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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
Impaired Cation Transport May Lead to Bioelectrical Impedance Changes during Hepatic Ischemia
Mei Lan Cui,Hyun Soo Ahn,Jong Yeon Kim,Dong Shik Lee,Hong Jin Kim,Sung Su Yun 대한외과학회 2010 Annals of Surgical Treatment and Research(ASRT) Vol.78 No.6
Purpose: Ischemia and reperfusion (I/R) injury is a major cause of hepatic failure after liver surgery, but there is no direct method to monitor it in real-time (like an electrocardiogram in heart disease) during surgery. Recently we found the possible role of bioelectrical impedance (BEI) to monitor I/R injury in liver. But the mechanism responsible for ischemia-related BEI changes has not been clearly determined. Methods: The authors used an LCR meter to quantify BEI changes at 0.12 ㎑. Livers were subjected to 70% partial ischemia for 120 minutes, and ATP contents, cation changes in extracellular fluid (ECF; determined using an in vivo intracellular microdialysis technique), hepatocyte sizes, and histological changes were then examined. Results: Liver tissue BEI was found to increase gradually during the first 60 minutes of ischemia and then tended to plateau. During the same period, intracellular ATP contents decreased to below 20% of the baseline level, [Na?] in ECF decreased from 150.4±3.8 to 97.8±10.6 mmol/L, and [K?] in ECF increased from 7.5±0.3 to 34.3±5.5 mmol/L during the first 60 minutes of ischemia. Hepatocyte diameter increased by ∼20% during the first 60 minutes of ischemia. Conclusion: This study suggests that BEI changes during hepatic ischemia are probably caused by sodium and potassium concentration changes in the ECF due to reduced intracellular ATP contents.
Phase Contrast Projection Display Using Photopolymer
Mei-Lan Piao,김남,박재형 한국광학회 2008 Current Optics and Photonics Vol.12 No.4
We propose a phase contrast filter using photopolymer, for the phase contrast projection display. The photopolymer has high photosensitivity such that its optically induced refractive index change has a linear dependency on the illuminating light intensity. We implemented a phase contrast projection display using photopolymer as a phase contrast filter. By controlling the refractive index change of the photopolymer, we successfully convert an input phase image into a high contrast intensity image. We also investigated the effect of the photopolymer illumination condition on the quality of the displayed intensity image. As a projector, we achieved 82% phase to intensity conversion efficiency, which implies that the proposed method can potentially have much higher light efficiency than conventional projection display.