• Journal of Digital Convergence
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• v.17 no.9
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• pp.39-46
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• 2019

This study started with the question of whether the percentage of non-aeronautical revenues at Incheon airport was extremely high when compared with other international airports. Although aeronautical revenues for the airport based on the traditional business model have the limits to grow due to various regulations, stakeholders concerned about improving the competitiveness recently have been interested in increasing non-aeronautical revenues. This study deals with the effect of non-aeronautical revenues at international airports on airport charges as the extent of airport privatization get stronger. To examine hypotheses, we collected international data from trustful sources. Finally, we conducted an empirical analysis of 178 airports worldwide. As a result, the higher the percentage of non-aeronautical revenues at international airports, the lower the airport charges were. Besides, the private equity ratio positively moderated the relationship between the percentage of non-aeronautical revenues and airport charges. Privatization of airports may offset the effects of reduced airport charges through increased commercial activity. Graphical display for moderation effect is offered to facilitate comprehension.

• Journal of the Korean Society for information Management
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• v.36 no.1
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• pp.295-313
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• 2019

The purpose of this study is to analyze library space use patterns through users' smartphone WiFi. This study is applied a method to detect WiFi signal of users' smartphone to analyze the in-library wayfinding of users. The library usage data were collected for four months in a library in Seoul, Korea. The results show that the average 37.9% of library users revisits the library the next month. Half of users stay under 7 minutes in the library. Users mainly visit the library between 2 and 3 o'clock, and few users visit the library after 5 pm on weekends. The floor moving pattern result shows that the co-visit rate between the third and fourth floor is higher than others, in that these two floors are mainly composed of book shelves. These results indicate that the method to detect the WiFi signal for spatial pattern analysis could be more effective than observation which was used in previous research. It, therefore, is expected that this method would be applied in other libraries to analyze and enhance the library space usage.

• 한국벤처창업학회:학술대회논문집
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• 2019.04a
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• pp.45-49
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• 2019

매년 수많은 기업이 폐업하고 있으며 그 숫자만큼 폐업 기업의 대표가 실패하고 있다. 중소기업연구원의 재기성공요인 분석을 통한 중소 벤처기업의 재도전 활성화 연구(백필규,2011)에 의하면 폐업이나 부도의 형태로 실패하는 기업이 급격하게 증가한 시점은 외환위기가 발생했던 1997년과 1998년의 사이로 보고 있다. 부도 기업의 숫자가 외환위기때는 약 4만사, 1999년부터 2010년까지도 평균 4만 7천여사가 발생하였고 폐업기업수는 부도기업보다 훨씬 많아 매년 80~90만개 전후의 기업이 실패하고 있다. 최근 IBK경제연구소의 실패기업인의 재창업 지원제도 설문조사 결과(김나라,2017)에 의하면 최근 5년간 창업기업은 연평균 77만개사, 폐업기업은 69만개사로 조사되었으며 창업기업의 5년 생존율은 27.3%로 OECD 주요회원국 17개국중 최하위를 차지했다. 오랜시간 대한민국 사회는 사업실패는 곧 패가망신이라는 인식이 깊게 자리잡고 있다. 연대보증이나 재기가 어려운 구조로 인하여 폐업기업의 대표가 실패하면 가족들도 모두 힘들어지고 본인은 경제적, 심리적 어려움에 직면하고 있는 현실이다. 정부와 민간 기관들이 실패기업인들의 재기를 지원하기 위하여 다양한 제도를 운영하고 있지만 아직 시행 초기 단계라 보다 재기를 원하는 기업인들에게 맞춤형으로 도움을 줄 수 있는 실질적이고 효과적인 시스템이 구축되었다 할 수 없다. 창업강국인 미국과 중국의 기업가들은 평균 2.8회의 실패 경험을 가지고 있으나 한국의 기업가는 1.3회의 실패 경험을 보유 한다.(중기청, 2014) 폐업기업 대표의 재무적 손실의 규모와 관계없이 불안과 우울이 낮고 회복탄력성이 높은 기업가가 본인과 가족의 삶의 질과 재창업의지에 긍정적인 효과가 있음으로 나타났다. 연구 대상은 재기중소기업개발원의 재기 기업인과 정부 재창업 지원 프로그램에 지원한 재기 기업인을 대상으로 조사 하였으며 본 연구를 통해 폐업기업 대표에게 필요한 사회적 안전장치와 국가의 창업지원이 고용창출, 매출증가로 이어질 수 있는 선순환 구조의 재기 창업 생태계를 만드는 데 일조하고자 한다.

• 한국벤처창업학회:학술대회논문집
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• 2019.04a
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• pp.51-55
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• 2019

기업신용평가(ICR : Issuer Credit Rating)는 기업의 금융상 채무에 대한 전반적인 적기 상환능력, 즉 채무불이행의 가능성을 평가한 것으로 오로지 금융상 채무에 대한 전반적인 채무상환능력을 평가한다. 최근에는 신용평가 등급이 금융시장과의 효과적인 의사소통수단으로 인식되고 기업 IR 및 홍보차원과 기업 간 물품공급과 납품을 위한 업체 선정시 신용등급이 적극적이고 다양하게 활용되고 있다. 이러한 기업신용평가는 최근 경제환경의 급속한 변화에 대응하여 기관별로 평가시스템을 자주 개선하고 있다. 본 연구에서는 정책금융기관 별로 변화된 평가시스템에 대한 평가지표나 구조, 평가시스템을 비교 분석해 그 차이점과 공통점 그리고 경제환경 변화에 따라 변화된 주요지표를 파악해 보고 미래의 신용평가시스템의 변화와 개선방안에 대해 생각하였다. 기관별 비교에서 평가시스템의 차이점은 신보는 신용평가(부실률 기반)와 미래성장성평가(성장성 기반)를 실시하여 보증심사등급(보증의사결정 등급)을 산출하고, 기술자산평가등급은 신용평가등급을 조정(최대 ${\pm}2$등급)하는 보조적 수단으로 활용하고 있으며, 기보는 기술평가(성장성 및 부실률 기반)와 리스크관리용 리스크평가(신보의 신용평가에 해당)로 평가체계를 이원화하여 운영하고, 평가모형은 신보는 객관성을 확보한 정량평가 위주, 기보는 공신력을 확보한 정성평가 위주의 주관적인 평가를 실시하고 있어 어떤 형태의 평가시스템이 더 좋은 평가방법 인지는 알 수 없지만, 기관별 부실율을 보면 다소 참고가 될 수도 있으나, 이것이 전적인 평가의 문제라 보기도 어렵다. 특히 신보는 창업기업 기준이 창업후 7년까지로 확대됨에 따른 창업 3단계 평가제도와 기업의 성장단계에 맞춘 성장단계별 평가기준 세분화는 기업환경을 잘 반영한 변화라 볼 수 있다. 그리고 향후 평가시스템은 경제환경의 변화속도를 어떻게 잘 반영 할 수 있는지에 대한 연구로 방향이 전개될 것으로 보인다.

• The Journal of the Convergence on Culture Technology
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• v.7 no.1
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• pp.216-222
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• 2021

COVID-19 pandemic brings attentions to the nonmilitary and transnational non-traditonal security threats, as the scales of such damage by these threats are beyond expectation. The Republic of Korea Army tries to forecast non-traditional security threat which may be occurred in Korean peninsula by using collective intelligence platform. In coming years, climate change, social changes and technology development caused by the 4th industrial revolution will diversify non-traditional security threat. Considering urbanization, internet distribution rate, and geopolitical location where atmosphere from continent and ocean meet, Korea would may face the most lethal ones compared to those of other countries may face. Therefore, to predict such threats in pangovernment scale using collective intelligence platforms which embrace civil, public, military, industry, academy and research center is the most important than anything.

• Journal of the Korea Convergence Society
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• v.13 no.3
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• pp.23-31
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• 2022

This study analyzed the actual frozen container operation data of Starcool provided by H Shipping. Through interviews with H's field experts, only Critical and Fatal Alarms among the four failure alarms were defined as failures, and it was confirmed that using all variables due to the nature of frozen containers resulted in cost inefficiency. Therefore, this study proposes a method for detecting failure of frozen containers through characteristic importance and PCA techniques. To improve the performance of the model, we select variables based on feature importance through tree series models such as XGBoost and LGBoost, and use PCA to reduce the dimension of the entire variables for each model. The boosting-based XGBoost and LGBoost techniques showed that the results of the model proposed in this study improved the reproduction rate by 0.36 and 0.39 respectively compared to the results of supervised learning using all 62 variables.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.42 no.4
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• pp.501-508
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• 2022

Required essential technique is to determine the maximum recharge pressure in the well with condition of non-ground failure for the recovery of the groundwater. Based on the classical soil mechanics, the maximum recharge pressure was estimated with the numerical anlaysis and laboratory triaxial test. In the numerical analysis, the maximum recharge pressure is defined as the ground failure stress. The ground failure of the sand was defined as the piping and the one of the caly was to the undrained failure by the confined pressure increment. In the triaxial test, the recharge pressure in the ground was modified by the back pressure in the specimen. In case of sand, the volume strain was dramatically increased at the 93 % of the maximum back pressure, same meaning of the 0 effective stress state. In case of clay, the only radial volume strain was to reached 1.5 % without failure. Therefore, The maximum recharge pressure could be determined with the numerical analysis and triaxial test.

• The Journal of the Acoustical Society of Korea
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• v.40 no.6
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• pp.537-545
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• 2021

Due to the accelerated development and transformation of coastal waters by humans, damage to marine mammals is a concern. To understand how coastal development may affect marine mammals, it is essential to determine their distribution characteristics. In this study, the appearance of finless porpoises was confirmed by passive acoustic monitoring around the Southwest offshore wind farm in July, 2020. Although there were no visual observation results of finless porpoises in the research area, the clicks measured in the offshore wind farm were verified by comparing with acoustic characteristics of the clicks measured in the area with a high detection rate. During the experimental period, clicks of finless porpoises were recorded for ten consecutive days, and Clicks per Porpoise Positive Minute (CPPM) was 40.7 clicks min-1, Porpoise Positive Minutes (PPM) was 9.7 %, Encounter duration and waiting time were 18.2 min and 94.9 min respectively. This study provides information on the appearance of them in the Southwest offshore wind farm and this result may help to monitor the impact of marine mammals from wind farm operation.

• Journal of the Korean Society for Library and Information Science
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• v.56 no.4
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• pp.335-356
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• 2022

Universities contribute to the development of the country and society by cultivating professional manpower with knowledge and qualifications as democratic citizens through education and research activities. To this end, the government is improving the basic capabilities of universities and supporting autonomous innovation through university financial support projects. Since the financial support project differentially supports the government's finances limited to universities with a comparative advantage through fair evaluation, the role and function of the university library, a basic educational facility and core institution that supports education and research, is important. However, university libraries have not been able to actively participate in the government's financial support projects due to financial and manpower shortages, poor environments such as facilities, facilities, and spaces, and low participation rates for students. Therefore, this study investigated and analyzed the program operation cases of 18 university libraries in which libraries participated among 45 universities selected for the ACE project (2010-2016), derived problems and implications, and questioned the roles and achievements of university libraries. Based on the results, strategies and measures to be considered by university libraries in preparation for the government's university financial support projects were proposed.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.21 no.5
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• pp.67-77
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• 2022

An automatic freeway bus-only lane enforcement system was developed and assessed in a real-world environment. Observation of a bus-only lane on the Youngdong freeway, South Korea, revealed that approximately 99% of the vehicles violated the high-occupancy vehicle (HOV) lane regulation. However, the current enforcement by the police not only exhibits a low enforcement rate, but also induces unnecessary safety and delay concerns. Since vehicles with six passengers or higher are permitted to enter freeway bus-only lanes, identifying the number of passengers in a vehicle is a core technology required for a freeway bus-only lane enforcement system. To that end, infrared cameras and the You Only Look Once (YOLOv5) deep learning algorithm were utilized. For assessment of the performance of the developed system, two environments, including a controlled test-bed and a real-world freeway, were used. As a result, the performances under the test-bed and the real-world environments exhibited 7% and 8% errors, respectively, indicating satisfactory outcomes. The developed system would contribute to an efficient freeway bus-only lane operations as well as eliminate safety and delay concerns caused by the current manual enforcement procedures.