• 환경위생공학
• /
• 제8권2호
• /
• pp.155-168
• /
• 1993

The chemical components of rain water and aerosol in Bulkwang of Seoul and Yang-Paying of Kyunggi-do were compared in order to investigate that pollutants at urban area influences rain water and aerosol component. The following is the result of this study. 1) The pH of rain water was shown 4.82 at urban area and 5.69 at suburban area. 2) The mean concentration of $SO_4^{2-}$ within rain water at suburban was nearly the same at urban area but the mean concentration of $Na^{+},Ca^{2+},Mg^{2+}$ and $NH_4^{2+}$ at suburban area was higher than the corresponding levels at urban area. 3) The ion component of aerosol at suburban was shown 68% of that at urban area. This study proved that the concentration of rain water and aerosol component was under the influence of movement of air current.

• 한국유체기계학회 논문집
• /
• 제9권6호
• /
• pp.22-28
• /
• 2006

Operation of a microturbine was simulated on the basis of component characteristic parameters obtained from performance test. Characteristic parameters, such as compressor and turbine efficiencies, recuperator effectiveness as well as turbine inlet temperature, were obtained for a wide operation range. Component characteristics including performance maps and characteristic curves were generated using measured data. Based on the component characteristics, a simulation program was constructed and operation of the microturbine was simulated, and the simulated results were compared with the measured data to verify the program. Also, influence of variation in the power control scheme on the operating characteristic and performance of the engine was simulated. The simulation program can be used for predicting operation of both healthy and degraded engine conditions.

• The Journal of Korean Physical Therapy
• /
• 제14권3호
• /
• pp.308-322
• /
• 2002

The purpose of this study was to investigate the influence of the Cardiopulmonary function and Blood component to aerobic exercise. This were measured performance for 15 minutes. This study included 14 healthy individuals, 7 males and 7 females who were aged from 19 to 25 years. 1. After exercise heart rate was increased by on average of 93.7 beat/min as compared with rest. 2. Before exercise breath rate increased compared with rest and normal recovery need more 10 minutes. 3. Breathing capacity increased compare before with after perfoming exercise and male was less increase than was female. 4. Blood component(WBC, RBC, HB, HCT) showed aslight increased of difference compare before with after perfoming exercise.

• 대한산업공학회지
• /
• 제40권2호
• /
• pp.205-214
• /
• 2014

As a result of the rapid economic growth and birth control policy, China is experiencing low fertility rates and increasing life expectancy, which makes Chinese population aging very quickly and unprepared for their retired life. The reverse mortgage may be an attractive option for the elderly because it is a loan against a house that they do not have to pay back as long as they live there. In this paper, in order to introduce the reverse mortgage scheme in China the factors that could influence the demand of reverse mortgage are reviewed and the Chinese market environment is analyzed. Then the principal component analysis is performed in order to recommend the regions or cities that have higher potential for successful implementation of a reverse mortgage than any other ones in China.

• 응용통계연구
• /
• 제7권2호
• /
• pp.213-224
• /
• 1994

두개의 공분산 행렬의 동질성을 검정하는데 있어서, influence curve 방법을 이용하여 outlier를 찾는데 유용한 진단법을 제시한다. 이러한 진단법은 두개 이상의 공분산 행렬의 경우에 쉽게 일반화된다. 경험적 분포함수에 입각한 진단법의 sample version을 고려하며, 이것은 Wilks가 제안한 한개의 outlier를 찾는데 필요한 통계량과 두개의 모집단의 경우로 일반화된 Wilks 통계량을 포함한다.

• Spatial Information Research
• /
• 제21권3호
• /
• pp.71-78
• /
• 2013

자전거 이용 활성화에 따라 지속적인 자전거 이용 시설물 관리가 필요한 실정이다. 기존 연구에서는 이용자 또는 전문가들의 설문을 중심으로 자전거 이용 환경 평가를 하여 결과를 얻었다. 본 연구는 자전거 이용 시설물들을 균형적으로 조성할 수 있도록 정량적인 평가지표를 설정하여 평가하고자 한다. 기존 연구에서 제시된 자전거 이용 환경 평가지표를 토대로 자전거 이용자들이 이용 가능하며 정량화할 수 있는 이용 시설물 변수를 도출하였으며 시설물의 단위를 설정하였다. 평가를 위해 대상지를 송파구 역세권으로 선정하였다. 분석방법은 첫째, 사분면을 변형한 '자전거도로-시설물' 분석을 실시하였다. 이를 통해 개별적인 시설물 현황 및 역세권을 상대적으로 파악하였다. 둘째, 주성분분석을 실시하여 자전거 이용 시설물들을 전체적으로 통합하여 분석하였다. 이를 통해 시설물 변수들 중 공통적인 성질을 갖고 있는 변수들로 그룹화하여 비슷한 유형의 역세권을 파악하였으며 그룹별로 순위를 선정하였다.

• 한국정보과학회논문지:소프트웨어및응용
• /
• 제31권8호
• /
• pp.1043-1053
• /
• 2004

컴포넌트 기반 소프트웨어에서는 사용될 컴포넌트의 성능이 개발되는 소프트웨어의 품질 확보에 있어서 매우 중요한 요소이다. 컴포넌트 성능에는 흔히 컴포넌트 모델이나 미들웨어에 종속적인 성능측정 도구가 이용된다. 이러한 성능측정 방법에서는 소프트웨어의 개발환경이 변경될 경우 측정 도구도 함께 수정되어야 한다는 문제점을 가지고 있다. 또한, 여러 가지 다른 모델의 컴포넌트들을 한 시스템으로 통합하는 경우에도 유사한 어려움이 존재한다. 본 논문은 이러한 문제에 대한 해결 방법으로 컴포넌트 모델이나 미들웨어에 독립적인 성능측정 방법을 제안한다. 제안된 방법은 미들웨어에 공통적으로 적용 가능한 성능측정기 모델에서 특정 미들웨어를 위한 성능측정기 모델로의 모델변환 과정을 통해 성능데이타간의 상호운용성을 보장한다. 이 방법을 이용하면 동일한 컴포넌트 모델에 따른 컴포넌트들뿐만 아니라 서로 다른 컴포넌트 모델을 기반으로 하는 컴포넌트들에 대한 성능측정이 가능하다.

• 천문학회지
• /
• 제29권spc1호
• /
• pp.27-29
• /
• 1996

We describe the formation of large-scale inhomogeneous structure of expa-nding Universe on the basic of two components system-usual nonrelativistic particles and dark matter, with taking into account their interaction.

• Communications for Statistical Applications and Methods
• /
• 제6권3호
• /
• pp.667-676
• /
• 1999

We investigate the effects of omission of initial observations in each individuals in the panel data regression model when the disturbances follow a serially correlated one way error components. We show that the first transformed observation can have a relative large hat matrix diagonal component and a large influence on parameter estimates when the correlation coefficient is large in absolute value.

• 조명전기설비학회논문지
• /
• 제27권2호
• /
• pp.62-68
• /
• 2013

The dynamic voltage restorer (DVR) is an effective protection device for wind turbine generators based on doubly-fed induction generator (DFIG) that is operated under unbalanced voltage dip conditions. The compensating voltages of the DVR depend on the voltage dips and on the influence of the zero sequence component. The zero sequence component results in high insulation costs and asymmetry in terminal voltages. This paper proposes the use of a proportional-resonant controller in stationary reference frames for controlling zero sequence components in the DVR to protect the DFIG during unbalanced voltage dips. To enhance the proposed control method, a comparison is carried out between two cases: with and without using the control of a zero sequence component. Simulation results are presented to verify the effectiveness of the proposed control method by using the Psim simulation program.