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박지형,남혜나,이지혁,홍지나,이대용,류일,전인상,차한 대한소아소화기영양학회 2017 Pediatric gastroenterology, hepatology & nutrition Vol.20 No.4
Purpose: Crohn’s disease (CD) can involve any site of the gastrointestinal tract (GIT). However, the characteristics of upper GIT involvement in CD are unclear, especially in the Eastern pediatric population. This study aimed to esti-mate the prevalence of upper GIT involvement and identify the clinical features of Korean children with CD.Methods: This was a retrospective multicenter cohort study that included 52 pediatric patients with CD who underwent esophagogastroduodenoscopy and biopsy. The clinical symptoms and endoscopic and histologic features of the upper GIT were identified according to the presence or absence of upper gastrointestinal symptoms. Results: Among the 52 patients, upper GIT involvement was noted in 50.0% (26/52). The mean age at CD diagnosis was 14.1±2.1 years. Gastric ulcer was the most common lesion (19.2%) found on upper GIT endoscopy, followed by duodenal ulcers (15.4%). Chronic inflammation was the most common histopathologic feature (75.0%), followed by gastric erosion (17.3%). Granuloma was found in 9.6% of patients. Helicobacter pylori infection was identified in 5.8% of patients. Endoscopic and histologic findings were not significantly different, but the mean values of eryth-rocyte sedimentation rate (60.7±27.1 vs. 43.0±27.6 mm/h, p=0.037) and C-reactive protein (16.5±28.2 vs. 6.62±13.4mg/dL, p=0.014) were significantly different between patients with and without upper gastrointestinal CD symptoms. Conclusion: Upper GIT involvement was relatively common in pediatric patients with CD irrespective of upper gastro-intestinal symptoms, and H. pylori infection was relatively uncommon. The results of this study should aid the estab-lishment of regional guidelines for upper GIT examination.
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Trade-induced Industrialization and Economic Growth
박지형 한국국제경제학회 2011 International Economic Journal Vol.25 No.3
Based on a modified Heckscher-Ohlin model of Deardorff and Park (20104. Deardorff , A. and Park , J.-H. 2010 . A story of trade-induced industrialization . International Economic Journal , 24 : 283 – 296 . [Taylor & Francis Online]View all references), this paper develops a dynamic model of trade-induced industrialization and economic growth. It shows that a developing country may grow out of its autarky steady state with no industrialization into a new steady state with full industrialization by opening to trade with a large industrialized country, exporting the labor-intensive intermediate input in exchange for the capital-intensive intermediate input for the modern good. Even when the developing country is on its path toward complete industrialization under autarky, free trade may induce it to grow faster with its return to capital being raised and sustained at a level that is higher than its autarky level during its industrialization process. Once it completes its industrialization process by having all of its resources in the modern sector, then diminishing returns to capital come back to accompany further capital accumulation, slowing down the growth of the economy. This trade-induced industrialization and economic growth, having an expansion of international trade both in its absolute value and in its ratio to the size of the developing country, correspond well with the dynamic profiles of East Asian Miracle countries’ economic growth based on their export-oriented industrialization strategy.
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LCA를 이용한 교량용 포트받침 환경영향 및 물발자국 분석
박지형,위대형,고광훈,황용우 대한토목학회 2018 대한토목학회논문집 Vol.38 No.6
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 22.4m3 H2O eq/kg for one direction pot bearing, 17.1m3 H2O eq/kg for fixed pot bearing, and 14.1m3 H2O eq/kg for all direction pot bearing. As a result of life cycle analysis, the contribution of water use inmanufacturing was more than 65% in all three types. The results of this study can be used as basic data for decision making inconstruction method and material selection of bridges in the future. 본 연구에서는 전과정평가 방법론을 활용하여 고정단, 일방향, 양방향 교량용 포트받침의 제조 공정에 대한 LCA분석을 수행하여 각각의 대한 환경부하를 분석하였으며, 특히 최근 국내외적으로 이슈가 되고 있는 물발자국에 대한 분석을 수행하였다. LCA 분석 결과 고정단 포트받침의 경우 6대 영향범주 모두에서 후판에 의한 기여도가 64.2% 이상으로 분석되었으며, 특히 자원고갈 및 광화학적산화물생성 영향범주에서는 94%이상의 기여도를 갖는 것으로 분석되었다. 일방향 및 양방향 포트받침의 경우 지구온난화 및 오존층 영향범주에서는 PTFE의 기여도가 가장 높게 분석되었으며, 그 외의 영향범주에서는 후판에 의한 기여도가 높게 나타났다. 포트받침 1개 제조시 형식별 물 이용가능 발자국 분석결과 일방향 22.4m3 H2O eq/ea, 고정단 17.1m3 H2O eq/ea, 양방향 14.1m3 H2O eq/ea 으로 분석되었다. life cycle 단계별 기여도 분석결과 3가지 유형 모두 제조단계의 용수 사용으로 인한 기여도가 65% 이상으로 분석되었다. 본 연구결과는 향후 교량 설계 및 시공단계의 공법 및 자재 선택시 의사결정 기초자료로 활용할 수 있을 것으로 판단된다.
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불확실성을 고려한 교통투자시설 의사결정 방법론 연구: ITS기반 인프라 구축사업 사례 중심
박지형,이혜진,서창범 한국교통연구원 2022 交通硏究 Vol.29 No.3
교통시설은 오랜기간동안 건설되고 운영된다는 점에서 운용 중에 다양한 불확실성이 발생한다. 특히 미래에는 교통시설투자 뿐만 아니라 교통정책과 교통기술에 대한 수요가 발생할 수 있으므로 교통투자평가 방법론이 필요항목에 따라 대응되어야 한다. 국외에서는 이미 의사결정 시 미래의 불확실성을 고려하고자 하는 다각적인 시도를 하고 있다. 본 연구는 불확실성을 고려하고 다양한 교통투자에 대한 의사결정을 보다 강건하게 수행하고자 다수의 의사결정 방법론을 고찰하였으며 PRIM 방법론 등을 적용한 시나리오 분석을 통해 그 결과를 검증하고자 하였다. 현재 예비타당성 평가에서는 고려하지 않는 교통정책의 추진, 투자 우선순위 등을 결정할 수 있도록 하기 위해 기존의 AHP구조를 기반으로 평가대상별 미래 불확실성 요인을 정의하고 전망 및 변동범위를 제시함으로써 미래 불확실성이 고려되도록 구성하였다. 또한 방법론의 적용가능성을 검토하기 위해 교통투자사업인 ‘광역도시간 ITS 인프라 및 C-ITS 기반 교통체계구축’ 시나리오를 가정하여 시나리오 분석을 수행하였다.
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상하수도시설에 대한 전과정관리(LCM)시스템 구축방안 연구
박지형,김영운,박광호,황용우 대한상하수도학회 2012 상하수도학회지 Vol.26 No.2
Water supply and sewerage systems are the large-scale urban infrastructure ejecting large amount of environmental load over the life-cycle. Therefore, it is important not only to optimize in the aspect of economical superiority and process efficiency but also to consider earth scale environmental impact. This study aimed to suggest the establishment of life cycle management(LCM) system as an integrated management solution in urban water supply and sewerage systems. As a result, the methodology for LCM system consisting of life cycle assessment(LCA), life cycle cost(LCC), life cycle CO2(LCCO2) and life cycle energy(LCE) was developed. Also, several case studies using the latest statistics data of water supply and sewerage systems were carried out to investigate the field applicability of LCM.
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