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  Subjects -> PHYSICS (Total: 798 journals)
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PHYSICS (581 journals)            First | 1 2 3 | Last

Showing 201 - 400 of 741 Journals sorted alphabetically
International Journal of Materials and Product Technology     Hybrid Journal   (Followers: 4)
International Journal of Mechanical Sciences     Hybrid Journal   (Followers: 11)
International Journal of Mechanics and Materials in Design     Hybrid Journal   (Followers: 5)
International Journal of Medical Physics, Clinical Engineering and Radiation Oncology     Open Access   (Followers: 5)
International Journal of Micro-Nano Scale Transport     Full-text available via subscription   (Followers: 2)
International Journal of Microstructure and Materials Properties     Hybrid Journal   (Followers: 8)
International Journal of Microwave Science and Technology     Open Access   (Followers: 4)
International Journal of Modeling, Simulation, and Scientific Computing     Hybrid Journal   (Followers: 1)
International Journal of Modern Physics A     Hybrid Journal   (Followers: 15)
International Journal of Modern Physics B     Hybrid Journal   (Followers: 11)
International Journal of Modern Physics C     Hybrid Journal   (Followers: 14)
International Journal of Modern Physics D     Hybrid Journal   (Followers: 12)
International Journal of Modern Physics E     Hybrid Journal   (Followers: 14)
International Journal of Nanomanufacturing     Hybrid Journal  
International Journal of Nanoscience     Hybrid Journal   (Followers: 2)
International Journal of Nanotechnology     Hybrid Journal   (Followers: 6)
International Journal of Non-Linear Mechanics     Hybrid Journal   (Followers: 6)
International Journal of Physical Sciences     Open Access  
International Journal of Physics     Open Access   (Followers: 11)
International Journal of PIXE     Hybrid Journal   (Followers: 1)
International Journal of Plasticity     Hybrid Journal   (Followers: 6)
International Journal of Quantum Information     Hybrid Journal   (Followers: 2)
International Journal of Self-Propagating High-Temperature Synthesis     Hybrid Journal   (Followers: 2)
International Journal of Solids and Structures     Hybrid Journal   (Followers: 14)
International Journal of Surface Science and Engineering     Hybrid Journal   (Followers: 7)
International Journal of Theoretical and Applied Multiscale Mechanics     Hybrid Journal   (Followers: 2)
International Journal of Theoretical and Mathematical Physics     Open Access   (Followers: 12)
International Journal of Theoretical Physics     Hybrid Journal   (Followers: 17)
International Journal of Thermal Sciences     Hybrid Journal   (Followers: 13)
International Letters of Chemistry, Physics and Astronomy     Open Access   (Followers: 8)
International Materials Reviews     Hybrid Journal   (Followers: 12)
Inverse Problems     Hybrid Journal   (Followers: 2)
IOP Conference Series: Materials Science and Engineering     Open Access   (Followers: 6)
Iranian Journal of Medical Physics     Open Access  
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 5)
Izvestiya Atmospheric and Oceanic Physics     Hybrid Journal   (Followers: 3)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 2)
Japanese Journal of Applied Physics     Full-text available via subscription   (Followers: 3)
JCP : BioChemical Physics     Hybrid Journal   (Followers: 1)
JETP Letters     Hybrid Journal   (Followers: 5)
Journal of Adhesion Science and Technology     Hybrid Journal   (Followers: 8)
Journal of Advanced Physics     Full-text available via subscription   (Followers: 15)
Journal of Applied Mathematics and Mechanics     Full-text available via subscription   (Followers: 5)
Journal of Applied Mathematics and Physics     Open Access   (Followers: 8)
Journal of Applied Mechanics and Technical Physics     Hybrid Journal   (Followers: 6)
Journal of Applied Physics     Hybrid Journal   (Followers: 77)
Journal of Applied Remote Sensing     Hybrid Journal   (Followers: 53)
Journal of Applied Spectroscopy     Hybrid Journal   (Followers: 9)
Journal of Astrophysics     Open Access   (Followers: 29)
Journal of Astrophysics and Astronomy     Open Access   (Followers: 43)
Journal of Basic and Applied Physics     Open Access   (Followers: 3)
Journal of Building Physics     Hybrid Journal   (Followers: 1)
Journal of Chromatographic Science     Hybrid Journal   (Followers: 18)
Journal of Complex Networks     Hybrid Journal   (Followers: 1)
Journal of Composite Materials     Hybrid Journal   (Followers: 251)
Journal of Computational Physics     Hybrid Journal   (Followers: 64)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 11)
Journal of Dynamic Systems, Measurement, and Control     Full-text available via subscription   (Followers: 13)
Journal of Elasticity     Hybrid Journal   (Followers: 5)
Journal of Electrical Bioimpedance     Full-text available via subscription   (Followers: 2)
Journal of Electron Spectroscopy and Related Phenomena     Hybrid Journal   (Followers: 3)
Journal of Electronic Materials     Hybrid Journal   (Followers: 3)
Journal of Electronics Cooling and Thermal Control     Open Access   (Followers: 4)
Journal of Engineering Materials and Technology     Full-text available via subscription   (Followers: 15)
Journal of Engineering Physics and Thermophysics     Hybrid Journal   (Followers: 1)
Journal of Experimental and Theoretical Physics     Hybrid Journal   (Followers: 3)
Journal of Fire Sciences     Hybrid Journal   (Followers: 4)
Journal of Geometry and Physics     Full-text available via subscription  
Journal of Geophysical Research : Space Physics     Full-text available via subscription   (Followers: 112)
Journal of Gravity     Open Access   (Followers: 2)
Journal of High Energy Astrophysics     Full-text available via subscription   (Followers: 26)
Journal of High Energy Physics     Hybrid Journal   (Followers: 19)
Journal of Hydrogels     Full-text available via subscription  
Journal of Hyperspectral Remote Sensing     Open Access   (Followers: 16)
Journal of Imaging     Open Access   (Followers: 2)
Journal of Information Display     Hybrid Journal  
Journal of Intelligent Material Systems and Structures     Hybrid Journal   (Followers: 4)
Journal of Lightwave Technology     Hybrid Journal   (Followers: 8)
Journal of Low Frequency Noise, Vibration and Active Control     Full-text available via subscription   (Followers: 6)
Journal of Luminescence     Hybrid Journal   (Followers: 2)
Journal of Materials Engineering and Performance     Hybrid Journal   (Followers: 22)
Journal of Materials Physics and Chemistry     Open Access   (Followers: 1)
Journal of Materials Science     Hybrid Journal   (Followers: 19)
Journal of Materials Science : Materials in Electronics     Hybrid Journal   (Followers: 3)
Journal of Materials Science : Materials in Medicine     Hybrid Journal   (Followers: 5)
Journal of Mathematical Fluid Mechanics     Hybrid Journal   (Followers: 6)
Journal of Mathematical Physics     Hybrid Journal   (Followers: 24)
Journal of Medical Imaging and Health Informatics     Full-text available via subscription  
Journal of Medical Ultrasonics     Hybrid Journal   (Followers: 2)
Journal of Micro/Nanolithography MEMS and MOEMS     Hybrid Journal   (Followers: 10)
Journal of Modern Physics     Open Access   (Followers: 7)
Journal of Molecular Spectroscopy     Hybrid Journal   (Followers: 8)
Journal of Motor Behavior     Hybrid Journal   (Followers: 10)
Journal of Multiscale Modeling     Hybrid Journal  
Journal of Nanophotonics     Hybrid Journal   (Followers: 4)
Journal of Nepal Physical Society     Open Access  
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 9)
Journal of Nonlinear Dynamics     Open Access   (Followers: 1)
Journal of Nonlinear Mathematical Physics     Hybrid Journal   (Followers: 1)
Journal of Nuclear Physics, Material Sciences, Radiation and Applications     Open Access   (Followers: 1)
Journal of Optics     Hybrid Journal   (Followers: 8)
Journal of Physical and Chemical Reference Data     Hybrid Journal   (Followers: 4)
Journal of Physical Chemistry B     Full-text available via subscription   (Followers: 37)
Journal of Physical Chemistry C     Full-text available via subscription   (Followers: 28)
Journal of Physical Oceanography     Full-text available via subscription   (Followers: 11)
Journal of Physical Organic Chemistry     Hybrid Journal   (Followers: 7)
Journal of Physics A : Mathematical and Theoretical     Hybrid Journal   (Followers: 19)
Journal of Physics and Chemistry of Solids     Hybrid Journal   (Followers: 5)
Journal of Physics D : Applied Physics     Hybrid Journal   (Followers: 12)
Journal of Physics: Condensed Matter     Hybrid Journal   (Followers: 6)
Journal of Physics: Conference Series     Open Access   (Followers: 2)
Journal of Polymer Science Part B: Polymer Physics     Hybrid Journal   (Followers: 23)
Journal of Porous Materials     Hybrid Journal   (Followers: 3)
Journal of Porphyrins and Phthalocyanines     Hybrid Journal   (Followers: 1)
Journal of Quantitative Spectroscopy and Radiative Transfer     Hybrid Journal   (Followers: 1)
Journal of Reinforced Plastics and Composites     Hybrid Journal   (Followers: 30)
Journal of Research in Physics     Open Access   (Followers: 14)
Journal of Rheology     Full-text available via subscription   (Followers: 4)
Journal of Sandwich Structures and Materials     Hybrid Journal   (Followers: 3)
Journal of Scientific Research     Open Access  
Journal of Semiconductors     Full-text available via subscription   (Followers: 2)
Journal of Sensors     Open Access   (Followers: 18)
Journal of Sol-Gel Science and Technology     Hybrid Journal  
Journal of Solid State Lighting     Open Access  
Journal of Spectroscopy     Open Access   (Followers: 7)
Journal of Superconductivity and Novel Magnetism     Partially Free  
Journal of Synchrotron Radiation     Hybrid Journal   (Followers: 4)
Journal of Testing and Evaluation     Full-text available via subscription   (Followers: 19)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 25)
Journal of the Brazilian Society of Mechanical Sciences     Open Access   (Followers: 2)
Journal of the ICRU     Hybrid Journal  
Journal of the Korean Physical Society     Partially Free  
Journal of Theoretical and Applied Physics     Open Access   (Followers: 7)
Journal of Tissue Engineering     Open Access   (Followers: 6)
Journal of Ultrasound in Medicine     Full-text available via subscription   (Followers: 10)
Journal of Vibration and Control     Hybrid Journal   (Followers: 38)
Journal of Visualization     Hybrid Journal   (Followers: 2)
Journal of Zhejiang University SCIENCE A     Hybrid Journal  
Jurnal Fisika     Open Access  
Jurnal NEUTRINO     Open Access  
Jurnal Pendidikan Fisika     Open Access   (Followers: 1)
Jurnal Pendidikan Fisika Indonesia (Indonesian Journal of Physics Education)     Open Access   (Followers: 1)
Jurnal Penelitian Sains (JPS)     Open Access  
Karbala International Journal of Modern Science     Open Access   (Followers: 3)
Lasers in Surgery and Medicine     Hybrid Journal   (Followers: 1)
Latvian Journal of Physics and Technical Sciences     Open Access  
Learning Technologies, IEEE Transactions on     Hybrid Journal   (Followers: 14)
Les Houches Summer School Proceedings     Full-text available via subscription   (Followers: 1)
Letters in Mathematical Physics     Hybrid Journal   (Followers: 4)
Light : Science & Applications     Open Access  
Living Reviews in Relativity     Open Access  
Living Reviews in Solar Physics     Open Access   (Followers: 1)
Lubrication Science     Hybrid Journal   (Followers: 1)
Macalester Journal of Physics and Astronomy     Open Access   (Followers: 3)
Machining Science and Technology: An International Journal     Hybrid Journal   (Followers: 3)
Magnetic Resonance Materials in Physics, Biology and Medicine     Hybrid Journal   (Followers: 2)
Magnetics Letters, IEEE     Hybrid Journal   (Followers: 6)
MAPAN     Hybrid Journal  
Mass Spectrometry Reviews     Hybrid Journal   (Followers: 29)
Matéria (Rio de Janeiro)     Open Access   (Followers: 1)
Materials & Design     Hybrid Journal   (Followers: 39)
Materials at High Temperatures     Full-text available via subscription   (Followers: 5)
Materials Chemistry and Physics     Full-text available via subscription   (Followers: 14)
Materials Research     Open Access   (Followers: 8)
Materials Research Bulletin     Hybrid Journal   (Followers: 22)
Materials Research Innovations     Hybrid Journal   (Followers: 1)
Materials Science     Hybrid Journal   (Followers: 8)
Materials Science and Engineering: A     Hybrid Journal   (Followers: 41)
Materials Science and Engineering: B     Hybrid Journal   (Followers: 19)
Materials Science and Engineering: C     Hybrid Journal   (Followers: 19)
Materials Science and Engineering: R: Reports     Hybrid Journal   (Followers: 16)
Materials Science and Technology     Hybrid Journal   (Followers: 39)
Matériaux & Techniques     Full-text available via subscription   (Followers: 2)
Mathematical Physics, Analysis and Geometry     Hybrid Journal   (Followers: 1)
Mathematics and Mechanics of Solids     Hybrid Journal   (Followers: 2)
Matter and Radiation at Extremes     Open Access  
Meccanica     Hybrid Journal  
Mechanics of Advanced Materials and Structures     Hybrid Journal   (Followers: 4)
Mechanics of Materials     Hybrid Journal   (Followers: 19)
Mechanics of Time-Dependent Materials     Hybrid Journal   (Followers: 1)
Mechanics Research Communications     Hybrid Journal   (Followers: 2)
Metamaterials     Hybrid Journal   (Followers: 2)
Micro and Nano Systems Letters     Open Access   (Followers: 5)
Microfluidics and Nanofluidics     Hybrid Journal   (Followers: 10)
Microporous and Mesoporous Materials     Hybrid Journal   (Followers: 6)
Modern Instrumentation     Open Access   (Followers: 27)
Modern Physics Letters A     Hybrid Journal   (Followers: 15)
Modern Physics Letters B     Hybrid Journal   (Followers: 9)
Molecular Astrophysics     Full-text available via subscription  
Molecular Diversity     Hybrid Journal  
MOMENTO - Revista de Física     Open Access  
Moscow University Physics Bulletin     Hybrid Journal  
Multibody System Dynamics     Hybrid Journal   (Followers: 1)
NANO     Hybrid Journal   (Followers: 6)
Nano Letters     Full-text available via subscription   (Followers: 57)
Nano Reviews & Experiments     Open Access   (Followers: 12)
Nano-Micro Letters     Open Access   (Followers: 1)
NanoBioImaging     Open Access  
Nanomechanics     Open Access  
Nanoscale and Microscale Thermophysical Engineering     Hybrid Journal   (Followers: 3)

  First | 1 2 3 | Last

Journal Cover Flexible Services and Manufacturing Journal
  [SJR: 1.325]   [H-I: 34]   [1 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1936-6582 - ISSN (Online) 1936-6590
   Published by Springer-Verlag Homepage  [2336 journals]
  • Extraction and visualization of industrial service portfolios by text
           mining of 10-K annual reports
    • Authors: Jihwan Lee; Yoo S. Hong
      Pages: 551 - 574
      Abstract: Abstract As more and more manufacturing companies accumulate profits from service provision, the ability to monitor the adoption of the industrial services of other companies grows more important. The purpose of this paper is to propose a data-driven methodology for extraction of the industrial service portfolio from a company’s annual report. In this approach, form 10-K, a special format of annual report regulated by the Security Exchange Commission in United States is utilized as the data source. Because this document type contains rich information on a company’s operating segments, industrial service information is easily retrieved. Given the sheer volume of such documents, however, manual inspection is impractical. In order to resolve this issue, a text-mining algorithm is applied to automatically examine word-usage patterns and to identify the service portfolio. Then, the service portfolio’s relative position in the market is visualized on a positioning map. Due to the multi-dimensionality of the data, self-organizing map (SOM) is used as an alternative visualization scheme. SOM enables easy identification of the major service clusters as well as niche areas in the market; these, in turn, provide valuable information pertinent to service development planning. Also, and not least, policy makers can utilize our methodology to detect the servitization trends of various industries.
      PubDate: 2016-12-01
      DOI: 10.1007/s10696-015-9235-1
      Issue No: Vol. 28, No. 4 (2016)
  • Erratum to: Extraction and visualization of industrial service portfolios
           by text mining of 10-K annual reports
    • Authors: Jihwan Lee; Yoo S. Hong
      Pages: 575 - 575
      PubDate: 2016-12-01
      DOI: 10.1007/s10696-016-9243-9
      Issue No: Vol. 28, No. 4 (2016)
  • A novel multistage deep belief network based extreme learning machine
           ensemble learning paradigm for credit risk assessment
    • Authors: Lean Yu; Zebin Yang; Ling Tang
      Pages: 576 - 592
      Abstract: Abstract To achieve high assessment accuracy for credit risk, a novel multistage deep belief network (DBN) based extreme learning machine (ELM) ensemble learning methodology is proposed. In the proposed methodology, three main stages, i.e., training subsets generation, individual classifiers training and final ensemble output, are involved. In the first stage, bagging sampling algorithm is applied to generate different training subsets for guaranteeing enough training data. Second, the ELM, an effective AI forecasting tool with the unique merits of time-saving and high accuracy, is utilized as the individual classifier, and diverse ensemble members can be accordingly formulated with different subsets and different initial conditions. In the final stage, the individual results are fused into final classification output via the DBN model with sufficient hidden layers, which can effectively capture the valuable information hidden in ensemble members. For illustration and verification, the experimental study on one publicly available credit risk dataset is conducted, and the results show the superiority of the proposed multistage DBN-based ELM ensemble learning paradigm in terms of high classification accuracy.
      PubDate: 2016-12-01
      DOI: 10.1007/s10696-015-9226-2
      Issue No: Vol. 28, No. 4 (2016)
  • RFID analytics for hospital ward management
    • Authors: Chun-Hung Cheng; Yong-Hong Kuo
      Pages: 593 - 616
      Abstract: Abstract In this paper, we present an RFID-enabled platform for hospital ward management. Active RFID tags are attached to individuals and assets in the wards. Active RFID readers communicate with the tags continuously and automatically to keep track of the real-time information about the locations of the tagged objects. The data regarding the locations and other transmitted information are stored in the ward management system. This platform enables capabilities of real-time monitoring and tracking of individuals and assets, reporting of ward statistics, and providing intelligence and analytics for hospital ward management. All of these capabilities benefit hospital ward management by enhanced patient safety, increased operational efficiency and throughput, and mitigation of risk of infectious disease widespread. A prototype developed based on our proposed architecture of the platform was tested in a pilot study, which was conducted in two medical wards of the intensive care unit of one of the largest public general hospitals in Hong Kong. This pilot study demonstrates the feasibility of the implementation of this RFID-enabled platform for practical use in hospital wards. Furthermore, the data collected from the pilot study are used to provide data analytics for hospital ward management.
      PubDate: 2016-12-01
      DOI: 10.1007/s10696-015-9230-6
      Issue No: Vol. 28, No. 4 (2016)
  • A new approach to the Container Positioning Problem
    • Authors: Jonas Ahmt; Jonas Skott Sigtenbjerggaard; Richard Martin Lusby; Jesper Larsen; David Ryan
      Pages: 617 - 643
      Abstract: Abstract In this paper the Container Positioning Problem is revisited. This problem arises at busy container terminals and requires one to minimize the use of block cranes in handling the containers that must wait at the terminal until their next means of transportation. We propose a new Mixed Integer Programming model that not only improves on earlier attempts at this problem, but also better reflects reality. In particular, the proposed model adopts a preference to reshuffle containers in line with a just-in-time concept, as it is assumed that data is more accurate the closer to a container’s scheduled departure the time is. Other important improvements include a reduction in the model size, and the ability of the model to consider containers initially at the terminal. In addition, we describe several classes of valid inequalities for this new formulation and present a rolling horizon based heuristic for solving larger instances of the problem. We show that this new formulation drastically outperforms previous attempts at the problem through a direct comparison on instances available in the literature. Furthermore, we also show that the rolling horizon based heuristic can further reduce the solution time on the larger of these instances as well as find acceptable solutions to much bigger, artificially generated, instances.
      PubDate: 2016-12-01
      DOI: 10.1007/s10696-015-9228-0
      Issue No: Vol. 28, No. 4 (2016)
  • Pricing storage of outbound containers in container terminals
    • Authors: Youn Ju Woo; Jang-Ho Song; Kap Hwan Kim
      Pages: 644 - 668
      Abstract: Abstract In container yard of container terminals, a storage charge is imposed to encourage customers to limit the space required for their containers. This study addresses the storage price scheduling problem for the storage of outbound containers. The price schedule consists of the free-time limit, which is the maximum duration for a container to stay in the yard without any charge, and storage charge per day for storing a container past the free-time-limit. Empirical data suggests that the efficiency of loading operations significantly depends on the space utilized by a vessel’s outbound containers. Mathematical models are developed to determine the optimal storage price schedule in such a manner that the terminal’s total profit is maximized or the total system’s cost is minimized. Both single and multi-vessel cases are considered. Properties of the optimal solution are derived from the mathematical models and numerical experiments are conducted to validate solutions.
      PubDate: 2016-12-01
      DOI: 10.1007/s10696-016-9245-7
      Issue No: Vol. 28, No. 4 (2016)
  • Comparison of three flow line layouts with unreliable machines and profit
    • Authors: Guan Wang; Yang Woo Shin; Dug Hee Moon
      Pages: 669 - 693
      Abstract: Abstract Manufacturing system design is a complex challenge when a new factory is being built. Although some factories produce the same product, the layouts of the factories may be different. Manufacturing systems for automotive engines can be modelled with several types of queueing networks with finite buffers and unreliable machines. In this paper, three types of layout structures which are commonly used in automotive engine shops are compared with respect to maximizing profit that is determined by throughput and the investment cost of buffers. We assume that the service times are constant but inhomogeneous, and the time to failure and the time to repair are exponentially distributed. To solve this problem we used approximation methods which are based on aggregation and overlapping decomposition for computing performance measures, and a gradient search method for finding an optimal buffer allocation.
      PubDate: 2016-12-01
      DOI: 10.1007/s10696-015-9233-3
      Issue No: Vol. 28, No. 4 (2016)
  • A note on the selection of priority rules in software packages for project
    • Authors: Philipp Baumann; Norbert Trautmann
      Pages: 694 - 702
      Abstract: Abstract Various software packages for project management include a procedure for resource-constrained scheduling. In several packages, the user can influence this procedure by selecting a priority rule. However, the resource-allocation methods that are implemented in the procedures are proprietary information; therefore, the question of how the priority-rule selection impacts the performance of the procedures arises. We experimentally evaluate the resource-allocation methods of eight recent software packages using the 600 instances of the PSPLIB J120 test set. The results of our analysis indicate that applying the default rule tends to outperform a randomly selected rule, whereas applying two randomly selected rules tends to outperform the default rule. Applying a small set of more than two rules further improves the project durations considerably. However, a large number of rules must be applied to obtain the best possible project durations.
      PubDate: 2016-12-01
      DOI: 10.1007/s10696-016-9236-8
      Issue No: Vol. 28, No. 4 (2016)
  • An optimization approach for designing routes in metrological control
           services: a case study
    • Authors: Jose Carlos Molina; Ignacio Eguia; Jesus Racero
      Abstract: Abstract This paper is the first to tackle the problem of designing routes in service companies that are responsible for the metrological control of measuring equipments at customer sites. This real-world problem belongs to the well-known Rich Vehicle Routing Problems which combine multiple attributes that distinguish them from traditional vehicle routing problems. The attributes include fixed heterogeneous fleet of vehicles, time windows for customers and depot, resource synchronization between tours, driver-customer and vehicle-customer constraints, customer priorities and unserved customers. This routing and scheduling problem is modeled with linear programming techniques and solved by a variable neighborhood descent metaheuristic based on a tabu search algorithm with a holding list. A real-life case study faced by a company in the region of Andalusia (Spain) is also presented in this work. The performance of the metaheuristic is compared with the literature for the standard fixed heterogeneous vehicle routing problem. Results obtained on a real case instance improve the solutions implemented by the company.
      PubDate: 2016-11-25
      DOI: 10.1007/s10696-016-9265-3
  • Improving surgical outcomes through optimal volumes allocation
    • Authors: Arianna Alfieri; Elisabetta Listorti; Andrea Matta
      Abstract: Abstract In this paper, we propose an innovative managerial use of the volume-outcome association, a relation that associates higher volume of activity to better results. We analyze how this relation can be used to help decision makers in allocating surgery interventions among health care structures, a relevant long term planning problem. We analytically study different objective functions in order to drive the allocation process towards better health conditions for patients. We provide a decision support tool for health policy makers, which helps achieving better population health, in terms of quality and fairness. Our approach has been tested on three case studies taking into account real life factors such as geographical distribution of hospitals, specialization thresholds and hospital performance. Results have been compared to the real data from the Italian National Outcome Evaluation Program.
      PubDate: 2016-11-23
      DOI: 10.1007/s10696-016-9266-2
  • A flexible crane scheduling methodology for container terminals
    • Authors: Guvenc Dik; Erhan Kozan
      Abstract: Abstract In this paper, we propose a flexible neighbourhood search strategy for quay crane scheduling problems based on the framework of tabu search (TS) algorithm. In the literature, the container workload of a ship is partitioned into a number of fixed jobs to deal with the complexity of the problem. In this paper, we propose flexible jobs which are dynamically changed by TS throughout the search process to eliminate the impact of fixed jobs on the generated schedules. Alternative job sequences are investigated for quay cranes and a new quay crane dispatching policy is developed to generate schedules. Computational experiments conducted with problem instances available in the literature showed that our algorithm is capable of generating quality schedules for quay crane handling operations at reasonable times.
      PubDate: 2016-11-08
      DOI: 10.1007/s10696-016-9264-4
  • Multi-criteria decision making approaches for green supply chains: a
    • Authors: Aleksander Banasik; Jacqueline M. Bloemhof-Ruwaard; Argyris Kanellopoulos; G. D. H. Claassen; Jack G. A. J. van der Vorst
      Abstract: Abstract Designing Green Supply Chains (GSCs) requires complex decision-support models that can deal with multiple dimensions of sustainability while taking into account specific characteristics of products and their supply chain. Multi-Criteria Decision Making (MCDM) approaches can be used to quantify trade-offs between economic, social, and environmental criteria i.e. to identify green production options. The aim of this paper is to review the use of MCDM approaches for designing efficient and effective GSCs. We develop a conceptual framework to find relevant publications and to categorise papers with respect to decision problems, indicators, and MCDM approaches. The analysis shows that (1) the use of MCDM approaches for designing GSCs is a rather new but emerging research field, (2) most of the publications focus on production and distribution problems, and there are only a few inventory models with environmental considerations, (3) the majority of papers assume all data to be deterministic, (4) little attention has been given to minimisation of waste, (5) numerous indicators are used to account for eco-efficiency, indicating the lack of standards. This study, therefore, identifies the need for more multi-criteria models for real-life GSCs, especially with inclusion of uncertainty in parameters that are associated with GSCs.
      PubDate: 2016-11-04
      DOI: 10.1007/s10696-016-9263-5
  • Analyzing complex service structures in liner shipping network design
    • Authors: Kristian Thun; Henrik Andersson; Marielle Christiansen
      Abstract: Abstract One of the most important strategic decisions of a liner shipping company is the design of a set of cyclic routes, services, for container vessels to provide transport for goods from origins to destinations. This problem is called the liner shipping network design problem (LSNDP). The cyclic nature of the services as well as the possibility of transshipping cargoes between services makes the problem difficult to solve for large instances. Therefore, it is common to make assumptions regarding the structure of the services. We analyze the effect of different structures ranging from simple ones visiting a port once in a service, to butterfly services where one port can be visited twice in a service and a more general structure where every port in a service can be visited more than once. To perform these analyses, we have developed a new mathematical model for the LSNDP where there are no limitations on the number of visits to each port. The model is solved by a branch-and-price method, where we for the sake of computational time have reduced the number of visits per port on a service to a maximum of two. The computational study shows that complex service structures can create more cost-efficient networks and that the objective value can be improved by allowing general service structures even for small sized instances.
      PubDate: 2016-11-02
      DOI: 10.1007/s10696-016-9262-6
  • MIP formulations for an application of project scheduling in human
           resource management
    • Authors: Tom Rihm; Norbert Trautmann; Adrian Zimmermann
      Abstract: Abstract In the literature, various discrete-time and continuous-time mixed-integer linear programming (MIP) formulations for project scheduling problems have been proposed. The performance of these formulations has been analyzed based on generic test instances. The objective of this study is to analyze the performance of discrete-time and continuous-time MIP formulations for a real-life application of project scheduling in human resource management. We consider the problem of scheduling assessment centers. In an assessment center, candidates for job positions perform different tasks while being observed and evaluated by assessors. Because these assessors are highly qualified and expensive personnel, the duration of the assessment center should be minimized. Complex rules for assigning assessors to candidates distinguish this problem from other scheduling problems discussed in the literature. We develop two discrete-time and three continuous-time MIP formulations, and we present problem-specific lower bounds. In a comparative study, we analyze the performance of the five MIP formulations on four real-life instances and a set of 240 instances derived from real-life data. The results indicate that good or optimal solutions are obtained for all instances within short computational time. In particular, one of the real-life instances is solved to optimality. Surprisingly, the continuous-time formulations outperform the discrete-time formulations in terms of solution quality.
      PubDate: 2016-10-28
      DOI: 10.1007/s10696-016-9260-8
  • Stochastic programming for flexible global supply chain planning
    • Authors: Yingjie Fan; Frank Schwartz; Stefan Voß; David L. Woodruff
      Abstract: Abstract When ocean transportation is used, possible disruptions both at sea and on land should be taken into account in the planning process of the affected supply chain. In this paper, a framework to enable flexible global supply chain operational planning in stochastic environments is presented. In order to cope with unexpected events like natural or man-made disasters, flexible international long-distance transportation modes and postponement strategies are taken into account in our supply chain model. In order to balance supply chain costs and the flexibility of supply chains, a two-stage multi-scenario stochastic programming model is developed where the stochastic events are represented by corresponding scenarios. High quality solutions of all our problem instances are generated by using a Python based stochastic programming framework to solve the model. Finally, managerial insights related to flexible supply chain planning in stochastic environments are derived from our computational results.
      PubDate: 2016-10-07
      DOI: 10.1007/s10696-016-9261-7
  • Freight consolidation in intermodal networks with reloads
    • Abstract: Abstract Intermodal networks offer much flexibility in transport planning, and have the potential to efficiently consolidate goods, even if these goods have distinct pickup locations and destinations. Typically, there is an abundant amount of feasible routes and consolidation opportunities, which makes it challenging to quickly identify good solutions. We propose a planning algorithm for dynamic pickup- and delivery problems in intermodal networks, where freight is consolidated by means of reloads to reduce both costs and emissions. Based on an enumerative arc-expansion procedure, a large number of intermodal routes is generated for each order, of which we store the k best. We subsequently evaluate consolidation opportunities for the k best routes by applying a decision tree structure, taking into account reload operations, timetables, and synchronization of departure windows. Compared to direct road transport, numerical experiments on various virtual problem instances show an average cost saving of 34 %, and an average reduction in \(CO_2\) emissions of 30 %. Furthermore, we test our algorithm on a real-life case of a leading logistics service provider based in the Netherlands, which yields significant benefits as well, both in terms of costs and environmental impact.
      PubDate: 2016-09-28
      DOI: 10.1007/s10696-016-9259-1
  • The regional port competition with different terminal competition
    • Authors: Mingzhu Yu; Chung-Yee Lee; James Jixian Wang
      Abstract: Abstract This paper studies the regional container port competition problem which involves two port cities each with its own container terminal. We provide two-level game-theoretic models to characterize several practice-related issues, such as container terminal cooperation situation, and the difference between local in/out and transshipment container throughputs. Numerical experiments are conducted based on the port system in the Pearl River Delta area of China. We find that (1) the two ports in the heterogeneous regional port system should focus on differentiating services rather than compete with each other in every service; (2) the terminal cooperation may not be preferred by both of the port city governments; (3) the developed port will gradually dominate the transshipment container business in the system, leaving the developing port to focus its efforts on the local in/out container business instead.
      PubDate: 2016-09-24
      DOI: 10.1007/s10696-016-9254-6
  • Workload balancing: staffing ratio analysis for primary care redesign
    • Authors: Xiang Zhong; Hyo Kyung Lee; Molly Williams; Sally Kraft; Jeffery Sleeth; Richard Welnick; Lori Hauschild; Jingshan Li
      Abstract: Abstract The objective of this paper is to investigate the staffing composition of chief care providers (e.g., physician (MD)) and support staff (e.g., medical assistant (MA)) under various task assignment settings to achieve the optimal operational efficiency. Specifically, we examine the effects of workload shifting and identify the proper ratio of MDs to MAs to attain an effective and efficient service level. Based on a Markov chain based framework that characterizes care providers’ activities during patients’ primary care clinic visits, analytical investigation and numerical experiments are conducted. The results articulate that the optimal staffing ratio is achieved when the workloads of MDs and MAs are balanced. To validate the findings under generic primary care clinic settings, discrete event simulation models are developed and extensive experiments are carried out. The sensitivity study elucidates that the balanced-workload optimality is not affected by system variations in patient volume, as well as arrival and service time distributions.
      PubDate: 2016-09-23
      DOI: 10.1007/s10696-016-9258-2
  • Batch scheduling in the histopathology laboratory
    • Authors: A. G. Leeftink; R. J. Boucherie; E. W. Hans; M. A. M. Verdaasdonk; I. M. H. Vliegen; P. J. van Diest
      Abstract: Abstract Histopathology laboratories aim to deliver high quality diagnoses based on patient tissue samples. Timely and high quality care are essential for delivering high quality diagnoses, for example in cancer diagnostics. However, challenges exist regarding employee workload and tardiness of results, which both impact the diagnostic quality. In this paper the histopathology operations are studied, where tissue processors are modeled as batch processing machines. We develop a new 2-phased decomposition approach to solve this NP-hard problem, aiming to improve the spread of workload and to reduce the tardiness. The approach embeds ingredients from various planning and scheduling problems. First, the batching problem is considered, in which batch completion times are equally divided over the day using a Mixed Integer Linear Program. This reduces the peaks of physical work available in the laboratory. Second, the remaining processes are scheduled to minimize the tardiness of orders using a list scheduling algorithm. Both theoretical as well as historical data were used to assess the performance of the method. Results show that using this decomposition method, the peaks in histopathology workload in UMC Utrecht, a large university medical center in The Netherlands, may be reduced with up to 50 % by better spreading the workload over the day. Furthermore, turnaround times are reduced with up to 20 % compared to current practices. This approach is currently being implemented in the aforementioned hospital.
      PubDate: 2016-09-21
      DOI: 10.1007/s10696-016-9257-3
  • The impact of lanes segmentation and booking levels on a container
           terminal gate congestion
    • Authors: María D. Gracia; Rosa G. González-Ramírez; Julio Mar-Ortiz
      Abstract: Abstract Recent trends in port performance improvement include the coordination of intermodal transport logistics to reduce congestion and inefficiencies generated at the gates of the terminals. Congestion at the gate of a terminal generates several problems such as pollution and long waiting times for truck carriers. As part of the strategies and best practices to reduce congestion, some ports worldwide have implemented advanced booking systems in order to coordinate truck arrivals and deliveries at the gate of their container terminals. We will refer to these systems as truck appointment systems. In general terms, a truck appointment system provides a mechanism where truck carriers coordinate their time of arrival at the container terminal based on an advanced booking. In this way, gate managers are able to better plan their port operations and equipment allocation, to reduce the waiting times of trucks and improve the turnaround time for container deliveries. In order to account for the real benefits of such systems, the particular conditions of each container terminal need to be considered. In this paper, a case study of a Chilean port terminal is analyzed. The aim is to provide recommendations that may reduce congestion and improve the container terminal´s gate control of truck arrivals, turnaround times and container deliveries by means of efficient lane segmentation policies. Several scenarios were examined under which different booking levels are considered for an environment in which the arrival of containers can vary significantly from day to day and on a seasonal basis. As a basis for our study a fractional factorial design is performed in order to analyze the impact of controllable factors on two service levels measures, which reduce the number of scenarios needed to obtain robust conclusions.
      PubDate: 2016-09-09
      DOI: 10.1007/s10696-016-9256-4
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Heriot-Watt University
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