• Korean Journal of Social Welfare
• /
• v.64 no.4
• /
• pp.163-188
• /
• 2012

This study examines recent trends in income inequality among the elderly in Korea. Aggregate income inequality trends are explained by examining evidence from inequality index decomposition by population subgroup and by income source. Data come from Korean Labor and Income Panel Study(KLIPS). The results are as follows. First, elderly income inequality increased from 1999 to 2002, and then decreased until 2008. Second, household composition changes appear to have disequalizing influence. The proportion of elderly people who are economically dependent on non-elderly family member or living with adult children has declined. Equalizing influence of private transfers also decreased between 2002 and 2008. These results indicate that the redistributive role of family has weakened over time. Third, the improvement of education level and changing occupational structure among the elderly household head contributed to increase in elderly income inequality. Fourth, earning's factor share has declined steadily, and the diminishing role of earnings provides equalizing influence on elderly income inequality from 2002 to 2008. Fifth, the impact of recent expansion of social insurance has changed over time. Inequality contribution of social insurance income increased from 1999 to 2002, and then decreased from 2002 to 2008.

• Economic and Environmental Geology
• /
• v.35 no.5
• /
• pp.479-490
• /
• 2002

The aim of this study is to evaluate the contributions of each hydrogeological factors to groundwater recharge ratios in order to determine areal estimates of recharges in entire inland area of South Korea. For this purpose, various statistical analyses and overlay techniques of GIS were conducted fur entire area and 4 river basins of South Korea. As a result, the spatial distribution of recharge, South Korea were visualized.

• Transactions of the Korean Society for Noise and Vibration Engineering
• /
• v.19 no.4
• /
• pp.347-354
• /
• 2009

Frequency analysis is one of the most useful way to analyze response signal for the purpose of grasping the dynamic characteristics of system through Fourier transformation. Although it is very effective way for frequency analysis, it is hard to analyze out a specific sound or vibration component which is correlated with others. In this thesis, source contribution analysis tool for NI-PXI equipment is developed with LabVIEW using coherences of MISO(multiple-input single-output) model. For the purpose of examining propriety of developed tool, simulation is performed with several correlated signals that have different frequency range. After checking the OCF(ordinary coherence function) and PCF(partial coherence function) of the each signal for concerned frequency domain, an experiment is conducted on an evaporator that cause the principal noise of a refrigerator. This developed tool will be expected to build up more convenient and serviceable measurement system.

• Journal of the Korean Society for information Management
• /
• v.34 no.2
• /
• pp.7-26
• /
• 2017

There has been growing interest in the methods for measuring the credits of individual authors in multi-authored research papers in response to the increase of research collaboration. Having a good understanding for academic norms of individual discipline is essential to measure author credit effectively. However, many Korean universities do not consider different norms for determining the order of authors across disciplines. Rather, they tend to use a standardized method to assess the credits of authors in multi-authored papers. Therefore, this study presented some problems of applying a standardized method to measure author credits in multi-authored papers in economics. The findings of this study confirmed the frequent use of alphabetical author order in economics papers; however, many university guidelines for research evaluation do not take account the alphabetical authorship in measuring the credits of authors. The authors suggest the needs for (1) establishment of a clear definition for primary authors, (2) flexibility in assessment methods for author credit, and (3) empirical research on author credit.

• 한국IT서비스학회:학술대회논문집
• /
• 2003.05a
• /
• pp.331-344
• /
• 2003

본 연구는 정보시스템의 평가영역 및 평가지표를 개발하기 위한 것으로 선행연구에 대한 검토를 통하여 정보시스템의 주요 평가영역을 시스템영역, 사용자영역, 조직 및 경영영역, IS의 전략적 기여도 및 IS의 자원관리 적정도의 총 5개 영역으로 범주화하고 각 평가영역별 세부 평가지표를 개발하였다. 본 연구에서 제시한 평가영역 및 세부 평가지표의 타당성을 검증하기 위한 실증분석 자료는 25개 정부기관에서 현재 운영중인 65개 정보시스템들을 대상으로 수집하였다. 분석결과 공공부문 정보시스템의 평가영역은 시스템영역, 사용자영역, 조직 및 경영영역, IS의 전략적 기여도, IS의 자원관리 적정도의 5개의 영역으로 이론적으로 도출된 가설적 모형과 동일한 것으로 확인되었으며, 세부 평가항목에 있어서도 시스템영역의 경우에는 시스템의 질, 정보의 질, 서비스의 질로 구성되는 것으로 나타나 가설적 모형과 일치하였다. 그러나 사용자영역은 원래 2개의 평가항목으로 즉, 인식된 유용성과 사용자 만족도로 구성되는 것으로 당초 추론하였으나 1개의 평가항목(사용자 만족도)으로 통합되는 것으로 나타났다. 아울러 조직 및 경영영역은 내부업무효율성, 고객만족도, 조직혁신, 정보화역량 향상도의 4개 평가항목을 포함하는 것으로 확인되었다. 각 평가영역 및 평가항목을 구성하는 평가지표는 요인분석과 더불어 기준 타당도 분석과 신뢰도 분석을 통해 총 57개의 평가지표가 유의적으로 도출되었다.

• Journal of the Korean Society for Railway
• /
• v.19 no.3
• /
• pp.271-279
• /
• 2016

Pantograph aerodynamic noise is a major cause of noise that occurs when a train is traveling at high speeds. In this study, in order to analyze the contribution of pantograph aerodynamic noise, real train tests using HEMU-430X were carried out. In order to analyze the frequency characteristic of the noise of the pantograph in an actual vehicle, a sound field visualization has been carried out using a 144-channel microphone array at train speeds of 350 and 400km/h. As a result, it was confirmed that the low frequency noise in the 250~400Hz bandwidth provides the main contribution to the pantograph noise. And, in order to estimate the noise contribution of the pantograph, the noise level difference between cases in which the pantograph is ascending and those in which it is descending were compared in single microphone experiments. The frequency analysis in the single microphone tests showed that the bands of 315~400Hz and 1000~1250Hz are the main frequency characteristics of pantograph noise. These results show quite good agreement with those of previous studies and with results of sound field visualization.

• Journal of Astronomy and Space Sciences
• /
• v.23 no.4
• /
• pp.337-344
• /
• 2006

KVN simulation, which is focused on evaluating the impacts of KVN to geodetic VLBI network, was performed. The KVN is under construction with three radio telescopes VLBI system for radio astronomy and space geodesy. To distinguish the impacts of KVN on global and local scale networks, we designed two different sizes of VLBI networks, namely, KVN-Asia and KVN-Pacific. While the former consisted of Far East Asia region VLBI stations, the latter consisted of pacific region VLBT stations. The primary purpose of our simulation is quantitative evaluation of KVN impacts before and after the participation of KVN in the previous two virtual networks. We selected two different sets of parameters to be estimated in the simulation as indices of evaluating estimation precision: station coordinates and EOPs. The station coordinates are evaluating index for KVN-Asia and the EOPs are another evaluating index for KVN-Pacific. From the simulation results of comparisons between evaluating indexes, 50% and 20% of maximum improvements for KVN-Asia and KVN-Pacific were anticipated respectively. We expect that the space geodetic use of KVN will be focused on the several promising research fields which are proposed through the simulation results.

• Journal of Korea Port Economic Association
• /
• v.23 no.4
• /
• pp.49-69
• /
• 2007

The purpose of this study is to analyze contribution factors of economic growth through growth accounting analysis in Korean port-logistics industry. Comparing with the average level of entire industry for 1990-2003, the contributions of total factor productivity and labor in port-logistics industry were high, but that of capital stock was very low. The pattern of growth in Korean port-logistics industry has greatly changed before and after Korean financial crisis. Before the 1997 financial crisis, the economic growth rate of port-logistics industry was 14.1%, which is higher than that of the whole industries, 7.7% for 1990-1998. Main contribution factors of the economic growth rate were the growth of capital stock and productivity, but ratios of their contributions were relatively low and did not come up to that for the whole industry. After the financial crisis, annualized growth rate of GDP in port-logistics industry had rapidly declined at 5.4% for 1998-2003, which did not get to that of the entire industry (10.1%). The main contribution factors of the economic growth rate over the 1998-2003 period were capital stock 13.1%, labor 57.0 %, and total factor productivity 29.9 %, Such growth pattern as excess dependence on growth of labor brought reduction of the rate of economic growth with degradation of productivity growth in the Korean port-logistics industry.

• Journal of Ocean Engineering and Technology
• /
• v.26 no.4
• /
• pp.70-76
• /
• 2012

The independent component analysis (ICA) technique is a source identification method that uses statistical independence to separate source signals from measured signals. It has been successfully applied to various fields such as medical care and communication. In this study, the ICA technique was adopted to analyze the vibration source contribution of plate structures. The theory of the ICA technique is introduced and the procedure of the vibration source contribution analysis based on the ICA technique is proposed. To investigate the applicability of the proposed method to plate structures, numerical examples are presented for a rectangular plate under harmonic force excitations. The results show that the proposed method could become an effective tool for the vibration source contribution analysis of a plate structure.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2011.11a
• /
• pp.1191-1194
• /
• 2011

스타의 대중에 대한 인기가 브랜드의 이미지 제고와 상업적 영향을 끄는 마케팅 전략을 스타 마케팅이라고 한다. 오늘날의 스타는 방송, 연예활동뿐만 아니라 스포츠, 정치활동, 사회기여활동 등 다양한 분야에서 활약하며 스타의 이미지는 그 활약상에 영향을 받는다. 스타의 이미지는 브랜드 및 기업의 이미지로 직결되므로 그에 대한 사전분석은 마케팅에서 중요한 요소이다. 그래서 일반적으로 스타들이 활약하는 도메인을 분류하여서 그 스타에 대해서 검색을 하였을 때 어떤 분야에서 활약하고 기여를 하는지 그 기여도를 도메인에 따라 랭킹을 매기는 방법을 제안한다. 뉴스기사에서 텍스트 마이닝 기술을 이용하여 스타의 이름과 활동 도메인들에 대해서 관련단어를 빈도에 따라 추출한다. 그리고 관련된 단어들을 이용하여 스타에 대한 뉴스 중 각 도메인과 관련된 기사들을 카운트하며 도메인에 대해서 긍정 혹은 부정적인 보도내용일 경우에는 극성을 부여하여 그 가중치를 달리한다. 빈도 및 극성을 고려한 점수화에 의해 스타가 기여하는 분야에 대한 순위를 매긴다.