Tolerance analysis is a valuable tool for reducing manufacturing costs by improving producibility. Several useful methods of selecting design tolerances are presented with examples. The common and more advanced tolerance analysis methods are also reviewed and evaluated. A simple new tolerance analysis model suitable for designers is described as an alternative to the advanced methods. It is muc...

Traditional practice to tolerance design has been based on a sequential approach to design and manufacturing considerations. An integrated approach involving simultaneous selection of design and manufacturing tolerances was introduced in the last decade. Choice of manufacturing processes (or machines) from amongst the alternatives, frequently encountered in different stages of realization of in...

To ensure the robustness of geometric tolerancing in collaborative design, a multi-view tolerance data representation is needed as well as a multi-level representation. The goal of multi-level representation is to detail the tolerances as the knowledge of the product progresses during its development. After a brief discussion, IPPOP product model and GeoSpelling tolerance model are chosen as ba...

Distributed programs are hard to get right because they are required to be open, scalable, long-running, and tolerant to faults. In particular, the recent approaches to distributed software based on (micro)services where different services are developed independently by disparate teams exacerbate the problem. In fact, services are meant to be composed together and run in open context where unpr...

We argue that in distributed mechanism design frameworks it is important to consider not only rational manipulation by players, but also malicious, faulty behavior. To this end, we show that in some instances it is possible to take a centralized mechanism and implement it in a distributed setting in a fault tolerant manner. More specifically, we examine two distinct models of distributed mechan...

We present a new scalable fault-tolerant algorithm which ensures total order delivery of messages sent to multiple groups of processes. Our algorithm is particularly well suited for large scale systems because: (1) any process can multicast a message to one or more groups of processes without being forced to join those groups; (2) inter-group total order is ensured system-wide but, for each ind...

Previous work on radiation hardening has focused on designing memory elements to tolerate direct hits by high energy particles. The study of latch designs to tolerate high energy particle induced transient pulses arising in the combinational part of the circuit and traveling to the inputs of DFFs has been ignored. In this work, we look at ways to slow down the input stage of latches by insertin...

In this article we describe the fault-tolerance architecture of the PerDiS platform. This architecture results from the work that was done in the rst six months at INESC with strong interaction with the other partners of the project (mainly INRIA-SOR and INRIA-SIRAC). We describe the overall fault-tolerance architecture and its integration within PerDiS, the interfaces and implementation provid...