• Journal of Korean Society for Geospatial Information Science
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• v.15 no.2 s.40
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• pp.87-93
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• 2007

Over the years, Advanced Public Transportation System (APTS) has been implemented to manage and operate public transportation system. With the expanding mass spatio-temporal data such as comprehensive spatial information of each individual passenger and public transportation vehicle, it has been required to consolidate and analyze these multiple data sets from various sources. This paper demonstrates how GIS is utilized for the consolidation of massive transit related spatio-temporal information. And it presents effective applications to improve transit planning process and support transit related decision-making activities. GIS based system is used to combine multi-agents' data in the areas of transit operation and individual transit ride and transfer management. Due to the unique comprehensiveness and the level of detail of the data provide by the Seoul Transit system, this GIS based information consolidation is the first in its class. Based on the integrated database, this paper describes the effective and efficient GIS based analysis deployed in a transportation system planning process. The data integration systems and analytic models developed in this paper can be transferred and applied by any municipal governments provided that the appropriate data is available.

• The Korean Journal of Financial Studies
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• v.11 no.1
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• pp.217-242
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• 2005

본 연구에서는 부도기업의 부도 후 회생여부와 부도발생시의 주식시장의 반응과의 관계를 조사하였다. 즉 증권시장이 부도기업의 사후적인 회생 또는 회생실패에 대한 통찰력을 부도시에 이미 갖고 있는지를 부도처리시의 주가반응을 분석함으로써 검정하고자 하는 것이다. 이를 위하여 외환위기 후 상장기업의 부도가 빈발하였던 1998년에서 2000년 사이에 부도가 발생한 상장회사 55개 기업을 대상으로 후에 회생한 기업(31개기업)과 그렇지 못한 기업(24개 기업)을 구분하여 후에 회생한 기업의 부도시의 주가반응이 회생하지 못한 기업의 부도시의 주가반응보다 덜 부정적이었는지를 검정하였다. 실증분석 결과 부도기업 중 후에 회생한 기업(31개기업)의 분석기간 ($-10{\sim}+10$)중 평균초과수익률과 누적평균초과수익률이 비회생기업(24개기업)의 그것에 대하여 유의한 (+)의 차이가 나타나지 않았다. 또한 부도기업의 누적초과수익률을 종속변수로 하고 회생여부를 나타내는 더미변수, 전년도감사의견이 적정의견인지의 여부, 부채비율, 총자산(억원) 자연 로그값, 사전적 폭로정보 대용변수로서의 지난 1년간 주가반응을 의미하는 (-230, -11)윈도우 누적초과수익률을 독립변수로 하여 다중회귀분석을 실시하였으나 부도후 회생여부를 나타내는 더미변수의 회귀계수는 유의적이지 않았다. 따라서 초과수익률 차이분석결과 회생기업의 부도시의 주가반응이 비회생기업의 그것에 비하여 유의한 (+)의 차이가 없고, 또한 회귀분석 결과 부도시의 초과수익률과 부도후 회생여부는 유의한 관계가 없으므로 부도처리시의 주가반응에서 후에 회생하는 기업이 그렇지 않은 기업보다 덜 부정적일 것이다라는 연구가설은 기각된다.등에 대한 평가기준의 재정립이 강구되어야 할 것이다.한 변동성에서 큰 위험프리미엄이라는 연결고리를 거쳐 코리아 디스카운트라는 현상으로 귀착되는 현상에 주목하고 있는 본 연구의 결과가 실무에서 유용하게 사용됨은 물론이요 또한 본 연구의 방법론 자체가 매우 정교하고 포괄적이어서 금융시계열을 포함한 다른 여러 분야에 크게 응용될 수 있는 외부효과도 기대된다.R 효과는 전통적 의미의 일반적으로 낮은 PER종목이 초과수익률을 내는 것이 아니라, 기업규모가 크더라도 그 기업의 개별특성을 고려했을 때 이와 비교해 상대적으로 PER가 낮은 종목에 투자하면 초과수익을 낼 수 있음을 의미한다. 발견하였다.적 일정하게 하는 소비행동을 목표로 삼고 소비와 투자에 대한 의사결정을 내리고 있음이 실증분석을 통하여 밝혀졌다. 투자자들은 무위험 자산과 위험성 자산을 동시에 고려하여 포트폴리오를 구성하는 투자활동을 행동에 옮기고 있다.서, Loser포트폴리오를 매수보유하는 반전거래전략이 Winner포트폴리오를 매수보유하는 계속거래전략보다 적합한 전략임을 알 수 있었다. 다섯째, Loser포트폴리오와 Winner포트폴리오를 각각 투자대상종목으로써 매수보유한 반전거래전략과 계속거래 전략에 대한 유용성을 비교검증한 Loser포트폴리오와 Winner포트폴리오 각각의 1개월 평균초과수익률에 의하면, 반전거래전략의 Loser포트폴리오가 계속거래전략의 Winner포트폴리오보다 약 5배정도의 높은 1개월 평균초과수익률을 실현하였고, 반전거래전략의 유용성을 충분히 발휘하기 위하여 장단기의 투자기간을 설정할 경우에 6개월에서 36개월로 이동함에 따라 6개월부터 24개월까지는 초과수익률이 상승하지만, 이후로는 감소하므로, 반전거래전략을

• The Journal of the Korea Contents Association
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• v.15 no.3
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• pp.488-498
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• 2015

Form the observation that the successful management and operation of university websites brings about university branding effects, this paper attempts to identify the problems in relation to evaluation elements of university homepages and establish a new evaluation model that allows us to grasp the importance and priority of phased evaluation elements. In particular, we tried to secure the objectivity of the importance of department homepage evaluation elements by using AHP(Analytic Hierarchy Process). Our analysis shows that among 29 evaluation elements of department homepage, mobile service, curriculum, description of department's characteristics, guide to homepage usage/accessibility to site map and differentiated educational method were considered to be relatively important whereas the relative importance of department's slogan, differentiated image and identity, linkage to SNS, Q&A bulletin board, operation of department community, and FAQ was low. Based on the findings from our analysis, we present the basic foundation for successful management and operation of university department homepages along with a few suggestions for vitalizing those hompages.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2008.11a
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• pp.256-261
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• 2008

The curtain-wall work has been more frequently applied in the construction industry since demand of high-rise buildings has been increased. The curtain-wall work is usually performed with the frame work simultaneously for reducing construction period, but it might be delayed because of several problems caused by interference of process. However, there is not an appropriate tool which can be used by a work manager for adjusting quantity of the construction equipments or the workers when the curtain-wall work was delayed. To resolve this problem a construction simulation anticipating and analyzing potential problems before starting the work can be applied in the curtain wall work. This research suggests a general model for the curtain-wall work by using construction simulation and produces a combination of construction equipments and workers which can estimate optimum work productivity.

• Journal of Digital Convergence
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• v.15 no.7
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• pp.97-109
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• 2017

Domestic vehicle penetration rate is growing at 3% per year, but consumers are increasingly buying used cars due to steady price hikes Nevertheless, the used car export market is expected to decline due to import regulations of major countries and the low grade environment of Used car export complex. Therefore, this study using Fuzzy-AHP was aimed to find operational factors of Used car logistics complex and establish a practical management plan of Used car logistic complex in incheon port. Fuzzy-AHP is the method that can be calculated weight of multi-level criteria and change linguistic ambiguity of human to Fuzzy Number. So it's able to propose the realistic decision making alternatives. As a result of the literacture reviews, present study focused on the analysis of the present situation of the logistics of the used car and the activation of the complex, suggested the activation plan and activation of the logistics complex. In the analysis of operational factors, logistic complex cost factors were found to be the most important factors by recording the weighted value of 0.306 in the above factors. The detailed factors were as follows: rent, accessibility, and logistics site size. It is necessary to compute competitive rent for the highly-advanced used car logistics complex, and to realize the rental support policy and to consider designating the free trade zone. In addition, it is necessary to expand the access infrastructure and secure the scale of the company for overseas buyers, and it is necessary to improve the overall government laws and introduce IT system for the future.

• Management & Information Systems Review
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• v.35 no.4
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• pp.123-140
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• 2016

This study investigates whether tax subsidy is associated with the information effect of future earnings (Future Earnings Response Coefficient, hereafter 'FERC'). Prior studies related with tax subsidy suggest that high- tax subsidy is associated with high-Conservatism. And high-tax subsidy is associated with low-information asymmetry. The hypothesis is tested by using sample firms listed on the Korean Stock Exchange from the year of 2002 to the year of 2009 inclusively. We followed methodology of Tucker and Zarowin (2006). We find that the regression coefficient for tax $subsidy{\times}X_{t3}$ shows a significant positive sign. Also, we performed additional test after controlling for variables related with FERC. The regression coefficient for tax $subsidy{\times}X_{t3}$ is consistent with main results. This result means that the changes in the current stock price of higher-tax subsidy contain more information about their future earnings than the changes in the stock price of lower-abnormal audit hours. The evidence suggests that investors positively understand high-tax subsidy.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.4
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• pp.304-310
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• 2017

This study is a methodological research study that tests the validity and reliability of the NCRC (Nurse Clinical Reasoning Competence scale), an instrument developed by Liou and his colleagues as the basic data for enhancing the clinical reasoning competence of nurses, by translating it into Korean and checking the similarity of the sentence structure and meaning (between the two versions?). This study verified its validity and reliability by examining 166 nurses working in four tertiary hospitals located in Seoul and Busan. An analysis of the content validity by experts showed that all of the items have a content validity higher than CVI 0.8. From the exploratory and confirmatory factor analysis, it was found that the instrument includes a total of 15 items consisting of one factor. In addition, the correlation with the Korean version of the Nurse Clinical Reasoning Competence scale is confirmed to test the concurrent validity, by using a measurement tool of nurses' critical thinking dispositions and clinical decision-making abilities (correlation coefficient =.55-.64(p<.001) and Cronbach's ${\alpha}=.93$). Thus, the Korean version of the NCRC may be a useful instrument for evaluating the clinical reasoning competence of Korean nurses and providing the basic data for assessing their clinical reasoning competence and developing their promotion strategies.

• Proceedings of the Korea Water Resources Association Conference
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• 2019.05a
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• pp.349-353
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• 2019

우리나라는 전 국토의 70%가 산지이고 하천경사가 다른 나라에 비해 상대적으로 급하여 홍수 관리에 매우 불리한 조건을 가지고 있으며, 특히 홍수기간의 집중호우 및 돌발홍수는 인명과 재산의 막대한 피해를 입히고 있다. 최근은 기후변화로 인하여 극심한 홍수, 가뭄 등 재해의 발생빈도가 증가하는 추세로 기후변화의 영향을 최소화할 수 있는 수재해 방재관리가 필요한 상황이다. 중 대하천의 경우에는 비교적 수재해 방재관리가 잘 이루어지고 있으나, 소하천(일부 중하천 포함)의 경우에는 취약한 구조를 보이고 있다. 특히 홍수기간(7월~9월)의 인명과 재산의 피해는 주로 소하천 위주로 발생하고 있으며, 사전 사후의 체계적인 대응이 이루어지지 못하고 있다. 수재해 방재관리를 위해서는 일차적으로 수문자료의 획득에 있으며, 그 이후 해당유역에 적합한 수재해 대응을 위한 체계적인 방법론과 방재시스템 개발 운영이 수반되어야 안전한 방재관리를 할 수 있다. 따라서 수재해 방재관리 체계를 구축하기 위해서는 중 소규모 유역 단위를 대상으로 지속적이고 신뢰성 있는 자료의 획득과 축적이 중요하므로 중 소규모 유역 단위의 대표성 있는 시험유역의 운영은 매우 의미가 있다고 볼 수 있다. 본 논문에서는 한국건설기술연구원에서 운영하는 설마천 시험유역(유역면적 $8.48km^2$, 유로경사 2.15%, 경기도 파주시 적성면 소재)의 신뢰성 높은 2018년 관측자료를 이용하여 강우특성, 유출특성, 증발산량과 지하수 함양량 산정 등 수문특성을 분석하였으며, 2017년 관측결과와 비교하였다. 강우특성 분석으로는 호우사상 분리, 주요 호우사상 분석, 지속기간별 최대강우량, 시간분포 등이 있다. 2018년은 2017년보다 최대 강우지속기간은 작게, 평균 강우지속기간은 크게 나타나며, 최대 강우강도와 평균 강우강도도 크게 나타나는 호우의 특징을 보인다. 2018년 지속기간별 최대강우량의 경우 지속기간 1시간까지는 2017년과 유사한 패턴을 보이나 그 이후는 많은 강우량을 보인다. 2018년의 하천유출률은 58.1%로 2017년 연간 유출률인 64.8% 보다는 적은 유출률을 보인다. 이의 원인으로는 연간 총강우량은 2017년보다 397.9mm 많으나 2018년의 7월~8월 집중호우기간의 강우량이 2017년 7월~8월 강우량보다 적어 하천유출에 적게 기여한 결과로 판단된다. 2018년의 증발산량(555.8mm)과 지하수 함양량(32.0mm)은 2017년의 증발산량(328.8mm)과 지하수 함양량(24.8mm)보다 크게 나타나는 것으로 분석되었다. 이와 같이 산정된 수문자료는 수재해 방재와 유역의 물순환 과정 규명을 위한 기초자료로 매우 유용하게 활용될 수 있으며, 수재해 방재관리를 위한 의사결정 과정에 중요한 역할을 할 수 있으므로 지속적인 시험유역의 운영은 매우 필요하다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.38 no.6
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• pp.851-857
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• 2018

In this research, LCA analysis of the manufacturing process of pot bearing for fixed, movable in all directions, movable in one direction was carried out to analyze the environmental load using the LCA methodology. Especially, the water footprint that has been and issue in recent years was analyzed. As a result of LCA, it was analyzed that the contribution of the plate was more than 64.2% in all of the six impact categories in the case of fixed pot bearing base, and more than 94% in the category of resource depletion and photochemical oxidant creation. In the case of all direction pot bearing and one direction pot bearing, the contribution of PTFE was the highest in the global warming and stratospheric ozone depletion, and the contribution by the plate was higher in the other impact categories. The water footprint of each type of pot bearing was analyzed as $22.4m^3\;H_2O\;eq/kg$ for one direction pot bearing, $17.1m^3\;H_2O\;eq/kg$ for fixed pot bearing, and $14.1m^3\;H_2O\;eq/kg$ for all direction pot bearing. As a result of life cycle analysis, the contribution of water use in manufacturing was more than 65% in all three types. The results of this study can be used as basic data for decision making in construction method and material selection of bridges in the future.

• Journal of Korea Port Economic Association
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• v.38 no.3
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• pp.29-51
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• 2022

The International Maritime Organization (IMO) designated the Emission Control Area (ECA) in Northern Europe to reduce the NOx and SOx emissions from ships in the coastal areas. This study used Network slack-based measure (SBM) Data Envelopment Model (DEM) and Bootstrop Truncated Regression (BTR) model to analyze the ECA's impact on ferry companies' financial performances based on the financial data from eight ferry carriers in Northern Europe, the Mediterranean and North America from 2004 to 2017. To alleviate the problem of arbitrary variable selection in DEA, the variable selection criteria proposed by Dyson et al. (2001) were applied; the size of the company was considered through the Network SBM DEA model; and the company's profit-generating process was divided into stages to measure financial performance in more detail. In addition, the BTR model was applied to derive results that minimize the bias of the data. The study found that ECA regulations did not always negatively affect the shipping companies' financial performance. Rather, a steady increase in efficiency was observed for Northern European ferry companies which were subject to the strongest regulations. For North American ferry companies, government subsidies were found to have a significant impact on efficiency, and relatively small impact on efficiency due to the ECA and oil prices. For the Mediterranean ferry companies, efficiency values have decreased since the implementation of ECA regulation despite the lowest level of regulation in the region.