• Title/Summary/Keyword: Mathematical Models

Search Result 1,788, Processing Time 0.028 seconds

A Study on Headway Distribution Models of Rural Two Lane Roads (지방부 2차로도로의 차두시간 분포 모델에 관한 연구)

  • Moon, Jaepil;Kim, Dongnyong
    • International Journal of Highway Engineering
    • /
    • v.16 no.1
    • /
    • pp.49-56
    • /
    • 2014
  • PURPOSES : This study was done to model the headway distribution of rural two lane roads. METHODS : Time headway data for the various level of traffic volumes was measured in twelve sites. Based on the time headway data, existing seven mathematical models were evaluated and selected by comparing graphically the measured and theoretical distributions and conducting the Chi-square test. RESULTS : The results show that both the Schul model and Composite Model were the most appropriate models of the models. Based on the measured time-headway distributions, this study proposed a new headway distribution model by the shift of the Schul model. CONCLUSIONS : The shifted Schul model has the ability to describe time headway distirbutons for random, intermediate, and constant-headway states.

A Study on the Determination of Optimum L.R.T Route from the Viewpoint of Revenue Maimization Principles (수익성을 감안한 경전철의 최적노선 결정방법에 관한 연구)

  • 원제무;박창호;이성모
    • Journal of Korean Society of Transportation
    • /
    • v.12 no.3
    • /
    • pp.29-47
    • /
    • 1994
  • Although subway system continues to be the backbone of transportation systems in a city like Seoul, there will still be areas across the city where subway services are not avaliable. Interest has steadily grown to fill this missing routes in overall urban transportation system. Light Rail Transit (L.R.T) system has been recently thought to be an appropriate mode of transportation by businessmen, professionals and transportation industry. In this regards, the purpose of this study is to explore whether L.R.T can be a feasible form of urban rail mode in the context of Seoul. First, the study develops the mathematical models to derive optimum route networks and stations. Integer Programming is employed to determine whether alternative routes are financially viable from the viewpoint of revenue maximization principles. Second, mathematical models developed are applied to Yoido area in order to examine the validity of model structures. The models constructed turns out be capable of handling alternative routes and stations. Application of models are successfully carried out to derive financially feasible set of routes and stations.

  • PDF

A Study on the Choice of Models for Teaching the Principle of Arithmetic Operations of Integers in the Middle School Mathematics Class (중학교 수학 수업에서 정수의 사칙계산의 원리에 따른 모델 선택에 관한 연구)

  • Kim, Ik-Pyo;Jung, Eun Hee
    • The Mathematical Education
    • /
    • v.51 no.4
    • /
    • pp.429-453
    • /
    • 2012
  • The purpose of the study were to analyze teaching models of arithmetic operations of integers in Korean middle school mathematics textbooks of the first grade and Americans', from which we compare and analyze standards for choice of models of middle school teachers and preservice mathematics teachers. We also analyze the effect of the choice of teaching models for students to understand and appreciate number systems as a coherent body of knowledge. On the basis of that, we would like to find the best model to help students understand and reason the process of formulate the arithmetic operations of natural numbers and integers into the operation of the real number system. Furthermore, we help these series of the study to be applied effectively in the middle school mathematics class in Korea.

A WEAKLY DEPENDENCE CONCEPT IN MOVING AVERAGE MODELS

  • Baek, Jong-Il;Lim, Ho-Un;Youn, Eun-Ho
    • Communications of the Korean Mathematical Society
    • /
    • v.12 no.3
    • /
    • pp.743-754
    • /
    • 1997
  • We introduce a class of finite and infinite moving average (MA) sequences of multivariate random vectors exponential marginals. The theory of dependence is used to show that in various cases the class of MA sequences consists of associated random variables. We utilize positive dependence properties to obtain some probability bounds for the multivariate processes.

  • PDF

Development of Creativity through Mathematical Applications

  • Donaldson, John D.
    • Research in Mathematical Education
    • /
    • v.8 no.3
    • /
    • pp.145-155
    • /
    • 2004
  • Mathematics, by its nature, is a creative activity. Creativity can be developed either through considering its intrinsic beauty or by examining the role that it plays in applications to real world problems. Many of the great mathematicians have been vitally interested in applications and gained inspiration in developing new mathematics from the mathematical descriptions of physical phenomena. In this paper we will examine the processes of applying mathematics by looking at how mathematical models are formed and used. Applications from sport, the environment and populations are used as illustrations.

  • PDF

Study of a Characteristics of Maneuvering Mathematical Model of Twin POD Cruise Ship (2축 POD 여객선의 조종운동 수학모형 특성 연구)

  • Kim, Yeon-Gyu;Yun, Kun-Hang;Kim, Sun-Young;Son, Nam-Sun
    • Journal of the Society of Naval Architects of Korea
    • /
    • v.50 no.6
    • /
    • pp.429-435
    • /
    • 2013
  • Recently, to improve the safety and maneuverability at fairway around harbor the POD system has been equipped on a ship. And the interest about maneuvering characteristics of a cruise ship has been increasing. In this paper the mathematical model of maneuvering motion of a cruise ship with twin POD system in general speed and slow speed are presented. And the maneuvering coefficients of mathematical model are obtained from the captive model tests using CPMC(Computerized Planar Motion Carriage). Computer simulation using mathematical model in general speed and slow speed are carried out and compared with the results of free running model test with the same model ship. The differences between the mathematical models are compared and discussed. In this paper the mathematical models, the results of captive model test and simulation results are presented.

ON THE MINIMAX VARIANCE ESTIMATORS OF SCALE IN TIME TO FAILURE MODELS

  • Lee, Jae-Won;Shevlyakov, Georgy-L.
    • Bulletin of the Korean Mathematical Society
    • /
    • v.39 no.1
    • /
    • pp.23-31
    • /
    • 2002
  • A scale parameter is the principal parameter to be estimated, since it corresponds to one of the main reliability characteristics, namely the average time to failure. To provide robustness of scale estimators to gross errors in the data, we apply the Huber minimax approach in time to failure models of the statistical reliability theory. The minimax valiance estimator of scale is obtained in the important particular case of the exponential distribution.

Mathematical Models for Hit Probabilities using Small-arms against Fast Low Flying Aircraft

  • Park, Chan-Tae
    • Journal of the military operations research society of Korea
    • /
    • v.7 no.1
    • /
    • pp.81-117
    • /
    • 1981
  • Mathematical models for hit probabilities of small arms are developed in order to estimate the expected hits on an aircraft for certain altitudes and air speeds. A model for the firing lead angle is developed for cases when the distribution of hits is normal and the firing angle is from 20 degrees to 160 degrees. probabilities of hit for single and multiple shots at various altitudes are calculated. Tables are given showing the probability of hits and kill for targets flying at high speed above 500 feet from ground level.

  • PDF

ON THE DYNAMICS OF PREDATOR-PREY MODELS WITH IVLEV'S FUNCTIONAL RESPONSE

  • RYU, KIMUN
    • Journal of the Chungcheong Mathematical Society
    • /
    • v.28 no.3
    • /
    • pp.465-472
    • /
    • 2015
  • In this paper, we study the existence and the stability of equilibria of predator-prey models with Ivlev's functional response. We give a simple proof for the uniqueness of limit cycles of the predator-prey system. The existence and the stability at the origin and a boundary equilibrium point(including the positive equilibrium point) are also investigated.

New Curriculum Models for Mathematics Department in Korean College (수학과의 새로운 교육과정 모형)

  • Lee Choon Ho;Lee Sang-Gu;Yoon Suk-Bong
    • Communications of Mathematical Education
    • /
    • v.19 no.4 s.24
    • /
    • pp.671-682
    • /
    • 2005
  • One of the main function of the university is to be the center of education for the future generation. We analyze the changing standard of mathematics curriculums in Korean colleges and introduce new curriculum models in our changing social and educational environment.

  • PDF