레일장대화는 무도상교량의 소음, 진동, 충격 등의 문제점을 해결할 수 있는 경제적인 방안 중 하나이며, 최근 연동식 침목고정장치 를 이용한 SSF 공법이 개발된 바 있다. 이 연구에서는 연동식 침목고정장치 적용 시 레일 높이 조정 및 열차 통과 시의 충격 흡수를 목 적으로 교량침목 하부에 삽입되는 침목패드의 최적 연직강성을 결정하는 과정을 제시하였다. 침목패드의 최적 연직강성 결정을 위하 여 관련 기존 기준을 검토하였으며, 유연다물체동적해석을 통하여 침목패드의 연직강성 변화에 따른 주행안전성, 승차감 및 궤도의 안전성에 대한 지표들과 교량 응답 변화를 검토하였다. 유연다물체동적해석은 상용프로그램인 ABAQUS와 VI-Rail을 이용하여 수행 하였다. 수치해석은 30m 상로판형교에 대한 교량모델을 이용하여 수행하였으며, 침목패드의 연직강성이 7.5kN/mm ~ 240kN/mm로 변화할 때 ITX 새마을, KTX 및 화차 통과 시의 응답을 산정하였다. 수치해석에 적용된 궤도구성품 조건에서 침목패드의 최적 강성은 100kN/mm로 산정되었다.

철도 분기기는 결선부와 곡선부의 존재로 인하여 선로에서 가장 손상이 많이 발생하는 구간이며, 구조적 건전성을 유지관리하기 위하여 매년 상당한 비용이 투입되고 있다. 레일연마는 이러한 분기기의 레일 손상을 감소시켜 유지관리 비용을 저감할 수 있는 방안 중 하나로 알려져 있으나, 현재까지 국내에서는 분기기 레일 연마를 통한 유지관리 비용 절감 효과를 정 량적으로 연구한 사례가 거의 없는 상황이다. 이 논문에서는 분기기 레일 연마를 통한 유지관리 비용 절감 효과를 다물체 동적 해석프로그램인 VI-Rail을 이용하여 검토하였다. 레일 연마 효과는 레일 표면의 조도를 이용하여 모사하였으며, VI-Rail 프로 그램의 Flextrack 모델을 이용하여 차량-궤도 상호작용해석을 수행하였다. 수치해석은 60kg #8 분기기와 EMU 차량 모델을 이용 하여 수행하였으며, 레일 표면 조도는 실제 궤도에서 측정된 값을 기반으로 작성한 PSD 함수를 이용하여 모사하였다. 해석 결 과 레일 연마는 분기기 레일의 피로 수명을 6.5% 가량 증가시키는 것으로 나타났다.

South Korea is the only country that has switched its statue from a recipient of aid to a donor country that offers aid. After joined OECD/DAC in 2009, other countries are growing interest about ODA of Korea. In particular, food & agriculture cooperation initiative which is multilateral ODA of RDA in Korea is differentiated bilateral ODA. Therefore, other countries was growing interset about performance of ‘food & agriculture cooperation initiative’ Accordingly, purpose of this study is to find out the recipient countries economic effects of ‘Water management of rce project’ and ‘Cacao project’ among 3 project that are bring worked on by ‘Korea-Latin America Food & Agriculture Cooperation Initiative(KoLFACI)’ established in 2014. The best result obtained from KoLFACI projects was that project performance was significantly great despite small scale of budget invested. Economic ripple effect of water management of rice project was estimated as approximately USD 20,014,377 for upcoming 9 years in Peru and USD 6,081,463 for upcoming 9 years in Colombia. In Guatemala, economic ripple effect of training activities via cacao project was estimated USD 27,258 for project period(4 years). Also, the effect of fermentation and dry technology about Cacao in Colombia presume result. Estimation result, fermentation and dry technology effect was estimated USD 2,177,152 in Colombia upcoming 9 years. It means that KoLFACI project was technology development and distribution-centered, small scaled project with annual USD 20,000 ~ 30,000 budget, of which economic ripple effect was great in terms of low cost and high efficiency ODA project. We will search for ongoing methods that contribute to the role expansion of Korea and the agricultural development of the recipient country will be needed through the expansion and complementation of a low-cost and high efficiency ODA project such as the KoLFACI project.

The purpose of this study is to find out the economic impacts of the CASSAVA project, IPM project, Post-Harvest project, and RICE project among 12 projects that are being worked on by the Asian Food & Agriculture Cooperation Initiative(AFACI) established in 2009. Reliable data such as FAO STAT etc. was utilized for the analysis on the economic impacts of each project and the data of an investigation on principal investigators of the nation who participate in each project was used for the analysis of the additional necessary information. According to the economic impacts analysis result, the economic impacts will occur and can be measured as an economic costs as follows: a total of $1,187,404 in Thailand for the next 19 years through the CASSAVA project, $2,358,299 in Indonesia for the next 18 years through the Post-Harvest project, $62,451,317 in Vietnam for the next 13 years through the Post- Harvest project and $60,629,555 in Nepal for the next 13 years through the RICE project. The AFACI project is a small project that annually supports each country that participates each project with approximately $ 10,000. Despite the small-scale project, the estimated result of economic impacts showed that great economic impacts occurred for its scale of the support. Thus, it is deemed that a search for ongoing methods that contribute to the role expansion of Korea and the agricultural development of the recipient country will be needed through the expansion and complementation of a low-cost and high efficiency Official Development Assistance(ODA) such as the AFACI project.

This study aimed to analyze socioeconomic effect of eco-friendly free school food supply system by Seoul, which has been consistently extended since 2011. To do so, effect of eco-friendly free school food supply system on the beneficiaries, Seoul citizens, was analyzed by using ‘labor & income panel’, while that on rural society was analyzed by using the surveys on the eco-friendly agricultural product supply performance by the ‘Eco-friendly Agricultural Products Retail Center’ as well as for students, school parents, nutrition teachers and nutritionists. The results of analysis showed that eco-friendly school food supply system contributes to income redistribution among the Seoul citizens to a certain extent, provides the eco-friendly agricultural product producers in the rural society with the stable market, and positively influences them to secure stable incomes. In addition, eco-friendly free school food reduced the amount of carbon emissions through the use of environmentally friendly agricultural products resulting in environmental improvements and economic benefits. Considering such effects, free school food supply using the eco-friendly agricultural products needs to be consistently maintained in the future without politic change by political ideology and to be extended to middle school level in medium and short-term.