Robust H∞ Observer-based Stabilization of Linear Discrete-time Systems with Parameter Uncertainties

Cherifa Bennani,Fazia Bedouhene,Hamza Bibi,Ali Zemouche,Rajesh Rajamani,Khadidja Chaib-Draa,Abdel Aitouche 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.9

This paper addresses the problem of observer-based stabilization of discrete-time linear systems in presence of parameter uncertainties and ℓ2-bounded disturbances. We propose a new variant of the classical two-stepLMI approach. In the first step, we use a slack variable technique to solve the optimization problem resulting from stabilization by a static state feedback. In the second step, a part of the slack variable obtained is incorporated in the H∞ observer-based stabilization problem, to calculate simultaneously the Lyapunov matrix and the observer-based controller gains. The effectiveness of the proposed design methodology is demonstrated using the dynamic model of a quadruple-tank flow process system. Additional numerical illustrations are presented to show the superiority of the proposed Modified Two-Step Method (MTSM) from a LMI feasibility point of view.

Analysis of a force reconstruction problem

Jacquelin, E.,Bennani, A.,Massenzio, M. Techno-Press 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.21 No.3

This article deals with the reconstruction of an impact force. This requires to take measurements from the impacted structures and then to deconvolve those signals from the impulse response function. More precisely, the purpose of the work described here is to analyse the method of deconvolution and the problems that it implies. Thus, it is highlighted that the associated deconvolution problem depends on the location of the measurement points: it is possible or not to reconstruct the force of impact in function of the location of this point. Then, the role of the antiresonances is linked up with this problem. The singular value decomposition is used to understand these difficulties. Numerical predictions are compared and validated with experiments.

Analysis of a force reconstruction problem

E. Jacquelin,A. Bennani,M. Massenzio 국제구조공학회 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.21 No.3

Expression of Histo-blood Group Antigens in Tumor and Adjacent Normal Breast Tissues as Prognostic Markers of Breast Carcinoma

Soukaina Zouine,Farida Marnissi,Nada Otmani,Mohamed Bennani Othmani,Nabil Zaid,Kevin Kojok,Younes Zaid,Nadia Tahiri Jouti,Norddine Habti 한국유방암학회 2020 Journal of breast cancer Vol.23 No.1

Purpose: Aberrant glycosylation of the histo-blood group antigens (including the angina bullosa haemorrhagica [ABH]) is often observed during malignant transformation in most types of carcinomas. Data concerning their ethnic distributions are diverse which explains why their biological characteristics have to be studied in different populations. Our aim was to analyze the expression of the histo-blood group (specifically the ABH) antigens in breast carcinoma. Methods: The expression of the histo-blood group (specifically the ABH) antigens was studied in 109 patients with breast carcinoma using immunohistochemistry. Statistical analysis was performed using χ2 and Fisher analyses. Results: The loss of expression of histo-blood group (ABH) antigens in breast carcinoma was observed in 81.13% of patients with blood group O, 37.93% with blood group A, and 96.30% with blood group B. One key finding of this study was that the loss of expression of the ABH antigen was also observed in normal tissues adjacent to the tumor. The loss of expression was associated with higher tumor grade (p < 0.05). Expression of H antigen was observed in 50% of cases with loss of expression of B antigen and was associated with human epidermal growth factor receptor 2 (HER2) overexpression (p < 0.05). The loss of H antigen in patients with blood group O was associated with estrogen receptor expression (p < 0.001). Incompatible A antigen in tumor was expressed in 20.75% of patients with blood group O. Conclusion: Loss of the ABH antigens correlated with the Scarff-Bloom-Richardson histologic grading. H antigen was associated with HER2 overexpression in breast cancer. However, further studies are needed to determine the role of incompatible A antigen in mammary carcinogenesis.

Real-Time Monitoring System to Manage Mental Healthcare Emergency Unit

Samy Housbane,Adil Khoubila,Khaoula Ajbal,Mohamed Agoub,Omar Battas,Mohamed Bennani Othmani 대한의료정보학회 2020 Healthcare Informatics Research Vol.26 No.4

Objectives: Real-time relevant information helps guide the healthcare decision-making process in daily clinical practice aswell as the management and optimization of healthcare processes. However, proprietary business intelligence suite solutionssupporting the production of decision-making information requires investment that is out of reach of small and mediumsizedhealthcare facilities or those with limited resources, particularly in developing countries. This paper describes our experiencein designing and implementing a real-time healthcare monitoring system solution to manage healthcare emergencyunits. Methods: Through the use of free Business Intelligence tools and Python data science language we designed a realtimemonitoring system, which was implemented to explore the Electronic Medical Records system of a university mentalhealth emergency unit and render an electronic dashboard to support health professional daily practice. Results: Three maindashboards were created to monitor patient waiting time, to access the clinical notes summary for the next waiting patient,and to obtain insights into activity during the last 24 hours. Conclusions: The designed system could serve as a monitoringsupport model using free and user-friendly data science tools, which are good alternatives to proprietary business intelligencesolutions and drastically reduce cost. Still, the key to success in decision-making systems is based on investment in humanresources, business intelligence skills training, the organizational aspect of the decision-making process, and data productionquality insurance.

Health-Related Quality of Life among Breast Cancer Patients and Influencing Factors in Morocco

El Fakir, Samira,El Rhazi, Karima,Zidouh, Ahmed,Bennani, Maria,Benider, Abdelatif,Errihani, Hassan,Mellass, Nawfel,Bekkali, Rachid,Nejjari, Chakib Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.12

Background: Breast cancer is the most common cancer among women in most countries of the world. It is ranked first in females in Morocco (accounting for 33.4% of the total cancer burden) and more than 60% of cases are diagnosed at stage III or IV. During the last decade, health-related quality of life (HRQOL) has become an important aspect of breast cancer treatment. The objective of this study was to describe self-reported HRQOL in patients with breast cancer and to investigate its associations with sociodemographic and clinical variables. Methods: A prospective study was carried out in the main oncology centers in Morocco. Quality of life was measured using the Moroccan Arabic versions of the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire C 30 (EORTC QLQ C30) and the Breast Cancer-Specific Quality of Life Questionnaire (EORTC QLQ-BR23). Statistical analyses were performed using descriptive statistics and multivariate analyses. Results: A total of 1463 subjects were included in the study, with a mean age of 55.6 (SD. 11.2) years, 70% being married. The majority had stage II (45.9%) and a few cases stage IV (12.9%) lesions. The participants' global health mean score was 68.5 and in "functional scales", social functioning scored the highest (Mean 86.2 (SD=22.7)). The most distressing symptom on the symptom scale was financial difficulties (Mean 63.2 (SD=38.2)). Using the disease specific tool, it was found that future perspective scored the lowest (Mean 40.5 (SD=37.3)). On the symptom scale, arm symptoms scored the highest (Mean 23.6 (SD=21.6)). Significant mean differences were noted for many functional and symptom scales. Conclusion: Our results emphasized that the general HRQOL for our study population is lower than for corresponding populations in other countries. This study provided baseline information on the quality of life for a large sample of Moroccan women diagnosed with breast cancer.

Breast Cancer Screening in Morocco: Performance Indicators During Two Years of an Organized Programme

Fakir, Samira El,Najdi, Adil,Khazraji, Youssef Chami,Bennani, Maria,Belakhel, Latifa,Abousselham, Loubna,Lyoussi, Badiaa,Bekkali, Rachid,Nejjari, Chakib Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.15

Background: Breast cancer is commonly diagnosed at late stages in countries with limited resources. In Morocco, breast cancer is ranked the first female cancer (36.1%) and screening methods could reduce the proportion presenting with a late diagnosis. Morocco is currently adopting a breast cancer screening program based on clinical examination at primary health facilities, diagnosis at secondary level and treatment at tertiary level. So far, there is no systematic information on the performance of the screening program for breast cancer in Morocco. The aim of this study was to analyze early performance indicators. Materials and Methods: A retrospective evaluative study conducted in Temara city. The target population was the entire female population aged between 45-70 years. The study was based on process and performance indicators collected at the individual level from the various health structures in Tamara between 2009 and 2011. Results: A total of 2,350 women participated in the screening program; the participation rate was 35.7%. Of these, 76.8% (1,806) were married and 5.2% (106) of this group had a family history of breast cancer. Of the women who attended screening, 9.3% (190) were found to have an abnormal physical examination findings. A total of 260 (12.7%) were referred for a specialist consultation. The positive predictive value of clinical breast examination versus mammography was 23.0%. Forty four (35.5%) of the lesions found on the mammograms were classified as BI-RADs 3; 4 or 5 category. Cancer was found in 4 (1.95%) of the total number of screened women and benign cases represented 0.58%. Conclusions: These first results of the programme are very encouraging, but there is a need to closely monitor performance and to improve programme procedures with the aim of increasing both the participation rate and the proportion of women eligible to attend screening.

Investigation of the structural and optical properties of sol gel processed Ho-doped BaTiO3 ceramics

Adil Moutaouaffiq,Ali Didi Seddik,Abdelilah Rjeb,Mohammed Naciri Bennani,Mohamed Naji,Salaheddine Sayouri 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.6

The pure BaTiO3 and Ho doped BaTiO3 (Ba1-xHoxTiO3 with x = 0, 0.25, 0.50, 0.75, 1, 1.5 and 2%), powders were preparedthrough the sol-gel process and structurally characterized by Thermogravimetric analysis (TGA), Differential thermal analysis(DTA), X-Ray diffraction (XRD), Fourier Transform Infrared (FT-IR) and Raman spectroscopy. The optical propertieshave been investigated using Ultraviolet-Visible (UV-Vis) transmittance-reflectance spectroscopy. X-ray diffraction (XRD). The results revealed that the prepared powders, calcined at 1000 °C for 4 hours, crystallized in the pure perovskite structurewithout the presence of secondary phases and showed a slight transition from the quadratic phase (pure BT) to the pseudo-cubic phase for the doped samples. From these results, we can also notice that Ho may occupy both Ba and Ti crystallographicsites. Raman and Fourier Transform Infrared (FT-IR) results are in accordance with those obtained from XRDcharacterizations. The values of the bandgap energies for the doped samples are lower than that of the pure BaTiO3 (3.26eV), thus confirming energy softening effect of Ho.

Monitoring Mental Healthcare Services Using Business Analytics

Samy Housbane,Adil Khoubila,Khaoula Ajbal,Zineb Serhier,Mohamed Agoub,Omar Battas,Mohamed Bennani Othmani 대한의료정보학회 2020 Healthcare Informatics Research Vol.26 No.2

Objectives: Monitoring healthcare activities is the first step for health stakeholders and health professionals to improve the quality and performance of healthcare services. However, monitoring remains a challenge for healthcare facilities, especially in developing countries. Fortunately, advances in business analytics address this need. This paper aims to describe the experience of a lowincome healthcare facility in a developing country in using business analytics descriptive techniques and to discuss business analytics implementation challenges and opportunities in such an environment. Methods: Business analytics descriptive techniques were applied on 3 years’ electronic medical records of outpatient consultation of the University Psychiatric Centre (CPU) of Casablanca. Statistical analysis was conducted to compare results over years. Results: Over the 3 monitored years, the monthly number of computerized physician order entries increased significantly (p < 0.001). Physicians improved their personal recording over years. Schizophrenia as well as depressive and bipolar disorders were noted at the top of outpatient mental disorders. Antipsychotics are the most prescribed drugs, and a significant annual decrease in outpatient care wait time was noted (p < 0.001). Conclusions: Business analytics allowed CPU to monitor mental healthcare outpatient activity and to adopt its business processes according to outcomes. However, challenges mainly in the organizational dimension of the decision-making process and the definition of strategic key metrics, data structuration, and the quality of data entry had to be considered for the optimal use of business analytics.