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Satellite Attitude Identification and Prediction Based on Neural Network Compensation

Space(Science & Technology) 2023年第1期3卷 71-79页

作者： Zibin Sun jules simo Shengping Gong School of Aerospace Engineering Tsinghua UniversityBeijing 100084China School of Engineering University of Central LancashirePreston PR11XJUK School of Astronuatics Beihang UniversityBeijing 102206China

This paper proposed a new attitude determination method for low-orbit *** attitude prediction accuracy is greatly improved by adding the unmodeled environmental torque to the dynamic ***,the environmental torque extraction algorithm based on extended Kalman filter and series extended state observer is introduced,and the unmodeled part of dynamic is identified through the inverse dynamic ***,the collected data are analyzed and trained by a backpropagation neural network,resulting in an attitude-torque mapping network with compensation *** simulation results show that the proposed feedback attitude prediction algorithm can outperform standard methods and provide a high accurate picture of prediction and reliability with discontinuous measurement.

关键词： prediction network algorithm

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A new solar sail orbit

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Science China(Technological Sciences) 2012年第3期55卷 848-855页

作者： GONG ShengPing LI JunFeng BAOYIN HeXi simo jules School ofAerospace Tsinghua UniversityBeijing 100084China State Key Laboratory of Astronautical Dynamics Xi'an Satellite Control CenterXi'an 710043China Advanced Space Concepts Laboratory Department of Mechanical EngineeringUniversity of StrathclydeGlasgow G11X JUnited Kingdom

Solar sail is used to achieve a geocentric sun-synchronous frozen *** kind of orbit combines the characteristics of both sun-synchronous orbits and frozen ***,the impossible orbits for a typical spacecraft such as sun-synchronous orbits whose inclination is less than 90° are also possible for solar *** achieve a sun-synchronous frozen orbit,the characteristic acceleration of the sail is chosen *** addition,the attitude of the sail is adjusted to keep the sun-synchronous and frozen *** perturbations including atmosphere drag,third-body gravitational forces and shaded regions are discussed,where the atmosphere drag is cancelled by solar radiation pressure force,third-body gravitational forces have negligible effects on the orbit and the shaded region can be avoided by choosing the classical orbit elements of the *** last,a numerical example is employed to validate the sun-synchronous frozen characteristics of the sail.

关键词： solar sail sun-synchronous orbit frozen orbit

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Seroprevalence of <i>Brucella</i>Antibodies and Risk Factors Associated with Human Brucellosis in High-Risk Occupational Groups of the Noun Division in the West Region of Cameroon

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Journal of Biosciences and Medicines 2021年第3期9卷 105-123页

作者： Rolin Mitterran Ndefo Kamga Barberine Silatsa Assongo Eugenie Melaine Kemta Magang Amadou Fouapon Moussa Salihou jules-Roger Kuiate Gustave simo Molecular Parasitology & Entomology Unit Department of Biochemistry Faculty of Science University of Dschang Dschang Cameroon Divisional Delegation of Livestock Fisheries and Animal Industries Noun Cameroon Laboratory of Microbiology and Antimicrobial Substances Department of Biochemistry Faculty of Sciences University of Dschang Dschang Cameroon

Brucellosis is an anthropozoonotic disease with an important public health impact. Although the transmission of Brucella from animals to humans can occur in different epidemiological settings of sub-Saharan African countries, little data has been published on human brucellosis. This study aimed to detect Brucella antibodies and the risk factors associated to brucellosis among high-risk occupational groups of people in the Noun Division of Cameroon. For this study, a structured questionnaire was used to assess risk factors associated with human brucellosis. Thereafter, blood samples were collected from high-risk occupational groups of people in four villages. Plasma was extracted from each sample and Brucella antibodies were detected using Rose Bengal Plate Test (RBPT) and indirect Enzyme-Linked Immunosorbent Assay (i-ELISA). Of the 273 participants enrolled, the overall seroprevalence of Brucella antibodies was 12.45% with RBPT and 10.26% with i-ELISA test. This seroprevalence was significantly (P = 0.04;X2 = 9.73) higher among livestock herdsmen (15.8%), slaughterhouse workers (9.8%), butchers (4.8%), participants having no educational level (14.3%) and those experiencing above 5 years of risky activity (15%). Raw milk consumption (OR: 4.8;P = 0.001), no formal education (OR: 6.4;P = 0.03) and assistance of animal during parturition (OR: 7.2;P Brucella infections. The detection of Brucella antibodies indicates the risk of human brucellosis in some groups of people of the Noun division. Consuming unpasteurized milk, participating in parturition and lacking knowledge on brucellosis appeared as risk factors associated with human brucellosis in western Cameroon. It raises the need of developing and implementing control measures for human and animal brucellosis.

关键词： Brucellosis Risk Factors High-Risk Occupational Groups Cameroon

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Epidemiological and Histological Profile of Cervical Cancer in Cameroon: About 2078 Cases

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Open Journal of Obstetrics and Gynecology 2016年第4期6卷 232-239页

作者： Engbang Ndamba Jean Paul Tchente Nguefack Charlotte Owona Manga Léon jules simo Godefroy Essam Sime Jean Daniel Elono Fouda Andrée Michelle Essame Oyono Jean Louis Hasigov Alan Faculty of Medicine and Pharmaceutical Sciences The University of Douala Douala Cameroon Laquintinie Hospital of Douala Douala Cameroon North-Ossetian State Medical Academy Vladikavkaz Russia Douala General Hospital Douala Cameroon Bio-Medical and Cancer Center of Bafoussam Bafoussam Cameroon Maroua Regional Hospital Maroua Cameroon Faculty of Medicine and Biomedical Sciences The University of Yaoundé I Yaoundé Cameroon Yaounde University Health Center Yaoundé Cameroon

Objective: To describe the epidemiological and histological aspects of cervical cancer in Cameroon. Materials and Methods: It was a descriptive retrospective study carried out over a period of 10 years (2005-2014), on malignant tumors of the cervix observed at the laboratory of Anatomic Pathology in four regions (Center, Littoral, West, South-west). The studied parameters were frequency, age, sex, localization, histological type and the immuno-histochemical aspects. Results: A total of 2078 cases with an annual frequency of 20.78 cases were registered;the peak was reached in 2010 with 304 cases (14.62%). Cervical cancer was the main genital cancer affecting women with a percentage of 82.26%. The average age of the patients was 52.33 ± 12. 80 years old, with extremes from 22 to 93 years old. The age group from 40 to 59 had more than half of the cases, with 1094 cases (52.65%). The major histological types recorded were squamous cell cancer with 1687 cases (81.51%) and adenocarcinoma with 269 cases (12.95%). Conclusion: Cervical cancer is the chief genital cancer affecting female genital organs. The predominant histological types are squamous cell cancers.

关键词： Cancer Cervix Epidemiology Histopathology Cameroon

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