• Journal of Labour Economics
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• v.43 no.2
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• pp.109-133
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• 2020

This paper estimates a matching function in Korea by using the method of Borowczyk-Martins et al. (2013) in order to mitigate endogeneity problems. The endogeneity was controlled through the GMM estimation by approximating the unobserved matching efficiency with the ARMA(p,q) process. The monthly data from the Economically Active Population Survey and Labor Force Survey at Establishments from June 2009 to December 2019 were used for the estimation. The matching elasticity that indicates the elasticity of new hires with respect to vacancies was estimated to be 0.859. When excluding 2019 samples, which had a large number of direct jobs provided by the government, the matching elasticity was lowered to 0.755, but still higher than that of other countries.

• Korean Journal of Social Welfare
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• v.65 no.4
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• pp.7-31
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• 2013

School adjustment has been a popular topic among scholars in multicultural family studies, and they commonly report poor adjustment of children from multicultural families. However, without subjects for comparison, these findings may be considered premature. This study investigated school adjustment of children from multicultural families by comparing their adjustment level to that of children from families with Korean parents. By using the matching procedure, this study examined whether children's multicultural family background attributes to their school adjustment with children's observable characteristics paired and matched. For the analyses, the first and fourth wave of Korean Children and Youth Panel Study data were used. When the school adjustment level was examined before the matching procedure, the school adjustment level was indeed lower among children of multicultural families, and their family status was a significant predictor of school adjustment. However, when two groups were paired and matched using matching, the family background had no significant effect, indicating that school adjustment is not predicted by their multicultural family status. Implications for research and practice are also discussed in the paper.

• The KIPS Transactions:PartB
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• v.9B no.5
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• pp.571-578
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• 2002

In this paper, we propose a video sequence coding scheme called AMV (Auxiliary Motion Vector) to minimize error propagation caused by transmission errors over the Internet. Unlike the conventional coding schemes the AMY coder, for a macroblock in a frame, selects two best matching blocks among several preceding frames. The best matching block, called a primary block, is used for motion compensation of the destination macroblock. The other block, called an auxiliary block, replaces the primary block in case of its loss at the decoder. When a primary block is corrupted or lost during transmission, the decoder can efficiently and simply suppress error propagation to the subsequent frames by replacing the block with an auxiliary block. This scheme has an advantage of reducing both the number and the impact of error propagations. We implemented the proposed coder by modifying H.263 standard coding and evaluated the performance of our proposed scheme in the simulation. The simulation results show that AMV coder is more efficient than the H.263 baseline coder at the high packet loss rate.