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1.
Aromatic characterization of Graševina wines from Slavonia and Podunavlje sub-regions
Mitja Martelanc, Guillaume Antalick, Tatjana Radovanović, Branka Mozetič Vodopivec, Melita Sternad Lemut, Ahmad Hosseini, Valentina Obradović, Josip Mesić, Lorena Butinar, 2024, izvirni znanstveni članek

Opis: This study investigated the chemical aromatic profiles of 60 volatile organic compounds (VOCs), including 21 terpenes, 6 norisoprenoids, 6 volatile phenols, 4 C-6 alcohols, and 23 esters, in Graševina wines originating from Slavonia and Podunavlje sub-regions (Croatia). Headspace solid-phase microextraction gas chromatography coupled with mass spectrometric detection (HS-SPME-GCMS) was used to assess 60 VOCs, and a novel HS-SPME-GCMS method for the determination of terpenes and norisoprenoids was developed and validated. Statistical analysis also found no significant differences between VOCs present in Graševina wines and others wines (Chardonnay and Pinot gris); nonetheless, comparison of VOC fingerprints between different wines from the same producer showed that four terpenes (α-terpinene, γ-terpinene, 1,4-cineol, and 4-terpineol) were present in higher amounts in Graševina wines when compared to other wines. By exclusively examining VOCs within Graševina wines through the utilization of a heatmap and hierarchical clustering, a distinct visualization of samples and VOCs emerged, highlighting the vintage effect. Simultaneously, a partial least squares discriminant analysis model was developed with a confidence interval of 95%, demonstrating a noticeable distinction between samples originating from the western and eastern regions. Furthermore, by employing the heatmap using only VOCs from the terpene and norisoprenoidic groups, a clear separation of samples into two groups was observed based on geographical origin; namely, higher concentrations of norisoprenoids and terpenes were observed in the Slavonia sub-region. These results suggest that terpenes and norisoprenoids to a lower extent may be valuable aromatic markers for the regional typicality of Graševina wines.
Ključne besede: Graševina–Welschriesling, aromatic profiling, HS-SPME-GCMS, terpenes
Objavljeno v RUNG: 08.04.2024; Ogledov: 203; Prenosov: 5
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2.
An improved low-input resistance folded-cascode transimpedance amplifier for giga-bit per second optical communication front-ends
Soorena Zohoori, Ahmad Hosseini, Mehrdad Amirkhan Amirkhan Dehkordi, Seyed Mehdi Mirsanei, 2023, izvirni znanstveni članek

Opis: The present study is devoted to articulating a modified folded‐cascode circuit, to make folded‐cascode structures an attractive configuration as a transimpedance amplifier (TIA) for being employed in Giga‐bit per second optical communication receiver systems. Giga‐bps communication receivers are highly necessitating circuits to isolate the input parasitic capacitance of the photodiode. The present modification makes folded cascodes comparable to the famous regulated cascode (RGC) structures by isolating this parasitic capacitor almost by the same quantity. The system is shown to be capable of operating at 2.5 Gbps up to 8 Gbps data rate with a fixed bandwidth. The paper analyzes and evaluates the designed circuit mathematically, and the obtained simulated results from Cadence using TSMC 65 nm CMOS validate the suitability of the modified circuit as a TIA.
Ključne besede: improved folded-cascode, low input resistance, low noise, optical receiver, transimepdance amplifier
Objavljeno v RUNG: 08.12.2023; Ogledov: 490; Prenosov: 2
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3.
Max-type reliability in uncertain post-disaster networks through the lens of sensitivity and stability analysis
Ahmad Hosseini, 2024, izvirni znanstveni članek

Opis: The functionality of infrastructures, particularly in densely populated areas, is greatly impacted by natural disasters, resulting in uncertain networks. Thus, it is important for crisis management professionals and computer-based systems for transportation networks (such as expert systems) to utilize trustworthy data and robust computational methodologies when addressing convoluted decision-making predicaments concerning the design of transportation networks and optimal routes. This study aims to evaluate the vulnerability of paths in post-disaster transportation networks, with the aim of facilitating rescue operations and ensuring the safe delivery of supplies to affected regions. To investigate the problem of links' tolerances in uncertain networks and the resiliency and reliability of paths, an uncertainty theory-based model that employs minmax optimization with a bottleneck objective function is used. The model addresses the uncertain maximum reliable paths problem, which takes into account uncertain risk variables associated with links. Rather than using conventional methods for calculating the deterministic tolerances of a single element in combinatorial optimization, this study introduces a generalization of stability analysis based on tolerances while the perturbations in a group of links are involved. The analysis defines set tolerances that specify the minimum and maximum values that a designated group of links could simultaneously fluctuate while maintaining the optimality of the max-type reliable paths. The study shows that set tolerances can be considered as well-defined and proposes computational methods to calculate or bound such quantities - which were previously unresearched and difficult to measure. The model and methods are demonstrated to be both theoretically and numerically efficient by applying them to four subnetworks from our case study. In conclusion, this study provides a comprehensive approach to addressing uncertainty in reliability problems in networks, with potential applications in various fields.
Ključne besede: Disaster Management, Network Reliability, Stability Analysis, Transportation, Uncertainty
Objavljeno v RUNG: 24.11.2023; Ogledov: 433; Prenosov: 3
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Determining the Optimal Flows in Zero-Time Dynamic Networks
Ahmad Hosseini, Fardin Dashty Saridarq, 2012, izvirni znanstveni članek

Ključne besede: Linear algebra, Networks/graphs, Linear programming
Objavljeno v RUNG: 15.02.2023; Ogledov: 1021; Prenosov: 1
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8.
Uncertain Most Reliable Data Transmission Path: A Chance-Constrained Scenario with Risk Considerations
Ahmad Hosseini, 2015, predavanje na tuji univerzi

Ključne besede: Uncertainty, Most Reliable Path, Chance-Constrained
Objavljeno v RUNG: 15.02.2023; Ogledov: 811; Prenosov: 0
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9.
Optimized Routing in Forestry with the Consideration of Multiple Economical and Ecological Objectives
Ahmad Hosseini, Ola Lindroos, Eddie Wadbro, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: Optimization, Forestry, Strip Road
Objavljeno v RUNG: 15.02.2023; Ogledov: 1046; Prenosov: 0
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10.
Connectivity reliability in uncertain networks with stability analysis
Ahmad Hosseini, Eddie Wadbro, 2016, izvirni znanstveni članek

Ključne besede: Traffic network, Uncertainty theory, Reliability, Chance-constrained, Stability analysis
Objavljeno v RUNG: 14.02.2023; Ogledov: 881; Prenosov: 0
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