keyword
https://read.qxmd.com/read/38446651/amplitude-adaptive-modulation-of-neural-oscillations-over-long-term-dynamic-conditions-a-computational-study
#21
JOURNAL ARTICLE
Zhaoyu Quan, Yan Li, Xi Cheng, Yingnan Nie, Shouyan Wang
Closed-loop deep brain stimulation (DBS) shows great potential for precise neuromodulation of various neurological disorders, particularly Parkinson's disease (PD). However, substantial challenges remain in clinical translation due to the complex programming procedure of closed-loop DBS parameters. In this study, we proposed an online optimized amplitude adaptive strategy based on the particle swarm optimization (PSO) and proportional-integral-differential (PID) controller for modulation of the beta oscillation in a PD mean field model over long-term dynamic conditions...
March 6, 2024: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://read.qxmd.com/read/38443950/two-ferroptosis-specific-expressed-genes-nox4-and-parp14-are-considered-as-potential-biomarkers-for-the-diagnosis-and-treatment-of-diabetic-retinopathy-and-atherosclerosis
#22
JOURNAL ARTICLE
Chen Li, QinHua Cai
OBJECTIVES: Both Diabetic retinopathy (DR) and Atherosclerosis (AS) are common complications in patients with diabetes, and they share major pathophysiological similarities and have a common pathogenesis. Studies performed to date have demonstrated that ferroptosis plays a vital part in the occurrence and development of DR and AS, but its mechanism in the two diseases remains poorly understood. METHODS: DR Chip data (GSE60436 and GSE102485) and AS chip data (GSE100927 and GSE57691) were obtained from the Gene Expression Omnibus (GEO) database...
March 5, 2024: Diabetology & Metabolic Syndrome
https://read.qxmd.com/read/38435585/a-low-cost-wireless-extension-for-object-detection-and-data-logging-for-educational-robotics-using-the-esp-now-protocol
#23
JOURNAL ARTICLE
Emma I Capaldi
In recent years, inexpensive and easy to use robotics platforms have been incorporated into middle school, high school, and college educational curricula and competitions all over the world. Students have access to advanced microprocessors and sensor systems that engage, educate, and encourage their creativity. In this study, the capabilities of the widely available VEX Robotics System are extended using the wireless ESP-NOW protocol to allow for real-time data logging and to extend the computational capabilities of the system...
2024: PeerJ. Computer Science
https://read.qxmd.com/read/38427543/robust-adaptive-fuzzy-control-for-second-order-euler-lagrange-systems-with-uncertainties-and-disturbances-via-nonlinear-negative-imaginary-systems-theory
#24
JOURNAL ARTICLE
Vu Phi Tran, Mohamed A Mabrok, Sreenatha G Anavatti, Matthew A Garratt, Ian R Petersen
Ensuring robust and precise tracking control in the presence of uncertain multi-input-multi-output (MIMO) system dynamics and environmental variations is a significant challenge in the field of robust and adaptive control theory. While fuzzy control strategies have demonstrated good tracking performance in normal conditions, designing and tuning fuzzy controllers can be a challenging task in highly uncertain environments. In this study, we investigate a novel approach that combines robust nonlinear negative-imaginary (NI) systems theory with a self-adaptive fuzzy control scheme and the Lyapunov synthesis to develop a robust adaptive negative-imaginary-fuzzy (RANIF) control scheme...
March 1, 2024: IEEE Transactions on Cybernetics
https://read.qxmd.com/read/38426742/statin-administration-ameliorates-ischemia-induced-overactive-bladder-with-improvement-of-blood-flow-and-anti-inflammatory-effects-in-rats
#25
JOURNAL ARTICLE
Yuichi Ishizuka, Yohei Satake, Shingo Kimura, Shinichi Yamashita, Naoki Kawamorita, Akihiro Ito
AIMS: Statins are widely used to treat dyslipidemia and have been shown to reduce the risk of ischemic heart disease and cerebrovascular disease. The effects of statins on ischemia-induced overactive bladder (OAB) and the associated mechanisms were investigated in a rat model of chronic pelvic ischemia. METHODS: A pelvic ischemia model was created by iliac arterial injury (AI) and a high-fat diet using male Sprague-Dawley rats. Rats were assigned to 3 groups: control group, AI group, and AI + statin group...
March 1, 2024: Neurourology and Urodynamics
https://read.qxmd.com/read/38424248/controlled-synchronization-of-three-co-rotating-exciters-based-on-a-circular-distribution-in-a-vibratory-system
#26
JOURNAL ARTICLE
Lei Jia, Yang Tian, Ziliang Liu, Xin Zhang
In this article, an engineering problem of three co-rotating exciters with the circular distribution in a vibrating system is investigated. The dynamical model constructed by the motion differential equations is established. By introducing the small parameter averaged method in the dynamic equation, the synchronization and stability conditions of the electromechanical coupling dynamical model is derived. To illustrate the necessity of the controlling method, the self-synchronization of the vibrating system is firstly analyzed with the theory, numerical simulations and experiments...
February 29, 2024: Scientific Reports
https://read.qxmd.com/read/38422962/analysis-and-design-of-antithetic-proportional-integral-derivative-biocontrol-systems-with-species-dilution
#27
JOURNAL ARTICLE
Xun Deng, Hui Lv, Qiang Zhang, Edmund Ming Kit Lai
The nonlinearity and non-separability of the antithetic PID (aPID) controller have provided greater flexibility in the design of biochemical reaction networks (BCRNs), resulting in significant impacts on biocontrol-systems. Nevertheless, the dilution of control species is disregarded in designs of aPID controllers, which would lead to the failure of inhibition mechanism in the controller and loss of robust perfect adaptation (RPA)-the biological counterpart of robust steady-state tracking. Here, the impact of dilution processes on the structure of aPID is investigated in this study...
February 27, 2024: Computers in Biology and Medicine
https://read.qxmd.com/read/38422052/enhancing-the-landing-guidance-of-a-reusable-launch-vehicle-by-improving-genetic-algorithm-based-deep-reinforcement-learning-using-hybrid-deterministic-stochastic-algorithm
#28
JOURNAL ARTICLE
Larasmoyo Nugroho, Rika Andiarti, Rini Akmeliawati, Sastra Kusuma Wijaya
The PbGA-DDPG algorithm, which uses a potential-based GA-optimized reward shaping function, is a versatiledeep reinforcement learning/DRLagent that can control a vehicle in a complex environment without prior knowledge. However, when compared to an established deterministic controller, it consistently falls short in terms of landing distance accuracy. To address this issue, the HYDESTOC Hybrid Deterministic-Stochastic (a combination of DDPG/deep deterministic policy gradient and PID/proportional-integral-derivative) algorithm was introduced to improve terminal distance accuracy while keeping propellant consumption low...
2024: PloS One
https://read.qxmd.com/read/38420418/design-of-uncertain-displacement-controlled-velocity-control-system-for-hydraulic-actuator
#29
JOURNAL ARTICLE
Jabbar H Mohmmed, Ahmed K Hassan, Muslim Ali, Samer A Kokz, Muhanad Hamed Mosa, A K Kareem, Ahmed A Zainulabdeen, Z C Feng
Displacement-controlled systems have high efficiency and are widely used in industry. Accurate control of the actuator motion in hydraulic systems is usually a necessity in industrial applications such as the motion of control surfaces in fixed-wing airplanes for flight control as well as the aircraft brake systems. To address this need, the current study was conducted with the goal of developing a high-fidelity model to achieve precise control. This work focused on modeling a hydrostatic transmission that is used for controlling a linear actuator velocity...
February 29, 2024: Heliyon
https://read.qxmd.com/read/38400446/low-cost-plant-protection-unmanned-ground-vehicle-system-for-variable-weeding-using-machine-vision
#30
JOURNAL ARTICLE
Huangtao Dong, Jianxun Shen, Zhe Yu, Xiangyu Lu, Fei Liu, Wenwen Kong
This study presents a machine vision-based variable weeding system for plant- protection unmanned ground vehicles (UGVs) to address the issues of pesticide waste and environmental pollution that are readily caused by traditional spraying agricultural machinery. The system utilizes fuzzy rules to achieve adaptive modification of the Kp, Ki, and Kd adjustment parameters of the PID control algorithm and combines them with an interleaved period PWM controller to reduce the impact of nonlinear variations in water pressure on the performance of the system, and to improve the stability and control accuracy of the system...
February 17, 2024: Sensors
https://read.qxmd.com/read/38392115/the-design-and-control-of-a-biomimetic-binocular-cooperative-perception-system-inspired-by-the-eye-gaze-mechanism
#31
JOURNAL ARTICLE
Xufang Qin, Xiaohua Xia, Zhaokai Ge, Yanhao Liu, Pengju Yue
Research on systems that imitate the gaze function of human eyes is valuable for the development of humanoid eye intelligent perception. However, the existing systems have some limitations, including the redundancy of servo motors, a lack of camera position adjustment components, and the absence of interest-point-driven binocular cooperative motion-control strategies. In response to these challenges, a novel biomimetic binocular cooperative perception system (BBCPS) was designed and its control was realized...
January 24, 2024: Biomimetics
https://read.qxmd.com/read/38392110/adaptive-skid-steering-control-approach-for-robots-on-uncertain-inclined-planes-with-redundant-load-bearing-mobility
#32
JOURNAL ARTICLE
Lin Zhang, Baoyu Wang, Enguang Guan, Xun Liu, Muhammad Saqib, Yanzheng Zhao
Climbing manufacturing robots can create a revolutionary manufacturing paradigm for large and complex components, while the motion control of climbing manipulation-oriented robots (CMo-Rs) is still challenging considering anti-slippage problems. In this study, a CMo-R with full-scenery climbing capability and redundant load-bearing mobility is designed based on magnetic adsorption. A four-wheel kinematic model considering the slipping phenomenon is established. An adaptive kinematic control algorithm based on slip estimation using Lyapunov theory is designed for uncertain inclined planes...
January 23, 2024: Biomimetics
https://read.qxmd.com/read/38390012/-preparing-for-epidemics-a-strategy-for-strengthening-social-science-skills-in-africa
#33
JOURNAL ARTICLE
Alice Desclaux, Blandine Bila, Marc Egrot, Khoudia Sow
The Covid pandemic was a reminder of the need to be prepared for epidemics and pandemics and to take into account their socio-political dimensions by developing socioanthropological and interdisciplinary approaches. In the post-crisis era, the challenge is one of operationality. How can these dimensions be made more visible? How can we develop analyses that can help to humanize institutional responses, make inequalities visible to limit them during the crisis, reveal structural determinants of transmission, and define interventions that are scientifically sound, ethically just and respectful of diversity?Three strategies are relevant to meet these challenges: (1) more social scientists in Frenchspeaking Africa must get expertise on epidemics to investigate associated issues before, during and after epidemic crisis; (2) public health professionals, health and social workers must get informed about social, historical, economic and political aspects of epidemics that shape risk, care and control; (3) collaborations between researchers and those involved in responding to epidemics on the basis of shared knowledge must develop...
December 31, 2023: Med Trop Sante Int
https://read.qxmd.com/read/38379983/dynamics-analysis-of-permanent-magnet-synchronous-motor-speed-control-with-enhanced-state-feedback-controller-using-a-linear-quadratic-regulator
#34
JOURNAL ARTICLE
Crescent Onyebuchi Omeje, Ayodeji Olalekan Salau, Candidus Ugwoke Eya
This paper presents a robust speed regulation and control of a permanent magnet synchronous motor (PMSM). A linear quadratic regulator (LQR) based state feedback controller was developed to achieve a successful suppression of periodic disturbance of speed and torque. Sliding mode observer in conjunction with the disturbance observer was deployed in the control of motor speed. Simulations were carried out based on two compared controllers such as the state feedback controller and the conventional proportional-integral-derivative (PID) controller to attenuate the noisy effects of the external disturbance...
February 29, 2024: Heliyon
https://read.qxmd.com/read/38373756/clinical-observation-on-inverted-t-shaped-herb-separated-moxibustion-for-chronic-pelvic-pain-in-sequelae-of-pelvic-inflammatory-diseases
#35
JOURNAL ARTICLE
Menglin Gong, Tingting Deng, Yuying Li, Fanjie Liu, Ning Liu, Ying Yin
OBJECTIVES: To compare the clinical effect between inverted T-shaped herb-separated moxibustion combined with western medication and simple western medication on chronic pelvic pain(CPP)in sequelae of pelvic inflammatory diseases. METHODS: A total of 60 patients with CPP in sequelae of pelvic inflammatory diseases were randomly divided into an observation group and a control group, 30 cases in each group. The control group was given ibuprofen tablets 10 days before menstruation, 0...
February 12, 2024: Zhongguo Zhen Jiu, Chinese Acupuncture & Moxibustion
https://read.qxmd.com/read/38366672/efficacy-and-safety-of-filgotinib-for-the-treatment-of-perianal-fistulizing-crohn-s-disease-divergence-2-a-phase-2-randomized-placebo-controlled-trial
#36
JOURNAL ARTICLE
Walter Reinisch, Jean-Frederic Colombel, Geert R D'Haens, Jordi Rimola, Tomasz Masior, Matt McKevitt, Xuehan Ren, Adrian Serone, David A Schwartz, Krisztina B Gecse
BACKGROUND AND AIMS: There is an unmet need for the treatment of perianal fistulizing Crohn's disease [PFCD]. This study evaluated the efficacy and safety of the Janus kinase 1 preferential inhibitor filgotinib, for the treatment of PFCD. METHODS: This phase 2, double-blind, multicentre trial enrolled adults with PFCD and prior treatment failure. Participants were randomized [2:2:1] to receive filgotinib 200 mg, filgotinib 100 mg, or placebo once-daily orally for up to 24 weeks...
February 16, 2024: Journal of Crohn's & Colitis
https://read.qxmd.com/read/38358916/matreshca-microtesla-apparatus-for-transfer-of-resonance-enhancement-of-spin-hyperpolarization-via-chemical-exchange-and-addition
#37
JOURNAL ARTICLE
Shiraz Nantogma, Md Raduanul H Chowdhury, Mohammad S H Kabir, Isaiah Adelabu, Sameer M Joshi, Anna Samoilenko, Henri de Maissin, Andreas B Schmidt, Panayiotis Nikolaou, Yuri A Chekmenev, Oleg G Salnikov, Nikita V Chukanov, Igor V Koptyug, Boyd M Goodson, Eduard Y Chekmenev
We present an integrated, open-source device for parahydrogen-based hyperpolarization processes in the microtesla field regime with a cost of components of less than $7000. The device is designed to produce a batch of 13 C and 15 N hyperpolarized (HP) compounds via hydrogenative or non-hydrogenative parahydrogen-induced polarization methods that employ microtesla magnetic fields for efficient polarization transfer of parahydrogen-derived spin order to X-nuclei (e.g., 13 C and 15 N). The apparatus employs a layered structure (reminiscent of a Russian doll "Matryoshka") that includes a nonmagnetic variable-temperature sample chamber, a microtesla magnetic field coil (operating in the range of 0...
February 15, 2024: Analytical Chemistry
https://read.qxmd.com/read/38342919/simulation-of-a-control-method-for-active-kinesiotherapy-with-an-upper-extremity-rehabilitation-exoskeleton-without-force-sensor
#38
JOURNAL ARTICLE
Piotr Falkowski, Kajetan Jeznach
Exoskeleton-aided active rehabilitation is a process that requires sensing and acting upon the motion intentions of the user. Typically, force sensors are used for this. However, they increase the weight and cost of these wearable devices. This paper presents the methodology for detecting users' intentions only with encoders integrated with the drives. It is unique compared to other algorithms, as enables active kinesiotherapy while adding no sensory systems. The method is based on comparing the measured motion with the one computed with the idealised model of the multibody system...
February 11, 2024: Journal of Neuroengineering and Rehabilitation
https://read.qxmd.com/read/38341505/research-on-variable-universe-fuzzy-pid-control-for-semi-active-suspension-with-cdc-dampers-based-on-dynamic-adjustment-functions
#39
JOURNAL ARTICLE
Guanggang Ji, Lidong Zhang, Mingda Cai, Xianke Meng, Zhengyu Du, Jiuhong Ruan, Shenhao Guan, Zhiwen Liu
The vehicle suspension system is a complex system with multiple variables, nonlinearity and time-varying characteristics, and the traditional variable universe fuzzy PID control algorithm has the problems of over-reliance on expert experience and non-adaptive adjustment of the contracting-expanding factor parameters, which make it difficult to achieve a better control effect. In this paper, the system error e(t) and its change rate ec(t) are introduced into the contracting-expanding factor as dynamic parameters to realize the adaptive adjustment of the contracting-expanding factor parameters, and propose a variable universe fuzzy PID control based on dynamic adjustment functions (VUFP-DAF), which uses the real-time contracting-expanding factor to realize the adaptive adjustment of the fuzzy universe, so as to improve the ride comfort of vehicles...
February 11, 2024: Scientific Reports
https://read.qxmd.com/read/38339662/developing-a-cloud-based-air-quality-monitoring-platform-using-low-cost-sensors
#40
JOURNAL ARTICLE
Abdul Samad, Joschka Kieser, Ioannis Chourdakis, Ulrich Vogt
Conventional air quality monitoring has been traditionally carried out in a few fixed places with expensive measuring equipment. This results in sparse spatial air quality data, which do not represent the real air quality of an entire area, e.g., when hot spots are missing. To obtain air quality data with higher spatial and temporal resolution, this research focused on developing a low-cost network of cloud-based air quality measurement platforms. These platforms should be able to measure air quality parameters including particulate matter (PM10, PM2...
February 1, 2024: Sensors
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