scholarly journals A self-supervised learning strategy for postoperative brain cavity segmentation simulating resections

2021 ◽  
Author(s):  
Fernando Pérez-García ◽  
Reuben Dorent ◽  
Michele Rizzi ◽  
Francesco Cardinale ◽  
Valerio Frazzini ◽  
...  
Keyword(s):  
Supervised Learning ◽  
Learning Strategies ◽  
Learning Strategy ◽  
Simulation Method ◽  
Magnetic Resonance Images ◽  
Fine Tuning ◽  
Postoperative Mri ◽  
Preoperative Magnetic Resonance ◽  
3D Cnn

Abstract Purpose Accurate segmentation of brain resection cavities (RCs) aids in postoperative analysis and determining follow-up treatment. Convolutional neural networks (CNNs) are the state-of-the-art image segmentation technique, but require large annotated datasets for training. Annotation of 3D medical images is time-consuming, requires highly trained raters and may suffer from high inter-rater variability. Self-supervised learning strategies can leverage unlabeled data for training. Methods We developed an algorithm to simulate resections from preoperative magnetic resonance images (MRIs). We performed self-supervised training of a 3D CNN for RC segmentation using our simulation method. We curated EPISURG, a dataset comprising 430 postoperative and 268 preoperative MRIs from 430 refractory epilepsy patients who underwent resective neurosurgery. We fine-tuned our model on three small annotated datasets from different institutions and on the annotated images in EPISURG, comprising 20, 33, 19 and 133 subjects. Results The model trained on data with simulated resections obtained median (interquartile range) Dice score coefficients (DSCs) of 81.7 (16.4), 82.4 (36.4), 74.9 (24.2) and 80.5 (18.7) for each of the four datasets. After fine-tuning, DSCs were 89.2 (13.3), 84.1 (19.8), 80.2 (20.1) and 85.2 (10.8). For comparison, inter-rater agreement between human annotators from our previous study was 84.0 (9.9). Conclusion We present a self-supervised learning strategy for 3D CNNs using simulated RCs to accurately segment real RCs on postoperative MRI. Our method generalizes well to data from different institutions, pathologies and modalities. Source code, segmentation models and the EPISURG dataset are available at https://github.com/fepegar/resseg-ijcars.

scholarly journals MENINGKATKAN AKTIVITAS BELAJAR SISWA DALAM MATA PELAJARAN PKN MELALUI STRATEGI PEMBELAJARAN METODE SIMULASI GAME PADA SISWA KELAS VIII B DI SMPN 2 MANDASTANA KECAMATAN JEJANGKIT KABUPATEN BARITO KUALA

Jurnal Socius ◽  
2016 ◽  
Vol 5 (2) ◽  
Author(s):  
Khairunnisa Khairunnisa
Keyword(s):  
Student Learning ◽  
Learning Outcomes ◽  
Learning Strategies ◽  
Junior High School ◽  
Learning Strategy ◽  
Simulation Method ◽  
Student Learning Outcomes ◽  
Civics Education ◽  
The Subject ◽  
Game Simulation

Activities and student learning outcomes is low. This study aimed to describe the activity and student learning outcomes VIIIB class SMP Negeri 2 Mandastana on the subject of Pancasila as the State Ideology and can be enhanced through learning strategies Simulation method. This research method is qualitative analysis methods, emphasis on deepening the subject matter of the activities and results of student learning in Civics. So it can be identified and analyzed the problems that arise and then held reflection to look for alternative. Study began in June 2011 to October 2011, the number of samples of 26 people from VIIIB grade students. The results showed that: (1) learning activities Civics class students VIIIB SMP Negeri 2 Mandastana during use learning strategies Simulations increases, (2) the results of learning civics class students VIIIB Junior High School 2 Mandastana during use learning strategies Simulations increases, (3) the students' responses VIIIB class SMP Negeri 2 Mandastana to use learning strategies Simulations. Implementation showed that students enjoy learning civics by implementing learning strategies should suggest Simulasi.Peneliti Civics teachers use learning strategies Simulations for appropriate materials, and are expected to use more cooperative learning strategies more attractive so that students actively in learning civics.Keywords: Learning outcomes, learning strategy game simulation, and civics education Aktivitas dan hasil belajar siswa rendah. Penelitian ini bertujuan untuk mendeskripsikan aktivitas dan hasil belajar siswa kelas VIIIB SMP Negeri 2 Mandastana pada pokok bahasan Pancasila Sebagai Ideologi dan Dasar Negara dapat ditingkatkan melalui strategi pembelajaran metode Simulasi.Metode penelitian ini adalah metode analisis kualitatif, menekankan pada pendalaman pokok permasalahan tentang aktivitas dan hasil belajar siswa pada mata pelajaran PKn. Sehingga bisa diketahui dan dianalisa permasalahan yang muncul dan kemudian diadakan refleksi untuk mencari alternatif pemecahannya.Proses penelitian dimulai pada bulan Juni 2011 sampai Oktober 2011, jumlah sampel 26 orang dari siswa kelas VIIIB. Hasil penelitian menunjukkan bahwa: (1) aktivitas belajar PKn siswa kelas VIIIB SMP Negeri 2 Mandastana selama menggunakan strategi pembelajaran Simulasi meningkat,(2) hasil belajar PKn siswa kelas VIIIB SMP negeri 2 Mandastana selama menggunakan strategi pembelajaran Simulasi meningkat,(3) respon siswa kelas VIIIB SMP Negeri 2 Mandastana terhadap penggunaan strategi pembelajaran Simulasi. Pelaksanaan menunjukkan bahwa siswa senang belajar PKn dengan menerapkan strategi pembelajaran Simulasi.Peneliti menyarankan hendaknya guru mata pelajaran PKn menggunakan strategi pembelajaran Simulasi untuk materi-materi yang sesuai, serta diharapkan dapat menggunakan strategi pembelajaran kooperatif lainnya yang lebih menarik agar siswa aktif dalam pembelajaran PKn.Kata Kunci:hasil belajar, Strategi Pembelajaran Game Simulasi dan PKn

scholarly journals Detection and Recognition of Ultrasound Breast Nodules Based on Semi-supervised deep learning

2020 ◽  
Author(s):  
Yanhua Gao ◽  
Bo Liu ◽  
Yuan Zhu ◽  
Lin Chen ◽  
Miao Tan ◽  
...  
Keyword(s):  
Deep Learning ◽  
Supervised Learning ◽  
Learning Strategies ◽  
Learning Strategy ◽  
Medical Images ◽  
Ultrasound Image ◽  
Ultrasound Images ◽  
Training Strategy ◽  
Supervised Training ◽  
Malignant Breast

AbstractBackgroundThe successful application of deep learning in medical images requires a large amount of annotation data for supervised training. However, massive labeling of medical data is expensive and time consuming. This paper proposes a semi-supervised deep learning method for the detection and classification of benign and malignant breast nodules in ultrasound images, which include two phases.MethodsThe nodule position in the ultrasound image is firstly detected using the faster RCNN network. Second, the recognition network is used to identify the benign and malignant types of nodules. The method in this paper uses a semi-supervised learning strategy, using 800 labeled nodules and 4396 unlabeled nodules.ResultsBased on mean teacher training strategy, the proposed semi-supervised network has obtained excellent results, which is similar to currently used with supervised training networks. On the two test data sets, the AUC of semi-supervised learning and supervised learning were: 93.7% vs 94.2% and 92% vs 92.3%.ConclusionsThe paper proves that semi-supervised learning strategies have good application potential in medical images. Based on a special learning strategy, the result of semi-supervised learning is expected to achieve close or even achieve similar result of supervised deep learning, which only need a small number of labeled samples and a large number of unlabeled samples. It means deep learning analysis of breast lesion will be more feasible and more efficient.

scholarly journals Pengaruh Strategi Pembelajaran Problem Based Learning (PBL) Dan Group Investigation (GI) Terhadap Keterampilan Proses Sains Di MAN Kabanjahe

2017 ◽  
Vol 6 (3) ◽  
Author(s):  
Iskandar Dinata Ginting ◽  
Ely Djulia ◽  
Tumiur Gultom
Keyword(s):  
Learning Strategies ◽  
Learning Strategy ◽  
Problem Based Learning ◽  
Sampling Technique ◽  
Class A ◽  
Skill Test ◽  
Class B ◽  
Control Learning ◽  
Cluster Random Sampling

This study aims to determine the effect of learning strategies on the skills of the science process. The research method used quasi experiment with research sample of 3 classes determined randomly with cluster random sampling technique. Class A is taught by Problem Based Learning strategy, class B with Group Investigation and Class C (Control) learning strategy using Conventional learning strategy. The research instrument uses a science skill test in the form of a description of the observation sheet. Data analysis techniques with Covariate Analysis (ANACOVA) at significant level α = 0.05 with the help of SPSS 24. The results showed there is a significant influence of learning strategy on science process skills (F = 9,229; P = 0,000). As a follow-up of the results of this study is expected to teachers to be able to implement Problem Based Learning (PBL) strategy on Ecology material in an effort to improve the skills of science process.

scholarly journals Strategi Pembelajaran Guru Pendidikan Agama Kristen Masa Pandemi Covid–19 di SMAN 1 Damang Batu

2021 ◽  
Vol 1 (2) ◽  
pp. 170-187
Author(s):  
Hendri Hendri
Keyword(s):  
Christian Education ◽  
Learning Strategies ◽  
Clinical Supervision ◽  
Learning Strategy ◽  
Work Motivation ◽  
Depth Interview ◽  
Teacher Work ◽  
Qualitative Descriptive ◽  
Descriptive Approach

  This research aims to describe the strategy of Christian Education teachers in carrying out learning in the covid-19 pandemic. This research method is qualitative research with a qualitative descriptive approach. The data collection techniques used are in-depth interview and documentation techniques. The results showed that the learning strategy used by PAK teachers in SMAN 1 Damang Batu is an expository learning strategy with components that include: introduction, information delivery, student participation, tests (evaluation), as well as KKM follow-up activities. Then, it was found that the efforts of the principal in assisting teachers in implementing learning strategies during the covid 19 pandemic, namely by increasing teacher work motivation, performance supervision, and clinical supervision. Penelitian ini bertujuan untuk mendeskripsikan strategi guru Pendidikan Agama Kristen dalam melaksanakan pembelajaran di masa pandemic covid-19. Metode penelitian ini adalah penelitian kualitatif dengan pendekatan deskriptif kualitatif. Teknik pengumpulan data yang digunakan adalah teknik wawancara mendalam dan dokumentasi. Hasil penelitian menunjukkan bahwa strategi pembelajaran yang digunakan guru PAK di SMAN 1 Damang Batu adalah strategi pembelajaran ekspositori dengan komponen-komponenyang meliputi: pendahuluan, penyampaian informasi, partisipasi peserta didik, tes (evaluasi), serta kegiatan lanjutan KKM. Kemudian, ditemukan upaya kepala sekolah dalam membantu guru dalam melaksanakan strategi pembelajaran dimasa pandemi covid 19 yaitu dengan peningkatan motivasi kerja guru, pengawasan kinerja, serta supervisi klinis.

scholarly journals Deep Learning Models for Automatic Makeup Detection

AI ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 497-511
Author(s):  
Theiab Alzahrani ◽  
Baidaa Al-Bander ◽  
Waleed Al-Nuaimy
Keyword(s):  
Deep Learning ◽  
Supervised Learning ◽  
Learning Strategies ◽  
Learning Strategy ◽  
Real Life ◽  
Estimation Methods ◽  
Learning Models ◽  
Unlabelled Data ◽  
Area Under Roc Curve ◽  
Computational Intelligence Methods

Makeup can disguise facial features, which results in degradation in the performance of many facial-related analysis systems, including face recognition, facial landmark characterisation, aesthetic quantification and automated age estimation methods. Thus, facial makeup is likely to directly affect several real-life applications such as cosmetology and virtual cosmetics recommendation systems, security and access control, and social interaction. In this work, we conduct a comparative study and design automated facial makeup detection systems leveraging multiple learning schemes from a single unconstrained photograph. We have investigated and studied the efficacy of deep learning models for makeup detection incorporating the use of transfer learning strategy with semi-supervised learning using labelled and unlabelled data. First, during the supervised learning, the VGG16 convolution neural network, pre-trained on a large dataset, is fine-tuned on makeup labelled data. Secondly, two unsupervised learning methods, which are self-learning and convolutional auto-encoder, are trained on unlabelled data and then incorporated with supervised learning during semi-supervised learning. Comprehensive experiments and comparative analysis have been conducted on 2479 labelled images and 446 unlabelled images collected from six challenging makeup datasets. The obtained results reveal that the convolutional auto-encoder merged with supervised learning gives the best makeup detection performance achieving an accuracy of 88.33% and area under ROC curve of 95.15%. The promising results obtained from conducted experiments reveal and reflect the efficiency of combining different learning strategies by harnessing labelled and unlabelled data. It would also be advantageous to the beauty industry to develop such computational intelligence methods.

scholarly journals STRATEGI PEMBELAJARAN NILAI-NILAI AGAMA DAN MORAL UNTUK MEMBENTUK KARAKTER RELIGIUS DAN MANDIRI DI RA TERPADU AL-MADINAH KECAMATAN BALONG KABUPATEN PONOROGO

2020 ◽  
Vol 1 (1) ◽  
pp. 63
Author(s):  
Sularmi Sularmi ◽  
Bambang Harmanto ◽  
Anip Dwi Saputro
Keyword(s):  
Learning Strategies ◽  
Learning Strategy ◽  
Participant Observation ◽  
Field Research ◽  
Moral Values ◽  
Report Cards ◽  
Data Source ◽  
Evaluation Of Learning ◽  
Learning Plans

The purpose of this study is 1.) To identify the planning of learning religious and moral values to form religious and independent characters in RA Integrated Al-Madinah Kec. Balong Kab. Ponorogo, 2.) To identify learning strategies of religious and moral values to form religious and independent characters in RA Integrated Al-Madinah Kec. Balong Kab. Ponorogo, 3.) To identify the evaluation of learning strategies of religious and moral values to form religious and independent characters in RA Integrated Al-Madinah Kec. Balong Kab. Ponorogo. The research method used by the type of field research with the data source is the speakers, seeing the events at the location, and doing documentation, data collection techniques with participant observation, interviews, and documentation. The results in this study are 1.) The teachers make learning plans in the form of semester programs, weekly programs and daily programs. 2.) Learning strategy for the head of RA to make policy by opening role classes and practical life, making report cards and giving examples to students. For teachers in making religious and independent character formation through habituation in learning. For parents to provide assistance to their children. 3.) Evaluation is carried out, namely conducting daily assessments, and making assessment reports and follow-up. One of the findings from the study shows that the involvement or participation of students in learning activities is influenced by the fforts of the teacher, the environment and habituation

STRATEGI PEMBELAJARAN DAN MOTIF BERPRESTASI TERHADAP HASIL BELAJAR MATA PELAJARAN MENGGAMBAR TEKNIK

2013 ◽  
Vol 6 (1) ◽  
Author(s):  
Timbul Purba ◽  
Harun Sitompul
Keyword(s):  
Student Learning ◽  
Learning Outcomes ◽  
Learning Strategies ◽  
Learning Strategy ◽  
Student Learning Outcomes ◽  
High Achievement ◽  
Low Achievement ◽  
Significance Level ◽  
Achievement Motive ◽  
Analysis Technique

Abstrak: Penelitian ini bertujuan: (1) hasil belajar menggambar teknik siswa yang diajar dengan strategi pembelajaran elaborasi lebih tinggi dibandingkan dengan siswa yang diajar dengan strategi pembelajaran ekspositori, (2) hasil belajar menggambar teknik siswa yang memiliki motif berprestasi tinggi lebih tinggi dibandingkan dengan siswa yang memiliki motif berprestasi rendah dan (3) interaksi antara strategi pembelajaran dengan motif berprestasi dalam mempengaruhi hasil belajar menggambar teknik siswa. Metode penelitian menggunakan metode quasi eksperimen dengan desain penelitian faktorial 2x2, sedangkan teknik analisis data menggunakan ANAVA dua jalur pada taraf signifikansi a = 0.05. Hasil penelitian diperoleh: (1) hasil belajar menggambar teknik siswa yang diajar dengan strategi pembelajaran elaborasi lebih tinggi dibandingkan dengan hasil belajar siswa yang diajar dengan strategi pembelajaran ekspositori, (2) hasil belajar menggambar teknik siswa yang memiliki motif berprestasi tinggi lebih tinggi dibandingkan dengan hasil belajar siswa yang memiliki motif berprestasi rendah dan (3) terdapat interaksi antara strategi pembelajaran dengan motif berprestasi dalam mempengaruhi hasil belajar menggambar teknik siswa.   Kata Kunci: strategi pembelajaran elaborasi dan ekspositori, motif berprestasi, hasil belajar menggambar teknik   Abstract: This research was aimed to: (1) the learning outcomes of students who are taught drawing techniques with learning strategy elaboration higher than students taught by expository learning strategy, (2) drawing techniques learning outcomes of students who have high achievement motive higher than students who have low achievement motive, and (3) the interaction between learning strategy and achievement motives in affecting student learning outcomes drawing techniques. The research method used was quasi experiment with 2 x 2 factorial design. The analysis technique used is the two-track analysis of variance ANOVA (2 x 2) with a significance level α = 0.05. The findings of the study indicate: (1) the learning outcomes of students who are taught drawing techniques with learning strategy elaboration higher learning outcomes than students taught by expository learning strategy; (2) drawing techniques learning outcomes of students who have high achievement motive higher than the learning outcomes of students who have low achievement motive; and (3) there is interaction between learning strategy and achievement motives in affecting student learning outcomes drawing techniques. Keywords: elaboration learning strategies and expository, achievement motive, the result of learning drawing techniques

PENGARUH STRATEGI PEMBELAJARAN DAN TIPE KEPRIBADIAN SISWA TERHADAP HASIL BELAJAR EKONOMI

2017 ◽  
Vol 10 (2) ◽  
pp. 151
Author(s):  
Harningsih Fitri Situmorang
Keyword(s):  
Learning Outcomes ◽  
Learning Strategies ◽  
Learning Strategy ◽  
Problem Based Learning ◽  
Personality Type ◽  
Student Learning Outcomes ◽  
Personality Types ◽  
Descriptive Statistics ◽  
Scheffe Test ◽  
Inferential Statistic

Abstrak: Penelitian ini bertujuan :(1) Untuk mengetahui hasil belajar ekonomi siswa yang diajar dengan strategi pembelajaran berbasis masalah lebih tinggi dari siswa yang diajar dengan strategi pembelajaran ekspositori. (2) Untuk mengetahui hasil belajar  ekonomi siswa yang memiliki tipe kepribadian ekstrovert dan siswa yang memiliki kepribadian introvert. (3) Untuk mengetahui interaksi antara strategi pembelajaran dengan tipe kepribadian  terhadap hasil belajar Ekonomi. Metode penelitian yang digunakan adalah kuasi eksperimen dengan desain faktorial 2 x 2. Uji statistik yang digunakan adalah statistik deskriptif untuk menyajikan data dan dilanjutkan dengan statistik inferensial dengan menggunakan ANAVA dua jalur dengan taraf signifikan α = 0,05 yang dilanjutkan dengan uji Scheffe. Hasil penelitian menunjukkan: (1) hasil belajar ekonomi siswa yang diajarkan dengan strategi pembelajaran berbasis masalah lebih tinggi dari pada hasil belajar ekonomi siswa yang diajarkan dengan strategi pembelajaran ekspositori; (2) hasil belajar ekonomi siswa yang memiliki kepribadian ekstrovert lebih tinggi dari pada hasil belajar ekonomi siswa yang memiliki tipe kepribadian introvert; (3) terdapat interaksi antara strategi pembelajaran dengan tipe kepribadian  dalam mempengaruhi hasil belajar siswa. Hipotesis ini menunjukkan bahwa strategi pembelajaran berbasis masalah lebih tepat daripada model pembelajaran ekspositori dalam meningkatkan hasil belajar ekonomi siswa, dan siswa yang memiliki tipe kepribadian ekstrovert akan memperoleh hasil yang lebih baik dari pada siswa yang memiliki tipe kepribadian introvert. Kata Kunci: strategi pembelajaran, tipe kepribadian, hasil belajar ekonomi. Abstract: This study aims: (1) To find out the results of students' economic learning taught by problem-based learning strategy is higher than students who are taught by expository learning strategy. (2) To know the economic learning result of students who have extrovert personality type and students who have introverted personality. (3) To know the interaction between learning strategy with personality type to Economic learning result. The research method used is quasi experiment with 2 x 2 factorial design. Statistical test used is descriptive statistics to present the data and continued with inferential statistic by using two way ANOVA with significant level α = 0,05 followed by Scheffe test. The results showed: (1) the students 'economic learning outcomes taught with problem-based learning strategy is higher than the students' economic learning outcomes taught with expository learning strategies; (2) the students 'economic learning outcomes that have extroverted personality is higher than the students' economic learning outcomes that have introverted personality types; (3) there is interaction between learning strategy with personality type in influencing student learning outcomes. This hypothesis suggests that problem-based learning strategies are more appropriate than expository learning models in improving students' economic learning outcomes, and students with extroverted personality types will achieve better outcomes than students with introverted personality types. Keywords: learning strategy, personality type, economic learning result

MODIFIKASI MODEL PEMBELAJARAN QUANTUM LEARNING DENGAN STRATEGI PEMBELAJARAN TUGAS DAN PAKSA

2019 ◽  
Vol 2 ◽  
Author(s):  
Erna Pebriana ◽  
Bela Mustika Sari ◽  
Yasa Abdurrahman
Keyword(s):  
Student Learning ◽  
Learning Outcomes ◽  
Learning Strategies ◽  
Learning Process ◽  
Learning Strategy ◽  
Mathematics Learning ◽  
Learning Approaches ◽  
Quantum Learning ◽  
Task Strategies ◽  
Improve Student Learning

This writing aims to make students more active and disciplined in the learning process and can also increase creativity and learning outcomes. The low mathematics learning outcomes are not only due to difficult mathematics, but are caused by several factors which include students themselves, teachers, learning approaches, and learning environments that are interconnected with each other. To improve the ability and results of learning it is necessary to make modifications to the task learning strategy and force. Quantum learning is a tip, a guide, a strategy and an entire learning process that can sharpen understanding and memory, and make learning a pleasant and useful process. Task and Forced Learning Strategies are strategies that focus on giving assignments and a little coercion so that students complete their tasks on time so that the learning process can run effectively. Therefore, the writer modifies the model of quantum learning with task and forced learning strategies, the results of this modification show that learning with quantum learning models with forced and task strategies can improve the learning process so that students become more disciplined in doing tasks, can motivate student learning, and can improve student learning outcomes.

Microsurgical resection of foramen magnum meningioma through a transcondylar approach: three-dimensional operative video

2019 ◽  
Vol 1 (2) ◽  
pp. V3
Author(s):  
Guilherme H. W. Ceccato ◽  
Rodolfo F. M. da Rocha ◽  
Duarte N. C. Cândido ◽  
Wladimir O. Melo ◽  
Marcio S. Rassi ◽  
...  
Keyword(s):  
Nerve Palsy ◽  
Three Dimensional ◽  
Foramen Magnum ◽  
Complete Resection ◽  
Neurophysiological Monitoring ◽  
Cervical Instability ◽  
Transcondylar Approach ◽  
Postoperative Mri ◽  
Microsurgical Resection

Foramen magnum (FM) meningiomas are challenging lesions. We present the case of a 38-year-old female with neck pain, dysphonia, and slight twelfth nerve palsy. Imaging workup was highly suggestive of an FM meningioma, and microsurgical resection with the aid of intraoperative neurophysiological monitoring was indicated. A transcondylar approach was employed, the vertebral artery was mobilized, and the tumor was completely removed. Postoperative MRI demonstrated complete resection. There were no signs of cervical instability. The patient presented with improvement of her symptoms and no new neurological deficit on follow-up. FM meningiomas can be successfully resected using a transcondylar approach, since it increases the exposure of the ventral FM, allowing the surgeon to work parallel to the skull base and flush with the tumor’s attachment. Informed consent was obtained from the patient for publication of this operative video.The video can be found here: https://youtu.be/itfUOB-6zM0.

Sign in / Sign up

Export Citation Format

Share Document