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강성수,조성근,Kang, Sung-Soo,Cho, Seong-Keun 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.6
To achieve the structural safety of the vehicle, designs in various cases are carried out by using CATIA program. It is promoted the relaxation of stresses by collisions from the front portion, the side part and the rear portion of the vehicle. In this study, we conduct a variety of design of frames for the light weight frame of the vehicle and structural analysis, to protect the driver by adding reinforced frame. In the case of such a collision, there are maximum stresses greater than yield strength of steel and a very large local plastic deformation at the collision part.
토양 질산태질소 함량에 따른 시설 잎들깨 질소 웃거름시비량 추천
강성수(Seong-Soo Kang),이주영(Ju-Young Lee),성좌경(Jwa-Kyung Sung),공효영(Hyo-Young Gong),정형진(Hyung-Jin Jung),박장환(Chang-Hwan Park),윤여욱(Yeo-Uk Yun),김명숙(Myung-Sook Kim),김유학(Yoo-Hak Kim) 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.6
재배기간이 긴 잎들깨 시설 촉성재배 조건에서 질소시비 수준별 시험을 통하여 토양의 질산태질소 함량에 따른 질소 웃거름시비량 결정기준을 설정하였다. 잎들깨 주산단지인 금산과 밀양 두 지역에서 각각 1개의 시설하우스에서 질소시비량 5수준과 관행구를 난괴법 3반복과 4반복으로 각각 실시하였다. 생육시기별로 매달 건물중과 질소흡수량, 마디생 장량을 조사하였고, 토양질산태질소를 분석하였다. 금산포장의 마디당 질소 요구량은 2.2 kg 10a<SUP>-1</SUP>, 밀양포장은 3.5 kg 10a<SUP>-1</SUP>로 조사되었다. 토양질산태질소의 하한기준은 금산포장과 밀양포장 모두 NO₃-N 10 mg kg<SUP>-1</SUP>로 설정하였다. 상한기준 설정은 토심 15 cm, 용적밀도 1.2 Mg m<SUP>-3</SUP>, 토양 중 질산태질소의 이용율 70%를 적용하여 잎들깨 1마디에 필요한 질소요구량을 충족하는 수준으로 결정하여 금산포장과 밀양포장 각각 30 mg kg<SUP>-1</SUP>과 40 mg kg<SUP>-1</SUP>로 설정하였다. 따라서 금산지역은 Y=-0.157X + 4.71에 의해, 밀양지역은 식 Y=-0.1667X + 6.6667에 의해 잎들깨 1마디 생육에 필요한 질소 웃거름 시비량을 결정할 수 있었다. This study was conducted to recommend nitrogen (N) top dressing based on soil nitrate content for leaf perilla under forcing culture in Gumsan-gun and Milyang-si. Experimental design was the randomized complete block design for five N fertilization levels and conventional fertilization. Dry weight, nitrogen uptake, and the node number of leaf perilla were measured and soil nitrate contents were analyzed monthly. The amount of nitrogen uptake for growth of a node with two leaves was 2.2 kg 10a<SUP>-1</SUP> for Gumsan site and 3.5 kg 10a<SUP>-1</SUP> for Milyang site. Lower level of soil nitrate N concentration for standard N fertilization was determined as 10 mg kg<SUP>-1</SUP> for both sites. Soil depth, bulk density, utilization rate of soil nitrate N, and the amount of N uptake for growth of a node with two leaves were considered for calculation of upper level of soil nitrate N concentration. The upper levels of soil nitrate N concentration for no N fertilization were determined as 30 mg kg<SUP>-1</SUP> for Gumsan site and as 40 mg kg<SUP>-1</SUP> for Milyang site. Consequently the recommendation equations for the N top dressing were Y=-0.157X+4.71 for Gumsan site and Y=-0.1667X+6.6667 for Milyang site.
시설재배지에 질소관비 농도가 오이생육과 질산태 질소에 미치는 영향
강성수(Seong Soo Kang),김명숙(Myung Sook Kim),공명석(Myung Seok Kong),김유학(Yoo Hak Kim),오택근(Taek-Keun Oh),이창훈(Chang Hoon Lee) 충남대학교 농업과학연구소 2014 농업과학연구 Vol.41 No.4
To evaluate the impact of nitrogen fertigation on crop growth and NO3-N concentration in the soil solution, field experiment for cucumber cultivation during spring and fall season were carried out in on-farm located in Byeongcheon-myeon, Chunan-si, Chungcheonnam-do. Supplying nitrogen of 120-150 mg/L by fertigation device into soil per week reached to maximum yields of cucumber fruits. However, cucumber growth did not show any significant difference between nitrogen levels. Nitrogen supply of 400 mg/L, highest N levels, did not affect cucumber growth. Difference between green values of cucumber leaves using RGB scores were closely related with cucumber yields, and therefore, this results suggests that green values of cucumber leaves could be used as a way of determining the application rates of nitrogen for cucumber cultivation period under fertigation system.