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WOS Kategorileri : SCI-Exp ✕Koleksiyon : Fakülteler ✕
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FakültelerNuh Naci Yazgan Üniversitesi Kurum Koleksiyonu
Erişime Açık

A multiseries stochastic model for synthetic monthly flows

Tefaruk HAKTANIR

A new multiseries stochastic model is developed that takes n-year-long monthly stream flows observed at as many as 20 stations in a group and computes N-year-long synthetic monthly flows for up to 10 000 years. Initially, any series that exhibit trends with a 99% confidence level are detrended. The monthly flows of each observed series are transformed to standard-normal variates, and a variate is related to those of the other series of the same month, those of the previous month of all series, the lag-one moving-average component, and the random component. 2 M parameters of each series are ite ...Daha fazlası

Makale/Derleme 2022 Hydrological Sciences Journal67 ( 5 ) , pp. 7 - 758 4 Görüntülenme
Erişime Açık

Medicine distribution problem between pharmacy warehouse and pharmacies

Erkan KÖSE

The pharmaceutical supply chain consists of supplier, distributor (pharmaceutical warehouses) and retail (pharmacists) stages. Since the costs of some pharmaceuticals are high while their shelf life is short, it is not possible for pharmacies to keep all kinds of drugs in their stocks. Instead, pharmacies maintain reasonable amounts of inventory for products with high demand, while fulfilling orders for those with low demand through pharmaceutical warehouses. In this study, the real life drug distribution problem of a pharmacy warehouse that meets demands of 186 pharmacies in 9 regions is addr ...Daha fazlası

Makale/Derleme 2022 Sadhana Indian Academy of Sciences 47 ( 3 ) , pp. 1 - 10 5 Görüntülenme
Erişime Açık

Error analysis of SISO and dual-branch communications with generalized Gaussian noise over FTR fading channels

Mehmet BİLİM

In this paper, we present error probability analysis for single-input single-output (SISO) and asymmetric dual-branch networks with additive white generalized Gaussian noise (AWGGN) over millimeter-wave (mmW) fluctuating two-ray (FTR) fading channels. Then, we examine the error probability evaluation of a SISO system with imperfect phase errors over mmW FTR fading channels. The probability density function (PDF) approach is employed for the error probability performance evaluation and the novel PDF of the asymmetric dual-branch system over Nakagami-m/mmW FTR fading channels is obtained. Specif ...Daha fazlası

Makale/Derleme 2022 TURKISH JOURNAL OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCES30 ( 6 ) , pp. 2 - 2043 6 Görüntülenme
Erişime Açık

A comprehensive analytical perspective of ASEP for Beaulieu-Xie fading channels

Mehmet BİLİM

This study presents the average symbol error probability (ASEP) performanceof a single-input single-output communication with imperfect phase error(IPE) and without IPE over the Beaulieu-Xie fading channels. The Beaulieu-Xie fading model is proposed recently and it is a popular characterization forthe line-of-sight and non-line-of-sight environments. The proposed theoreticalanalysis, which is based on the probability density function, is enough generaland applicable in some real-life scenarios. For both cases, closed-form exact,approximate, and asymptotic expressions are derived for the ASEP o ...Daha fazlası

Makale/Derleme 2022 INTERNATIONAL JOURNAL OF COMMUNICATION SYSTEMS35 ( 13 ) , pp. 1 - 15 4 Görüntülenme
Erişime Açık

Sidelobe level suppression for elliptical antenna arrays using modified Salp swarm algorithm

Erhan KURT | Kerim GÜNEY

In this study, a modified version of salp swarm algorithm (MSSA) is used to synthesize elliptical antenna arrays (EAAs).The original salp swarm algorithm (SSA) is an optimization algorithm inspired by the behavior of salps in nature, which isused to solve engineering problems. The main purpose of the synthesis in this study is to obtain an EAA pattern with lowmaximum sidelobe levels (MSLs) for a fixed narrow first null beamwidth (FNBW). For different examples, the amplitude andangular position values of the antenna array elements are considered as optimization parameters. To show the effective ...Daha fazlası

Makale/Derleme 2022 Journal of Electrical Engineering-Elektrotechnicky Casopis73 ( 5 ) , pp. 3 - 331 8 Görüntülenme
Erişime Açık

Cascaded double fading channels: A case of kappa-mu shadowing

Mehmet BİLİM

In this study, the cascaded double κ−μ shadowed fading model is mathematically introduced. A novel expression is obtained for the cumulative distribution function (CDF) of the cascaded double κ−μ shadowed fading channels by using Meijer’s G function and Laplace transform. Based on the obtained CDF expression, the exact and asymptotic expressions are derived for the outage probability (OP), the average bit error rate (BER) for various modulations of the considered channel model. The OP and the average BER curves with exact simulations obtained by the proposed expressions are presented for diffe ...Daha fazlası

Makale/Derleme 2022 Physical Communication52 ( 2 ) , pp. 1 - 6 5 Görüntülenme
Erişime Açık

Synthesizing of concentric circular antenna arrays by using a combination of ant lion optimizer and sequential quadratic programming

Kerim GÜNEY | Erhan KURT

Antenna array synthesis is quite a popular topic in electromagnetics and finding suitable array parameter values is a challenging nonlinear engineering problem in this field. In recent years, it has been realized that optimization algorithms can be used to achieve desired solutions in this area. Besides, improvements in the optimization algorithms make it possible to perform synthesis processes on different array structures and to obtain better results. In this paper, a method based on a combination of ant lion optimizer (ALO) and sequential quadratic programming (SQP) is proposed for the conc ...Daha fazlası

Makale/Derleme 2022 International Journal of Numerical Modelling: Electronic Networks, Devices and Fields , pp. 1 - 18 8 Görüntülenme
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