نتایج جستجو برای: مدل جابهجایی مارکف msm

تعداد نتایج: 124538  

2016
Huachun Zou Junjie Xu Qinghai Hu Yanqiu Yu Gengfeng Fu Zhe Wang Lin Lu Minghua Zhuang Xi Chen Jihua Fu Zhenhai Zhou Wenqing Geng Yongjun Jiang Hong Shang

INTRODUCTION Literature on the age at first anal intercourse (AFAI) among men who have sex with men (MSM) is limited. We aimed to elucidate the evolution of AFAI and the factors associated with early AFAI, based on a large sample of MSM in China. METHODS We collected information on the demographics and sexual behaviours of MSM from seven large cities in China from 2012 to 2013. Blood samples ...

2014
Eric P F Chow Joseph T F Lau Xun Zhuang Xiaohu Zhang Yanjie Wang Lei Zhang

PURPOSE OF REVIEW Numerous studies reported the rapid spread of HIV/AIDS epidemic among men who have sex with men (MSM) in China. This paper aims to investigate the overall epidemic trend and associated high-risk behaviours among Chinese MSM and to explore the governmental and community responses to the epidemic. RECENT FINDINGS HIV prevalence among Chinese MSM increased rapidly in all Chines...

Journal: :Lancet 2012
Chris Beyrer Stefan D Baral Frits van Griensven Steven M Goodreau Suwat Chariyalertsak Andrea L Wirtz Ron Brookmeyer

Epidemics of HIV in men who have sex with men (MSM) continue to expand in most countries. We sought to understand the epidemiological drivers of the global epidemic in MSM and why it continues unabated. We did a comprehensive review of available data for HIV prevalence, incidence, risk factors, and the molecular epidemiology of HIV in MSM from 2007 to 2011, and modelled the dynamics of HIV tran...

ژورنال: مجله علوم آماری 2011

در این مقاله، با استفاده از احتمال های تغییر وضعیت m-دوره بعد زنجیر مارکف، احتمال تغییر وضعیت رفتار نوسان های در این مقاله روشی برای برآورد احتمال تغییر وضعیت سری های زمانی مالی توسط مدل اتورگرسیو تبدلی مارکوف پیشنهاد شده است. سپس با استفاده از این مدل، رفتار نوسان های نرخ ارز به دو رژیم نرخ تغییرات کم و زیاد مدل بندی شده است. نتایج پیش بینی نشان می دهد که احتمال ماندگاری در رژیم ها رو به کاهش...

Journal: :International Journal of Infectious Diseases 2021

IntroductionOutbreaks of invasive meningococcal disease (IMD) among men who have sex with (MSM) caused by a hypervirulent, non-encapsulated Neisseria meningitidis (Nm) clone belonging to genogroup C been described. We aimed determine the oral and anal carriage rates genogroups Nm MSM living HIV.MethodsSexually active HIV were included. A questionnaire, an wash sample swab collected at baseline ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه الزهراء - دانشکده علوم اجتماعی و اقتصادی 1391

در این پایان نامه از مدل فضا- حالت و مارکف سوئیچینگ برای بررسی حباب قیمتی در بورس اوراق بهادار تهران استفاده شده است. بیان مدل ارزش حال در قالب مدل فضای حالت و افزودن دو رژیم مارکف (رژیم 1(تشکیل حباب) و رژیم 2(ترکیدن حباب)) به آن، این امکان را فراهم می آورد تا علاوه بر بررسی وجود حباب قیمتی در بورس اوراق بهادار تهران، مرحله عمر آن را نیز تشخیص دهیم. نتایج آزمون، فرضیه اصلی تحقیق مبنی بر عدم وجو...

Journal: :Sexually transmitted diseases 2012
Marlies Heiligenberg Paulien R Wermeling Martijn S van Rooijen Anouk T Urbanus Arjen G C L Speksnijder Titia Heijman Maria Prins Roel A Coutinho Maarten F Schim van der Loeff

BACKGROUND Recreational drug use is associated with high-risk sexual behavior and sexually transmitted infections (STIs). We assessed the prevalence of drug use during sex and the associations between such use and STI (chlamydia, gonorrhea, or syphilis). METHODS During 3 periods in 2008 and 2009, attendees of an STI clinic in Amsterdam were interviewed about sexual behavior and drug use durin...

2017
Mariette R. Marano Renee Stein Weston O. Williams Guoshen Wang Songli Xu Gary Uhl Qi Cheng Catherine N. Rasberry

OBJECTIVES To describe the extent to which Centers for Disease Control and Prevention (CDC)-funded HIV testing in nonhealthcare facilities reaches adolescent MSM, identifies new HIV infections, and links those newly diagnosed to medical care. METHODS/DESIGN We describe HIV testing, newly diagnosed positivity, and linkage to medical care for adolescent MSM who received a CDC-funded HIV test in...

2016
Lin Qu Wenrui Wang Yongming Gao Jingyuan Yang Jijiang Dai Dawei Wang Bo Tao

BACKGROUND Little research has been conducted on the human immunodeficiency virus (HIV) epidemic and the sexual intercourse habits of men who have sex with men (MSM) in crowded places, both locally and abroad. This study conducted a survey of MSM in different locales of Inner Mongolia to provide a reference for developing strategies or measures to prevent and control HIV among this understudied...

2017
Laura Nic Lochlainn Kate O’Donnell Caroline Hurley Fiona Lyons Derval Igoe

In Ireland, men who have sex with men (MSM) have increased HIV risk. Pre-exposure prophylaxis (PrEP), combined with safe sex practices, can reduce HIV acquisition. We estimated MSM numbers likely to present for PrEP by applying French PrEP criteria to Irish MSM behavioural survey data. We adjusted for survey bias, calculated proportions accessing testing services and those likely to take PrEP. ...

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