• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.795-799
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• 2012

기후변화의 영향으로 인해 전 지구적으로 강우의 시 공간적 패턴이 변화하고 있으며, 우리나라의 경우 강우일수는 줄어들고 강우량은 증가하는 양상을 보일 것으로 전망하고 있다. 이는 강우현상이 발생할 경우 그 강도가 과거와 비교하여 강해지며, 가뭄 역시 그 심도가 보다 심각해질 수 있음을 의미한다. 이와 같이 기후변화에 의한 강우의 양상이 과거와 이질적으로 변화하고 있으므로 이를 고려한 물관리분야의 적응대책의 수립이 필요하다. 이를 위해서는 기후변화 영향에 따른 각 지역별 취약성 평가가 선결되어야 하며, 그 결과에 근거한 적응대책의 수립이 필요하다. 따라서 본 연구에서는 환경부 국립환경과학원에서 개발한 CCGIS를 이용하여 전라남도 22개 시 군의 물관리분야에 대한 취약성 평가를 수행하였다. CCGIS는 다양한 기후변화 시나리오 중 A1B 시나리오를 바탕으로 하고 있다. 치수의 취약성, 이수의 취약성, 수질 및 수생태에 대한 취약성을 대용변수(기후노출, 민감도 및 적응능력)를 이용하여 현재와 미래시점에 대하여 평가하였다. 먼저, 현재시점에서 전라남도 22개 시 군의 치수에 대한 취약성 평가 결과를 보면, 보성군이 가장 취약한 것으로 나타났으며, 나주시가 가장 양호한 것으로 분석되었다. 또한, 현재시점의 이수에 대한 취약성 평가에서는 목포시의 취약성이 타지역에 비해 현저히 높은 것으로 나타났으며, 고흥군이 가장 양호한 것으로 분석되었다. 수질 및 수생태에 대한 취약성 평가에는 구례군이 가장 취약하며, 목포시가 가장 양호한 것으로 나타났다. 미래시점(2050년대)의 치수에 대하여 상대적으로 취약한 지역은 순천시, 광양시, 구례군으로 조사되었으며, 따라서 이에 대한 방안 마련이 필요한 것으로 판단된다. 이수에 대해 상대적으로 취약한 지역은 목포시로 나타났으며, 전라남도 전역에 걸쳐 이수에 대한 취약성이 미래로 갈수록 낮아지는 경향을 보이고 있다. 수질 및 수생태에 대한 취약성 평가의 결과는 시 공간적으로 큰 변동이 없는 것으로 평가되었다.

• Transactions of Materials Processing
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• v.28 no.2
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• pp.98-104
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• 2019

The present study numerically simulates the deformation heterogeneity developed in AA1100 during multi-axial diagonal forging (MADF) using finite element analysis (FEA). Diagonal forging type consisting of diagonal forging (DF) and return-diagonal forging (R-DF) proved to be relatively beneficial compared to plane forging type which includes plane forging (PF) and return-plane forging (R-PF) for minimizing the non-uniformity of deformation developed in workpieces. Simulation of the effective strain generated in workpieces during the two types of forging was done using 3-D FEA. FEA shows the effect of friction coefficient on the deformation behavior on workpieces. The simulation of 2 types forging with different friction coefficients revealed that the magnitude of barreling effect and strain heterogeneity in workpieces increases with an increase in the friction coefficient.

• Korean Journal of Metals and Materials
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• v.46 no.3
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• pp.135-143
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• 2008

The inhomogeneous texture through the thickness direction can be developed during hot rolling deformation in aluminum alloy. In this study, the inhomogeneous texture evolution through the thickness direction during hot rolling deformation in Al-5 wt%Mg alloy produced by a new strip casting technology was measured experimentally. Macrotexture measurement was conducted using X-ray diffractometer. A finite element analysis with ABAQUS/StandardTM and rate sensitive polycrystal model were used to predict the evolution of hot rolling texture. The experimental results of Al-5 wt%Mg alloy were compared with calculated results. The shear texture components tend to be increased at the surface region of the hot-rolled specimen. It is found that triclinic sample symmetry is more accurate assumption for texture analysis and simulation in the surface region of hot-rolled aluminum alloy.

• Korean journal of applied entomology
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• v.61 no.3
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• pp.513-517
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• 2022

An investigation of the severe destruction of wood ear mushroom (Auricularia auricula-judae), which were commercially cultivated in a plastic house in Hwabuk-myeon, Jeju-si, South Korea from April to August 2021, revealed a tenebrionid beetle subsequently identified as Platydema takeii Nakane, 1956 (Coleoptera: Tenebrionidae: Diaperinae). To the best of our knowledge, this is the first report of a tenebrionid species infesting commercially cultivated mushrooms in South Korea. The damage symptoms and diagnosable characteristics of adults and larvae of P. takeii are provided in this study.

• Transactions of Materials Processing
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• v.32 no.5
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• pp.268-275
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• 2023

ISO 21029 cryogenic vessel is used to transport cryogenic fluids. High-manganese steel (High-Mn steel) is widely regarded as suitable for use at cryogenic temperatures. The conventional way of manufacturing an ellipsoidal vessel head involves incremental stretching, followed by a spinning process. In this study, an alternative method for forming an ellipsoidal vessel head was proposed. Finite element analysis (FEA) was used to theoretically examine the strain evolution during a multi-stage forming process, which involved progressive stretching, deep drawing, and spinning of High-Mn steel. The distribution of effective strain and strain components were analyzed at different regions of the formed part. The FEA results revealed that only normal strains were evident in the dished region of the vessel head due to the stretching process. However, the flange region experienced complex strain evolution during the subsequent deep drawing and spinning process.

• Journal of the Economic Geographical Society of Korea
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• v.23 no.1
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• pp.93-109
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• 2020

The purpose of this study is to examine the effects of industrialization and urbanization of Gwangyang Bay Region on the change of urban system and spatial structure between triangle-cities located in Gwangyang Bay, Yeosu City, Suncheon City, and Gwangyang City, one of the famous industrial zones in Korea. Large-scale development projects carried out by the central government in the Gwangyang Bay Region such as construction of the Second Oil Refinery in the mid-1960s, completion of the POSCO Gwangyang Steelworks in the mid-1980s, construction of the Gwangyang Port Container Terminal in 1987 and designation of the Gwangyang Bay Area Free Economic Zone in 2003, and EXPO 2012 Yeosu Korea, affected to changes of the urban system and spatial structure between triangle-cities in Gwangyang Bay Region. The above four-development projects transformed the urban and spatial structures between the three cities in the Gwangyang Bay Region from a mononuclear urban system centered on Suncheon to a network city system. Historically, Suncheon has served as an exclusive center in the eastern region of Jeonnam, including the Gwangyang Bay Region. However, the hosting of the 2012 Yeosu Expo Korea is reorganizing the three cities into a network-type spatial structure with the strengthening of connectivity and integration in the region. And this trend is expected to intensify in the future.

• Proceedings of the Korean Society of Crop Science Conference
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• 2018.10a
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• pp.95-95
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• 2018

• Proceedings of the Korean Society of Crop Science Conference
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• 2018.10a
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• pp.101-101
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• 2018

• Proceedings of the Korean Society of Crop Science Conference
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• 2018.10a
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• pp.106-106
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• 2018

• Proceedings of the Korean Society of Crop Science Conference
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• 2018.10a
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• pp.105-105
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• 2018