Energy management strategies based on optimal control theory can achieve minimum fuel consumption for hybrid electric vehicles, but the requirement for driving cycles known in prior leads to a real-time problem. A rea...Energy management strategies based on optimal control theory can achieve minimum fuel consumption for hybrid electric vehicles, but the requirement for driving cycles known in prior leads to a real-time problem. A real-time optimization power-split strategy is proposed based on linear quadratic optimal control. The battery state of charge sustainability and fuel economy are ensured by designing a quadratic performance index combined with two rules. The engine power and motor power of this strategy are calculated in real-time based on current system state and command, and not related to future driving conditions. The simulation results in ADVISOR demonstrate that, under the conditions of various driving cycles, road slopes and vehicle parameters, the proposed strategy significantly improves fuel economy, which is very close to that of the optimal control based on Pontryagin's minimum principle, and greatly reduces computation complexity.展开更多
Objective： To report a case ser/es of six neglected cervical spine dislocations without neurological deficit, which were managed operatively. Methods： The study was conducted fromAugust 2010 to December 2011 and ca...Objective： To report a case ser/es of six neglected cervical spine dislocations without neurological deficit, which were managed operatively. Methods： The study was conducted fromAugust 2010 to December 2011 and cases were selected from the out- patient department of Postgraduate Institute of Medical Education and Research, India. The patients were in the age group of 30 to 50 years. All patients were operated via both anterior and posterior approaches. Results： During the immediate postoperative period, five （83.33%） patients had normal neurological status. One （16.67%） patient who had C5-C6 subluxation developed neu- rological deficit with sensory loss below C6 level and motor power of 2/5 in the lower limb and 3/5 in the upper limb below C6 level. Conclusion： There is no role of skull traction in ne- glected distractive flexion injuries to cervical spine delayed for more than 3 weeks. Posterior followed by anterior ap- proach saves much time. If both approaches are to be done in the same sitting, there is no need for instrumentation posteriorly. But if staged procedure is planed, posterior sta- bilization is recommended, as there is a risk of deterioration in neurological status.展开更多
文摘Energy management strategies based on optimal control theory can achieve minimum fuel consumption for hybrid electric vehicles, but the requirement for driving cycles known in prior leads to a real-time problem. A real-time optimization power-split strategy is proposed based on linear quadratic optimal control. The battery state of charge sustainability and fuel economy are ensured by designing a quadratic performance index combined with two rules. The engine power and motor power of this strategy are calculated in real-time based on current system state and command, and not related to future driving conditions. The simulation results in ADVISOR demonstrate that, under the conditions of various driving cycles, road slopes and vehicle parameters, the proposed strategy significantly improves fuel economy, which is very close to that of the optimal control based on Pontryagin's minimum principle, and greatly reduces computation complexity.
文摘Objective： To report a case ser/es of six neglected cervical spine dislocations without neurological deficit, which were managed operatively. Methods： The study was conducted fromAugust 2010 to December 2011 and cases were selected from the out- patient department of Postgraduate Institute of Medical Education and Research, India. The patients were in the age group of 30 to 50 years. All patients were operated via both anterior and posterior approaches. Results： During the immediate postoperative period, five （83.33%） patients had normal neurological status. One （16.67%） patient who had C5-C6 subluxation developed neu- rological deficit with sensory loss below C6 level and motor power of 2/5 in the lower limb and 3/5 in the upper limb below C6 level. Conclusion： There is no role of skull traction in ne- glected distractive flexion injuries to cervical spine delayed for more than 3 weeks. Posterior followed by anterior ap- proach saves much time. If both approaches are to be done in the same sitting, there is no need for instrumentation posteriorly. But if staged procedure is planed, posterior sta- bilization is recommended, as there is a risk of deterioration in neurological status.
