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Institution

Amirkabir University of Technology

EducationTehran, Iran
About: Amirkabir University of Technology is a education organization based out in Tehran, Iran. It is known for research contribution in the topics: Nonlinear system & Fuzzy logic. The organization has 15254 authors who have published 31165 publications receiving 487551 citations. The organization is also known as: Tehran Polytechnic & Tehran Polytechnic University.


Papers
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Journal ArticleDOI
TL;DR: In this paper, a survey and qualitative comparison of the existing cell association and power control schemes is provided to demonstrate their limitations for interference management in 5G networks with shared spectrum access (i.e., when the different network tiers share the same licensed spectrum).
Abstract: The evolving fifth generation (5G) cellular wireless networks are envisioned to overcome the fundamental challenges of existing cellular networks, for example, higher data rates, excellent end-to-end performance, and user-coverage in hot-spots and crowded areas with lower latency, energy consumption, and cost per information transfer. To address these challenges, 5G systems will adopt a multi-tier architecture consisting of macrocells, different types of licensed small cells, relays, and device-to-device (D2D) networks to serve users with different quality-of-service (QoS) requirements in a spectrum and energy-efficient manner. Starting with the visions and requirements of 5G multi-tier networks, this article outlines the challenges of interference management (e.g. power control, cell association) in these networks with shared spectrum access (i.e. when the different network tiers share the same licensed spectrum). It is argued that the existing interference management schemes will not be able to address the interference management problem in prioritized 5G multi-tier networks where users in different tiers have different priorities for channel access. In this context a survey and qualitative comparison of the existing cell association and power control schemes is provided to demonstrate their limitations for interference management in 5G networks. Open challenges are highlighted and guidelines are provided to modify the existing schemes in order to overcome these limitations and make them suitable for the emerging 5G systems.

552 citations

Journal ArticleDOI
TL;DR: A review on recent efforts and development in multi-criteria location problems in three categories including bi-objective, multiobjective and multi-attribute problems and their solution methods is provided in this article.

551 citations

Journal ArticleDOI
TL;DR: This survey tries to review all aspects of the covering problems by stressing the works after Schilling, Jayaraman, and Barkhi (1993).

540 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of binder systems containing different levels of silica fume on fresh and mechanical properties of concrete were investigated, and the results indicated that as the proportion of fume increased, the workability of concrete decreased but its short-term mechanical properties such as 28-day compressive strength and secant modulus improved.
Abstract: This paper presents the results of experimental work on short- and long-term mechanical properties of high-strength concrete containing different levels of silica fume. The aim of the study was to investigate the effects of binder systems containing different levels of silica fume on fresh and mechanical properties of concrete. The work focused on concrete mixes having a fixed water/binder ratio of 0.35 and a constant total binder content of 500 kg/m3. The percentages of silica fume that replaced cement in this research were: 0%, 6%, 10% and 15%. Apart from measuring the workability of fresh concrete, the mechanical properties evaluated were: development of compressive strength; secant modulus of elasticity; strain due to creep, shrinkage, swelling and moisture movement. The results of this research indicate that as the proportion of silica fume increased, the workability of concrete decreased but its short-term mechanical properties such as 28-day compressive strength and secant modulus improved. Also the percentages of silica fume replacement did not have a significant influence on total shrinkage; however, the autogenous shrinkage of concrete increased as the amount of silica fume increased. Moreover, the basic creep of concrete decreased at higher silica fume replacement levels. Drying creep (total creep − basic creep) of specimens was negligible in this investigation. The results of swelling tests after shrinkage and creep indicate that increasing the proportion of silica fume lowered the amount of expansion. Because the existing models for predicting creep and shrinkage were inaccurate for high-strength concrete containing silica fume, alternative prediction models are presented here.

531 citations

Journal ArticleDOI
TL;DR: This work has provided an illustrated and comprehensive study from the view of a supramolecular chemist, interested in the synthesizing and studying chemical aggregates on the nanoscale for the development of nanotechnological clusters including niosomes.

516 citations


Authors

Showing all 15352 results

NameH-indexPapersCitations
Ali Mohammadi106114954596
Mehdi Dehghan8387529225
Morteza Mahmoudi8333426229
Gaurav Sharma82124431482
Vladimir A. Rakov6745914918
Mohammad Reza Ganjali65103925238
Bahram Ramezanzadeh6235212946
Muhammad Sahimi6248117334
Niyaz Mohammad Mahmoodi6121810080
Amir A. Zadpoor6129411653
Mohammad Hossein Ahmadi6047711659
Goodarz Ahmadi6077817735
Maryam Kavousi5925822009
Keith W. Hipel5854314045
Danial Jahed Armaghani552128400
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202346
2022216
20212,493
20202,359
20192,368
20182,266