[국내논문]유해산출물을 고려한 국내 컨테이너 터미널 효율성 분석 Data Envelopment Analysis for Container Terminals Considering an Undesirable Output - Focus on Busan Port & Kwangyang Port원문보기
Recently according to increase of enlarged scale ports in conformity with increase in over size vessels and container handling service, pollutants generated from ports are increasing. In advanced countries, reduction in carbon dioxide emission assigned to them has been implemented according to the C...
Recently according to increase of enlarged scale ports in conformity with increase in over size vessels and container handling service, pollutants generated from ports are increasing. In advanced countries, reduction in carbon dioxide emission assigned to them has been implemented according to the Climate Change Convention and Kyoto Protocol from 2008 to 2012 in order to lessen carbon dioxide emission. Henceforth increase in discussion on the measure of constructing Green Port and low-carbon port is expected in our nation's field of port as well, it is considered that the effort in reduction with regard to undesirable output which causes environmental problem of analysis target during measuring effectiveness. Therefore, in this study, effectiveness was estimated through directional technology distance function considering undesirable output differently from effectiveness analysis of existing container terminal, and then performed comparative analysis with the result analyzed with BCC output-oriented model. As the result of analysis, in 2007 DMU3 and DMU5, and in 2010 DMU2 and DMU4 appeared to be efficient terminals in BCC output oriented model, and in directional technology distance function model, DMU1, DMU3 in 2007, DMU3, DMU5 in 2008, DMU7 in 2009, and DMU2, DMU5 in 2010 appeared to be efficient terminals.
Recently according to increase of enlarged scale ports in conformity with increase in over size vessels and container handling service, pollutants generated from ports are increasing. In advanced countries, reduction in carbon dioxide emission assigned to them has been implemented according to the Climate Change Convention and Kyoto Protocol from 2008 to 2012 in order to lessen carbon dioxide emission. Henceforth increase in discussion on the measure of constructing Green Port and low-carbon port is expected in our nation's field of port as well, it is considered that the effort in reduction with regard to undesirable output which causes environmental problem of analysis target during measuring effectiveness. Therefore, in this study, effectiveness was estimated through directional technology distance function considering undesirable output differently from effectiveness analysis of existing container terminal, and then performed comparative analysis with the result analyzed with BCC output-oriented model. As the result of analysis, in 2007 DMU3 and DMU5, and in 2010 DMU2 and DMU4 appeared to be efficient terminals in BCC output oriented model, and in directional technology distance function model, DMU1, DMU3 in 2007, DMU3, DMU5 in 2008, DMU7 in 2009, and DMU2, DMU5 in 2010 appeared to be efficient terminals.
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가설 설정
In this study, we investigated how carbon dioxide (Hereafter CO2) associated with energy that can be generated from port affects on the efficiency of port.
제안 방법
There are some restrictions in analyzing with CCR model and BCC model of DEA when undesirable output is considered. Hereby DEA analysis was performed using Directional Technology Distance Function keeping undesirable output in mind in this study.
According to study purpose, directional vectors can be set in a variety ways. Directional vector was set as a current input factors and output factors of each DMU in this study. That is, we used Luenberger productivity index which considers directional input distance as well as output distance function at the same time.
On the basis of existing studies, analysis was carried out by selecting multiple numbers of input variables and output variables. According to the review results of variables related with port efficiency in previous theoretical studies, container throughputs was set as an output variable in most of studies.
Therefore, quay length, number of C/C, and CY area were chosen as input variables, container processing volume was set as a beneficial output, and CO2 emission was set as an undesirable output for efficiency estimation.
For the efficiency analysis for container terminal in this study, by using DEA directional production distance function considering undesirable output unlike other port efficiency research, production efficiency was analyzed.
이론/모형
are highly costly ones, effort should be made to produce maximum output by operating given input variables. Therefore, by assuming that there is a sizable economy is existed in port industry, efficiency was analyzed by using BCC output-oriented model.
Generally, Directional Distance Function is separated by Directional Input Distance Function and Directional Output Distance Function, Directional Technology Distance Function. The reciprocal of the distance function is known as the Farrell output measure of technical efficiency (Farrell, 1957). In order to allow for the possibility of crediting firms for the reduction of bad outputs, we use a directional output distance function instead of the Shephard output distance function to represent technology.
성능/효과
Descriptive Statistics for the input and output variables shows that average quay length was around 1,171.6m, average number of container crane was around 9.5, average yard area was around 361,000.0㎡, and average container handling volume was around 1,239,783.3TEU, and average CO2 emission was around 5,972.9tonCO2.
Correlation analysis between input and output showed that 90.5% correlation was found between number of crane and processing result, 85.7% between number of crane and CO2 emission, high correlation of 94.7% was found between processing result and CO2 emission. This expresses that with increases in container processing volume, many numbers of cargo handling equipments(C/C) are required, which leads power consumption increased with number of cargo handling equipments involved in operation, which in turn increases CO2 emission.
High average efficiency score was found from the result using model with undesirable variables than model that did not consider the undesirable output, and 7(21.8%) terminals in model with undesirable output and 4(12.5%) terminals with models without undesirable output were found efficient.
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