Stability of a networked predictive control system subject to network-induced delay and data dropout is investigated in this study. By modeling the closed-loop system as a switched system with an upper-triangular stru...Stability of a networked predictive control system subject to network-induced delay and data dropout is investigated in this study. By modeling the closed-loop system as a switched system with an upper-triangular structure, a necessary and sufficient stability criterion is developed. From the criterion, it also can be seen that separation principle holds for networked predictive control systems. A numerical example is provided to confirm the validity and effectiveness of the obtained results.展开更多
Objective：To report surgical management and favorable outcome in a case with delayed repair of traumatic laser in situ keratomileusis（LASIK）flap dislocation with shrinkage and folds.Methods：A 30-year-old man with ...Objective：To report surgical management and favorable outcome in a case with delayed repair of traumatic laser in situ keratomileusis（LASIK）flap dislocation with shrinkage and folds.Methods：A 30-year-old man with a five-year history of bilateral LASIK experienced blunt trauma to his right eye followed by decreased vision for 5 weeks.The surgical management included initially softening the flap by irrigation with balanced salt solution（BSS）.The shrinkage folds were carefully and gently stretched by scraping with a 26-gauge cannula accompanied by BSS irrigation.All of the epithelial ingrowth on the flap inner surface and on the bed was thoroughly debrided by scraping and irrigation.After the flap was repositioned to match its original margin,a soft bandage contact lens was placed.Results：At his initial visit,slit-lamp microscopy and optical coherence tomography（OCT）showed shrinkage of the LASIK flap with an elevated margin approximately 3 mm above the original position.The flap covered half of the pupil and had multiple horizontal folds.Two months after surgery,the flap remained well positioned with only faint streaks in the anterior stroma.The uncorrected visual acuity of the right eye was 20/20 with a manifest refraction of Plano.Conclusions：For delayed repair of traumatically dislocated LASIK flaps,sufficient softening by BSS,stretching the shrinkage folds,and thorough debridement of ingrowth epithelium enable resetting the flap and provide satisfactory results.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.6110409761321002+3 种基金61120106010&61522303)the Research Fund for the Doctoral Program of Higher Education of China(Grant No.20111101120027)the Program for New Century Excellent Talents in University(Grant No.NCET-13-0045)Beijing Higher Education Young Elite Teacher Project
文摘Stability of a networked predictive control system subject to network-induced delay and data dropout is investigated in this study. By modeling the closed-loop system as a switched system with an upper-triangular structure, a necessary and sufficient stability criterion is developed. From the criterion, it also can be seen that separation principle holds for networked predictive control systems. A numerical example is provided to confirm the validity and effectiveness of the obtained results.
基金supported by the Zhejiang Provincial Department of Education(No.Y201533941),China
文摘Objective：To report surgical management and favorable outcome in a case with delayed repair of traumatic laser in situ keratomileusis（LASIK）flap dislocation with shrinkage and folds.Methods：A 30-year-old man with a five-year history of bilateral LASIK experienced blunt trauma to his right eye followed by decreased vision for 5 weeks.The surgical management included initially softening the flap by irrigation with balanced salt solution（BSS）.The shrinkage folds were carefully and gently stretched by scraping with a 26-gauge cannula accompanied by BSS irrigation.All of the epithelial ingrowth on the flap inner surface and on the bed was thoroughly debrided by scraping and irrigation.After the flap was repositioned to match its original margin,a soft bandage contact lens was placed.Results：At his initial visit,slit-lamp microscopy and optical coherence tomography（OCT）showed shrinkage of the LASIK flap with an elevated margin approximately 3 mm above the original position.The flap covered half of the pupil and had multiple horizontal folds.Two months after surgery,the flap remained well positioned with only faint streaks in the anterior stroma.The uncorrected visual acuity of the right eye was 20/20 with a manifest refraction of Plano.Conclusions：For delayed repair of traumatically dislocated LASIK flaps,sufficient softening by BSS,stretching the shrinkage folds,and thorough debridement of ingrowth epithelium enable resetting the flap and provide satisfactory results.
