• Journal of Korea Port Economic Association
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• v.32 no.2
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• pp.59-71
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• 2016

This study empirically examines the dynamic specification of the ship price model based on a vector autoregressive model and data covering from January 2000 to October 2014. Our results are summarized as follows: first, the relationship between ship price and interest rate shows significantly negative and the relationship between ship price and freight rate shows positive. It provides consistent implication that ship price depends on interest rate and freight rate under the dynamic Gordon model. Second, we apply an impulse response analysis to ship price and find the responses of the ship price from both factors, interest rate and freight rate, which affect during seven periods approximately. Finally, the results of a variance decomposition indicate that freight rate is more important than interest rate on the ship price.

• Geophysics and Geophysical Exploration
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• v.8 no.2
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• pp.129-136
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• 2005

The damped least-squares inversion has become a most popular method in finding the solution in geophysical problems. Generally, the least-squares inversion is to minimize the object function which consists of data misfits and model constraints. Although both the data misfit and the model constraint take an important part in the least-squares inversion, most of the studies are concentrated on what kind of model constraint is imposed and how to select an optimum regularization parameter. Despite that each datum is recommended to be weighted according to its uncertainty or error in the data acquisition, the uncertainty is usually not available. Thus, the data weighting matrix is inevitably regarded as the identity matrix in the inversion. We present a new inversion scheme, in which the data weighting matrix is automatically obtained from the analysis of the data resolution matrix and its spread function. This approach, named 'extended active constraint balancing (EACB)', assigns a great weighting on the datum having a high resolution and vice versa. We demonstrate that by applying EACB to a two-dimensional resistivity tomography problem, the EACB approach helps to enhance both the resolution and the stability of the inversion process.

• The Korean Journal of Applied Statistics
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• v.37 no.4
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• pp.509-523
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• 2024

This study estimates connectedness index among the US, China, Europe, Japan, and South Korea using monthly economic policy uncertainty (EPU) data from January 2000 to December 2023. The connectedness index allows us to analyze the effect of global economic uncertainty on domestic economic uncertainty. The EPU is used as a proxy for economic uncertainty. Inter-country connectedness index is computed from variance decomposition. The findings from forecast error variance decomposition show that three-fourths of total uncertainty comes from economic uncertainty in the own country and one-fourth of total uncertainty comes from economic uncertainty in the others. The analysis on net pairwise connectedness reveals that, even though the extent of the effect of economic uncertainty in one country from economic uncertainty in another country varies over time, economic uncertainty in South Korea, a small-open economy, is mainly affected by economic uncertainty in the others. The reverse situation rarely happens except in the specific occurrence such as the collapse of the credit bubble in 2003 and the subsequent years, the inter-Korean summit and North Korea-the US summit in 2018, and the period from the first outbreak of COVID-19 on the implementation of the government's severe regulation against COVID-19.

• Environmental and Resource Economics Review
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• v.15 no.5
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• pp.799-826
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• 2006

Combining recent advances in causal flows with time series analysis, relationships among eight North American natural gas spot market prices are examined. Results indicate that price discovery tends to occur in excess demand regions and move to excess supply regions. Across North America, the U.S. Midwest region represented by Chicago spot market is the most important market for price discovery. The Ellisburg-Leidy Hub in Pennsylvania is important in price discovery, especially for markets in the eastern two-thirds of the U.S. Malin Hub in Oregon is important for the western markets including the AECO Hub in Alberta, Canada.

• Environmental and Resource Economics Review
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• v.12 no.2
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• pp.327-346
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• 2003

Unlike previous studies on the causal relationship between energy consumption and economic growth, this paper analyses the dynamic causal relationship between these variables using the dynamic vector using Johansen's multiple cointegration procedure, dynamic vector error-correction model and impulse response function. The empirical results show that while the energy consumption to a shock in income responds positively, the income responds positively to the shocks in energy consumption in the first place and then the responses become negative. We also find that the impact of energy consumption shock on the income is short-lived and causes higher inflationary pressure.

• Journal of Korea Port Economic Association
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• v.27 no.2
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• pp.27-38
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• 2011

The paper aims at examining the behavioral characteristics of the passenger car export of Gunsan, Pyeongtaek, and Ulsan port. This is accomplished by modelling export demand as exchange rate and the Unites States industrial production. All series span the period January 2001 to December 2010. I first show that both the series and the residuals are stationary at the 5 percent significance level. The result cannot reject the null hypothesis of a unit root in each of the level variables and of a unit root for the residuals from the cointegration regression at the 5 percent significance level. I hitherto make use of forecast error decomposition and historical decompositions The forecast error decomposition indicates that car export is endogenous to industrial production and exchange rate. The historical decompositions for the export show that the entire difference between actual export and the base forecast can be attributed to industrial production shocks since exchange rate moves closer to the actual data or the base forecast. It indicates that industrial production outperforms exchange rate in explaining the passenger car exports.

• The Korean Journal of Financial Management
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• v.20 no.2
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• pp.181-200
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• 2003

Comovement of international stock market prices has been lately a major controversy in the global stock market. This paper explores whether the common trend has really existed among the US, Japan and Korea's stock markets using the econometric techniques such as VAR, VECM as applied. Pair of indices from the exchange market and the over-the-counter market in each country has been tested, and the exchange market only has been turned out that the common trend existed. The dynamic analyses using the Granger causality test, impulse response function, and the forecast error decomposition have followed to show that the US stock market has played some important role in the Korea and Japan's market in the exchange as well as in the OTC market. The results of the paper imply that the more careful investigation with respect to the co-integration may be necessary in the global market integration studies.

• The Korean Journal of Financial Management
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• v.10 no.2
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• pp.137-159
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• 1993

본 연구에서는 우리나라의 금융자산, 특히 회사채와 주식이 인플레이션과 관련하여 어떠한 행태를 보이는가를 실증적으로 살펴본다. 1976년부터 1992년까지의 기간중 채권 및 주식수익률에 피서가설이 성립하는가의 여부, 주식수익률과 기대인플레이션과 관련된 Fama의 허구성가설 및 Geske & Roll의 역인과성가설 등을 공적분관계검정 및 VAR모형의 예측오차 분산분해등을 통하여 포괄적으로 결정한다. 이를 위하여 본 연구는 다음과 같은 순서로 진행하였다. 첫째, 단순정태회귀분석을 통하여 우리나라 금융시장에서 주식이나 채권이 기대된 인플레이션이나 예상치 못했던 인플레이션에 대해 얼마나 인플레이션방어수단으로 유효한지를 살펴보았다. 우선, 회사채수익률의 경우 피서가설의 성립을 기각하기 어려웠다. 반면, 주식의 경우에는 피서가설이 성립될 수 없음은 물론이고, 대부분의 선진국가들처럼 기대인플레이션에 주식수익률이 만대방향으로 반응하는 것으로 나타났다. 주식수익률을 설명하는 변수에 예상되는 산업생산증가나 통화량증가를 나타내는 변수들을 추가하여도 주식수익률과 기대인플레이션간의 부의 관계는 여전히 유의적인 것으로 남아있었다. 따라서 파마의 주식수익률과 기대인플레이션간의 허위관계가설은 우리나라 주식시장에서는 적용되지 않는 것으로 나타났다. 둘째, 단순정태분석에서 활용된 여러 회귀식들이 가성적회귀관계(假性的回歸關係)를 나타내는 경우를 확인하기 위하여 공적분관계가 형성되는지를 검정하였다. 그 결과, 회사채수익률과 인플레이션은 공적분관계가설이 기각되지 않았으나, 주식수익률과 기대인플레이션간에는 공적분관계가 나타나지 않았다. 공적분관계에 입각하여 오차수정모형을 추정한 결과, 회사채수익률의 변화는 단기적인 인플레이션의 동태를 예측하는데 있어서 도움을 주지만, 기대인플레이션 및 예상산업생산증가률의 변화는 주식실질수익률의 단기적 동해예측에 개별적으로는 도움이 되지 못하였다. 마지막으로 여러 변수들의 관계를 사전적으로 설정하지 않고 VAR 모형의 오차분해를 통하여 인과관제를 분석한 결과, 주식수익률과 기대인플레이션이 허구적(虛構的)인 관계가 아님을 시사하고 있다. 그러나, 주식수익률변동은 예상산업생산증가에 의하여 어느정도 설명이 가능하고 대부분의 경제변수에 대하여는 외생적인 성격을 강하게 보여주고 있어서, 기대인플레이션과의 인과관계에 있어서도 선행적인 위치를 지지하고 있다.

• Journal of Korea Port Economic Association
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• v.23 no.4
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• pp.159-175
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• 2007

The purpose of this study is to examine the causal relationship between trading volume of freight and industrial growth in Korea ports, and to induce policy implications. In order to test whether time series data is stationary and the model is fitness or not, we put in operation unit root test, cointegration test. And we apply Granger causality based on an error correction model, Hsiao(1981) method and variance decomposition. The results indicate that the extent of causality between trading volume of freight and industrial growth is strong in order of Incheon port, Busan port, Gwang Yang port, Ulsan port. We can infer policy suggestions as follows; The port policy of government must be focused on re-adjusting investment among Korea ports and raising competitive power of Korea ports

• Journal of the Korean Data and Information Science Society
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• v.22 no.3
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• pp.401-412
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• 2011

This study uses a vector error correction model to analyze the daily time series data of the spot price of EUA (European Union Allowance). As endogenous variables, five variables are considered for the analysis, including prices of crude oil, natural gas, electricity and coal in addition to carbon price. Data period is Phase 2 period (April 21, 2008 to March 31, 2010) to avoid Phase 1 period (2005-2007) where the EUA prices were distorted. Unit-root and cointegration test results reveal that all variables have a unit root and cointegration vectors exist, so a vector error correction model is adopted instead of a vector autoregressive model.