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"Diab, Mohammed"
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PMK—A Knowledge Processing Framework for Autonomous Robotics Perception and Manipulation
by
Rosell, Jan
,
Ud Din, Muhayy
,
Akbari, Aliakbar
in
knowledge-based reasoning
,
perception knowledge
,
task-motion planning
2019
Autonomous indoor service robots are supposed to accomplish tasks, like serve a cup, which involve manipulation actions. Particularly, for complex manipulation tasks which are subject to geometric constraints, spatial information and a rich semantic knowledge about objects, types, and functionality are required, together with the way in which these objects can be manipulated. In this line, this paper presents an ontological-based reasoning framework called Perception and Manipulation Knowledge (PMK) that includes: (1) the modeling of the environment in a standardized way to provide common vocabularies for information exchange in human-robot or robot-robot collaboration, (2) a sensory module to perceive the objects in the environment and assert the ontological knowledge, (3) an evaluation-based analysis of the situation of the objects in the environment, in order to enhance the planning of manipulation tasks. The paper describes the concepts and the implementation of PMK, and presents an example demonstrating the range of information the framework can provide for autonomous robots.
Journal Article
Integrated geophysical healthy assessment for eco development and coastal sustainability in Ras Gamila, Egypt
by
Darwish, Zamzam M. A.
,
Basheer, Alhussein Adham
,
Mohamed, Abdelnasser
in
704/106
,
704/172
,
704/2151
2025
Arid coastal regions like Ras Gamila, Egypt, face pressing environmental challenges, including seawater intrusion, freshwater scarcity, and development pressures, which threaten their ecological and economic sustainability. This study bridges a critical research gap by developing an integrated framework that links subsurface geophysical stability with surface environmental conditions to guide eco-development. We employed a multi-method approach, combining vertical electrical sounding (VES), time-domain electromagnetic (TDEM) soundings, shallow seismic reflection, soil radon analysis, and spatial data from digital elevation models (DEMs), shoreline dynamics, and climatological factors. Our results delineate a critical freshwater-bearing Nubian sandstone aquifer (19–94 m thick, resistivity: 228–302.5 Ωm) and identify significant seawater intrusion (resistivity: 1.1–2.5 Ωm). A novel sustainability matrix, integrating these diverse datasets, classifies the region into three distinct zones: high-sustainability inland areas (35–45% of the region) suitable for immediate development, moderate-sustainability central zones (35–45%) requiring targeted improvements, and low-sustainability coastal areas (25–30%) necessitating restoration and protection. The findings provide a scalable, geophysically-informed model for sustainable planning in arid coasts, directly supporting United Nations Sustainable Development Goals (SDGs) 6 (Clean Water) and 13 (Climate Action) by offering a science-based strategy for balancing economic growth with environmental conservation.
Journal Article
RETRACTED: Zhou et al. HOXA11-AS1 Promotes PD-L1-Mediated Immune Escape and Metastasis of Hypopharyngeal Carcinoma by Facilitating PTBP1 and FOSL1 Association. Cancers 2022, 14, 3694
2025
The journal retracts the article \"HOXA11-AS1 promotes PD-L1-mediated immune escape and metastasis of hypopharyngeal carcinoma by facilitating PTBP1 and FOSL1 association\" [...].The journal retracts the article \"HOXA11-AS1 promotes PD-L1-mediated immune escape and metastasis of hypopharyngeal carcinoma by facilitating PTBP1 and FOSL1 association\" [...].
Journal Article
Contingent Task and Motion Planning under Uncertainty for Human–Robot Interactions
2020
Manipulation planning under incomplete information is a highly challenging task for mobile manipulators. Uncertainty can be resolved by robot perception modules or using human knowledge in the execution process. Human operators can also collaborate with robots for the execution of some difficult actions or as helpers in sharing the task knowledge. In this scope, a contingent-based task and motion planning is proposed taking into account robot uncertainty and human–robot interactions, resulting a tree-shaped set of geometrically feasible plans. Different sorts of geometric reasoning processes are embedded inside the planner to cope with task constraints like detecting occluding objects when a robot needs to grasp an object. The proposal has been evaluated with different challenging scenarios in simulation and a real environment.
Journal Article
RETRACTED: HOXA11-AS1 Promotes PD-L1-Mediated Immune Escape and Metastasis of Hypopharyngeal Carcinoma by Facilitating PTBP1 and FOSL1 Association
2022
Background: The metastatic characteristics of hypopharyngeal squamous cell carcinoma (HSCC) lead to many diagnostic and therapeutic challenges, while functional long non-coding RNAs (lncRNAs) can provide effective strategies for its diagnosis and treatment. Methods: RT-qPCR, Western blot, immunohistochemistry, and an immunofluorescence assay were used to detect the related gene expression. Flow cytometry was used to measure the percentage of CD8+ and CD4+ T cells. CCK-8 and transwell assays were performed to analyze the role of HOXA11-AS1. The targeted relationship of the FOSL1/PD-L1 promoter was measured by ChIP and dual-luciferase reporter assays. RNA pulldown and RIP assays were used to measure the interaction between HOXA11-AS1, FOSL1, and PTBP1. A tumor xenograft study was used to analyze HOXA11-AS1 function in vivo. Results: HOXA11-AS1, PD-L1, and FOSL1 were upregulated in HSCC, and HOXA11-AS1 positively correlated with PD-L1. HOXA11-AS1 knockdown upregulated CD8+ T cells through an increase in IFN-γ concentration while decreasing the proliferation, migration, and invasion of HSCC cells. FOSL1 bound the PD-L1 promoter, increasing gene expression. HOXA11-AS1 enhanced the stability of FOSL1 mRNA by binding to PTBP1. HOXA11-AS1 or PTBP1 overexpression increased FOSL1 and PD-L1 expression. PD-L1 knockdown arrested the inhibiting function of HOXA11-AS1 overexpression on CD8+ T cell content. HOXA11-AS1 knockdown inhibited immune escape and metastasis through PD-L1 regulation by downregulating FOSL1 in vivo. Conclusion: HOXA11-AS1 promoted PD-L1 expression by upregulating FOSL1 levels through PTBP1, thereby facilitating immune escape, proliferation, and metastasis of HSCC cells.
Journal Article
The relationship between celebrities’ credibility and advertising effectiveness
by
Hassan Fathelrahman Mansour, Ilham
,
Mohammed Elzubier Diab, Dalia
in
Attitudes
,
Celebrities
,
Effectiveness
2016
Purpose
The purpose of this study is twofold, first, the study aimed at investigating the impact of celebrities’ credibility on advertising effectiveness by examining the celebrity attributes that are likely to influence consumer attitude towards celebrity-endorsed TV advertising and their purchase behaviour. Second, the study seeks to identify the mediating role of religiosity on consumers’ attitudes towards celebrity-endorsed television advertising and buying behaviour.
Design/methodology/approach
The study is based on a survey questionnaire in a sample of 370 Sudanese customers on their attitude towards the celebrity endorsement of television advertising.
Findings
The study found that celebrities’ likeability and their attractiveness have the greatest impact on both consumers Attitude and their purchase behaviour. The study also confirms that religiosity partially mediate both the relationships between celebrities’ credibility and the attitude towards the advertisement and purchase behaviour and revealed that religiosity correlates negatively with celebrities’ credibility and attitude towards advertisement.
Research limitations/implications
However, the study has some limitations, as it investigates the effectiveness of celebrities’ endorsement in TV commercials only. Future research could be extended to investigate the effectiveness of using celebrities advertising on other different media such as radio, printed and outdoors media. Further, the study uses a scale based on the Islamic practice dimensions, and using a more comprehensive scale to measure religiosity based on both belief and practices may be a further extension.
Practical implications
These results have important implications for advertising practitioners and business enterprises in Sudan, and other similar communities. They provide guidance in the sense that religiosity should be weighed in and given high importance when using celebrities in advertising campaigns and that the advertisement contents should be compliant with the Islamic law (Shariah).
Social implications
Understanding how religious beliefs influence the attitude towards the advertising is of great importance to international advertisers to improve advertising effectiveness without offending their Muslim audience. The study enriches the literature on the religiosity and its influence on the consumer behaviour, particularly in the celebrity-endorsed advertisements.
Originality/value
To the best of the authors knowledge, this study is the first study of its kind in Sudan to explore the impact of celebrities’ endorsement on consumers attitude and buying behaviour and provide empirical evidence to verify the existence of a mediating role of religiosity on both the attitude and purchase behaviour in the Sudanese context. It provides an understanding of Sudanese attitudes and purchase decision, as Muslims, and thus provides practitioners with guidelines on how to design celebrity-endorsed TV advertisements to influence consumers’ attitude and buying behaviour.
Journal Article
Primary Dermis Fat Grafting for Socket Reconstruction: Retrospective Comparison of Electrocoagulation versus Scalpel Dissection for Epidermis Removal
by
Alahmadawy, Yomna Amr
,
Diab, Mostafa Mohammed
in
anophthalmia
,
Comparative analysis
,
Debridement
2020
To evaluate outcomes of the use of electrocoagulation for epidermis removal in dermis fat grafting (DFG) compared to the conventional scalpel dissection in patients who underwent primary anophthalmic socket reconstruction.
Retrospective, observational, and comparative study.
A retrospective review was performed on patients who underwent primary DFG for socket reconstruction between 2017 and 2019 at tertiary teaching hospitals. Patients with previous orbital surgery, previous radiotherapy to the periocular region, any medical condition that affects healing, cicatrizing ocular surface disease or heavy smokers were excluded. Patients with complete documentation of preoperative and postoperative data only were included. Patients were divided into two groups; group A: epidermis removal by the traditional scalpel dissection and group B: epidermis removal using low power setting electrocoagulation. The main outcome was the timing of complete epithelialization of the dermis layer. Other outcomes included implant motility, prosthesis fitting, patient's satisfaction, and any complications.
A total of 27 patients met the study criteria, and the mean follow-up period was 24.81 months. There were no differences between both groups regarding preoperative characteristics. The mean duration of complete epithelialization of the DFG implant was 9.15 ± 2.94 weeks in group A compared to 22.29 ± 4.43 weeks in group B (p value <0.001). Dermal ulceration was noticed in 9 patients (64.3%) in group B compared to none in group A (p value =0.001). Dermal ulceration was significantly associated with long conjunctival healing period (p value <0.001). Volume loss was more common in group B while graft hirsutism and granuloma were more evident in group A. Final prosthesis fitting was possible in all included patients.
Epidermis removal using the electrocoagulation is related to much more delayed epithelialization of the dermis with a higher rate of dermal ulceration compared to the scalpel dissection technique. However, there was no significant difference between both groups regarding the final prosthesis fitting or the overall patient satisfaction.
Journal Article
A framework for trust-related knowledge transfer in human–robot interaction
2024
Trustworthy human–robot interaction (HRI) during activities of daily living (ADL) presents an interesting and challenging domain for assistive robots, particularly since methods for estimating the trust level of a human participant towards the assistive robot are still in their infancy. Trust is a multifaced concept which is affected by the interactions between the robot and the human, and depends, among other factors, on the history of the robot’s functionality, the task and the environmental state. In this paper, we are concerned with the challenge of trust transfer, i.e. whether experiences from interactions on a previous collaborative task can be taken into consideration in the trust level inference for a new collaborative task. This has the potential of avoiding re-computing trust levels from scratch for every new situation. The key challenge here is to automatically evaluate the similarity between the original and the novel situation, then adapt the robot’s behaviour to the novel situation using previous experience with various objects and tasks. To achieve this, we measure the semantic similarity between concepts in knowledge graphs (KGs) and adapt the robot’s actions towards a specific user based on personalised interaction histories. These actions are grounded and then verified before execution using a geometric motion planner to generate feasible trajectories in novel situations. This framework has been experimentally tested in human–robot handover tasks in different kitchen scene contexts. We conclude that trust-related knowledge positively influences and improves collaboration in both performance and time aspects.
Journal Article
Collaborative care model for diabetes in primary care settings in Qatar: a qualitative exploration among healthcare professionals and patients who experienced the service
by
Diab, Mohammed Issam
,
Hussain, Mohamed Abdelazim Mohamed
,
Sankaralingam, Sowndramalingam
in
Blood pressure
,
Caregivers
,
Clinics
2021
Background
Diabetes mellitus is highly prevalent and associated with huge economic burden globally. The conventional care and management of diabetes mellitus is highly fragmented and complex, warranting the need for a comprehensive Collaborative Care Model (CCM). Little is known about the perception of patients with diabetes and their healthcare providers about CCM, its barriers and facilitators. This study aimed to explore the value of CCM in diabetes care at a primary healthcare (PHC) setting from the perspective of patients with diabetes and healthcare professionals (HCPs), in an effort to expand our current knowledge on collaborative care in diabetes at primary care level for the purpose of quality improvement and service expansion.
Methods
Using an exploratory case study approach, semi-structured interviews were conducted among patients and HCPs who encountered CCM in Qatar during 2019 and 2020. The semi-structured interviews were transcribed verbatim and the data were analysed and interpreted using a deductive-inductive thematic analysis approach.
Results
Twelve patients and 12 HCPs at a diabetes clinic participated in one-to-one interviews. The interviews resulted in five different themes: the process and components of collaborative care model (four subthemes), current organizational support and resources (three subthemes), impact of collaborative care model on diabetes outcomes (three subthemes), enablers of collaborative care model (three subthemes), and barriers to collaborative care model (three subthemes). The participants indicated easy access to and communication with competent and pleasant HCPs. The patients appreciated the extra time spent with HCPs, frequent follow-up visits, and health education, which empowered them to self-manage diabetes. HCPs believed that successful CCM provision relied on their interest and commitment to care for patients with diabetes. Generally, participants identified barriers and facilitators that are related to patients, HCPs, and healthcare system.
Conclusions
The providers and users of CCM had an overall positive perception and appreciation of this model in PHC settings. Barriers to CCM such as undesirable attributes of HCPs and patients, unsupportive hospital system, and high workload must be addressed before implementing the model in other PHC settings.
Journal Article
Combined levator and frontalis muscle advancement flaps for recurrent severe congenital ptosis
by
Diab, Mostafa Mohammed M.
,
Abd-Elaziz, Khaled
,
Allen, Richard C.
in
692/699/3161/3166
,
692/700/565/545
,
Blepharoplasty - methods
2023
Background
To evaluate the outcomes of combined levator resection and frontalis muscle advancement for surgical management of recurrent severe congenital ptosis.
Design
Retrospective, nonrandomized interventional case series.
Methods
A retrospective review was performed of patients who underwent combined levator resection and frontalis muscle advancement for recurrent congenital ptosis between 2017 and 2020. Inclusion criteria were levator function of 4 mm or less and margin reflex distance 1 (MRD1) of 0 mm or less. Main outcome measures were postoperative MRD 1, lagophthalmos, lash angle, and grades of eyelid contour and crease. The outcomes were assessed by reviewing medical charts and photographs.
Results
Thirty-one patients (35 eyelids) met the inclusion criteria. The mean preoperative MRD1 was −1.14 ± 1.56 mm, which improved to 3.93 ± 0.52 mm with an average lagophthalmos of 0.91 ± 0.74 mm at the last follow-up. A total of 91.4% of eyelids had excellent eyelid contour, crease, and eyelash angle at the final follow-up. One eyelid required revision surgery. There were no other significant complications.
Conclusions
For poor function recurrent congenital ptosis, combining levator resection and frontalis muscle advancement is an effective method that results in long-term correction with cosmetically pleasing outcomes and minimal complications.
Journal Article