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THE REFLEX-FREE HULL

HEE-KAP AHN, SIU-WING CHENG, OTFRIED CHEONG, JACK SNOEYINK
2004 International journal of computational geometry and applications  
We propose a hull operator, the reflex-free hull, that allows us to define a 3D analogue to bays in polygons.  ...  The reflex-free hull is related to identifying cavities in computer aided design and manufacturing, but we sketch examples to indicate that computing a reflex-free hull will be a challenging problem. *  ...  Acknowledgments We thank Herbert Edelsbrunner and Sergei Bespamyatnikh for discussions on the relation of this problem to casting and other hulls.  ... 
doi:10.1142/s0218195904001548 fatcat:2daehg46qbaa5fr7k7adupyaym

Shooting Permanent Rays among Disjoint Polygons in the Plane

Mashhood Ishaque, Bettina Speckmann, Csaba D. Tóth
2012 SIAM journal on computing (Print)  
obstacles with a total of n vertices in the plane, a permutation of the reflex vertices, and a half-line at each reflex vertex that partitions the reflex angle into two convex angles, then the convex partitioning  ...  We present a data structure for ray shooting and insertion in the free space between disjoint polygonal obstacles with a total of n vertices in the plane, where each ray starts at the boundary of some  ...  Fig. 8 . 8 (a) The reflex vertices of the free space Cu \ ( P) are marked with empty circles; the free space has two domains D 1 and D 2 .  ... 
doi:10.1137/100804310 fatcat:m2qdeqgnnnbudes7wcykr7u5jm

Shooting permanent rays among disjoint polygons in the plane

Mashhood Ishaque, Bettina Speckmann, Csaba D. Tóth
2009 Proceedings of the 25th annual symposium on Computational geometry - SCG '09  
obstacles with a total of n vertices in the plane, a permutation of the reflex vertices, and a half-line at each reflex vertex that partitions the reflex angle into two convex angles, then the convex partitioning  ...  We present a data structure for ray shooting and insertion in the free space between disjoint polygonal obstacles with a total of n vertices in the plane, where each ray starts at the boundary of some  ...  Fig. 8 . 8 (a) The reflex vertices of the free space Cu \ ( P) are marked with empty circles; the free space has two domains D 1 and D 2 .  ... 
doi:10.1145/1542362.1542372 dblp:conf/compgeom/IshaqueST09 fatcat:rfpvi5zswjhs7bceufibsedcgi

Rank 2 Sheaves on Toric 3-Folds: Classical and Virtual Counts

Amin Gholampour, Martijn Kool, Benjamin Young
2017 International mathematics research notices  
Connected components of M^T with constant reflexive hulls are isomorphic to products of P^1.  ...  Let M be the moduli space of rank 2 stable torsion free sheaves with Chern classes c_i on a smooth 3-fold X. When X is toric with torus T, we describe the T-fixed locus of the moduli space.  ...  These reflexive hulls have c 2 = 2. • The reflexive hulls of Example 4.11. Recall that these reflexive hulls have c 2 = 1.  ... 
doi:10.1093/imrn/rnw302 fatcat:m7mdw7acc5cgfb4lp3fkjd6xze

Compatibility relations on codes and free monoids

Tomi Kärki
2008 RAIRO - Theoretical Informatics and Applications  
Let X ⊆ A + be a finite set and let B be the base of the free hull of X.  ...  Let X ⊆ A + be a finite set and let B be the base of the free hull of X.  ... 
doi:10.1051/ita:2008016 fatcat:hlzbwjbadfbzblmd7qhbbhvtj4

Page 95 of The Journal of the Royal Anthropological Institute Vol. 17, Issue 1 [page]

2011 The Journal of the Royal Anthropological Institute  
for the gathering of dispersed information (Hayek 1945; Hull 2006).  ...  In the process, Hayek laid the intellectual cornerstone for the foundation of neoclassical economics (Hull 2006).  ... 

On nonstandard hulls of convex spaces

Steven F. Bellenot
1976 Canadian Journal of Mathematics - Journal Canadien de Mathematiques  
The question of invariance of nonstandard hulls being equivalent to inductive semi-reflexivity and bounded sets being precompact, is left open.  ...  If the nonstandard hulls of a TVS are independent of the non-standard model, we say that the TVS has invariant nonstandard hulls.  ...  Let N be the set of natural numbers and let X be the set or real valued functions on N with finite support. Let °U be a free ultra-filter on N.  ... 
doi:10.4153/cjm-1976-017-x fatcat:cjavemla6jbyplmkdhewvygfxm

Cutting Out Polygons with a Circular Saw [chapter]

Adrian Dumitrescu, Masud Hasan
2011 Lecture Notes in Computer Science  
This improves the previous approximation ratio of 2.5 obtained by Demaine et al. in 2001.  ...  Given a simple (cuttable) polygon Q drawn on a piece of planar material R, we cut Q out of R by a (small) circular saw with a total number of cuts no more than twice the optimal.  ...  Each pocket is defined by an edge of the convex hull, which we call the lid of the pocket. For each edge of the convex hull we make a cut along the edge.  ... 
doi:10.1007/978-3-642-25591-5_25 fatcat:hlu7swryg5baplu4aozr7fcl3u

CUTTING OUT POLYGONS WITH A CIRCULAR SAW

ADRIAN DUMITRESCU, MASUD HASAN
2013 International journal of computational geometry and applications  
This improves the previous approximation ratio of 2.5 obtained by Demaine et al. in 2001.  ...  Given a simple (cuttable) polygon Q drawn on a piece of planar material R, we cut Q out of R by a (small) circular saw with a total number of cuts no more than twice the optimal.  ...  Each pocket is defined by an edge of the convex hull, which we call the lid of the pocket. For each edge of the convex hull we make a cut along the edge.  ... 
doi:10.1142/s0218195913600030 fatcat:wpo2zovy3fb6hepu7lzsvph4di

Wind Tunnel Investigation into the Resistance Analysis of Slender Body Catamaran

I Ketut Aria Pria Utama, S Sutiyo, Bagiyo Suwasono
2020 Kapal  
Pressure around the hull was measured using pressure tappings and the flow velocity behind the hull was also measured using a Pitôt-static tube.  ...  The tests demonstrated a viscous interaction between the hulls, and form factors for the monohull and catamaran are derived.  ...  Acknowledgements The first authors wished to thank the Directorate of Research and Community Engagement (DPRM) of the Institut Teknologi Sepuluh Nopember (ITS), which funded part of the work under a research  ... 
doi:10.14710/kapal.v17i2.29867 fatcat:wn3i4j5sf5bbzjxndacgnbevyq

Numerical Investigation into the Pressure and Flow Velocity Distributions of a Slender-Body Catamaran Due to Viscous Interference Effects

I Ketut Aria Pria Utama, Wasis Dwi Aryawan, Ahmad Nasirudin, Sutiyo Sutiyo, Yanuar Yanuar
2021 International Journal of Technology  
Pressure and flow velocity around the hull were measured to obtain a fluid effect attributed to the influence of catamaran hull interference.  ...  The form factor for the catamaran was consistently higher than the demihull, suggesting some viscous interference between the hulls.  ...  Acknowledgements The authors wish to thank the Ministry of Research, Technology, and Higher Education (Kemristekdikti) and the Institut Teknologi Sepuluh Nopember (ITS) for funding the current work under  ... 
doi:10.14716/ijtech.v12i1.4269 fatcat:vwc3epe5zff75hvecmjldnhmfy

Page 65 of Psychological Bulletin Vol. 34, Issue 2 [page]

1937 Psychological Bulletin  
If the principles discovered in conditioned response 5 While Hull does not use the reflex as a building-block, his S-R diagrams indicate that this position is not entirely free from elementarism.  ...  Complex behavior is deduced from principles of action discovered in conditioned response experi- ments ; it is not synthesized by an assemblage of simple conditioned reflexes, Hull (87, p. 227).° As we  ... 

Page 65 of Psychological Bulletin Vol. 34, Issue 2 [page]

1937 Psychological Bulletin  
If the principles discovered in conditioned response 5 While Hull does not use the reflex as a building-block, his S-R diagrams indicate that this position is not entirely free from elementarism.  ...  Complex behavior is deduced from principles of action discovered in conditioned response experi- ments ; it is not synthesized by an assemblage of simple conditioned reflexes, Hull (87, p. 227).° As we  ... 

Algebra and local presentability: how algebraic are they? (A survey)

Jiří Adámek, Jiří Rosický
2017 Tbilisi Mathematical Journal  
This is a survey of results concerning the algebraic hulls of two 2-categories: VAR, the 2- category of finitary varieties, and LFP, the 2-category of locally finitely presentable categories.  ...  We are grateful to the referee for suggestions which improved our presentation.  ...  The free completion of a category K under sifted colimits is denoted Sind K 2.4 Proposition. ([7]) For every category K with finite coproducts Sind K is obtained by completing Ind K freely under reflexive  ... 
doi:10.1515/tmj-2017-0113 fatcat:7lvwu47hqbek7ob4cqnererava

Ehrhart series, unimodality, and integrally closed reflexive polytopes [article]

Benjamin Braun, Robert Davis
2014 arXiv   pre-print
In this paper, we consider integrally closed reflexive simplices and discuss an operation that preserves reflexivity, integral closure, and unimodality of the h^*-vector, providing one explanation for  ...  We also discuss the failure of proving unimodality in this setting using weak Lefschetz elements.  ...  that are the convex hull of the origin and all but one of the vertices of ∆ Q .  ... 
arXiv:1403.5378v3 fatcat:i3gf52ju4nh45jep2sb3ah4mcq
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