In this paper, we consider discrete event systems divided in a main system and a secondary system such that the inner dynamics of each system is ruled by standard synchronizations and the interactions between both systems are expressed by partial synchronizations (i.e., event e2 can only occur when, not after, event e1 occurs) of events in the secondary system by events in the main system. The ...

This paper proposes a new approach to the well known LiuLayland periodic scheduling problem. This approach proves that any justin-time sequence with maximum absolute deviation being less than one is in fact a periodic schedule. Consequently, periodic schedules can be obtained by any algorithm capable of generating just-in-time sequences with maximum absolute deviation being less than one, for i...

Postcompletion error (Byrne & Bovair, 1997) is a robust form of routine procedural error that can be difficult to prevent. However, Chung and Byrne (2004, 2008) reported the complete elimination of this error with a highly aggressive cue, one which was just-in-time, highly specific, and highly visually salient. This paper reports three experiments designed to investigate the role of each one of...

Time-based supply chain management is already realized to a certain extent – especially on a regional or national level. But in an international context the time focus is only visible in particular supply chain segments as for example the just-in-time delivery. Other areas of the global supply chain are only allowing a continuous parts flow with the help of stocks. For reducing these stock leve...

Because of the dynamic nature of the interstellar medium, the Sun should have encountered a variety of different interstellar environments in its lifetime. As the solar wind interacts with the surrounding interstellar medium to form a heliosphere, different helio-sphere shapes, sizes, and particle contents result from the different environments. Some of the large possible interstellar parameter...

Consider the Product Rate Variation problem. Given n products 1, ..., i, ..., n, and n positive integer demands d1, ..., di, ..., dn. Find a sequence α = α1, ..., αT , T = ∑n i=1 di, of the products, where product i occurs exactly di times that always keeps the actual production level, equal the number of product i occurrences in the prefix α1, ..., αt, t = 1, ..., T , and the desired productio...

ii DEDICATION To M. and D., for making me who I am today. iii If people did not sometimes do silly things, nothing intelligent would ever get done. There's no ulterior practical purpose here. I'm just playing. That's what math is – wondering, playing, amusing yourself with your imagination.

Just‐In‐Time (JIT) production has received a great deal of attention, worldwide, since its introduction in Japan a few decades ago. It has been well documented that some of the main benefits of JIT implementation are reduction of inventories, lead‐time reduction, and cost savings. Most of the previous research on the impact of JIT on firm performance has either been anecdotal (one‐firm studies)...