• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.5
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• pp.2093-2105
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• 2013

Successful implementations of domestic public construction projects have been increasingly concerned with the efforts to improve the inefficient execution. However, the existing factors causing the inefficient execution have been repeatedly occurred in many projects. This is because the previous studies have been concentrated on identifying the factors without in-depth analysis and systematic prioritization. This study has clarified the characteristics of the inefficient public construction projects, identified the causes, constructed their hierarchical structure, and analyzed the impacts on them. In particular, the critical factors causing the inefficient execution are prioritized by the outcomes derived from the questionnaire surveys, which is limited to the pre-construction stage. They are utilized in prioritizing the institutional and political improvements. However, in the future, the analytic and detailed guideline for remedying the factors causing the inefficient execution of a project should be studied, and their analysis will be extended to the construction stage.

• Journal of Korean Society of Transportation
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• v.31 no.2
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• pp.11-19
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• 2013

This study analyzed relative efficiencies of fourteen airports in Korea with radial and non-radial approaches such as DEA(Data Envelopment Analysis) and SBM(Slack Based Measure) from 2004 to 2011. To suggest an improvement scheme for these airports, we analyzed slack airports and compared then with respective reference airports. To measure efficiency, we used the length of runway, the number of employees, and the size of terminal as input factors, and the number of passengers, the amount of cargo, and the number of flights as output factors. The analysis results showed that efficiencies of most airports had been decreasing and that the gap between efficient airports and inefficient airports was widening. Additionally, most airports had much slacks in its terminal size. It meant that they had been operated with a size not proportionate to their demands and that it is a major cause of inefficiency.

• The Journal of the Korea Contents Association
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• v.20 no.12
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• pp.136-144
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• 2020

Previous studies report that labor investment inefficiency occurs as the information asymmetry becomes severe and the agency problem between managers and external investors increases. Therefore, it is highly likely that managers will make opportunistic decisions that can damage corporate value in companies with high labor investment inefficiency. This study examines whether the value relevance of accounting information decreases as labor investment inefficiency increases as it is less likely that investors in the market use the accounting information of companies in which labor investment decisions are made inefficiently. Labor investment efficiency is measured as the difference between the actual level of labor investment and the expected level of optimal labor investment. Larger difference between the actual level of labor investment and the expected level of optimal labor investment is considered as higher inefficiency in labor investment. Using data of firms listed on the Korea Stock Exchange from 2002 to 2018, empirical results show that the value relevance of earnings decreases as the inefficiency of labor investment increases. This research provides empirical evidence on whether investment inefficiency in labor, which is an important factor in the competitiveness of a company, reduces the information usefulness of reported earnings.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.22 no.4
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• pp.301-315
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• 2011

DEA(Data Envelopment Analysis) is useful to measure the relative efficiency of organizational units where the presence of multiple inputs and outputs. This study applied DEA-CCR and DEA-BCC to evaluate the technical, pure technical, and scale efficiency of 29 university libraries. The input variables were number of books, print edition expenses, building space, staff, number of seats. As output variables we estimated: reader visits, number of borrowed items, number of visitors. It was found out that number of libraries with 100% relative efficiency among 29 libraries were 13. Also the results shows that main reason of inefficiency was from scale rather than from pure technical. Many inefficient libraries were operations of increasing return to scale.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.502-502
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• 2013

유기태양전지는 간단한 제작 공정과 저비용 제작이 가능하고 플렉서블 소자를 제작할 수 있는 장점을 가지고 있어서 많은 연구자들이 관심을 가지고 있다. 하지만 현재 유기태양전지의 효율은 낮기 때문에 실리콘 기반이나 화합물 기반의 태양전지에 비해서 효율이 낮은 단점을 가지고 있다. 유기태양전지의 효율을 높이기 위한 다양한 연구들이 활발하게 진행되고 있다. 특히 나노구조를 가지는 광활성층을 사용하여 제작된 고효율 유기태양전지에 대한 연구가 이루어지고 있다. 나노구조를 가지는 유기태양전지는 생성된 엑시톤을 분리시킬 수 있는 계면이 넓어지기 때문에 전하 분리 효율을 높아지게 되고, 고효율의 유기태양전지를 제작할 수 있게 된다. 또한, 넓은 광흡수 스펙트럼을 가지는 양자점을 활용하는 연구도 함께 진행되고 있다. 양자점을 사용하여 유기태양전지의 효율을 높이는 실험이 진행되고 있지만, 실제 효율을 높이는데 많은 어려움을 가지고 있다. 본 연구에서는 고분자점과 양자점이 결합한 나노복합체를 사용하여 요철 구조를 가진 광활성층을 사용한 유기태양전지를 제작하였다. 고분자점과 양자점이 결합한 나노복합체는 물질에 비해서 넓은 광흡수 영역을 가져서 생성된 엑시톤의 양을 늘리는 역할을 한다. 고분자점과 양자점이 결합한 나노복합체로 만든 요철 구조는 평면구조로 제작한 요철 구조에 비해서 계면에서 균일한 적층이 가능한 나노구조가 제작되기 때문에, 계면에서 일어나는 전하 손실을 줄일 수 있다. 고분자점과 양자점이 결합한 나노복합체로 제작된 요철 구조를 사용한 유기태양전지가 기본 소자에 비해서 상당한 효율 향상을 확인하였다. 양자점을 포함한 나노복합체로 제작된 유기 태양전지의 효율증진 메커니즘을 논한다.

• Land and Housing Review
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• v.11 no.1
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• pp.49-57
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• 2020

본 연구는 기업의 투자효율성이 투자부동산 비중에 미치는 영향을 살펴보았다. 경영자의 사적이익 추구현상과 대리인비용이 클수록 나타나는 과잉투자성향이 기업의 투자부동산 비중을 증가시키는지 분석하였다. 이를 위해 2007년부터 2018년까지 유가증권시장과 코스닥시장의 5,781개의 기업-연도를 대상으로 분석하였으며 투자효율성은 McNichols and Stubben(2008)의 연구방법론으로 측정하였다. 분석결과는 다음과 같다. 첫째, 투자 비효율성이 커질수록 기업의 투자부동산 비중이 증가하는 것으로 나타났다. 이는 투자 비효율성이 높을수록 나타나는 대리인비용과 경영자의 제국건설성향이 투자부동산 비중과 유의한 관련성을 갖는다는 것을 의미한다. 둘째, 유가증권시장과 코스닥시장으로 구분하여 분석한 결과에서는 코스닥시장에서 유의성을 확인할 수 없었다. 즉, 투자 비효율성이 커질수록 나타나는 투자부동산의 비중은 유가증권시장에서 관찰되었다. 셋째, 투자 비효율성을 과잉투자와 과소투자로 구분하여 분석한 결과에서는 과잉투자성향이 증가할수록 투자부동산의 비중이 증가하였으나 과소투자와는 관련성이 나타나지 않았다. 이상의 연구결과는 그 간의 선행연구에서 주로 투자부동산과 기업 가치의 관련성에 초점을 맞추었던 반면, 대리인비용과 투자부동산 비중 간의 실증적 증거가 부족한 가운데 추가적인 학문적, 실무적 시사점을 갖는다.

• Journal of Navigation and Port Research
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• v.29 no.10 s.106
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• pp.921-926
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• 2005

The purpose of this paper is to conduct a comparative analysis of container terminal operation in Busan and Kwangyang port. The research method used for this study is DEA(Data Envelopment Analysis} and among DEA methods CCR and BCC model has been used. According to the results of CCR model Gamman in 2004 and Gamcheon in 2004 are found to be the most efficient terminals in the sample and the inefficient terminals include Gwangyang Phase 2 terminal. Based on BCC model Gamcheon and Uam are identified as the most efficient terminals in three consecutive years including Gamman terminal in 2004. The inefficient terminals include New Gamman in 2002 and Hutchison in 2002. The research findings show that inefficient terminals need to fully utilise their terminal facilities and increase container throughput through effective marketing activities.

• KDI Journal of Economic Policy
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• v.33 no.3
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• pp.33-55
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• 2011

Market concentration in the Korean banking industry has markedly increased since the financial crisis of 1997-1998 because of M&As, P&As, and consolidation of banks. With this change, there has been a growing concern over market power in the Korean banking sector. We examine the effects of market concentration on bank efficiency and competition for the period of 1992-2006. Three different indicators of bank inefficiency are used in this study, including X-inefficiency that is derived from the directional technology distance function. The level of competition is measured by both the H-statistic of the Panzar-Rosse model and the level of the net interest margin and its standard deviation. Empirical results indicate that market concentration has not improved bank efficiency through scale economies or scope economies. Instead, recent mergers, acquisitions and consolidation of banks resulted in an increase in inefficiency measured by the three different indicators: X-inefficiency, labor inefficiency and asset inefficiency. While an increase in market share of individual banks improved bank efficiency, an increase in the overall market concentration ratio resulted in lower efficiency. Our study also finds that the Korean banking sector has been monopolistically competitive throughout the sample period except for the crisis period according to the H-statistic. Although an increase in market concentration ratio has not changed the overall level of bank competition, it has a positive significant effect on the level of the average interest margin.

• The Journal of the Korea Contents Association
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• v.22 no.2
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• pp.593-604
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• 2022

This study examines how auditors respond to labor investment inefficiency, specifically its impact on audit fees and audit hours. Using a sample of Korean firms listed on the Korea Stock Exchange from 2003 to 2018, our empirical results indicate that firms involved in inefficient investment in labor incur higher audit fees and audit hours. This implies that auditors consider inefficient labor investment to cause considerable business risk, thus requesting higher external audit fees to compensate for higher audit risk. Furthermore, auditors expend more time and effort while auditing those firms by expanding the audit procedures to reduce the audit risk to an acceptable level. Finally, this study provides empirical evidence on whether the investment inefficiency in labor, an important factor in firms' competitiveness, incur higher audit fees as well as audit hours.

• Journal of Information Management
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• v.41 no.2
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• pp.111-131
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• 2010

This paper examines the levels and influence factors on efficiency of public libraries in metropolitan cities. For this purpose, In the first stage, the efficiency score analysis of 129 sample public libraries has been undertaken. In the second stage, the efficiency scores obtained from the first stage are regressed on environmental factors. The result of this study shows that : (1) main source of technical inefficiency is pure technical inefficiency rather than scale inefficiency; (2) it is positive effect environmental factors on the efficiency that the population, the dummy variable of capital area.