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        • Adaptive Clustering Algorithm for Recycling Cell Formation:An Application of the Modified Fuzzy ART Neural Network

          박지형,서광규 한국데이타베이스학회 1999 공동학술대회 Vol.1 No.1

          The recycling cell formation problem means that disposal products are classified into recycling pact families using group technology in their end of life phase. Disposal products have the uncertainties of product status by usage influences during product use phase and recycling cells are formed design, process and usage attributes. In order to treat the uncertainties, fuzzy set theory and fuzzy logic-based neural network model are applied to recycling cell formation problem for disposal products. In this paper, a heuristic appeach for fuzzy ART neural network is suggested. The modified Fuzzy ART neural network is shown that it has a great efficiency and give an extension for systematically generating alternative solutions in the recycling cell formation problem. We present the results of this approach applied to disposal refrigerators and the comparison of performances between other algorithms. This pipes introduced a procedure which integrates economic and environmental factors into the disassembly of disposal products for recycling in recycling cells. A qualitative method of disassembly analysis is developed and its aim is to improve the efficiency of the disassembly and to generated an optimal disassembly which maximize profits and minimize environmental impact. Three criteria established to reduce the search space and facilitate recycling opportunities.

        • KCI등재

          Characteristics of Upper Gastrointestinal Tract Involvement in Korean Pediatric Crohn’s Disease: A Multicenter Study

          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.

        • KCI등재

          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.

        • KCI등재

          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.

        • 신보호주의의 등장과 세계무역체제 한국의 대응

          박지형 서울대학교 경제연구소 2017 서울대학교 경제연구소 학술대회 논문집 Vol.2017 No.-

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

        • KCI등재

          Changing C-N Interactions in the Forest Floor under Chronic N Deposition: Implications for Forest C Sequestration

          박지형 한국생태학회 2008 Journal of Ecology and Environment Vol.31 No.3

          Atmospheric N deposition has far-reaching impacts on forest ecosystems, including on-site impacts such as soil acidification, fertilization, and nutrient imbalances, and off-site environmental impacts such as nitrate leaching and nitrous oxide emission. Although chronic N deposition has been believed to lead to forest N saturation, recent evidence suggests that N retention capacity, particularly in the forest floor, can be surprisingly high even under high N deposition. This review aims to provide an overview of N retention processes in the forest floor and the implications of changing C-N interactions for C sequestration. The fate of available N in forest soils has been explained by the competitive balance between tree roots, soil heterotrophs, and nitrifiers. However, high rates of N retention have been observed in numerous N addition experiments without noticeable increases in tree growth and soil respiration. Alternative hypotheses have been proposed to explain the gap between the input and loss of N in N-enriched, C-limited systems, including abiotic immobilization and mycorrhizal assimilation, both of which do not require additional C sources to incorporate N in soil N pools. Different fates of N in the forest floor have different implications for C sequestration. N-induced tree growth can enhance C accumulation in tree biomass as observed across temperate regions. C loss from forests can amount to or outweigh C gain in N-saturated, declining forests, while another type of ‘C-N decoupling’ can have positive or neutral effects on soil C sequestration through hampered organic matter decomposition or abiotic N immobilization, respectively. Atmospheric N deposition has far-reaching impacts on forest ecosystems, including on-site impacts such as soil acidification, fertilization, and nutrient imbalances, and off-site environmental impacts such as nitrate leaching and nitrous oxide emission. Although chronic N deposition has been believed to lead to forest N saturation, recent evidence suggests that N retention capacity, particularly in the forest floor, can be surprisingly high even under high N deposition. This review aims to provide an overview of N retention processes in the forest floor and the implications of changing C-N interactions for C sequestration. The fate of available N in forest soils has been explained by the competitive balance between tree roots, soil heterotrophs, and nitrifiers. However, high rates of N retention have been observed in numerous N addition experiments without noticeable increases in tree growth and soil respiration. Alternative hypotheses have been proposed to explain the gap between the input and loss of N in N-enriched, C-limited systems, including abiotic immobilization and mycorrhizal assimilation, both of which do not require additional C sources to incorporate N in soil N pools. Different fates of N in the forest floor have different implications for C sequestration. N-induced tree growth can enhance C accumulation in tree biomass as observed across temperate regions. C loss from forests can amount to or outweigh C gain in N-saturated, declining forests, while another type of ‘C-N decoupling’ can have positive or neutral effects on soil C sequestration through hampered organic matter decomposition or abiotic N immobilization, respectively.

        • KCI등재

          재활용 장애시의 생활폐기물 처리시설용량 평가에 관한 연구

          박지형,황용우,민달기 한국폐기물자원순환학회 2018 한국폐기물자원순환학회지 Vol.35 No.5

          Local government should have waste treatment facilities to provide good service to local residents, even though private recycling is working. There was a problem with plastic waste management in Korea in 2018. Therefore, study was conducted on whether local government has the capacity to handle additional waste streams. The study was conducted, solely using government statistics, on domestic mixed solid waste. The amount of additional plastic waste to be disposed was 2,418 ton/day (incinerate 713 ton/day + landfill 1,705 ton/day), and paper waste was 4,469 ton/day (incinerate 1,104 ton/day + landfill 3,365 ton/day). Current incinerator capacity is sufficient, and if paper waste is added, the incinerator capacity is found to be under1,544 ton/day. Landfill capacity is sufficient even if plastic and paper waste is added, but the residual life of the landfill was reduced from 31.4 years to 25.4 years. Regionally, Gyeongbuk, Daejeon, Jeju, and Sejong should develop new plans for waste management.

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