scholarly journals Comparison of Type-1 and Type-2 Fuzzy Systems for Mineralization of Bioprinted Bone

2021 ◽  
Author(s):  
Ashkan Sedigh ◽  
Mohammad-R. Akbarzadeh-T ◽  
Ryan E. Tomlinson

ABSTRACTBioprinting is an emerging tissue engineering method used to generate cell-laden scaffolds with high spatial resolution. Bioprinting parameters, such as pressure, nozzle size, and speed, have a large influence on the quality of the bioprinted construct. Moreover, cell suspension density, cell culture period, and other critical biological parameters directly impact the biological function of the final product. Therefore, an approximation model that can be used to find the values of bioprinting parameters that will result in optimal bioprinted constructs is highly desired. Here, we propose type-1 and type-2 fuzzy systems to handle the uncertainty and imprecision in optimizing the input values. Specifically, we focus on the biological parameters, such as culture period, that can be used to maximize the output value (mineralization volume). To achieve a more accurate approximation, we have compared a type-2 fuzzy system with a type-1 fuzzy system using two levels of uncertainty. We hypothesized that type-2 fuzzy systems may be preferred in biological systems, due to the inherent vagueness and imprecision of the input data. Here, our results demonstrate that the type-2 fuzzy system with a high uncertainty boundary (30%) is superior to type-1 and type-2 with low uncertainty boundary fuzzy systems in the overall output approximation error for bone bioprinting inputs.

2012 ◽  
Vol 2012 ◽  
pp. 1-27 ◽  
Author(s):  
Ll Yi-Min ◽  
Yue Yang ◽  
Li Li

A novel indirect adaptive backstepping control approach based on type-2 fuzzy system is developed for a class of nonlinear systems. This approach adopts type-2 fuzzy system instead of type-1 fuzzy system to approximate the unknown functions. With type-reduction, the type-2 fuzzy system is replaced by the average of two type-1 fuzzy systems. Ultimately, the adaptive laws, by means of backstepping design technique, will be developed to adjust the parameters to attenuate the approximation error and external disturbance. According to stability theorem, it is proved that the proposed Type-2 Adaptive Backstepping Fuzzy Control (T2ABFC) approach can guarantee global stability of closed-loop system and ensure all the signals bounded. Compared with existing Type-1 Adaptive Backstepping Fuzzy Control (T1ABFC), as the advantages of handling numerical and linguistic uncertainties, T2ABFC has the potential to produce better performances in many respects, such as stability and resistance to disturbances. Finally, a biological simulation example is provided to illustrate the feasibility of control scheme proposed in this paper.


Diabetes ◽  
2019 ◽  
Vol 68 (Supplement 1) ◽  
pp. 851-P
Author(s):  
MELISSA S. FAULKNER

2020 ◽  
Vol 17 (1) ◽  
pp. 37-54
Author(s):  
Tatyana Chalakova ◽  
Yoto Yotov ◽  
Kaloyan Tzotchev ◽  
Sonya Galcheva ◽  
Boyan Balev ◽  
...  

: Type 1 diabetes mellitus (T1DM) is a chronic disease that starts early in life and often leads to micro- and macrovascular complications. The incidence of the disease is lower than that of type 2 DM and varies in different countries and ethnic groups, and the etiological and pathogenetic factors are different from T2DM. The aim of this overview is to investigate the effect of T1DM on all-cause mortality and CVD morbidity and mortality. During the last decades, the treatment of T1DM has improved the prognosis of the patients. Still, the mortality rates are higher than those of the age- and sex-matched general population. With the prolonged survival, the macrovascular complications and cardiovascular diseases (CVD) appear as major health problems in the management of patients with T1DM. The studies on the CVD morbidity and mortality in this disease group are sparse, but they reveal that T1DM is associated with at least 30% higher mortality. In comparison to healthy people, CVDs are more common in T1DM patients and they occur earlier in life. : Furthermore, they are a major cause for death and impaired quality of life in T1DM patients. The correlation between diabetic control and the duration of T1DM is not always present or is insignificant. Nevertheless, the early detection of the preclinical stages of the diseases and the risk factors for their development is important; similarly, the efforts to improve glycemic and metabolic control are of paramount importance.


Diabetes Care ◽  
2008 ◽  
Vol 31 (4) ◽  
pp. 672-677 ◽  
Author(s):  
J. W. Varni ◽  
C. A. Limbers ◽  
T. M. Burwinkle ◽  
W. P. Bryant ◽  
D. P. Wilson

2021 ◽  
Vol 3 (2) ◽  
pp. 1-7
Author(s):  
. Rendy ◽  
. Febyan ◽  
Krisnhaliani Wetarini

The hepatorenal syndrome is one of various potential causes of acute kidney injury in patients with decompensated liver disease. Hepatorenal syndrome is diagnosed based on reducing kidney function without any evidence of intrinsic kidney disease, including proteinuria, hematuria, or abnormal kidney ultrasonography. Clinically, hepatorenal syndrome is divided into two types named type 1 and type 2. The most favorable therapy for HRS cases is liver transplantation; however, only a few undergo this procedure due to the high mortality. Other modalities for hepatorenal syndrome therapy are pharmacology and non-pharmacology approaches. The purpose of management HRS is to optimize and stabilize the patient until an organ transplant available. This review aims to discuss the underlying pathophysiology and demonstrate the diagnostic approach of hepatorenal syndrome to determine the most appropriate therapeutic measures in clinical practice. The clinicians must be aware of management principles of hepatorenal syndrome to improve the quality of care for patients and optimize the clinical conditions.


2021 ◽  
Vol 24 (1) ◽  
pp. 30
Author(s):  
Pintaudi, B.

AIM OF THE STUDY To explore the distribution by cardiovascular risk groups according to the classification promoted by the ESC (European Society of Cardiology) of subjects with type 1 (T1D) and type 2 (T2D) diabetes cared for by Italian diabetologists and to describe the quality indicators of care, with particular regard to cardiovascular risk factors. DESIGN AND METHODS The study is based on data extracted from electronic medical records of patients treated at the 258 diabetes centers participating in the Annals AMD initiative and active in the year 2018. Patients with T1D or T2D were stratified by cardiovascular risk, in accordance with the recent ESC guidelines. General descriptive indicators and measures of intermediate outcomes, intensity/appropriateness of pharmacological treatment for diabetes and cardiovascular risk factors, presence of other complications and overall quality of care were evaluated. RESULTS Overall, 29,368 adults with T1D and 473,740 subjects with T2D were evaluated. Among subjects with T1D: 64.7% were at very high cardiovascular risk, 28.5% at high risk and the remaining 6.8% at moderate risk. Among subjects with T1D at very high-risk: 54.7% had retinopathy, 29.0% had albuminuria, 7.3% had a history of major cardiovascular event, 47.3% had organ damage, 48.9% had three or more risk factors, and 70.6% had a diabetes duration of over 20 years. Among subjects with T2D: 78.5% were at very high cardiovascular risk, 20.9% at high risk and the remaining 0.6% at moderate risk. Among those with T2D at very high risk: 39.0% had organ damage, 89.1% had three or more risk factors, 18.7% had a previous major cardiovascular event, 26,4% had retinopathy, 39.5% had albuminuria. With regard to the glucose-lowering drugs: the use of DPPIV-i increased markedly as cardiovascular risk increased; the use of secretagogues also increased and, although within low percentages, also the use of GLP1-RA tended to increase. The use of SGLT2-i is also still limited, and only slightly higher in subjects with very high cardiovascular risk. In both types of diabetes, the overall quality of care, as summarized by the Q score values, tended to be lower as the level of cardiovascular riskincreased. CONCLUSIONS The analysis of a large population such as that of the AMD Annals database allowed to highlight the characteristics and quality indicators of care of subjects with T1D and T2D in relation to cardiovascular risk classes. A large proportion of subjects appear to be at high or very high risk. Glucose-lowering drug therapies seem not to be adequately used with respect to the potential advantages in terms of reduction of cardiovascular risk of some drug categories (GLP1-RA and SGLT2-i) and, conversely, with respect to the potential risks related to the use of other pharmacological classes (sulfonylureas). Several actions are necessary to optimize care and improve the quality of care for both subjects with T1D and T2D. KEY WORDS type 1 diabetes; type 2 diabetes; cardiovascular risk; quality indicators of care.


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