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Your search keyword '"Yap, E."' showing total 444 results
Start Over Author "Yap, E." Publication Type Academic Journals
444 results on '"Yap, E."'

37. Modification of the mechanical and optical properties of a polycarbonate by 50 keV Ar+ and H+ ion implantation

Author

Yap, E., McCulloch, D.G., McKenzie, D.R., Swain, M.V., Wielunski, L.S., and Clissold, R.A.

Subjects
Ion implantation -- Research, Polymers -- Optical properties, Physics
Abstract

A study was conducted on the influence of 50 keV H+ and Ar+ ions on the ultraviolet-visible absorption and mechanical properties of the CR39 polymer. The results show that H+ implantation generates a yellow-brown material with amorphous hydrogenated carbon-like optical properties. The results also reveal that Ar+ implantation yields an evaporated amorphous carbon-like material.

Published
1998

44. A Chronological Review of Key Establishment Models and Protocols.

Author

Yap, E. Y. Y., Chin, J. J., and Goh, A.

Subjects
*SECURITY management
Abstract

This work is a review on existing authenticated key exchange (AKE) security models and protocols mainly based on Diffie-Hellman Key Exchange (DHKE). We provide a discussion on the various security models of AKEs, such as the Bellare Rogaway (BR) model, Canetti Krawczyk (CK) model and their variants. Then we provide a review covering over ninety protocols in chronological order. The security models' security features and protocol examples that fit in those security models are exhibited. [ABSTRACT FROM AUTHOR]

Published
2021

46. Fever as a predictor of adverse outcomes in COVID-19.

Author

Chew, N W, Ngiam, J N, Tham, S M, Lim, Z Y, Li, T Y W, Cen, S, Yap, E S, Tambyah, P A, Santosa, A, Cross, G B, and Sia, C -H

Subjects
FEVER, INTENSIVE care units, COVID-19, ASYMPTOMATIC patients, C-reactive protein
Abstract

Background/Introduction There are little data on outcomes of COVID-19 patients with the presence of fever compared to the presence of symptoms. Aim We examined the associations between symptomology, presence of fever and outcomes of a COVID-19 cohort. Design and Methods Between 23 January and 30 April 2020, 554 COVID-19 patients were admitted to a tertiary hospital in Singapore. They were allocated into four groups based on symptomology and fever—Group 1: asymptomatic and afebrile, Group 2: symptomatic but afebrile, Group 3: febrile but asymptomatic and Group 4: symptomatic and febrile. The primary outcomes were intensive care unit (ICU) admissions and mortality. The composite end-point included ICU admissions, mortality or any COVID-19 related end-organ involvement. Results There were differences in ferritin (P =0.003), C-reactive protein (CRP) levels (P <0.001) and lymphopenia (P =0.033) across all groups, with the most favourable biochemical profile in Group 1, and the least in Group 4. Symptomatic groups (Groups 2 and 4) had higher ICU admissions (1.9% and 6.0%, respectively, P =0.003) than asymptomatic groups (Groups 1 and 3). Composite end-point was highest in Group 4 (24.0%), followed by Group 3 (8.6%), Group 2 (4.8%) and Group 1 (2.4%) (P <0.001). The presence of fever (OR 4.096, 95% CI 1.737–9.656, P =0.001) was associated with the composite end-point after adjusting for age, pulse rate, comorbidities, lymphocyte, ferritin and CRP. Presence of symptoms was not associated with the composite end-point. Discussion/Conclusion In this COVID-19 cohort, presence of fever was a predictor of adverse outcomes. This has implications on the management of febrile but asymptomatic COVID-19 patients. [ABSTRACT FROM AUTHOR]

Published
2021
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