• Title/Summary/Keyword: time-out

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CFD PARAMETRIC STUDY FOR 2D WATER ENTRY

  • Lee, H.H.;Rhee, S.H.
    • 한국전산유체공학회:학술대회논문집
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    • 2009.04a
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    • pp.191-195
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    • 2009
  • A parametric study for for the water entry of a two dimensional symmetric wedge with deadrise angle of 10 degrees was carried out to find out the most dominant parameter. Water entry problem with constant velocity is simplified as the stationary wedge in the way of the upcoming water surface. The calculated impact loads showed that the effect of the viscosity was not so important in this problem. For a given grid system a suitable time step size can be found. The most sensitive parameter was found to be the grid size.

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Effect of Rebar Corrosion on the Onset of Cracks in Cover Concrete (철근부식에 의한 콘크리트의 균열발생에 관한 연구)

  • 이한승
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.10a
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    • pp.771-774
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    • 1999
  • This study was carried out to quantitatively investigate the amount of corrosion at the time of onset of cracks in cover concrete due to rebar corrosion. In this experiments, the accelerated galvanostatic corrosion method was carried out. FEM analyses were also conducted to investigate the expansive behaviors due to rebar corrosion and the mechanical properties of corrosion products. As a result, it was concluded that the corrosion ratio at the time of onset of cracks in cover concrete was 3% by weight. The onset of cracks in cover concrete due to rebar corrosion could be analyzed by the finite element method.

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AN ELECTROMAGNETIC FREE CONVECTION FLOW OF A MICROPOLAR FLUID WITH RELAXATION TIME

  • Zakaria, M.
    • Journal of applied mathematics & informatics
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    • v.8 no.2
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    • pp.539-550
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    • 2001
  • In the present investigation, we study the influence of a transverse magnetic field through a porous medium. Laplace transform techniques are used to derive the solution in the Laplace transform domain. The inversion process is carried out using a numerical method based on Fourier series expansions. Numerical computations for the temperature, the microrotation and the velocity distributions as well as for the induced magnetic and electric fields and carried out and represented graphically.

Reliability of a Consecutive-k-out-of n : G System with Common-Cause Outage

  • Kim, Ho-Yong;Jung, Kyung-Hee
    • Journal of the Korean Operations Research and Management Science Society
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    • v.17 no.3
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    • pp.181-193
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    • 1992
  • This paper shows the model of a consecutive-k-out-of-n :G system with common-cause outages. The objective is to analytically derive the mean operating time between failures for a non-repairable component system. The average failure time of a system and the system availability are also considered. Then, the model is extended to a system with repairable components and unrestricted repair, in which service times are exponentially distributed.

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A Simulation Analysis for Selecting In/Out Port Ratio in FAX Network System Operation (팩스 통신망 입출력회선 비율 설정에 관한 시뮬레이션 분석)

  • 나윤균
    • Journal of the Korea Society for Simulation
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    • v.8 no.2
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    • pp.101-109
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    • 1999
  • In a commercial facsimile network system, a simulation analysis has been performed using ARENA due to the unavailability of theoretical models. The effect of a priority is compared with that of the current FCFS rule on the arriving call blocking rate and transmission time delay. The result shows that the priority rule reduces more service time delay as the arrival rate increases. A simulation analysis procedure is proposed to select optimal in/out port ratio at various hourly arrival rates with a given multiple-place transmission requests ratio.

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Wives Leisure Time and the Perceive Quality of Life (주부의 여가시간과 생활의 질 인식에 관한 연구 - 교육기 자녀를 가진 비취업 주부를 중심으로)

  • 한경미;황덕순
    • Journal of Families and Better Life
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    • v.8 no.1
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    • pp.69-82
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    • 1990
  • The purposes of this are to figure out the amounts of leisure time of full-time homemakers and to find out leisure time factors contributed to raise the quality of life. The major findings are the followings: 1) Full-time homemakers spend 353 minutes(5.9 hours) on the average per day on the leisure. Time for active leisure(creative activities, sports activities, spectator events, going to the party, and so on) is 70 minutes, while that for passive leisure(watching TV. listening to the radio, reading newspapers. magazines. Books, chating, relaxing, card playing) is 283 minutes(4.7 hours). The passive leisure is the main type of spending leisure time. 2) The total leisure time of wives is significantly related to SES factors. The higher the wives age and education, the family income, and the age of the latest child, the more the wives total leisure time. But the more the family numbers, and the child numbers, the lower the leisure time. Active leisure time is highly rela ed to family income, while passive leisure time is considerably family composition. 3) The wives are mostly satisfied with their lives. The wives perceptions of the quality of life is related to wives's education, house type, and family income. 4) The wives total leisure time is not related to the quality of life. There is a positive correlation between active leisure time and the quality of life, while a negative relationship is between passive leisure time and the perception of the quality of life. 5) In analysis of causal model, it appears that family income and active leisure time of wives directly affect the perceived quality of life. The more the family income and active leisure time, the higher the quality of life. it is implicated for wives to take and active attitude and to reduce, if possible, passive leisure time and to increase active leisure time.

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Delay Time Estimation in Frequency Selective Fading Channels

  • Lee Kwan-Houng;Song Woo-Young
    • Journal of information and communication convergence engineering
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    • v.3 no.3
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    • pp.119-121
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    • 2005
  • This paper aims to estimate the delay time of multiple signals in a multi-path environment. It also seeks to carry out a comparative analysis with the existing delay time under the proposed algorithm to develop a new algorithm that applies the space average method in a MUSIC algorithm. Unlike the existing delay time estimation algorithm, the developed algorithm was able to estimate the delay time in 5ns low. Therefore, the algorithm proposed in this paper improved the existing delay time estimated algorithm.

Distributed Real-time Simulation for the performance analysis of Fault Detector (고장 탐지 방법의 성능 분석을 위한 분산 실시간 시뮬레이션)

  • 노진홍;홍영식
    • Proceedings of the Korean Information Science Society Conference
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    • 2002.04a
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    • pp.82-84
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    • 2002
  • 신뢰성이 높은 분산 시스템은 고장 발생 시 고장을 탐지하고, 다른 관련된 노드들에게 고장을 알려주어서 적절한 처리를 할 수 있어야 한다. 기존의 act 와 time-out 을 사용한 고장 탐지방법은 수신되지 않는 ack 에 대한 부하가 높은 단점을 가지고 있다. 높은 신뢰성을 요구하는 분산 실시간 시스템에서는 데드라인을 준수하기 위해 고장처리에 대한 time-bound 를 결정할 수 있어야 하므로, 기존의 ack 와 time-out 에 기반한 고장방법을 사용하기에 부적절하다. 따라서 본 논문에서는 신뢰성 있는 분산 실시간 멀티캐스트 프로토착에 결합된 고장 탐지 기법으로서 사용될 기존의 고장 탐지 방법을 대상으로 고장 탐지 방법을 실험하고, 그 결과를 분석하여 고장탐지 및 고장처리 지연시간이 데드라인을 보장할 수 있는지 검사한다.

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Development of Simulation Model to Determine the Optimal Number of Pharmacist at the Hospital Pharmacy Considering the Waiting Time (병원약제부의 적정약사수를 결정하기 위해 대기시간을 고려한 시뮬레이션 모델 개발)

  • 최재혁;이배진;강창욱;최경업;김정미
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.21 no.48
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    • pp.223-232
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    • 1998
  • In order to improve the hospital service quality, some hospitals try to reduce the outpatients' waiting time in the hospital. One of the dissatisfied service items at the hospital is the long waiting time to take the prescribed medicine. In most cases, the smaller the number of pharmacists, the longer could be the waiting time. The suggestion of criteria for optimal allocation of appropriate number of pharmacists must be very important to manage the hospital pharmacy. In this paper, we suggest the method to figure out appropriate number of pharmacists through the real situation study at the Sampling Medical Center Pharmacy. We present the simulation study results using the simulation package ARENA and the analysis of statistical distribution of the arriving prescriptions. The result of this research could be applied to the other service business to figure out the optimal allocation of available human resources and to do the job analysis for better service quality.

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A development of travel time estimation algorithm fusing GPS probe and loop detector (GPS probe 및 루프 검지기 자료의 융합을 통한 통행시간추정 알고리즘 개발)

  • 정연식;최기주
    • Journal of Korean Society of Transportation
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    • v.17 no.3
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    • pp.97-116
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    • 1999
  • The growing demand for the real time traffic information is bringing about the category and number of traffic collection mechanism in the era of ITS. There are, however, two problems in making data into information using various traffic data. First, the information making process of making data into the representative information, for each traffic collection mechanism, for the specified analysis periods is required. Second, the integration process of fusing each representative information into "the information" for each link out of each source is also required. That is, both data reduction and/or data to information process and information fusion are required. This article is focusing on the development of information fusing algorithm based on voting technique, fuzzy regression, and, Bayesian pooling technique for estimating the dynamic link travel time of networks. The proposed algorithm has been validated using the field experiment data out of GPS probes and detectors over the roadways and the estimated link travel time from the algorithm is proved to be more useful than the mere arithmetic mean from each traffic source.

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