The evolution of coronary intervention techniques and equipment has led to more sophisticated procedures for the treatment of highly complex lesions.However,as a result,the risk of complications has increased,which ar...The evolution of coronary intervention techniques and equipment has led to more sophisticated procedures for the treatment of highly complex lesions.However,as a result,the risk of complications has increased,which are mostly iatrogenic and often include equipment failure.Stent dislodgement warrants vigilance for the early diagnosis and a stepwise management approach is required to either expand or retrieve the lost stent.In the era of bioresorbable scaffolds that are not radiopaque,increased caution is required.Intravascular imaging may assist in detecting the lost scaffold in cases of no visibility fluoroscopically.Adequate lesion preparation is the key to minimizing the possibility of equipment loss;however,in the case that it occurs,commercially available and improvised devices and techniques may be applied.展开更多
Intermediate charging and sudden failure of automatic guided vehicles(AGVs)interrupt and severely affect the stability and efficiency of scheduling.Therefore,an AGV scheduling approach considering equipment failure an...Intermediate charging and sudden failure of automatic guided vehicles(AGVs)interrupt and severely affect the stability and efficiency of scheduling.Therefore,an AGV scheduling approach considering equipment failure and power management is proposed for outfitting warehouses.First,a power consumption model is established for AGVs performing transportation tasks.The powers for departure and task consumption are used to calculate the AGV charging and return times.Second,an optimization model for AGV scheduling is established to minimize the total transportation time.Different conditions are defined for the overhaul and minor repair of AGVs,and a scheduling strategy for responding to sudden failure is proposed.Finally,an algorithm is developed to solve the optimization model for a case study.The method can be used to plan the charging time and perform rescheduling under sudden failure to improve the robustness and dynamic response capability of AGVs.展开更多
In case of the failure of Automatic Train Control (ATC), it is necessary to organize the train by Telephone Block System. In this paper, the APP system is built on the basis of local area network, which is focus on ...In case of the failure of Automatic Train Control (ATC), it is necessary to organize the train by Telephone Block System. In this paper, the APP system is built on the basis of local area network, which is focus on the simulation station map of Telephone Block System, Wain operation, equipment failure. This APP can vividly simulate the application of Telephone Block System in train urban transit organization.展开更多
In feeder automation transformation there are difficulties in equipment and location selection.To help with this,an optimal layout model of feeder automation equipment oriented to the type of fault detection and local...In feeder automation transformation there are difficulties in equipment and location selection.To help with this,an optimal layout model of feeder automation equipment oriented to the type of fault detection and local action is pro-posed.It analyzes the coordination relationship of the three most common types of automation equipment,i.e.,fault indicator,over-current trip switch and non-voltage trip switch in the fault handling process,and the explicit expres-sions of power outage time caused by a fault on different layouts of the above three types of equipment are given.Given constraints of power supply reliability and the goal of minimizing the sum of equipment-related capital invest-ment and power interruption cost,a mixed-integer quadratic programming model for optimal layout is established,in which the functional failure probability of equipment is linearized using the 3δprinciple in statistics.Finally,the basic characteristics of the proposed model are illustrated by different scenarios on the IEEE RBTS-BUS6 system.It can not only take into account fault location and fault isolation to enhance user power consumption perception,but also can guide precise investment to improve the operational quality and efficiency of a power company.展开更多
Objective: To assess zero drift of intra- ventricular and subdural intracranial pressure (ICP) moni- toring systems. Methods: A prospective study was conducted in pa- tients who received Codman ICP monitoring in ...Objective: To assess zero drift of intra- ventricular and subdural intracranial pressure (ICP) moni- toring systems. Methods: A prospective study was conducted in pa- tients who received Codman ICP monitoring in the neuro- surgical department from January 2010 to December 2011. According to the location of sensors, the patients were ca- tegorized into two groups: intraventricular group and sub- dural group. Zero drift between the two groups and its as- sociation with the duration of ICP monitor were analyzed. Results: Totally, 22 patients undergoing intraven- tricular ICP monitoring and 27 receiving subdural ICP moni- toring were enrolled. There was no significant difference in duration of ICP monitoring, zero drift value and its absolute value between intraventricular and subdural groups (5.38 d± 2.58 d vs 4.58 d.±2.24 d, 0.77 mmHg±2.18 mmHg vs 1.03 mmHg±2.06mmHg, 1.68 mmHg~.l.55 mmHgvs 1.70mmHg.t_l.53 mmHg, respectively; all P〉0.05). Absolute value of zero drift in both groups significantly rose with the increased duration of ICP monitoring (P〈0.05) while zero drift value did not. Moreover, daily absolute value in the intraventricular group was sig- nificantly smaller than that in the subdural group (0.27 mm Hg_+ 0.32 mm Hg vs 0.29 mm Hg_-_*0.18 mm Hg, P〈0.05). Conclusion: This study demonstrates that absolute value of zero drift significantly correlates with duration of both intraventricular and subdural ICP monitoring. Due to the smaller daily absolute value, ICP values recorded from intraventficular system may be more reliable than those from subdural system.展开更多
文摘The evolution of coronary intervention techniques and equipment has led to more sophisticated procedures for the treatment of highly complex lesions.However,as a result,the risk of complications has increased,which are mostly iatrogenic and often include equipment failure.Stent dislodgement warrants vigilance for the early diagnosis and a stepwise management approach is required to either expand or retrieve the lost stent.In the era of bioresorbable scaffolds that are not radiopaque,increased caution is required.Intravascular imaging may assist in detecting the lost scaffold in cases of no visibility fluoroscopically.Adequate lesion preparation is the key to minimizing the possibility of equipment loss;however,in the case that it occurs,commercially available and improvised devices and techniques may be applied.
基金Supported by the China High-Tech Ship Project of the Ministry of Industry and Information Technology under Grant No.[2019]360.
文摘Intermediate charging and sudden failure of automatic guided vehicles(AGVs)interrupt and severely affect the stability and efficiency of scheduling.Therefore,an AGV scheduling approach considering equipment failure and power management is proposed for outfitting warehouses.First,a power consumption model is established for AGVs performing transportation tasks.The powers for departure and task consumption are used to calculate the AGV charging and return times.Second,an optimization model for AGV scheduling is established to minimize the total transportation time.Different conditions are defined for the overhaul and minor repair of AGVs,and a scheduling strategy for responding to sudden failure is proposed.Finally,an algorithm is developed to solve the optimization model for a case study.The method can be used to plan the charging time and perform rescheduling under sudden failure to improve the robustness and dynamic response capability of AGVs.
文摘In case of the failure of Automatic Train Control (ATC), it is necessary to organize the train by Telephone Block System. In this paper, the APP system is built on the basis of local area network, which is focus on the simulation station map of Telephone Block System, Wain operation, equipment failure. This APP can vividly simulate the application of Telephone Block System in train urban transit organization.
基金supported by the National Natural Science Foundation of China(Grant No.51777067).
文摘In feeder automation transformation there are difficulties in equipment and location selection.To help with this,an optimal layout model of feeder automation equipment oriented to the type of fault detection and local action is pro-posed.It analyzes the coordination relationship of the three most common types of automation equipment,i.e.,fault indicator,over-current trip switch and non-voltage trip switch in the fault handling process,and the explicit expres-sions of power outage time caused by a fault on different layouts of the above three types of equipment are given.Given constraints of power supply reliability and the goal of minimizing the sum of equipment-related capital invest-ment and power interruption cost,a mixed-integer quadratic programming model for optimal layout is established,in which the functional failure probability of equipment is linearized using the 3δprinciple in statistics.Finally,the basic characteristics of the proposed model are illustrated by different scenarios on the IEEE RBTS-BUS6 system.It can not only take into account fault location and fault isolation to enhance user power consumption perception,but also can guide precise investment to improve the operational quality and efficiency of a power company.
文摘Objective: To assess zero drift of intra- ventricular and subdural intracranial pressure (ICP) moni- toring systems. Methods: A prospective study was conducted in pa- tients who received Codman ICP monitoring in the neuro- surgical department from January 2010 to December 2011. According to the location of sensors, the patients were ca- tegorized into two groups: intraventricular group and sub- dural group. Zero drift between the two groups and its as- sociation with the duration of ICP monitor were analyzed. Results: Totally, 22 patients undergoing intraven- tricular ICP monitoring and 27 receiving subdural ICP moni- toring were enrolled. There was no significant difference in duration of ICP monitoring, zero drift value and its absolute value between intraventricular and subdural groups (5.38 d± 2.58 d vs 4.58 d.±2.24 d, 0.77 mmHg±2.18 mmHg vs 1.03 mmHg±2.06mmHg, 1.68 mmHg~.l.55 mmHgvs 1.70mmHg.t_l.53 mmHg, respectively; all P〉0.05). Absolute value of zero drift in both groups significantly rose with the increased duration of ICP monitoring (P〈0.05) while zero drift value did not. Moreover, daily absolute value in the intraventricular group was sig- nificantly smaller than that in the subdural group (0.27 mm Hg_+ 0.32 mm Hg vs 0.29 mm Hg_-_*0.18 mm Hg, P〈0.05). Conclusion: This study demonstrates that absolute value of zero drift significantly correlates with duration of both intraventricular and subdural ICP monitoring. Due to the smaller daily absolute value, ICP values recorded from intraventficular system may be more reliable than those from subdural system.