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Fahri Murat,İrfan Kaymaz,Abdullah Tahir Şensoy,İsmail H. Korkmaz 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.1
Manufacturing high-quality and desired products from additive manufacturing necessitate careful adjustment of the processparameters. Various methods can be utilised to determine optimum process parameters, such as the Taguchi method, Designof Experiments (DoE). Rather than evaluating limited information obtained from statistical analysis of the experiments, optimisationmethods can help find the best possible combination for the process parameters. Therefore, an optimisation approachbased on Particle Swarm Optimization (PSO) was utilised to find the optimum process parameters. The most importantprocess parameters of Selective Laser Melting (SLM) such as laser power, layer thickness, scan speed, and build orientationwere selected as input parameters, and their effects on the tensile properties of the manufactured part were investigated to findout the optimal operating conditions for the SLM process. Since there is not any explicit mathematical expression relatingthese process parameters to the tensile strength, the Response Surface Method (RSM) was used to obtain a meta-model sothat it can be used as an objective function in the optimisation formulation. This approach enabled us to predict the optimumprocess parameters to maximise the tensile strength without conducting an excessive number of experiments. Moreover, themathematical model can also predict tensile strength corresponding to the parameter values that are not tested according tothe DoE chosen for such studies. Furthermore, it was also shown that the PSO outperforms the Genetic Algorithm (GA),which is widely employed to find out the optimum process parameters, in terms of less number of iteration.
SU-MIMO based uplink non-orthogonal multiple access for 5G
Murti, Fahri Wisnu,Siregar, Rahmat Faddli,Shin, Soo Young Elsevier 2018 JOURNAL OF NETWORK AND COMPUTER APPLICATIONS - Vol.110 No.-
<P><B>Abstract</B></P> <P>In this paper, we present the application of single user multiple input multiple output (SU-MIMO) to uplink (UL) non-orthogonal multiple access (NOMA) to enhance UL capacity. However, SU-MIMO NOMA produces inter-stream interference in addition to intra-pair interference, leading to performance degradation. Therefore, a novel UL SU-MIMO NOMA signal detection, combining minimum mean square error (MMSE) with dual-level iterative successive interference cancelation is proposed to mitigate the interference. Additionally, generalized dynamic power allocation is proposed at UL transmitters to ensure the capacity for NOMA over orthogonal multiple access (OMA) and the capability to overcome error floor phenomenon caused by fixed power allocation. A practical SIC scheme is also considered to create a more realistic scenario than the perfect SIC. The proposed system is evaluated in terms of capacity, throughput, error performance, and computational complexity. The results show that the proposed SU-MIMO based NOMA outperforms in capacity, throughput, and error performance at the same MMSE complexity order.</P>
Mohammad Fahri HUSAENI,Aceng KOSASIH,Aceng KOSASIH Asian Center for Women's Studies : Ewha Womans Uni 2023 Asian Journal of Women's Studies(AJWS) Vol.29 No.1
Implementing gender mainstreaming policies has become one important strategy for solving gender-based issues in society, especially in developing countries like Indonesia. However, one anomaly that becomes a concern in Indonesia’s gender mainstreaming strategy is how religious youth organizations would conflictingly react to this issue, as they may become a determining factor in how society would shift in dealing with gender issues. This study investigates the youth in Persis, a prominent Islamic youth organization in Indonesia, to understand gender mainstreaming in Indonesia. Using a qualitative approach and case study design, the study revealed that informants have doubts, skepticism, and slight conflict towards gender mainstreaming policies, due to misunderstandings and differences in personal and religious beliefs. This study provides insights into the gender mainstreaming views of a religious youth organization and how gender-based policies, programs, and research on gender have been and could be implemented in Indonesia.
Synthesis and properties of sol-gel derived transparent ZnO thin films: Effect of indium doping
Eyüp Fahri Keskenler,Güven Turgut 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.12
High quality and transparent indium doped ZnO (IZO) thin films were deposited on glass substrates by sol-gel spin coatingmethod. Zinc acetate and indium (III) chloride were used as precursor solution materials. Structural, morphological, andoptical properties of the films were investigated as a function of indium doping ranging from 0.5% to 2.0 at % by X-raydiffraction, scanning electron microscopy, transmission and energy dispersive X-ray techniques. The films had polycrystallinenature and exhibited a hexagonal wurtzite structure with preferred c-axis orientation. The film surfaces exhibited uniformparticle-like and granular morphologies. The optical transmittance spectra of the undoped ZnO and IZO films were taken inthe wavelength ranging from 350-1000 nm. The transmittance IZO films compared to undoped ZnO has increased withincreasing indium content. The chemical composition of the films indicated the presence of indium element in the ZnO films. These results make IZO thin films an attractive candidate for transparent material applications such as solar cells.
Effect of Air Inlet Hole Diameter of Venturi Tube on Air Injection Rate
Ahmet Baylar,Fahri Ozkan,Mehmet Unsal 대한토목학회 2010 KSCE Journal of Civil Engineering Vol.14 No.4
The oxygen concentration in water is a prime indicator of the water quality for human use as well as for the aquatic biota. The physical process of oxygen transfer or oxygen absorption from the atmosphere acts to replenish the used oxygen. This process is termed re-aeration or aeration. Venturi aeration is a method of aeration that has become popular in recent years. A venturi tube allows air bubbles to be inserted into flowing water from air inlet holes and so increases oxygen levels in the water. In the present study, a series of experiments on venturi tubes were conducted to investigate the effect of air inlet hole diameter on air injection. It was observed from the results that air inlet hole diameter on venturi tube played a significant role in air injection and there was an optimal diameter that maximizes air injection. Moreover, a multiple non-linear regression equation was obtained for venturi tubes relating air flow and water flow to Reynolds number, inlet diameter and air inlet hole diameter.
The Effect of Flow Patterns and Energy Dissipation over Stepped Chutes on Aeration Efficiency
Ahmet Baylar,Mehmet Unsal,Fahri Ozkan 대한토목학회 2011 KSCE JOURNAL OF CIVIL ENGINEERING Vol.15 No.8
Stepped chutes that are commonly used for gabion weirs, river training, irrigation channels, and storm waterways have become popular in recent years mainly due to the intrinsic low-cost and the speed of construction. Stepped chutes are used also for in-stream re-aeration and in water treatment plants to enhance the air-water transfer of atmospheric gases and of volatile organic components. In a stepped chute, the provision of steps can produce significant energy dissipation. This paper seeks the effect of energy dissipation over stepped chutes on aeration efficiency. It is observed from the results that aeration efficiency increases with increasing energyloss ratio. There is higher energy dissipation in nappe flows than skimming flow situations and nappe flow regime lead to greater aeration efficiency than skimming flow regime. Moreover, regression equations are obtained relating aeration efficiency to stepped chute slope and energy-loss ratio. For this aim, genetic expression programming, a recently developed artificial intelligence technique, is used. The model equations obtained have high correlation coefficients and low minimum square error values.
Optical reconstruction of transparent objects with phase-only SLMs.
Stoykova, Elena,Yara?, Fahri,Yontem, Ali ?zg?r,Kang, Hoonjong,Onural, Levent,Hamel, Philippe,Delacr?taz, Yves,Bergo?nd, Isabelle,Arfire, Cristian,Depeursinge, Christian Optical Society of America 2013 Optics express Vol.21 No.23
<P>Three approaches for visualization of transparent micro-objects from holographic data using phase-only SLMs are described. The objects are silicon micro-lenses captured in the near infrared by means of digital holographic microscopy and a simulated weakly refracting 3D object with size in the micrometer range. In the first method, profilometric/tomographic data are retrieved from captured holograms and converted into a 3D point cloud which allows for computer generation of multi-view phase holograms using Rayleigh-Sommerfeld formulation. In the second method, the microlens is computationally placed in front of a textured object to simulate the image of the textured data as seen through the lens. In the third method, direct optical reconstruction of the micrometer object through a digital lens by modifying the phase with the Gerchberg-Saxton algorithm is achieved.</P>