نتایج جستجو برای: دقت تخمین doa
تعداد نتایج: 45556 فیلتر نتایج به سال:
سابقه و هدف: تخمین سونوگرافیک وزن جنین، به طور وسیعی در تصمیم گیری های بالینی مورد استفاده قرار می گیرد. فرمولهای ریاضی زیادی برای تخمین وزن مورد استفاده قرار می گیرد و از پارامترهای متنوعی جهت این کار استفاده می کنند. یکی از رایج ترین فرمول هایی که استفاده می شود فرمول هدلاک (hadlock) است که گفته می شود اواخر سه ماهه سوم بارداری دارای دقت زیادی است. ولی در پژوهش های مختلف دقت آن بسیار متفاوت گ...
The purpose of this study was to assess changes in exit velocity (EV) of Brahman calves from 21 d of age (DOA) to 56 d postweaning (231.30 ± 1.23 DOA). Spring-born calves (n = 308) from 2006 to 2008 were sired by 18 bulls. Exit velocity (m/s) was determined as the rate of speed of a calf traversing 1.83 m after being released from a working chute. Temperament score was determined as the average...
This letter proposes a multiple parametric dictionary learning algorithm for direction of arrival (DOA) estimation in presence of array gain-phase error and mutual coupling. It jointly solves both the DOA estimation and array imperfection problems to yield a robust DOA estimation in presence of array imperfection errors and off-grid. In the proposed method, a multiple parametric dictionary lear...
SUMMARY To avoid misinterpretation and mismanagement clinicians should be aware of the interference of new direct oral anticoagulants (DOA) on coagulation assays. A variety of oral anticoagulants targeting specific coagulation factors has already entered the market, and new indications for DOA will be released each year over the next few years. Due to their heterogeneous mode of action and diff...
Accurate information acquisition is of vital importance for wireless sensor array network (WSAN) direction of arrival (DOA) estimation. However, due to the lossy nature of low-power wireless links, data loss, especially block data loss induced by adopting a large packet size, has a catastrophic effect on DOA estimation performance in WSAN. In this paper, we propose a double-layer compressive se...
Direction-of-Arrival (DOA) defines the estimation of arrival angles of an electromagnetic wave impinging on a set of sensors. For dispersive and time-varying HF channels, where the propagating wave also suffers from the multipath phenomena, estimation of DOA is a very challenging problem. Multipath Separation-Direction of Arrival (MS-DOA), that is developed to estimate both the arrival angles i...
BACKGROUND This study assessed the characteristics of dead on arrival (DOA) patients in Pakistan. METHODS Data about the DOA patients were extracted from Pakistan National Emergency Department Surveillance study (Pak-NEDS). This study recruited all ED patients presenting to seven tertiary care hospitals during a four-month period between November 2010 and March 2011. This study included patie...
In this paper, a high-resolution direction-of-arrival (DOA) estimation algorithm is proposed for highly correlated signals. This algorithm is divided into two stages. In Stage 1, a high-resolution method of DOA estimation using an oblique projection operator was applied to estimate the DOA of highly correlated signals. In Stage 2, because estimations obtained in highly correlated signal environ...
ANGULAR SIGNAL DISTRIBUTION AND CROSS-POLARIZATION POWER RATIO SEEN BY A MOBILE RECEIVER AT 2.15 GHz
In mobile radio reception, signals typically arrive at the receiver antenna from a wide range of directions due to multipath propagation. This can be described by a direction-of-arrival (DoA) distribution of the propagation environment. If the DoA distribution is known, the Doppler spectrum and the autocorrelation function can be directly computed [1]. Furthermore, handset antenna performance c...
In April I965, anti-Doa, an antibody defining a 'new' red cell antigen, was reported (Swanson, Polesky, Tippett, and Sanger, I965). The present paper records the results of tests with anti-Doa on samples received in this unit from October I964 until April I966. Anti-Doa reacts best by the antiglobulin test on papainized cells, but only a minority of otherwise good antiglobulin sera are suitable...
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