Better Approximation Guarantees for Job-Shop Scheduling
نویسندگان
چکیده
منابع مشابه
Better approximation guarantees for job - shop scheduiing
Job-shop scheduling is a classical NP-hard problem. Shmoys, Stein & Wein presented the first polynomial-time approximation algorithm for this problem that has a good (polylogarithmic) approximation guarantee. We improve the approximation guarantee of their work, and preseut further improvements for some important NP-hard special cases of this problem (e.g.' in the preempliue case where machines...
متن کاملConstraint-Based Optimization and Approximation for Job-Shop Scheduling
We present constraint-based optimization algorithms and a constraintbased approximation algorithm for the job-shop scheduling problem. An empirical performance analysis shows that both the optimization algorithms and the approximation algorithm perform well. Especially the approximation algorithm is among the best algorithms known to date. We, furthermore, show that we can improve the performan...
متن کاملJob-shop scheduling
The n×m minimum-makespan general job-shop scheduling problem, hereafter referred to as the JSSP, can be described by a set of n jobs {Ji}1≤j≤n which is to be processed on a set of m machines {Mr}1≤r≤m. Each job has a technological sequence of machines to be processed. The processing of job Jj on machine Mr is called the operation Ojr. Operation Ojr requires the exclusive use of Mr for an uninte...
متن کاملHybrid job shop scheduling
We consider the problem of scheduling jobs in a hybrid job shop We use the term hybrid to indicate that we consider a lot of extensions of the classic job shop such as transportation times multiple resources and setup times The Shifting Bottleneck procedure can be generalized to deal with those extensions We test this approach for an assembly shop In this shop we study the in uence of static an...
متن کاملJob-shop scheduling in a body shop
We study a generalized job-shop problem called the body shop scheduling problem (BSSP). This problem arises from the industrial application of welding in a car body production line, where possible collisions between industrial robots have to be taken into account. BSSP corresponds to a job-shop problem where the operations of a job have to follow alternating routes on the machines, certain oper...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: SIAM Journal on Discrete Mathematics
سال: 2001
ISSN: 0895-4801,1095-7146
DOI: 10.1137/s0895480199326104