http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
서남해안(西南海岸) 간석지토양(干潟地土壤)의 특성(特性)에 관(關)한 조사연구(調査硏究)
심재환,정정화,안열,Shim, Jae-Hwan,Jung, Jung-Hwa,An, Yeul 한국토양비료학회 1989 한국토양비료학회지 Vol.22 No.4
서남해안(西南海岸)에 분포(分布)되어 있는 간척가능지(干拓可能地) 442,000ha에 대(對)한 토성별(土性別) 분포현황(分布現況)과 물리화학적(物理化學的) 특성(特性)을 조사(調査) 분석(分析)하고 토양(土壤) 성숙(成熟)에 따라 일어나는 상상(像想) 침하량(沈下量)에 대(對)하여 연구(硏究)한 결과(結果)를 요약(要約)하면 다음과 같다. 1. 기존간척지(旣存干拓地) 257,000ha의 토성별(土性別) 분포면적(分布面積)은 미사식양질(微砂埴壤質) 53.0%, 미사사양질(微砂砂壤質) 36.0%, 사질(砂質) 6.0%, 사양질(砂壤質) 5.0% 이다. 2. 간척가능지(干拓可能地) 442,000ha의 토성별(土性別) 분포면적(分布面積)은 미사식양질(微砂埴壤質) 51.0%, 사질(砂質) 20.0%, 사양질(砂壤質) 15.0%, 징사식양질(徵砂埴壤質) 14.0%이며 지역별(地域別) 분포(分布)는 경기(京機)와 전남(全南)은 미사질계토양(微砂質系土壤), 전북(全北)은 조립질토양(粗粒質土壤), 충남지역(忠南地域)은 각종토성(各種土性)이 고르게 분포(分布)되어 있다. 3. 간척가능지토양(干拓可能地土壤)은 염도(鹽度)(EC) 46~51mmhos/cm, E.S.P 25~60%, pH 7.5~8.0으로 U.S.Salinity Lab의 염류토양(鹽類土壤) 분류(分類)로 함염(含鹽)Alkali토와(土) 유사(類似)하다. 4. 간척가능지(干拓可能地)를 농경지(農耕地)로 개발(開發)할때 예상(豫想)되는 침하량(沈下量)은 미사질양토(微砂質壤土) 18.0%, 치사질식양토(徵砂質埴壤土) 21.0%이다. The soil texture and the physico-chemical characteristics of 442,000ha reclaimable tide land in the south-western of korean peninsular were analysed. The subsidence which may occur as the soil ripened was studied. The results were as follows : 1. Among the 257,000ha of existing reclaimed tidal land 53.0% was tine silty soil and 36.0% coarse silty, 6.0% coarse loamy and 5.0% sandy soils, respectively. 2. Out of the total 442,000ha of reclaimable tidal land, 51.0% was coarse silty soil, and 20% sandy, 15.0% coarse loamy and 14.0% fine silty textural family, respectively. The coarse silty deposits were mainly distributed in the Gyeong gi and Jeonnam coast, while the coarse deposits(Coarse Loamy-sandy) exist in the Jeonbuk coastal area, but in the Chungnam areas there were various textural grades. 3. Reclaimable tidal Land in the south-western part of the peninsular was Classified into saline and alkaline soil. Electric Conductivity in saturation extract was extremely high that was 46~51 mmhos/cm, E.S.P was more than 25% and pH was ranged around 7.5~8.0 4. Reclaimed to cultivated field the subsidence reclaimable tide land to be expected when was about 18% in Soil and 21% in Sicl soils calculated down to 1.25m of the profile.
심재환(Jae-hwan Shim),한성길(Sun Gil Han),신유인(Yoo In Shin),윤찬헌(Chan Heon Yoon),송철기(Chul Ki Song) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Planetary gear systems are used in driving system of excavators as reduction gear and widely used in industrial field such as transmission in automobile, machine tools, semiconductor equipment and so on. Planetary gear systems have advantages of high power density, large reduction in a small volume, multiple kinematic combinations, and axial direction of power path. Gears in planetary gear systems sometimes get short-life due to wear and breakage by repetitive load during operation time. In this paper, the strength design evaluation for the planetary gear system was performed to make sure the gears’ stability and durability during operation time.