In this paper, loss probabilities and steady state probabilities of data packets for an asynchronous transfer mode (ATM) network are investigated under the buffer division and push-out schemes. Data packets are classified in classes k which arrive in Poisson fashion to the service facility and are served with general service rate under buffer division scheme, finite buffer space N is divided in...

In this paper, a markovian queue with two types of servers and buffer space is considered. The resequencing constraint is imposed according to which the customers leave the system in the same order in which they entered it. For finite buffer queue, the steady state queue size distribution has been obtained.? 

The environmental concern, ensuring comfort for occupants, pushed us to search for the impact of glazed loggia on thermal comfort of adjacent space in Cons tantine climate, having s trong climatic cons traints. An experimental s tudy is undertaken and described in this paper. Analysis of the in situ results is also discussed. This work shows that in winter glazed loggia benefit largely from sol...

This paper puts forward a safe mechanism of data transmission to tackle the security problem of information which is transmitted in Internet. We propose a new technique on matrix scrambling which is based on random function, shifting and reversing techniques of circular queue. We give statistical analysis, sequence random analysis, and sensitivity analysis to plaintext and key on the proposed s...

Buffer space in packet switching nodes is an important network resource. Shared buffer switches are prone to high packet losses and unfair use of buffer space. The use of a buffer management scheme is necessary to overcome these problems. This paper investigates the performance of Sigmoid Function Threshold scheme by means of simulations. This scheme regulates the usage of shared buffer space b...

In an N x N shared buffer switch architecture, a common buffer space is shared among output ports, which provides flexibility in resource allocation. However the problem arises when the buffer space is dominated by one or more output ports in case of imbalanced input traffic. Thus this results in an increased packet loss rates due to unfair sharing of buffer space. For this reason buffer manage...

Address space layout randomization (ASLR) is a security technology to prevent exploitations of buffer overflows. But this technology is far from perfect. ”[...] its only up to the creativity of the attacker what he does. So it raises the bar for us all :) but just might make writing exploits an interesting business again.” ([Dul00] about ASLR). This paper is an introduction and a reference abou...

One major drawback of multipath transferring schemes, which is inspired by the usage of different paths with diverse delays, is the emergence of reordering among packets of a flow. This reordering brings some substantial problems (like larger delay and buffer space) to the transport applications. In this paper, we present a novel UDP-based multipath scheme for in-order delivery to the receiver ...

ABSTRACT We onsider the problem of bu er spa e allo ation in a multi-hop store-and-forward network and study the tradeo s between the amount of bu er spa e alloted to the endpoints of a virtual ir uit and that assigned to the ore nodes, i.e., routers. Simulation results hint at the possibility that the single-path paradigm of implementing networklayer virtual ir uits is fundamentally awed (rath...

This paper describes efficient algorithms for determining how buffer space should be allocated in a flow line. We analyze two problems: a primal problem, which minimizes total buffer space subject to a production rate constraint; and a dual problem, which maximizes production rate subject to a total buffer space constraint. The dual problem is solved by means of a gradient method, and the prima...