نتایج جستجو برای: IDF

تعداد نتایج: 3482  

Journal: :آب و خاک 0

the intensity – duration – frequency (idf) curves play most important role in the hydraulic design of structures. the traditional method to construct idf curves has a long estimation process and also has high number of parameters which this property reduces the reliability of idf curves. in the traditional method, rainfall in different durations should be available until the extraction of idf c...

Razi Khalaf, Saeed Soltani Koupai

The intensity –duration –frequency (IDF) curves play most important role in watershed management, flood control and hydraulic design of structures. Conventional method for calculating the IDF curves needs hourly rainfall data in different durations which is not extensively available in many regions. Instead 24-hour precipitation statistics were measured in most rain-gauge stations. In this stud...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده منابع طبیعی 1392

یکی از ابزارهای مهم در طراحی سازه های هیدرولیکی، مطالعات کنترل سیلاب و آبخیزداری رگبار طرح می باشد که از روی منحنی های شدت- مدت - فراوانی (idf) بارش برای دوام و دوره ی بازگشت معین استخراج می شود. در روش متداول محاسبه ی منحنی های idf باید بارش به ازای دوام های مختلف ثبت شده باشد تا استخراج این منحنی ها میسر گردد. این اطلاعات در ایستگاههای مجهز به باران سنج ثبات قابل دستیابی است. در بسیاری از منا...

2011
Qiaoyan Kuang Xiaoming Xu

Feature extraction is the important prerequisite of classifying text effectively and automatically. TF· IDF is widely used to express the text feature weight. But it has some problems. TF•IDF can’t reflect the distribution of terms in the text, and then can’t reflect the importance degree and the difference between categories. This paper proposes a new feature weighting method—TF•IDF•Ci to whic...

برزوئی, شیوا, حسین پناه, فرهاد, عزیزی, فریدون,

مقدمه: هدف از مطالعه‌ی حاضر بررسی دقت تشخیصی تعریف‌‌های سندرم متابولیک طبق معیار‌های Modified ATP III و IDF در شناسایی افراد مبتلا به مقاومت به انسولین و ارزیابی میزان توافق بین این تعریف‌‌ها و مقاومت به انسولین است. مواد و روش‌ها: نمونه‌‌ها شامل 347 فرد غیردیابتی از مطالعه‌ی قند و لیپید تهران (140 مرد و 207 زن) با سن 84-21 سال بودند. مرجع استاندارد مقاومت به انسولین، HOMA-IR بود و مقاومت به ان...

2016
Joeran Beel Corinna Breitinger Stefan Langer

In the domain of academic search engines and research-paper recommender systems, CC-IDF is a common citation-weighting scheme that is used to calculate semantic relatedness between documents. CC-IDF adopts the principles of the popular term-weighting scheme TF-IDF and assumes that if a rare academic citation is shared by two documents then this occurrence should receive a higher weight than if ...

2012
Thierry Gombet Benjamin Longo-Mbenza Bertrand Ellenga-Mbolla Meo Stephane Ikama Etienne Mokondjimobe Gisele Kimbally-Kaky Jean-Louis Nkoua

BACKGROUND The objective of this study was to compare four different criteria for diagnosing metabolic syndrome (MS) and to correlate sociodemographic data, liver enzymes, lipids, inflammation, and insulin resistance with MS definitions. METHODS This cross-sectional study included a random number of 126 African bank employees from Brazzaville, Congo. RESULTS THE PREVALENCE OF MS VARIED ACCO...

2009
Valérie Failla Odile Wauters Nazli Nikkels-Tassoudji Alain Carlier Josette André Arjen F Nikkels

Infantile digital fibromatosis (IDF) is a rare benign fibroproliferative tumor of early childhood. IDF preferentially affects the fingers and the toes. Malignant transformation or metastases have never been reported. Surgical treatment has been advocated previously but local recurrences were observed frequently. Recent literature supports clinical surveillance without any medical or surgical in...

2013
Frederik Hogenboom Michel Capelle Marnix Moerland

Traditionally, content-based news recommendation is performed by means of the cosine similarity and the TF-IDF weighting scheme for terms occurring in news messages and user profiles. Semanticsdriven variants like SF-IDF additionally take into account term meaning by exploiting synsets from semantic lexicons. However, semantics-based weighting techniques are not able to handle – often crucial –...

2015
Guclu Aykut Gerke Veenstra Claudia Scorcella Can Ince Christiaan Boerma

BACKGROUND Orthogonal polarized spectral (OPS) and sidestream dark field (SDF) imaging video microscope devices were introduced for observation of the microcirculation but, due to technical limitations, have remained as research tools. Recently, a novel handheld microscope based on incident dark field illumination (IDF) has been introduced for clinical use. The Cytocam-IDF imaging device consis...

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