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CFRP 긴장재로 프리스트레트된 콘크리트보의 피로 거동
정상모 ( Jeong¸ S. M. ),이차돈 ( Lee¸ C. D. ),박상렬 ( Park¸ S. Y. ),조만영 ( Cho¸ M. Y. ),( Jeong¸ W. T. ),정우태 한국구조물진단유지관리공학회 2006 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.10 No.1
In the applications of FRP materials, it seems the most efficient to use them as pre-stressing tendons, considering their high strength. However, the lack of ductility is of most concern due to their linear elastic behavior up to rupture. In order to solve this ductility problem, a new concept of prestressed concrete beam is proposed, introducing internally un-bonded CFRP tendons. It is essential to verify the long-term safety for repetitive fatigue loads under service states, as well as the safety at the ultimate state. For this purpose, flexural fatigue loading tests were carried out for three test beams. The results showed that the beams prestressed with CFRP tendons had enough safety under fatigue loads, although additional more tests are required in the future.
CFRP 긴장재로 프리스트레트된 콘크리트보의 피로 거동
정상모(Jeong S.M.),이차돈(Lee C.D.),박상렬(Park S.Y.),조만영(Cho M.Y.),Ye Kyaw, 정우태(Jeong W.T.) 한국구조물진단유지관리학회 2006 한국구조물진단학회 학술발표회논문집 Vol.10 No.1
In the applications of FRP materials, it seems the most efficient to use them as pre-stressing tendons, considering their high strength. However, the lack of ductility is of most concern due to their linear elastic behavior up to rupture. In order to solve this ductility problem, a new concept of prestressed concrete beam is proposed, introducing internally un-bonded CFRP tendons. It is essential to verify the long-term safety for repetitive fatigue loads under service states, as well as the safety at the ultimate state. For this purpose, flexural fatigue loading tests were carried out for three test beams. The results showed that the beams prestressed with CFRP tendons had enough safety under fatigue loads, although additional more tests are required in the future.
Effect of Soil Physical Characteristics on Rhizome Rot Incidence of Platycodon grangiflorus
이영한,최용조,박상렬,김민근,조수정,윤한대,Lee, Young-Han,Choi, Yong-Jo,Park, Sang-Ryeol,Kim, Min-Keun,Cho, Soo-Jeong,Yun, Han-Dae 한국토양비료학회 2000 한국토양비료학회지 Vol.33 No.1
This study was conducted to determine the effect of soil physical characteristics on rhizome rot incidence of platycodon. Sampling sites were Keochang 4, Kimhae 7, Haman 6, Chinju 6 and Koseong 3 fields in Kyongnam province and Hongcheon 6 fields in Kangwon province. The root disease incidence rate was correlated with soil depth Y=-0.747X+88.19($R^2=0.394^{***}$), soil hardness Y=4.36X+8.93($R^2=0.201^*$), bulk density Y=104.7X-80.99($R^2=0.295^{**}$), clay content Y=1.24X+14.14($R^2=0.196^*$), porosity Y=-3.11X+215.9($R^2=0.220^*$) and silt content Y=-0.75X+67.85($R^2=0.178^*$). The yield was correlated with soil depth Y=0.263X+0.971($R^2=0.105^*$), clay content Y=-0.688X+32.74($R^2=0.158^*$), porosity Y=1.974X-93.19($R^2=0.231^{**}$) and silt content Y=53.05X-108.65($R^2=0.232^*$), The optimum cultivated land of perennial platycodon was soil depth over 1m, soil hardness under $5kg\;cm^{-2}$, bulk density $1.0Mg\;m^{-3}$, moisture content 13~17%. clay content 5~10%, porosity 58~63%, silt content 38~64% and soil texture of silt loam. 도라지 재배지 32개 농가의 토양 물리적 성질을 조사하고 근경부패병 발병 및 수량에 미치는 영향을 조사한 결과는 다음과 같다. 발병율과 유효토심은 Y = -0.747X + 88.19($R^2=0.394^{***}$), 토양경도는 Y = 4.36X + 8.93($R^2=0.201^*$), 용적밀도는 Y = 104.7X - 80.99($R^2=0.295^{**}$), 점토함량과는 Y = 1.24X + 14.14($R^2=0.196^*$), 토양공극과 Y= -3.l1X + 215.9($R^2=0.220^*$), 미사함량과는 Y = -0.75X + 67.85($R^2=0.178^*$)의 상관을 나타냈다. 수량은 토심과 Y = 0.263X + 0.971($R^2=0.105^*$), 경도는 Y = -1.712X + 30.60($R^2=0.109^*$), 자갈함량은 Y= -0.9172X + 45.74($R^2=0.113^*$), 점토함량은 Y = -0.688X+32.74($R^2=0.158^*$), 공극률은 Y = 1.974X -93.19($R^2=0.231^*$), 미사함량 Y = 53.05X - 108.65($R^2=0.232^{**}$)의 상관이 있었다. 위의 결과 다년생 도라지 재배적지는 유효토심 1m 이상, 토양경도는 $5kg\;cm^{-2}$ 이하, 용적밀도는 $1.0Mg\;m^{-3}$ 정도, 공극율은 58~63%, 수분함량은 13~17%, 점토함량은 5~10%, 미사함량은 38~64%가 좋은 것으로 나타났으며 토성은 미사질양토가 가장 좋은 것으로 분석되었다.
부상필(Boo, Sangpil),문경태(Moon, Kyoungtae),박상렬(Park, Sangyeol) 대한토목학회 2020 대한토목학회 학술대회 Vol.2020 No.10
제주도에는 화산활동에 의해 형성된 용암동굴이 지하 곳곳에 분포하고 있다. 본 사례에서는 도로공사 중 발견된 용암동굴의 보존을 위해 문화재청의 진동기준을 만족하도록, 공사중 장비사용에 의한 진동을 측정하였다. 공사완료 후 차량하중에 의한 동굴의 안정성을 평가하기 위하여 토공(성토) 시공시 및 교량 적용시에 대한 동적해석을 실시하여 진동치를 예측하였다. 본 사례를 통하여 향후 동굴이 발견되는 경우에 동굴의 안정성과 경제적인 공법을 적용할 수 있는 기초자료로 제공하고자 한다.
무름병균 Erwinia chrysanthemi PY35 의 CMCase isozymes 분리
박상렬,윤한대,조수정 한국농화학회 1999 Applied Biological Chemistry (Appl Biol Chem) Vol.42 No.3
Soft-rot bacterial pathogen, Erwinia sp., was isolated from Chinese cabbage tissue showing soft-rot symptom. This bacterial strain caused soft-rot to Chinese cabbage and potato, and identified as Erwinia chrysanthemi PY35(Ech PY35). Ech PY35 have extracellular CMCase, pectinase, pectate lyase, and protease activity, but not hemicellulase activity. The results of the microscopy showed that Chinese cabbage tissue and potato tissue were macerated by infection of Ech PY35. In analysis of the CMCases activity in the total protein of Ech PY35, three CMCases were detected as intracellular protein while two CMCases were as extracellular protein by CMC-SDS-PAGE direct stain method.
토양 화학성과 미생물상이 도라지 근경부패병에 미치는 영향
김종균,박상렬,윤한대,조수정,이영한,최용조 한국환경농학회 2000 한국환경농학회지 Vol.19 No.1
도라지 재배지의 토양 화학성과 미생물상을 진주 6, 김해 7, 고성 3, 함안 6, 거창 4개소, 강원도 홍천 6개소 등 32개소를 대상으로 97년부터 98년까지 조사한 결과는 다음과 같다. 발병율은 함안, 홍천지역이 각각 56.8, 52.5%로 높게 나타났고 고성, 진주지역이 30.0, 32.2%로 낮게 나타났다. 정상근과 장해근 표토의 K, EC 및 NH₄-N 함량은 장해토양이 정상토양 보다 높고 Mn함량은 낮게 나타나 유의성이 인정되었다. 뿌리의 CaO함량과 수량과는 Y=20505X-367.9(R²=0.129)의 정의상관이 있었고 정상근은 장해근에 비해 Fe, Zn 함량이 높은 반면 T-N, P₂O_5, K₂O 함량은 낮은 경향을 나타내어 과다양분 흡수에 의한 도라지 근의 병발생 조건이 증가된 것으로 판단되었다. 정상재배지의 토양 세균, 방선균 및 세균/사상군 수치는 장해지보다 높은 반면 사상균의 밀도는 낮았다. This study was conducted to determine the soil chemical properties and microbial flora of platycodon and their effect on rhizome rot incidence. Sampling sites were Keochang 4, Kimhae 7, Haman 6, Chinju 6 and Koseong 3 fields in Kyongnam province and Hongcheong 6 fields in Kangwon province. The root disease incidence rate was in the order of Haman 56.8%, Hongcheon 52.5%, Kimhae 36.7%, Koechang 35.3%, Chinju 32.3%, Koseong 30.0%. The yield at the Chinju 36.17 Mg/㏊ was higher than that of Koseong 25.00 Mg/㏊, Kimhae 13.57 Mg/㏊, Koechang 11.75 Mg/㏊, Haman 9.50 Mg/㏊, Hongcheon 5.24 Mg/㏊. The soil K, NH₄-N content and EC value of injury root were higher than those of normal root. The root CaO content was positively correlated with yield Y=20505X-367.9(R²=0.129). The Fe and Zn content of normal root were higher than those of injury root, while the T-N, P₂O_5 and K₂O content of normal root were lower than those of injury root. The population of bacteria, actinomycetes and bacteria/fungi ratio increased in soil of normal root, but that of fungi decreased.