This paper analyses the performance of the ATM switch fabric with Combined-Input/ Output Buffering(C-IOB) under two different service principles for the cells at the head of line (HOL) positions of input buffers: Firs...This paper analyses the performance of the ATM switch fabric with Combined-Input/ Output Buffering(C-IOB) under two different service principles for the cells at the head of line (HOL) positions of input buffers: First Come First Service (FCFS)/Random Service(RS) for the set of HOL cells addressed to a given output port with different/same "age" (the waiting time at the HOL position) and Pure Random Service(PRS) for all HOL cells addressed to a given output port regardless of their "ages" while the Queue Loss (QL) transfer scheme is adopted for interaction between input and output buffers in the ATM switch fabric. The results obtained show that the C-IOB ATM switch fabric with PRS service policy and the QL transfer scheme is better than other buffering ATM switch fabrics.展开更多
We consider quadratic stabilization for a class of switched systems which are composed of a finite set of continuoustime linear subsystems with norm bounded uncertainties. Under the assumption that there is no single ...We consider quadratic stabilization for a class of switched systems which are composed of a finite set of continuoustime linear subsystems with norm bounded uncertainties. Under the assumption that there is no single quadratically stable subsystem, if a convex combination of subsystems is quadratically stable, then we propose a state-dependent switching law, based on the convex combination of subsystems, such that the entire switched linear system is quadratically stable. When the state information is not available, we extend the discussion to designing an outputdependent switching law by constructing a robust Luenberger observer for each subsystem.展开更多
Purpose: Fixed-combination medication to treat glaucoma can reduce intraocular pressure (IOP) without negative effects of concomitant medication. Tafluprost/timolol fixed-combination ophthalmic solution (TTFC) has bee...Purpose: Fixed-combination medication to treat glaucoma can reduce intraocular pressure (IOP) without negative effects of concomitant medication. Tafluprost/timolol fixed-combination ophthalmic solution (TTFC) has been reported to show similar effectiveness in lowering IOP, compared with concomitant use of its component drugs, tafluprost and timolol. However, the difference in IOP-lowering effects between TTFC and concomitant use of tafluprost and gel-forming timolol is unknown. Hence, we conducted this switching study from tafluprost and gel-forming timolol to TTFC in glaucoma patients undergoing multi-drug therapy. Design: Multi-center, open-label, interventional clinical study. Methods: Twenty-eight patients (28 eyes;safety analysis set) with primary open-angle glaucoma and ocular hypertension, who had completed the 4-week-concomitant phase of tafluprost and gel-forming timolol, were treated for 8 weeks with TTFC. IOP, adherence, ocular surface safety, and the usability of ophthalmic solution were compared before and after switching. This study was approved by the ethics committees of Kitasato University Hospital and all other study sites. All patients provided written informed consent to participate. Results: IOP at 8 weeks after switching was significantly lower than before switching (P = 0.0001) in the efficacy analysis set (n = 24). The self-reported adherence rate remained high after switching;moreover, there was no meaningful change in ocular surface safety. Patient questionnaires regarding usability of medication revealed that 85.7% of patients preferred their instillation prescription after switching, including TTFC. Among the safety analysis set (n = 28), no adverse events were reported in relation to the study drug. Conclusion: TTFC showed greater IOP reduction than concomitant therapy. Thus, TTFC may be a better option in glaucoma patients than concomitant therapy.展开更多
The robust control problem for a class of uncertain switched fuzzy systems with delays is investigated. Firstly,the model of the switched fuzzy system is presented and the parallel distributed compensation( PDC) techn...The robust control problem for a class of uncertain switched fuzzy systems with delays is investigated. Firstly,the model of the switched fuzzy system is presented and the parallel distributed compensation( PDC) technology is employed to design fuzzy controllers. Then, based on the convex combination method, a sufficient condition for robust stabilization in terms of linear matrix inequalities( LMIs) is obtained and a switching law is presented.Meanwhile,the Lyapunov-Krasovskii functional is taken to deal with time varying delays. Moreover,an algorithm is applied to finding a solution for a group of convex combination coefficient. Finally,a numerical example is given to demonstrate the effectiveness of the proposed method.展开更多
±1 100 k V直流U型结构穿墙套管具有机械性能好、便于安装等优点,但U型结构穿墙套管端部均压环对墙体距离与对地距离相近,在设计中需要考虑这两类间隙的综合绝缘问题。因此,为保证±1 100 k V U型穿墙套管运行中的外绝缘安全,...±1 100 k V直流U型结构穿墙套管具有机械性能好、便于安装等优点,但U型结构穿墙套管端部均压环对墙体距离与对地距离相近,在设计中需要考虑这两类间隙的综合绝缘问题。因此,为保证±1 100 k V U型穿墙套管运行中的外绝缘安全,并系统掌握其电气间隙放电特性,采用均压环和钢架试品模拟±1 100 k V直流U型结构穿墙套管端部均压环对墙和对地电气绝缘间隙,开展了环对墙不同间隙距离、不同对地高度以及典型配置综合间隙操作冲击放电特性试验研究,获得了模拟±1 100 k V U型穿墙套管电气间隙的操作冲击放电特性参数,并结合系统操作过电压水平提出了±1 100 k V直流U型结构穿墙套管最小安全间隙推荐值,在海拔0、500、1 000 m的条件下,最小安全间隙配置取为12.1 m/12.4 m、12.6 m/12.9 m和12.8 m/13.1 m(均压环对阀厅墙体/对地)。展开更多
文摘This paper analyses the performance of the ATM switch fabric with Combined-Input/ Output Buffering(C-IOB) under two different service principles for the cells at the head of line (HOL) positions of input buffers: First Come First Service (FCFS)/Random Service(RS) for the set of HOL cells addressed to a given output port with different/same "age" (the waiting time at the HOL position) and Pure Random Service(PRS) for all HOL cells addressed to a given output port regardless of their "ages" while the Queue Loss (QL) transfer scheme is adopted for interaction between input and output buffers in the ATM switch fabric. The results obtained show that the C-IOB ATM switch fabric with PRS service policy and the QL transfer scheme is better than other buffering ATM switch fabrics.
基金supported in part by the Japan Ministry of Education,Sciences and Culture under Grants-in-Aid for Scientific Research(C)(21560471)the Green Industry Leading Program of Hubei University of Technology(CPYF2017003)the National Natural Science Foundation of China(1160147411461082)
文摘We consider quadratic stabilization for a class of switched systems which are composed of a finite set of continuoustime linear subsystems with norm bounded uncertainties. Under the assumption that there is no single quadratically stable subsystem, if a convex combination of subsystems is quadratically stable, then we propose a state-dependent switching law, based on the convex combination of subsystems, such that the entire switched linear system is quadratically stable. When the state information is not available, we extend the discussion to designing an outputdependent switching law by constructing a robust Luenberger observer for each subsystem.
文摘Purpose: Fixed-combination medication to treat glaucoma can reduce intraocular pressure (IOP) without negative effects of concomitant medication. Tafluprost/timolol fixed-combination ophthalmic solution (TTFC) has been reported to show similar effectiveness in lowering IOP, compared with concomitant use of its component drugs, tafluprost and timolol. However, the difference in IOP-lowering effects between TTFC and concomitant use of tafluprost and gel-forming timolol is unknown. Hence, we conducted this switching study from tafluprost and gel-forming timolol to TTFC in glaucoma patients undergoing multi-drug therapy. Design: Multi-center, open-label, interventional clinical study. Methods: Twenty-eight patients (28 eyes;safety analysis set) with primary open-angle glaucoma and ocular hypertension, who had completed the 4-week-concomitant phase of tafluprost and gel-forming timolol, were treated for 8 weeks with TTFC. IOP, adherence, ocular surface safety, and the usability of ophthalmic solution were compared before and after switching. This study was approved by the ethics committees of Kitasato University Hospital and all other study sites. All patients provided written informed consent to participate. Results: IOP at 8 weeks after switching was significantly lower than before switching (P = 0.0001) in the efficacy analysis set (n = 24). The self-reported adherence rate remained high after switching;moreover, there was no meaningful change in ocular surface safety. Patient questionnaires regarding usability of medication revealed that 85.7% of patients preferred their instillation prescription after switching, including TTFC. Among the safety analysis set (n = 28), no adverse events were reported in relation to the study drug. Conclusion: TTFC showed greater IOP reduction than concomitant therapy. Thus, TTFC may be a better option in glaucoma patients than concomitant therapy.
基金National Natural Science Foundation of China(No.51375228)Natural Science Foundation of Jiangsu Province,China(No.BK20130791)
文摘The robust control problem for a class of uncertain switched fuzzy systems with delays is investigated. Firstly,the model of the switched fuzzy system is presented and the parallel distributed compensation( PDC) technology is employed to design fuzzy controllers. Then, based on the convex combination method, a sufficient condition for robust stabilization in terms of linear matrix inequalities( LMIs) is obtained and a switching law is presented.Meanwhile,the Lyapunov-Krasovskii functional is taken to deal with time varying delays. Moreover,an algorithm is applied to finding a solution for a group of convex combination coefficient. Finally,a numerical example is given to demonstrate the effectiveness of the proposed method.
文摘±1 100 k V直流U型结构穿墙套管具有机械性能好、便于安装等优点,但U型结构穿墙套管端部均压环对墙体距离与对地距离相近,在设计中需要考虑这两类间隙的综合绝缘问题。因此,为保证±1 100 k V U型穿墙套管运行中的外绝缘安全,并系统掌握其电气间隙放电特性,采用均压环和钢架试品模拟±1 100 k V直流U型结构穿墙套管端部均压环对墙和对地电气绝缘间隙,开展了环对墙不同间隙距离、不同对地高度以及典型配置综合间隙操作冲击放电特性试验研究,获得了模拟±1 100 k V U型穿墙套管电气间隙的操作冲击放电特性参数,并结合系统操作过电压水平提出了±1 100 k V直流U型结构穿墙套管最小安全间隙推荐值,在海拔0、500、1 000 m的条件下,最小安全间隙配置取为12.1 m/12.4 m、12.6 m/12.9 m和12.8 m/13.1 m(均压环对阀厅墙体/对地)。
