Let S be a set of n points in Rd in general position. A set H of k-flats is called an mk-stabber of S if the relative interior of any m-simplex with vertices in S is intersected by at least one element of H. In this paper we give lower and upper bounds on the size of minimum mk-stabbers of point sets in Rd and in general position. We study mainly mk-stabbers in the plane and in R3.

The present paper targets uncertainties of wave-induced rigid-body ship responses with a focus on global wave loads. review presents general concepts and modelling the uncertainty in linear non-linear low-frequency relevance these for practical applications shipping industry as rule development process, structural reliability analysis, uncertainty-based decision support systems, health monitori...

Underwater navigation presents crucial issues because of the rapid attenuation electronic magnetic waves. The conventional underwater methods are achieved by acoustic equipment, such as ultra-short-baseline localisation systems and Doppler velocity logs, etc. However, they suffer from low fresh rate, bandwidth, environmental disturbance high cost. In paper, a novel visual is investigated based ...

Abstract The main function of the fin stabilizer on patrol boats is anti-rolling and providing comfort for ship personnel. However, installation has a consequence in form appendage resistance ship. This study analyzes magnitude due to NACA 0010 mounted 60m boat at an angle 0º. Reduction expected improve performance which then can optimize use fuels minimize pollution. In early stages, bare hull...

Active illumination underwater brings the backscatter problem. The traditional pulsed laser range-gated imaging (PLRGI) system uses a small gate width to suppress most of backscattered light. As result, depth field (DOF) PLRGI is small. In addition, DOF has be extended when used for searching target. There are several methods extend DOF. However, every method its shortcoming. To overcome these ...

Large water tanks known as towing tanks, wave basins and cavitation tunnels, are used to determine the performance of ships, boats submarines at model-scale. They may also be for noise measurements but suffer from effects reverberation, which makes it difficult capture free field conditions necessary complete characterisation noise. This paper describes an adapted Image Source Model its use und...

Weighted sled towing is a common resisted sprint training technique even though relatively little is known about the effects that such practice has on sprint kinematics. The purpose of this study was to explore the effects of sled towing on acceleration sprint kinematics in field-sport athletes. Twenty men completed a series of sprints without resistance and with loads equating to 12.6 and 32.2...

An excessive load in resisted sprint training can produce changes in running patterns. Therefore, load control is essential to ensure the specificity of these training methods. The most common way to control it is through the percentage of velocity lost in relation to maximum velocity. The present paper describes a study that aimed to establish the load for sprint training with sled towing. The...