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Tumor otak adalah pertumbuhan jaringan abnormal yang ditandai dengan pertumbuhan sel yang berlebihan di bagian otak tertentu. Salah satu teknik andal saat ini yang tersedia untuk mengidentifikasi tumor otak adalah penggunaan pemindaian Magnetic Resonance Imaging (MRI). Gambar MRI yang dipindai dipantau dan diperiksa untuk deteksi tumor oleh dokter spesialis. Mengembangkan alat yang lebih efektif dan efisien untuk membantu profesional medis mengidentifikasi tumor otak dirasa cukup mendesak karena jumlah orang yang menderita tumor otak melonjak dan tingkat kematian yang mencapai 18.600 pada tahun 2021. Dalam penelitian sebelumnya, model berbasis pembelajaran mesin mampu menunjukkan kemampuan untuk mendeteksi tumor otak dengan akurasi klasifikasi 92% dan hal hasil ini dapat diandalkan. Untuk mendapatkan akurasi klasifikasi biner yang paling andal dalam gambar otak MRI, kami menguji secara komputasi beberapa hyperparameter menggunakan kumpulan data MRI yang tersedia untuk umum. Tingkat akurasi model yang tinggi dicapai dengan menguji berbagai arsitektur model machine learning yang ada, diikuti dengan memasukkan feature map yang diekstraksi dari Discrete Cosine Transform (DCT). Klasifikasi gambar MRI mencapai akurasi pada data test tertinggi sebesar 93% dengan menggunakan model Support Vector Machine (SVM).

Pneumonia is the leading cause of death from a single infection worldwide in children. A proven clinical method for diagnosing pneumonia is through a chest X-ray. However, the resulting X-ray images often need clarification, resulting in subjective judgments. In addition, the process of diagnosis requires a longer time. One technique can be applied by applying advanced deep learning, namely, Transfer Learning with Deep Convolutional Neural Network (Deep CNN) and modified Multilevel Meta Ensemble Learning using Softmax. The purpose of this research was to improve the accuracy of the pneumonia classification model. This study proposes a classification model with a meta-ensemble approach using five classification algorithms: Xception, Resnet 15V2, InceptionV3, VGG16, and VGG19. The ensemble stage used two different concepts, where the first level ensemble combined the output of the Xception, ResNet15V2, and InceptionV3 algorithms. Then the output from the first ensemble level is reused for the following learning process, combined with the output from other algorithms, namely VGG16 and VGG19. This process is called ensemble level two. The classification algorithm used at this stage is the same as the previous stage, using KNN as a classification model. Based on experiments, the model proposed in this study has better accuracy than the others, with a test accuracy value of 98.272%. The benefit of this research could help doctors as a recommendation tool to make more accurate and timely diagnoses, thus speeding up the treatment process and reducing the risk of complications.

The problem of the spread of COVID-19 (SARS-CoV-2) is spreading fleetly and worldwide. Beforehand discovery and opinion of complaint is veritably important to ensure the right remedy so that it needs to be enforced through various practical approaches. In former studies, complaint discovery through medical imaging has started to appear and get a good delicacy of around 80 to 90 percent using machine learning. In the deep learning era, some trials get better accuracy of 95 percent using the traditional deep learning approach. Now, deep learning has developed more fleetly, especially for image classification. therefore, it's necessary to experiment with a pretrained model approach to medical images. In addition, the fine tuning approach will also be an aspect of the approach that will be carried out in this trial to be compared and to find out its effect, specifically on CT-Scan images of the lungs for the discovery of COVID 19. The results of this experiment showed that the pretrained model approach can get high accuracy. Relatively high accuracy, the smallest testing accuracy in this trial reached 94.78 percent of the Xception without fine tuning phase, this result has beaten the machine learning approach which is didn't reach 90 percent of accuracy. The best experiment testing accuracy get 97.59 percet on the VGG 16 by applying fine tuning. The results of this trial also show that the fine tuning stage (for the top 10th layers) can increase the accuracy of the model.