• Proceedings of the Korea Water Resources Association Conference
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• 2017.05a
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• pp.248-248
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• 2017

최근 가뭄 모니터링을 위해 과거에 비하여 고해상도의, 물리적으로 기반을 두는 정보가 요구되고 있다. 기존에 주로 활용하고 있는 통계적 방법론 기반의 가뭄지수들은 지니고 있는 한계에 대해 여러 개선과정을 거치고 있으나, 기상변수로부터 지표상의 식생 관련 변수로의 전파 과정에 대한 개별 통계적 가뭄지수 간의 관계 설명이 매우 어렵다. 이와 같은 관계로, 국내 유역에서의 물리적 기반을 둔 고해상도 가뭄 판단방법에 대한 시도가 필요한 시점이다. Brown et al. (2008)은 위성기반 식생정보, 기상학적 가뭄지수, 지형학적 조건을 고려한 식생가뭄반응지수(Vegetation Drought Response Index; 이하 VegDRI)를 개발하였다. 학습자료에 대해 CART 기반의 경험적 모델을 구축하여, 격자마다 근-실시간 자료를 적용한 VegDRI를 산출하여 고해상도의 지도를 산출하는 방식을 제시하였다. VegDRI는 NCDC의 U.S. Drought Monitoring에 활용되고 있으며, NOAA의 Drought Task Force Assessment Protocol에서는 가뭄 모니터링의 기준으로 설정되어 있다. 본 연구에서는 국내에 VegDRI를 적용하고자 필요한 자료수집 및 전처리 과정을 거쳐 결과를 도출하였다. 기상청 ASOS 기상관측소에서 얻은 기상변수, MODIS 위성으로부터 추출된 정규식생지수(Normalized Difference Vegetation Index; NDVI), 지형학적 정보와 기상학적 가뭄지수(SPI, PDSI)를 기계학습으로 모델링하여 VegDRI를 산출하였다. 산출된 VegDRI 공간분포도에 대하여 기존에 활용되던 유관기관의 가뭄 판단방법과의 유사성과 차이점을 비교 검토하여 적용성을 평가하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2019.05a
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• pp.339-339
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• 2019

지구 온난화와 기후변화의 영향으로 태풍의 발생과 집중호우로 인한 홍수피해는 꾸준히 증가하고 있는 실정이다. 이와 같이 홍수와 관련된 강수량은 기상인자 중에서 유역의 유출과 관계가 있고, 유역의 내수침수 등의 도시홍수를 일으키는 원인이 되고 있다. 그러나 본 연구에서는 자료의 경향성을 판단하기 위해 국내 연최대강우자료의 경향성을 분석하였으며, 또한 연최대강우자료의 시간적 특성을 나타내는 지표로써 스케일 지수에 대하여 경향성과 변동성을 분석하였다. 이를 위해 the block bootstrap-based MK (BBS-MK) 분석을 실시하였고, 연최대강우자료로부터 BBS-MK분석에 대한 경향성 분석 결과, 다수 지점의 연최대강우자료에서 경향성이 나타나지 않았으나, 큰 변동성을 확인하였고, 연별 스케일 지수의 변동성 보다 월별 스케일 지수의 변동성 중 우기에 해당하는 월 (6-10월)에 대한 변동성은 크게 나타났다. 스케일 지수의 경향성은 연최대강우자료의 경향성 분석 결과와는 반대로 많은 강우지점에서 경향성이 존재함을 알 수 있었다. 스케일 지수의 경향성 분석 결과, 해안 지역의 강우 관측소에서 감소 경향이 확인되었지만, 내륙 지역에서는 스케일 지수가 증가하는 경향을 확인할 수 있었다.

• Korean Journal of Construction Engineering and Management
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• v.7 no.5
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• pp.77-84
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• 2006

Indexes have played an important role as a economic indicator or performance indicator in many industries for a long time. In construction industry, indexes, or Construction Cost Index(CCI), have been used to compensate for the gap of time in Estimate Using the Historical Cost Data from Feb. 2004. CCI is composed of index formula and resources. Existing literatures had used Laspyeres Index as a index formula. And, Leontief table, the bills of quantities, and information of price surveyor were used as a resource. When applying Laspyeres formula and the resources to calculating the CCI, the problems such as double application of price fluctuation, calculating the incorrect weights, may be generated. This paper analyzed the existing economic relevant indexes as well as Laspyeres formula. Thus, feasibility of them was analyzed using three practical cases of apartments. And then, Quantity based Base Period Price Index(QBPPI) was developed to consider the characteristics of construction more accurately.

• The Korean Journal of Financial Studies
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• v.13 no.1
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• pp.133-160
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• 2007

본 연구는 중국 뮤추얼펀드를 대상으로 폐쇄형(48개), 개방형(17개)으로 구분하여 총 65개 펀드에 대해 성과를 측정해보고, 이를 통해 중국 뮤추얼펀드가 지수대비 어떠한 성과를 보여주고 있는지를 살펴보고자 한 연구이다. 성과 평가 실증기간은 폐쇄형 펀드가 2002년 1월 4일부터 2004년 12월 31일까지 3년으로 하며 개방형 펀드가 2003년 1월 3일부터 2004년 12월 31일까지 2년으로 하였다. 실증연구방법들은 CAPM에 기반한 트레이너 모형, 샤프 모형, 젠센 모형과 장세판단능력 측정 모형인 트레이너-마주이 모형이다.

• Journal of Technology Innovation
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• v.21 no.1
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• pp.85-108
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• 2013

This paper introduces a new qualitative measurement indicator, Relatively Rank-normalized Impact Factor ($R^2nIF$) that can overcome drawbacks of the existing research performance measures. With the help of this innovative indicator, this study analyzes and compares the quality of research papers across countries and National Science Indicators (NSI) standard academic fields. The development of an improved bibliometric indicator for evaluating the quality of research papers and disentangling the "international" dimension of research performance will be of interest to academics and practitioners alike.

• The Journal of the Korea Contents Association
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• v.13 no.3
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• pp.352-361
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• 2013

The purpose of this study is to analyse the impact of macroeconomic and non-macroeconomic forces on the management performance of the air transport firms and offer the useful information to the managers. To conduct the regression analysis, eight macroeconomic and non-macroeconomic variables were selected individually as an independent variable. Macroeconomic variables were the return of corporate bond, West Texas Intermediate, the unemployment rate, the money supply, the trade balance, the won to USD exchange rate, the consumer price index and the index of industrial production. And non-macroeconomic variables were Taiwan earthquake, the Asian economic crisis, the 911 terrorist attacks in the US, the Iraq war, Beijing Olympic, the outbreak of a swine flu epidemic, the 1st presidential election and the 2nd presidential election. And ROA was selected as a dependent variable. As the result of analysis, it was found that the changing rates of won to USD exchange rate and consumer price index affected the changing rate of ROA significantly. And also as the result of analysing the impact of two significant macroeconomic variables and eight non-macroeconomic variables on the changing rate of ROA, it was found that the Asian economic crisis and the outbreak of a swine flu epidemic had a negative impact on it. Therefore managers should take note of a change in macroeconomic and non-macroeconomic variables carefully to improve the management performance.

• Management & Information Systems Review
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• v.37 no.1
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• pp.41-53
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• 2018

This study validates the trading rules based market anomalies and technical analysis in the Korean stock market. For the analysis, we built decile portfolios on the basis of corporate characteristics factors that clearly demonstrate specific patterns of stock returns including the firm size, book-to-market equity, and accruals. This portfolio was used to develop a portfolio based on the moving average trading strategy which was used for popular technical analysis tools, and then that was evaluated using the Sharpe ratio. We also created a zero-cost portfolio to identify the profitability and success rate of the moving average trading strategy. We lastly sought to ensure a more robust evaluation by calculating the Sortino ratio of the portfolio based on the moving average trading strategy with various lags. Key findings from this validation are as follows. First, a smaller firm size, a higher book-to-market equity, and lower accruals led to larger average returns. Second, the risk-adjusted performance of the moving average trading strategy was the highest in terms of the firm size, followed by book-to-market equity and accruals. Third, the returns of the zero-cost portfolios all had a positive value, with its overall success rate hovering over 68.8%, demonstrating the successfulness of the moving average trading strategy. Fourth, various evaluations revealed the economic usefulness of our trading strategy that used market anomalies and technical analysis.

• Journal of Industrial Convergence
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• v.17 no.2
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• pp.29-34
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• 2019

The purpose of this study is to analyze the achievements of employment support by the government support specialization project. The data used in this study are based on the comparison of 5 - year employment support field and the operation results of the program until 2014-2018. The results of the study are as follows. First, the overall employment rate of the university has been continuously increased. Especially, the employment rate of the specialization department has been higher than the employment rate of the non - specialization department. Second, as a result of the analysis of the employment capacity strengthening index and the learning capacity strengthening index, it showed a steady increase in each year and contributed to the cultivation of customized talents required by the local society and the national industry. Third, as a result of analyzing the satisfaction of students who are business users, it was confirmed that the business reflecting the demands of the consumers was realized. Fourth, the continuous improvement of the business and the reflux have made the infrastructure of the employment support project more advanced and the system of supporting employment of the university systematically established. In conclusion, the result of the employment support project according to the specialization program showed excellent results and it is necessary to complement theses results when establishing related business plan in the future.

• Journal of Korea Port Economic Association
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• v.39 no.3
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• pp.191-210
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• 2023

The Covid-19 pandemic has had a significant impact on global logistics and supply chains, leading to major discrepancies in logistics performance across countries worldwide. Through an examination of logistics performance index and supply chain tracking data, this study aimed to identify the changes in global supply chains and logistics environments during the pandemic. The analysis of the logistics performance index showed that overall, countries around the world, especially developed nations, showed improvements in metrics such as customs and border management efficiency, the quality of trade and transport infrastructure, capability and quality of logistics services, and cargo tracking abilities. However, the competitive pricing feasibility of international transportation and the on-time delivery frequency of goods saw a decline due to the pandemic's effects. The supply chain tracking data revealed that ports in Asian countries demonstrated high processing efficiency. In contrast, the U.S. and European countries took comparatively more time. Particularly for air cargo, parcels, and express shipments, the U.S. showed relatively longer processing times, leading to logistical delays. In conclusion, during the Covid-19 pandemic, Asian countries maintained relatively high efficiency in their logistics and trade environments. Conversely, the U.S. and some European countries showed delays and decreased efficiency in various metrics. In the future, efforts should be made to address delays and congestion, namely, the deceleration of logistics processes.

• (The) Korean Journal of Advertising
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• v.29 no.3
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• pp.57-90
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• 2018

This study is aimed at articulating the policy communication concept and developing the policy communication index between the Korean government and the public. Theoretically guided by dialogic communication theory, two step research was employed. In the first stage, the elements of policy communication were derived through literature review and in-depth interviews. In the second stage, online survey was conducted for the general public and reliability and validity were secured through confirmatory factor analysis and structural equation model analysis. The finalized policy communication index has two dimensions of mutuality and openness. The mutuality has six sub dimensions and the openness has three sub dimensions. The level of mutuality and openness of the policy communication index differed according to the policy type. In the cultural policy, which represents the traits of distribution policy, the degree of mutuality was strong, but the degree of openness was important in communication of education policy, which represents the traits of redistribution policy. This study is meaningful as an empirical study that verifies and suggests the influence of the policy communication index in the context of the policy communication and practical applicability to strategic public relations by understanding the dimensions of policy communication.