• Title, Summary, Keyword: 1971-2005

Search Result 49, Processing Time 0.043 seconds

A Comparative Study of Determining the Number of Clusters with a Method Proposed (군집수의 예측에 관한 방법의 제안 및 비교)

  • Chae, Seong-San;Lim, Nam-Kyoo
    • The Korean Journal of Applied Statistics
    • /
    • v.18 no.2
    • /
    • pp.329-341
    • /
    • 2005
  • A method of determining the number of clusters is proposed based on some asymptotic results on the Rand's(1971} $C_k$, k = 2, 3, . . ., N - 1, statistic. Simulation is conducted to compare the proposed method with Chae and Warde(1991), and Huh and Lee(2004).

Mortality of Major Cancers in Guangxi, China: Sex, Age and Geographical Differences from 1971 and 2005

  • Deng, Wei;Long, Long;Li, Ji-Lin;Zheng, Dan;Yu, Jia-Hua;Zhang, Chun-Yan;Li, Ke-Zhi;Liu, Hai-Zhou;Huang, Tian-Ren
    • Asian Pacific Journal of Cancer Prevention
    • /
    • v.15 no.4
    • /
    • pp.1567-1574
    • /
    • 2014
  • The incidence and mortality rates of liver and nasopharyngeal cancer in Guangxi province of China have always been among the highest in the world, and cancer is one of the major diseases that pose a threat to the health of residents in Guangxi. However, no systematic study has been performed to evaluate the time trends in the structure of cancer-related deaths and cancer mortality. In this study, we reveal sex, age and geography differences of cancers mortality between three death surveys (1971 to 1973, 1990 to 1992, and 2004 to 2005). The results show that the standardized mortality rate of cancer in Guangxi residents has risen from 43.3/100,000 to 84.2/100,000, the share of cancer deaths in all-cause deaths has increased from 13.3% to 20.7%, and cancer has become the second most common cause of death. The five major cancers, liver cancer, lung cancer, gastric cancer, nasopharyngeal cancer and colorectal cancer, account for 60% of all the cancer deaths. Cancers with growing mortality rates over the past 30 years include lung cancer, colorectal cancer, liver cancer and female breast cancer, of which lung cancer is associated with the sharpest rise in mortality, with a more than 600% rise in both men and women. Cancer death in Guangxi residents occurs mainly in the elderly population above 45 years of age, especially in people over the age of 65. The areas with the highest mortality rates for liver cancer and nasopharyngeal cancer, which feature regional high incidences, include Chongzuo and Wuzhou. Therefore, for major cancers such as liver cancer, lung cancer, gastric cancer, nasopharyngeal cancer and female breast cancer in Guangxi, we can select high-risk age groups as the target population for cancer prevention and control efforts in high-prevalence areas in a bid to achieve the ultimate goal of lowering cancer mortality in Guangxi.

Analysis of Correlation Endwinding Breakdown and Insulation Test for Stator winding of Hydro-Generator (수력발전기 고정자권선의 단말부 절연파괴와 절연특성시험과의 관련성 분석)

  • Lee, D.L.;Lee, K.H.;Choi, K.N.;Kim, H.L.;Oh, B.K.
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.103-105
    • /
    • 2005
  • The test were performed to analyze the cause of endwinding breakdown of hydro-generator which had been in service after being constructed 1971. we conducted insulation diagnostic tests and checked visual inspection and operating condition of protective relays. On the basis of these test results, this paper tried to present the importance of service environment for the generator stator winding.

  • PDF

The Test of Stochastic Convergence of Environment Emission and Environmental Kuznets Curve Hypothesis in Asian Developing Countries (아시아 국가들 환경오염배출량의 확률수렴성과 환경쿠즈네츠곡선가설 검정)

  • Kim, Ji Uk
    • Environmental and Resource Economics Review
    • /
    • v.19 no.3
    • /
    • pp.571-595
    • /
    • 2010
  • This research applies an panel data stationarity and stochastic convergence test developed by Carrion-i-Silvestre et al. (2005), which has the advantage of considering multiple structural breaks and the presence of cross-section dependence in order to investigate the hypothesis that relative emission $CO_2$ per capita stochastically converge for 11 Asian countries from 1971~2007. We find that relative emission $CO_2$ per capita is stationary after the structural breaks and cross-section dependence are introduced into the model. We also investigate whether Environmental Kuznets Curve (EKC) hypothesis exists in 11 Asian countries. For EKC test, using the panel cointegration tests of Banerjee and Carrion-i-Silvestre (2006) and Westerlund and Edgerton(2007), we find that relative emission $CO_2$ per capita and relative GDP per capita are cointegrated. However EKC hypothesis in 11 Asian countries is not supported.

  • PDF

Changes in Labor Force Participation of Married Women in Korea: 1980-2005 (기혼 여성의 경제활동참가 행동변화 분석: 1980-2005)

  • Kwon, JungHyun
    • Journal of Labour Economics
    • /
    • v.31 no.2
    • /
    • pp.129-156
    • /
    • 2008
  • This paper investigated labor force participation pattern changes of married women from 1980 to 2005. Using the micro samples of Population and Housing Census provided by the Korean National Statistical Office, the following results were obtained. The labor force participation rate of married women has substantially increased from 1980 to 2005, with some significant changes in labor supply pattern worthy of note. The most important finding concerns the highly educated women's and younger cohorts' labor supply patterns. Labor force participation rate rapidly increased among college educated married women and wives of college educated men. This is different from the stylized fact associated with married women's labor in Korea, that is, "More educated, less work." This change is more obvious among recent cohorts born from 1971-1975 and from 1976-1980. In contrast to the spouses who trigger less of an influence on married women's labor, the presence of children still proved to be a critical component.

  • PDF

Stochastic analysis of fluid-structure interaction systems by Lagrangian approach

  • Bayraktar, Alemdar;Hancer, Ebru
    • Structural Engineering and Mechanics
    • /
    • v.20 no.4
    • /
    • pp.389-403
    • /
    • 2005
  • In the present paper it is aimed to perform the stochastic dynamic analysis of fluid and fluidstructure systems by using the Lagrangian approach. For that reason, variable-number-nodes twodimensional isoparametric fluid finite elements are programmed in Fortran language by the authors and incorporated into a general-purpose computer program for stochastic dynamic analysis of structure systems, STOCAL. Formulation of the fluid elements includes the effects of compressible wave propagation and surface sloshing motion. For numerical example a rigid fluid tank and a dam-reservoir interaction system are selected and modeled by finite element method. Results obtained from the modal analysis are compared with the results of the analytical and numerical solutions. The Pacoima Dam record S16E component recorded during the San Fernando Earthquake in 1971 is used as a ground motion. The mean of maximum values of displacements and hydrodynamic pressures are compared with the deterministic analysis results.

Mortality Forecasting for Population Projection (장래인구추계를 위한 사망률 예측)

  • Kim, Tai-Hun
    • Korea journal of population studies
    • /
    • v.29 no.2
    • /
    • pp.27-51
    • /
    • 2006
  • In this paper, I have tested various kinds of methods for mortality projection and chose Lee-Carter method for projection of Korean mortality by age and sex. I reviewed the trends of life tables and life expectancies by age and sex from 2005 to 2050 projected by Lee-Carter method and found that the method was very applicable for Korean mortality projection. The differences between reported and estimated data for the period of 1971-2003 were small enough for both sexes and for all of the age groups. The projected life expectancies in 2051 were 82.73 years for males and 89.41 for females, and the differences decreased from 7.06 years in 2005 to 6.68 years. Because of the limitation of Korean infant mortality rate, I adopted the Japanese estimated IMR in 2050 as Korean object level in 2051. When the time series of IMR become long enough, we can use Korean IMR directly for the mortality projection. In addition, if we can estimate the changes of the main cause of death correctly in future, the mortality projection will be more correct and reliable. This will be available when we can produce a long series of life tables by cause of deaths.

Analysis of Patents on the Recycling Technologies for Waste Batteries (폐전지 재활용 관련 기술의 특허 동향분석)

  • Kang Tae-Won;Jeong Jinki;Lee Jae-Chun;Sohn Jeong-Soo;Kang Kyung-Seok
    • Journal of the Korean Institute of Resources Recycling
    • /
    • v.14 no.6
    • /
    • pp.44-59
    • /
    • 2005
  • In this paper the world wide patents on the recycling of used batteries were inspected. The trend and direction of on-going and future technologies on this matter were analyzed. The range of search was limited in the open patents and in DB of U.S.A.(USPTO, DLPHION), Japan(PAJ), Europe(EPO), and Korea(KIPRIS). For the search condition the keyword, battery, batteries, electric cell, patent, and recycling, and IPC classification were used. The total of 2,490 cases was found at the first search stage, then, through the 2 steps of filtering processes the total of 871 cases was selected for the final analysis. These 871 cases were classified by countries, companies, and technologies between the year 1971 and the you 2000.

A Statistical Approach to Examine the Impact of Various Meteorological Parameters on Pan Evaporation

  • Pandey, Swati;Kumar, Manoj;Chakraborty, Soubhik;Mahanti, N.C.
    • The Korean Journal of Applied Statistics
    • /
    • v.22 no.3
    • /
    • pp.515-530
    • /
    • 2009
  • Evaporation from surface water bodies is influenced by a number of meteorological parameters. The rate of evaporation is primarily controlled by incoming solar radiation, air and water temperature and wind speed and relative humidity. In the present study, influence of weekly meteorological variables such as air temperature, relative humidity, bright sunshine hours, wind speed, wind velocity, rainfall on rate of evaporation has been examined using 35 years(1971-2005) of meteorological data. Statistical analysis was carried out employing linear regression models. The developed regression models were tested for goodness of fit, multicollinearity along with normality test and constant variance test. These regression models were subsequently validated using the observed and predicted parameter estimates with the meteorological data of the year 2005. Further these models were checked with time order sequence of residual plots to identify the trend of the scatter plot and then new standardized regression models were developed using standardized equations. The highest significant positive correlation was observed between pan evaporation and maximum air temperature. Mean air temperature and wind velocity have highly significant influence on pan evaporation whereas minimum air temperature, relative humidity and wind direction have no such significant influence.