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- Ahmed M. Assaf
- J. Comb. Theory, Ser. A
- 1994

- Ahmed M. Assaf
- Australasian J. Combinatorics
- 1997

It is shown here that the necessary conditions for the existence of MGD[4, A m, n] for A ~ 2 are sufficient with the exception of MGO(4, 3, 6,23].

- Ahmed M. Assaf, Nabil Shalaby, Jianxing Yin
- Discrete Mathematics
- 2001

- Ahmed M. Assaf
- Des. Codes Cryptography
- 1995

Let V be a finite set of order u. A (v, ~c, Z) covering design of index ;~ and block size tc is a collection of ~c-element subsets, called blocks, such that every 2-subset of V occurs in at least L blocks. The covering problem is to determine the minimum number of blocks, c~(u, x, ~.), in a covering design. It is well known that c~(u, x, )~) > r v r v-t ~]l… (More)

- Ahmed M. Assaf, Nabil Shalaby, Jianxing Yin
- Australasian J. Combinatorics
- 1998

Let v ~ 5 and A be positive integers and let DD(v,k,A) denote the packing number of a directed packing with block size 5 and index A. The values of DD(v, 5, A) have been determined for A = 1,2 with the possible exceptions of (v, A) = (15,1) (19,1) (27,1), [7,8, 19]. In this paper we determine the values of DD(v, 5, A) for all v ~ 5 and A ~ 3 except possibly… (More)

- Ahmed M. Assaf, Nabil Shalaby, L. P. S. Singh
- Ars Comb.
- 1997

- Ahmed M. Assaf, Alan Hartman
- Discrete Mathematics
- 1990

- Ahmed Assaf, Ahmed Kotb
- International Ophthalmology
- 2014

To assess the efficacy and stability of simultaneous topography-guided photorefractive keratectomy (PRK) and crosslinking (Athens protocol) followed by phakic intraocular lens (IOL) implantation for managing keratoconus. Ain-Shams University, Cairo, Egypt. Prospective non-randomized study. All patients underwent topography-guided PRK followed immediately by… (More)

- Ahmed M. Assaf, Ruizhong Wei
- Discrete Mathematics
- 1999

- Ahmed Assaf, Ahmed Kotb
- Journal of cataract and refractive surgery
- 2010

PURPOSE
To study spherical aberration, coma, and trefoil after implantation of a single-piece aspheric Tecnis intraocular lens (IOL) in cataract patients and the influence on photopic and mesopic contrast sensitivity.
SETTING
Ophthalmology Department, Ain-Shams University Hospitals, Cairo, Egypt.
METHODS
In this randomized prospective contralateral… (More)