The Experts below are selected from a list of 85833 Experts worldwide ranked by ideXlab platform
Quan Yang - One of the best experts on this subject based on the ideXlab platform.
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Optimization of Short Stroke Control Curve in Hot Strip Mill
2016Co-Authors: Fem Modelling, Quan Yang, Hongtao Zhu, Kiet A. TieuAbstract:Abstract: The slab edge rolling has been widely used in the roughing stand of hot strip mill to Control the width of the slab. However, the slab edge rolling and consequent horizontal rolling will cause a significant width change in the head part and tail part of the slab, which have to be trimmed before the finishing stands. The short Stroke Control (SSC) technology has been developed to overcome this problem. In this paper, the finite element method (FEM) has been used to simulate the unsteady edge rolling process. Three SSC Control curves have been compared in order to obtain the best width Control result. The optimized SSC Control curve has been applied to the industrial rolling mill
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Optimization of Short Stroke Control Preset for Automatic Width Control of Hot Rolling Mill
Journal of Iron and Steel Research International, 2010Co-Authors: Quan Yang, Lu Cheng, Ai-li Wang, Tieu KietAbstract:Automatic width Control is a key issue in hot strip rolling process. The edge rolling has been widely used in the roughing stand of hot strip mill to Control the width of the slab. However, the edge rolling and consequent horizontal rolling will cause a significant width change in the head part and tail part of the slab, which have to be trimmed before the finishing stands. Based on the width reduction deformation curve of the head and tail along the longitudinal direction of slab, the short Stroke Control (SSC) technology has been developed to overcome this problem. The finite element method has been used to simulate the unsteady edge rolling process. Three short Stroke Control curves have been compared in order to obtain the best width Control result. The optimized short Stroke Control curve has been applied to the automatic width Control system of industrial hot rolling mill, and good performance is obtained.
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Optimization of Short Stroke Control Curve in Hot Strip Mill by FEM Modelling
Advanced Materials Research, 2009Co-Authors: Quan Yang, Hongtao Zhu, A. Kiet TieuAbstract:The slab edge rolling has been widely used in the roughing stand of hot strip mill to Control the width of the slab. However, the slab edge rolling and consequent horizontal rolling will cause a significant width change in the head part and tail part of the slab, which have to be trimmed before the finishing stands. The short Stroke Control (SSC) technology has been developed to overcome this problem. In this paper, the finite element method (FEM) has been used to simulate the unsteady edge rolling process. Three SSC Control curves have been compared in order to obtain the best width Control result. The optimized SSC Control curve has been applied to the industrial rolling mill.
Liu Xiang-hua - One of the best experts on this subject based on the ideXlab platform.
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Width Control for Head and Tail of Hot Strip Based on Particle Swarm Genetic Optimization
Ironmaking & Steelmaking, 2011Co-Authors: Liu Xiang-huaAbstract:To improve the width Control precision of hot strip during rough rolling for prediction,the method of head and tail shape short Stroke Control(SSC) was usually adopted.For the current situation of low head and tail width Control precision of conventional short Stroke Control model in practice,a new swarm intelligence optimization method—particle swarm genetic optimization(PSGO) algorithm was used to optimize short Stroke Control model parameters based on practical data.The practical application proves that short Stroke Control model after using particle swarm genetic optimization algorithm can Control strip head and tail width and width steady portion within one point eight millimeters,shorten width tolerance length,strip head and tail cut loss rate reduces to under two percents.
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Self-Learning Strategy of Short Stroke Control for Head and Tail of Hot Strip
Journal of Iron and Steel Research, 2010Co-Authors: Liu Xiang-huaAbstract:For the present situation of rough rolling strip head and tail low width precision on hot strip,the cause of strip head and tail width tolerance was analyzed,and the short Stroke Control(SSC for short) solving method was advanced.For low Control precision of conventional short Stroke Control model in practice,the short Stroke Control online self-learning function was exploited.Through the method of addition self-learning,the self-learning of the short Stroke Control model parameters was realized using actual width data after rolling.The practical application at some domestic hot rolling mill show that short Stroke Control model after self-learning can Control strip head and tail width and width of steady portion in two millimeters and metallic yield enhances to over ninety-eight percents.
Shiyan Wang - One of the best experts on this subject based on the ideXlab platform.
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Magnetic resonance spectroscopy and the Loewenstein assessment for evaluating cognition after a Stroke
Chinese Journal of Physical Medicine and Rehabilitation, 2018Co-Authors: Zun-ke Gong, Mi Wang, Shiyan Wang, Xuxia Wang, Wei ChenAbstract:Objective To explore the cognitive impairment of Stroke survivors using magnetic resonance spectra (MRS) and the Loewenstein occupational therapy cognitive assessment (LOTCA), and to analyze their correlation and their clinical significance. Methods Thirty Stroke survivors diagnosed with cognitive impairment using the mini-mental state examination formed a cognitive impairment group. Another 30 Stroke survivors without cognitive impairment served as Stroke Controls, while a third group of 30 healthy counterparts were the normal Controls. All were assessed using magnetic resonance imaging and the LOTCA and the results were correlated. Results The average LOTCA total score and sub-scores of the impaired group were significantly lower than those of the other two groups. The average LOTCA total scores and the orientation and spatial perception, apparent motion and thinking operation sub-scores of the Stroke Control group were also significantly lower than those of the normal Control group, though their average visual perception and motor praxis scores were not. The average levels of N-acetyl aspartate and creatine (NAA and Cr) in the bilateral hippocampus of the cognitively impaired group were significantly lower than among the Controls, while their choline and creatine (Cho/Cr) levels were significantly higher. The average NAA/Cr and Cho/Cr levels in the bilateral hippocampus of the Stroke Control group were similarly significantly lower and higher than among the healthy Controls. The average NAA/Cr levels in the left and right hippocampus were weakly to moderately correlated with the total LOTCA scores and the LOTCA sub-score for attention (r=0.376-0.661 and r=0.396-0.691 respectively). The average value of Cho/Cr in the left hippocampus showed weak to moderate negative correlation with the LOTCA total scores (r=-0.368-0.619), but not with the attention scores. The value of Cho/Cr in the right hippocampus had weak to moderate negative correlation with the LOTCA total score and with the orientation, visual perception, visuo-motor organization and thinking operations sub-scores (r=-0.391-0.632), but no obvious correlation with the scores for spatial perception, motor praxis or attention. Conclusion MRS can be used to assess the cognitive impairment of Stroke survivors. MRS and LOTCA scores are closely correlated. MRS combined with LOTCA can evaluate cognitive dysfunction more comprehensively and objectively. Key words: Stroke; Cognitive impairment; Magnetic resonance spectra; Loewenstein occupational therapy cognitive assessment
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Clinical application of the Loewenstein occupational therapy cognitive assessment in assessing the cognition of Stroke patients
Chinese Journal of Physical Medicine and Rehabilitation, 2012Co-Authors: Zun-ke Gong, Wei Chen, Liang Han, Mi Wang, Shiyan WangAbstract:Objective To explore the applicability of the Loewenstein occupational therapy cognitive assessment (LOTCA) in evaluating cognitive function and observing the curative effect of Stroke treatment.Methods Thirty Stroke patients with cognitive impairment (the cognitive impairment group) and thirty Stroke patients without marked cognitive impairment (the Stroke Control group) were screened using the mini-mental status examination (MMSE),and thirty healthy subjects served as a normal Control group.The gender distributions,ages and levels of education of the three groups were matched.All cases were examined with the LOTCA.After two months of treatment,the three groups were assessed again.Results The average total scores and the scores on the LOTCA subitems were significantly lower in the cognitive impairment group than in the Stroke Control group and were even lower than those in the normal Control group.Particularly conspicuous were their lower scores on the thinking operations and orientation and visuo-motor organization LOTCA sub-items,In the Stroke Control group the average scores on the thinking operations,visuo-motor organization,attention,orientation and spatial perception sub-items were all significantly lower than those in the normal Control group,especially on the thinking operations and visuo-motor organization sub-items.After treatment,the LOTCA scores in all three groups had improved significantly compared with before treatment.Conclusion The LOTCA can assess the severity and characteristics of cognitive impairment in Stroke patients.It offers an effective method for identifying cognitive impairment and tracking any improvements.The scores reflect patients' cognitive levels,and so have clinical value. Key words: Stroke; Cognition disorders; Loewenstein occupational therapy cognitive assessment
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Comparison and analysis of cognitive assessment between Loewenstein occupational therapy cognitive assessment and mini-mental state examination in Stroke patients
Chinese Journal of Physical Medicine and Rehabilitation, 2012Co-Authors: Wei Chen, Zun-ke Gong, Liang Han, Ming Zhang, Shiyan WangAbstract:Objective To compare the assessment results of Loewenstein occupational therapy cognitive assessment (LOTCA) and mini-mental state examination(MMSE) in Stroke patients,and to analyze the correlation between the two assessments and to explore the applicable values of LOTCA in assessing vascular cognitive function impairment (VCI). Methods According to the diagnostic standard of cognitive impairment with MMSE,thirty Stroke patients with cognitive impairment were selected as cognitive impairment group,thirty Stroke patients without markedly cognitive impairment as Stroke Control group,and thirty normal subjects served as normal Control group.All the subjects' age,gender and level of education were matched in the three groups. All the subjects were assessed with LOTCA and MMSE. Results The total scores of LOTCA had high positive correlation with the total scores of MMSE in cognitive impairment group ( r =0.934,P ＜ 0.01 ),the correlations were also found between every sub-items of LOTCA and those of MMSE (P ＜ 0.01 ).The total scores and the scores of sub-items of LOTCA in cognitive impairment group were significantly lower than those in Stroke Control group and were those in normal Control group(P ＜ 0.01 ),particularly lower scores in LOTCA sub-items of thinking operations,orientation,visuomotor organization.The scores of sub-items of LOTCA,including thinking operations,visuo-motor organization,attention,orientation,spatial perception were all significantly lower in Stroke Control group than those in normal Control group(P ＜0.01 ),especially in thinking operations and visuo-motor organization sub-items. Conclusions Correlations were found between LOTCA and MMSE.Compared to MMSE,LOTCA could detect vascular cognitive function impairment earlier and is much more comprehensive,so it is suitable to assess vascular cognitive impairment patients with no dementia. Key words: Stroke; Loewenstein occupational therapy cognitive assessment; Mini-mental state examination; Vascular cognitive function impairment
Mario Zuccarello - One of the best experts on this subject based on the ideXlab platform.
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Place of Drug Therapy in the Treatment of Carotid Stenosis
CNS Drugs, 2005Co-Authors: Norberto Andaluz, Mario ZuccarelloAbstract:Carotid stenosis is an important cause of transient ischaemic attacks and Stroke. The cause of carotid stenosis is most often atherosclerosis; contributing to the pathogenesis of the lesion are endothelial injury, inflammation, lipid deposition, plaque formation, fibrin, platelets and thrombin. Carotid stenosis accounts for 10–20% of cases of brain infarction, depending on the population studied. Despite successful treatment of selected patients who have had an acute ischaemic Stroke with tissue plasminogen activator and the promise of other experimental therapies, prevention remains the best approach to reducing the impact of ischaemic Stroke. High-risk or Stroke-prone patients can be identified and targeted for specific interventions At this juncture, treatment of carotid stenosis is a well established therapeutic target and a pillar of Stroke prevention. There are two main strategies for the treatment of carotid stenosis. The first approach is to stabilise or halt the progression of the carotid plaque through risk factor modification and medication. Hypertension, diabetes mellitus, smoking, obesity and high cholesterol levels are closely associated with carotid stenosis and Stroke; Control of these factors may decrease the risk of plaque formation and progression. The second approach is to eliminate or reduce carotid stenosis through carotid endarterectomy or carotid angioplasty and stenting. Carotid endarterectomy, which is the mainstay of therapy for severe carotid stenosis, is beyond the scope of this review Anticoagulants seem to play little role (if any) in the medical (i.e. non-surgical)treatment of carotid stenosis. Adoption of a healthy lifestyle combined with the reduction of risk factors has been shown to lead to a reduction in the extent of carotid stenosis. The medical treatment of carotid stenosis should be based on the triad of the reduction of risk factors, patient education, and use of antiplatelet agents
Jun-ya Nagase - One of the best experts on this subject based on the ideXlab platform.
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Model Predictive Control for Tendon-Driven Balloon Actuator under Constraints on Simulation
Applied Mechanics and Materials, 2015Co-Authors: Jun-ya Nagase, Kazuki Hamada, Toshiyuki Satoh, Norihiko SagaAbstract:Many pneumatic actuators have been developed in order to be lightweight with high output for decreasing impact force. So far, a pneumatic tendon-driven balloon actuator (balloon actuator) which is compact and lightweight has been developed for a robot hand and a rehabilitation device. However, for pneumatic actuator, it is difficult to maintain exact Control because these actuators have constraints. For this study, we developed a Stroke Control system for a balloon actuator using a constrained model predictive Control (MPC) scheme that can consider constraints of the plant output. As described in this paper, we compared and evaluated the Control performance using MPC and PID.
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IECON - Comparison between PFC and PID Control system for tendon-driven balloon actuator
IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, 2013Co-Authors: Jun-ya Nagase, Kazuki Hamada, Toshiyuki Satoh, Norihiko Saga, Koichi SuzumoriAbstract:In recent years, Japanese society has been aging, engendering a labor shortage of young workers. For a robot that is often in contact with people and which must provide safety and flexibility in nursing and welfare, the development of a soft, lightweight, and compact actuator has been sought. Particularly robots that are intended for use in the field of medical care and welfare should be safe when functioning around humans because they often come into contact with people. Therefore, a tendon-driven balloon actuator (balloon actuator) has been developed for a robot hand to be used in such environments. For this study, we developed a Stroke Control system for a balloon actuator using a predictive functional Control (PFC). Predictive functional Control is one model based on a predictive Control (MPC) scheme, which predicts the future outputs of the actual plant over the prediction horizon and computes the Control effort over the Control horizon at every sampling instance. This paper reports the PFC Control performance of the balloon actuator. We compared the Control performance for the actuator with that of a PFC and PID Control system.
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Predictive Functional Control System for Stroke Control of a Pneumatic Tendon-driven Balloon Actuator
Romansy 19 – Robot Design Dynamics and Control, 2013Co-Authors: Jun-ya Nagase, Toshiyuki Satoh, Norihiko Saga, Koichi SuzumoriAbstract:In recent years, Japanese society has been aging, engendering a labor shortage of young workers. Robots are therefore expected to be useful to perform tasks such as day-to-day work support for elderly people. Consequently, a tendon-driven balloon actuator has been developed for a robot hand in such environments. This study evaluated Stroke Control characteristics of a balloon actuator using a predictive functional Control (PFC) system. Predictive functional Control, a model based on predictive Control (MPC) schemes, predicts the future outputs of the actual plant over the prediction horizon and computes the Control effort over the Control horizon at every sampling instance. Herein, PFC Control performance of a one-link finger using a pneumatic balloon actuator is reported.
