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A Review of Steam Generation for In-Situ Oil Sands Projects
곽관웅,배위섭 한국자원공학회 2010 Geosystem engineering Vol.13 No.3
Steam Assisted Gravity Drainage (SAGD), an unconventional enhanced oil recovery process for the oil sands, is getting more attention recently as the international oil price increases rapidly. Basic concept of SAGD is to extract the viscosity-lowered bitumen by high pressure, high temperature 100% quality steam injected into the reservoir containing high-viscosity bitumen. As its name implies, generation of highquality,high-temperature and high-pressure steam is a prerequisite for the SAGD process. Hence in this paper, key aspects of steam generation system for oil sands recovery will be broadly reviewed to provide the engineers concerned with the working principles and the major issues such as configuration, design,control of steam generation system used for oil sands recovery.
Control system design for the mock ventricle with aortic and mitral valve resistance uncertainty
곽관웅,김창완,전용태,홍성경 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.9
Reproducing the native left ventricle’s contractile behavior is the key ingredient for the mock cardiovascular circulatory system. It canbe achieved by controlling either mock ventricle's pressure or volume so that it could follow the reference signal calculated by the Elastancewaveform. However, due to inherent uncertainties of the parameter values of the mock ventricle, such as check valve resistance, itis difficult to achieve high quality control performance. In this paper, we present an adaptive control scheme to overcome this parametervalue uncertainty and to achieve high quality control performance. To the best knowledge of the author, it is the first report that reproducesthe mock ventricle pumping dynamics precisely considering the resistance of the aortic/mitral check valves and overcoming theuncertainty of them. In the paper, along with the detailed design of the controller, rigorous proof of the stability and the convergence ispresented as well. Computer simulation was performed using an electrical-analog cardiovascular circulatory system model and a pistonpump mock ventricle model. Results confirmed that adaptive control achieved almost perfect tracking performance in spite of large parameteruncertainty and high bandwidth dynamic characteristics of the mock ventricle. Performance comparison verified the superiorityof the adaptive controller over PID controllers.