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김해 율하 지역 화분분석을 통한 홀로세 중기 이래 고환경 복원
황상일 ( Hwang Sangill ),황범진 ( Hwang Beomjin ),윤순옥 ( Yoon Soon-ock ) 한국지형학회 2017 한국지형학회지 Vol.24 No.2
The paleo-environments including changes in vegetation, climate, and sea level since the middle Holocene(6,400(?)-1,800(?) yr BP) were reconstructed with the special reference to pollen analysis from two trench samples at Yulha-dong, Kimhae-si, southern Korea. The environmental characteristics by the pollen zonation was summarized as follows: Pollenzone I(6,400(?)~3,940(?) yr BP) showed the dominance of Quercus species with broad-leaved trees, it was warm condition. Pollenzone II(3,940(?)~2,300(?) yr BP) was characterized to the yellow soil indicating terrestrial environment. Moreover, it showed Alnus-NAP period related to the extension of agriculture and deforestation by the rapid decrease of Quercus and increase of Gramineae. Pollenzone III(2,300(?)~1,800(?) yr BP) showed human impact from the increase of NAP and Pinus. Plenty of Quercus with deciduous broad-leaved trees also suggested warmer condition than before.
김기성(Kiseong Kim),한완희(Wanhee Han),윤영한(Younghan Youn),황범진(Beomjin Hwang) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Recently automobile market has been watched with deep concern about environmentally friendly vehicle for reducing environmental pollution. The environmentally friendly vehicle is excellent in energy efficiency ratio and the least vehicle in automobile exhaust fumes. The one of cause is weight in the energy efficiency ratio and exhaust fumes, etc. Because the weight of vehicle is getting heavier, the energy efficiency ratio becomes worse and the amount of exhaust fumes increases. In this paper, the magnesium seat back frame was designed to reduce the weight and improve the strength using sensitivity analysis. The magnesium seat is lighter than formal seat and better in anti-vibration. Also it is excellent for interception of electromagnetic waves, so it will be applied usefully in the electronic automobile. However the maximum stress of magnesium is lower than other material like steel so we studied to satisfy the qualification which is raised the strength and minimized the weight of the seat frame. A primary objective of the study is to develop a new magnesium seat back frame for the passenger car. Back moment analysis of the conventional steel seat frame was conducted as a base model. Back moment strength with the developed magnesium seat back frame were compared to those of the base model. Then this paper describes a study that was conducted to determine sensitivity of several design factors for finding main design factors to light weight and sustain strength as steel frame using the matrix of orthogonal arrays. The design factors that may have major effect on FEM simulations were selected and orthogonal array was set up for analysis. By the design matrix, the magnesium seat frame was analyzed using LS-DYNA. The performance sensitivities of magnesium seat frame are analyzed using Taguchi method. In conclusion, the proper strength was had in the magnesium seat frame with comparison of steel frame and this frame could be reduced the weight about 40% of the steel seat frame.