선박금융의 금리결정 요인에 관한 연구

정경석,이 기 환,김명희 한국항만경제학회 2024 韓國港灣經濟學會誌 Vol.40 No.1

선행연구에 따르면 선박금융 가산금리 결정의 핵심요소는 리스크 프리미엄이라는 것을 알 수 있다. 이에 본 연구에서는 다중회귀모형을 적용하여 선박금융 리스크 프리미엄 결정 요인에 대한 분석을 수행하였다. 리스크 프리미엄을 종속변수로 두고, 대출특성, 차주의 신용도, 거시경제 상황 등 3개 요인 총10개의 독립변수를 선정하였다. 2014부터 2022년까지 A은행이 지원한 82개 선박금융 사례를 분석 표본으로 하였다. 전체 표본을 대상으로 한 실증분석 결과, 유동비율, 부채비율, 업력, 운임지수 등 실선주신용도와 경제상황 요인이 선박금융 리스크 프리미엄에 영향을 미치는 것으로 나타났다. 컨테이너선의경우, 리스크 프리미엄에 영향을 미치는 변수로 유동비율, 현금보유비율, 부채비율, 영업이익률 등 실선주 신용도 요인이 유의미한 것으로 나타났다. 벌크선은 실선주 신용도 요인인 부채비율과 업력이 리스크 프리미엄에 어느 정도 영향을 미치는 것으로 나타났다. 가스선의 경우, 시장상황 요인이 리스크 프리미엄에 영향을 미치는 것으로 분석되었다. 하지만, 탱커선을 대상으로 한 모형에서는 모든 요인이 선박금융 리스크 프리미엄에 영향을 미치지 못하는 것으로 나타나고 있다. 전체적으로 리스크 프리미엄을결정하는 요소 중 차주인 해운기업의 재무지표가 가장 유의미하게 작용하고 있는 것을 알 수 있다. According to previous studies, the key factor in determining the loan interest rate for shipping companies is the default risk premium. Therefore, this study analyzes the determinants of the risk premium of shipping loans using a multiple linear regression model. With the risk premium as the dependent variable, a total of 10 independent variables are selected, including three factors: loan characteristics, borrower's creditworthiness, and economic situation. Samples are 82 shipping loans supported by Bank A from 2014 to 2022. As a result, borrower's creditworthiness(current ratio, debt ratio, firm age) and economic situation(freight index) affect the risk premium in analysis for all samples. It is found that borrower's creditworthiness has some influence on the risk premium for container ships(current ratio, cash holding ratio, debt ratio, operating income to sales) and bulk carriers(debt ratio, firm age). Market situation affects the risk premium in gas carriers. However, in the model targeting tanker ships, unlike previous studies, all factors have no effect on the risk premium.

Fabrication of poly (ether sulfone) nano ion-exchange fibers by electrospinning and its adsorption properties

정경석,정민호,황택성 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1

Poly (ether sulfone) nano ion-exchange fibers were prepared by electro spinning and their adsorption properties were investigated. The beads were formed at the low concentration of PES, while the thickness of fiber increased at the high concentration of PES. Fiber’s thickness dependent on tip to collector distance (TCD), voltage and flow rate. Functional group was introduced to PES fibers by sulfonation. Through the FT-IR analysis, we confirmed that -SO3H group was introduced to the fibers. Degree of sulfonation was proportionate to the concentration of chlorosulfonic acid. The degree of sulfonation caused the change of water uptake, ion exchange capacity and its properties were increased slightly.

Synthesis of block copolymer cation exchange membrane with using Dimethyl 5-sulfoisophthalate Sodium salt-1,6-hexanediol- (isophthalic acid-maleic anhydride) ionomer and its properties

정경석,강기원,황택성 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1

In this study, cation exchange membranes were prepared using melt polycondensation. The block copolymer was synthesized by two step polymerization using 5-sulfoisophthalate sodium salt (DMSIP), 1,6-hexandiol (HDO), isophthalic acid (IPA), and maleic anhydride (MA). After synthesizing the block copolymer, ion exchange membranes were prepared by UV curing using pentaerythritol triacrylate (PETA) as a crosslinking agent. The chemical structure of the block copolymer was investigated by 1H-NMR, 13C-NMR, and FT-IR. Thermal properties of the synthesized ionomer were investigated using TGA and DSC. And the basic properties of membranes were measured such as water uptake, ion exchange capacity, ion conductivity, electrical resistance.

Synthesis of anion exchange membrane by modified PVDF and its properties

정경석,오창민,황택성 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1

The novel anion exchange membranes were synthesized by modified polyvinylidenefluoride (PVDF) and aminated 4-toluidine. Before aminating, 4-toluidine was brominated by N-bromosuccinimide (NBS). Anion exchange membranes were cross-linked using divinylbenzene to improve the mechanical strength. The chemical structure of PVDF anion exchange membranes were investigated by Fourier-transform infrared (FTIR) spectrometry and nuclear magnetic resonance (12C NMR). The membrane's properties such as swelling ratio (S.R), water uptake (W.U), ion exchange capacity (IEC), total dissolved solids (TDS) and electric resistance (E.R) were measured by back titration and LCR meter etc.

住宅設計에서 環境 心理的 要因의 適用 方案에 關한 硏究

丁慶錫 順天靑巖大學 2001 論文集-順天靑巖大學 Vol.25 No.-

The concept of privacy, personal space, territoriality, and crowding are central to the study of environmental and behavior relationship. This study is focused on applying These major concepts to the residential design. The scale and form in the space design must be decided by satisfying on the purpose of the space. In this aspect, it is very significant of applying the major of environmental psychology to the residental design. The key point of environmental psychology is 'Man is different to each other'(Corwin Benett). And so it is an elementary principle to transform the environment by fitting Man on the environment than the environment on Man in the environment design.

외상후 사망한 환자의 임상적 분석

정경석,송대기,이계균,문성하 대한외상학회 1995 大韓外傷學會誌 Vol.8 No.1

Trauma is a leading cause of death in Korea, but trauma care system are not well developed. To characterize cause of death and unexpected death following trauma, 295 traumatic deaths from January, 1987 to December, 1994 at Kangnam Sacred Heart Hospital were retrospectively reviewed for mechanism of injury, trauma indices, cause of death, and preventability. Of the 295 traumatic deaths, 119 patients(40%) died in the emergency room (ER) and 176 patients(60%) died in operating room or intensive care unit (ICU). Male-to-female ratio was 2.2:1 and the mean age was 36 + 20 years (range, 1-86 years). The mean time between the injury and initial treatment in ER was 227 + 888 minutes (441 + 1295 minutes for prehospital care group vs. 86+393 minutes for non- prehospital care group), but there was no significant difference hetween prehospital care group and non-prehospital care group in trauma indices. There were 209(70.8%) motor vehicle crashes, 51(17.4%) fall downs, 16(5.4%) violences, 16(5.4%) stab wounds, and 3(1. 0%) other injuries. Brain injury was judged to be the main cause of death in 51. 5% of patients. The causes of 20 unexpected deaths in ICU inspite of Ps>0.5 via TRISS methodology were hypovolemic shock(40.0%) and brain injury(25.0%). The APACHE II system significantly overestimated the risk of cleath in the lower ranges of predicted risk and underestimated the deaths in the higher ranges. Although TRISS methodology was not developed for ICU trauma patients, it tended to perform better than APACHE II system in our sample.

사용자 적합성 피드백과 구루 평가 점수를 고려한 블로그 검색 방법

정경석,박혁로,Jeong, Kyung-Seok,Park, Hyuk-Ro 한국정보처리학회 2008 정보처리학회논문지B Vol.15 No.5

대부분의 웹 검색엔진은 문서의 적합도와 중요도를 함께 고려하는 순위화 방법을 사용한다. 문서의 적합도는 문서가 사용자의 검색의도를 만족시키는 정도이고, 중요도는 인기 있거나 양질의 내용을 포함하는 등 문서의 품질을 표시하는 정도라고 할 수 있다. 지금까지 웹 문서의 중요도를 평가하는 방법으로 가장 성공적인 것은 하이퍼링크 구조를 사용한 방법이다. 하지만 블로그의 경우, 해당 블로그를 작성한 블로거와 그 블로거가 소유하는 다른 문서들을 알 수 있기 때문에 문서의 중요도를 평가하는 다른 방법을 생각할 수 있다. 본 논문에서 제안하는 방법은 사용자의 북마크와 클릭를 이용하여 문서의 중요도를 계산하고, 그러한 문서 점수를 바탕으로 블로거의 구루점수를 계산한다. 마지막으로 문서를 순위화할 때 해당 문서를 작성한 구루의 구루 점수를 반영한다. 이렇게 되면 구루점수가 높은 구루 블로거의 문서들이 상위에 검색됨에 따라서 전반적으로 검색 품질이 개선될 수 있다. 블로그 문서를 대상으로 한 실험결과 제안하는 방법이 기존의 전통적인 웹 검색 성능과 비교하여 정답집합과의 연관성이 높음을 알 수 있었다. Most Web search engines use ranking methods that take both the relevancy and the importance of documents into consideration. The importance of a document denotes the degree of usefulness of the document to general users. One of the most successful methods for estimating the importance of a document has been Page-Rank algorithm which uses the hyperlink structure of the Web for the estimation. In this paper, we propose a new importance estimation algorithm for the blog environment. The proposed method, first, calculates the importance of each document using user's bookmark and click count. Then, the Guru point of a blogger is computed as the sum of all importance points of documents which he/she wrote. Finally, the guru points are reflected in document ranking again. Our experiments show that the proposed method has higher correlation coefficient than the traditional methods with respect to correct answers.

시공간 핫스팟지역의 탐색방법론에 관한 연구

정경석 한국정책분석평가학회 2010 한국정책분석평가학회 학술대회발표논문집 Vol.2010 No.4

The hollow TiO2 nanofibers for dye sensitized solar cells by electro spinning

정경석,황치원,이광복,황택성 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.0

Preparation of high porous TiO2 nanofibers for dye sensitized solar cells by electrospinning

정경석,황치원,이광복,황택성 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.0