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There are a number of applications for which it is desirable to divide a given region in the plane into nicely shaped triangles. One important such application is the finite element method, a method widely used to obtain approximate solutions to a wide variety of engineering problems. For this kind of application, not just any triangulation will do; error… (More)

- Paul Chew
- Symposium on Computational Geometry
- 1986

Given a set S of points in the plane, there is a triangulation of S such that a path found within this triangulation has length bounded by a constant times the straight-line distance between the endpoints of the path. Specifically, for any two points a and b of S there is a path along edges of the triangulation with length less than √10 times |ab|,… (More)

- Paul Chew
- J. Comput. Syst. Sci.
- 1989

- Juan Xu, Opas Chutatape, Paul Chew
- IEEE Trans. Biomed. Engineering
- 2007

This paper presents a novel deformable-model-based algorithm for fully automated detection of optic disk boundary in fundus images. The proposed method improves and extends the original snake (deforming-only technique) in two aspects: clustering and smoothing update. The contour points are first self-separated into edge-point group or uncertain-point group… (More)

- Winifred P Nolan, Jovina L-S See, +6 authors Tin Aung
- Ophthalmology
- 2007

OBJECTIVE
To evaluate noncontact anterior segment optical coherence technology (AS-OCT) as a qualitative method of imaging the anterior chamber angle and to determine its ability to detect primary angle closure when compared with gonioscopy in Asian subjects.
DESIGN
Prospective observational case series.
PARTICIPANTS
Two hundred three subjects were… (More)

- Noor Shabana, Maria Cecilia Aquino, +9 authors Paul Chew
- Clinical & experimental ophthalmology
- 2012

BACKGROUND
To evaluate different mechanisms of primary angle closure and to quantify anterior chamber parameters in these mechanisms using anterior segment optical coherence tomography in an Asian population.
DESIGN
Hospital-based cross-sectional observational study.
PARTICIPANTS
Forty-eight consecutive patients with primary angle closure glaucoma.
… (More)

- Eranga Nishanthie Vithana, Chiea Chuen Khor, +76 authors Tin Aung
- Nature Genetics
- 2012

Primary angle closure glaucoma (PACG) is a major cause of blindness worldwide. We conducted a genome-wide association study including 1,854 PACG cases and 9,608 controls across 5 sample collections in Asia. Replication experiments were conducted in 1,917 PACG cases and 8,943 controls collected from a further 6 sample collections. We report significant… (More)

- Paul Chew, Keith Marzullo
- SRDS
- 1991

When a computer monitors a physical process, it uses sensors to determine the values of the physical variables that represent the state of the process. A sensor can fail, however, and in the worst case report a value completely unrelated to the true physical value. The work described in this paper is motivated by a methodology for transforming a process… (More)

- Paul Chew
- STOC
- 1981

A term rewriting system is a finite set of axiom schemata of the form <italic>A@@@@B</italic> where <italic>A</italic> and <italic>B</italic> are terms that contain variables. An important question for such systems is whether normal forms are unique (i.e. each term has at most one normal form). For schemata without repeated variables (i.e. no variable is… (More)

- Steve K. L. Seah, P. J. Foster, +4 authors Andriew S. Lim
- Archives of ophthalmology
- 1997

OBJECTIVES
To determine the incidence of acute primary angle-closure glaucoma (APACG) in Singapore and to identify demographic and meteorological risk factors.
DESIGN
A prospective, island-wide incidence study.
SETTING
All government and private ophthalmological practices in Singapore, from March 1, 1995, to February 29, 1996.
METHODS
New cases of… (More)