Nothing Special   »   [go: up one dir, main page]

You seem to have javascript disabled. Please note that many of the page functionalities won't work as expected without javascript enabled.
 
 
Sign in to use this feature.

Years

Between: -

Subjects

remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline

Journals

remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline

Article Types

Countries / Regions

remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline
remove_circle_outline

Search Results (1,613)

Search Parameters:
Keywords = shared mobility

Order results
Result details
Results per page
Select all
Export citation of selected articles as:
19 pages, 2205 KiB  
Article
An Ultra-Fast Validated Green UPLC-MS/MS Approach for Assessing Revumenib in Human Liver Microsomes: In Vitro Absorption, Distribution, Metabolism, and Excretion and Metabolic Stability Evaluation
by Mohamed W. Attwa, Ali S. Abdelhameed and Adnan A. Kadi
Medicina 2024, 60(12), 1914; https://doi.org/10.3390/medicina60121914 - 21 Nov 2024
Abstract
Background and Objectives: Revumenib (SNDX-5613) is a powerful and specific inhibitor of the menin–KMT2A binding interaction. It is a small molecule that is currently being researched to treat KMT2A-rearranged (KMT2Ar) acute leukemias. Revumenib (RVB) has received Orphan Drug Designation from the US FDA [...] Read more.
Background and Objectives: Revumenib (SNDX-5613) is a powerful and specific inhibitor of the menin–KMT2A binding interaction. It is a small molecule that is currently being researched to treat KMT2A-rearranged (KMT2Ar) acute leukemias. Revumenib (RVB) has received Orphan Drug Designation from the US FDA for treating patients with AML. It has also been granted Fast Track designation by the FDA for treating pediatric and adult patients with R/R acute leukemias that have a KMT2Ar or NPM1 mutation. Materials and Methods: The target of this research was to create a fast, precise, green, and extremely sensitive UPLC-MS/MS technique for the estimation of the RVB level in human liver microsomes (HLMs), employing an ESI source. The validation procedures were carried out in accordance with the bioanalytical technique validation requirements established by the US Food and Drug Administration that involve linearity, selectivity, precision, accuracy, stability, matrix effect, and extraction recovery. The outcome data of the validation features of the UPLC-MS/MS approach were acceptable according to FDA guidelines. RVB parent ions were formed in the positive ESI source and its two fragment ions were estimated employing multiple reaction monitoring (MRM) mode. The separation of RVB and encorafenib was achieved using a C8 column (2.1 mm, 50 mm, and 3.5 µm) and isocratic mobile phase. Results: The RVB calibration curve linearity ranged from 1 to 3000 ng/mL (y = 0.6515x − 0.5459 and R2 = 0.9945). The inter-day precision and accuracy spanned from −0.23% to 11.33%, while the intra-day precision and accuracy spanned from −0.88% to 11.67%, verifying the reproducibility of the UPLC-MS/MS analytical technique. The sensitivity of the developed methodology demonstrated its capability to quantify RVB levels at an LOQ of 0.96 ng/mL. The AGREE score was 0.77, confirming the greenness of the current method. The low in vitro t1/2 (14.93 min) and high intrinsic clearance (54.31 mL/min/kg) of RVB revealed that RVB shares similarities with medications that have a high extraction ratio. Conclusions: The present LC-MS/MS approach is considered the first analytical approach with the application of metabolic stability assessment for RVB estimation in HLMs. These methods are essential for advancing the development of new pharmaceuticals, particularly in enhancing metabolic stability. Full article
(This article belongs to the Special Issue Acute Myeloid Leukemia: Update on Diagnosis, Therapy, and Monitoring)
Show Figures

Figure 1

Figure 1
<p>Chemical structure of the target analyte, revumenib, and the encorafenib that was used as an internal standard in the UPLC-MS/MS analysis of RVB.</p>
Full article ">Figure 2
<p>The RVB ADME radar chart produced from the in silico SwissADME program.</p>
Full article ">Figure 3
<p>MRM spectrum showing PI mass scan of RVB as protonated molecular ion [M + H]<sup>+</sup> (<b>A</b>) and MRM spectrum showing PI mass spectrum scan of ENF [M + H]<sup>+</sup> (<b>B</b>). The probable dissociations behaviours are elucidated.</p>
Full article ">Figure 4
<p>The MRM chromatogram of the first control sample (negative control HLMs) demonstrated the lack of any interference in the retention times of RVB and ENF (<b>A</b>). The MRM chromatogram of the second control sample, positive control (Blank HLMs combined with ENF at 1000 ng/mL) (<b>B</b>). The superimposed MRM chromatograms of the 9 RVB CSs, as well as the 3 QCs (<b>C</b>). The MRM chromatograms revealed analytical peaks conforming to RVB (at 0.34 min) and ENF at 1000 ng/mL and a retention time of 0.66 min).</p>
Full article ">Figure 5
<p>RVB LLOQ chromatographic peak (1 ng/mL) (<b>A</b>). The ENF (1000 ng/mL) peak that was used as IS (<b>B</b>).</p>
Full article ">Figure 6
<p>The AGREE programme was employed to demonstrate the greenness scale profile of the established UPLC-MS/MS approach, shown in the form of a circular diagram of twelve separate characteristics.</p>
Full article ">Figure 7
<p>(<b>A</b>) RVB metabolic stability curve representing percentage of RVB residual concentration against time intervals; (<b>B</b>) linear segment of the metabolic stability curve representing the LN of the percentage of RVB residual level against time intervals, showing the regression equation of the linear part.</p>
Full article ">
18 pages, 1238 KiB  
Article
Supporting the Cultural Identity Development of Indigenous Youth: Findings from an Indigenous Educators’ Community-Of-Practice
by Angela Lunda, Amber Frommherz, William Gamaas Bolton, Chelsee Cook, Barbara Dude, Naomi Leask, Roberta Littlefield, Jennifer McCarty, Shawna Puustinen and Nastasia Vaska
Educ. Sci. 2024, 14(12), 1272; https://doi.org/10.3390/educsci14121272 - 21 Nov 2024
Abstract
Research reveals a positive impact on educational achievement for Indigenous students when their teachers are also Indigenous. The educational value of shared identity between students and teachers manifests in the form of increased student attendance rates, grades, and graduation rates. Fewer than 5% [...] Read more.
Research reveals a positive impact on educational achievement for Indigenous students when their teachers are also Indigenous. The educational value of shared identity between students and teachers manifests in the form of increased student attendance rates, grades, and graduation rates. Fewer than 5% of public-school teachers in Alaska are Indigenous, while nearly 20% of students are Indigenous. Thus, it is unlikely that most Indigenous students in Alaska will experience a shared cultural identity with their teachers—nor would it be desirable, in this age of global mobility, for society to strive for teachers and students to share cultural identity in all instances. Yet it is important to discern what teaching practices and teacher dispositions support the cultural identity development (CID) of Indigenous children. This project brought together Indigenous educators from across Alaska to critically examine their practice as educators and to seek answers to the research question. Utilizing a collaborative autoethnographic framework, qualitative data were coded and analyzed to uncover answers to the research question. Key findings from this study indicate that teaching and using the local Indigenous language, shared cultural history documented in stories, and experiences related to the Land contribute to students’ CID. Furthermore, findings reveal that micro cultural validations, fleeting interactions between teachers and students, play a significant role in supporting the cultural identity development of Indigenous youth. Findings also suggest that Indigenous teachers are best positioned to discern the teaching practices that contribute to students’ cultural identity development. Full article
Show Figures

Figure 1

Figure 1
<p>Conceptual framework: Twined cedar rope with individual strands of cedar bark representing the five cultural identity development (CID)-nurturing teaching practices. <span class="html-italic">Note.</span> Traditionally twined cedar bark rope fashioned into bracelets and necklaces made by Metlakatla High School Ts’msyen Studies students in 2022 in Metlakatla, AK, USA. (Photo courtesy of Naomi Leask).</p>
Full article ">Figure 2
<p>Indigenous peoples and languages of Alaska [<a href="#B48-education-14-01272" class="html-bibr">48</a>].</p>
Full article ">
16 pages, 966 KiB  
Article
A Diachronic Agent-Based Framework to Model MaaS Programs
by Maria Nadia Postorino and Giuseppe M. L. Sarnè
Urban Sci. 2024, 8(4), 211; https://doi.org/10.3390/urbansci8040211 - 15 Nov 2024
Viewed by 299
Abstract
In recent years, mobility as a service (MaaS) has been thought as one of the opportunities for shifting towards shared travel solutions with respect to private transport modes, particularly owned cars. Although many MaaS aspects have been explored in the literature, there are [...] Read more.
In recent years, mobility as a service (MaaS) has been thought as one of the opportunities for shifting towards shared travel solutions with respect to private transport modes, particularly owned cars. Although many MaaS aspects have been explored in the literature, there are still issues, such as platform implementations, travel solution generation, and the user’s role for making an effective system, that require more research. This paper extends and improves a previous study carried out by the authors by providing more details and experiments. The paper proposes a diachronic network model for representing travel services available in a given MaaS platform by using an agent-based approach to simulate the interactions between travel operators and travelers. Particularly, the diachronic network model allows the consideration of both the spatial and temporal features of the available transport services, while the agent-based framework allows the representation of how shared services might be used and which effects, in terms of modal split, could be expected. The final aim is to provide insights for setting the architecture of an agent-based MaaS platform where transport operators would share their data for providing seamless travel opportunities to travelers. The results obtained for a simulated test case are promising. Particularly, there are interesting findings concerning the traffic congestion boundary values that would move users towards shared travel solutions. Full article
Show Figures

Figure 1

Figure 1
<p>Overview of the methodological approach.</p>
Full article ">Figure 2
<p>Diachronic network: representation of transport supply for scheduled services.</p>
Full article ">Figure 3
<p>The agent-based structure including user’s choice by discrete choice models.</p>
Full article ">Figure 4
<p>Multi-layers structure in the proposed framework.</p>
Full article ">Figure 5
<p>Percentage variations of users’ choices in the simulated MaaS context.</p>
Full article ">
15 pages, 772 KiB  
Article
Use of Mobile Phones and Radiofrequency-Emitting Devices in the COSMOS-France Cohort
by Isabelle Deltour, Florence Guida, Céline Ribet, Marie Zins, Marcel Goldberg and Joachim Schüz
Int. J. Environ. Res. Public Health 2024, 21(11), 1514; https://doi.org/10.3390/ijerph21111514 - 14 Nov 2024
Viewed by 469
Abstract
COSMOS-France is the French part of the COSMOS project, an international prospective cohort study that investigates whether the use of mobile phones and other wireless technologies is associated with health effects and symptoms (cancers, cardiovascular diseases, neurologic pathologies, tinnitus, headaches, or sleep and [...] Read more.
COSMOS-France is the French part of the COSMOS project, an international prospective cohort study that investigates whether the use of mobile phones and other wireless technologies is associated with health effects and symptoms (cancers, cardiovascular diseases, neurologic pathologies, tinnitus, headaches, or sleep and mood disturbances). Here, we provide the first descriptive results of COSMOS-France, a cohort nested in the general population-based cohort of adults named Constances. Methods: A total of 39,284 Constances volunteers were invited to participate in the COSMOS-France study during the pilot (2017) and main recruitment phase (2019). Participants were asked to complete detailed questionnaires on their mobile phone use, health conditions, and personal characteristics. We examined the association between mobile phone use, including usage for calls and Voice over Internet Protocol (VoIP), cordless phone use, and Wi-Fi usage with age, sex, education, smoking status, body mass index (BMI), and handedness. Results: The participation rate was 48.4%, resulting in 18,502 questionnaires in the analyzed dataset. Mobile phone use was reported by 96.1% (N = 17,782). Users reported typically calling 5–29 min per week (37.1%, N = 6600), making one to four calls per day (52.9%, N = 9408), using one phone (83.9%, N = 14,921) and not sharing it (80.4% N = 14,295), mostly using the phone on the side of the head of their dominant hand (59.1%, N = 10,300), not using loudspeakers or hands-free kits, and not using VoIP (84.9% N = 15,088). Individuals’ age and sex modified this picture, sometimes markedly. Education and smoking status were associated with ever use and call duration, but neither BMI nor handedness was. Cordless phone use was reported by 66.0% of the population, and Wi-Fi use was reported by 88.4%. Conclusion: In this cross-sectional presentation of contemporary mobile phone usage in France, age and sex were important determinants of use patterns. Full article
(This article belongs to the Special Issue Epidemiology of Lifestyle-Related Diseases)
Show Figures

Figure 1

Figure 1
<p>Flow chart for participation in the COSMOS-France study. Note: * excluded from the calculation of the participation rate.</p>
Full article ">Figure 2
<p>Description of laterality of mobile phone use among left-handed, ambidextrous, and right-handed participants of Cosmos-France, 2017–19. Percentages are shown excluding missing values, presented in white font.</p>
Full article ">
13 pages, 420 KiB  
Article
Towards a Decentralized Collaborative Framework for Scalable Edge AI
by Ahmed M. Abdelmoniem , Mona Jaber , Ali Anwar , Yuchao Zhang  and Mingliang Gao 
Future Internet 2024, 16(11), 421; https://doi.org/10.3390/fi16110421 - 14 Nov 2024
Viewed by 365
Abstract
Nowadays, Edge Intelligence has seen unprecedented growth in most of our daily life applications. Traditionally, most applications required significant efforts into data collection for data-driven analytics, raising privacy concerns. The proliferation of specialized hardware on sensors, wearable, mobile, and IoT devices has led [...] Read more.
Nowadays, Edge Intelligence has seen unprecedented growth in most of our daily life applications. Traditionally, most applications required significant efforts into data collection for data-driven analytics, raising privacy concerns. The proliferation of specialized hardware on sensors, wearable, mobile, and IoT devices has led to the growth of Edge Intelligence, which has become an integral part of the development cycle of most modern applications. However, scalability issues hinder their wide-scale adoption. We aim to focus on these challenges and propose a scalable decentralized edge intelligence framework. Therefore, we analyze and empirically evaluate the challenges of existing methods, and design an architecture that overcomes these challenges. The proposed approach is client-driven and model-centric, allowing models to be shared between entities in a scalable fashion. We conduct experiments over various benchmarks to show that the proposed approach presents an efficient alternative to the existing baseline method, and it can be a viable solution to scale edge intelligence. Full article
(This article belongs to the Special Issue IoT, Edge, and Cloud Computing in Smart Cities)
Show Figures

Figure 1

Figure 1
<p>Comparison of the existing traditional learning paradigms. (<b>a</b>) Centralized Learning involves data collection and then training. (<b>b</b>) Federated Learning involves clients training local models and aggregating them to a global model via a server. (<b>c</b>) Decentralized Learning involves clients collaboratively training on a common model via peer-to-peer exchange and coordination. (<b>d</b>) Transfer Learning involves knowledge within models being used to train other models via distillation.</p>
Full article ">Figure 2
<p>The proposed architectural design involves decentralized learning parties, secure model vaults to store the models hosted by edge servers and discovery service for model exchange hosted in the cloud.</p>
Full article ">Figure 3
<p>The quality impact of heterogeneity. We find that the values are zero in heterogeneous cases when the models diverge. The values are greater than one when an experiment results in better model accuracy than the baseline with the default configurations.</p>
Full article ">Figure 4
<p>Performance comparison in the LR-Synthetic scenario.</p>
Full article ">Figure 5
<p>Performance comparison in scenarios involving DNNs.</p>
Full article ">
18 pages, 1908 KiB  
Article
e-Fuel: An EV-Friendly Urgent Electrical Charge-Sharing Model with Preference-Based Off-Grid Services
by Ahmad Nahar Quttoum, Mohammed N. AlJarrah, Fawaz A. Khasawneh and Mohammad Bany Taha
World Electr. Veh. J. 2024, 15(11), 520; https://doi.org/10.3390/wevj15110520 - 12 Nov 2024
Viewed by 479
Abstract
Electric-powered vehicles (EVs) allow for an environmentally friendly and economic alternative to fuel-running ones. However, such an alternative is expected to impose further usage hikes and periods of instability on cities’ power systems. From their perspective, cities need to scale their infrastructure grids [...] Read more.
Electric-powered vehicles (EVs) allow for an environmentally friendly and economic alternative to fuel-running ones. However, such an alternative is expected to impose further usage hikes and periods of instability on cities’ power systems. From their perspective, cities need to scale their infrastructure grids to allow for adequate power resources to feed such new power-hungry consumers. Indeed, for such a green alternative to proceed, our power grids need to be ready to cope with any unexpected hikes in the power consumption rates without compromising the stability of the services provided to our homes and workplaces. Operators’ steps in this path are still modest, and the coverage of EV charging stations is still insufficient as they are trying to avoid any further costs for upgrading their infrastructures. The lack of price consideration for the charging services offered at charging stations may result in EV drivers paying higher costs compared to traditional fuel vehicles to charge their EVs’ batteries, hindering the economic incentive of owning such sorts of vehicles. Hence, it may take a while for sufficient coverage to exist. Although for drivers the adoption of EVs represents a city-friendly alternative with affordable expenses, it usually comes with range anxiety and battery charging concerns. In this work, we are presenting e-Fuel, a charge-sharing model that allows for preference-based mobile EV charging services. In e-Fuel, we are proposing a stable weight-based vehicle-to-vehicle matching algorithm, through which drivers of EVs will be capable of requesting instant mobile charge-sharing service for their EVs. In addition to being mobile, such charging services are customized, as they are chosen based on the drivers’ preferences of price-per-unit, charging speed, and time of delivery. The developed e-Fuel matching algorithm has been tested in various environments and settings. Compared to the benchmark price-based matching algorithm, the resulting matching decisions of e-Fuel come with balanced matching attributes that mostly allow for 6- to 7-fold shorter service delivery times for a minimal increase in service charges that vary between 9% and 65%. Full article
Show Figures

Figure 1

Figure 1
<p>Problem Demonstration.</p>
Full article ">Figure 2
<p>e-Fuel model demonstration.</p>
Full article ">Figure 3
<p>A bipartite graph matching charge requesters to charge providers.</p>
Full article ">Figure 4
<p>Testbed city area.</p>
Full article ">Figure 5
<p>Matching map of the proposed e-Fuel model.</p>
Full article ">Figure 6
<p>Matching map of the price-based benchmark model.</p>
Full article ">Figure 7
<p>Charge service prices.</p>
Full article ">Figure 8
<p>Time for service delivery.</p>
Full article ">Figure 9
<p>Price to time increase and decrease fractions.</p>
Full article ">Figure 10
<p>Balanced distance and price service attributes.</p>
Full article ">
45 pages, 24880 KiB  
Article
Future Low-Cost Urban Air Quality Monitoring Networks: Insights from the EU’s AirHeritage Project
by Saverio De Vito, Antonio Del Giudice, Gerardo D’Elia, Elena Esposito, Grazia Fattoruso, Sergio Ferlito, Fabrizio Formisano, Giuseppe Loffredo, Ettore Massera, Paolo D’Auria and Girolamo Di Francia
Atmosphere 2024, 15(11), 1351; https://doi.org/10.3390/atmos15111351 - 10 Nov 2024
Viewed by 591
Abstract
The last decade has seen a significant growth in the adoption of low-cost air quality monitoring systems (LCAQMSs), mostly driven by the need to overcome the spatial density limitations of traditional regulatory grade networks. However, urban air quality monitoring scenarios have proved extremely [...] Read more.
The last decade has seen a significant growth in the adoption of low-cost air quality monitoring systems (LCAQMSs), mostly driven by the need to overcome the spatial density limitations of traditional regulatory grade networks. However, urban air quality monitoring scenarios have proved extremely challenging for their operative deployment. In fact, these scenarios need pervasive, accurate, personalized monitoring solutions along with powerful data management technologies and targeted communications tools; otherwise, these scenarios can lead to a lack of stakeholder trust, awareness, and, consequently, environmental inequalities. The AirHeritage project, funded by the EU’s Urban Innovative Action (UIA) program, addressed these issues by integrating intelligent LCAQMSs with conventional monitoring systems and engaging the local community in multi-year measurement strategies. Its implementation allowed us to explore the benefits and limitations of citizen science approaches, the logistic and functional impacts of IoT infrastructures and calibration methodologies, and the integration of AI and geostatistical sensor fusion algorithms for mobile and opportunistic air quality measurements and reporting. Similar research or operative projects have been implemented in the recent past, often focusing on a limited set of the involved challenges. Unfortunately, detailed reports as well as recorded and/or cured data are often not publicly available, thus limiting the development of the field. This work openly reports on the lessons learned and experiences from the AirHeritage project, including device accuracy variance, field recording assessments, and high-resolution mapping outcomes, aiming to guide future implementations in similar contexts and support repeatability as well as further research by delivering an open datalake. By sharing these insights along with the gathered datalake, we aim to inform stakeholders, including researchers, citizens, public authorities, and agencies, about effective strategies for deploying and utilizing LCAQMSs to enhance air quality monitoring and public awareness on this challenging urban environment issue. Full article
(This article belongs to the Special Issue Air Quality and Energy Transition: Interactions and Impacts)
Show Figures

Figure 1

Figure 1
<p>The path from the goals to the selection of architectural design and technology for LCAQMS network deployment projects; connections illustrate possible routes throughout the project design choices.</p>
Full article ">Figure 2
<p>MONICA<sup>TM</sup> node diagram.</p>
Full article ">Figure 3
<p>Front and back picture of the MONICA node.</p>
Full article ">Figure 4
<p>Synthetic schema of complete software architecture for AirHeritage project.</p>
Full article ">Figure 5
<p>Status of air quality from fixed stations.</p>
Full article ">Figure 6
<p>Interactive map for a MONICA registered session. Mobility paths are highlighted using a color code base on the European Air Quality Index (EAQI).</p>
Full article ">Figure 7
<p>The position of the three co-location campaigns on a map performed in the AirHeritage project and details of the assembly and USB based on the multiple device power supply unit.</p>
Full article ">Figure 8
<p>Scheme of IoT architecture in stationary setup.</p>
Full article ">Figure 9
<p>The 7 fixed stations as deployed nearby the reference mobile station during calibration data gathering (co-location periods).</p>
Full article ">Figure 10
<p>Lognormal fitted pollutant concentrations as recorded in the first co-location period by mobile ARPAC air quality monitoring laboratory reporting reference values for data-driven calibration.</p>
Full article ">Figure 11
<p>Lognormal fitted concentrations of CO as recorded during the first co-location period by mobile ARPAC air quality monitoring laboratory reporting reference values for data-driven calibration.</p>
Full article ">Figure 12
<p>Distribution, across the 30 MONICA™ devices, of R<sup>2</sup> (first coloumn) and MAE (second column) short-term performance values for NO<sub>2</sub> (first row), O<sub>3</sub> (second row). and CO (third row), as estimated by MLR-based data-driven calibration in deployment period 1. The distributions appear to be skewed by a few outliers. Performed checks show that anomalous low performance is due to transients in raw sensor responses when they were first switched on.</p>
Full article ">Figure 13
<p>R<sup>2</sup> (1st coloumn) and MAE (2nd coloumn) and short-term performance for PM<sub>2.5</sub> (first row) and PM<sub>10</sub> (second row) as estimated by MLR-based data-driven calibration in deployment period 1, across the 30 MONICA devices.</p>
Full article ">Figure 14
<p>Histogram of PM<sub>2.5</sub> R<sup>2</sup> accuracy index; (violet) along with gaussian distribution fit (blue) 3 different device performance clusters are observable, each one corresponding to a co-location batch.</p>
Full article ">Figure 15
<p>Time series of PM<sub>10</sub> and PM<sub>2.5</sub> concentrations, as measured by the mobile laboratory, during the initial co-location period.</p>
Full article ">Figure 16
<p>Trend in the measured hourly mean NO<sub>2</sub> concentrations.</p>
Full article ">Figure 17
<p>The hourly mean concentration of ozone (O<sub>3</sub>) (black line) and the 8 h moving average (yellow line) are reported.</p>
Full article ">Figure 18
<p>Hourly average carbon monoxide CO concentration time series.</p>
Full article ">Figure 19
<p>The time series of PM<sub>10</sub> and PM2<sub>.5</sub> concentrations, as measured by the mobile laboratory, during the 2nd co-location period.</p>
Full article ">Figure 20
<p>Trend in the measured hourly mean NO<sub>2</sub> concentrations during the 2nd co-location.</p>
Full article ">Figure 21
<p>The hourly mean concentration of ozone (O3) (black line) and the 8 h moving average (yellow line) are presented along with the daily average temperature graph.</p>
Full article ">Figure 22
<p>Hourly average carbon monoxide CO concentration time series in 2nd co-location.</p>
Full article ">Figure 23
<p>The time series of PM<sub>10</sub> and PM<sub>2.5</sub> concentrations, as measured by the mobile laboratory, during the 3rd co-location period.</p>
Full article ">Figure 24
<p>NO<sub>2</sub> hourly average concentrations during the 3rd co-location.</p>
Full article ">Figure 25
<p>Hourly average concentration of ozone (O<sub>3</sub>) (black line) and the 8 h moving average (yellow line) are shown (<b>top</b>) with the daily average temperature plot (<b>bottom</b>).</p>
Full article ">Figure 26
<p>CO hourly average concentrations recorded by the mobile station during the 3rd co-location period.</p>
Full article ">Figure 27
<p>(<b>a</b>) An illustrative example of a user session as displayed on the webpage, accompanied by an indication of the location and the level of pollutants. (<b>b</b>) An illustrative example of a user session as displayed on the MONICA app.</p>
Full article ">Figure 28
<p>A schematic representation of the data flow in a mobile application scenario.</p>
Full article ">Figure 29
<p>The workflow performed in the Air-Heritage project.</p>
Full article ">Figure 30
<p>Site suitability map for networks of low-cost traffic-orientated stations for air pollutant monitoring across the city of Portici.</p>
Full article ">Figure 31
<p>Map of one of the optimal locations (red triangle within the red circle), with the related geographical coordinates (marked in red in the table) and the image of the mounted pole where NOx and PM<sub>2.5</sub> sensors have to be installed.</p>
Full article ">Figure 32
<p>Maps of the mobile monitoring campaigns along the selected monitoring route.</p>
Full article ">Figure 33
<p>Comparison between MONICA (blue line) and SIRANE (orange line), for CO pollutant on 5 and 21 June. Triangles are street canyons and circles are open roads. The ID receptors are grouped by monitoring road segments. The graphs (<b>a</b>,<b>c</b>,<b>e</b>) show the comparisons at 9 a.m., 1 p.m. and 5 p.m. on 5 June while the graphs (<b>b</b>,<b>d</b>,<b>f</b>) show the comparison at 9 a.m., 1 p.m. and 5 p.m. on 21 June.</p>
Full article ">Figure 34
<p>Maps of the PM<sub>2.5</sub> measurement density for each 25 m bin in summer (<b>a</b>) and winter campaigns (<b>b</b>).</p>
Full article ">Figure 35
<p>Maps of the distribution (median value) of the recorded PM<sub>2.5</sub> concentrations within the 25 m bins in summer (<b>a</b>) and winter campaigns (<b>b</b>).</p>
Full article ">
15 pages, 4778 KiB  
Article
Predicting Ride-Hailing Demand with Consideration of Social Equity: A Case Study of Chengdu
by Xinran Chen, Meiting Tu, Dominique Gruyer and Tongtong Shi
Sustainability 2024, 16(22), 9772; https://doi.org/10.3390/su16229772 - 8 Nov 2024
Viewed by 510
Abstract
In the realm of shared autonomous vehicle ride-sharing, precise demand prediction is vital for optimizing resource allocation, improving travel efficiency, and promoting sustainable transport solutions. However, existing studies tend to overlook social attributes and demographic characteristics across various regions, resulting in disparities in [...] Read more.
In the realm of shared autonomous vehicle ride-sharing, precise demand prediction is vital for optimizing resource allocation, improving travel efficiency, and promoting sustainable transport solutions. However, existing studies tend to overlook social attributes and demographic characteristics across various regions, resulting in disparities in prediction fairness between areas with plentiful and limited transportation resources. In order to achieve more accurate and fair prediction, an innovative Social Graph Convolution Long Short-Term Memory framework is proposed, incorporating demographic, spatial, and transportation accessibility information into multiple functional graphs, including functional similarity, population structure, and historical demand graphs. Furthermore, Mean Percentage Error indicators are employed in the loss function to balance prediction accuracy and fairness. The findings indicate that there is an enhancement in both prediction accuracy and fairness by at least 8.9% and 12.9%, respectively, compared to base models. Additionally, the predictions for rush hours in both privileged and underprivileged regions exhibit greater precision and rationality, supporting sustainable transport practices. The proposed framework effectively captures the demands of diverse social groups, thereby contributing to the advancement of social equity and long-term sustainability in urban mobility. Full article
Show Figures

Figure 1

Figure 1
<p>Architecture of SGC-LSTM.</p>
Full article ">Figure 2
<p>Construction of OD graphs.</p>
Full article ">Figure 3
<p>Hour-by-hour orders on weekdays vs. weekends.</p>
Full article ">Figure 4
<p>Order time duration violin chart.</p>
Full article ">Figure 5
<p>Heat map of OD orders.</p>
Full article ">Figure 6
<p>Fitted curves of SGC-LSTM for all areas in peak hours.</p>
Full article ">Figure 7
<p>Comparison results of algorithms for high and low accessibility areas.</p>
Full article ">
20 pages, 2027 KiB  
Review
Exploring Metabolic Mechanisms in Calcific Tendinopathy and Shoulder Arthrofibrosis: Insights and Therapeutic Implications
by Shahenvaz Alam, Marisa Shauna Sargeant, Ronak Patel and Prathap Jayaram
J. Clin. Med. 2024, 13(22), 6641; https://doi.org/10.3390/jcm13226641 - 5 Nov 2024
Viewed by 531
Abstract
Rotator cuff calcific tendinopathy and arthrofibrosis of the shoulder (adhesive capsulitis) are debilitating musculoskeletal disorders that significantly impact joint function and impair quality of life. Despite its high prevalence and common clinical presentation, the metabolic mechanisms underlying these conditions characterized by pain, and [...] Read more.
Rotator cuff calcific tendinopathy and arthrofibrosis of the shoulder (adhesive capsulitis) are debilitating musculoskeletal disorders that significantly impact joint function and impair quality of life. Despite its high prevalence and common clinical presentation, the metabolic mechanisms underlying these conditions characterized by pain, and reduced mobility, remain poorly understood. This review aims to elucidate the role of metabolic processes implicated in the pathogenesis of calcific tendinopathy and shoulder arthrofibrosis. We will be focusing on the mechanistic role of how these processes contribute to disease progression and can direct potential therapeutic targets. Calcific tendinopathy is marked by aberrant calcium deposition within tendons, influenced by disrupted calcium and phosphate homeostasis, and altered cellular responses. Key molecular pathways, including bone morphogenetic proteins (BMPs), Wnt signaling, and transforming growth factor-beta (TGF-β), play crucial roles in the pathophysiology of calcification, calcium imbalance, and muscle fibrosis. In contrast, shoulder arthrofibrosis involves excessive collagen deposition and fibrosis within the shoulder joint capsule, driven by metabolic dysregulation and inflammation. The TGF-β signaling pathway and inflammatory cytokines, such as interleukin-6 (IL-6), are central to the fibrotic response. A comparative analysis reveals both shared and distinct metabolic pathways between these conditions, highlighting the interplay between inflammation, cellular metabolism, extracellular matrix remodeling, calcific deposition, and calcium migration to the glenohumeral joints, resulting in adhesive capsulitis, thereby providing insights into their pathophysiology. This review discusses current therapeutic approaches and their limitations, advocating for the development of targeted therapies that address specific metabolic dysregulations. Future therapeutic strategies focus on developing targeted interventions that address the underlying metabolic dysregulation, aiming to improve patient outcomes and advance clinical management. This review offers a comprehensive overview of the metabolic mechanisms involved in calcific tendinopathy and shoulder arthrofibrosis, providing a foundation for future research and therapeutic development. Full article
(This article belongs to the Section Orthopedics)
Show Figures

Figure 1

Figure 1
<p>The three phases of calcific deposition in rotator cuff due to injury/inflammation; Phase I mainly shows pre-calcific phase where inflammation leads to recruitment of pro-inflammatory cytokines and replacement of tenocytes to chondrocytes; Phase II is referred to as the resting phase, during which calcific depositions form at the injury site, leading to a cessation of inflammation from Phase I. In Phase III, the presence of severe pain characterizes the phase, but eventually, the pain subsides as calcific deposits are resorbed. This process occurs through cell-mediated phagocytosis facilitated by macrophages, followed by the replacement of damaged tissue with healthy tissue. The figure was created using Servier Medical Art, licensed under a Creative Commons Attribution 4.0 License. <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a> (accessed on 21 October 2024).</p>
Full article ">Figure 2
<p>Summary of the similarities and potential differences between rotator cuff calcific tendinopathy and shoulder arthrofibrosis (adhesive capsulitis).</p>
Full article ">Figure 3
<p>Illustration of common contraction mechanism in skeletal muscle where the following processes occur: 1. transmission of impulses through voltage channels results in the activation of DHPR receptors; 2. DHPR receptors in sarcolemma tubules make conformational changes and transmit the impulses to the Ryanodine receptor (RyR); 3. RyR opens the calcium ion influx from the sarcoplasmic membrane to the skeletal muscle; 4. calcium ions initiate muscle contraction; and 5. during the end of muscle contraction, calcium ions return to the sarcoplasmic membrane due to the Ca<sup>2+</sup>-ATPase pump (SERCA). The figure was created using Servier Medical Art, licensed under a Creative Commons Attribution 4.0 License. <a href="https://creativecommons.org/licenses/by/4.0/" target="_blank">https://creativecommons.org/licenses/by/4.0/</a> (accessed on 22 October 2024).</p>
Full article ">Figure 4
<p>The calcium dynamic is central to various metabolic pathways in the cellular homeostasis and activates certain downstream processes.</p>
Full article ">
21 pages, 3008 KiB  
Article
Accessibility Measures to Evaluate Public Transport Competitiveness: The Case of Rome and Turin
by Alessandro Zini, Roberta Roberto, Patrizia Corrias, Bruna Felici and Michel Noussan
Smart Cities 2024, 7(6), 3334-3354; https://doi.org/10.3390/smartcities7060129 - 2 Nov 2024
Viewed by 565
Abstract
The transport sector worldwide relies heavily on oil products, and private cars account for the largest share of passenger mobility in several countries. Public transport could represent an interesting alternative under many perspectives, including a decrease in traffic, pollutants, and climate emissions. However, [...] Read more.
The transport sector worldwide relies heavily on oil products, and private cars account for the largest share of passenger mobility in several countries. Public transport could represent an interesting alternative under many perspectives, including a decrease in traffic, pollutants, and climate emissions. However, for public transport to succeed, it should be attractive for final users, representing a viable alternative to private mobility. In this work, we analyse the spatial distribution of public transport service provision within two metropolitan cities, considering the three key dimensions of mobility, competitiveness, and accessibility of public transport. The results show that private car performs better than public transport in all scopes considered, and that performance indicators are highly variable among city areas, indicating inequalities in social and environmental sustainability in urban systems. The outcomes of the analysis provide interesting insights for policy makers and researchers that deal with similar topics, and can also be extended to other cities and countries. Full article
Show Figures

Figure 1

Figure 1
<p>Urban areas in Turin (<b>case a, left</b>) and Rome (<b>case b, right</b>).</p>
Full article ">Figure 2
<p>Mobility index (km<sup>2</sup>) of (<b>a</b>) car and (<b>b</b>) PT trips in the city of Turin—average isochrone area (at 07:00 on weekdays).</p>
Full article ">Figure 3
<p>Mobility index (km<sup>2</sup>) of (<b>a</b>) car and (<b>b</b>) PT trips by (<b>a</b>) car and (<b>b</b>) PT in the city of Rome (at 07:00 on weekdays).</p>
Full article ">Figure 4
<p>Competitiveness index of public versus car transport in (<b>a</b>) Turin and (<b>b</b>) Rome.</p>
Full article ">Figure 5
<p>Accessibility index of public transport in (<b>a</b>) Turin and (<b>b</b>) Rome.</p>
Full article ">Figure A1
<p>Mobility index (km<sup>2</sup>) of car trips in the city of Turin (at 07:00 on weekdays).</p>
Full article ">Figure A2
<p>Mobility index (km<sup>2</sup>) of TP trips in the city of Turin (at 07:00 on weekdays).</p>
Full article ">Figure A3
<p>Competitiveness index in the city of Turin (at 07:00 on weekdays).</p>
Full article ">Figure A4
<p>Accessibility index in the city of Turin (at 07:00 on weekdays).</p>
Full article ">Figure A5
<p>Mobility index of car trips in the city of Rome (at 07:00 on weekdays).</p>
Full article ">Figure A6
<p>Mobility index of TP trips in the city of Rome (at 07:00 on weekdays).</p>
Full article ">Figure A7
<p>Competitiveness index in the city of Rome (at 07:00 on weekdays).</p>
Full article ">Figure A8
<p>Accessibility index in the city of Rome (at 07:00 on weekdays).</p>
Full article ">
22 pages, 765 KiB  
Article
A Federated Reinforcement Learning Framework via a Committee Mechanism for Resource Management in 5G Networks
by Jaewon Jeong and Joohyung Lee
Sensors 2024, 24(21), 7031; https://doi.org/10.3390/s24217031 - 31 Oct 2024
Viewed by 498
Abstract
This paper proposes a novel decentralized federated reinforcement learning (DFRL) framework that integrates deep reinforcement learning (DRL) with decentralized federated learning (DFL). The DFRL framework boosts efficient virtual instance scaling in Mobile Edge Computing (MEC) environments for 5G core network automation. It enables [...] Read more.
This paper proposes a novel decentralized federated reinforcement learning (DFRL) framework that integrates deep reinforcement learning (DRL) with decentralized federated learning (DFL). The DFRL framework boosts efficient virtual instance scaling in Mobile Edge Computing (MEC) environments for 5G core network automation. It enables multiple MECs to collaboratively optimize resource allocation without centralized data sharing. In this framework, DRL agents in each MEC make local scaling decisions and exchange model parameters with other MECs, rather than sharing raw data. To enhance robustness against malicious server attacks, we employ a committee mechanism that monitors the DFL process and ensures reliable aggregation of local gradients. Extensive simulations were conducted to evaluate the proposed framework, demonstrating its ability to maintain cost-effective resource usage while significantly reducing blocking rates across diverse traffic conditions. Furthermore, the framework demonstrated strong resilience against adversarial MEC nodes, ensuring reliable operation and efficient resource management. These results validate the framework’s effectiveness in adaptive and efficient resource management, particularly in dynamic and varied network scenarios. Full article
(This article belongs to the Section Sensor Networks)
Show Figures

Figure 1

Figure 1
<p>Overall architecture of the proposed framework.</p>
Full article ">Figure 2
<p>The neural network for the policy <math display="inline"><semantics> <mi>π</mi> </semantics></math> takes the state as input and produces the action probabilities for that specific state. The connections correspond to the weights in <math display="inline"><semantics> <mi>θ</mi> </semantics></math>, and the nodes in the hidden layer apply a non-linear activation function.</p>
Full article ">Figure 3
<p>Proposed committee mechanism.</p>
Full article ">Figure 4
<p>Average reward with proposed DFRL framework.</p>
Full article ">Figure 5
<p>The value of <math display="inline"><semantics> <msubsup> <mi>λ</mi> <mi>t</mi> <mi>eval</mi> </msubsup> </semantics></math>.</p>
Full article ">Figure 6
<p>Scaling performance of proposed DFRL framework. (<b>a</b>) Pod count <math display="inline"><semantics> <msub> <mi>d</mi> <mi>on</mi> </msub> </semantics></math>. (<b>b</b>) Blocking rate <math display="inline"><semantics> <mover accent="true"> <mi>b</mi> <mo stretchy="false">^</mo> </mover> </semantics></math>.</p>
Full article ">Figure 7
<p>Mean reward results using a different distribution of arrival rate.</p>
Full article ">Figure 8
<p>Boxplot showing the distribution of mean rewards across different committee and aggregator ratio. The boxes represent the interquartile range (IQR), with the median indicated by the horizontal line inside each box. Whiskers extend to 1.5 times the IQR. (<b>a</b>) Different committee ratio. (<b>b</b>) Different aggregator ratio.</p>
Full article ">Figure 9
<p>Boxplot showing the distribution of mean rewards across different malicious MEC ratios compared with committee-based and non-committee-based DFRL frameworks.</p>
Full article ">
18 pages, 722 KiB  
Article
Multi-Agent Deep Reinforcement Learning for Blockchain-Based Energy Trading in Decentralized Electric Vehicle Charger-Sharing Networks
by Yinjie Han, Jingyi Meng and Zihang Luo
Electronics 2024, 13(21), 4235; https://doi.org/10.3390/electronics13214235 - 29 Oct 2024
Viewed by 468
Abstract
With The integration of renewable energy sources into smart grids and electric vehicle (EV) charger-sharing networks is essential for achieving the goal of environmental sustainability. However, the uneven distribution of distributed energy trading among EVs, fixed charging stations (FCSs), and mobile charging stations [...] Read more.
With The integration of renewable energy sources into smart grids and electric vehicle (EV) charger-sharing networks is essential for achieving the goal of environmental sustainability. However, the uneven distribution of distributed energy trading among EVs, fixed charging stations (FCSs), and mobile charging stations (MCSs) introduces challenges such as inadequate supply at FCSs and prolonged latencies at MCSs. In this paper, we propose a multi-agent deep reinforcement learning (MADRL)-based auction algorithm for energy trading that effectively balances charger supply with energy demand in distributed EV charging markets, while also reducing total charging latency. Specifically, this involves a MADRL-based hierarchical auction that dynamically adapts to real-time conditions, optimizing the balance of supply and demand. During energy trading, each EV, acting as a learning agent, can refine its bidding strategy to participate in various local energy trading markets, thus enhancing both individual utility and global social welfare. Furthermore, we design a cross-chain scheme to securely record and verify transaction results of energy trading in decentralized EV charger-sharing networks to ensure integrity and transparency. Finally, experimental results show that the proposed algorithm significantly outperforms both the second-price and double auctions in increasing global social welfare and reducing total charging latency. Full article
(This article belongs to the Special Issue Network Security Management in Heterogeneous Networks)
Show Figures

Figure 1

Figure 1
<p>Blockchain-based energy trading in distributed EV charger-sharing networks, where each local market maintains its blockchain.</p>
Full article ">Figure 2
<p>The workflow of the MADRL-based energy trading algorithm.</p>
Full article ">Figure 3
<p>The data distribution of energy demands, charging time, and distance in the dataset. (<b>a</b>) Energy demands. (<b>b</b>) Charging time. (<b>c</b>) Distance.</p>
Full article ">Figure 4
<p>The distribution of valuation of buyers and sellers.</p>
Full article ">Figure 5
<p>Convergence analysis of the proposed learning-based mechanism under different sizes of EV charging markets. (<b>a</b>) Market size = 20. (<b>b</b>) Market size = 40. (<b>c</b>) Market size = 60. (<b>d</b>) Market size = 80.</p>
Full article ">Figure 6
<p>Performance comparison of the proposed learning-based mechanism under different sizes of EV charging markets. (<b>a</b>) Reward. (<b>b</b>) Social welfare. (<b>c</b>) Budget cost. (<b>d</b>) Charging latency.</p>
Full article ">
53 pages, 2271 KiB  
Review
Exploring Smart Mobility Potential in Kinshasa (DR-Congo) as a Contribution to Mastering Traffic Congestion and Improving Road Safety: A Comprehensive Feasibility Assessment
by Antoine Kazadi Kayisu, Miroslava Mikusova, Pitshou Ntambu Bokoro and Kyandoghere Kyamakya
Sustainability 2024, 16(21), 9371; https://doi.org/10.3390/su16219371 - 29 Oct 2024
Viewed by 854
Abstract
The urban landscape of Kinshasa, Democratic Republic of Congo, faces significant mobility challenges, primarily stemming from rapid urbanization, overpopulation, and outdated infrastructure. These challenges necessitate the exploration of modern smart mobility concepts to improve traffic flow, road safety, and sustainability. This study investigates [...] Read more.
The urban landscape of Kinshasa, Democratic Republic of Congo, faces significant mobility challenges, primarily stemming from rapid urbanization, overpopulation, and outdated infrastructure. These challenges necessitate the exploration of modern smart mobility concepts to improve traffic flow, road safety, and sustainability. This study investigates the potential of solutions such as Mobility-as-a-Service, car sharing, micro-mobility, Vehicle-as-a-Service, and electric vehicles in addressing these challenges. Through a comparative analysis of global implementations, this research identifies key success factors and barriers that inform the feasibility of integrating these solutions into Kinshasa’s unique socio-political and infrastructural context. The study presents a conceptual framework, supported by stakeholder analysis, for adapting these solutions locally. A detailed feasibility analysis considers technological, economic, social, environmental, and regulatory factors, offering a clear roadmap for implementation. Drawing on lessons from cities facing similar urban mobility challenges, the paper concludes with actionable recommendations and insights for policymakers and urban planners in Kinshasa. This research not only highlights the viability of smart mobility solutions in Kinshasa but also contributes to the broader discourse on sustainable urban development in rapidly growing cities. While smart mobility studies have largely focused on cities with developed infrastructure, there is a gap in understanding how these solutions apply to cities like Kinshasa with different infrastructural and socio-political contexts. Previous research has often overlooked the challenges of integrating smart mobility in rapidly urbanizing cities with underdeveloped transportation systems and financial constraints. This study fills that gap by offering a feasibility analysis tailored to Kinshasa, assessing smart mobility solutions for its traffic congestion and road safety issues. The smart mobility solutions studied—Mobility-as-a-Service (MaaS), car sharing, electric vehicles (EVs), and micro-mobility—were chosen for their ability to address Kinshasa’s key mobility challenges. MaaS reduces reliance on private vehicles, easing congestion and improving public transport. Car sharing offers affordable alternatives to vehicle ownership, essential in a city with income inequality. EVs align with sustainability goals by reducing emissions, while micro-mobility (bikes and e-scooters) improves last-mile connectivity, addressing public transit gaps. These solutions are adaptable to Kinshasa’s context and offer scalable, sustainable improvements for urban mobility. Full article
(This article belongs to the Special Issue Towards Safe Horizons: Redefining Mobility in Future Transport)
Show Figures

Figure 1

Figure 1
<p>A simplified representation of the Mobility-as-a-Service concept.</p>
Full article ">Figure 2
<p>A simplified representation of the car-sharing concept.</p>
Full article ">Figure 3
<p>Electric vehicle characteristics compared to traditional combustion vehicles.</p>
Full article ">Figure 4
<p>The most common 1- and 2-wheeled micro-mobility vehicles.</p>
Full article ">Figure 5
<p>Schematic overview of a Vehicle-as-a-Service concept.</p>
Full article ">Figure 6
<p>Research design for smart mobility integration into an existing transport system.</p>
Full article ">
17 pages, 1614 KiB  
Article
Evaluating a Reference Model for SAV in Urban Areas
by Antonio Reis Pereira, Pedro Portela, Marta Bicho and Miguel Mira da Silva
World Electr. Veh. J. 2024, 15(11), 491; https://doi.org/10.3390/wevj15110491 - 28 Oct 2024
Viewed by 570
Abstract
Previous work presented a reference model for shared autonomous vehicles in urban areas supported by a systematic literature review and topic modeling. The proposed reference model was then evaluated with two real-world demonstrations: the service provided by Waymo in Phoenix and another offered [...] Read more.
Previous work presented a reference model for shared autonomous vehicles in urban areas supported by a systematic literature review and topic modeling. The proposed reference model was then evaluated with two real-world demonstrations: the service provided by Waymo in Phoenix and another offered by Baidu in Beijing. In this paper, we present another evaluation based on a survey conducted with a group of potential stakeholders belonging to the mobility industry who were asked about their agreement with each of the concepts in the reference model. The resulting artifact is stronger and more reliable because it reflects the feedback of mobility experts. Full article
Show Figures

Figure 1

Figure 1
<p>Survey—Respondents’ data.</p>
Full article ">Figure 2
<p>Survey—Concept validation.</p>
Full article ">Figure 3
<p>Survey respondents.</p>
Full article ">Figure 4
<p>Updated reference model.</p>
Full article ">
15 pages, 2671 KiB  
Article
Reconfigurable Frequency Response Masking Multi-MAC Filters for Software Defined Radio Channelization
by Subahar Arivalagan, Britto Pari James and Man-Fai Leung
Electronics 2024, 13(21), 4211; https://doi.org/10.3390/electronics13214211 - 27 Oct 2024
Viewed by 457
Abstract
Mobile technology is currently trending toward supporting multiple communication standards on a single device. This means that some reconfigurable techniques must be the foundation of their design. The two essential requirements of channel filters are minimized complexity and reconfigurability. In this research, a [...] Read more.
Mobile technology is currently trending toward supporting multiple communication standards on a single device. This means that some reconfigurable techniques must be the foundation of their design. The two essential requirements of channel filters are minimized complexity and reconfigurability. In this research, a novel extension of Frequency Response Masking (FRM) was investigated by employing Time Division Multiplexing (TDM)-based single Multiply and Accumulate (MAC) architecture using the principle of resource sharing to realize multiple sharp filter responses from a single prototype constant group delay low pass filter. This paper uses a single multiply and add units regardless of the quantity of channels and taps. The suggested reconfigurable filter was synthesized on technology based on 0.18-µm CMOS and put into practice. Further trials were carried out on Virtex-II 2v3000ff1152-4 FPGA device. The outcomes revealed that the suggested channel filter, which was synthesized using FPGA, provides 21.36% of the area curtail and 14.88% of power scaling down on average and put into practice using ASIC provides 5.18% of the area reduction and 9.08% of power scaling down on average. Full article
Show Figures

Figure 1

Figure 1
<p>Design of FIR filter using the FRM technique.</p>
Full article ">Figure 2
<p>Illustration of the FRM approach’s frequency response.</p>
Full article ">Figure 3
<p>Single-channel MAC-based FIR filter.</p>
Full article ">Figure 4
<p>Design of the FIR filter using single MAC-based FRM technique.</p>
Full article ">Figure 5
<p>Multi-channel MAC-based FIR filter.</p>
Full article ">Figure 6
<p>Structure of complementary delays.</p>
Full article ">Figure 7
<p>Proposed Design of FIR filter using Multi-Channel MAC-based FRM technique.</p>
Full article ">Figure 8
<p>Waveform for simulation of multi-channel MAC FIR filter.</p>
Full article ">Figure 9
<p>RTL representation of FIR filter with Multi-Channel MAC.</p>
Full article ">
Back to TopTop