hot rolling of a large ring of titanium alloy (lrt) is a highly nonlinear incremental forming process with coupled mechanical and thermal behaviors (mtbs) which significantly affect microstructure and properties of the ring. the feed rate of idle roll and the rotational speed of driver roll have major effects on ovality of the ring. in this paper, the effects of these parameters on the ovality ...

in some industries as foundries, it is not technically feasible to interrupt a processor between jobs. this restriction gives rise to a scheduling problem called no-idle scheduling. this paper deals with scheduling of no-idle open shops to minimize maximum completion time of jobs, called makespan. the problem is first mathematically formulated by three different mixed integer linear programming...

This work analyzes replacing an insert made of ceramic with CBN (Cubic Boron Nitride). The inserts are cutting tools used in machining. We will start by presenting a brief account what machining is, is applicable this research and the properties two tools. also include our objective justification for carrying out project. Next, we describe all equipment process to verify results, detailing func...

Although both media commentary and academic research have focused much attention on the dilemma of employees being too busy, this paper presents evidence of the opposite phenomenon, in which employees do not have enough work to fill their time and are left with hours of meaningless idle time each week. We conducted six studies that examine the prevalence and work pacing consequences of involunt...

The decreasing cost of personal workstations over recent years has led to their proliferation in computing environments. Studies have shown that personal workstations are under-utilized for long periods of time during regular working hours. This paper identiies this under-utilization as the idle-workstation problem. A taxonomy of computational models of systems that have attempted to solve the ...

The max / / C idle no F − problem is solved by a branch and bound algorithm, or a mixed integer programming solver. This problem is known to be NP-hard. The noidle flow-shop configuration, where machines work continuously without idle intervals is an interesting manufacturing environment in many industries. The idle characteristic is a very strong constraint and it affects seriously the value o...

Even a fully loaded computer system, where the bottleneck resource is constantly busy, often has some idle capacities available on other resources. This proposal argues for using these idle capacities speculatively, increasing system performance for correct predictions. In such a system, all resources will ideally be constantly loaded with either regular foreground tasks, or speculative idle-ti...

Inserted idle time occurs when a machine is kept waiting deliberately for the arrival of a job that is still being processed on a preceding machine. A common assumption in most of the existing literature on flowshop scheduling is that inserted idle time is not allowed, and whenever there are jobs that are ready for processing on a given machine, that machine is not kept idle for any reason. Thi...

Nowadays, natural gas conforms to the conditions of environmental protection and renewable energy, which plays a significant role in the future development of mankind. It has made some progress in applying natural gas to the automotive industry. As we all know that the source power of automobile comes from engine, therefore, based on the study on the control algorithm of gas engine, this paper ...