Switching Strategy Research Articles

Integrated Power-Efficient Time-Frequency Operations With DRX and BWP Switching

Bandwidth part (BWP) and discontinuous reception (DRX) are critical designs to help devices save power. Unlike DRX, a time-domain power-saving mechanism, the BWP is a frequency-domain mechanism newly proposed in the 3GPP NR system. The interaction between the two mechanisms needs investigation for performance optimization. Therefore, this work proposed a joint design for the BWP switching algorithm and analytical models. The simulation results showed that when the DRX cycle is 320 ms, and the packet arrival rate is 0.01/ms, our method improves 31.4% of packet delay or 19.5% of power consumption compared to the baselines. We also showed the range of the traffic arrival rate that a UE with both mechanisms configured is sensitive to the BWP switch strategy.

AI‐enabled bumpless transfer control strategy for legged robot with hybrid energy storage system

AbstractDesigning Hybrid energy storage system (HESS) for a legged robot is significant to improve the motion performance and energy efficiency of the robot. However, switching between the driving mode and regenerative braking mode in the HESS may generate a torque bump, which has brought significant challenges to the stability of the robot locomotion. To address this issue, an AI‐enabled control strategy for bumpless transfer switching is proposed, which is composed of a Proximal Policy Optimisation (PPO)‐based non‐linear active disturbance rejection controller and Deep neural network (DNN)‐based bumpless transfer strategy. We indicate that the proposed intelligent strategy solves bumpless transfer by reducing the torque bump during the system switching process. Meanwhile, the authors analyse the energy driving subsystem and the energy regenerating subsystem based on operational modes and the energy flow. Via the parameters tuning criterion, the authors adopt a PPO algorithm to adaptively tune the parameters of the non‐linear active disturbance rejection controller, which can improve the performance of the primary torque control. A DNN‐based intelligent bumpless transfer strategy is proposed to set the initial value of two switching controllers at a switching moment. Simulations and experimental results validate the effectiveness of the proposed control strategy.

Pathophysiology and Clinical Management of Dyslipidemia in People Living with HIV: Sailing through Rough Seas.

Infections with human immunodeficiency virus (HIV) and acquired immune deficiency syndrome (AIDS) represent one of the greatest health burdens worldwide. The complex pathophysiological pathways that link highly active antiretroviral therapy (HAART) and HIV infection per se with dyslipidemia make the management of lipid disorders and the subsequent increase in cardiovascular risk essential for the treatment of people living with HIV (PLHIV). Amongst HAART regimens, darunavir and atazanavir, tenofovir disoproxil fumarate, nevirapine, rilpivirine, and especially integrase inhibitors have demonstrated the most favorable lipid profile, emerging as sustainable options in HAART substitution. To this day, statins remain the cornerstone pharmacotherapy for dyslipidemia in PLHIV, although important drug-drug interactions with different HAART agents should be taken into account upon treatment initiation. For those intolerant or not meeting therapeutic goals, the addition of ezetimibe, PCSK9, bempedoic acid, fibrates, or fish oils should also be considered. This review summarizes the current literature on the multifactorial etiology and intricate pathophysiology of hyperlipidemia in PLHIV, with an emphasis on the role of different HAART agents, while also providing valuable insights into potential switching strategies and therapeutic options.

Research on collaborative edge network service migration strategy based on crowd clustering

The innovative application of Crowd Intelligent Devices (CIDS) in edge networks has garnered attention due to the rapid development of artificial intelligence and computer technology. This application offers users more reliable and low-latency computing services through computation offloading technology. However, the dynamic nature of network terminals and the limited coverage of edge servers pose challenges, such as data loss and service interruption. Furthermore, the high-speed mobility of intelligent terminals in the dynamic edge network environment further complicates the design of computation offloading and service migration strategies. To address these challenges, this paper explores the computation offloading model of cluster intelligence collaboration in a heterogeneous network environment. This model involves multiple intelligences collaborating to provide computation offloading services for terminals. To accommodate various roles, a switching strategy of split-cluster group collaboration is introduced, assigning the cluster head, the alternate cluster head, and the ordinary user are assigned to a group with different functions. Additionally, the paper formulates the optimal offloading strategy for group smart terminals as a Markov decision process, taking into account factors such as user mobility, service delay, service accuracy, and migration cost. To implement this strategy, the paper utilizes the deep reinforcement learning-based CCSMS algorithm. Simulation results demonstrate that the proposed edge network service migration strategy, rooted in groupwise cluster collaboration, effectively mitigates interruption delay and enhances service migration efficiency.

“Two in one”: A novel DNA cascade amplification strategy for trace detection of dual targets

According to the characteristics of DNA programming, the cascaded nucleic acid amplification technology with larger output can overcome the problem of insufficient sensitivity of single nucleic acid amplification technology, and it combines the advantages of two or even multiple nucleic acid amplification technologies at the same time. In this work, a novel cascade signal amplification strategy with strand displacement amplification (SDA) and cascade hybridization chain reaction (HCR) was proposed for trace detection of hAAG and VEGF165. HAAG-induced SDA produced a large amount of S2 to open H2 on Polystyrene (PS) nanospheres, thereby triggering cascade HCR to form DNA dendritic nanostructures with rich fluorescence (FL) signal probes (565 nm). It could realize the amplification of FL signals for the detection of hAAG. Moreover, many doxorubicin (Dox) were loaded into the GC bases of DNA dendritic nanostructures, and its FL signal was effectively shielded. VEGF165 specifically bound to its aptamer to form G-quadruplex structures, which released Dox to produce a high FL signal (590 nm) for detection of VEGF165. This work developed a unique multifunctional DNA dendritic nanostructure fluorescence probe, and cleverly designed a new “On-off” switch strategy for sensitive trace detection of cancer markers.

Adaptive virtual leader–leader–follower based formation switching for multiple autonomous tracked mobile robots in unknown obstacle environments

This article investigates the formation switching problem of a group of autonomous tracked mobile robots (ATMRs) traveling in unknown obstacle environments. Firstly, a novel formation structure model of virtual leader–leader–follower is designed, where the leader tracks the virtual leader determined by a reference trajectory, while the followers track their desired positions dictated by the virtual leader. Subsequently, a dynamic optimization formation switching strategy is developed, in which the leader calculates a formation adjustment factor in real-time to dynamically adjust the formation parameters according to the environmental constraints. Furthermore, a comprehensive performance evaluation index system is presented to assess formation switching efficiency, leveraging the inherent simplicity of the ATMR’s kinematics. Finally, extensive numerical simulations and physical experiments are carried out to validate the effectiveness of the proposed strategies.

Entry under placement uncertainty

We present a model of firm entry in an industry that operates under an aggregate production quota or cap-and-trade (CAT) regulation. Firms are heterogeneous in their own productivity; each knows its costs of production but is uncertain about where its costs rank among an entrant population. We show the existence of a unique, symmetric, dominance solvable, Bayesian Nash equilibrium in switching strategies in a parameterized game with a continuum of players. Our main result is that uncertainty over one's productivity rank is sufficient to cause socially inefficient over-entry when the average cost in the population of potential entrants is low. We find socially inefficient under-entry when the opposite conditions hold. Within both the class of models on global games with strategic substitutes and the class of models on firm entry, our model offers innovative insights into inefficient over-entry, under-entry, and introduces a novel underlying mechanism that drives entry bias.

Self-Stabilizing Control Strategy of Stabilized Platform for Rotary Steerable Drilling System Based on Adaptive Backstepping Control

To enhance the robustness of the toolface angle control in a fully rotary steerable drilling tool, a backstepping control law and a drilling fluid flow adaptive law are devised based on the dynamic model of the stable platform. The Lyapunov function is constructed, and it is proven that the adaptive backstepping control system of the stabilized platform is stable. Furthermore, in order to address problems such as the friction dead zone and excessive rotational kinetic energy in the stabilized platform system, which could cause toolface angle oscillations and the rapid rotation of the stabilized platform, we additionally propose an online estimation method for the balancing torque and velocity-angle control switching strategy. By combining the backstepping control law, drilling fluid flow adaptive law, and velocity-angle control switching strategy, a self-stabilizing control strategy for the stabilized platform is established. In comparison with the PID control method, the simulation results show the superiority of the proposed scheme under complex disturbances from a downhole environment. And the drilling simulation experiment results indicate that the proposed control method has a good anti-interference capability under various conditions, including drilling fluid flow rate, inclination angle, and drill collar rotational speed. Therefore, the proposed control method can improve the robustness of the stabilized platform control system.

New coordinated drive mode switching strategy for distributed drive electric vehicles with energy storage system

High performance and comfort are key features recommended in hybrid electric vehicle (HEV) design. In this paper, a new coordination strategy is proposed to solve the issue of undesired torque jerks and large power ripples noticed respectively during drive mode commutations and power sources switching. The proposed coordinated switching strategy uses stair-based transition function to perform drive mode commutations and power source switching’s within defined transition periods fitting the transient dynamics of power sources and traction machines. The proposed technique is applied on a battery/ supercapacitor electric vehicle whose traction is ensured by two permanent magnet synchronous machines controlled using direct torque control and linked to HEV front and rear wheels. Simulation results highlight that the proposed coordinated switching strategy has a noteworthy positive impact on enhancing HEV transient performance as DC bus fluctuations were reduced to a narrow band of 6 V and transient torque ripples were almost suppressed.

Large eddy simulation of combustion characteristics during dual fuel switching process in gas turbine combustor

The present study aims to investigate the combustion characteristics, fuel switching strategy, and flame stability associated with fuel switching processes in a dual-fuel gas turbine combustor. Specifically, the Large Eddy Simulation method is employed in conjunction with a skeletal chemical reaction mechanism to simulate the fuel switching process. It is revealed that the presence of a local rich combustion zone, formed by an increased accumulation of fuel in the head region, leads to the displacement of the heat release position towards the downstream inner shear layer. Additionally, this condition causes a reduction in the recirculation zone area and a deterioration in the uniformity of fuel blending. Simultaneously, the combustor experiences low-frequency, high-amplitude pressure pulsations, as well as pulsations in the heat release rate. Furthermore, a comparative analysis is conducted to assess the discrepancies among three distinct fuel supply strategies employed during fuel switching. The fast-opening strategy is found to demonstrate superior performance indicators, as it accomplishes filling the combustor performance indicators within 80% of the allocated time due to its lower initial fuel changing rate.

Unravelling the optimal strategy on the stable mineralized anammox granular systems in treating low-strength wastewater

Effective retention of anammox bacteria (AnAOB) is the prerequisite for the application of anammox process, especially in treating low-strength wastewater. The employment of anammox granules coupled with phosphorus minerals has gained extensive attention as retaining biomass. To achieve the stability of mineralized anammox system for low-strength wastewater treatment, two switching strategies (cascade strategy and plunging strategy) were compared in terms of nitrogen removal performance, physicochemical properties and microbial community. Results showed cascade strategy significantly implemented the nitrogen removal rate of 0.86 ± 0.05 kg N/m3/d at hydraulic retention time of 1.6 h, with higher phosphorus removal via the hydroxyapatite formation. The cross-section observation indicated mineralized anammox granules exhibited a unique spatially heterogeneous structure with distinct zoning. Moreover, the granules displayed dense structure, excellent settleability, superior mechanical strength and outstanding biomass retention based on cascade strategy. Microbial analysis revealed the dominant populations were shifted from Ca. Kuenenia to Ca. Brocadia after switching to low-strength conditions. Further investigation is warranted to explore effective methods for phosphorus recovery from hydroxyapatite. Overall, the study provided a reference for promoting and understanding the synergistic nitrogen removal and phosphorus recovery in actual applications.

Patterns of phonetic cue switching in older adults

Primary phonetic cues for identifying speech in quiet may be unreliable in background noise, requiring listeners to utilize cues more resistant to masking to accurately recognize speech. Previous experiments demonstrated that individuals rely mainly on voice onset time (VOT) to categorize /bir/-/pir/ sounds in quiet but rely on fundamental frequency (F0) when VOT is masked by noise. As older adults report challenges perceiving speech in noise, the current study investigated whether older adults exhibited poor ability to switch reliance from VOT to F0 in broadband noise. Young (aged 18–30) and older (aged 55+) adults with normal or near-normal hearing categorized /bir/ and /pir/ sounds that were manipulated on a continuum of VOT and F0. No group differences were found in cue weights in quiet or when noise was presented at a signal-to-noise ratio (SNR) of 0 dB. However, when SNR ranged from + 6 to -4 dB, young adults relied on F0 even at the best SNR, whereas older adults continued relying on VOT until significantly poorer SNRs, suggesting that older adults may exhibit maladaptive strategies for phonetic cue switching. Continued use of cues even as they become less reliable may help explain why older adults experience difficulty identifying speech in noise.

Treatment-emergent sexual dysfunctions due to antidepressants: A primer on assessment and management strategies.

Antidepressants (ADs) are among the most commonly prescribed drugs worldwide. Persons with mental illness taking ADs commonly report sexual dysfunction (SD) related to treatment. A brief discussion on the neurobiology of sexual functioning and mechanism of treatment-emergent SD (TESD) was performed. The incidence of prevalence of TESD in various studies has been reviewed. TESD impacts patients as it frequently leads to nonadherence, while psychiatrists have challenges in proceeding forward with treatment in such patients. Assessment of patients with suspected TESD is described with a focus on practical tips for clinicians. Five strategies (watchful waiting, drug holiday, downward titration, switching, and add-on therapy) to manage TESD have been extensively discussed with evidence in the literature. Each strategy comes with its own bag of advantages and drawbacks, which have been pointed out for simplicity. A detailed discussion on individual pharmacological strategies is given, and options for non-pharmacological management that can be tried are enlisted. Common clinical case scenarios have been discussed to incorporate the implementation of this literature.

Research on the optimization of the temperature field distribution of a multi-source microwave agent system based on event-triggered

Aiming at the problem of optimizing temperature distribution and heating efficiency in a multi-source microwave agent system, a collaborative tracking strategy using an event-triggering approach is explored. Firstly, setting the control object as a switch to optimize the system control process, a new cooperative switching strategy of event-triggered is designed to intensify the process of energy distribution by changing the time–frequency distribution of power. Secondly, exploring multi-agent architecture with an event-triggered multi-microwave source system to minimize communication frequency and energy consumption for faster agreement. Then, The material grouping strategy divides all materials into four categories based on their characteristics. Two materials, potato (group (a)) and SiC (group (c)) are selected for experimentation. Finally, a simple and easy-to-implement multi-source microwave numerical heating model was constructed using finite element analysis. The heating law described in this article was tested through experiments. The results showed that using this method increased the utilization rate of microwave energy in SiC by a maximum of 9.67% compared to traditional heating methods. Furthermore, it improved the temperature uniformity while maintaining excellent quality. Additionally, the energy utilization efficiency of potatoes was maximized by 8.76%, and the temperature uniformity was improved mostly by 12.04%.

Online Switching Strategy Between Dual Three-Phase PMSM and Open-Winding PMSM

Online Switching Strategy Between Dual Three-Phase PMSM and Open-Winding PMSM

National Security Priorities for a Sustainable Energy Transition

Relevance. Problems of the sustainability of national economic systems continue to remain relevant for a long time. States continue to interact on climate agendas and environmental topics in a tense geopolitical situation. Expanding the implementation of carbon footprint reduction technologies is becoming a prerequisite for partnerships and entry into new international markets for the supply of products and services. National priorities of states today are moving closer together due to the growing climate crisis, which dictates the need to intensify work on the implementation of ESG projects. The purpose of the study was to analyze the current state of the movement to reduce the carbon footprint and the results of the implementation of declared initiatives within the framework of international agreements. Objectives. The article set and consistently solved the following tasks: a review of the current state of climate change in the environment and the impact of declining environmental quality on the health and longevity of the population was carried out, an assessment was made of the sectoral contribution of various sectors of the economy to the formation and accumulation of greenhouse gases in the atmosphere, an assessment of modern compensation carbon impact tools. Methodology. The work used methods of logical analysis, content analysis, statistical analysis of data on emissions and inputs, graphical and horizontal analysis, generalization and systematization of data. Results. An assessment of the current state of this problem made it possible to summarize the conclusions and results of research on this topic and to identify the main national priorities related to the implementation of strategies for switching to renewable energy sources. Conclusions. The article provides an overview of the level of implementation of resource-saving technologies in various sectors of the Russian national economy. Conclusions are drawn about the need to continue the environmental modernization of the national economic system and expand interstate cooperation on climate change issues and a sustainable energy transition to resource-saving technologies.

A comprehensive high‐level automated driving assistance system with integrated multi‐functionality

AbstractAdvanced Driver Assistance Systems (ADAS) have gained substantial attention in recent years. However, the integration mechanism of multiple functions within ADAS remains unexplored, and the full potential of its functionality remains underutilised. This paper presents a novel multi‐functional integrated High‐level Automated Driving Assistance System that combines the Cruise Control (CC), Adaptive Cruise Control (ACC), Automated Emergency Brake (AEB), and Automated Lane Change (ALC) functions. The presented system utilises a hierarchical framework. The extension multi‐mode switch strategy is established as the superior module and the Event‐Triggered Model Predictive Controller (ETMPC) is designed as the inferior controller. The CC, ACC, and ALC functions are effectively utilised to enhance traffic efficiency, while the AEB function ensures driving safety. To address the time constraints of conventional Model Predictive Control, an event‐trigger mechanism is proposed to reduce computational load. Simulations are conducted using the CarSim and Matlab platforms. The study results demonstrate significant improvements in both safety and traffic efficiency compared to conventional ADAS strategies. Furthermore, the proposed ETMPC method significantly reduces the frequency of solving Optimisation Problems and decreases online computation costs.

Research on fault diagnosis of electromagnetic active suspension based on double observer intelligent switching

Electromagnetic active suspension can adjust stiffness and damping and is widely used in suspension. When the electromagnetic active suspension fails, the observer can be used for fault detection. In order to realize suspension fault detection under all road conditions, a double observer switching strategy is designed and simulated using MATLAB. Firstly, the switching strategies of the Kalman observer, unknown input observer (UIO) and double observer are designed, respectively. Then, for random roads, the Kalman observer is used for fault detection, while for bump road surfaces, the UIO is used for fault detection. The residoubles of the dynamic deflection of the suspension are used as switching conditions. Finally, a simulation analysis is carried out with MATLAB, and the conclusion shows that the switching strategy of double observers is better than that of the Kalman observer and UIO in full road conditions.

Sex differences in the effectiveness and tolerability of dolutegravir plus rilpivirine as a switch strategy in people living with HIV.

Dolutegravir + rilpivirine (DTG + RPV) is an effective antiretroviral therapy regimen approved in clinical guidelines as a switch therapy for virologically suppressed people with HIV. Our study aimed to compare the effectiveness and tolerability of DTG + RPV in women and men in real-world clinical practice. This was a retrospective analysis of treatment-experienced people with HIV from a large HIV unit who switched to DTG + RPV. We analysed treatment effectiveness, rates of adverse events and discontinuation, and metabolic changes after 48 weeks of treatment. HIV-RNA levels <50 copies/mL were analysed at 48 weeks using both intention-to treat analysis (where missing data were interpreted as failures) and per-protocol analysis (excluding those with missing data or changes due to reasons other than virological failure). Outcomes were compared between women and men based on sex at birth. A total of 307 patients were selected (71 women and 236 men). No transgender people were included. At baseline, women had lived with HIV infection and received antiretroviral therapy for longer than men (23.2 vs 17.4 years and 18.9 vs 14.2 years, respectively). In the intention-to-treat analysis, 74.6% (95% confidence interval [CI] 63.4-83.3%) of women and 83.5% (95% CI 78.2-87.7) of men had HIV-RNA <50 copies/mL. In the per-protocol analysis, 96.4% (95% CI 87.7-99) of women and 99% (95% CI 98.9-99.7) of men had HIV-RNA levels <50 copies/mL. Two women and two men had HIV-RNA >50 copies/mL at 48 weeks. Discontinuation due to adverse events was more frequent in women than in men: 12.7% vs 7.2% (p < 0.02). Neuropsychiatric and gastrointestinal events were the most frequently reported. A median (interquartile range) weight gain of 1.9 kg (0-4.2) in women and 1.2 kg (-1-3.1) in men was reported (median of differences between baseline visit and week 48); the remaining changes in metabolic parameters were neutral. DTG + RPV exhibited good and similar virological effectiveness in women and men in real-world settings. However, poorer tolerability and more treatment interruptions were observed in women.

A loading rate switch strategy for stable nitritation in mainstream municipal wastewater

A loading rate switch strategy for stable nitritation in mainstream municipal wastewater