop multimedia application software. Proposed paper represents model tat expresses continuous media and discontinuous media. And continuous medial show the temporal relations between media objects then discontinuous media spatial relations. The model proposed in this paper is effective in applying the system to guarantee high quality of services and can process real time application form applying efficient multiple key media when events occur. We verified that the proposed model has improved media palyout rate compared with other previous synchronization models through simulation.

  • PDF

Design of State Feedback Controller for Fuzzy Systems: Intelligent Digital Redesign (퍼지 시스템을 위한 샘플치 데이터 상태 피드백 제어기 설계: 지능헝 디지털 재설계 접근)

  • Kim, Do-Wan;Joo, Young-Hoon;Park, Jin-Bae
    • Proceedings of the KIEE Conference
    • /
    • 2005.07d
    • /
    • pp.2480-2482
    • /
    • 2005
  • This paper presents a complete solution to intelligent digital redesign problem (IDR) for sampled-data fuzzy systems. The IDR problem is the problem of designing a sampled-data state feedback controller such that the sampled-data fuzzy system is equivalent to the continuous-time fuzzy system in the sense of the state matching. Its solution is simply obtained by linear transformation. Under the proposed sampled-data controller, the states of the discrete-time model of the sampled-data fuzzy system completely matches the state of the discrete-time model of the closed-loop continuous-time fuzzy systems are completely matched at every sampling points.

  • PDF

The study of stochastic inventory model with setup cost and backorder rate (Setup cost와 Backorder rate를 고려한 확률적 재고모형에 관한 연구)

  • 유승우;서창현;김경섭
    • Proceedings of the Korea Society for Simulation Conference
    • /
    • 2003.06a
    • /
    • pp.129-134
    • /
    • 2003
  • In this paper, we determine optimal reduction in the lead time and setup cost for some stochastic inventory models. And we propose more general model that allow the backorder rate as a control variable. We first assume that the lead time demand follows a normal distribution. And we assume that the backorder rate is dependent on the length of lead time through the amount of shortages. The stochastic models analyzed in this paper are the classical continuous and periodic review policy models with a mixture of backorders and lost sales. For each of these models, we provide a sufficient conditions for the uniqueness of the optimal operating policy. We also develop algorithms for solving these models and provide illustrative numerical examples.

  • PDF

Eigenvalue Sensitivity Analysis of Discrete Power Systems Including Generator Controllers and TCSC (발전기 제어장치와 TCSC를 포함하는 이산 전력시스템의 고유치 감도해석)

  • Kim, Deok-Young
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.24 no.12
    • /
    • pp.193-200
    • /
    • 2010
  • In this paper, the eigenvalue sensitivity analysis is calculated in the power system which is including both generator controllers such as Exciter, PSS and thyristor controlled FACTS devices in transmission lines such as TCSC. Exciter and PSS are continuously operating controllers but TCSC has a switching device which operates non-continuously. To analyze both continuous and non-continuous operating equipments, the RCF method one of the numerical analysis method in discrete time domain is applied using discrete models of the power system. Also the eigenvalue sensitivity calculation algorithm using state transition equations in discrete time domain is devised and applied to a sampled system. As a result of simulation, the eigenvalue sensitivity coefficients calculated using discrete system models in discrete time domain are changed periodically and showed different values compared to those of continuous system model in time domain by the effect of periodic switching operations of TCSC.

Direct construction of a four-dimensional mesh model from a three-dimensional object with continuous rigid body movement

  • Otomo, Ikuru;Onosato, Masahiko;Tanaka, Fumiki
    • Journal of Computational Design and Engineering
    • /
    • v.1 no.2
    • /
    • pp.96-102
    • /
    • 2014
  • In the field of design and manufacturing, there are many problems with managing dynamic states of three-dimensional (3D) objects. In order to solve these problems, the four-dimensional (4D) mesh model and its modeling system have been proposed. The 4D mesh model is defined as a 4D object model that is bounded by tetrahedral cells, and can represent spatio-temporal changes of a 3D object continuously. The 4D mesh model helps to solve dynamic problems of 3D models as geometric problems. However, the construction of the 4D mesh model is limited on the time-series 3D voxel data based method. This method is memory-hogging and requires much computing time. In this research, we propose a new method of constructing the 4D mesh model that derives from the 3D mesh model with continuous rigid body movement. This method is realized by making a swept shape of a 3D mesh model in the fourth dimension and its tetrahedralization. Here, the rigid body movement is a screwed movement, which is a combination of translational and rotational movement.

Advanced Time-Cost Trade-Off Model using Mixed Integer Programming (혼합정수 프로그래밍 기법을 이용한 진보된 Time-Cost Trade-Off Model)

  • Kwon, Obin;Lee, Seunghyun;Son, Jaeho
    • Korean Journal of Construction Engineering and Management
    • /
    • v.16 no.6
    • /
    • pp.53-62
    • /
    • 2015
  • Time-Cost Trade-Off (TCTO) model is an important model in the construction project planning and control area. Two types of Existing TCTO model, continuous and discrete TCTO model, have been developed by researchers. However, Using only one type of model has a limitation to represent a realistic crash scenario of activities in the project. Thus, this paper presents a comprehensive TCTO model that combines a continuous and discrete model. Additional advanced features for non-linear relationship, incentive, and liquidated damage are included in the TCTO model. These features make the proposed model more applicable to the construction project. One CPM network with 6 activities is used to explain the proposed model. The model found an optimal schedule for the example to satisfy all the constraints. The results show that new model can represent more flexible crash scenario in TCTO model.

A Fault Detection Method for Uncertain Continuous and Discrete-Time Systems (불확실한 연속형 및 이산형 시스템에서의 이상검출법)

  • Hwang, In-Koo;Kwon, Oh-Kyu
    • Journal of the Korean Institute of Telematics and Electronics
    • /
    • v.27 no.10
    • /
    • pp.60-67
    • /
    • 1990
  • This paper proposes a model-based fault detection method for linear/nonlinear system having modelling errors, nonlinearities and measurement noise. The system model is represented by the unified operator [5] in order to apply to both the continuous-time and discrete-time problems. The fault detection method suggested here accounts for the effects of noise, model mismatch and nonlinearities. Modelling errors are depicted by additive forms and the nominal model denominator is fixed via prior experiments in order to quantify the nucertainty bound on the parameter estima-tion. The least square method is used to estimate the numerator parameters of the nominal model. performance than traditional methods.

  • PDF

Development of the Continuous-Time HGDM with Binomial Sensitivity Factor (이항 반응 계수를 가진 연속 시간형 HGDM의 개발)

  • Park, Joong-Yang;Kim, Seong-Hee;Park, Jae-Heong
    • The Transactions of the Korea Information Processing Society
    • /
    • v.6 no.12
    • /
    • pp.3490-3499
    • /
    • 1999
  • The hyper-geometric distribution software reliability growth model (HGDM) was recently developed and successfully applied to the problem of estimating the number of initial faults residual in a software at the beginning of the test-and-debug phase. Though the HGDM is a time-domain software reliability growth model(SRGM), it is not possible to compare the HGDM with other time-domain SRGMs. Furthermore the usual software reliability can not be computed. These drawbacks are derived from fact that the HGDM is not described in terms of the execution time. Thus we develop a continuous-time HGDM with binomial sensitivity factor in order to remove these drawbacks. Statistical characteristics of the suggested model are studied and its applicability is then examined by analyzing real test data sets. It is empirically shown that the continuous-time HGDM with binomial sensitivity factor can be used as an alternative to the current HGDM.

  • PDF

In-service Real-time and Continuous Objective Video Quality Assessment for DTV Broadcasting

  • Han, Chan-Ho
    • Journal of Korea Multimedia Society
    • /
    • v.16 no.1
    • /
    • pp.50-55
    • /
    • 2013
  • This article presents a simple and reasonable in-service, real-time, and continuous single-ended objective video quality assessment model for DTV broadcasting using a multiburst signal at the bottom of the transient effect area, similar to Vertical Interval Test Signals. The issue of in-service video-quality monitoring in DTV broadcasting is addressed, and an effective method of quality monitoring is presented. The proposed method is also implemented and tested in a range of situations using a simulated HDTV broadcasting network.

Further Properties of a Model for a System Subject to Continuous Wear

  • Lee, Eui-Yong;Laurence A. Baxter
    • Journal of the Korean Statistical Society
    • /
    • v.20 no.2
    • /
    • pp.139-146
    • /
    • 1991
  • A generalization of an earlier diffusion model for system subject to continuous wear is presented. It is assumed that the state of the system is modelled by Brownian motion with negative drift and an absorbing barrier at the origin. A repairman arrives according to a stationary renewal process and increases the state of the system by a random amount if the state does not exceed a threshold. Various properties of this model are investigated including the distribution of the state of the system at time t, the first passage time to state 0 and the probability that the state of the system exceeds a certain level throughout a specified interval.

  • PDF