Displaying publications 121 - 140 of 232 in total

Abstract:
Sort:
  1. Priyank H, Verma A, Zama Khan DU, Prakash Rai N, Kalburgi V, Singh S
    Cureus, 2023 Jul;15(7):e42414.
    PMID: 37637546 DOI: 10.7759/cureus.42414
    Dental caries is a common dental health problem affecting all age groups across the globe. Accurate detection and assessment of dental caries are crucial for effective treatment and preventive measures. Teledentistry, which involves remote dental assessment using digital technologies, has shown promise as a potential tool for caries screening. This systematic review and meta-analysis aims to compare the dental caries scores obtained from clinical examinations and teledentistry assessments. Literature searches were conducted across databases such as PubMed, Embase, the Cochrane Library, Scopus, the Web of Science, the Cumulative Index to Nursing and Allied Health Literature (CINAHL), and PsycINFO by using predefined search terms and inclusion criteria. Two reviewers separately extracted the data. The study designs, evaluation techniques, dentition types, mean scores, and follow-up times of the included studies were examined. The New Castle-Ottawa Scale was used to assess the risk of bias. Review Manager (RevMan) (computer program) Version 5.4, The Cochrane Collaboration 2020, was used for the quantitative assessment of the data. Eight studies met the inclusion criteria and were included in the review. The findings revealed that teledentistry assessments (based on intraoral photographs captured using smartphones or intraoral cameras) demonstrated comparable accuracy to traditional clinical examinations in detecting and assessing dental caries. Among the four studies that were quantitatively analysed, no significant difference was noted at p = 0.09. A mean difference of 0.64 (95% confidence interval (CI): -0.10; 1.38) suggested that clinical examination and teledentistry-based checkup were on par with each other for the detection of dental caries. The New Castle-Ottawa scale (NOS) grading indicated that the studies were of good quality. Teledentistry may be an effective approach for identifying and evaluating dental caries. However, further research is required to substantiate the findings observed in the present review.
  2. Ng PY, Ahmad MJ, Ismail F, Lott PW, Singh S
    Eur J Ophthalmol, 2023 Sep;33(5):NP83-NP86.
    PMID: 36325679 DOI: 10.1177/11206721221136329
    INTRODUCTION: Infectious crystalline keratopathy (ICK) is a rare corneal disease. ICK has been recognised in patients with immunocompromised cornea or post penetrating keratoplasty. Here we report a case of ICK in an apparently healthy cornea.

    CASE DESCRIPTION: A 25-years old Chinese female, with no history of systemic or ocular disease, presented to the eye clinic with one-month history of right eye (RE) blurring of vision with foreign body sensation. On examination, there were dense white crystalline needle-like projections over inferior paracentral corneal stroma with intact epithelium. There was also presence of lower eyelid epiblepharon with lashes rubbing against the diseased area. Corneal scraping cultures were suggestive of bacterial infection. Patient responded well with corneal epithelium debridement, intensive topical antibiotics and epiblepharon correction to prevent further microtrauma.

    CONCLUSIONS: The only contributing factor for ICK in our patient was trichiasis from epiblepharon. Repetitive microtrauma caused by the eyelashes lead to direct penetration and inoculation of normal ocular flora into the corneal stroma. Clinicians need to be vigilant in ruling out other possible causes such as lid abnormalities when managing an ICK patient without apparent risk factors.

  3. Khor HD, Lott PW, Daman Huri SNR, Singh S, Iqbal T
    Cureus, 2023 Jul;15(7):e42722.
    PMID: 37654949 DOI: 10.7759/cureus.42722
    This study aims to report a case of neuro-ophthalmic manifestation in a coronavirus disease 2019 (COVID-19) patient and a literature review of neuro-ophthalmological manifestation in COVID-19 patients. A 57-year-old male presented with headache, giddiness, and sudden onset of diplopia over two days after having a flu-like illness. Clinical examination revealed bilateral bizarre extraocular movement with right lower motor neuron facial nerve palsy. A polymerase chain reaction test for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was positive. Computed tomography (CT) and contrast-enhanced CT of the brain and CT venography were unremarkable. Magnetic resonance imaging (MRI) of the brain, magnetic resonance angiography of the circle of Willis, and MRI of the internal auditory meatus revealed a subacute pontine infarction with no leptomeningeal or cranial nerve enhancement and a normal circle of Willis. The patient received a course of oral prednisolone and clinical symptoms improved gradually. Articles published between December 2019 and June 2022 were included. A total of 23 cases, with 14 male and nine female patients, were summarized. The mean age at presentation was 46.95 years (range = 9-71 years), with the most affected age group ranging from 31 to 70 years (17 of 23 cases, 73.91%). Neuro-ophthalmological symptoms and signs can be isolated or associated with neurological syndromes. The manifestations include optic neuritis, isolated or multiple cranial nerve palsies, acute vision loss, Miller Fisher syndrome, myasthenia gravis, acute disseminated encephalomyelitis, Guillain-Barré syndrome, internuclear ophthalmoplegia, and cerebrovascular events. Diagnosing neuro-ophthalmic complications secondary to SARS-CoV-2 infection is challenging, as there are no pathognomonic symptoms to detect the disease. High clinical suspicion aids in early diagnosis and initiation of treatment may help in relieving the symptoms.
  4. Hussain S, Ghopa WAW, Singh SSK, Azman AH, Abdullah S, Harun Z, et al.
    Materials (Basel), 2022 Jul 14;15(14).
    PMID: 35888355 DOI: 10.3390/ma15144888
    Vibration fatigue characteristics are critical for rotating machinery components such as turbine rotor blades. Lattice structures are gaining popularity in engineering applications due to their unique ability to reduce weight and improve the mechanical properties. This study is an experimental investigation of octet-truss lattice structure utilization in turbine rotor blades for weight reduction and to improve vibration fatigue characteristics. One completely solid and three lattice infilled blades with variable strut thickness were manufactured via additive manufacturing. Both free and forced experimental vibration analyses were performed on the blades to investigate their modal and vibration fatigue characteristics. The blades were subjected to random vibration using a vibration shaker. The response was measured using a triaxial accelerometer in terms of vibration acceleration time histories in the X, Y, and Z directions. Results indicate a weight reduction of up to 24.91% and enhancement in the first natural frequency of up to 5.29% were achieved using lattice infilled blades. The fatigue life of the blades was investigated using three frequency domain approaches, namely, Lalanne, Dirlik and narrow band. The fatigue life results indicate that the 0.25 mm lattice blade exhibits the highest fatigue life, while the solid blade exhibits the lowest fatigue life of all four blades. The fatigue life of the 0.25 mm lattice blade was 1822-, 1802-, and 1819- fold higher compared to that of the solid blade, using the Lalanne, Dirlik, and narrow-band approaches, respectively. These results can serve as the first step towards the utilization of lattice structures in turbine blades, with thermal analysis as the next step. Therefore, apart from being light weight, the octet-truss lattice infilled blades exhibited superior vibration fatigue characteristics to vibration loads, thereby making them a potential replacement for solid blades in turbine rotors.
  5. Singh S, Numan A, Khalid M, Bello I, Panza E, Cinti S
    Small, 2023 Dec;19(51):e2208209.
    PMID: 37096900 DOI: 10.1002/smll.202208209
    Hydrogen peroxide (H2 O2 ) is a primary reactive oxygen species (ROS) that can act as a chemical signal in developing and progressing serious and life-threatening diseases like cancer. Due to the stressful nature of H2 O2 , there is an urgent need to develop sensitive analytical approaches to be applied to various biological matrices. Herein, a portable point-of-care electrochemical system based on MXene-Co3 O4 nanocomposites to detect H2 O2 in different cancer cell-lines is presented. The developed sensor is affordable, disposable, and highly selective for H2 O2 detection. This approach achieves a dynamic linear range of 75 µm with a LOD of 0.5 µm and a LOQ of 1.6 µm. To improve the practical application, the level of ROS is evaluated both in cancer cell lines MDA-MB-231 and DU145, respectively, to breast and prostate cancers, and in healthy HaCat cells. Moreover, the same cancer cells are treated with transforming growth factor-β1, and MXene-Co3 O4 modified strip is capable to monitorROS variation. The results are satisfactory compared with the cellular ROS fluorescent assay based on DCFH/DCFH-DA. These results open new perspectives for real-time monitoring of cancer progression and the efficacy of the therapy.
  6. Singh S, Singh S, Nachimuthu M, Kassim AF, Bhullar AK, Veerakumaran R, et al.
    Oman Med J, 2023 Sep;38(5):e550.
    PMID: 38225997 DOI: 10.5001/omj.2023.103
    OBJECTIVES: There is limited data on the relative effectiveness of different techniques used for administering genicular nerve block (GNB) for pain management of chronic knee osteoarthritis (OA) in the Malaysian population. This study aims to determine and compare the effectiveness of GNB administered using two pain management techniques?"anatomical landmark-guided (ALG) and ultrasound-guided (USG)?"for chronic knee OA in this population.

    METHODS: This retrospective cohort study included 40 patients with chronic knee OA who received GNB, 20 of whom underwent treatment with the USG technique and the other 20 with the ALG technique. Pain, stiffness, and functional limitation scores were assessed using the Western Ontario and McMaster Universities Osteoarthritis Index Questionnaire (WOMAC) and Numeric Rating Scale (NRS-11) at baseline and post-treatment day one, three weeks, and six weeks.

    RESULTS: Both groups reported a significant reduction in WOMAC and NRS-11 scores as per their feedback on day one, three weeks, and six weeks post-treatment. Greater reductions in WOMAC and NRS-11 scores were reported by patients who received GNB via USG than by ALG technique, the difference achieving statistical significance at six weeks after treatment (p =0.026).

    CONCLUSIONS: GNB administration using USG and ALG techniques are both effective in significantly reducing pain, stiffness, and functional limitation in patients suffering from chronic knee OA. Among the two techniques, USG appears to be more effective. Nevertheless, GNB guided by ALG continues to be a viable treatment modality, especially in healthcare settings with limited to no USG facilities.

  7. Thota RS, Ramkiran S, Singh S, Damani A, Wajekar AS, Koyyalagunta L
    Indian J Anaesth, 2023 Dec;67(12):1051-1060.
    PMID: 38343679 DOI: 10.4103/ija.ija_325_23
    BACKGROUND AND AIMS: Cancer pain guidelines remain confined due to implementation barriers, preventing them from attaining a global perspective. The guidelines must be robust in development and inculcate high-quality content to achieve practical utility. Quality indicators related to safe opioid practice empower effective guideline implementation.

    METHODS: The protocol was registered prospectively in PROSPERO (CRD42021244823). Guidelines published over the last decade providing insights into cancer pain management and incorporating safe opioid practice were evaluated. The review's primary outcome was to evaluate the quality of cancer pain guidelines. Appraisal of guidelines for research and evaluation II (AGREE II) instrument was used to assess a guideline's quality. The ADAPTE collaboration-guideline adaptation resource tool kit (ADAPTE) provided insights into its adaptation based on specific questions within the guideline.

    RESULTS: Fourteen cancer pain guidelines met the eligibility criteria and were included for quality evaluation. Eight guidelines were evaluated with combined AGREE II and ADAPTE process, attaining >66.7% in the rigour of development domain score, summated scaled domain score, and specific ADAPTE tools to evaluate the quality of each guideline. The intra-class correlation coefficient was utilised for resolving inter-rater agreement. 'Safe opioid practice' within a guideline was assessed for quality content implementation.

    CONCLUSION: Combined AGREE II and ADAPTE identified four cancer pain guidelines, namely Ministry of Health Malaysia, National Comprehensive Cancer Network, NCEC-National Clinical Guideline, and World Health Organization, which were of the highest quality and incorporated safe opioid practice effectively.

  8. Shiromwar SS, Chidrawar VR, Singh S, Chitme HR, Maheshwari R, Sultana S
    J Mol Neurosci, 2024 Jan 19;74(1):13.
    PMID: 38240858 DOI: 10.1007/s12031-023-02178-z
    Hypothalamus is central to food intake and satiety. Recent data unveiled the expression of N-methyl-D-aspartate receptors (NMDAR) on hypothalamic neurons and their interaction with GABAA and serotoninergic neuronal circuits. However, the precise mechanisms governing energy homeostasis remain elusive. Notably, in females, the consumption of progesterone-containing preparations, such as hormonal replacement therapy and birth control pills, has been associated with hyperphagia and obesity-effects mediated through the hypothalamus. To elucidate this phenomenon, we employed the progesterone-induced obesity model in female Swiss albino mice. Four NMDAR modulators were selected viz. dextromethorphan (Dxt), minocycline, d-aspartate, and cycloserine. Obesity was induced in female mice by progesterone administration for 4 weeks. Mice were allocated into 7 groups, group-1 as vehicle control (arachis oil), group-2 (progesterone + arachis oil), and group-3 as positive-control (progesterone + sibutramine); other groups were treated with test drugs + progesterone. Various parameters were recorded like food intake, thermogenesis, serum lipids, insulin, AST and ALT levels, organ-to-body weight ratio, total body fat, adiposity index, brain serotonin levels, histology of liver, kidney, and sizing of fat cells. Dxt-treated group has shown a significant downturn in body weight (p 
  9. Ong T, Khor HM, Kumar CS, Singh S, Chong E, Ganthel K, et al.
    Malays Orthop J, 2020 Nov;14(3):16-21.
    PMID: 33403058 DOI: 10.5704/MOJ.2011.004
    By 2050, it is predicted that six million hip fractures will occur each year of which the majority will happen in Asia. Malaysia is not spared from this predicted rise and its rate of increase will be one of the highest in this region. Much of this is driven by our unprecedented growth in the number of older people. Characteristics of individuals with hip fractures in Malaysia mirror what has been reported in other countries. They will be older multimorbid people who were already at risk of falls and fractures. Outcomes were poor with at least a quarter do not survive beyond 12 months and in those that do survive have limitation in their mobility and activities of daily living. Reviewing how these fractures are managed and incorporating new models of care, such as orthogeriatric care, could address these poor outcomes. Experts have warned of the devastating impact of hip fracture in Malaysia and that prompt action is urgently required. Despite that, there remains no national agenda to highlight the need to improve musculoskeletal health in the country.
  10. Chan Y, Ng SW, Mehta M, Anand K, Kumar Singh S, Gupta G, et al.
    Med Hypotheses, 2020 Nov;144:110298.
    PMID: 33254489 DOI: 10.1016/j.mehy.2020.110298
    Outbreaks of influenza infections in the past have severely impacted global health and socioeconomic growth. Antivirals and vaccines are remarkable medical innovations that have been successful in reducing the rates of morbidity and mortality from this disease. However, the relentless emergence of drug resistance has led to a worrisome increase in the trend of influenza outbreaks, characterized by worsened clinical outcomes as well as increased economic burden. This has prompted the need for breakthrough innovations that can effectively manage influenza outbreaks. This article provides an insight into a novel hypothesis that describes how the integration of nanomedicine, with the development of drugs and vaccines can potentially enhance body immune response and the efficacies of anti-viral therapeutics to combat influenza infections.
  11. Rai V, Shariffuddin II, Chan YK, Muniandy RK, Wong KK, Singh S
    BMC Anesthesiol, 2014;14:49.
    PMID: 25002831 DOI: 10.1186/1471-2253-14-49
    BACKGROUND: Complete heart block in pregnancy has serious implications particularly during the period of delivery. This is more so if the delivery is an operative one as the presence of heart block may produce haemodynamic instability in the intra operative period. We report a unique case of a pregnant mother with complete heart block undergoing hysterostomy, complicated by placenta accreta and intrauterine death.

    CASE PRESENTATION: A 37 year old Malaysian Chinese parturient was admitted at 25 weeks gestation following a scan which suggested intrauterine death and placenta accreta. She was diagnosed to have congenital complete heart block after her first delivery eight years previously but a pacemaker was never inserted. These medical conditions make her extremely likely to experience massive bleeding and haemodynamic instability. Among the measures taken to optimise her pre-operatively were the insertion of a temporary intravenous pacemaker and embolization of the uterine arteries to minimize peri-operative blood loss. She successfully underwent surgery under general anesthesia, which was relatively uneventful and was discharged well on the fourth post-operative day.

    CONCLUSION: Congenital heart block in pregnancies in the presence of potential massive bleeding is best managed by a team, with meticulous pre-operative optimization. Suggested strategies would include insertion of a temporary pacemaker and embolization of the uterine arteries to reduce the risk of the patient getting into life threatening situations.

  12. Sukari AAA, Singh S, Bohari MH, Idris Z, Ghani ARI, Abdullah JM
    Malays J Med Sci, 2021 Apr;28(2):100-105.
    PMID: 33958964 DOI: 10.21315/mjms2021.28.2.9
    Background: This paper outlines a summary of examination technique to identify the range of movement of the cervical spine. Due to common difficulties in obtaining tools for cervical examination within the district, a standardised compilation of easy-to-replicate examination techniques are provided using different tools.

    Methods: Bedside instruments that can be used includes a measuring tape, compass, goniometer, inclinometer and cervical range of motion (CROM) instrument.

    Discussion: Cervical flexion-extension, lateral flexion and rotation will be assessed with bedside instruments. This would aid in increasing accuracy and precision of objective measurement while conducting clinical examination to determine the cervical range of motion.

  13. Low A, Kadir AJ, Chow ZY, Khang TF, Singh S
    Indian J Ophthalmol, 2024 Aug 01;72(8):1118-1123.
    PMID: 39078954 DOI: 10.4103/IJO.IJO_2662_23
    PURPOSE: To evaluate the variation and stability of the posterior cornea surface parameters (posterior cornea curvature [PCC], posterior cornea astigmatism [PCA], and posterior cornea elevation [PCE]) after femtosecond laser-assisted in situ keratomileusis (LASIK) in patients with myopia and myopic astigmatism over a period of 6 months or longer.

    METHODS: This retrospective study comprised 284 right eyes. Patients aged 18 years or older with myopia up to -12.00 D and/or astigmatism up to -6.00 DC and who underwent femtosecond LASIK were recruited. Patients were divided into three subgroups: low myopia (-0.50 to -3.00 D), moderate myopia (>-3.00 to ≤-6.00 D), and high myopia (>-6.00 D), according to their pre-LASIK spherical equivalent (SE). The variables included for analysis were PCC (central 0-3.0 mm, pericentral 3.0-6.0 mm, and peripheral region 6.0-9.0 mm), PCE, PCA, internal anterior chamber depth, intraocular pressure, and central cornea thickness at the pre- and post-LASIK stages.

    RESULTS: The central PCC remained unchanged across all three myopia subgroups at 1 month when compared to the pre-LASIK stage and remained stable at 6 months. The pericentral regions became flatter across all myopia subgroups at 1 month postsurgery (P < 0.001) and remained unchanged at 6 months. This trend was not seen in the peripheral cornea regions, which remained unchanged at 1 and 6 months post-LASIK when compared to pre-LASIK mean readings. There were minimal changes in post-LASIK posterior cornea astigmatism throughout follow-up. There was no incidence of post-LASIK surgery ectasia in this study population.

    CONCLUSION: Post-LASIK, the different cornea subregions behaved differently. Overall, the posterior cornea surface remained stable post-LASIK across all myopia subgroups throughout follow-up.

  14. Rathod L, Mishra S, Samuel S, Yadav K, Sharma G, Singh S, et al.
    Trop Biomed, 2024 Jun 01;41(2):209-213.
    PMID: 39154275 DOI: 10.47665/tb.41.2.012
    Monitoring mosquito host choice to identify high-risk groups for different vector-borne diseases is important to devise vector control strategies and disease management. The present study was conducted to develop and validate a PCR-based method to identify human sex in blood-fed Aedes aegypti mosquitoes. Several human genes present in both the X and Y chromosomes were screened and diagnostic PCR primers were successfully designed and amplified for the human STS gene. The limit of detection of this PCR assay was carried out on Ae. aegypti fed with human blood up to 5 days (120 hours) post blood-meal under laboratory condition. The efficiency of this PCR assay was evaluated in field-collected Ae. aegypti mosquitoes and compared with other existing methods. The developed PCR primers can successfully amplify and distinguish human sex in mosquitoes up to 72 hours after a blood meal, with an amplified product of 627bp and 298bp for male (XY) and 627bp for female (XX) blood-fed mosquitoes. Further, validation of this assay in field-collected Ae. aegypti mosquitoes revealed that this assay could detect human sex in mosquito blood meal substantially more efficiently (c2 = 4.5, p = 0.034) than other PCR based assay. The newly developed PCR assay highly specific to human DNA and can distinguish male and female DNA for up to 72 hours. This assay can be is used for identifying highrisk groups and extended to other medically important hematophagous insects to assess their role in disease transmission and epidemic preparedness.
  15. Khor HG, Lott PW, Wan Ab Kadir AJ, Singh S, Iqbal T
    J Ocul Pharmacol Ther, 2024;40(6):342-360.
    PMID: 37676992 DOI: 10.1089/jop.2023.0012
    Purpose: Ozurdex had shown promising anatomical and functional outcomes in managing refractory Irvine-Gass syndrome over the years. Burgeoning usage of Ozurdex has prompted the study of its related complications, particularly the anterior chamber migration of the implant. Methods: Literature reviews on the anterior chamber migration of the Ozurdex via PubMed, EBSCO, and TRIP databases were searched from 2012 to 2020. The predisposing factors, outcomes, and management of such cases were evaluated. Results: A total of 54 articles consisting of 105 cases of anterior migration of Ozurdex were included in this analysis. The vitrectomized eye and compromised posterior capsule were highly associated with this complication. About 81.9% of the cases had cornea edema upon presentation, with 31.4% of them ending up with cornea decompensation despite intervention. Although there was high intraocular pressure reported initially in 22 cases, only 2 cases required glaucoma filtration surgeries in which they had preexisting glaucoma. Numerous techniques of repositioning or surgical removal of the implant were described but they were challenging and the outcomes varied. Conclusions: A noninvasive method of manipulating the Ozurdex into the vitreous cavity via the "Trendelenburg position, external pressure with head positioning" maneuvers is safe yet achieves a favorable outcome. Precaution must be taken whenever offering Ozurdex to the high-risk eyes. Prompt repositioning or removal of the implant is crucial to deter cornea decompensation. Clinical Trial Registration number: NMRR-22-02092-S9X (from the Medical Research and Ethics Committee (MREC), Ministry of Health, Malaysia).
  16. Numan A, Singh PS, Alam A, Khalid M, Li L, Singh S
    ACS Omega, 2022 Aug 09;7(31):27079-27089.
    PMID: 35967060 DOI: 10.1021/acsomega.2c03645
    Efficient and simple detection of chemical warfare agents (CWAs) is an essential step in minimizing the potentially lethal consequences of chemical weapons. CWAs are a family of organic chemicals that are used as chemical weapons because of their enormous severity and lethal effects when faced with unforeseen challenges. To stop the spread of CWAs, it is critical to develop a platform that detects them in a sensitive, timely, selective, and minimally invasive manner. Rapid advances in the demand for on-site sensors, metal nanoparticles, and biomarker identification for CWAs have made it possible to use fluorescence as a precise real-time and point-of-care (POCT) testing technique. For POCT-based applications, the new capabilities of micro- and nanomotors offer enormous prospects. In recent decades, significant progress has been made in the design of fluorescent sensors and the further development of noble metal nanoparticles for the detection of organophosphorus CWAs, as described in this review. Through this work, recent attempts to fabricate sensors that can detect organophosphorus CWAs through changes in their fluorescence properties have been summarized. Finally, an integrated outlook on how noble metal nanoparticles could be used to develop smart sensors for organophosphorus CWAs that communicate with and control electronic devices to monitor and improve the health of individuals.
  17. Kaur K, Sulaiman AH, Yoon CK, Hashim AH, Kaur M, Hui KO, et al.
    PMID: 32942770 DOI: 10.3390/ijerph17186730
    Mental health disorders (MHDs) among refugees has been recognized as a major public health issue. However, to date, there is limited evidence on the prevalence of MHDs among Rohingya refugees in Malaysia. This study aimed to examine the prevalence and associated factors of major depressive disorder (MDD), generalized anxiety disorder (GAD), and post-traumatic stress disorder (PTSD) among Rohingya refugees in Malaysia. A total of 220 refugees were randomly selected to participate in this cross-sectional study, conducted from June 2019 to November 2019. Perceived social support, religious orientation, food security, and sociodemographic characteristics were assessed as independent variables. The dependent variables assessed were MDD, GAD, and PTSD. The prevalence of GAD, PTSD, and MDD was reported at 92 (41.8%), 84 (38.2%), and 71 (32.3%). Several factors were significantly associated with MDD following multivariate analysis such as perceived low to moderate social support (AOR = 2.17; 95% CI 1.13, 4.19) and food insecurity (AOR = 2.77; 95% CI 1.19, 6.47). Exposure to violence (AOR = 38.46; 95% CI 16.27, 90.91) and food insecurity (AOR = 3.74; 95% CI 1.41, 9.91) were significantly associated with PTSD. Addressing these risk factors could be key in improving mental health outcomes among this vulnerable population.
  18. Singh S, Murali Sundram B, Rajendran K, Boon Law K, Aris T, Ibrahim H, et al.
    J Infect Dev Ctries, 2020 09 30;14(9):971-976.
    PMID: 33031083 DOI: 10.3855/jidc.13116
    INTRODUCTION: The novel coronavirus infection has become a global threat affecting almost every country in the world. As a result, it has become important to understand the disease trends in order to mitigate its effects. The aim of this study is firstly to develop a prediction model for daily confirmed COVID-19 cases based on several covariates, and secondly, to select the best prediction model based on a subset of these covariates.

    METHODOLOGY: This study was conducted using daily confirmed cases of COVID-19 collected from the official Ministry of Health, Malaysia (MOH) and John Hopkins University websites. An Autoregressive Integrated Moving Average (ARIMA) model was fitted to the training data of observed cases from 22 January to 31 March 2020, and subsequently validated using data on cases from 1 April to 17 April 2020. The ARIMA model satisfactorily forecasted the daily confirmed COVID-19 cases from 18 April 2020 to 1 May 2020 (the testing phase).

    RESULTS: The ARIMA (0,1,0) model produced the best fit to the observed data with a Mean Absolute Percentage Error (MAPE) value of 16.01 and a Bayes Information Criteria (BIC) value of 4.170. The forecasted values showed a downward trend of COVID-19 cases until 1 May 2020. Observed cases during the forecast period were accurately predicted and were placed within the prediction intervals generated by the fitted model.

    CONCLUSIONS: This study finds that ARIMA models with optimally selected covariates are useful tools for monitoring and predicting trends of COVID-19 cases in Malaysia.

  19. Meyts I, Bousfiha A, Duff C, Singh S, Lau YL, Condino-Neto A, et al.
    Front Immunol, 2020;11:625753.
    PMID: 33679719 DOI: 10.3389/fimmu.2020.625753
  20. Prakash C, Pramanik A, Basak AK, Dong Y, Debnath S, Shankar S, et al.
    Materials (Basel), 2021 Mar 30;14(7).
    PMID: 33808311 DOI: 10.3390/ma14071699
    In the present research work, an effort has been made to explore the potential of using the adhesive tapes while drilling CFRPs. The input parameters, such as drill bit diameter, point angle, Scotch tape layers, spindle speed, and feed rate have been studied in response to thrust force, torque, circularity, diameter error, surface roughness, and delamination occurring during drilling. It has been found that the increase in point angle increased the delamination, while increase in Scotch tape layers reduced delamination. The surface roughness decreased with the increase in drill diameter and point angle, while it increased with the speed, feed rate, and tape layer. The best low roughness was obtained at 6 mm diameter, 130° point angle, 0.11 mm/rev feed rate, and 2250 rpm speed at three layers of Scotch tape. The circularity error initially increased with drill bit diameter and point angle, but then decreased sharply with further increase in the drill bit diameter. Further, the circularity error has non-linear behavior with the speed, feed rate, and tape layer. Low circularity error has been obtained at 4 mm diameter, 118° point angle, 0.1 mm/rev feed rate, and 2500 RPM speed at three layers of Scotch tape. The low diameter error has been obtained at 6 mm diameter, 130° point angle, 0.12 mm/rev feed rate, and 2500 rpm speed at three layer Scotch tape. From the optical micro-graphs of drilled holes, it has been found that the point angle is one of the most effective process parameters that significantly affects the delamination mechanism, followed by Scotch tape layers as compared to other parameters such as drill bit diameter, spindle speed, and feed rate.
Filters
Contact Us

Please provide feedback to Administrator (afdal@afpm.org.my)

External Links