TY - CONF
AB - We present a randomized incremental algorithm for computing a single face in an arrangement of n line segments in the plane that is fairly simple to implement. The expected running
time of the algorithm is O (nα(n) log n). The analysis of the algorithm uses a novel approach that generalizes and extends the Clarkson-Shor analysis technique.
AU - Chazelle, Bernard
AU - Herbert Edelsbrunner
AU - Guibas, Leonidas
AU - Sharir, Micha
AU - Snoeyink, Jack
ID - 4058
TI - Computing a face in an arrangement of line segments
ER -
TY - CONF
AB - Let P be a simple polygon with n vertices. We present a simple decomposition scheme that partitions the interior of P into O(n) so-called geodesic triangles, so that any line segment interior to P crosses at most 2 log n of these triangles. This decomposition can be used to preprocess P in time O(n log n) and storage O(n), so that any ray-shooting query can be answered in time O(log n).The algorithms are fairly simple and easy to implement. We also extend this technique to the case of ray-shooting amidst k polygonal obstacles with a total of n edges, so that a query can be answered in O(radicklog n) time.
AU - Chazelle, Bernard
AU - Herbert Edelsbrunner
AU - Grigni, Michelangelo
AU - Guibas, Leonidas
AU - Hershberger, John
AU - Sharir, Micha
AU - Snoeyink, Jack
ID - 4059
TI - Ray shooting in polygons using geodesic triangulations
VL - 510
ER -
TY - JOUR
AB - We present an algorithm to compute a Euclidean minimum spanning tree of a given set S of N points in Ed in time O(Fd (N,N) logd N), where Fd (n,m) is the time required to compute a bichromatic closest pair among n red and m green points in Ed . If Fd (N,N)=Ω(N1+ε), for some fixed e{open}>0, then the running time improves to O(Fd (N,N)). Furthermore, we describe a randomized algorithm to compute a bichromatic closest pair in expected time O((nm log n log m)2/3+m log2 n+n log2 m) in E3, which yields an O(N4/3 log4/3 N) expected time, algorithm for computing a Euclidean minimum spanning tree of N points in E3. In d≥4 dimensions we obtain expected time O((nm)1-1/([d/2]+1)+ε+m log n+n log m) for the bichromatic closest pair problem and O(N2-2/([d/2]+1)ε) for the Euclidean minimum spanning tree problem, for any positive e{open}.
AU - Agarwal, Pankaj K
AU - Herbert Edelsbrunner
AU - Schwarzkopf, Otfried
AU - Welzl, Emo
ID - 4061
IS - 1
JF - Discrete & Computational Geometry
TI - Euclidean minimum spanning trees and bichromatic closest pairs
VL - 6
ER -
TY - JOUR
AB - We prove that for any set S of n points in the plane and n3-α triangles spanned by the points in S there exists a point (not necessarily in S) contained in at least n3-3α/(c log5 n) of the triangles. This implies that any set of n points in three-dimensional space defines at most {Mathematical expression} halving planes.
AU - Aronov, Boris
AU - Chazelle, Bernard
AU - Herbert Edelsbrunner
AU - Guibas, Leonidas J
AU - Sharir, Micha
AU - Wenger, Rephael
ID - 4062
IS - 1
JF - Discrete & Computational Geometry
TI - Points and triangles in the plane and halving planes in space
VL - 6
ER -
TY - CONF
AB - We extend the specification language of temporal logic, the corresponding verification framework, and the underlying computational model to deal with real-time properties of concurrent and reactive systems. A global, discrete, and asynchronous clock is incorporated into the model by defining the abstract notion of a real-time transition system as a conservative extension of traditional transition systems: qualitative fairness requirements are replaced (and superseded) by quantitative lower-bound and upperbound real-time requirements for transitions. We show how to model real-time systems that communicate either through shared variables or by message passing, and how to represent the important real-time constructs of priorities (interrupts), scheduling, and timeouts in this framework. Two styles for the specification of real-time properties are presented. The first style uses bounded versions of the temporal operators; the real-time requirements expressed in this style are classified ...
AU - Thomas Henzinger
AU - Manna, Zohar
AU - Pnueli,Amir
ID - 4508
TI - Temporal proof methodologies for real-time systems
ER -
TY - THES
AU - Thomas Henzinger
ID - 4516
TI - The Temporal Specification and Verification of Real-time Systems
ER -
TY - JOUR
AU - Alur, Rajeev
AU - Thomas Henzinger
ID - 4592
IS - 3
JF - SIGACT News
TI - Time for logic
VL - 22
ER -
TY - CONF
AU - Alur, Rajeev
AU - Feder, Tomás
AU - Thomas Henzinger
ID - 4621
TI - The benefits of relaxing punctuality
ER -
TY - JOUR
AB - An ultra-low dose (10-14 M) of opioid peptide [D-Ala2]methionine enkephalinamide (DAMEA) is found to exert an inhibitory effect on the production of reactive oxygen species (respiratory burst) in human neutrophils. The validity of this phenomenon has been verified in a series of studies that comprised 30 experiments. The inhibition has proved to be statistically significant (P<0.001). The dose-response dependence of the effect (10-15-10-9 M) followed a characteristic biphasic pattern (with the maximum effect at ultra-low doses). An opioid antagonist, naloxone partially blocks the inhibitory effect, which indicates that the DAMEA action is at least partially mediated by opioid receptors.
AU - Zaǐtsev, Sergei V
AU - Leonid Sazanov
AU - Koshkin, Aleksei A
AU - Sud'Ina, Galina F
AU - Varfolomeev, Sergei D
ID - 1946
IS - 1
JF - FEBS Letters
TI - Respiratory burst inhibition in human neutrophils by ultra-low doses of [D-Ala2] methionine enkephalinamide
VL - 291
ER -
TY - JOUR
AB - Two types of metabolically regulated K channels have been identified for the first time in enzymatically demyelinated fibres of amphibian sciatic nerve using the patch-clamp technique. A maxi K channel with a single-channel conductance of 132 pS (105 mM K on both sides of the membrane, 15°C) is activated both by micromolar concentrations of internal Ca and by depolarization. A second type of K channel with a conductance of 44 pS is inhibited by intracellular adenosine 5'-triphosphate (ATP) with a half-maximal inhibitory concentration (IC50) of 35 μM. It is blocked by submicromolar concentrations of external glibenclamide. Both channels are sensitive to external tetraethylammonium chloride (IC50 = 0.2 mM for the maxi K channel and 4.2 mM for the ATP-sensitive channel). They may be part of a complex feedback system regulating axonal excitability under various metabolic conditions.
AU - Peter Jonas
AU - Koh, Duk S
AU - Kampe, Knut
AU - Hermsteiner, Markus
AU - Vogel, Werner
ID - 3468
IS - 1-2
JF - Pflugers Archiv : European Journal of Physiology
TI - ATP-sensitive and Ca-activated K channels in vertebrate axons: novel links between metabolism and excitability
VL - 418
ER -