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Lan‑Mei Cong,Xiao‑Cong Li 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.2
Hydraulic generator plays more important roles as a renewable clean energy in improving stability. As hydraulic generator enjoys strong nonlinear properties, traditional linearized control method may holds worse adaptability for vary disturbances. In order to solve the problem, a Nonlinear Equivalent Input Disturbance Coordinated Control (NEIDCC) method is proposed in this paper. The objective functions related to system control performance are frstly determined. Then the multi-objective equations satisfying the Brunovsky normal form are derived, by which the nonlinear control problem is transformed to linear space to be solved. The nonlinear equivalent control law is obtained from the linear law by calculating the Γ derivative of the objective functions. When the system is subjected to diferent disturbances, the designed NEIDCC control law supports dynamic damping by observing the disturbance to stabilize the oscillations. As a result, the control system holds good performance. The simulation results of the designed hydraulic turbine generator control system demonstrate the efectiveness of the NEIDCC method.
유무선 통합 환경에서 효과적인 멀티캐스트 라우팅 알고리즘
원미란,김미혜 충북대학교 컴퓨터정보통신 연구소 2004 컴퓨터정보통신연구 Vol.12 No.1
본 논문은 유무선 통합 환경에서 효과적인 멀티캐스트 라우팅 알고리즘을 제안한다. 제안한 M_AQDMR 알고리즘은 Agent내에 내장된 두 가지 버퍼(Storage_Buffer 및 Provisional_Buffer)를 이용하여 모바일 노드가 이동할 때 패킷의 손실을 방지할 수 있으며, JoinRequest메시지와 JoinAccept메시지를 이용하여 동적으로 멀티캐스트 트리 구조를 조절할 수 있다. 시뮬레이션 결과, 새로운 M_AQDMR 알고리즘은 네트워크 비용, 패킷 손실률 등의 측면에서 기존의 QDMR 알고리즘에 비해 효율적임을 알 수 있었다. In this paper, we propose an efficient multicast routing algorithm on the wire/wireless integrated environment. This proposed M_AQDMR algorithm can prevent loss of packet when mobile node moves by using two internal buffers(storage_buffer and provisional_buffer), and dynamically control multicast tree by using JoinRequest message and JoinAccept message. The result of simulations showed that this new M_AQDMR algorithm is more efficient than the existing QDMR algorithms in the case of network cost and loss of packet
Bioelectrical Impedance May Predict Cell Viability During Ischemia and Reperfusion in Rat Liver
Mei Lan Cui,안현수,김종연,신현진,이동식,김홍진,윤성수 대한의학회 2010 Journal of Korean medical science Vol.25 No.4
Ischemia and reperfusion (I/R) injury is a major cause of hepatic failure after liver surgery, but no method could monitor or predict it real-time during surgery. We measured bioelectrical impedance (BEI) and cell viability to assess the usefulness of BEI during I/R in rat liver. A 70% partial liver ischemia model was used. BEI was measured at various frequencies. Adenosine triphosphate (ATP) content, and palmitic acid oxidation rate were measured, and histological changes were observed in order to quantify liver cell viability. BEI changed significantly during ischemia at low frequency. In the ischemia group, BEI increased gradually during 60 min of ischemia and had a tendency to plateau thereafter. The ATP content decreased below 20% of the baseline level. In the I/R group, BEI recovered to near baseline level. After 24 hr of reperfusion, the ATP contents decreased to below 50% in 30,60 and 120 min of ischemia and the palmitic acid metabolic rates decreased to 91%, 78%, and 74%, respectively, compared with normal liver. BEI may be a good tool for monitoring I/R during liver surgery. The liver is relatively tolerant to ischemia,however after reperfusion, liver cells may be damaged depending upon the duration of ischemia.
( Mei Lan Zhang ),( Man Liu ) 서강대학교 언어정보연구소 2014 언어와 정보 사회 Vol.22 No.-
Language & Information Society 22. Qingwen Zhiyao(100 chapters) of several editions during its spread, had significant influence on foreigners’ compiling Chinese textbooks, with many different adaptations as a result. This paper reveals some features of spoken words of Northern Chinese in the end of Qing dynasty based on the textual differences of seven adaptations of Qingwen Zhiyao during several decades.
2015년 인삼재배지에서의 인삼뿌리썩음병원균의 분리동정 및 토양밀도검정
Mei Lan Jin,Kyeon Hun Park,Sung Woo Lee,Dong Yun Hyun,Seung Ho Lee 한국약용작물학회 2016 한국약용작물학술대회 발표집 Vol.2016 No.10
Background : Ginseng (Panax ginseng C.A. Meyer) is one of the most important medicinal plants in Korea, but its yields are often reduced by a variety of root pathogens. The root rot of ginseng is a destructive soil-borne disease caused by Cylindrocarpon destructans (teleomorph: Ilyonectria radicicola). To monitor contamination with C. destructans in ginseng harvested in 2015 were sampled from 57 different growing fields. The spore number of C. destructans was quantified by use of a specific primers and selective media (radicicol) in soils of ginseng fields. Methods and Results : The ginseng samples were surface-sterilized and placed on potato dextrose agar plates for 7 day incubation at 20℃. Emerging fungal colonies were counted primarily based on colony and conidia morphology. Further species level identification was confirmed by ITS rDNA sequencing. For quantification of the soil-borne C. destructans, the genomic DNA was extracted from the soil using a NucleoSpin soil kit (MN, Germany). Density of C. destructans was determined by species specific real time PCR (qPCR). The qPCR was completed by running a melting curve analysis. Conclusion : The C. destructans associated with root rot disease of ginseng were detected in more than 60% in pyeongtaek-1, pochenon-1, jecheon-1, chungju-1 and jinan-4. As results of the study, the correlation between pathogen density and identification clearly clarified in the soil.