نتایج جستجو برای: collision probability

تعداد نتایج: 264069  

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2013
Michel Vosskuhle Emmanuel Lévêque Michael Wilkinson Alain Pumir

In turbulent suspensions, collision rates determine how rapidly particles coalesce or react with each other. To determine the collision rate, many numerical studies rely on the ghost collision approximation (GCA), which simply records how often pairs of point particles come within a threshold distance. In many applications, the suspended particles stick (or in the case of liquid droplets, coale...

2016
Chonhyon Park Jae Sung Park Dinesh Manocha

We present a novel approach to performing probabilistic collision detection between a high-DOF robot and imperfect obstacle representations in dynamic, uncertain environments. These uncertainties are modeled using Gaussian distributions. We present an efficient algorithm for bounded collision probability approximation. We use our probabilistic collision algorithm for trajectory optimization in ...

2003
Rui Fukui Hiroshi Morishita Tomomasa Sato

In this paper, a novel describing method of human locomotion trajectory record was proposed, and methods of its application to the path planning and control of human-symbiotic mobile robots were indicated. The novel describing method, named as Existence Record Probability Map (abbreviated ERPM hereafter), was generated through the following three steps: 1) measuring human locomotion path using ...

2012
Mohammad Ali Orumiehchiha Josef Pieprzyk Ron Steinfeld

RC4-Based Hash Function is a new proposed hash function based on RC4 stream cipher for ultra low power devices. In this paper, we analyse the security of the function against collision attack. It is shown that the attacker can find collision and multi-collision messages with complexity only 6 compress function operations and negligible memory with time complexity 2. In addition,we show the hash...

2005
John Erik Mathiassen

In this paper we present an improvement of the collision attack [1] on the authenticated encryption mode of operation OCB. [1] presents a detection of collision method and a way to use the collision, and it is possible to use the information from a collision to change some blocks of the message unnoticed, if they have a special property. We found a way to use the information from a collision to...

Asghar Charmin Mohammad Yahaghifar

Most accidents happens because of lack of Visibility and not Driver’s reaction on time whenan accident occurs. Increasing required Time for driver’s reaction caused to decreasingaccidents on roadways .intelligent vehicle networks brings enough time for reaction by sendingalert and alternate messages to vehicles on roadway. Main propose in this paper is aroundmodulation on Reception interval Saf...

2008
Ivica Nikolic Alex Biryukov

In this article we find collisions for step-reduced SHA-256. We develop a differential that holds with high probability if the message satisfies certain conditions. We solve the equations that arise from the conditions. Due to the carefully chosen differential and word differences, the message expansion of SHA-256 has little effect on spreading the differences in the words. This helps us to fin...

Journal: :IEEE Trans. Parallel Distrib. Syst. 2000
Koji Nakano Stephan Olariu

ÐAd hoc networks are self-organizing entities that are deployed on demand in support of various events including collaborative computing, multimedia classroom, disaster-relief, search-and-rescue, interactive mission planning, and law enforcement operations. One of the fundamental tasks that have to be addressed when setting up an ad hoc network (AHN, for short) is initialization. This involves ...

2002
S. Blei C. A. Ho M. Sommerfeld

A stochastic droplet collision model (Sommerfeld [9]), based on the creation of a fictitious collision partner is described, taking into account impact efficiencies. The model of O’Rourke [5] is considered to predict the outcome of water-droplet collisions, being grazing or coalescing, and to predict post-collision velocities. The relevance of impact efficiencies is discussed for water droplet ...

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