This paper deals with the problem of user-server assignment in online social network systems. Online social network applications such as Facebook, Twitter, or Instagram are built on an infrastructure of servers that enables them to communicate with each other. A key factor that determines the facility of communication between the users and the servers is the Expected Transmission Time (ETT). A ...

This paper compares environmental and profitability outcomes for a centralized biorefinery for cellulosic ethanol that does all processing versus a biorefinery linked to a decentralized array of local depots that pretreat biomass into concentrated briquettes. The analysis uses a spatial bioeconomic model that maximizes profit from crop and energy products, subject to the requirement that the bi...

We implement two distributed execution systems one centralized and one decentralized. We test these systems in terms of how well they handle a high number of requests, distribute execution, and tolerate heterogeneity. Given the small size and homogeneity of our lab environment we find that the centralized system provides a much simpler yet equally effective alternative to the decentralized syst...

while conventional data envelopment analysis models set targets separately for each decision making unit, centralized recourse allocation model is presented where there is a centralized decision maker that supervises all the operating units. optimizing of total input consumption and total output production is the main aim of this model. in this paper, firstly the centralized output production m...

In this paper, we aim at presenting an implementation of a new agent IDS (Intrusion Detection System) model, based on misuse approach. Through its ease to detect simulated attacks, we show that the use of mobile agents has practical advantages for intrusion detection. Based on a set of simulated intrusions, we established a comparative experimental study of four IDSs, showing that most of curre...

This paper investigates the centralized resource allocation with centralized structures by using the data envelopment analysis-ratio (DEA-R) models. To this end, it proposes a method to determine the resource allocation of centralized structures such that the ratio of inputs to outputs are minimized.

Multicast communication will be the communication paradigm of future networks. Secure multicasting is a challenging issue. The main objective of secure multicasting is to distribute the group key to the current members of the group in a scalable manner with minimum overheads. The key distribution methods can be either centralized or distributed. Of these, the centralized methods are simple and ...

The paper deals with multi-robot centralized autonomous area exploration of unknown environment with static obstacles. A simple reasoning algorithm based on preassignment of routing priority is proposed. The algorithm tracks the frontiers and assigns the robots to the frontiers when the robots fall into a trap situation. The algorithm is simulated with various multi-robotic configurations in di...

We propose a communicationally and computationally efficient algorithm for high-dimensional distributed sparse learning. At each iteration, local machines compute the gradient on local data and the master machine solves one shifted l1 regularized minimization problem. The communication cost is reduced from constant times of the dimension number for the state-of-the-art algorithm to constant tim...