• Title/Summary/Keyword: fixed effect

Search Result 2,882, Processing Time 0.027 seconds

The Influences of Fixed Assets on Corporate Performance - Evidence from Manufacturing-listed Companies in China (고정 자산이 기업 실적에 미치는 영향 - 중국에서 성장 제조업 회사들의 증거)

  • Lv, Yeqing;Zheng, Ziyang;Wang, Yuan
    • The Journal of the Korea Contents Association
    • /
    • v.21 no.2
    • /
    • pp.548-561
    • /
    • 2021
  • Manufacturing is a pillar industry for national economic growth. Analyzing the internal problems of manufacturing enterprises can solve the difficulties faced by manufacturing enterprises and improve the overall performance of manufacturing enterprises.This study selected 1,546 listed manufacturing companies in Shenzhen and Shanghai stock markets from 2009 to 2015, and empirically analyzed the relationship between fixed assets and corporate performance by using the fixed effect model and the two-way fixed effect model.The study finds 1) the scale of fixed assets has a negative effect on corporate performance. 2) the quality of fixed assets has a weak positive relationship with fixed assets. 3) the growth rate of fixed assets impacts corporate performance positively.

The Relationship between Inventories and Fixed Investment (재고스톡과 고정투자 간의 관계 분석: 상장 제조기업 분석을 통한 외환위기 전·후 비교)

  • Shin, Sunwoo
    • KDI Journal of Economic Policy
    • /
    • v.28 no.1
    • /
    • pp.117-144
    • /
    • 2006
  • This study is to analyze the existence of the real buffer effect that reflects the effect of beginning-of-period inventory stocks effect on the demand for fixed investment, and the financial buffer effect indicates the substitution effect between end-of-period inventory stock and the source of financing for fixed investment. I use panel data of 361 Korean listed non-financial firms during 1990-2003. After the crisis, it also observed whether the relationship between inventory stocks and fixed investment has altered or not. I review the theoretical connection between inventory stock and fixed investment through the paper by Bo(2004) and estimate the investment model by the method of GMM-SYS. The results show negative relation between end-of-period inventory stock and fixed investment in the whole period and each period classified, also it confirms that the relation between fixed investment and end-of-period investment is significantly negative. It can be interpreted through two aspects that firms not only use inventory stock as a buffer in response to unexpectedly high demand, but also utilize inventory stock as a source of financing for fixed investment. The results imply that firm's decision-making is much correlated with production-and-inventory stock adjustment, decision-making about fixed investment, and decision-making about financial affairs.

  • PDF

A Study on Developing Crash Prediction Model for Urban Intersections Considering Random Effects (임의효과를 고려한 도심지 교차로 교통사고모형 개발에 관한 연구)

  • Lee, Sang Hyuk;Park, Min Ho;Woo, Yong Han
    • The Journal of The Korea Institute of Intelligent Transport Systems
    • /
    • v.14 no.1
    • /
    • pp.85-93
    • /
    • 2015
  • Previous studies have estimated crash prediction models with the fixed effect model which assumes the fixed value of coefficients without considering characteristics of each intersections. However the fixed effect model would estimate under estimation of the standard error resulted in over estimation of t-value. In order to overcome these shortcomings, the random effect model can be used with considering heterogeneity of AADT, geometric information and unobserved factors. In this study, data collections from 89 intersections in Daejeon and estimates of crash prediction models were conducted using the random and fixed effect negative binomial regression model for comparison and analysis of two models. As a result of model estimates, AADT, speed limits, number of lanes, exclusive right turn pockets and front traffic signal were found to be significant. For comparing statistical significance of two models, the random effect model could be better statistical significance with -1537.802 of log-likelihood at convergence comparing with -1691.327 for the fixed effect model. Also likelihood ration value was computed as 0.279 for the random effect model and 0.207 for the fixed effect model. This mean that the random effect model can be improved for statistical significance of models comparing with the fixed effect model.

Removal of Phenol by Granular Activated Carbon from Aqueous Solution in Fixed-Bed Adsorption Column : Parameter Sensitivity Analysis (충진층 흡착관 내에서 입상활성탄에 의한 페놀 제거 : 매개변수 감응도 해석)

  • 윤영삼;황종연;권성헌;김인실;박판욱
    • Journal of Environmental Science International
    • /
    • v.7 no.6
    • /
    • pp.773-782
    • /
    • 1998
  • The adsorption experiment of phenol(Ph) from aqueous solution on granular activated carbon was studied in order to design the fixed-bed adsorption column. The experimental data were analyzed by unsteady-state, one-dimensional heterogeneous model. Finite element method(FEM) was applied to analyze the sensitivity of parameter and to predict the fixed-bed adsorption column performance on operation variable changes. The prediction model showed similar effect to mass transfer and intraparticle diffusion coefficient changes suggesting that both parameter present mass transfer rate limits for GAC-phenol system. The Freundlich constants had a greater effect than kinetic parameters for the performance of fixed-bed adsorption column. FEM solution facilitated prediction of concentration history in solution and within adsorbent particle.

  • PDF

Study on the Effect of Earthquake Loads for Fixed Offshore Wind Turbines According to Soil Type (지반 종류에 따른 고정식 해상 풍력발전기 지진 하중 영향 연구 )

  • Yongoon Oh;Jeonggi Kim;Miseon Kim;Jonghun Jung;Johyug Bang
    • Journal of Wind Energy
    • /
    • v.14 no.1
    • /
    • pp.14-20
    • /
    • 2023
  • In this study, using the commercial software Bladed developed by DNV for integrated load calculation of wind turbines, the generation of seismic waves according to soil type based on Korea's domestic regulations, and load calculation considering earthquake conditions were performed according to the IEC standard, and load in the main coordinate system of the fixed offshore wind turbine was calculated. By comparing the calculated load with the design load of the fixed offshore wind turbine, the effect of earthquake loads according to soil type on the main components of fixed offshore wind turbines was evaluated. As a result of the evaluation, when an earthquake load on a wind turbine is considered, the effect of the earthquake load is related to the natural frequency of the major components and the magnitude of the adjacent acceleration in the earthquake response spectrum, and the earthquake load differs according to soil type and may exceed the design load.

Fiber Optic Temperature Sensor Based on the Thermal Expansion Effect of Fused Optical Fiber Coupler Fixed on a Al Support (알루미늄 지지대에 고정된 융착 광섬유 커플러의 열팽창을 이용한 온도 센서)

  • Kim, Kwang Taek
    • Journal of Sensor Science and Technology
    • /
    • v.26 no.5
    • /
    • pp.338-341
    • /
    • 2017
  • We have investigated a temperature sensor on a thermal expansion effect of a fused optical fiber coupler. Both side of the fused tapered region of the coupler were fixed on a metal support to induce the high thermal expansion effect. The sensor showed that the peak coupling wavelengths were shifted to shorted wavelength region with increased of environmental temperature. The sensitivity of the sensor was $0.12nm/^{\circ}C$.

The Public and Private Sector Wage Gap Trend in Korea - New evidence from the fixed effect analysis - (고정효과 분석을 이용한 공무원과 민간부문 임금격차 추세 추정)

  • Han, Jong-suk
    • Journal of Labour Economics
    • /
    • v.40 no.1
    • /
    • pp.69-97
    • /
    • 2017
  • This paper estimates the public and private sector wage gap trend from 2000 to 2014 using 'Korean Labor and Income Panel Study.' We account for unobserved fixed effect by using 1st differencing log wage in order to allow the gap to vary over time. Standard OLS estimates present the public sector wage is 10% higher than private sector on average. Moreover, the public sector wage premium displays the inverted V shape: sharply increasing up to 2006 and decreasing from 2007 to 2014. However, after controlling unobserved fixed effect, the public sector wage premium disappears and does not display the inverted V shape any more.

  • PDF

Affecting Discharge of Flood Water in Paddy Field from Selecting Rainfall with Fixed and Unfixed Duration (고정, 임의시간 강우량 선택에 따른 농경지 배수 영향 분석)

  • Hwang, Dong Joo;Kim, Byoung Gyu;Shim, Jwa Keun
    • KCID journal
    • /
    • v.19 no.1
    • /
    • pp.64-76
    • /
    • 2012
  • Recently, it has been increased disaster of crops and agricultural facilities with climate change such as regional storm, typhoon. However agricultural facilities have unsafe design criteria of improving drainage corresponding to this change. This study has analyzed the impact that inundation area and magnitude of drainage-facility is decided based on fixed- and unfixed-duration precipitation by applying revised design criteria of drainage for climate change. The result was shown that 1-day and 2-days rainfall for 20-years return period has increased about 11.4%, 4.4% respectively by changing fixed- to unfixed duration. And the increase rate of design flood was 15.0%. The result was also shown that Inundation area was enlarged by 6.6% as well as increased inundation duration under same basic condition in designed rainfall between fixed- and unfixed-duration. According to the analysis, it is necessary for pump capacity in unfixed-duration to be increased by 70% for same effect with fixed-duration. Therefore, when computing method of probability precipitation is changed from fixed one to unfixed-duration by applying revised design criteria, there seems to be improving effect in drainage design. Because 1440-minutes rainfall for 20-years return period with unfixed-duration is more effective than 1-day rainfall for 30-years return period with fixed-duration. By applying unfixed-duration rainfall, capacity of drainage facilities need to be expanded to achieve the same effects (Inundation depth & duration) with fixed-duration rainfall. Further study is required for considering each condition of climate, topography and drainage by applying revised design criteria.

  • PDF

The Effect of Atractylis Alkaloid on Schedule-Controlled Behavior (창출(蒼朮) Alkaloid 가 Schedule Controlled Behavior 에 미치는 영향(影響))

  • Hong, Sa-Ack;Moon, Dong-Yeon
    • The Korean Journal of Pharmacology
    • /
    • v.4 no.1 s.5
    • /
    • pp.33-36
    • /
    • 1968
  • The effect on schedule controlled behavior and toxicity of Atractylis alkaloid was investigated in the pigeons which were trained on a multiple fixed-ratio fixed-interval schedule of food presentation. Atractylis alkaloid decreased the rate of responding during both the fixed-interval and fixed ratio component of the schedule at 10 mg/kg. Further depression occurred at 30 mg/kg. This 'flat dose-response curve for depression of conditioned behavior was typical of tranquilizers. Conclusively it was suspected that Atractylis alkaloid had major tranquilizing activity.

  • PDF

Effect of private health insurance on health care utilization in a universal health insurance system: A case of South Korea (민간 의료 보험 가입이 의료 이용에 미치는 영향)

  • Lee, You Jin;Lee, Jinhyung
    • Korea Journal of Hospital Management
    • /
    • v.23 no.2
    • /
    • pp.42-53
    • /
    • 2018
  • Purpose: this study investigates the effect of private health insurance on healthcare utilization. Methodology: For the analysis, we employed the three level nested two part model. Findings: the private health insurance adoption was associated with higher health care utilization. In particular, indemnity and fixed insurances adoption was associated with higher probability of outpatient visit, the number of outpatient visit and outpatient cost. While indemnity insurance adoption was associated with higher inpatient admission probability and inpatient days, fixed insurance adoption was associated only with higher inpatient admission probability. Practical Implications: indemnity and fixed insurance adoption were related with the adverse selection as well as moral hazard.