نتایج جستجو برای: effective algorithms

تعداد نتایج: 989589  

Abstract: JPEG is the most applicable image format in digital communication. In recent years, various steganography methods have been proposed for it. This paper aims to study and classify JPEG steganography schemes and introduce different methods to improve their security based on cover. Accordingly, the effective factors in security that are related to the cover such as double compression, sp...

J. C. Liang, L. J. Li, N. He,

A multi-objective heuristic particle swarm optimiser (MOHPSO) based on Pareto multi-objective theory is proposed to solve multi-objective optimality problems. The optimality objectives are the roof displacement and structure weight. Two types of structure are analysed in this paper, a truss structure and a framework structure. Performance-based seismic analysis, such as classical and modal push...

Journal: :مدیریت آب و آبیاری 0
قاسم میرزائی کارشناس ارشد سازه های آبی، دانشکدۀ کشاورزی، دانشگاه تربیت مدرس، تهران، ایران جمال محمد ولی سامانی استاد گروه مهندسی سازه های آبی، دانشکدۀ کشاورزی، دانشگاه تربیت مدرس، تهران، ایران مهدی مظاهری استادیار گروه مهندسی سازه های آبی، دانشکدۀ کشاورزی، دانشگاه تربیت مدرس، تهران، ایران

flood flow importance enforces we to simulate its components exactly. in this study, saint-venant equations in conservative form are usedto simulate one-dimensional rapidly varied flow in the river. upstream methods of godunov family in finite volume frame work are used to numerical solution. according to flow conditions in the river, the equations used are included in the source term of the be...

Journal: :global analysis and discrete mathematics 0
zahra khorsand islamic azad university, damghan branch, damghan, iran reza mortazavi school of engineering, damghan university, damghan, iran

with the rapid expansion of the information on the internet, recommender systems play an important role in terms of trade and research. recommender systems try to guess the user's way of thinking, using the in-formation of user's behavior or similar users and their views, to discover and then propose a product which is the most appropriate and closest product of user's interest. ...

Journal: :مدیریت فناوری اطلاعات 0
عادل آذر دانشگاه تربیت مدرس پرویز احمدی دانشگاه تربیت مدرس محمد وحید سبط دانشگاه تربیت مدرس

the success or failure of an organization has a direct relationship with how its human resources are employed and retained. it is the case that organizations keep large amounts of information and data on entrance evaluations and processes. this information, however, is often left unutilized. data mining is considered a solution for analyzing these data. this paper is investigating educated and ...

Journal: :trauma monthly 0
reza alizadeh trauma research center, baqiyatallah university of medical sciences. postal code19945/581. mollasadra st, ir iran +98-2188053776, [email protected]; department of ophthalmology, khatam-al-anbia eye hospital , faculty of medicine, mashhad university of medical sciences, ir iran farzad panahi trauma research center, baqiyatallah university of medical sciences. postal code19945/581. mollasadra st, ir iran +98-2188053776, [email protected] masoud saghafinia trauma research center, baqiyatallah university of medical sciences. postal code19945/581. mollasadra st, ir iran +98-2188053776, [email protected]; trauma research center, baqiyatallah university of medical sciences. postal code19945/581. mollasadra st, ir iran +98-2188053776, [email protected] keivan alizadeh trauma research center, baqiyatallah university of medical sciences. postal code19945/581. mollasadra st, ir iran +98-2188053776, [email protected]; department of interventional cardiology, rajaee heart hospital, tehran university of medical sciences, ir iran neusha barakati faculty of medicine, mashhad university of medical sciences, ir iran mohammad khaje-daloee department of epidemiology and statistics, faculty of medicine, mashhad university of medical sciences, ir iran

background trauma still stands atop of the list of emergencies. transfer of these patients via emergency medical services (ems) dispatch is critical with regard to importance of timing. this aspect has achieved greater importance due to population increase and telephone triage. objectives we aimed to decrease unnecessary emergency medical services (ems) missions via a computer program designed ...

Journal: :iranian journal of cancer prevention 0
hajar moradmand dept. of biomedical radiation engineering, amirkabir university of technology, tehran, iran saeed setayeshi dept. of biomedical radiation engineering, amirkabir university of technology, tehran, iran ali reza karimian dept. of biomedical engineering, faculty of engineering, university of isfahan, isfahan, iran mehri sirous isfahan university of medical sciences, isfahan, iran mohammad esmaeil akbari cancer research center, shahid beheshti university of medical sciences, tehran, iran

background: mammography is the primary imaging technique for detection and diagnosis of breast cancer; however, the contrast of a mammogram image is often poor, especially for dense and glandular tissues. in these cases the radiologist may miss some diagnostically important microcalcifications. in order to improve diagnosis of cancer correctly, image enhancement technology is often used to enha...

Introduction: Since the delay or mistake in the diagnosis of mood disorders due to the similarity of their symptoms hinders effective treatment, this study aimed to accurately diagnose mood disorders including psychosis, autism, personality disorder, bipolar, depression, and schizophrenia, through modeling and analyzing patients' data. Method: Data collected in this applied developmental resear...

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