Brain cancer classification is an important step that depends on the physician's knowledge and experience. An automated tumor classification system is very essential to support radiologists and physicians to identify brain tumors. However, the accuracy of current systems needs to be improved for suitable treatments. In this paper, we propose a hybrid feature extraction method with a regularized extreme learning machine (RELM) for developing an accurate brain tumor classification approach. The approach starts by preprocessing the brain images by using a min-max normalization rule to enhance the contrast of brain edges and regions. Then, the brain tumor features are extracted based on a hybrid method of feature extraction. Finally, a RELM is used for classifying the type of brain tumor. To evaluate and compare the proposed approach, a set of experiments is conducted on a new public dataset of brain images. The experimental results proved that the approach is more effective compared with the existing state-of-the-art approaches, and the performance in terms of classification accuracy improved from 91.51% to 94.233% for the experiment of the random holdout technique.INDEX TERMS Brain tumor classification, hybrid feature extraction, NGIST features, PCA, regularized extreme learning machine.

The network intrusion detection system is an important tool for protecting computer networks against threats and malicious attacks. Many techniques have recently been proposed; however, these face significant challenges due to the continuous emergence of new threats that are not recognized by existing systems. In this paper, we propose a novel two-stage deep learning (TSDL) model, based on a stacked auto-encoder with a soft-max classifier, for efficient network intrusion detection. The model comprises two decision stages: an initial stage responsible for classifying network traffic as normal or abnormal, using a probability score value. This is then used in the final decision stage as an additional feature, for detecting the normal state and other classes of attacks. The proposed model is able to learn useful feature representations from large amounts of unlabeled data and classifies them automatically and efficiently. To evaluate its effectiveness, several experiments are conducted on two public datasets, specifically the benchmark KDD99 and UNSW-NB15 datasets. Comparative simulation results demonstrate that our proposed model significantly outperforms existing approaches, achieving high recognition rates, up to 99.996% and 89.134%, for the KDD99 and UNSW-NB15 datasets respectively. We conclude that our model has the potential to serve as a future benchmark for the deep learning and network security research communities. INDEX TERMS Computational intelligence, two-stage deep learning model, feature representation, network intrusion detection, stacked auto-encoder.

Highlights Educational institutes worldwide are facing closure owing to SARS-CoV-2 pandemic. Online mode of learning is adopted by institutes worldwide. We compared access & use of online learning among Bruneians and Pakistanis. Bruneian are more satisfied with online learning as compared to Pakistanis.

In recent years, computation offloading has become an effective way to overcome the constraints of mobile devices (MDs) by offloading delay-sensitive and computation-intensive mobile application tasks to remote cloud-based data centers. Smart cities can benefit from offloading to edge points in the framework of the so-called cyber-physical-social systems (CPSS), as for example in traffic violation tracking cameras. We assume that there are mobile edge computing networks (MECNs) in more than one region, and they consist of multiple access points, multi-edge servers, and N MDs, where each MD has M independent real-time massive tasks. The MDs can connect to a MECN through the access points or the mobile network. Each task be can processed locally by the MD itself or remotely. There are three offloading options: nearest edge server, adjacent edge server, and remote cloud. We propose a reinforcementlearning-based state-action-reward-state-action (RL-SARSA) algorithm to resolve the resource management problem in the edge server, and make the optimal offloading decision for minimizing system cost, including energy consumption and computing time delay. We call this method OD-SARSA (offloading decision-based SARSA). We compared our proposed method with reinforcement learning based Q learning (RL-QL), and it is concluded that the performance of the former is superior to that of the latter. INDEX TERMS Mobile devices, edge computing, mobile edge computing, edge cloud computing, virtual machines, access points.

No abstract