• Title/Summary/Keyword: Distribution Journal

Search Result 56,942, Processing Time 0.07 seconds

Statistical Characteristics of Response Consistency Parameters in Analytic Hierarchy Process (AHP에서의 응답일관성 모수의 통계적 특성과 활용 방안)

  • 고길곤;이경전
    • Journal of the Korean Operations Research and Management Science Society
    • /
    • v.26 no.4
    • /
    • pp.71-82
    • /
    • 2001
  • Using the computer simulation method, we invest19ate the probability distribution of maximum eigenvalue of pair-wise comparison matrix, which has been used as a parameter for measuring the consistency of responses in analytic hierarchy process (AHP). We show that the shape of the distribution of the maximum eigenvalue is different according to the dimension of the matrix. In addition, we cannot find any evidence that the distribution of the Consistency Index is a Normal distribution, which has been claimed in the Previous literature. Accordingly, we suggest using so called K-index calcu1ated based on the concept of cumulative distribution function lather than based on that of arithmetic mean because the probabilistic distribution cannot be assumed to be a Normal distribution. We interpret the simulation results by comparing them with the suggestion of Saaty[11]. Our results show that using Saaty's value could be too generous when the dimension of the matrix is 3 and strict over 4. Finally, we propose new criteria for measuring the response consistency in AHP.

  • PDF

A Study on the Current Status of Network Marketing of Korea and Its Development Strategy (우리나라 네트워크 마케팅의 실태와 발전 전략)

  • Kim, Hong-seop
    • Journal of Distribution Science
    • /
    • v.3 no.1
    • /
    • pp.91-111
    • /
    • 2005
  • As the environments of world economy have been changed so rapidly, the conditions of marketing and distribution also have been altered. In korea distribution industry has been changed according to the introduction of various patterns of distribution and marketing. Among them the emerging of network marketing, same meaning with multi-level marketing in this research, is a important phenomenon of distribution industry in Korea. Not only it contributes the progress of national economy, especially distribution industry, but also it includes some limitations and criticism from the dissenters. In this paper, the clear definitions and characteristics of network marketing are suggested. And the current situations of network marketing in this country has been analyzed and compared, The future perspectives and problems of this network marketing have been diagnosed and classified for the future development and contribution for national economy. The various alternatives for the future development of network marketing have been studied and suggested in terms of each role of this industry such as distributers, consumers and government. Though this paper has a small contribution, it contains many limitations for research. Therefore it suggest future directions for further research.

  • PDF

A Study on the Operation of Physical Distribution System with the Allocation of Safety Stock (안전재고입지를 고려한 물적 분배시스템 운영에 관한 연구)

  • 김병찬;김형준
    • Journal of the Korea Safety Management & Science
    • /
    • v.3 no.3
    • /
    • pp.77-86
    • /
    • 2001
  • An operational strategy for inventory control on finished goods in the distribution system has been given attention to many enterprises and many studies regarding this field have been done and is also on-going currently. Many of these studies represented a large scale distribution network with a unified formulation by using defined symbols. These methods have provided the systematic approach of the distribution network but they are impossible to applying the reality system due to not considering the service rate of demand and treating the shortage of inventory. In order to overcome these unrealistic problems, the novel safety stock policy of responding to customers' inventory distribution network is suggested. this paper explores the transportation between Central Distribution Center(CDC) and Regional Distribution Center(RDC). Especially, the relation of transportation cost between CDC and RDC and cost of inventory control according to safety inventory with service level are emphasized. We could obtain the good results of this study by determining the optimal safety stock considering the various variables and constraints.

  • PDF

Automatic Distribution System using a Micro Controller Unit (MCU를 이용한 자동 분류 시스템)

  • Kim, Tae-Hyoung;Lee, Chan-Jae;Kwon, Jae-Hyoung;Kim, Young-Seong;Kim, Yik-Hyoun;Tak, Bo-Mi;Soh, Dea-Wha
    • Journal of the Speleological Society of Korea
    • /
    • no.81
    • /
    • pp.35-41
    • /
    • 2007
  • According as the industry develops recently, the import and export freight amount is increasing sharply, but physical distribution processing equipment ability had achieved conveyance, surge and setup of physical distribution by human's labor ability. But, inefficiency is indicated in operation of product line and warehouse or physical distribution storage equipment because is ceilinged the processing physical distribution amount and the efficiency in physical distribution processing by these labor ability.

The Determination of Stress Distribution in WC-Ni Cemented Carbide Composites by Neutron Diffraction

  • Seol, Kyeongwon
    • Korean Journal of Materials Research
    • /
    • v.5 no.2
    • /
    • pp.232-238
    • /
    • 1995
  • The thermal stress distribution of WC and Ni binder phases In WC-26st.%Ni and WC-6wt.%Ni composites has been investigated over the temperature range 100-900 K using a time-of-flight neutron diffractometer. To determine the stress distribution, the breadths of WC and Ni peaks in the reference powder and the composites were analyzed. The peak breadths were corrected for particle size effect using a procedure based on the integral peak breadth method of particle size-strain analysis. The result shows a broad range of strain, and thus stress, is present in the WC and Ni binder phases of the composites. The strain distribution of both phases broadens as the temperature decreases, and some fraction of total strain distribution of the WC phase remains tensile regardless of the temperature. The strain distribution of the WC phase broadens as the binder content increases, and that of Ni binder phase broadens as the binder content decreases, which means the strain distribution broadens as the absolute value of residual stress increase.

  • PDF

Distribution of average intervent times between adjacent rainfall events for overflow risk-based design of storm-water infiltration basin (월류위험도 기반 침투형저류지 설계를 위한 평균무강우지속시간도 작성)

  • Kim, Dae Geun;Park, Sun Jung
    • Journal of Korean Society of Water and Wastewater
    • /
    • v.22 no.2
    • /
    • pp.195-203
    • /
    • 2008
  • This study collected the latest 30-year (1976~2005) continuous rainfall data hourly recorded at 61 meterological observatories in Korea. The continuous rainfall data was divided into individual rainfall events. In addition, distribution charts of average intervent times between adjacent rainfall events were created to facilitate the application to the overflow risk-based design of storm-water infiltration basin. This study shows that the one-parameter exponential distribution is suitable for the frequency distribution of the average intervent times for the domestic rainfall data. Distribution charts of the average intervent times were created for 4 hour and 6 hour of storm separation time, respectively. The inland Gyeongsangbuk-do and Western coastal area had relatively longer average intervent times, whereas Southern coastal area and Jeju-do had relatively shorter average intervent times.

Gap-Acceptance Behavior Model of Left-Turn Drivers. (좌회전운전자의 문격수낙행태 모형)

  • 김경환
    • Journal of Korean Society of Transportation
    • /
    • v.4 no.2
    • /
    • pp.3-14
    • /
    • 1986
  • This study was undertaken to develop the gap acceptance model of left-turn drivers on the major road at intersections. Typical unsignalized intersections on the two-lane and four-lane streets in Masan City were selected for the study intersection. For the gap distribution model, the lognormal, negative exponential, shifted negative exponential, and Gamma distributions were tested using the x2 and K-S tests. Based on the results for both streets, it was concluded that among the distributions tested the lognormal distribution represented the gap distribution best, followed by the shifted negative exponential distribution. Stochastic models of the gap-acceptance behavior of left-turn drivers on the major road at unsignalized intersections were programmed using SLAM Ⅱ, a simulation computer language. A stochastic model was selected for the gap-acceptance behavior to compare the results of the simulation with the observed data. The model assumes that a fixed critical acceptance gap is assigned to each left-turn driver based on a normal distribution and the gap distribution of the opposing traffic stream follows the shifted negative exponential distribution.

  • PDF

Power Exponential Distributions

  • Zheng, Shimin;Bae, Sejong;Bartolucci, Alfred A.;Singh, Karan P.
    • International Journal of Reliability and Applications
    • /
    • v.4 no.3
    • /
    • pp.97-111
    • /
    • 2003
  • By applying Theorem 2.6.4 (Fang and Zhang, 1990, p.66) the dispersion matrix of a multivariate power exponential (MPE) distribution is derived. It is shown that the MPE and the gamma distributions are related and thus the MPE and chi-square distributions are related. By extending Fang and Xu's Theorem (1987) from the normal distribution to the Univariate Power Exponential (UPE) distribution an explicit expression is derived for calculating the probability of an UPE random variable over an interval. A representation of the characteristic function (c.f.) for an UPE distribution is given. Based on the MPE distribution the probability density functions of the generalized non-central chi-square, the generalized non-central t, and the generalized non-central F distributions are derived.

  • PDF

Goodness-of-fit tests for the inverse Weibull or extreme value distribution based on multiply type-II censored samples

  • Kang, Suk-Bok;Han, Jun-Tae;Seo, Yeon-Ju;Jeong, Jina
    • Journal of the Korean Data and Information Science Society
    • /
    • v.25 no.4
    • /
    • pp.903-914
    • /
    • 2014
  • The inverse Weibull distribution has been proposed as a model in the analysis of life testing data. Also, inverse Weibull distribution has been recently derived as a suitable model to describe degradation phenomena of mechanical components such as the dynamic components (pistons, crankshaft, etc.) of diesel engines. In this paper, we derive the approximate maximum likelihood estimators of the scale parameter and the shape parameter in the inverse Weibull distribution under multiply type-II censoring. We also develop four modified empirical distribution function (EDF) type tests for the inverse Weibull or extreme value distribution based on multiply type-II censored samples. We also propose modified normalized sample Lorenz curve plot and new test statistic.

A Study on the Velocity Distribution of Gas Molecules by the Molecular Dynamics Method (분자동역학법에 의한 기체분자의 속도분포에 관한 연구)

  • 최순호
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.28 no.3
    • /
    • pp.441-450
    • /
    • 2004
  • The velocity distribution of gas molecules from the experimental results was confirmed as the same with the Maxwell-Boltzmann's theoretical results within the experimental error. This study is on the realization of the Maxwell-Boltzmann's velocity distribution of gas molecules by the molecular dynamics(MD) method. The Maxwell-Boltzmann's velocity distribution of gas molecules is extremely important to confirm the equilibrium state because the properties of a thermodynamic system shall be obtained from the system's equilibrium configuration in the MD method. This study is the first trial in the successive researches to calculate the properties of a thermodynamic system by the computer simulations. We confirmed that the maxwell-boltzmann's velocity distribution is developed in some transient time after starting a simulation and dependent on the size of a system. Also it is found that the velocity distribution has no relation with an initial configuration of gas molecules.