Majed Hameed - Academia.edu (original) (raw)

Papers by Majed Hameed

ArXiv, 2019

Acknowledgment: Research reported in this publication was supported by King Abdullah University o... more Acknowledgment: Research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST) in collaboration with King Abdulaziz City for Science and Technology (KACST) and King Saud University (KSU). Funding: This research project has been funded by King Abdullah University of Science and Technology (KAUST) Base Research Fund (BAS/1/1627-01-01), in collaboration with King Abdulaziz City for Science and Technology (KACST) and King Saud University (KSU).

BMJ Case Reports, 2021

Frequently the cause of raised intracranial pressure remains unresolved and rarely is related to ... more Frequently the cause of raised intracranial pressure remains unresolved and rarely is related to spinal tumours, moreover less to spinal medulloblastoma without primary brain focus. An 18-year-old woman had a 3-month history of headache and impaired vision. Neurological examination revealed bilateral sixth cranial nerve palsies with bilateral papilloedema of grade III. No focal brain or spine lesion was found on imaging. Consecutive lumbar punctures showed high opening pressure and subsequent increasing protein level. Meningeal biopsy was negative. At one point, she developed an increasing headache, vomiting and back pain. Spine MRI showed diffuse nodular leptomeningeal enhancement with the largest nodule at T6–T7. Malignant cells were detected in cerebrospinal fluid. She underwent laminectomy with excisional biopsy, and pathology showed medulloblastoma WHO grade IV. She was treated with chemotherapy and craniospinal irradiation and made a good recovery.

IEEE Journal of Biomedical and Health Informatics, 2020

Epilepsy is a neurological disorder ranked as the second most serious neurological disease known ... more Epilepsy is a neurological disorder ranked as the second most serious neurological disease known to humanity, after stroke. Inter-ictal spiking is an abnormal neuronal discharge after an epileptic seizure. This abnormal activity can originate from one or more cranial lobes, often travels from one lobe to another, and interferes with normal activity from the affected lobe. The common practice for Inter-ictal spike detection of brain signals is via visual scanning of the recordings, which is a subjective and a very time-consuming task. Motivated by that, this paper focuses on using machine learning for epileptic spikes classification in magnetoencephalography (MEG) signals. First, we used the Position Weight Matrix (PWM) method combined with a uniform quantizer to generate useful features from time domain and frequency domain through a Fast Fourier Transform (FFT) of the framed raw MEG signals. Second, the extracted features are fed to standard classifiers for inter-ictel spikes classification. The proposed technique shows great potential in spike classification and reducing the feature vector size. Specifically, the proposed technique achieved average sensitivity up to 87% and specificity up to 97% using 5-folds cross-validation applied to a balanced dataset. These samples are extracted from nine epileptic subjects using a sliding frame of size 95 samplespoints with a step-size of 8 sample-points.

Clinical Pathology

Extranodal NK/T-cell lymphoma (ENKTL) is a well-defined cytotoxic lymphoma strongly associated wi... more Extranodal NK/T-cell lymphoma (ENKTL) is a well-defined cytotoxic lymphoma strongly associated with Epstein–Barr virus (EBV) infection, commonly affecting the nasopharynx and upper aerodigestive tract. Primary central nervous system (CNS) involvement is rare, and only 17 cases were previously reported in the literature. Here, we report the case of a 44-year-old male admitted with a 3-month history of personality changes and progressive right leg weakness. Brain magnetic resonance imaging studies (MRIs) revealed multiple rim-enhancing brain lesions bilaterally. An extensive clinical and laboratory workup was unrevealing, and 2 brain biopsies were initially considered inconclusive. Pertinently, no systemic lymphoproliferative disorder was identified. The patient initially experienced remarkable clinical improvement with dexamethasone, pulse methylprednisolone, and rituximab therapy. However, he eventually had rapid clinical deterioration, was found to have increased brain lesions, and...

The impact of the capital structure on Iraqi banks’ performance, 2020

The current paper aims to investigate the effect of the capital structure on the profitability of... more The current paper aims to investigate the effect of the capital structure on the profitability of a panel of eighteen Iraqi listed banks from 2009 to 2018. Furthermore, the unbalanced panel data approach (fixed effect and random effect) is utilized to explore the influence of capital structure on banks’ profitability. This study’s findings point out that the banks’ performance in terms of return on assets has a significant positive association with equity to assets ratio, liabilities to assets ratio, and bank size. On the other hand, long-term debt to assets ratio, short-term debt to assets ratio, and total debt to assets ratio showed a significant negative effect on banks’ performance. This study highlights new facts for an enhanced understanding of the capital structure and its association with banks’ performance in developing economies like Iraq. This study is considered one of the earliest studies of its types by determining the Iraqi banks’ optimal structure and examining capit...

ArXiv, 2019

Acknowledgment: Research reported in this publication was supported by King Abdullah University o... more Acknowledgment: Research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST) in collaboration with King Abdulaziz City for Science and Technology (KACST) and King Saud University (KSU). Funding: This research project has been funded by King Abdullah University of Science and Technology (KAUST) Base Research Fund (BAS/1/1627-01-01), in collaboration with King Abdulaziz City for Science and Technology (KACST) and King Saud University (KSU).

BMJ Case Reports, 2021

Frequently the cause of raised intracranial pressure remains unresolved and rarely is related to ... more Frequently the cause of raised intracranial pressure remains unresolved and rarely is related to spinal tumours, moreover less to spinal medulloblastoma without primary brain focus. An 18-year-old woman had a 3-month history of headache and impaired vision. Neurological examination revealed bilateral sixth cranial nerve palsies with bilateral papilloedema of grade III. No focal brain or spine lesion was found on imaging. Consecutive lumbar punctures showed high opening pressure and subsequent increasing protein level. Meningeal biopsy was negative. At one point, she developed an increasing headache, vomiting and back pain. Spine MRI showed diffuse nodular leptomeningeal enhancement with the largest nodule at T6–T7. Malignant cells were detected in cerebrospinal fluid. She underwent laminectomy with excisional biopsy, and pathology showed medulloblastoma WHO grade IV. She was treated with chemotherapy and craniospinal irradiation and made a good recovery.

IEEE Journal of Biomedical and Health Informatics, 2020

Epilepsy is a neurological disorder ranked as the second most serious neurological disease known ... more Epilepsy is a neurological disorder ranked as the second most serious neurological disease known to humanity, after stroke. Inter-ictal spiking is an abnormal neuronal discharge after an epileptic seizure. This abnormal activity can originate from one or more cranial lobes, often travels from one lobe to another, and interferes with normal activity from the affected lobe. The common practice for Inter-ictal spike detection of brain signals is via visual scanning of the recordings, which is a subjective and a very time-consuming task. Motivated by that, this paper focuses on using machine learning for epileptic spikes classification in magnetoencephalography (MEG) signals. First, we used the Position Weight Matrix (PWM) method combined with a uniform quantizer to generate useful features from time domain and frequency domain through a Fast Fourier Transform (FFT) of the framed raw MEG signals. Second, the extracted features are fed to standard classifiers for inter-ictel spikes classification. The proposed technique shows great potential in spike classification and reducing the feature vector size. Specifically, the proposed technique achieved average sensitivity up to 87% and specificity up to 97% using 5-folds cross-validation applied to a balanced dataset. These samples are extracted from nine epileptic subjects using a sliding frame of size 95 samplespoints with a step-size of 8 sample-points.

Clinical Pathology

Extranodal NK/T-cell lymphoma (ENKTL) is a well-defined cytotoxic lymphoma strongly associated wi... more Extranodal NK/T-cell lymphoma (ENKTL) is a well-defined cytotoxic lymphoma strongly associated with Epstein–Barr virus (EBV) infection, commonly affecting the nasopharynx and upper aerodigestive tract. Primary central nervous system (CNS) involvement is rare, and only 17 cases were previously reported in the literature. Here, we report the case of a 44-year-old male admitted with a 3-month history of personality changes and progressive right leg weakness. Brain magnetic resonance imaging studies (MRIs) revealed multiple rim-enhancing brain lesions bilaterally. An extensive clinical and laboratory workup was unrevealing, and 2 brain biopsies were initially considered inconclusive. Pertinently, no systemic lymphoproliferative disorder was identified. The patient initially experienced remarkable clinical improvement with dexamethasone, pulse methylprednisolone, and rituximab therapy. However, he eventually had rapid clinical deterioration, was found to have increased brain lesions, and...

The impact of the capital structure on Iraqi banks’ performance, 2020

The current paper aims to investigate the effect of the capital structure on the profitability of... more The current paper aims to investigate the effect of the capital structure on the profitability of a panel of eighteen Iraqi listed banks from 2009 to 2018. Furthermore, the unbalanced panel data approach (fixed effect and random effect) is utilized to explore the influence of capital structure on banks’ profitability. This study’s findings point out that the banks’ performance in terms of return on assets has a significant positive association with equity to assets ratio, liabilities to assets ratio, and bank size. On the other hand, long-term debt to assets ratio, short-term debt to assets ratio, and total debt to assets ratio showed a significant negative effect on banks’ performance. This study highlights new facts for an enhanced understanding of the capital structure and its association with banks’ performance in developing economies like Iraq. This study is considered one of the earliest studies of its types by determining the Iraqi banks’ optimal structure and examining capit...