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Sensor-based Technology for Assessing Drought Stress in Two Warm-Season Turfgrasses
Jae-Ho Hur(허재호),J. Bryan Unruh,Laurie E. Trenholm,Joon-Hee Lee(이준희) 한국잡초학회·한국잔디학회 2006 Weed & Turfgrass Science Vol.20 No.2
본 연구는 토양 수분함량을 즉시 파악할 수 있는 Time Domain Radiometer(TDR) 과 식물의 광합성 시 잎에서 반사되는 Reflectance를 통하여 식물의 상태를 파악할 수 있는 Multi-spectral radiometer(MSR)를 사용하여 난지형 잔디인 ‘Sea Isle 1' Seashore paspalum 과 ‘Floratam' St. Augustinegrass를 대상으로 토양수분함량과 Reflectance와의 상관관계를 파악하고자 시작하였다. 본 연구를 통해 토양 수분함량이 660, 694 wavelengths와 NDVI, LAI, stress index에서 높은 상관관계를 가지고 있음을 알 수 있었다. 이는 Sensor-based technology가 잔디의 수분요구 시점을 미리 파악할 수 있는 기술의 기초 자료로서 활용될 수 있으며 여러 다른 Sensor-based technology를 이용한 연구로 확대될 수 있을 것이다. This study was designed to determine what sensor based technologies might reliably and accurately predict irrigation scheduling needs of warm season turfgrass. ‘Floratam’ St. Augustinegrass[Stenotaphrum secundatum(Walt.) Kuntze] and ‘Sea Isle I’ seashore paspalum(Paspalum vaginatum Swartz) were established in tubs in the Envirotron Turfgrass Research Laboratory in Gainesville, FL in the spring of 2002. Each grass was subjected to repeated dry down cycles where irrigation was withheld. Sensor based data were collected and these evaluations were used to determine if irrigation scheduling could be determined based on plant response during dry down. Results indicated that reflectance indices(P≤ 0.001) and soil moisture(P≤ 0.0001) throughout the dry down cycle can predict the need for irrigation scheduling as turf quality declined below acceptable levels.
Sensor-based Technology for Assessing Drought Stress in Two Warm-Season Turfgrasses
이준희,허재호,Lee, Joon-Hee,Trenholm, Laurie E.,Unruh, J. Bryan,Hur, Jae-Ho Turfgrass Society of Korea 2006 한국잔디학회지 Vol.20 No.2
본 연구는 토양 수분함량을 즉시 파악할 수 있는 Time Domain Radiometer(TDR)과 식물의 광합성 시 잎에서 반사되는 Reflectance를 통하여 식물의 상태를 파악할 수 있는 Multi-spectral radiometer(MSR)를 사용하여 난지형 잔디인 'Sea Isle 1' Seashore paspalum 과 'Floratam' St. Augustinegrass를 대상으로 토양수분함량과 Reflectance와의 상관관계를 파악하고자 시작하였다. 본 연구를 통해 토양 수분함량이 660, 694 wavelengths와 NDVI, LAI, stress index에서 높은 상관관계를 가지고 있음을 알 수 있었다. 이는 Sensor-based technology가 잔디의 수분요구 시점을 미리 파악할 수 있는 기술의 기초 자료로서 활용될 수 있으며 여러 다른 Sensor-based technology를 이용한 연구로 확대될 수 있을 것이다. This study was designed to determine what sensor-based technologies might reliably and accurately predict irrigation scheduling needs of warm-season turfgrass. 'Floratam' St. Augustinegrass[Stenotaphrum secundatum(Walt.) Kuntze] and 'Sea Isle I' seashore paspalum(Paspalum vaginatum Swartz) were established in tubs in the Envirotron Turfgrass Research Laboratory in Gainesville, FL in the spring of 2002. Each grass was subjected to repeated dry-down cycles where irrigation was withheld. Sensor-based data were collected and these evaluations were used to determine if irrigation scheduling could be determined based on plant response during dry-down. Results indicated that reflectance indices($P{\le}0.001$) and soil moisture($P{\le}0.0001$) throughout the dry-down cycle can predict the need for irrigation scheduling as turf quality declined below acceptable levels.
전력계통 보호기기에 적용한 One-coil 전자식 조작기(PMA)의 동작특성 개선
김승진(Seung-Jin Kim),허재호(Jae-Ho Hur),김태현(Tae-Hyun Kim),김영일(Young-Il Kim),정호성(Hosung Jung) 대한전기학회 2021 전기학회논문지 Vol.70 No.12
This paper proposes an enhanced operating characteristic of One-coil Permanent Magnetic Actuators (PMA) applied to protection devices in power systems such as circuit breakers and switches. A Finite Element Method(FEM) was used to design the PMA. A short circuit switching test was performed with a recloser in which a prototype PMA was applied and an additional test was conducted after improving the recloser based on the analysis derived from the previous short circuit switching test. From the test result, data on the operating characteristics according to the weight of the mover and the design of the opening spring was obtained. The resulting data obtained will be helpful in designing a future power system protection device to which a One-coil PMA is applied.