• 한국전문물리치료학회지
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• 제31권1호
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• pp.48-54
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• 2024

Background: Promoting patients' safe return home at discharge and reducing length of stay in hospital is key for Restorative Rehabilitation Institution (RMI). Objects: This study was designed to identify the factors influencing the return to home and length of stay among various factors. Methods: A total of 120 stroke patients (76 males and 44 females) who were hospitalized in an adult inpatient unit of a RMI for more than 2 months were retrospectively analyzed for this study (multivariate logistic regression analyses, p < 0.001). As predictor variables for assessing the return to home and length of stay, demographic data (sex, age, duration between onset and admission, length of stay, caregiver after discharge, occupation after discharge, reason for discharge, and household type after discharge) were collected. Additionally, following measurements were selectively collected from patient's medical records: scores of Mini-Mental State Examination Korean version (K-MMSE), modified Barthel Index Korean version (K-MBI), Berg Balance Scale and Functional Ambulation Category were obtained at admission and discharge. Results: The K-MMSE at admission and K-MBI at discharge were found to be the predictors of return to home. Additionally, K-MBI at admission influenced the length of stay. Conclusion: This study suggests cognitive functioning at admission and the level of activities of daily living at discharge predicted the return to home and length of stay.

• 한국항해항만학회지
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• 제39권5호
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• pp.393-399
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• 2015

Recently, the fierce competitions in the shipping industry and the global economic downturn have heavily influenced ports' operational strategies. In order for port authorities to remain competitive at an international level and to provide more accurate information to develop National policies, ports are required to analyse and improve operations' efficiency. In this paper, the efficiency of 19 Italian ports in 2013, handling different types of cargoes, is assessed through the application of Data Envelopment Analysis (DEA), with constant return to scale (CRS) and variable return to scale (VRS). The purpose of this study is to analyze the efficiency of Italian ports and evaluate whether differences in size and specialization of each port (or cargo handled) are directly correlated with ports' efficiency.

• 한국환경복원기술학회지
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• 제13권3호
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• pp.63-72
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• 2010

This study was conducted to investigate the current status and the improvement plans of the ecosystem conservation fund return projects. In 2007, there was a reformation of the ecosystem conservation fund system but the fund return projects were not vitalized up until now. In this study, 35 of ongoing and finished fund return projects were investigated on their types, sites, costs, local governments, and time required to return the fund. Through the on-site survey of 9 finished projects (4 biotope, 2 corridor and 3 natural conservation facility projects), construction and management conditions were investigated. The main findings are as follows: Among the five fund return types, 17 cases were biotope restoration projects, 4 cases were ecological corridor projects, and 1 case was a nature replacement project. In the case of project sites, there were 14 cases near schools and public facilities, 8 cases near rivers or streams, and 2 cases near ponds or wetlands. For the construction costs, there were 19 cases (65% of all the projects) that cost less than 300 million won. In terms of the involvement of the local government, most of the fund return projects were concentrated in Gyeonggi province and Ulsan city, and there were some local governments outside of these regions that did not carry out any return projects at all. Lastly, in the case of fund return time required, 35% of the fund returns were completed within 5 months, but the overall average fund return time was 9.8 months. In respond to the above study results, the improvement plans to encourage fund return projects are as follows: To diversify return types and sites, piloting and modeling projects for the representative types and sites should be preceded. To emerge from customary small-scaled projects, incentives to encourage large-scale and ecological networking projects should be considered. In addition, in order to write up business plans for the fund return projects, long-term investigations of at least 2 seasons from spring to fall are necessary. Finally, for the continuous management and maintenance of the ecological fund return sites, easier way for the citizens to actively participate in the projects should be incorporated.

• 한국해안·해양공학회논문집
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• 제22권2호
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• pp.120-125
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• 2010

재현기간에 따른 설계파고 산정시 Gumbel 극치분포함수의 축척모수와 위치모수를 확률변수로 고려할 수 있는 Monte-Carlo 모의법을 제안하였다. 축척모수의 불확실성의 정도에 따라 설계파고의 불확실성의 정도가 결정되며 그 분포형태는 Gumbel 분포함수를 따른다. 또한 내용년수에 해당하는 최대 유의파고 분포특성을 이용하여 재현기간에 따른 설계파고를 산정하는 경우에 더 많은 불확실성이 포함된다. 한편 피복재의 파괴모드에 대한 신뢰성 해석을 수행하여 설계파고의 불확실성에 대한 영향을 검토하였다. 설계파고의 불확실성을 고려하는 방법에 따라 재현기간 50년 동안 5% 피해수준에 해당하는 파괴확률을 산정하여 비교하였다. 설계파고의 불확실성이 년 최대 유의파고자료의 불확실성과 같다고 가정하면 파괴확률이 넓은 범위에 걸쳐서 산정된다.

• 한국항해항만학회지
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• 제42권2호
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• pp.143-152
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• 2018

Currently, there are very few papers that have examined the efficiency of Vietnamese ports. Of those that have, some of them take into account only a few container ports in Northern Vietnam. Others focus on comparing all types of ports in Vietnam with regard to the differences in efficiency scores when applying different methods to evaluate efficiency. However, there is no paper that specifically analyzes the efficiency of Vietnamese container ports throughout the country or that compares Vietnamese container ports with those of other countries in terms of efficiency. In order to provide more accurate and interesting information for container port authorities, in this study, 21 major Vietnamese container ports and seven major Korean container ports are selected and examined with regard to their levels of efficiency in 2016 using data envelopment analysis (DEA). This paper applies both constant return to scale (CRS) and variable return to scale (VRS) to explore the differences among overall technical efficiency, pure technical efficiency, and scale efficiency of the selected container ports. This study also indicate slacks and sets projections for inefficient ports.

• 한국항공운항학회지
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• 제15권2호
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• pp.40-47
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• 2007

Poor visibility is very important information in aviation meteorology factor, because secure safety, trust and economical efficiency increase for aircraft movements. The Incheon International Airport 4 years recent times was to period aircraft movements delay and cancellation due to meteorology is 52% and 30%. And then fog is 63% and 43% in meteorology factor. Therefore, the analysis against the economic loss size of an airline due to the fog is necessary. This study is indirectly estimated economic disaster scale of flight return and cancellation due to the fog in the Incheon International Airport from 5 to 6 March 2006. This is based on an aviation operational statistics data and meteorology observation data. Result of estimated, total 14 flights return to Gimpo, Jeju and Gimhae in this period are about 208,205,700 won. And estimated total 10 flights cancellation are about 718,657,000 won.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.548-551
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• 2004

Magnetostrictive actuators have seen increasing use in fine positioning system because it has many advantages such as friction free, resolution of ${\mu}{\textrm}{m}$ or nm scale, and powerful output force. Usually, the magnetic circuit of magnetostrictive actuator has components which are flux return path, coil, and magnetostrictive material. It is classified in two types according to existence of the permanent magnet. The magnetic circuit having optimal performances transfer magnetic field which is obtained by providing input current at coil without energy loss. This paper described mathematical model of magnetic circuit for getting design variables. The modeling equation is obtained from the relations between flux and reluctance of the magnetic equivalent circuit. Also, finite element analysis has been used to study the performance of magnetic circuit according to change of design variables such as existence and shape of the permanent magnet, flux return path etc. The modification of dimensions enables us to optimize magnetic circuit.

• 자원ㆍ환경경제연구
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• 제15권2호
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• pp.177-200
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• 2006

최근 수확불변 하에서의 오염처리비용회피활동(pollution haven activities)에 대한 연구는 많이 진행되어 왔으나 수확체증 하에서의 연구는 미미한 실정이다. 1990년대 이후 수확체증 하에서의 교역이론이 산업 재배치에 대한 문제를 다루면서 수확체증과 오염처리비용회피활동 간의 관계를 살피는 것은 의미 있는 일이다. Davis (1998)가 발표한 수확체증 하에서의 자국시장효과(home market effect)에 대한 모형을 응용하여 환경정책이 산업 재배치에 주는 효과를 분석한 결과 시장규모가 적은 지역에서 오염물처리에 대한 책임을 생산자가 담당하는 지역과 시장규모가 크면서 오염물로 인한 비효용을 거주자가 감내하는 지역과의 교역상황에서 교역장벽이 높을 때 일부 공해산업에 대해 오염처리비용회피효과가 존재하나 교역장벽이 낮아지면서 공해산업뿐만 아니라 저공해산업에서도 산업의 지역이탈이 관찰되어 오염처리비용회피활동에 대한 식별이 힘들어지며 오염처리비용회피효과(pollution haven effect)뿐만 아니라 오염처리비용회피가설(pollution haven hypothesis)이 동시에 성립됨을 보일 수 있었다. 따라서 시장규모가 작으나 환경보전가치가 높아 환경규제가 강한 지역에서 환경보전과 지역경제발전을 동시에 도모하기 위해서는 오염처리기술의 생산성을 높이기 위한 활동이 필수적이다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2004년도 추계학술대회
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• pp.191-196
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• 2004

본 연구는 우리나라 RCC/RSC의 효율성을 전체 기술적 효율성, 순수 기술적 효율성과 규모의 효율성으로 구분하여 측정 평가하였다. RCC/RSC의 전체 기술적 효율성은 평균 $91.03\%$ 수준이었으며, 순수 기술적 효율성은 $96.80\%$로 나타났고 규모의 효율성은 $93.83\%$로 전체 기술적 비효율성이 가장 높게 나타났으며 이것은 생산규모에 따른 비효율성보다는 자원의 비효율적인 운영에 따른 효율성에 큰 문제가 있는 것으로 판단된다. 또한 규모에 대한 수익체감은 통영RSC, 수익체증은 인천, 태안, 군산, 여수, 울산, 동해 등의 RCC/RSC로 나타났다. 그리고 비효율적인 RCC/RSC는 준거집단을 참조하여 벤치마킹올 해야 한다.

• 한국항해항만학회지
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• 제29권3호
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• pp.215-220
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• 2005

본 연구는 우리나라 RCC/RSC의 효율성은 전체 기술적 효율성, 순수 기술적 효율성과 규모의 효율성으로 구분하여 측정 평가하였다. RCC/RSC의 전체 기술적 효율성은 평균 $91.03{\%}$ 수준이었으며, 순수 기술적 효율성은 $96.80{\%}$로 나타났고 규모의 효율성은 $93.83{\%}$로 전체 기술적 비효율성이 가장 높게 나타났으며 이것은 생산규모에 따른 비효율성보다는 자원의 비효율적인 운영에 따른 효율성에 큰 문제가 있는 것으로 판단된다. 또한 규모에 대한 수익체감은 통영RSC, 수익체증은 인천, 태안, 군산, 여수, 울산, 동해 등의 RCC/RSC로 나타났다. 따라서 효율성이 낮은 RCC/RSC는 효율성이 높은 준거집단을 참조하여 벤치마킹을 해야 한다.