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Implementing uterine balloon tamponade(UBT)device for immediate postpartum hemorrhage management:Leveraging resource allocation and highlighting noteworthy experiences

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Gynecology and Obstetrics Clinical Medicine 2023年第3期3卷 175-180页

作者： mian dehi boston Guie Privat Apollinaire Horo Aka Edele Kouakou Konan Virginie Aholoupke Bruno KonéSeydou Rochon Sarah Boni Serge Burke Thomas F Felix Houphouet Boigny University Cote d’Ivoire Division of Global Health and Human Rights Department of Emergency MedicineCote d’Ivoire National Mother and Child Health Program Côte d'Ivoire Cote d’Ivoire Massachusetts General Hospital Division of Global Health and Human Rights BostonMAUSA Harvard T.H.Chan School of Public Health BostonMAUSA Harvard Medical School BostonMAUSA

Background The use of uterine balloon tamponade(UBT)devices for intrauterine packing and management of vaginal bleeding by uterine atony has shown promising results in improving the quality of care and reducing maternal *** This report aims to provide an overview of progress made in implementing UBT devices in northern Cote d'*** and methods A four-year retrospective study was conducted in the North-East(163,645),North-Center(351,909),and North-West(57,983).In 2017,UBT was adopted by members of the healthcare ***,5 national and 32 regional trainers have been *** training session was a theoretical and practical program with a low *** is a male condom tied to a urinary catheter,filled with *** outcomes included stopping bleeding,avoiding the need for surgery,and preventing maternal deaths(MD).In 2018,3,515 UBT devices were *** 2019,monitoring tools and transmission circuits of the data were *** 2020,the collection of data and local manufacturing was *** During the process,978 health workers,mainly midwife(52.0%)and nurses(32.2%)out of the 1,295 assigned were *** number of trained individuals decreased from 209 in 2019 to 160 in 2020.A total of 1,715 UBT devices were locally manufactured,adding to the existing gift of 5,080 devices,with total availability of 6,*** distribution of devices increased from 2017 to 2019 but decreased in *** rates increased from 87.3%in 2017(365/418)to 95.0%in 2019(556/585)and slightly decreased in 2020 to 98.0%(681/695).Adverse outcomes(144/2,193),included MD(35/2,193)and medical evacuation to the surgical center(109/2,193).Conclusion The implementation of UBT in northern Cote d'Ivoire successfully reduced maternal death rates caused by immediate post-partum hemorrhage(IPPH).However,to ensure sustainability,further improvements are needed,including increased monitoring,ongoing training,and device availability.

关键词： Implementation Uterine balloon tamponade Post-partum hemorrhage Health providers Health regions

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Management of Giant Ano-Vulvar Condyloma in a Structure with Limited Resources

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Open Journal of Obstetrics and Gynecology 2017年第11期7卷 1124-1131页

作者： mian dehi boston Dia Jean Marc Djanhan Lydie N’Guessan Koffi Guié Privat Abauleth Yao Raphael Kouakou Firmin Boni Serges Department of Gynecology and Obstetrics University and Hospital Center of Cocody (CHUC) Abidjan Cote d’Ivoire Department of Gynecology and Obstetrics University and Hospital Center of Treichville (CHUT) Abidjan Cote d’Ivoire Department of Gynecology and Obstetrics University and Hospital Center of Bouaké (CHUB) Bouaké Cote d’Ivoire

Buschke-Lowenstein Tumor (BLT) or Giant Acuminate Condyloma (GAC) is an uncommon clinical entity rarely published in Cote d’Ivoire and Africa. It is a viral infection with increasing sexual transmission due to the resurgence of HIV infection. This observation is the first case recorded in our service in three decades. The treatment is resolutely surgical, in our context of sub-medicalization, in the absence of other therapeutic means. Most of the time the progression is favorable, but the prognosis can be aggravated by the HIV coinfection. Through this observation, the authors insist on the prevention of all sexually transmitted infections, particularly, with HPV and HIV, by sexual education (abstinence, fidelity, port of condom) and the systematic vaccination before any sexual activity.

关键词： Giant Ano-Vulvar Condyloma HIV HPV

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MDCFS: few-shot object detection with multilevel decoupled classifiers

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Optoelectronics Letters 2025年

作者： LI Chuanhui ZHOU mian FENG Zhikun SUI Zezhou GAO Zhan School of Computer Science and Engineering， Tianjin University of Technology

Few-shot object detection poses unique challenges as it requires effectively learning novel classes with limited labeled data. Current approaches often suffer from biases towards base classes during fine-tuning， leading to suboptimal performance on detecting novel classes. Additionally， in complex scenes， the confusion between foreground and background objects further affects the accuracy and robustness of the model. To address these issues， we propose the Multilevel Decoupling Classification Few-Shot Algorithm (MDCFS). we decouple the standard classifier into a parallel foreground classifier and a background classifier in the Few-Shot Object Detection (FSOD) setting. This decoupling enables the independent separation of positive samples from noisy negative samples， alleviating the foreground-background confusion problem commonly encountered in few-shot detectors. For Generalized Few-Shot Object Detection (G-FSOD)， where the few-shot dataset contains base classes， we further decouple the foreground classification head into a base class classification head and a novel class classification head. To ensure balance， we assign more weight to the novel class classification head， effectively addressing the bias towards base classes. Furthermore， we optimize the initial weights of the few-shot fine-tuning stage， significantly reducing training time and mitigating catastrophic forgetting in G-FSOD. Additionally， we incorporate metric learning into our model with minimal cost. Experimental results demonstrate the effectiveness of our approach. Compared to state-of-the-art few-shot object detection methods based on fine-tuning， MDCFS achieves performance improvements of up to 6.3% on the PASCAL VOC dataset and 1.5% on the COCO dataset.

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Modeling and Backstepping-based Nonlinear Control Strategy for a 6 DOF Quadrotor Helicopter

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Chinese Journal of Aeronautics 2008年第3期21卷 261-268页

作者： Ashfaq Ahmad mian China Nanjing 210016 College of Automation Engineering Nanjing University of Aeronautics and Astronautics

In this article,a nonlinear model of an underactuated six degrees of freedom (6 DOF) quadrotor helicopter is derived on the basis of the Newton-Euler formalism. The derivation comprises determining equations of the motion of the quadrotor in three dimensions and approximating the actuation forces through the modeling of aerodynamic coefficients and electric motor dynamics. The derived model composed of translational and rotational subsystems is dynamically unstable,so a sequential nonlinear control strategy is used. The con-trol strategy includes feedback linearization coupled with a PD controller for the translational subsystem and a backstepping-based PID nonlinear controller for the rotational subsystem of the quadrotor. The performances of the nonlinear control method are evaluated by nonlinear simulation and the results demonstrate the effectiveness of the proposed control strategy for the quadrotor helicopter in quasi-stationary flights.

关键词： underactuated systems quadrotor helicopter backstepping control

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Dynamic modeling and nonlinear control strategy for an underactuated quad rotor rotorcraft

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第4期9卷 539-545页

作者： Ashfaq Ahmad mian College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

In this paper, a nonlinear dynamic MIMO model of a 6-DOF underactuated quad rotor rotorcraft is derived based on Newton-Euler formalism. The derivation comprises determining equations of motion of the quad rotor in three dimensions and seeking to approximate the actuation forces through modeling of the aerodynamic coefficients and electric motor dynamics. The derived model is dynamically unstable, so a sequential nonlinear control strategy is implemented for the quad rotor. The control strategy includes exact feedback linearization technique, using the geometric methods of nonlinear control. The performance of the nonlinear control algorithm is evaluated using simulation and the results show the effectiveness of the proposed control strategy for the quad rotor rotorcraft near quasi-stationary flight.

关键词： Quad rotor rotorcraft MIMO model Underactuated systems

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Comparison of the dynamic response of a saturated soil between two models

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Science China Earth Sciences 2004年第6期47卷 551-558页

作者： LIN mian Institute of Mechanics Chinese Academy of SciencesBeijing100080China

By comparing the dynamic responses of saturated soil to Biots and Yamamotos models, the properties of the two models have be pointed out. First of all, an analysis has been made for energy loss of each model from the basic equations. Then the damping of elastic waves in coarse sand and fine sand with loading frequency and soils parameters have been calculated and the representation of viscous friction and Coulomb friction in the two models has been con-cluded. Finally, the variations of loading wave damping and stress phase angles with water depth and soils parameters have been obtained as loading waves range in ocean waves.

关键词： models of marine sediment, elastic waves, phase angles of stress field.

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基于RHT本构模型的连续装药预裂爆破孔距优化研究

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高压物理学报 2025年第1期39卷 109-118页

作者：张伟王建国王勉陶家龙昆明理工大学国土资源工程学院云南昆明650093 云南省教育厅爆破新技术工程研究中心云南昆明650093

为解决北衙金矿在使用预裂爆破技术时整体爆破效果不佳的问题,基于RHT损伤本构模型,利用ANSYS/LS-DYNA数值模拟软件,开展了不同孔距下预裂爆破的数值模拟研究。结果表明:当预裂孔炮孔间距为120 cm时,孔间裂纹存在较为明显的分叉,且裂纹... 详细信息

为解决北衙金矿在使用预裂爆破技术时整体爆破效果不佳的问题,基于RHT损伤本构模型,利用ANSYS/LS-DYNA数值模拟软件,开展了不同孔距下预裂爆破的数值模拟研究。结果表明:当预裂孔炮孔间距为120 cm时,孔间裂纹存在较为明显的分叉,且裂纹扩展范围较大;当炮孔间距为130 cm时,裂纹向四周扩展的范围减小,且炮孔周围岩石的损伤程度明显降低;当炮孔间距增加至140 cm时,相邻预裂孔连线上的裂纹仅在局部连通,无法实现孔间贯穿。上述结果说明,130 cm的炮孔间距在降低预裂爆破自身对岩体的扰动与实现有效爆破成缝之间达到了平衡。基于数值模拟试验结果开展了现场试验,爆破效果良好。研究结果可为矿山的预裂爆破设计和施工提供参考。

关键词：预裂爆破连续装药孔距优化 RHT本构模型

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Invariant properties of representations under cleft extensions

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Science China Mathematics 2007年第1期50卷 121-131页

作者： Fang LI mian-mian ZHANG Department of Mathematics Zhejiang UniversityHangzhou310027China

The main aim of this paper is to give the invariant properties of representations of algebras under cleft extensions over a semisimple Hopf algebra. Firstly, we explain the concept of the cleft extension and give a relation between the cleft extension and the crossed product which is the approach we depend upon. Then, by making use of them, we prove that over an algebraically closed field k, for a finite dimensional Hopf algebra H which is semisimple as well as its dual H*, the representation type of an algebra is an invariant property under a finite dimensional H-cleft extension . In the other part, we still show that over an arbitrary field k, the Nakayama property of a k-algebra is also an invariant property under an H -cleft extension when the radical of the algebra is H-stable.

关键词： cleft extensions crossed product Nakayama algebra representation type 16G60 16W30 16S40

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Excitation and detection of coherent sub-terahertz magnons in ferromagnetic and antiferromagnetic heterostructures

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npj Computational Materials 2022年第1期8卷 1606-1614页

作者： Shihao Zhuang Jia-mian Hu Department of Materials Science and Engineering University of Wisconsin-MadisonMadisonWI53706USA

Excitation of coherent high-frequency magnons(quanta of spin waves)is critical to the development of high-speed magnonic *** we computationally demonstrate the excitation of coherent sub-terahertz(THz)magnons in ferromagnetic(FM)and antiferromagnetic(AFM)thin films by a photoinduced picosecond acoustic *** calculations are also performed to reveal the magnon excitation *** spin pumping and spin-charge conversion,these magnons can inject sub-THz charge current into an adjacent heavy-metal film which in turn emits electromagnetic(EM)*** a dynamical phase-field model that considers the coupled dynamics of acoustic waves,spin waves,and EM waves,we show that the emitted EM wave retains the spectral information of all the sub-THz magnon modes and has a sufficiently large amplitude for near-field *** predictions indicate that the excitation and detection of sub-THz magnons can be realized in rationally designed FM or AFM thin-film heterostructures via ultrafast optical-pump THz-emission-probe spectroscopy.

关键词： pumping pump coherent

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Saturated super-twisting sliding mode missile guidance

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Chinese Journal of Aeronautics 2022年第10期35卷 292-300页

作者： mian GONG Di ZHOU Xinguang ZOU School of Astronautics Harbin Institute of TechnologyHarbin 150001China School of Electronics and Information Engineering Harbin Institute of TechnologyHarbin 150001China

This paper concentrates on developing a missile terminal guidance law against a highly maneuvering target whose maneuvering acceleration is very close to that of the missile or even exceeds the missile normal acceleration in a finite period of time.A new saturated super-twisting algorithm is proposed and applied to the design of missile guidance *** proposed algorithm has the advantages of simple structure,easy parameter tuning rules and a full utilization of the limit control *** designed saturated super-twisting sliding mode guidance law is then employed in a missile guidance *** and its superior performance against strong maneuvering targets is demonstrated.

关键词： Highly maneuvering target Input saturation Missile guidance control Robust control Sliding mode control Super-twisting algorithm

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