Network Data Envelopment Analysis를 적용한 생산 및 폐수처리 효율 추정
Efficiency Measurement for Production and Wastewater Abatement Activity Using Network Data Envelopment Analysis: The Case of Korean Industrial Complex
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초록
투입·산출변수의 외생적 흐름에 기초한 전통적인 자료포락분석은 생산활동의 모든 내부과정을 ‘black box'로 간주하며 각 생산단계의 상호작용에 대한 정보를 고려하지 못한 한계를 지닌다. 이에 생산과정을 세분화하고 각 생산단계의 효율성을 연계하여 추정하는 Network DEA 방식이 최근 활발히 적용되고 있으며 특히 환경효율성의 추정과정을 생산 및 저감활동으로 구분한 연구가 대표적이다. 본고는 한국의 51개 산업단지를 대상으로 Network DEA에 기초한 환경효율성 추정을 시도하였으며, 분석결과 추정치의 변별력, 비효율의 발생단계, 기타 외생변수와의 통계적 관련성 등의 관점에서 전통적 DEA 추정결과에 비해 우수한 점을 확인할 수 있었다.
Abstract
In this paper, we present a new empirical method to estimate the environmental efficiency of decision making units. We propose a model with a new approach that describes a network process consisting of two stages, production and wastewater abatement based on the data extracted from 51 Korean industrial complexes. Taking into account the inter-dependency of two stages, we show a process how to decompose the environmental efficiency into production efficiency and abatement efficiency. Moreover, our new proposed method can be used to explain the information on network relationship between economic growth and environmental protection.
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