LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 7 of total 7

Search options

  1. Book ; Online: Adversarial Learning Networks

    Ambastha, Abhinit Kumar / Yun, Leong Tze

    Source-free Unsupervised Domain Incremental Learning

    2023  

    Abstract: This work presents an approach for incrementally updating deep neural network (DNN) models in a non-stationary environment. DNN models are sensitive to changes in input data distribution, which limits their application to problem settings with stationary ...

    Abstract This work presents an approach for incrementally updating deep neural network (DNN) models in a non-stationary environment. DNN models are sensitive to changes in input data distribution, which limits their application to problem settings with stationary input datasets. In a non-stationary environment, updating a DNN model requires parameter re-training or model fine-tuning. We propose an unsupervised source-free method to update DNN classification models. The contributions of this work are two-fold. First, we use trainable Gaussian prototypes to generate representative samples for future iterations; second, using unsupervised domain adaptation, we incrementally adapt the existing model using unlabelled data. Unlike existing methods, our approach can update a DNN model incrementally for non-stationary source and target tasks without storing past training data. We evaluated our work on incremental sentiment prediction and incremental disease prediction applications and compared our approach to state-of-the-art continual learning, domain adaptation, and ensemble learning methods. Our results show that our approach achieved improved performance compared to existing incremental learning methods. We observe minimal forgetting of past knowledge over many iterations, which can help us develop unsupervised self-learning systems.
    Keywords Computer Science - Machine Learning
    Subject code 006 ; 004
    Publishing date 2023-01-27
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  2. Book ; Online: TIDo

    Ambastha, Abhinit Kumar / Yun, Leong Tze

    Source-free Task Incremental Learning in Non-stationary Environments

    2023  

    Abstract: This work presents an incremental learning approach for autonomous agents to learn new tasks in a non-stationary environment. Updating a DNN model-based agent to learn new target tasks requires us to store past training data and needs a large labeled ... ...

    Abstract This work presents an incremental learning approach for autonomous agents to learn new tasks in a non-stationary environment. Updating a DNN model-based agent to learn new target tasks requires us to store past training data and needs a large labeled target task dataset. Few-shot task incremental learning methods overcome the limitation of labeled target datasets by adapting trained models to learn private target classes using a few labeled representatives and a large unlabeled target dataset. However, the methods assume that the source and target tasks are stationary. We propose a one-shot task incremental learning approach that can adapt to non-stationary source and target tasks. Our approach minimizes adversarial discrepancy between the model's feature space and incoming incremental data to learn an updated hypothesis. We also use distillation loss to reduce catastrophic forgetting of previously learned tasks. Finally, we use Gaussian prototypes to generate exemplar instances eliminating the need to store past training data. Unlike current work in task incremental learning, our model can learn both source and target task updates incrementally. We evaluate our method on various problem settings for incremental object detection and disease prediction model update. We evaluate our approach by measuring the performance of shared class and target private class prediction. Our results show that our approach achieved improved performance compared to existing state-of-the-art task incremental learning methods.
    Keywords Computer Science - Machine Learning
    Subject code 006 ; 004
    Publishing date 2023-01-27
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  3. Article ; Online: A Cross-Sectional Study to Estimate the Severity of Anxiety in Professionals Remotely Working from Home during COVID-19 Pandemic

    Abhinit Kumar / Kunal Kumar / Nikhil Nayar / Shubhika Aggarwal / Shruti Sharma

    Journal of Research in Medical and Dental Science, Vol 10, Iss 1, Pp 445-

    2022  Volume 451

    Abstract: Background: The COVID-19 pandemic had a significant impact on public mental health besides playing havoc with one's physical health. The study aims to fill the existing gap in the research concerning the impact of COVID-19 on professionals working from ... ...

    Abstract Background: The COVID-19 pandemic had a significant impact on public mental health besides playing havoc with one's physical health. The study aims to fill the existing gap in the research concerning the impact of COVID-19 on professionals working from homes (WFH). Aims: To estimate the severity of anxiety in WFH Professionals during COVID-19 and to assess its impact on their financial, personal and professional lives. Material and Methods: It was an online questionnaire designed to profile remotely working professionals to assess the anxiety levels using Becks anxiety inventory (BAI) scale and the impact of Covid-19 on the personal, professional and financial status on 255 qualified respondents (123 women & 135 men). Statistical analysis: Chi-square test was done by using Statistical Package for the Social Sciences (SPSS) version 20 software. P-value P<0.05 was considered significant. Results: WFH during the COVID-19 restrictions increased moderate to severe anxiety levels (32.09%) with females (51.02%) suffering at higher rates than their male counterparts (15.09%). In these remotely working women, being married (64%) staying in a joint family (90.9%), having children (90.9%) heightened this anxiety. Results suggest that remotely working has adversely impacted their personal lives with females suffering at higher levels than men. It affected their financial lives adversely with females suffering at higher rates. Professional situation got severely impacted by this WFH however; women and men were similarly affected. Conclusion: Worsening anxiety levels and adverse impact on the personal, financial and professional lives in these remotely working Professionals especially women necessitates finding solutions by employers, psychologists and psychiatrists to alleviate this indirect impact of Covid 19.
    Keywords covid-19 ; coronavirus ; anxiety ; wfh ; remotely working women ; Dentistry ; RK1-715 ; Medicine (General) ; R5-920
    Subject code 360
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher Amber Publication
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  4. Article: A Deep Learning Approach to Neuroanatomical Characterisation of Alzheimer's Disease.

    Ambastha, Abhinit Kumar / Leong, Tze-Yun

    Studies in health technology and informatics

    2017  Volume 245, Page(s) 1249

    Abstract: Alzheimer's disease (AD) is a neurological degenerative disorder that leads to progressive mental deterioration. This work introduces a computational approach to improve our understanding of the progression of AD. We use ensemble learning methods and ... ...

    Abstract Alzheimer's disease (AD) is a neurological degenerative disorder that leads to progressive mental deterioration. This work introduces a computational approach to improve our understanding of the progression of AD. We use ensemble learning methods and deep neural networks to identify salient structural correlations among brain regions that degenerate together in AD; this provides an understanding of how AD progresses in the brain. The proposed technique has a classification accuracy of 81.79% for AD against healthy subjects using a single modality imaging dataset.
    MeSH term(s) Alzheimer Disease/complications ; Alzheimer Disease/pathology ; Brain/pathology ; Cognitive Dysfunction ; Humans ; Machine Learning ; Magnetic Resonance Imaging
    Language English
    Publishing date 2017
    Publishing country Netherlands
    Document type Journal Article
    ISSN 0926-9630
    ISSN 0926-9630
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Prevalence of depression and anxiety among children in rural and suburban areas of Eastern Uttar Pradesh

    Shailendra Kumar Mishra / Mona Srivastava / Narendra K Tiwary / Abhinit Kumar

    Journal of Family Medicine and Primary Care, Vol 7, Iss 1, Pp 21-

    A cross-sectional study

    2018  Volume 26

    Abstract: Background: Psychiatric morbidity in children and adolescents is a major concern as they become more complex and intense with children's transition into adolescence. Aim: The aim of this study is to assess and compare the prevalence of depression and ... ...

    Abstract Background: Psychiatric morbidity in children and adolescents is a major concern as they become more complex and intense with children's transition into adolescence. Aim: The aim of this study is to assess and compare the prevalence of depression and anxiety among children residing in rural and suburban area of eastern Uttar Pradesh and understand the burden of these problems in our society. Materials and Methods: Children, in the age group 11–18 years, were divided into 2 groups: Group I – 100 children from rural area Tikri; Group II – 100 children from suburban area Sunderpur. Their sociodemographic details were recorded. Children's Depression Inventory and Revised Children's Manifest Anxiety Scale were used to screen for depression and anxiety in children, respectively. The final diagnosis was done using present state examination in accordance with International Classification of Mental and Behavioral Disorders 10. Data were statistically analyzed using Chi-square test. Results: The prevalence of depression was found to be 14.5% while that of anxiety disorder was found to be 15%. There was no significant difference in the prevalence of depression or anxiety in rural and suburban areas (P > 0.05). Depression and anxiety were more prevalent in middle adolescence, in females, and in lower-middle socioeconomic group. Depression was more prevalent in the students of class 9th –12th, whereas anxiety was more in students of lower classes. Depression was more prevalent in joint families. These differences show some important trends regarding factors affecting these problems. Conclusion: This study yields useful information which could be of use in early management of psychiatric disorders present in the community and prevent their development into chronic disorders.
    Keywords Adolescence ; anxiety ; children ; depression ; prevalence ; Medicine ; R
    Subject code 360 ; 150
    Language English
    Publishing date 2018-01-01T00:00:00Z
    Publisher Wolters Kluwer Medknow Publications
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  6. Article ; Online: A study of prevalence of depression and anxiety in patients suffering from tuberculosis

    Kunal Kumar / Abhinit Kumar / Prakash Chandra / Hari Mohan Kansal

    Journal of Family Medicine and Primary Care, Vol 5, Iss 1, Pp 150-

    2016  Volume 153

    Abstract: Objective: The study was conducted to determine the point prevalence of depression and anxiety in patients suffering from tuberculosis. Material and Methods: Total of 100 consecutive cases were included who were already diagnosed with tuberculosis after ... ...

    Abstract Objective: The study was conducted to determine the point prevalence of depression and anxiety in patients suffering from tuberculosis. Material and Methods: Total of 100 consecutive cases were included who were already diagnosed with tuberculosis after applying inclusion and exclusion criteria. Tools used were General Health Questionnaire 12 (GHQ-12), Beck Depression Inventory (BDI-II) and Hamilton Anxiety Rating Scale (HARS). Result: Out of 100 cases, 74 cases found to be having psychiatric symptoms, in which 35 cases were suffering from depression and 39 were suffering from anxiety. Conclusion: Psychiatric morbidity was present in the diagnosed cases of tuberculosis. Proper psycho education, timely intervention in the form of proper diagnosis and specific treatment was required. It should also be evaluated further on a bigger target population.
    Keywords Depression ; generalized anxiety disorder ; tuberculosis ; Medicine ; R
    Language English
    Publishing date 2016-01-01T00:00:00Z
    Publisher Wolters Kluwer Medknow Publications
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  7. Article ; Online: A study to find depression in patients attending dermatological OPD in a teaching hospital

    Abhinit Kumar / Kunal Kumar / Praneta Swarup / Shitiz Goel / Abhay Singh Tomar

    Journal of Family Medicine and Primary Care, Vol 5, Iss 2, Pp 449-

    2016  Volume 452

    Abstract: Introduction: The relationship between skin and the brain exists because the brain, as the center of psychological functions, and the skin have the same ectodermal origin and are affected by the same hormones and neurotransmitters. Skin disorder can be a ...

    Abstract Introduction: The relationship between skin and the brain exists because the brain, as the center of psychological functions, and the skin have the same ectodermal origin and are affected by the same hormones and neurotransmitters. Skin disorder can be a potential source of emotional distress and psychiatric illness leading to impaired psychosocial adjustments. Aims and Objectives: The aim and objective of this study was to find psychiatric depression in patients attending dermatology outpatient department (OPD). Materials and Methods: The study was conducted in the department of psychiatry. A total of 200 patients of both gender were consecutively taken who referred to psychiatry OPD from skin OPD after meeting inclusion and exclusion criteria. Results: A total of 33.3% patients scored high on GHQ-12 Scale (General Health Questionnaire-12) and also clinically found that they were suffering from depression. Conclusion: Co-morbid Depression found in patients suffering from skin disorders. Proper screening and appropriate referral required for better prognosis.
    Keywords Depression ; hormones ; neurotransmitters ; skin disorders ; Medicine ; R
    Subject code 616
    Language English
    Publishing date 2016-01-01T00:00:00Z
    Publisher Wolters Kluwer Medknow Publications
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

To top