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  • On the complexity of constructing a minmax regret solution for the two-machine flow shop problem under the interval uncertainty
    J. Sched. (IF 1.765) Pub Date : 2020-09-23
    Yakov Shafransky, Viktor Shinkarevich

    We prove the NP-hardness of constructing a minmax regret solution for the two-machine flow shop problem under the interval uncertainty of the job processing times. The problem complexity status has been an open question for over the past 20 years. We establish the NP-hardness of this problem using a so-called alternative scheme for proving the NP-hardness of optimization problems. Also, we show that

    更新日期:2020-09-23
  • Scheduling a proportionate flow shop of batching machines
    J. Sched. (IF 1.765) Pub Date : 2020-09-17
    Christoph Hertrich, Christian Weiß, Heiner Ackermann, Sandy Heydrich, Sven O. Krumke

    In this paper we study a proportionate flow shop of batching machines with release dates and a fixed number \(m \ge 2\) of machines. The scheduling problem has so far barely received any attention in the literature, but recently its importance has increased significantly, due to applications in the industrial scaling of modern bio-medicine production processes. We show that for any fixed number of

    更新日期:2020-09-18
  • Disruptions in timetables: a case study at Universidade de Lisboa
    J. Sched. (IF 1.765) Pub Date : 2020-09-14
    Alexandre Lemos, Pedro T. Monteiro, Inês Lynce

    Solving university course timetabling problems is a large and complex task. Moreover, every new academic term, a new timetable is likely to be scheduled due to disruptions (e.g., changes in teacher-lecture allocation). Nevertheless, the university infrastructure, the overall curricular plans, and the number of students/teachers is still very similar in consecutive terms. For this reason, a timetable

    更新日期:2020-09-14
  • Scheduling jobs with a V-shaped time-dependent processing time
    J. Sched. (IF 1.765) Pub Date : 2020-09-08
    Helmut A. Sedding

    In the field of time-dependent scheduling, a job’s processing time is specified by a function of its start time. While monotonic processing time functions are well-known in the literature, this paper introduces non-monotonic functions with a convex, piecewise-linear V-shape similar to the absolute value function. They are minimum at an ideal start time, which is the same for all given jobs. Then, the

    更新日期:2020-09-08
  • Multiple dispatching rules allocation in real time using data mining, genetic algorithms, and simulation
    J. Sched. (IF 1.765) Pub Date : 2020-08-19
    Mohamed Habib Zahmani, Baghdad Atmani

    In production planning and scheduling, data mining methods can be applied to transform the scheduling data into useful knowledge that can be used to improve planning/scheduling by enabling real-time decision-making. In this paper, a novel approach combining dispatching rules, a genetic algorithm, data mining, and simulation is proposed. The genetic algorithm (i) is used to solve scheduling problems

    更新日期:2020-08-20
  • New results for an open time-dependent scheduling problem
    J. Sched. (IF 1.765) Pub Date : 2020-07-13
    Stanisław Gawiejnowicz, Wiesław Kurc

    We present several new results for a single machine time-dependent scheduling problem of minimizing the total completion time of a set of linearly deteriorating jobs with unit basic processing times. First, we show new properties of cyclic transformations of V-shaped sequences for this problem. Next, applying the results, we prove a new necessary condition of schedule optimality for the considered

    更新日期:2020-07-14
  • Stochastic programming approach for unidirectional quay crane scheduling problem with uncertainty
    J. Sched. (IF 1.765) Pub Date : 2020-07-07
    Shoufeng Ma, Hongming Li, Ning Zhu, Chenyi Fu

    Quay crane scheduling is a key aspect of container terminal operation, which can be regarded as a decision-making process with uncertainty. Each task involves stochastic loading and unloading operation times owing to the existence of uncertainty. In this study, we investigate the unidirectional quay crane scheduling problem for a stochastic processing time, which requires that all the quay cranes move

    更新日期:2020-07-08
  • Dynamic speed scaling minimizing expected energy consumption for real-time tasks
    J. Sched. (IF 1.765) Pub Date : 2020-07-02
    Bruno Gaujal, Alain Girault, Stephan Plassart

    This paper proposes a discrete time Markov decision process approach to compute the optimal on-line speed scaling policy to minimize the energy consumption of a single processor executing a finite or infinite set of jobs with real-time constraints. We provide several qualitative properties of the optimal policy: monotonicity with respect to the jobs parameters, comparison with on-line deterministic

    更新日期:2020-07-02
  • A decomposition heuristic for rotational workforce scheduling
    J. Sched. (IF 1.765) Pub Date : 2020-06-30
    Tristan Becker

    In rotational workforce planning, a schedule is constructed from a sequence of work and rest periods. Each employee starts at a different part of the schedule, and after a certain amount of time, the schedule repeats. The length of the schedule increases with a higher number of employees. At the same time, various constraints on work sequences and days off have to be considered. For a large number

    更新日期:2020-06-30
  • A periodic optimization approach to dynamic pickup and delivery problems with time windows
    J. Sched. (IF 1.765) Pub Date : 2020-06-23
    Farzaneh Karami, Wim Vancroonenburg, Greet Vanden Berghe

    In dynamic pickup and delivery problems with time windows (PDPTWs), potentially urgent request information is released over time. This gradual data availability means the decision-making process must be continuously repeated. These decisions are therefore likely to deteriorate in quality as new information becomes available. It is still believed that the state of the art for this problem remains far

    更新日期:2020-06-23
  • Scheduling two projects with controllable processing times in a single-machine environment
    J. Sched. (IF 1.765) Pub Date : 2020-06-15
    Byung-Cheon Choi, Myoung-Ju Park

    We consider two single-machine scheduling problems in which two competing projects share one common resource. Each project has multiple interim assessments, and its own jobs are ordered completely. A tardy job incurs a tardiness penalty cost which can be avoided by compressing some jobs, which requires an additional cost. The performance measure of each project is the total tardiness penalty cost plus

    更新日期:2020-06-15
  • Near-linear-time approximation algorithms for scheduling a batch-processing machine with setups and job rejection
    J. Sched. (IF 1.765) Pub Date : 2020-06-11
    Jinwen Ou

    In this paper we study a single batch-processing machine scheduling model. In our model, a set of jobs having different release dates needs to be scheduled onto a single machine that can process a batch of jobs simultaneously at a time. Each batch incurs a fixed setup time and a fixed setup cost. The decision maker may reject some of the jobs by paying penalty cost so as to achieve a tight makespan

    更新日期:2020-06-11
  • An integrated rolling horizon approach to increase operating theatre efficiency
    J. Sched. (IF 1.765) Pub Date : 2020-05-23
    Belinda Spratt, Erhan Kozan

    Demand for healthcare is increasing rapidly. To meet demand, we must improve the efficiency of our public health services. We present a mixed integer programming formulation that simultaneously tackles the integrated master surgical schedule and surgical case assignment problems under a modified block scheduling policy. That is, we allocate specialties, surgeons, and patients to surgical time blocks

    更新日期:2020-05-23
  • Serial-batching scheduling with two agents to minimize makespan and maximum cost
    J. Sched. (IF 1.765) Pub Date : 2020-05-22
    Cheng He, Chunqi Xu, Hao Lin

    This paper considers three serial-batching scheduling problems with two agents to minimize the makespan of agent A and maximum cost (or maximum lateness) of agent B simultaneously. In these two-agent scheduling problems, jobs of different agents cannot be processed in a common batch, and the cost function of an agent depends only on its jobs. For each problem, we present a polynomial-time algorithm

    更新日期:2020-05-22
  • An approach to reduce energy consumption and performance losses on heterogeneous servers using power capping
    J. Sched. (IF 1.765) Pub Date : 2020-05-20
    Tomasz Ciesielczyk, Alberto Cabrera, Ariel Oleksiak, Wojciech Piątek, Grzegorz Waligóra, Francisco Almeida, Vicente Blanco

    Rapid growth of demand for remote computational power, along with high energy costs and infrastructure limits, has led to treating power usage as a primary constraint in data centers. Especially, recent challenges related to development of exascale systems or autonomous edge systems require tools that will limit power usage and energy consumption. This paper presents a power capping method that allows

    更新日期:2020-05-20
  • Approximation algorithms for energy-efficient scheduling of parallel jobs
    J. Sched. (IF 1.765) Pub Date : 2020-04-21
    Alexander Kononov, Yulia Kovalenko

    In this paper, we consider the homogeneous scheduling on speed-scalable processors, where the energy consumption is minimized. While most previous works have studied single-processor jobs, we focus on rigid parallel jobs, using more than one processor at the same time. Each job is specified by release date, deadline, processing volume and the number of required processors. Firstly, we develop constant-factor

    更新日期:2020-04-21
  • The extended roster quality staffing problem: addressing roster quality variation within a staffing planning period
    J. Sched. (IF 1.765) Pub Date : 2020-04-13
    Komarudin; Tim De Feyter; Marie-Anne Guerry; Greet Vanden Berghe

    Staffing and rostering are two interdependent optimization problems related to personnel planning. Where staffing concerns an organization’s personnel composition, personnel rostering aims to assign that staff to shifts while respecting a set of constraints. Staffing decisions therefore impact on the extent to which personnel rostering objectives can be accomplished. Previous research has suggested

    更新日期:2020-04-13
  • Resource-constrained multi-project scheduling: benchmark datasets and decoupled scheduling
    J. Sched. (IF 1.765) Pub Date : 2020-04-10
    Rob Van Eynde; Mario Vanhoucke

    In this paper, we propose a new dataset for the resource-constrained multi-project scheduling problem and evaluate the performance of multi-project extensions of the single-project schedule generation schemes. This manuscript contributes to the existing research in three ways. First, we provide an overview of existing benchmark datasets and classify the multi-project literature based on the type of

    更新日期:2020-04-10
  • Single machine scheduling to maximize the number of on-time jobs with generalized due-dates
    J. Sched. (IF 1.765) Pub Date : 2020-03-06
    Enrique Gerstl; Gur Mosheiov

    In scheduling problems with generalized due dates (gdd), the due dates are specified according to their position in the sequence, and the j-th due date is assigned to the job in the j-th position. We study a single-machine problem with generalized due dates, where the objective is maximizing the number of jobs completed exactly on time. We prove that the problem is NP-hard in the strong sense. To our

    更新日期:2020-03-06
  • Benders decomposition for the mixed no-idle permutation flowshop scheduling problem
    J. Sched. (IF 1.765) Pub Date : 2020-02-26
    Tolga Bektaş; Alper Hamzadayı; Rubén Ruiz

    The mixed no-idle flowshop scheduling problem arises in modern industries including integrated circuits, ceramic frit and steel production, among others, and where some machines are not allowed to remain idle between jobs. This paper describes an exact algorithm that uses Benders decomposition with a simple yet effective enhancement mechanism that entails the generation of additional cuts by using

    更新日期:2020-02-26
  • A polyhedral study of event-based models for the resource-constrained project scheduling problem
    J. Sched. (IF 1.765) Pub Date : 2020-02-24
    Alexander Tesch

    In this paper, we study event-based mixed-integer programming (MIP) formulations for the resource-constrained project scheduling problem (RCPSP) that represent an alternative to the more common time-indexed model (DDT) (Pritsker et al. in Manag Sci 16(1):93–108, 1969; Christofides et al. in Eur J Oper Res 29(3):262–273, 1987) for the case when the scheduling horizon is large. In contrast to time-indexed

    更新日期:2020-02-24
  • Single-machine scheduling with multi-agents to minimize total weighted late work
    J. Sched. (IF 1.765) Pub Date : 2020-02-21
    Shi-Sheng Li; Jin-Jiang Yuan

    We consider the competitive multi-agent scheduling problem on a single machine, where each agent’s cost function is to minimize its total weighted late work. The aim is to find the Pareto-optimal frontier, i.e., the set of all Pareto-optimal points. When the number of agents is arbitrary, the decision problem is shown to be unary \(\mathcal {NP}\)-complete even if all jobs have the unit weights. When

    更新日期:2020-02-21
  • Cyclic lot-sizing problems with sequencing costs
    J. Sched. (IF 1.765) Pub Date : 2020-02-21
    Alexander Grigoriev, Vincent J. Kreuzen, Tim Oosterwijk

    We study a single-machine lot-sizing problem, where n types of products need to be scheduled on the machine. Each product is associated with a constant demand rate, maximum production rate and inventory costs per time unit. Every time when the machine switches production between products, sequencing costs are incurred. These sequencing costs depend both on the product the machine just produced and

    更新日期:2020-02-21
  • Scheduling in data gathering networks with background communications
    J. Sched. (IF 1.765) Pub Date : 2020-02-20
    Joanna Berlińska

    In this work, we study scheduling in star data gathering networks with background communications. The worker nodes of the network hold datasets that have to be transferred directly to the base station. The communication speed of each link changes with time, due to other applications using the network, independently of the speeds of other links. Our goal is to gather all data within the minimum time

    更新日期:2020-02-20
  • Measuring the complexity of university timetabling instances
    J. Sched. (IF 1.765) Pub Date : 2020-02-19
    Felipe de la Rosa-Rivera, Jose I. Nunez-Varela, Cesar A. Puente-Montejano, Sandra E. Nava-Muñoz

    University timetabling is a real-world problem frequently encountered in higher education institutions. It has been studied by many researchers who have proposed a wide variety of solutions. Measuring the variation of the performance of solution approaches across instance spaces is a critical factor for algorithm selection and algorithm configuration, but because of the diverse conditions that define

    更新日期:2020-02-19
  • Interruptible algorithms for multiproblem solving
    J. Sched. (IF 1.765) Pub Date : 2020-02-15
    Spyros Angelopoulos; Alejandro López-Ortiz

    In this paper, we address the problem of designing an interruptible system in a setting which involves n problem instances. The system schedules executions of a contract algorithm (which offers a trade-off between allowable computation time and quality of the solution) in m identical parallel processors. When an interruption occurs, the system outputs the currently best solution to each of the n problem

    更新日期:2020-02-15
  • An Efficient Filtering Algorithm for the Unary Resource Constraint with Transition Times and Optional Activities
    J. Sched. (IF 1.765) Pub Date : 2020-02-15
    Sascha Van Cauwelaert; Cyrille Dejemeppe; Pierre Schaus

    This paper describes a unified global constraint to model scheduling problems with unary resources, i.e., each resource can process only a single activity at a time. In addition, the constraint enforces sequence-dependent transition times between activities. It often happens that activities are grouped into families with zero transition times within a family. Moreover, some of the activities might

    更新日期:2020-02-15
  • Broadcasting a file in a communication network
    J. Sched. (IF 1.765) Pub Date : 2020-02-11
    Kai-Simon Goetzmann; Tobias Harks; Max Klimm

    We study the problem of distributing a file, initially located at a server, among a set of n nodes. The file is divided into \(m\ge 1\) equally sized packets. After downloading a packet, nodes can upload it to other nodes, possibly to multiple nodes in parallel. Each node, however, may receive each packet from a single source node only. The upload and download rates between nodes are constrained by

    更新日期:2020-02-11
  • The flexible break assignment problem for large tour scheduling problems with an application to airport ground handlers
    J. Sched. (IF 1.765) Pub Date : 2020-02-03
    Ferdinand Kiermaier; Markus Frey; Jonathan F. Bard

    The paper examines the complexity of assigning multiple breaks to shifts in the context of large-scale tour scheduling. A mixed-integer programming (MIP) model is presented that includes shift and days-off scheduling along with break assignments for a multi-skilled workforce. To achieve tractability, a two-stage decomposition procedure is proposed that separates the tour scheduling problem (TShP) from

    更新日期:2020-02-03
  • On the exact solution of a large class of parallel machine scheduling problems
    J. Sched. (IF 1.765) Pub Date : 2020-02-03
    Teobaldo Bulhões; Ruslan Sadykov; Anand Subramanian; Eduardo Uchoa

    This work deals with a very generic class of scheduling problems with identical/uniform/unrelated parallel machine environment. It considers well-known attributes such as release dates, deadlines, or sequence-dependent setup times and accepts any objective function defined over job completion times. Non-regular objectives are also supported. We introduce a branch-cut-and-price algorithm for such problems

    更新日期:2020-02-03
  • A review of four decades of time-dependent scheduling: main results, new topics, and open problems
    J. Sched. (IF 1.765) Pub Date : 2020-01-28
    Stanisław Gawiejnowicz

    This paper is a comprehensive review of the research conducted over the past four decades in the domain of time-dependent scheduling, where variable processing times of jobs depend on when the jobs start. The paper is divided into four parts. The first part recalls some definitions and notions, introduces terminology, and defines the main models of time-dependent job processing times and the notation

    更新日期:2020-01-28
  • A diving heuristic for planning and scheduling surgical cases in the operating room department with nurse re-rostering
    J. Sched. (IF 1.765) Pub Date : 2020-01-28
    Babak Akbarzadeh; Ghasem Moslehi; Mohammad Reisi-Nafchi; Broos Maenhout

    The decisions in the operating room scheduling process related to the case mix planning, the master surgery schedule and the nurse roster are based on the expected demand, predicted by historical data. Patients are only scheduled in the operational phase when the actual demand is known. However, the actual patient demand may differ from the expected demand. In this paper, we integrate the surgical

    更新日期:2020-01-28
  • Two-stage open-shop scheduling with a two-machine flow shop as a stage: approximation algorithms and empirical experiments
    J. Sched. (IF 1.765) Pub Date : 2020-01-10
    Jianming Dong, Joshua Chang, Bing Su, Jueliang Hu, Guohui Lin

    We study a scheduling environment that finds many real-world manufacturing applications, in which there is a close connection between a hybrid multiprocessor open shop and multiple parallel identical flow shops. In this environment, there is an extended two-stage open shop, where in one stage we have a set of parallel identical machines, while in the other we have a two-machine flow shop. Our objective

    更新日期:2020-01-10
  • Approximation algorithms for the twin robot scheduling problem
    J. Sched. (IF 1.765) Pub Date : 2020-01-07
    Florian Jaehn; Andreas Wiehl

    We consider the \(\mathscr {NP}\)-hard twin robot scheduling problem, which was introduced by Erdoğan et al. (Naval Res Logist (NRL) 61(2):119–130, 2014). Here, two moving robots positioned at the opposite ends of a rail have to perform automated storage and retrieval jobs at given positions along the gantry rail with a non-crossing constraint. The objective is to minimize the makespan. We extend the

    更新日期:2020-01-07
  • Interference aware scheduling of triple-crossover-cranes
    J. Sched. (IF 1.765) Pub Date : 2019-12-18
    Dirk Briskorn; Lennart Zey

    In order to increase the productivity of sea port container storage yards, a triple-crossover-stacking-crane setting can be deployed. Although this setting yields promising results, there is increasing risk of cranes interfering. Coping with interference is a key factor for exploiting the potential of triple-crossover-stacking-cranes to increase overall productivity. In this paper, we tackle the problem

    更新日期:2019-12-18
  • An optimal online algorithm for scheduling with general machine cost functions
    J. Sched. (IF 1.765) Pub Date : 2019-12-09
    Islam Akaria; Leah Epstein

    We present two deterministic online algorithms for the problem of scheduling with a general machine cost function. In this problem, every machine has a cost that is given by a nonnegative cost function, and the objective function is the sum of makespan and the cost of the purchased machines. In previous work by Imreh, it was shown that no deterministic algorithm has competitive ratio below 2, and an

    更新日期:2019-12-09
  • Evaluating periodic rescheduling policies using a rolling horizon framework in an industrial-scale multipurpose plant
    J. Sched. (IF 1.765) Pub Date : 2019-10-25
    Zachariah Stevenson; Ricardo Fukasawa; Luis Ricardez-Sandoval

    Periodic rescheduling is a commonly used method for scheduling short-term operations. Through computational experiments that vary plant parameters, such as the load and the capacity of a facility, we investigate the effects these parameters have on plant performance under periodic rescheduling. The results show that choosing a suitable rescheduling policy depends highly on some key plant parameters

    更新日期:2019-10-25
  • A hybrid algorithm for the vehicle routing problem with three-dimensional loading constraints and mixed backhauls
    J. Sched. (IF 1.765) Pub Date : 2019-10-04
    Henriette Koch; Maximilian Schlögell; Andreas Bortfeldt

    In this paper, a variant of the vehicle routing problem with mixed backhauls (VRPMB) is presented, i.e. goods have to be delivered from a central depot to linehaul customers, and, at the same time, goods have to be picked up from backhaul customers and brought to the depot. Both types of customers can be visited in mixed sequences. The goods to be delivered or picked up are three-dimensional (cuboid)

    更新日期:2019-10-04
  • Three-stage ordered flow shops with either synchronous flow, blocking or no-idle machines
    J. Sched. (IF 1.765) Pub Date : 2019-09-21
    S. S. Panwalkar; Christos Koulamas

    We show by induction that the shortest processing time sequence is optimal for a number of three-stage ordered flow shops with either synchronous flow, blocking or no-idle machines, effectively proving the optimality of an index priority rule when the adjacent job pairwise interchange argument does not hold. We also show that when the middle machine is maximal, the synchronous flow, blocking and no-wait

    更新日期:2019-09-21
  • Single-machine scheduling with job-dependent machine deterioration
    J. Sched. (IF 1.765) Pub Date : 2019-09-19
    Wenchang Luo; Yao Xu; Weitian Tong; Guohui Lin

    We consider the single-machine scheduling problem with job-dependent machine deterioration. In the problem, we are given a single machine with an initial nonnegative maintenance level, and a set of jobs each with a non-preemptive processing time and a machine deterioration. Such a machine deterioration quantifies the decrement in the machine maintenance level after processing the job. To avoid a machine

    更新日期:2019-09-19
  • The optimal design of round-robin tournaments with three players
    J. Sched. (IF 1.765) Pub Date : 2019-09-12
    Alex Krumer; Reut Megidish; Aner Sela

    We study the optimal design of round-robin tournaments with three symmetric players. We characterize the subgame-perfect equilibrium in these tournaments with either one or two prizes. Our results show that the players who wish to maximize their expected payoffs or their probabilities of winning have different preferences about the order of games under tournaments with one or two prizes. We analyze

    更新日期:2019-09-12
  • Mixed batch scheduling on identical machines
    J. Sched. (IF 1.765) Pub Date : 2019-09-11
    Jun-Qiang Wang; Guo-Qiang Fan; Zhixin Liu

    This paper studies a new mixed batch scheduling problem that arises in vacuum heat treatment. A mixed batch machine can process at most a given number of jobs simultaneously. The processing time of a batch is the weighted sum of the maximum processing time and the total processing time of jobs in the batch. The objective is to minimize the makespan. We first prove that the problem on a single machine

    更新日期:2019-09-11
  • Maximizing the number of jobs scheduled at their baseline starting times in case of machine failures
    J. Sched. (IF 1.765) Pub Date : 2019-09-09
    Philippe Chrétienne

    We investigate the problem of keeping the maximum number of starting times of a baseline schedule if some machines happen to be out of order when the baseline schedule is to be implemented. If the machines are identical, we show that the problem is polynomially solved when no deadline is imposed on the reactive schedule and is strongly NP-hard otherwise. If the number of unrelated machines is fixed

    更新日期:2019-09-09
  • Branch-cut-and-price for scheduling deliveries with time windows in a direct shipping network
    J. Sched. (IF 1.765) Pub Date : 2019-09-06
    Timo Gschwind; Stefan Irnich; Christian Tilk; Simon Emde

    In a direct shipping (or point-to-point) network, individual deliveries are round trips from one supplier to one customer and back to either the same or another supplier, i.e., a truck can visit only one customer at a time before it has to return to a supplier. We consider the multiple sources/multiple sinks case, where a given set of direct deliveries from a set of suppliers to a set of customers

    更新日期:2019-09-06
  • On the parameterized tractability of the just-in-time flow-shop scheduling problem
    J. Sched. (IF 1.765) Pub Date : 2019-08-14
    Danny Hermelin; Dvir Shabtay; Nimrod Talmon

    We study the parameterized complexity of a set of flow-shop scheduling problems in which the objective is to maximize the weighted number of just-in-time jobs. Our analysis focuses on the case where the number of due dates is considerably smaller than the number of jobs and thus can be considered as a parameter. We prove that the two-machine problem is W[1]-hard with respect to this parameter, even

    更新日期:2019-08-14
  • A decomposition-based approach to the scheduling of identical automated yard cranes at container terminals
    J. Sched. (IF 1.765) Pub Date : 2019-07-31
    Amelie Eilken

    In today’s ports, the storage area is often the bottleneck in the serving of a vessel. It is therefore an important influencing factor in the minimization of the turnaround time of the vessels, which is the main objective in operational planning in container terminals. The operational planning of the yard cranes strongly impacts the yard’s efficiency. This planning task comprises the assignment of

    更新日期:2019-07-31
  • Unary NP-hardness of single-machine scheduling to minimize the total tardiness with deadlines
    J. Sched. (IF 1.765) Pub Date : 2019-07-24
    Rubing Chen; Jinjiang Yuan

    We revisit the classical single-machine scheduling problem to minimize total tardiness with deadlines. The problem is binary NP-hard even without the deadline restrictions. It was reported early in Koulamas and Kyparisis (Eur J Oper Res 133:447–453, 2001) that the exact complexity (unary NP-hardness or pseudo-polynomial-time solvability) of the problem is still open. We show that this problem is unary

    更新日期:2019-07-24
  • Optimizing the physician scheduling problem in a large hospital ward
    J. Sched. (IF 1.765) Pub Date : 2019-07-17
    Renata Mansini; Roberto Zanotti

    In recent years, large public hospitals have undergone a strong growth in healthcare services demand, not offset by resources increase. In this context, one of the most critical issues is the optimization of human resources. In this paper, we study the problem of finding the optimal assignment of tasks to physicians over a predefined time horizon in a large general surgery ward. Each task has to be

    更新日期:2019-07-17
  • Two-agent scheduling with deteriorating jobs on a single parallel-batching machine: refining computational complexity
    J. Sched. (IF 1.765) Pub Date : 2019-07-11
    Mikhail Y. Kovalyov; Dmitrij Šešok

    Tang et al. (Eur J Oper Res 263:401–411, 2017) have recently introduced a parallel-batching machine scheduling problem with linearly deteriorating jobs of two agents and presented a computational complexity classification of various special cases of this problem, including a number of NP-hardness proofs. We refine these results by demonstrating strong NP-hardness of several special cases, which are

    更新日期:2019-07-11
  • Metaheuristics for solving a multi-objective flow shop scheduling problem with sequence-dependent setup times
    J. Sched. (IF 1.765) Pub Date : 2019-06-14
    V. Anjana; R. Sridharan; P. N. Ram Kumar

    Industries such as textiles, paints, chemicals, paper, drugs and pharmaceuticals operate as flow shops with sequence-dependent setup times (SDST). The sequence-dependent setup environment is characterised by the dependence of the setup time on the current job and also on the previous job processed on that machine. To further complicate the problem, in most real-life scenarios, decision-makers have

    更新日期:2019-06-14
  • Two-machine flow shops with an optimal permutation schedule under a storage constraint
    J. Sched. (IF 1.765) Pub Date : 2019-04-22
    Yunhong Min; Byung-Cheon Choi; Myoung-Ju Park

    We consider two-machine flow shop scheduling problems with storage to minimize the makespan. Under a storage constraint, each job has its own size, and the total size of the job(s) being processed on the machine(s) and the job(s) waiting for the second operation cannot exceed the given capacity. It is known that the computational complexity is strongly NP-hard and in general an optimal schedule does

    更新日期:2019-04-22
  • Shop scheduling problems with pliable jobs
    J. Sched. (IF 1.765) Pub Date : 2019-04-02
    S. Knust; N. V. Shakhlevich; S. Waldherr; C. Weiß

    In this paper, we study a new type of flow shop and open shop models, which handle so-called “pliable” jobs: their total processing times are given, but individual processing times of operations which make up these jobs are flexible and need to be determined. Our analysis demonstrates that many versions of flow shop and open shop problems with pliable jobs appear to be computationally easier than their

    更新日期:2019-04-02
  • A unified view of parallel machine scheduling with interdependent processing rates
    J. Sched. (IF 1.765) Pub Date : 2019-03-25
    Bahram Alidaee; Haibo Wang; R. Bryan Kethley; Frank Landram

    In this paper, we are concerned with the problem of scheduling n jobs on m machines. The job processing rate is interdependent and the jobs are non-preemptive. During the last several decades, a number of related models for parallel machine scheduling with interdependent processing rates (PMS-IPR) have appeared in the scheduling literature. Some of these models have been studied independently from

    更新日期:2019-03-25
  • Sequencing assembly lines to facilitate synchronized just-in-time part supply
    J. Sched. (IF 1.765) Pub Date : 2019-03-23
    Simon Emde; Lukas Polten

    The problem of sequencing assembly lines consists of determining the order in which a given set of products is launched down the line. Since individual products may require different parts in different quantities, the production sequence has a big influence on line-side inventory. Classically, sequences are often optimized with the goal of attaining level schedules, i.e., the part demand should be

    更新日期:2019-03-23
  • Risk-averse single machine scheduling: complexity and approximation
    J. Sched. (IF 1.765) Pub Date : 2019-02-28
    Adam Kasperski; Paweł Zieliński

    In this paper, a class of single machine scheduling problems is considered. It is assumed that job processing times and due dates can be uncertain and they are specified in the form of discrete scenario set. A probability distribution in the scenario set is known. In order to choose a schedule, some risk criteria such as the value at risk and conditional value at risk are used. Various positive and

    更新日期:2019-02-28
  • Minimizing the waiting time for a one-way shuttle service
    J. Sched. (IF 1.765) Pub Date : 2019-02-13
    Laurent Daudet; Frédéric Meunier

    Consider a terminal in which users arrive continuously over a finite period of time at a variable rate known in advance. A fleet of shuttles has to carry them over a fixed trip. What is the shuttle schedule that minimizes their waiting time? This is the question addressed in the present paper. We consider several versions that differ according to whether the shuttles come back to the terminal after

    更新日期:2019-02-13
  • Minimizing total weighted completion time on a single machine subject to non-renewable resource constraints
    J. Sched. (IF 1.765) Pub Date : 2019-02-06
    Péter Györgyi; Tamás Kis

    In this paper, we describe new complexity results and approximation algorithms for single-machine scheduling problems with non-renewable resource constraints and the total weighted completion time objective. This problem is hardly studied in the literature. Beyond some complexity results, only a fully polynomial-time approximation scheme (FPTAS) is known for a special case. In this paper, we discuss

    更新日期:2019-02-06
  • A complexity analysis of parallel scheduling unit-time jobs with in-tree precedence constraints while minimizing the mean flow time
    J. Sched. (IF 1.765) Pub Date : 2019-02-02
    Tianyu Wang; Odile Bellenguez-Morineau

    This paper deals with a particular scheduling problem. We consider unit-time jobs and in-tree precedence constraints while minimizing the mean flow time. This problem is observed as \(P|p_{j}=1,\text {in-tree}|\sum C_{j}\) with the use of the 3-filed notation. To the best of our knowledge, its complexity is still open. Through a reduction from 3-Partition, we show that this problem is strongly \( \mathcal

    更新日期:2019-02-02
  • Single machine scheduling with stochastically dependent times
    J. Sched. (IF 1.765) Pub Date : 2019-01-30
    Wei Wei

    This paper examines the behavior of several single machine scheduling problems when presented with times that are random and potentially dependent. A position-based learning effect model is revisited and optimal schedules are derived under several typical performance measures. A sum-of-processing-time based model is proposed to incorporate the learning effects and deteriorations in one unified framework

    更新日期:2019-01-30
  • The Complexity of Parallel Machine Scheduling of Unit-Processing-Time Jobs under Level-Order Precedence Constraints
    J. Sched. (IF 1.765) Pub Date : 2019-01-02
    Tianyu Wang; Odile Bellenguez-Morineau

    In this paper, we prove that parallel machine scheduling problems where jobs have unit processing time and level-order precedence constraints are NP-complete, while minimizing the makespan or the total completion time. These problems are NP-complete even when preemption is allowed. We then adapt the proof to other open problems with out-tree or opposing-forests precedence constraints.

    更新日期:2019-01-02
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