The innovations of wireless and machine-to-machine (M2M) technologies have led to the proliferation of many Internets of Things (IoT) devices. In a conventional cloud based IoT system, vast amounts of data generated from devices are processed, analyzed, and stored in a central Cloud Server (CS). However, the increasing number of devices, and the accompanying and growing vast device data strain the CS, leading to scalability issues. This results in performance degradation i.e., longer execution time, high energy consumption and low throughput. Studies show that Collaborative Edge-Cloud Computing (CECC) has the potential to enhance system scalability and performance. In this work, we study and contribute to CECC research by proposing a method to enhance scalability and performance. First, the CSs are made almost fully utilized with the device data. Then, computations, and precisely the device data are distributed among the Edge Servers (ESs) and CSs, and performance is assessed to obtain the optimal pairing of computations. Finally, additional devices are added, and data are allocated to the CS to assess scalability, and performance. An IoT system with 30 devices of five different types distributed to 10 edges, two ESs and one CS, is modeled and simulated using VisualSim. Experimental results show that the proposed method enhances the system ability to process additional device data generated from either 8 of type-1, 2 and 3 devices, or 16 of type-4 device, or 32 of type-5 device. It also helps to reduce execution time and energy consumption by 74% and 17% respectively. This method has also the potential to benefit different scheduling algorithms, machine learning, and federated learning technologies.

Processing large amount of data with many input features is always time consuming and expensive. In machine learning (ML), the number of input features play a crucial role in determining the performance of the ML models. Studies show that ML has potential for dimensionality reduction. This work proposes a methodology to reduce the number of input features using ML to facilitate cost-effective data analysis. Two different data sets for water quality prediction from Kaggle are used to run the ML models. First, we use Recursive Feature Elimination with Cross-Validation (RFECV), Permutation Importance (PI), and Random Forest (RF) models to find the impact of input features on predicting water quality. Second, we conduct experiments applying seven ML models: RF, Decision Tree (DT), Logistic Regression (LR), K-Nearest Neighbors (KNN), Gaussian Naïve Bayes (GNB), Support Vector Machine (SVM), and Deep Neural Network (DNN) to explore water quality using the original and reduced datasets. Third, we evaluate the impact of the optimized data features on computations and cost to test water quality. Experimental results show that reducing the number of features from nine to five for Dataset 1 helps reduce computations by up to 59% and cost up to 65%. Similarly, reducing the number of features from 20 to 16 for Dataset 2 helps reduce computations by up to 20% and cost up to 14%. This study may help mitigate the curse of dimensionality, via improving the performance of ML models by enhancing data generalization.

Conventional computer-aided diagnosis (CADx) systems play a crucial role in assisting medical professionals with the detection of skin diseases. However, these systems often involve manual, time-consuming, and error-prone processes. Recent studies show that machine learning models have potential to improve the accuracy of CADx systems. In this work, we present research findings aimed at improving the performance of CADx systems for detecting skin diseases by applying ensemble machine learning models. The investigation encompasses the exploration of three popular classification methods: linear discriminant analysis (LDA), support vector machine (SVM), and convolutional neural network (CNN); and an ensemble model of CNN with SVM. The HAM10000 dataset from Kaggle is used to train and test all classification models. Resampling is employed to address class imbalance in the dataset. Through rigorous experiments, the results highlight the compelling efficacy of the ensemble CNNSVM model, unveiling heightened accuracy up to 92% (from CNN accuracy 85% and SVM accuracy 83%). The outcome of this work has profound implications for artificial intelligence (AI) accelerated medical domains in advancing the accuracy and efficiency of skin disease treatment.

Multicore architecture featuring wireless network-on-chip (WNoC) has emerged as a promising solution to meet the increasing demand for performance and power efficiency. However, the frequent utilization of cores to accomplish computational and communication objectives often leads to significant heat generation within multicore processors. This excessive heat poses the risk of overheating and potential malfunction of the processor chip. Multicore WNoC systems, whether with uniform or non-uniform subnets, often suffer from inefficient core utilization, which can result in decreased performance, localized overheating, and reduced processor chip lifespan. In this study, we propose a dynamic job scheduling methodology combined with the least used core selection to enhance performance and achieve even heat distribution across multicore WNoC chips. The proposed method employs the shortest remaining job first (SRJF) algorithm to select jobs and the least recently used (LRU) algorithm to select cores for ensuring even time distribution for equal heat dissipation while maximizing resource utilization. We simulate a 49-core 7x7 WNoC utilizing 1-hop (where a core needs only one hop to reach the nearest wireless router), 2-hop, and 3-hop organizations. Simulation programs are executed using a representative workload consisting of 92 jobs to evaluate the effectiveness of the proposed method. Our simulation results demonstrate how the communication latency and power consumption are impacted by the number of wireless routers. Also, it is observed that the proposed method effectively achieves balanced heat distribution across the WNoC. The 2-hop WNoC emerges as the optimal WNoC, achieving a 57% reduction in wireless routers compared to the 1-hop architecture, along with latency reductions of 9% and 14%, and power consumption reductions of 18% and 25% compared to the 3-hop and non-uniform configurations, respectively.