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Estimation and Measurement of Forward Propagated Ultrasonic Fields in Layered Fluid Media
Ha, Kang-Lyeol,Kim, Moo-Joon,Hyun, Byung-Gook The Acoustical Society of Korea 2000 韓國音響學會誌 Vol.19 No.e2
The forward propagated ultrasonic fields resulting from a circular plane or a concave transducer in layered fluid media as well as in homogeneous water are theoretically estimated by the angular spectrum method(ASMJ) combined with Rayleigh-Sommerfeld diffraction theory(RSDT), and measured by a precision 3-D scanning system with a needle-point hydrophone. To make the aliasing error negligible on the 2-D FFT in the theoretical estimation, the spatial discretization in the ASM are carefully considered for optimal selection of spatial sampling intervals and the size of discretization area. It is shown that the estimated fields agree reasonably with the measured ones.
Effects of Mechanical Milling on the Carbothermal Reduction of Oxide of WC/Co Hardmetal Scrap
이길근,Gook-Hyun Ha 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.2
The effects of mechanical milling on the carbothermal reduction of oxidized WC/Co hardmetal scrap with solid carbon were examined. Mixed powders were manufactured by milling the WC/Co hard metal scrap oxide and carbon powder in either a tumbler-ball mill or a planetary-ball mill. The milling type affected the carbothermal reduction of the oxide owing to the differing collision energies (mechanical milling energies) in the mills. The hardmetal scrap oxide powder (WO3, CoWO4) milled at high energy was more greatly reduced and at a lower temperature than that milled at lower mechanical energy. The formation of WC by the carburization reaction with solid carbon reached completion at a lower temperature after higher-energy milling than after lower-energy milling. The WC/Co composite particles synthesized by the combined oxidationmechanical milling-carbothermal reduction process were smaller when the initial powder was milled at higher mechanical energy.
정현철,이우철,김태오,이창원,류수형,이수봉,곽임수,나하연,송상헌,이현국 대한내과학회 1999 대한내과학회지 Vol.56 No.3
Acute focal bacterial nephritis is a part of urinary tract infection and a special form of acute pyelonephritis. In most cases, it is treated well by antimicrobial therapy without severe complications. Unusual cases have been reported that renal failure and or chronic granulomatous interstitial nephritis was combined with acute focal bacterial nephritis. We describe a case of acute reanl failure complicated by acute focal bacterial nephritis in 30-year-old male. He was admitted to this hospital owing to fever, chilling, right flank pain. On admission, BUN and creatinine were 29 mg/dl, 1.8 mg/dl. Urinalysis showed leukocyturia, & bactriuria. Urine culture revealed E. coli over us. Abdominal CT and ultrasonography was represented focal hypodense area and diffuse renal enlargement so we could diagnose acute focal bacterial nephritis. The patient was improved with antimicrobial therapy and hydration. In conclusion, this case shows the possibility that unusual complication such as acute reanl failure can be happensed in acute focal bacterial nephritis in continum with acute pyelonephritis
이승하 ( Seung-ha Lee ),나흥식 ( Hong-sik Na ),정인호 ( In-ho Jung ),엄재용 ( Jae-yong Eom ),김용국 ( Yong-gook Kim ),이정수 ( Jeong-su Lee ),김경영 ( Kyoung-young Kim ),한광현 ( Pros Khok ),심재흥 ( Gwang-hyun Han ),( Jae-hong 한국환경농학회 2020 한국환경농학회 학술대회집 Vol.2020 No.-
본 연구는 음식물류폐기물 혼합 퇴비(Food Waste Compost, FWC)의 시용량에 따라 시설상추의 수량에 어떠한 영향을 미치는지를 구명하기 위해 진행하였다. 비료의 처리는 시설상주 표준시비량을 기준으로 하여 무기질비료 50%에 음식물폐기물류 함유 퇴비를 질소 기준으로 100%,200%, 300% 처리하였고,대조구는 무처리구, 무기질 비료 50%, 무기질 비료 1W%를 처리하였다. 생육초기 음식물류폐기물 혼합 퇴비에 따른 비해는 발생하지 않았다. 수량조사는 일주일 간격으로 총 4회 실시하였고 주당 생체중과 건물중을 측정하였다. 수량조사 결과 음식물류폐기물 혼합 퇴비 FWC1, FWC2 처리구에서 무기질 비료 50%, 100% 처리한 처리구보다 생체중과 건물중이 높게 나타났고 FWC2 처리구에서 가장 높은 수량을 나타냈다. 음식물류폐기물 혼합 퇴비 처리구에서는 처리량이 100%,200% 처리까지는 수량이 증가하나, 300%에서는 오히려 수량이 낮아지는 것으로 나타났다. 본시험에서는 무기질비료 100% 처리구가 50% 처리구보다 수량이 낮게 나타났는데 이는 시설재배지에 토양 EC가 높은 수준이었고 이로 인해 상대적으로 무기질 비료 사용량이 높은 100% 처리구에서 생육이 저조했던 것으로 판단된다.