We investigate a model where an impurity couples to both the spin and the flavor currents of the two channel conduction electrons. This model can be used as a prototype model of a magnetic impurity tunneling between two sites in a metal and of some heavy fermion systems where the ground state of the impurity has a fourfold degeneracy. The system is shown to flow to a doubly degenerate fermi-liq...

In this paper, we report on the design of a protocol for transparent, location-independent access in mobile systems. The protocol, termed by us Mobile Client/Server Protocol (MCSP) is an implementation of a communication layer on a mobile host and a stationary machine within the wireline network, and provides middleware functionality. The MCSP supports communication services through the client/...

Multiprocessing (MP) on networks of workstations (NOW) is a high-performance computing architecture of growing importance. In traditional MP’s, wormhole routing interconnection networks use fixed-size flits and backpressure. In NOW’s, ATM −one of the major contending interconnection technologies− uses fixed-size cells, while backpressure can be added to it. We argue that ATM with backpressure h...

This paper presents a simulation analysis of the impact of mobility on concurrent transaction processing over a mixture of mobile and fixed transactions. Our results show that the traditional concurrency protocol yield low throughput in mixture mobile and fixed environments due to the fact that traditional protocol cannot discriminate implications of restart of both types of transactions. As a ...

Multicast in wireless networks received a lot of attention, from ad-hoc networks, to structured multi-hop meshes. However, the support of the standard Protocol Independent Multicast (PIM) protocol has been dismissed as non important (or non feasible), given that its straightforward application on wireless networks does not work properly. In this work we analyse the reasons why PIM standard impl...

This note presents a method to study center families of periodic orbits of complex holomorphic differential equations near singularities, based on some iteration properties of fixed point indices. As an application of this method, we will prove Needham’s theorem in a more general version. 1. Fixed point indices of holomorphic mappings Let C be the complex vector space of dimension n, let U be a...

This paper describes a reservation protocol to provide real-time services to mobile users in an Integrated Services Packet Network. Mobility of hosts has significant impact on the quality of service provided to a real-time application. The currently proposed network system architecture and mechanisms to provide real-time services to fixed hosts are inadequate to accommodate the mobile hosts whi...

This article discusses a “simplified fixed implant prosthetics” (SFIP) protocol that offers the entire implant team simplicity and increased predictability for fixed implant prosthetics.1 The restorative dentist only has to take a crown and bridge impression to provide the final fixed implant prosthesis. The protocol involves the implant surgeon following a 2-step process of making an index imp...