Absfrucf -Retransmission policies are presented for the decentralized control of a multiaccess packet-switched broadcast channel. The policies have a simple recurSiYe form yielding a Markov description of the system. Finite average delay is achieved for an infinite-population Poisson arrival model for any rate X < e ’ . It is proposed that the goal of retransmission policies should be to...

Recently, several policies have been proposed for scheduling multiple Continuous Queries (CQs) in a Data Stream Management System (DSMS). The decision on which policy to use plays an important role in shaping the percieved online performance provided by the DSMS. In this tutorial, we provide an overview of different policies employed by current CQ schedulers and the performance goals optimized ...

Network security should be based around security policies. From high-level natural language, non-technical, policies created by management, down to device and vendor specific policies, or configurations, written by network system administrators. There exists a multitude of research into policy-based network systems which has been undertaken. This paper provides an overview of the different type...

BACKGROUND Citation data can be used to evaluate the editorial policies and procedures of scientific journals. Here we investigate citation counts for the three different publication tracks of the Proceedings of the National Academy of Sciences of the United States of America (PNAS). This analysis explores the consequences of differences in editor and referee selection, while controlling for th...

Proceso editorial, justicia 1 (peor) 6 2,8 2 26 12 3 59 27,3 4 93 43,1 Durante el año 2012, el equipo editorial de Gaceta Sanitaria iseñó y envió una encuesta a los 2760 socios y socias de SESPAS. l cuestionario se diseñó en formato online y se envió por correo lectrónico a través de SESPAS en dos rondas: el primer envío se fectuó el 17 de abril y el segundo el 3 de mayo. Posteriormente e puso ...

although many scholars had proposed lots research results about online shopping, they are quite vague and hard for enterprisers to practice it. hence, this research observes the online store policies, services, functions, and activities among 17 online shopping platforms in taiwan, china, and hong kong. and, this research (1) finds online stores assessment items by literature review; (2) establ...

A simulation model must be used to evaluate the impact of new operations policies, not only to validate the policies, but also as a tool to convince the decision-makers of the potential advantages in adopting the proposed enhancements in the management. Terminal resource allocation policies and ship loading/unloading policies are obtained by means of Operations Research techniques for the case ...

In this paper, we study an age of information minimization problem, where multiple flows of update packets are sent over multiple servers to their destinations. Two online scheduling policies are proposed. When the packet generation and arrival times are synchronized across the flows, the proposed policies are shown to be (near) optimal for minimizing any timedependent, symmetric, and non-decre...

Publication and reuse of machine-readable data on the Web is one of the current trends in data management that is mainly manifested by the Open Data movement. This movement is especially strong in the government and public sector domain where many Open Government Data initiatives have been launched in a large number of countries across the globe. In the European Union the recent update of the P...