This paper presents simulation and analysis of constraint-based routing (CR) with MPLS (multiprotocol label switching). MPLS is basically a fast forwarding scheme for the core of the Internet. Constraint-based routing computes routes that are subject to constraints to meet QoS (quality of service) requirements. Constraint-based routing with MPLS greatly enhances network utilization and enables ...

This paper presents a novel algorithm for the gateway placement problem in Backbone Wireless Mesh Networks (BWMNs). Different from existing algorithms, the new algorithm incrementally identifies gateways and assigns mesh routers to identified gateways. The new algorithm can guarantee to find a feasible gateway placement satisfying Quality-of-Service (QoS) constraints, including delay constraint...

In mobile ad hoc peer-to-peer (M-P2P) networks, economic models become a necessity for enticing non-cooperative mobile peers to provide service. M-P2P users may issue queries with varying constraints on query response time, data quality of results and trustworthiness of the data source. Hence, we propose ConQuer, which is an economic incentive model for the efficient processing of constraint qu...

Along with the intensification of global competition and the complexity of manufacturing products, cooperation among enterprises becomes more intimately, and the range of quality control extends from internal to the external enterprises. Consequently, previous quality control methods for internal enterprise have been difficult to meet the demands of extended enterprises. To effectively realize ...

The inconsistency of the beliefs citizens have about political issues is neither a new nor a surprising finding for political scientists (Converse 1964). Still at least from a normative point of view attitude constraint is a desideratum that is important for the quality of electoral decisions and ultimately for the quality of democracy (Friedman 2006). Under these circumstances it is not surpri...

An important task of IT service management with respect to the service life cycle is to plan the provision of services in a management environment. The goal is to provide services to customers with a high quality of service by optimizing the use of resources necessary for the realization of the services. IT service managers are constantly confronted with ”look-ahead” problems, like how many new...

Service Level Agreements are a key issue in Service Oriented Computing. SLA contracts specify client requirements and service guarantees, with emphasis on Quality of Service (cost, performance, availability, etc.). In this work we propose a simple model of contracts for QoS and SLAs that also allows to study mechanisms for resource allocation and for joining different SLA requirements. Our lang...

The recent deregulation occurred in the public railway sector in many parts of the world has increased the awareness of this sector of the need for quality service that must be o ered to its customers. In this paper, we present a software system for solving and plotting the Single-Track Railway Scheduling Problem e ciently and quickly. The problem is formulated as a Constraint Satisfaction Prob...