Hierarchical Scheduling of an SDF/L Graph onto Multiple Processors

Although dataflow models are known to thrive at exploiting task-level parallelism of an application, it is difficult to exploit the parallelism of data, represented well with loop structures, since these structures are not explicitly specified in existing dataflow models. SDF/L model overcomes this shortcoming by specifying the loop structures explicitly in a hierarchical fashion. We introduce a scheduling technique of an application represented by the SDF/L model onto heterogeneous processors. In the proposed method, we explore the mapping of tasks using an evolutionary meta-heuristic and schedule hierarchically in a bottom-up fashion, creating parallel loop schedules at lower levels first and then re-using them when constructing the schedule at a higher level. The efficiency of the proposed scheduling methodology is verified with benchmark examples and randomly generated SDF/L graphs.

Parallel Loop Binding Compression Suture, a Modified Procedure for Pernicious Placenta Previa Complicated With Placenta Increta

Objective: To evaluate the efficacy and safety of parallel loop binding compression suture of the lower uterus during cesarean section in pernicious placenta previa complicated with placenta increta.Methods: This retrospective study was performed in patients with pernicious placenta previa complicated with placenta increta or percreta between November 2014 and December 2020 at the Qilu Hospital of Shandong University. Patients underwent parallel loop binding compression suture surgery were defined as study group, and patients underwent traditional surgery with figure-of-eight sutures as the main hemostatic method were defined as control group. Postpartum hemorrhage was evaluated as the primary outcome. The secondary outcomes included age, gestational weeks, operative time, fetal childbirth time, prevention of hysterectomy, blood transfusion, duration of postoperative catheterization, duration of antibiotic treatment, and postoperative hospitalization (days). Additionally, neonatal outcomes were evaluated.Results: A total of 124 patients were enrolled in the study, including 38 patients receiving parallel loop binding compression suture surgery in the study group, and 86 patients in the control group. With parallel loop binding compression suture, the average operation time was significantly reduced (109.0 ± 33.5 vs. 134.4 ± 54.2 min, p = 0.00), and the volume of blood lost were also decreased (2152.6 ± 1169.4 vs. 2960.5 ± 1963.6 ml, p = 0.02), which correspondingly reduced RBC transfusion (7.2 ± 3.5 vs. 10.3 ± 8.7 units, p = 0.03) and FFP transfusion (552.6 ± 350.3 vs. 968.0 ± 799.8 ml, p = 0.00). The fetal childbirth time was extended (14.1 ± 5.6 vs. 11.0 ± 8.0 min, p = 0.03), however, there was no increase in NICU admission rates (36.9 vs. 34.9%, p = 0.83). Except for one premature infant (32 weeks) death in the control group, all infants at our hospital were safely discharged after treatment.Conclusion: Parallel loop binding compression suture is an effective, swift, practical, and safe method to reduce postpartum bleeding in women with pernicious placenta previa, complicated with placenta increta. Besides, it has no adverse effects on newborns.

Parallel loop binding compression suture, a modified procedure for pernicious placenta previa complicated with placenta increta: a retrospective study. (with video)

Objective. To evaluate the efficacy and safety of parallel loop binding suture of the lower uterus during cesarean section in pernicious placenta previa complicated with placenta increta. Design. A retrospective study Setting. Qilu Hospital of Shandong University Population. Patients with pernicious placenta previa between November 2014 and December 2020 at the Qilu Hospital of Shandong University were eligible. Methods. The degree of placental invasion was evaluated using preoperative color Doppler ultrasonography and/or magnetic resonance imaging (MRI). Main outcome measures. Postpartum hemorrhage was evaluated as the primary outcome. Additionally, neonatal outcomes were evaluated. Results. Of the 38 patients, only 3 (7.89%) underwent hysterectomy due to massive blood loss. With parallel loop binding compression suture, the volume of blood lost ranged from 500 - 6000 (mean: 2152.63±1169.37) mL and the volume of blood transfused was between 400 - 3200 (1431.58±699.85) mL. The mean gestational age was 36 weeks and 2 days (range: 32+6 to39+6 weeks). The average operation time was 109.78 ± 33.49 min, and the average fetal childbirth time was 14.05±5.60 min. The rate of NICU admission was 36.84% (14/38). The postoperative menstrual cycle and menstrual flow both returned to normal levels. All infants at our hospital were safely discharged after treatment. Conclusion. Parallel loop binding compression suture is an effective, swift, practical, and safe method to reduce postpartum bleeding in women with pernicious placenta previa, complicated with placenta increta.

Parallel Loop Control for Torque and Angular Velocity of BLDC Motors with DTC Commutation

This paper is focused in the development of a parallel control loop of the angular velocity and torque for Brushless Direct Current (BLDC) motors. This parallel loop is proposed as an improvement for the performance of those cascaded solutions commonly reported in the body of literature of the field. Performance is improved by reducing the steady state error of the speed considerably when compared with the typical cascaded loop solution under a commanded change of torque. In addition, the steady state response of the parallel loop is reached in a shorter time. Simulations were designed to carry out a comparison between both methodologies. The results of these simulations consider only changes in the set point for speed or torque and are reported here. The control signal was applied to a simulated driver using a switching method known as Direct Torque Control of 2 and 3 phases (DTC-2+3P). These preliminary results show that the parallel control loop outperforms the cascaded control of BLDC motors.