• Title/Summary/Keyword: Emperical

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An Analysis on the Determinants of Labor Supply for Married Women (기혼여성의 노동공급 결정요인에 관한 연구)

  • 김지경;조유현
    • Journal of the Korean Home Economics Association
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    • v.39 no.2
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    • pp.15-24
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    • 2001
  • The purpose of this research was to investigate the factors affecting the labor supply of married women. Based on the theoretical review of the process for the labor supply of married women and the review of previous research, the emperical specification was deduced as a function of husband's income, assets, education and age, the number of children and home ownership. The data of this research was collected with questionnaire in 1998. The data consisted of the answers by 200 married women. For the measurement of the emperical specification, Logit, Tobit, and Selection Bias Corrected Regression which modifies selection bias were used. Although several different discussions can made depending on the measurement method, the emperical result of this research showed that the labor supply of married women is explained by husband's income, assets, the level of education and work experience.

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A Study on Influential Subset Detection in Regression

  • Kim, Seung Gu;Yum, Joon Keun
    • Journal of Korean Society for Quality Management
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    • v.17 no.1
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    • pp.107-115
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    • 1989
  • This study is suggested tn find a methodology of influential subset detecting by using diagonal elements of the hat matrix, $h_{ij}$, and off-diagonal elements of the modified hat matrix, $h_{ij^*}$. And this study shows that elements of two matrix is very useful to detect a masking subset in various situations by analytic and emperical explanations. Also a desirable procedure to detect the significant subset and the calibration points for $h_{ij}$ and $h_{ij^*}$ are recommended.

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A SERME Control in the Hydraulic or Electric Type Drive Application

  • Ahn, T.Y.;Lee, D.O.;Kim, H.S.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1994.10a
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    • pp.455-459
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    • 1994
  • One relay control implementation to the servo control systepm is contrlved mainly for the high power electric or electro hydraulic type drive system. Proposed SERME control is relay emulated software scheme accounting a reay producing maximum torque in both direction in the insufficient bandwidth control system. Possibillty is proposed mathematically prlor to emperical work out.

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Approximate Technique for Ship′s Manoeuvrabilily Prediction (선박조종성능 추정을 위한 근사적 기법에 관한 연구)

  • Ho-Young Lee;Sang-Sung Shin
    • Journal of the Society of Naval Architects of Korea
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    • v.35 no.4
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    • pp.19-26
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    • 1998
  • In this paper, we studied the Similar Ship(SS) concept[1,2] as a method to an experimental and semi-emperical approach for the estimation of hull hydrodynamic forces and hull-propeller-rudder interaction coefficients and used these methods to predict ship's manoeuvrability. The SS concept is adopted to use experimental data of prototype ships for manoeuvrability prediction of a new ship. The SS concept is composed of the key components as follows: existence of experimental data about prototype ship, availability of semi-emperical method for estimating the changes of hull force, a method to correct the prototype ship data. On the basis of these concepts, we attempted to simulate manoeuvrability at ballast and scantling draft conditions by making use of experimental data at full load draft condition and to simulate manoeuvrability of new ships by making use of experimental data for prototype. From present calculation, it was found that the present method can predict the ship's manoeuvrability accurately at early design stage.

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A Survey Analysis on New Generation Consumers' Preferences: Concentrated on Wedding Housing Lesuire Facilities and Nursing Facilities. (신세대소비자의 선호에 관한 실태조사 : 결혼방식, 주거, 여가시설 및 탁아시설 선호를 중심으로)

  • 이기춘
    • Journal of the Korean Home Economics Association
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    • v.32 no.3
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    • pp.85-104
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    • 1994
  • The primary objective of this survey is to find out how New-Generation Consumers' preferences to wedding housing leisure facilities and nursing facilities are different by their socio-demographic and economic characteristics. 1,227 New-Generation Consumers in Seoul and its metro-politan area whose ages are greater than 20 years and less than 35 years and whose marital periods are less than 4 years are selected for emperical study. The findings show that the trends of New-Generation consumers' preferences are variety high-quality community-concept and openess et al. and nursing should be segmented by consumers' characteristics. In addition the findings suggest that consumer education for New-Generation Consumers and their parents should be performed according to desirable and socilly conscious consumption.

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A Study on the Creep Behaviour of Al-Zn-Mg Alloy (Al-Zn-Mg 계 합금의 Creep 거동에 관한 연구)

  • Park, Jong Geon;Choi, Jae Ha
    • Journal of the Korean Society for Heat Treatment
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    • v.6 no.2
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    • pp.79-88
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    • 1993
  • The static creep mechanism and behaviour of Al-Zn-Mg alloy have been investigated under condition of constant stress tension creep test in the temperature and stress range of $170-260^{\circ}C$ and 5-12.5 $kg/mm^2$ respectively. The experimental result are follows : The stress exponent value for creep was observed to about 7.3-6.43 and the activation energy for creep deformation was 44-41 kcal/mol. Larson-Miller parameter P for the crept specimens under the creep condition was obtained as P = (T + 460) (log $t_r$ + 8.6). Emperical equation for the creep rate was obtained by the computer simulation as follows. $${\varepsilon}\;=\;\exp[(-5.519{\times}10^{-4}{\sigma}+2.33{\times}10^{-2})T-6.98{\sigma}+18.295]{\times}{\sigma}^{-0.0142+10.18}\exp[\frac{(-6{\sigma}+47.8)1000}{RT}]$$ Fracture was dominated by intergranular mechanism over the experimental range.

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Efficiency of Utilization of Linear Programming in Determinining the Feed Formulas -As compared with the conventional method - (사료배합을 위한 선형계획법의 이용효과에 관한 연구)

  • 민병준
    • Korean Journal of Poultry Science
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    • v.8 no.1
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    • pp.31-36
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    • 1981
  • This study was conducted to investigate how much total feed cost can be curtailed by the application of linear programming compared with the conventional hand calculating method in determining the feed formula in feed mill. Data were collected from a feed mill producing 19 different kinds of feed and having capacity of producing 5,000 tons of feed a month. According to the results of analysis, the least-cost feed formulation by linear programming showed a decrease of 4,793,172 won monthly in total feed cost as compared with the conventional hand calculating method. But, to confirm the results of this study, it is necessary to conduct further emperical studies.

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DYNAMICAL CHARACTERISTICS OF SUNSPOT CHROMOSPHERES I. ANALYSIS OF CIRCULAR POLARIZATION MEASURED FROM A SUNSPOT

  • KIL HYO SUB;YUN HONG SIK
    • Journal of The Korean Astronomical Society
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    • v.26 no.2
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    • pp.103-114
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    • 1993
  • We have analyzed a set of high resolution photographic line profiles of a Zeeman sensitive Fe I $\lambda$ 6302.5 line taken with the Universal Birefringent Filter over a single round sunspot (SPO 5007) at the Sacramento Peak Solar Observatory. The observed spectra recorded on films are traced by PDS and the traced densities are converted to relative intensity by means of IRAF. The Stokes I and V profiles are then constructed by adding together and subtracting from each other the left and right handed circular polarizations, respectively. The reduced I and V profiles are analyzed by means of the coarse analysis(Auer et al.(1977), Skumanich and Lites(1987)) with the use of inversion technique. It is found that the umbral field strength is about 3000 gauss and the field distribution follows closely the emperical model proposed by Wittmann(1974).

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Analysis of Elastic Behavior of Composite Geomaterials Using Homogenization Theory (균질화법을 이용한 복합지반물질의 역학적 특성 해석)

  • Seo, Yong-Seok;Yim, Sung-Bin;Baek, Yong;Kwon, O-Il
    • Proceedings of the Korean Geotechical Society Conference
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    • 2006.03a
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    • pp.752-759
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    • 2006
  • Conglomerates and core-stones are the typical composite geomaterials that are composed of a weak matrix and a strong pebble part. In general, we couldn't analyze the composite geomaterials by using emperical rock classification methods. In the study, a series of analyses of elastic behavior of composite geomaterials are carried out by using homogenization theory. 45-case models are made with considering 3 kind of factors such as gravel content, size and strength of matrix. Those are applicable to various composite geomaterials of conglomerates and core-stones. The size of analysis model is large enough to exceed REV.

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A SATELLITE ELECTRONIC EQUIPMENT THERMAL ANALYSIS USING SEMI-EMPERICAL HEAT DISSIPATION METHOD (반실험적 열소산 방법을 이용한 위성용 전장품 열해석)

  • Kim Jung-Hoon;Jun Hyung-Yoll;Yang Koon-Ho
    • Journal of computational fluids engineering
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    • v.11 no.2 s.33
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    • pp.32-39
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    • 2006
  • A heat dissipation modeling method of EEE parts is developed for thermal design and analysis of an satellite electronic equipment. The power consumption measurement value of each functional breadboard is used for the heat dissipation modeling method. For the purpose of conduction heat transfer modeling of EEE parts, surface heat model using very thin ignorable thermal plates is considered instead of conventional lumped capacity nodes. These modeling methods are applied to the thermal design and analysis of CTU EM and EQM and verified by thermal cycling and vacuum tests.