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Previous many researches have confirmed that human adapt the position of digits to object attribute, for example, the shape of objects and center of mass (COM). Eight healthy subjects took part in the experiment (four females and four males, aged between 20 and 25 years), and they were righthanded. The goal of this research was to confirm the influence of object's vision and weight on digit placement...
Dexterous object manipulation requires suitable control of grip force, load force and digit positions. To keep an object stable in the air, force magnitude, force direction and digit positions should be coordinated, producing compensatory torque that could balance the external torque and maintain a minimal object roll. Six males and 6 females enrolled in the study. In the experiment, subjects were...
The purpose of this study was to explore the relationship between grip strength and inter-muscular coordination of the forearms and hands. Twenty-four healthy young volunteers participated in the experiment. The subjects were instructed to grip hydraulic hand dynamometer with five force levels-maximal voluntary contraction (MVC), 70% MVC, 50% MVC, 30% MVC and without any contraction. Muscle activity...
The thumb and index finger are important digits to performed dexterous and complex manipulation of objects. However, the local muscle fatigue will induce the capacity of force production and impair the precision motor control of the thumb and index finger. This study focused on the exercise-induced local muscle fatigue influencing the COP (center of pressure) area, the SD and the PA (projection angle)...
The postural instability was observed in patients following-stroke during standing, showing an altered center of mass acceleration (COMacc). This study aimed to investigate the effects of stroke on fluctuation and complexity of COMacc during quiet standing. Eleven stroke survivals and eleven gender- and age-matched healthy subjects participated in this experiment. The COMacc series in anteroposterior...
In this study, we aimed to recognize six hand motions using surface electromyogram (sEMG) signals recorded from eight muscles of the right hand. Twenty-five healthy subjects participated in this experiment. Data were segmented using windows of 250-ms length with a 150-ms overlapping. In this paper, we extracted 24 features per muscle. Three feature sets-the original features, the features produced...
The purpose of this study was to investigate changes of the maximal reaching distance (MRD) and the amplitude of electromyography (EMG) in lower limbs during reaching forward (RF) test with outstretched arm in the elderly. Ten healthy elderly subjects and ten healthy young subjects participated in this study. A position sensor was used to record the position coordinates of fingertip, and the EMG signals...
The standing balance undergoes declines with aging that contributes the fall of the elderly. But the age-related balance control during quiet standing upon a slope has not been fully understood. This study aimed to investigate the effects of aging on muscle activation during quiet standing on a slope with different angles. Sixteen healthy young subjects and 16 healthy elderly subjects participated...
In this paper, we aimed to investigate the difference between the surface electromyogram (sEMG) signals recorded from the right hand and left hand by means of the statistical analysis of the root mean square (RMS). Twenty-five healthy subjects participated in this experiment. For the entail 19 s recorded data of every repetition, we selected a window length of 250 ms data start from the beginning...
This study was designed to investigate the postural instability in stroke survivals during quiet standing. Eleven stroke patients and 11 healthy volunteers (gender- and age-matched) were recruited for this experiment. The center of pressure (COP) signals from both planta in anterior-posterior (AP) and medial-lateral (ML) directions were recorded using a three-dimensional motion capture system (BTS...
Patients with stroke usually have abnormal gait during walking. A hallmark of the post-stroke gait is the decreased knee flexion on the paretic leg compared to the non-paretic side. The objective of this study was to investigate the muscle contractions that are potentially responsible for the asymmetry of knee flexion in post-stroke patient. Ten stroke patients and 10 age- and sex-matched healthy...
The inter-digit coordination during precision grip was assessed using a recurrence-based phase synchronization (PS) analysis in this study. The PS across the normal forces of the thumb and index finger with respect to the contact surface serve as a critical dynamical strategy underlying precision grip. When both the thumb and index finger had reduced tactile sensitivity, the PS of Fz increased compared...
This study investigated the effect of tactile sensation on the fingertip center of pressure (COP) signals when the thumb and index finger interact with an object for stable precision grip. Thirty healthy subjects participated in the experiment. The tactile sensitivity was modulated by wrapping up the distal pads of the thumb and index finger with transparent polyethylene films. Subjects were instructed...
This study examined the fingertip force variability on the left and right hand during low-level sustained precision pinch with the thumb and index finger. Ten healthy, right-handed subjects were required to pinch a device with a stable force output at 5 N for 1 min. The pinch force was recorded for the right and left hand, separately. Visual feedback was provided for the first 30 s and removed for...
This work investigates structure analysis and design of metal interconnects for stretchable electronic circuits using the finite element software ABAQUS. In order to design a more promising structure of metal interconnect, the performance of different parameters (the inner radius, the angle and the width of the copper trace) of horseshoe shape is compared under the condition of uniaxial tensile. In...
Ionospheric phase decontamination is a key step to detect ship targets for OTHR. A PGA algorithm based on adaptive clutter filter bandwidth extraction is proposed for small amplitude, slowly varying type phase contamination that can be used to solve clutter filter bandwidth selection. STFT-SPWVD joint time-frequency distribution suppression algorithm is proposed for large amplitude, slowly varying...
This work investigates structure analysis and design of metal interconnects for stretchable electronic circuits using the finite element software ABAQUS. In order to design a more promising structure of metal interconnect, the performance of different parameters (the inner radius, the angle and the width of the copper trace) of horseshoe shape is compared under the condition of uniaxial tensile. In...
Aiming at solving the energy consumption and pollution problem of China's steel industry, this paper proposed an energy consumption prediction model by using intelligence algorithms based on selective ensemble theory. The main work of this paper is realizing the prediction model through BP artificial neural network and genetic algorithm, moreover, combining the 2 methods mentioned above to improve...
An estimation of distribution algorithm based gas scheduling method is proposed to optimize gas utilization with less emission. Firstly, gas energy flow network (G-EFN) is analyzed, the mathematical model of the gas scheduling is presented. Secondly, the process priority related to gas distribution is given, and a two-stage gas scheduling method is proposed. The major concern of the first stage is...
The degradation of high power white and blue light-emitting diodes (LEDs) was investigated by considering the electrical, optical and phosphor conversion. The LED samples were tested at the elevated temperature of 40°C with 700mA, 900mA, 1200mA. In order to research the degradation rule of fluorescent power in white LED, aging studies using white and blue LEDs with same batch of chips under same invariableness...
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