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Search Results: 1 - 10 of 29561 matches for " Loss of Control "
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Analysis of Transmission Loss in Droop Control of a Multi-Terminal HVDC System  [PDF]
Xiaodong Zhao, Kang Li, Min Zheng
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.24076
Abstract: High Voltage Direct Current (HVDC) electric power transmission is a promising technology for integrating offshore wind farms and interconnecting power grids in different regions. In order to maintain the DC voltage, droop control has been widely used. Transmission line loss constitutes an import part of the total power loss in a multi-terminal HVDC scheme. In this paper, the relation between droop controller design and transmission loss has been investigated. Different MTDC layout configurations are compared to examine the effect of droop controller design on the transmission loss.
The Role of a Novel Discrete-Time MRAC Based Motion Cueing on Loss of Control at a Hexapod Driving Simulator  [PDF]
B. Aykent, D. Paillot, F. Merienne, C. Guillet, A. Kemeny
Intelligent Control and Automation (ICA) , 2015, DOI: 10.4236/ica.2015.61010
Abstract: The objective of this paper is to present the advantages of Model reference adaptive control (MRAC) motion cueing algorithm against the classical motion cueing algorithm in terms of biomechanical reactions of the participants during the critical maneuvers like chicane in driving simulator real-time. This study proposes a method and an experimental validation to analyze the vestibular and neuromuscular dynamics responses of the drivers with respect to the type of the control used at the hexapod driving simulator. For each situation, the EMG (electromyography) data were registered from arm muscles of the drivers (flexor carpi radialis, brachioradialis). In addition, the roll velocity perception thresholds (RVT) and roll velocities (RV) were computed from the real-time vestibular level measurements from the drivers via a motion-tracking sensor. In order to process the data of the EMG and RVT, Pearson’s correlation and a two-way ANOVA with a significance level of 0.05 were assigned. Moreover, the relationships of arm muscle power and roll velocity with vehicle CG (center of gravity) lateral displacement were analyzed in order to assess the agility/alertness level of the drivers as well as the vehicle loss of control characteristics with a confidence interval of 95%. The results showed that the MRAC algorithm avoided the loss of adhesion, loss of control (LOA, LOC) more reasonably compared to the classical motion cueing algorithm. According to our findings, the LOA avoidance decreased the neuromuscular-visual cues level conflict with MRAC algorithm. It also revealed that the neuromuscular-vehicle dynamics conflict has influence on visuo-vestibular conflict; however, the visuo-vestibular cue conflict does not influence the neuromuscular-vehicle dynamics interactions.
Multiple Dispatching Reactive Power and Voltage Coordinated Control Method  [PDF]
Ting Yu, Tianjiao Pu, Wei Wang, Zhaoyu Jin, Ning Yang
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.54B125
Abstract:

This paper studies the reactive power and voltage coordinated control scheme. According to the characteristics of Hunan power grid, the coordinated schemes about Hunan power grid with Central China Power Grid, as well as Changsha power grid are proposed. At the same time, this paper builds a two-way interactive and multiple dispatching reactive power and voltage coordinated control mode, and can be successfully applied in Hunan power grid. The operation results show that this control scheme fulfills the ability of large power grids in optimal allocating of resources, effectively integrates the reactive power resources of the entire grid, achieves the purpose of reducing power grid loss, improving voltage quality, reducing the operating numbers of the reactive power equipment.

Policy on Water Loss Control in China  [PDF]
Xinyue Liu, Shihu Shu
Journal of Geoscience and Environment Protection (GEP) , 2018, DOI: 10.4236/gep.2018.63009
Abstract:
The Chinese government has raised great attention on water resources and environment over the past several years. In dealing with the issues of water pollution, water management, and the imbalance of water resources, China’s state council released “Water Pollution Prevention and Control Action Plan” in 2015. This policy has become a guideline to promote water sustainability in the long run. Since then, a number of regulatory policies were released to increase the focus on water conservation. Among those actions, water loss control associated with distribution systems is regarded as a key solution to improve water supply efficiency. This paper provided a comprehensive introduction to the framework of water loss control policy in China.
Effect of weight loss on metabolic control in people with type 2 diabetes mellitus: systematic review
Souto-Gallardo,M.a Cruces; Bacardí Gascón,M.; Jiménez Cruz,A.;
Nutrición Hospitalaria , 2011,
Abstract: objective: the aim of this systematic review was to examine randomized clinical trials (rct) regarding long-term effects of weight loss (wl) on biological markers in people with type 2 diabetes mellitus (t2dm). methods: we searched for articles published in english and spanish recorded in the databases of pubmed and cochrane , and the journal collections platforms of ebsco and scielo between january 1, 2000 and january 1, 2010. inclusion criteria included rct with follow-up ≥ 12 months. results: a total of 842 articles were identified, 95 of them contained information on the effect of wl on biological markers. twenty studies fulfilled the inclusion criteria. wl percentage ranged from 0.8 to 20%. a reduction of a1c was observed in nine studies, blood glucose in seven, of total cholesterol and ldl in four, systolic and diastolic blood pressure in three, and the use of hypoglycemic drugs in four; an increase of hdl was observed in seven studies. remission of t2dm was reported in only one study, which included surgical treatment. the quality of the studies ranged from very low to high; however, the study with the longest follow-up that did not involve surgical treatment, was 52 months. conclusion: the evidence of the beneficial effect of wl on biological markers on long-term studies in people with t2dm is inconclusive. these results warrant longer and better designed studies.
Selecting GLP-1 agonists in the management of type 2 diabetes: differential pharmacology and therapeutic benefits of liraglutide and exenatide
Jonathan Pinkney, Thomas Fox, Lakshminarayan Ranganath
Therapeutics and Clinical Risk Management , 2010, DOI: http://dx.doi.org/10.2147/TCRM.S7313
Abstract: ting GLP-1 agonists in the management of type 2 diabetes: differential pharmacology and therapeutic benefits of liraglutide and exenatide Review (4955) Total Article Views Authors: Jonathan Pinkney, Thomas Fox, Lakshminarayan Ranganath Published Date August 2010 Volume 2010:6 Pages 401 - 411 DOI: http://dx.doi.org/10.2147/TCRM.S7313 Jonathan Pinkney1, Thomas Fox1, Lakshminarayan Ranganath2 1Department of Diabetes and Endocrinology, Peninsula College of Medicine and Dentistry, Plymouth, United Kingdom; 2Department of Clinical Biochemistry and Metabolic Medicine, Royal Liverpool University Hospital, Liverpool, United Kingdom Abstract: Failure of secretion of the incretin hormone glucagon-like peptide-1 (GLP-1) plays a prominent role in type 2 diabetes, and restoration of GLP-1 action is an important therapeutic objective. Although the short duration of action of GLP-1 renders it unsuited to therapeutic use, 2 long-acting GLP-1 receptor agonists, exenatide and liraglutide, represent a significant advance in treatment. In controlled trials, both produce short-term glucose-lowering effects, with the reduction in hemoglobin A1c of up to 1.3%. These responses are often superior to those observed with additional oral agents. However, unlike sulfonylureas, thiazolidinediones, or insulin, all of which lead to significant weight gain, GLP-1 receptor agonists uniquely result in long-term weight loss of around 5 kg, and higher doses may enhance this further. Reduction in blood pressure of 2–7 mm Hg also has been observed. Both drugs produce transient mild gastrointestinal side effects; although mild hypoglycemia can occur, this is usually in combination with other hypoglycemic therapies. However, serious hypoglycemia and acute pancreatitis are rare. The once-daily dosage of liraglutide makes it more convenient than twice-daily dosage of prandial exenatide, and a superior glucose-lowering effect was observed in the only head-to-head comparison reported so far. Besides cost, these considerations currently favor liraglutide over exenatide. Further studies are needed to confirm long-term safety, and most importantly, that short-term benefits translate into long-term reductions of diabetes-related cardiovascular events and other complications.
SOME ASPECTS OF IMPROVING OF THE COR-RECTED PROCESSES OF THE TECHNOLOGY ADJUSTMENT OF A COMBINE HARVESTER Некоторые аспекты совершенствования процесса корректировки технологических регулировок зерноуборочного комбайна
Kataev V. S.
Polythematic Online Scientific Journal of Kuban State Agrarian University , 2012,
Abstract: The analysis of existing methods of the quality control process of grain harvesting is held. The possibilities of the improving of the control of the quality of a combine harvester are considered. The method for correc-tion of technological adjustments of the combine harvester, based on the electronic monitoring of a grain loss is developed
Extra Glycemic Impacts of GLP-1 Receptor Agonists: Benefits of a Class Effect?  [PDF]
Lis Marina de Mesquita Araújo, Sumaya Feguri, Thereza Lopes de Oliveira, Fernanda Batista Pedrosa, Rodrigo Garcez Guimar?es, Larissa Bianca Paiva Cunha de Sá, Denise Rosso Tenório Wanderley Rocha, Alberto Krayyem Arbex
Open Journal of Endocrine and Metabolic Diseases (OJEMD) , 2016, DOI: 10.4236/ojemd.2016.61007
Abstract: GLP-1 receptor agonists are approved for the treatment of type 2 diabetes, and more recently for obesity treatment.The glucagon-like-peptide-1 (GLP-1) is a glucose dependent hormone produced by intestinal cells, which is involved in insulin secretion and glucagon suppression. This hormone controls glucose plasma levels and reduces food intake. Additional effects were reported in slowing gastric emptying and in inducing satiety.In clinical practice, theGLP-1 receptor agonistsareassociated with significant reductions in glycosylated hemoglobin (HbA1c) and weight loss,despite showing a low risk of hypoglycemia.Beneficial effects have also been observed on blood pressureand lipid profile.The most common side effects associated with GLP-1 receptor agonists are gastro-intestinal motility disorders, such as nausea, vomiting and diarrhea, which are not associated withlong-term health risks. Therefore, GLP-1 receptor agonists represent a relevant medication for type 2 diabetes, whose benefits may go far beyond glycemic control.
The Benefits of SGLT2 Inhibitors in Cardiovascular Prevention, Glycemic Control and Weight Loss, in the Treatment of Diabetes  [PDF]
Bruna de Souza Faustino, Alberto dos Reis Costa Junior, Letícia Nascimento Medeiros Bortolon, Larissa Bianca Paiva Cunha de Sá, Denise Rosso Tenório Wanderley Rocha, Alberto Krayyem Arbex
Open Journal of Endocrine and Metabolic Diseases (OJEMD) , 2016, DOI: 10.4236/ojemd.2016.61012
Abstract: The sodium and glucose co-transporter inhibitors type 2 (SGLT2) comprises a new class of hypoglycemic drugs to control type 2 diabetes mellitus, in an attempt to add new non-existing benefits to the so far arising classes. Regarding this new class of drugs, represented by dapaglifozin, canaglifozin andempaglifozin, it is important to highlight the benefits brought by these medications to combat hyperglycemia with insulin-independent mechanisms that are beyond glucose reduction, such as cardiovascular events prevention, reduction in HbA1c, weight loss and blood pressure lowering. Recently, a relevant study (Empa-Reg) brought hope and set thespotlight on the prevention of cardiac events among diabetic patients, which is the main cause of mortality within this group. However, despite coming out as a good treatment option, SGLT2 inhibitors are under constant clinical research and, as a new drug, it should be carefully carried out regarding the long-term effects of glycosuria and other possible side effects, such as the observed increase in the incidence of bladder, breast cancer and bone fractures, which require further studies. Therefore, these compounds might represent a landmark approach for the treatment of diabetes.
Temporal Prediction of Aircraft Loss-of-Control: A Dynamic Optimization Approach  [PDF]
Chaitanya Poolla, Abraham K. Ishihara
Intelligent Control and Automation (ICA) , 2015, DOI: 10.4236/ica.2015.64023
Abstract: Loss of Control (LOC) is the primary factor responsible for the majority of fatal air accidents during past decade. LOC is characterized by the pilot’s inability to control the aircraft and is typically associated with unpredictable behavior, potentially leading to loss of the aircraft and life. In this work, the minimum time dynamic optimization problem to LOC is treated using Pontryagin’s Maximum Principle (PMP). The resulting two point boundary value problem is solved using stochastic shooting point methods via a differential evolution scheme (DE). The minimum time until LOC metric is computed for corresponding spatial control limits. Simulations are performed using a linearized longitudinal aircraft model to illustrate the concept.
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