We consider the k-payment problem: given a total budget of N units, represent this budget as a set of coins, so that any k exact payment requests of total value at most N can be made using k disjoint subsets of the coins. The goal is to minimize the number of coins for any given N and k The actual payments are made on-line, namely without knowing all payment requests in advance. Our motivation ...

We consider the k-payment problem: given a total budget of N units, the problem is to represent this budget as a set of coins, so that any k exact payments of total value at most N can be made using k disjoint subsets of the coins. The goal is to minimize the number of coins for any givenN and k, while allowing the actual payments to be made on-line, namely without the need to know all payment ...

The principal objective of this study was to investigate the prevalence of toxoplasmosis in household and stray cats in Seoul, Republic of Korea. We collected blood samples from 72 stray and 80 household cats, and all samples were examined by ELISA and nested PCR. The overall positive rates of Toxoplasma gondii in stray cats were 38.9% (28/72), with 15.3% (11/72) in ELISA and 30.6% (22/72) in P...

We consider combinatorial and computational issues that are related to the problem of moving coins from one configuration to another. Coins are defined as non-overlapping discs, and moves are defined as collision free translations, all in the Euclidean plane. We obtain combinatorial bounds on the number of moves that are necessary and/or sufficient to move coins from one configuration to anothe...

Abstract. We introduce the k-payment problem: given a total budget of N units, the problem is to represent this budget as a set of coins, so that any k exact payments of total value at most N can be made using k disjoint subsets of the coins. The goal is to minimize the number of coins for any given N and k, while allowing the actual payments to be made on-line, namely without the need to know ...

On suppose le domaine Ω régulier. Justi er que les solutions propres sont aussi régulières, préciser cette régularité. Noter bien (on ne demande pas de le justi er) que si le domaine possède des coins, les solutions propres peuvent, comme pour le problème de Laplace avec un second membre, présenter des singularités aux coins du domaine. En dehors de ces coins, la solution est par contre de clas...

PURPOSE To compare directly the robustness of standard automated perimetry (SAP), short-wavelength automated perimetry (SWAP), frequency-doubling perimetry (FDP), and grating-resolution perimetry (GRP) stimuli to different degrees of intraocular stray light induced by commercially available opacity-containing filters. METHODS Five white opacity filters of increasing density were used to simul...

Magnetic stray fields of Co-Cr microstrips are investigated for bit stabilization in a vertical Bloch line memory (VBLM). The stray fields were revealed using Lorentz force based Foucault and differential phase contrast (DPC) techniques in a transmission electron microscope. The assumed shape of the stray fields for VBLM use has been experimentally verified. Agreement between experiment and sim...

BACKGROUND Stray bullet shootings contribute to a sense of risk in affected communities but have rarely been studied. We describe the epidemiology and clinical aspects of stray bullet shootings in the United States. METHODS We defined a case as a shooting event involving death or injury to a person and meeting criteria for a stray bullet mechanism of injury. From March 1, 2008, to February 28...