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Clinkering of Sewage Sludge Ash as Cement Raw Material
Ahn, Ji-Whan,You, Kwang-Suk,Cheon, Sung-Min,Han, Ki-Suk,Kim, Hwan The Korean Ceramic Society 2004 한국세라믹학회지 Vol.41 No.4
본 연구는 석회석, 셰일, 전로슬래그, 플라이 애쉬를 사용한 혼합원료에 대해 보통 포틀랜드 시멘트 원료로서 하수슬러지 소각재의 사용에 대해 조사하였다. 이와 관련하여 원료 중 셰일에 대한 하수슬러지의 적정 치환 비율을 확인하였으며, 1,300, 1,350, 1,400, 1,450, 1,50$0^{\circ}C$에서 1시간 혼합원료를 소성하였다. 이후 공기중 급냉을 시행하였으며, XRD, SEM을 통하여 합성된 클링커의 특성을 평가하였다. 또한, 클링커의 미반응 산화칼슘을 측정하여 소성성에 대한 결과를 얻었다. This study has been carried out to use the municipal solid waste sewage sludge ash generated at sewage disposal field as the raw materials of Ordinary Portland Cement (OPC). Limestone, shale, converter slag, and fly ash were used as the main raw materials. After the raw materials were mixed, these were fired at 1,300, 1,350, 1,400, 1,450, and 1,500$^{\circ}C$ for 1 h and cooled rapidly in air. The properties of clinker synthesized were examined with XRD, SEM, and burnability index by polysius method.
A Study on optimal tuning method of hybrid Controller
Sung-kwun Oh,Tae-chon Ahn,Kwang-bang Woo 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
In the paper, an optimal tuning algorithm is presented to automatically improve the performance of a hybrid controller, using the simplified reasoning method and the proposed complex method. The method estimates automatically the optimal values of the parameters of a hybrid controller, according to the change rate and limitation condition of output. The controller is applied to plants with time-delay. Then, computer simulations are conducted at step input and the performances are evaluated in the ITAE.
( Sung Soo Ahn ),( Young Eun Chon ),( Beom Kyung Kim ),( Seung Up Kim ),( Do Young Kim ),( Sang Hoon Ahn ),( Kwang Hyub Han ),( Jun Yong Park ) 대한간학회 2014 Clinical and Molecular Hepatology(대한간학회지) Vol.20 No.3
Background/Aims: This study assessed the antiviral efficacy and safety of tenofovir disoproxil fumarate (TDF) for up to 12 months in Korean treatment-naive chronic hepatitis B (CHB) patients. Methods: A total of 411 treatment-naive CHB patients who had been treated with TDF for at least 3 months (median 5.6) were consecutively enrolled. Clinical, biochemical, virological parameters and treatment adherence were routinely assessed every 3 months. Results: The median age was 51.3 years, 63.0% of the patients were male, 49.6% were HBeAg (+), and 210 patients had liver cirrhosis. The median baseline HBV DNA was 5.98 (SD 1.68) log10 IU/mL. Among the patients completing week 48, 83.3% had a complete virologic response (CVR, <12 IU/mL by HBV PCR assay), and 88.2% had normalized levels of alanine aminotransferase (ALT). The cumulative probabilities of CVR at 3, 6, 9 and 12 months were 22.8 %, 53.1%, 69.3% and 85.0%. During the follow-up period, 9.8% patients achieved HBeAg loss and 7.8% patients achieved HBeAg seroconversion. There was no virological breakthrough after initiating TDF. The most common TDF-related adverse event was gastrointestinal upset, and three patients discontinued TDF therapy. However, no serious life-threatening side effect was noted. Conclusions: In a clinical practice setting, TDF was safe and highly effective when administered for 12 months to Korean treatment-naive CHB patients. (Clin Mol Hepatol 2014;20:261-266)