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  Subjects -> PHYSICS (Total: 804 journals)
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PHYSICS (584 journals)            First | 1 2 3 | Last

Showing 201 - 400 of 741 Journals sorted alphabetically
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: 1)
International Journal of Microstructure and Materials Properties     Hybrid Journal   (Followers: 7)
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: 1)
International Journal of Modern Physics B     Hybrid Journal   (Followers: 1)
International Journal of Modern Physics C     Hybrid Journal   (Followers: 1)
International Journal of Modern Physics D     Hybrid Journal   (Followers: 1)
International Journal of Modern Physics E     Hybrid Journal   (Followers: 3)
International Journal of Nanomanufacturing     Hybrid Journal  
International Journal of Nanoscience     Hybrid Journal   (Followers: 2)
International Journal of Nanotechnology     Hybrid Journal   (Followers: 4)
International Journal of Non-Linear Mechanics     Hybrid Journal   (Followers: 6)
International Journal of Physical Sciences     Open Access  
International Journal of Physics     Open Access  
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: 1)
International Journal of Theoretical Physics     Hybrid Journal   (Followers: 2)
International Journal of Thermal Sciences     Hybrid Journal   (Followers: 10)
International Letters of Chemistry, Physics and Astronomy     Open Access   (Followers: 3)
International Materials Reviews     Hybrid Journal   (Followers: 12)
Inverse Problems     Hybrid Journal   (Followers: 2)
IOP Conference Series: Materials Science and Engineering     Open Access   (Followers: 5)
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: 2)
Journal of Adhesion Science and Technology     Hybrid Journal   (Followers: 7)
Journal of Advanced Physics     Full-text available via subscription  
Journal of Advances in Physics     Open Access   (Followers: 6)
Journal of Applied Mathematics and Mechanics     Full-text available via subscription   (Followers: 5)
Journal of Applied Mathematics and Physics     Open Access  
Journal of Applied Mechanics and Technical Physics     Hybrid Journal   (Followers: 3)
Journal of Applied Physics     Hybrid Journal   (Followers: 76)
Journal of Applied Remote Sensing     Hybrid Journal   (Followers: 34)
Journal of Applied Spectroscopy     Hybrid Journal   (Followers: 9)
Journal of Astrophysics     Open Access   (Followers: 2)
Journal of Astrophysics and Astronomy     Open Access   (Followers: 17)
Journal of Basic and Applied Physics     Open Access   (Followers: 1)
Journal of Building Physics     Hybrid Journal   (Followers: 1)
Journal of Chromatographic Science     Hybrid Journal   (Followers: 20)
Journal of Complex Networks     Hybrid Journal   (Followers: 1)
Journal of Composite Materials     Hybrid Journal   (Followers: 216)
Journal of Computational Methods in Physics     Open Access  
Journal of Computational Physics     Hybrid Journal   (Followers: 53)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 1)
Journal of Dynamic Systems, Measurement, and Control     Full-text available via subscription   (Followers: 11)
Journal of Elasticity     Hybrid Journal   (Followers: 4)
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: 2)
Journal of Electronics Cooling and Thermal Control     Open Access   (Followers: 3)
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: 2)
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: 28)
Journal of Gravity     Open Access  
Journal of High Energy Astrophysics     Full-text available via subscription   (Followers: 1)
Journal of High Energy Physics     Hybrid Journal   (Followers: 4)
Journal of Hydrogels     Full-text available via subscription  
Journal of Hyperspectral Remote Sensing     Open Access   (Followers: 14)
Journal of Imaging     Open Access   (Followers: 2)
Journal of Information Display     Hybrid Journal  
Journal of Intelligent Material Systems and Structures     Hybrid Journal   (Followers: 3)
Journal of Lightwave Technology     Hybrid Journal   (Followers: 5)
Journal of Low Frequency Noise, Vibration and Active Control     Full-text available via subscription   (Followers: 6)
Journal of Luminescence     Hybrid Journal   (Followers: 3)
Journal of Materials Engineering and Performance     Hybrid Journal   (Followers: 24)
Journal of Materials Physics and Chemistry     Open Access   (Followers: 1)
Journal of Materials Science     Hybrid Journal   (Followers: 18)
Journal of Materials Science : Materials in Electronics     Hybrid Journal   (Followers: 3)
Journal of Materials Science : Materials in Medicine     Hybrid Journal   (Followers: 4)
Journal of Mathematical Fluid Mechanics     Hybrid Journal   (Followers: 5)
Journal of Mathematical Physics     Hybrid Journal   (Followers: 3)
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: 8)
Journal of Modern Physics     Open Access   (Followers: 2)
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: 3)
Journal of Nepal Physical Society     Open Access  
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 7)
Journal of Nonlinear Dynamics     Open Access  
Journal of Nonlinear Mathematical Physics     Hybrid Journal   (Followers: 1)
Journal of Nuclear Physics, Material Sciences, Radiation and Applications     Open Access  
Journal of Optics     Hybrid Journal   (Followers: 4)
Journal of Physical and Chemical Reference Data     Hybrid Journal   (Followers: 4)
Journal of Physical Chemistry B     Full-text available via subscription   (Followers: 36)
Journal of Physical Chemistry C     Full-text available via subscription   (Followers: 27)
Journal of Physical Oceanography     Full-text available via subscription   (Followers: 9)
Journal of Physical Organic Chemistry     Hybrid Journal   (Followers: 7)
Journal of Physics A : Mathematical and Theoretical     Hybrid Journal   (Followers: 5)
Journal of Physics and Chemistry of Solids     Hybrid Journal   (Followers: 5)
Journal of Physics D : Applied Physics     Hybrid Journal   (Followers: 9)
Journal of Physics: Condensed Matter     Hybrid Journal   (Followers: 7)
Journal of Physics: Conference Series     Open Access   (Followers: 2)
Journal of Plasma Physics     Hybrid Journal   (Followers: 5)
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  
Journal of Rheology     Full-text available via subscription   (Followers: 4)
Journal of Romance Studies     Full-text available via subscription   (Followers: 2)
Journal of Sandwich Structures and Materials     Hybrid Journal   (Followers: 2)
Journal of Scientific Research     Open Access   (Followers: 1)
Journal of Semiconductors     Full-text available via subscription   (Followers: 2)
Journal of Sensors     Open Access   (Followers: 15)
Journal of Sol-Gel Science and Technology     Hybrid Journal  
Journal of Solid State Lighting     Open Access  
Journal of Solid State Physics     Open Access   (Followers: 1)
Journal of Spectroscopy     Open Access   (Followers: 7)
Journal of Superconductivity and Novel Magnetism     Partially Free  
Journal of Synchrotron Radiation     Hybrid Journal   (Followers: 3)
Journal of Testing and Evaluation     Full-text available via subscription   (Followers: 18)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 22)
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: 1)
Journal of Tissue Engineering     Open Access   (Followers: 6)
Journal of Ultrasound in Medicine     Full-text available via subscription   (Followers: 7)
Journal of Vibration and Control     Hybrid Journal   (Followers: 35)
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 Indonesia (Indonesian Journal of Physics Education)     Open Access  
Jurnal Penelitian Fisika dan Aplikasinya     Open Access  
Jurnal Penelitian Sains (JPS)     Open Access  
Karbala International Journal of Modern Science     Open Access   (Followers: 2)
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: 8)
Les Houches Summer School Proceedings     Full-text available via subscription   (Followers: 1)
Letters in Mathematical Physics     Hybrid Journal   (Followers: 2)
Light : Science & Applications     Open Access  
Living Reviews in Relativity     Open Access  
Living Reviews in Solar Physics     Open Access   (Followers: 1)
Lubrication Science     Hybrid Journal  
Macalester Journal of Physics and Astronomy     Open Access   (Followers: 2)
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: 5)
MAPAN     Hybrid Journal  
Mass Spectrometry Reviews     Hybrid Journal   (Followers: 28)
Matéria (Rio de Janeiro)     Open Access   (Followers: 1)
Materials & Design     Hybrid Journal   (Followers: 39)
Materials at High Temperatures     Full-text available via subscription   (Followers: 4)
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: 41)
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     Full-text available via subscription  
Meccanica     Hybrid Journal  
Mechanics of Advanced Materials and Structures     Hybrid Journal   (Followers: 3)
Mechanics of Materials     Hybrid Journal   (Followers: 18)
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: 4)
Microfluidics and Nanofluidics     Hybrid Journal   (Followers: 10)
Microporous and Mesoporous Materials     Hybrid Journal   (Followers: 6)
Modern Instrumentation     Open Access   (Followers: 17)
Modern Physics Letters A     Hybrid Journal  
Modern Physics Letters B     Hybrid Journal   (Followers: 1)
Molecular Diversity     Hybrid Journal  
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)
Nanoscale Research Letters     Open Access   (Followers: 3)

  First | 1 2 3 | Last

Journal Cover Flexible Services and Manufacturing Journal
  [SJR: 1.277]   [H-I: 28]   [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  [2335 journals]
  • Quay crane scheduling problem with considering tidal impact and fuel
    • Abstract: Abstract This study investigates a quay crane scheduling problem with considering the impact of tides in a port and fuel consumption of ships. A mixed-integer nonlinear programming model is proposed. Some nonlinear parts in the model are linearized by approximation approaches. For solving the proposed model in large-scale problem instances, both a local branching based solution method and a particle swarm optimization based solution method are developed. Numerical experiments with some real-world like cases are conducted to validate the effectiveness of the proposed model and the efficiency of the proposed solution methods.
      PubDate: 2016-07-16
  • Solving the pre-marshalling problem to optimality with A* and IDA*
    • Abstract: Abstract We present a novel solution approach to the container pre-marshalling problem using the A* and IDA* algorithms combined with several novel branching and symmetry breaking rules that significantly increases the number of pre-marshalling instances that can be solved to optimality. A* and IDA* are graph search algorithms that use heuristics combined with a complete graph search to find optimal solutions to problems. The container pre-marshalling problem is a key problem for container terminals seeking to reduce delays of inter-modal container transports. The goal of the container pre-marshalling problem is to find the minimal sequence of container movements to shuffle containers in a set of stacks such that the resulting stacks are arranged according to the time each container must leave the stacks. We evaluate our approach on three well-known datasets of pre-marshalling problem instances, solving over 500 previously unsolved instances to optimality, which is nearly twice as many instances as the current state-of-the-art method solves.
      PubDate: 2016-07-06
  • Pricing storage of outbound containers in container terminals
    • 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: 2016-06-18
  • Improving the efficiency of a hospital emergency department: a simulation
           study with indirectly imputed service-time distributions
    • Abstract: Abstract This paper presents a case study which uses simulation to analyze patient flows in a hospital emergency department in Hong Kong. We first analyze the impact of the enhancements made to the system after the relocation of the Emergency Department. After that, we developed a simulation model (using ARENA) to capture all the key relevant processes of the department. When developing the simulation model, we faced the challenge that the data kept by the Emergency Department were incomplete so that the service-time distributions were not directly obtainable. We propose a simulation–optimization approach (integrating simulation with meta-heuristics) to obtain a good set of estimate of input parameters of our simulation model. Using the simulation model, we evaluated the impact of possible changes to the system by running different scenarios. This provides a tool for the operations manager in the Emergency Department to “foresee” the impact on the daily operations when making possible changes (such as, adjusting staffing levels or shift times), and consequently make much better decisions.
      PubDate: 2016-06-01
  • Operating room scheduling and rescheduling: a rolling horizon approach
    • Abstract: Abstract In this work we consider the problem of selecting a set of patients among a given waiting list of elective patients and assigning them to a set of available operating room blocks. We assume a block scheduling strategy in which the number and the length of available blocks are given. As each block is related to a specific day, by assigning a patient to a block his/her surgery date is fixed, as well. Each patient is characterized by a recommended maximum waiting time and an uncertain surgery duration. In practical applications, new patients enter the waiting list continuously. Patient selection and assignment is performed by surgery departments on a short-term, usually a week, regular base. We propose a so-called rolling horizon approach for the patient selection and assignment. At each iteration short-term patient assignment is decided. However, in a look-ahead perspective, a longer planning horizon is considered when looking for the patient selection. The mid-term assignment over the next \(n\) weeks is generated by solving an ILP problem, minimizing a penalty function based on total waiting time and tardiness of patients. The approach is iteratively applied by shifting ahead the mid-term planning horizon. When applying the first week solution, unpredictable extensions of surgeries may disrupt the schedule. Such disruptions are recovered in the next iteration: the mid-term solution is rescheduled limiting the number of variations from the previously computed plan. Besides, the approach allows to deal with new patient arrivals. To keep limited the number of disruptions due to uncertain surgery duration, we propose also a robust formulation of the ILP problem. The deterministic and the robust formulation based frameworks are compared over a set of instances, including different stochastic realization of surgery times.
      PubDate: 2016-06-01
  • An analytical representation of flexible resource allocation in hospitals
    • Abstract: Abstract Non-linear processes within complex systems are difficult to predict. Using discrete event simulation (DES) models can be helpful for presenting the uncertainty level embedded within these processes. However, the interpretations of the resulting outcomes can be challenging to analyze. This is evident when experimenting with simulation models, and therefore requires the adaptation of existing models. Introducing cyclic entities such as interconnected resources to the simulation model adds a new level of complexity to the model. In practical cases, decision makers often demand a model that enables them to make quick decisions with less complexity involved. However, these individuals still want to be assured of a high degree of accuracy in the results. This article demonstrates how an analytical representation of complex DES models can be developed in order to facilitate prompt yet effective solutions for decision makers. This analytical representation provides a brief overview of the simulation results by using the staff scheduling and nurses’ utilization approaches. Results of the effective use of DES model and managers feedback are encouraging.
      PubDate: 2016-06-01
  • Operations management in the home care services: a heuristic for the
           caregivers’ routing problem
    • Abstract: Abstract Home Care Services (HCS) aim at providing complex coordinated health care for patients at their homes. This paper addresses the challenges of routing and scheduling HCS caregivers under precedence and coordination constraints, with patients receiving multiple caregivers. Moreover, the visits are performed simultaneously and possibly in a predefined order. The routing problem involves a fleet of vehicles to serve a number of customers at different locations. The objective is to find the minimal round for vehicle, while satisfying all the customers and without violating customers’ time windows. It has been proved that the complexity of the caregivers routing problem is linked to both (1) the number of care activities per caregiver ratio and (2) the temporal dependencies rate. Given the poor performance of the mathematical modeling based on exact approaches, a heuristic approach called the Caregivers Routing Heuristic (CRH) has been developed and tested using real size instances. In fact, the exact approaches are not able to solve real size instances. The performance of the CRH has been evaluated using real size instances. The numerical results show that the CRH is very efficient in terms of computation times. Otherwise, the CRH is less sensitive than the exact approaches to both complexity axes: the temporal dependencies constraints and the ratio of the number of care activities per caregiver.
      PubDate: 2016-06-01
  • Evaluating the impact of flexible practices on the master surgical
           scheduling process: an empirical analysis
    • Abstract: Abstract This study focuses on the master surgical scheduling problem and adds two main contributions. First, it presents a novel mixed integer programming model to support the master surgical schedule production. Second, it uses the model to investigate the impact, in terms of scheduled surgeries, of the flexible management of three critical resources, namely surgical teams, operating rooms and surgical units. Our analysis revealed that to maximise the number of surgeries scheduled, it is sufficient to introduce flexibility with respect to surgical teams and ORs. In fact, if both these resources are managed flexibly, then introducing flexibility with respect to surgical units carries no additional advantages. However, if surgical teams or ORs (or both) are not managed flexibly, then managing surgical units flexibly produces significant benefits. In addition, our study shows that if surgical teams cannot be managed flexibly, then introducing flexibility with respect to ORs yields significant benefits. Similarly, it reveals that if ORs cannot be managed flexibly, then introducing flexibility with respect to surgical teams yields significant benefits as well. The work is based on real data from the Meyer University Children’s Hospital in Florence.
      PubDate: 2016-06-01
  • Design and analysis of gastroenterology (GI) clinic in Digestive Health
           Center of University of Wisconsin Health
    • Abstract: Abstract This paper is devoted to the design and analysis of the gastroenterology (GI) clinic in the Digestive Health Center (DHC) of University of Wisconsin Health. The DHC will consolidate several existing clinic and endoscopy locations into a single center. First, the work flow at a current GI clinic is studied. A Markov chain model is developed and then extended to non-Markovian case to evaluate patient average length of stay and staff utilization. The model is validated by the data observed in the clinic. It is shown that the model can provide accurate estimation of system performance. Then, using such a model, design options of the new GI clinic in the DHC are studied. To investigate the impact of different system configurations, what-if analyses are carried out and different patient check-out processes are investigated. Finally, recommendations for enhancing service at the new GI clinic are proposed to the DHC leadership.
      PubDate: 2016-06-01
  • The patient assignment problem in home health care: using a data-driven
           method to estimate the travel times of care givers
    • Abstract: Abstract Home health care is one of the recent service systems where human resource planning has a great importance. The assignment of patients to care givers is a relevant issue that the home health care service provider must address before generating the daily routes. The assignment decision is typically made without knowing the visiting sequence, which creates some uncertainties and disparities regarding the effective workload of care givers. However, taking into account travel times in the care giver workload while solving the assignment problem is not straightforward, because travel times can also be affected by clinical conditions of patients and their homes. Providing good travel time estimates that would be used in the assignment decision is the specific topic this paper focuses on. In particular, we propose a data-driven method to estimate the travel times of care givers in the assignment problem when their routes are not available yet. The method, based on the Kernel regression technique, uses the travel times observed from previous periods to estimate the time necessary for visiting a set of patients located in specific geographical locations. The main advantage offered by this technique is the empirical modelling of the travel routes generated by care givers. Numerical results based on realistic problem instances indicate that the proposed estimation method performs better than the average value and k-nearest neighbor search methods and can be successfully used in a two-stage approach that first assigns patients to care givers and then defines their routes.
      PubDate: 2016-06-01
  • Combining syndromic surveillance and ILI data using particle filter for
           epidemic state estimation
    • Abstract: Abstract Designing effective mitigation strategies against influenza outbreak requires an accurate prediction of a disease’s future course of spreading. Real time information such as syndromic surveillance data and influenza-like-illness (ILI) reports by clinicians can be used to generate estimates of the current state of spreading of a disease. Syndromic surveillance data are immediately available, in contrast to ILI reports that require data collection and processing. On the other hand, they are less credible than ILI data because they are essentially behavioral responses from a community. In this paper, we present a method to combine immediately-available-but-less-reliable syndromic surveillance data with reliable-but-time-delayed ILI data. This problem is formulated as a non-linear stochastic filtering problem, and solved by a particle filtering method. Our experimental results from hypothetical pandemic scenarios show that state estimation is improved by utilizing both sets of data compared to when using only one set. However, the amount of improvement depends on the relative credibility and length of delay in ILI data. An analysis for a linear, Gaussian case is presented to support the results observed in the experiments.
      PubDate: 2016-06-01
  • A hierarchical facility layout planning approach for large and complex
    • Abstract: Abstract The transportation processes for patients, personnel, and material in large and complex maximum-care hospitals with many departments can consume significant resources and thus induce substantial logistics costs. These costs are largely determined by the allocation of the different departments and wards in possibly multiple connected hospital buildings. We develop a hierarchical layout planning approach based on an analysis of organizational and operational data from the Hannover Medical School, a large and complex university hospital in Hannover, Germany. The purpose of this approach is to propose locations for departments and wards for a given system of buildings such that the consumption of resources due to those transportation processes is minimized. We apply the approach to this real-world organizational and operational dataset as well as to a fictitious hospital building and analyze the algorithmic behavior and resulting layout.
      PubDate: 2016-06-01
  • Integrated scheduling of elective surgeries and surgical nurses for
           operating room suites
    • Abstract: Abstract Facing an acute shortage of surgical nurses, operating room suites in China are more and more aware of the need to use surgical nurses efficiently. This goal is hard to achieve due to the strong interactions between the nurse and the surgery scheduling process. This paper addresses the benefit of integrating elective surgery and surgical nurse scheduling in terms of nurse utilization. First, an integer programming (IP) model is proposed to schedule elective surgeries and surgical nurses simultaneously. Then an efficient genetic algorithm (GA) is proposed based on the IP formulation due to the computational complexity of the integrated scheduling problem. A case study using real-life data is presented to validate the performance of the integrated approaches (the IP model and the GA) by comparing them with a two-stage approach that schedules elective surgeries and surgical nurses sequentially.
      PubDate: 2016-06-01
  • Control problems and management policies in health systems: application to
           intensive care units
    • Abstract: Abstract The stochastic nature of both patient arrivals and lengths of stay leads inevitably to periodic bed shortages in healthcare units. Physicians are challenged to fit demand to service capacity. If all beds are occupied eligible patients are usually referred to another ward or hospital and scheduled surgeries may be cancelled. Lack of beds may also have consequences for patients, who may be discharged in advance when the number of occupied beds is so high as to compromise the medical care of new incoming patients. In this paper we deal with the problem of obtaining efficient bed-management policies. We introduce a queuing control problem in which neither the arrival rates nor the number of servers can be modified. Bed occupancy control is addressed by modifying the service time rates, to make them dependent on the state of the system. The objective functions are two quality-of-service components: to minimize patient rejections and to minimize the length of stay shortening. The first objective has a clear mathematical formulation: minimize the probability of rejecting a patient. The second objective admits several formulations. Four different expressions, all leading to nonlinear optimization problems, are proposed. The solutions of these optimization problems define different control policies. We obtain the analytical solutions by adopting Markov-type assumptions and comparing them in terms of the two quality-of-service components. We extend these results to the general case using optimization with simulation, and propose a way to simulate general length of stay distributions enabling the inclusion of state-dependent service rates.
      PubDate: 2016-06-01
  • Patient admission planning using Approximate Dynamic Programming
    • Abstract: Abstract Tactical planning in hospitals involves elective patient admission planning and the allocation of hospital resource capacities. We propose a method to develop a tactical resource allocation and patient admission plan that takes stochastic elements into consideration, thereby providing robust plans. Our method is developed in an Approximate Dynamic Programming (ADP) framework and copes with multiple resources, multiple time periods and multiple patient groups with uncertain treatment paths and an uncertain number of arrivals in each time period. As such, the method enables integrated decision making for a network of hospital departments and resources. Computational results indicate that the ADP approach provides an accurate approximation of the value functions, and that it is suitable for large problem instances at hospitals, in which the ADP approach performs significantly better than two other heuristic approaches. Our ADP algorithm is generic, as various cost functions and basis functions can be used in various hospital settings.
      PubDate: 2016-06-01
  • A Bayesian framework for describing and predicting the stochastic demand
           of home care patients
    • Abstract: Abstract Home care providers are complex structures which include medical, paramedical and social services delivered to patients at their domicile. High randomness affects the service delivery, mainly in terms of unplanned changes in patients’ conditions, which make the amount of required visits highly uncertain. Hence, each reliable and robust resource planning should include the estimation of the future demand for visits from the assisted patients. In this paper, we propose a Bayesian framework to represent the patients’ demand evolution along with the time and to predict it in future periods. Patients’ demand evolution is described by means of a generalized linear mixed model, whose posterior densities of parameters are obtained through Markov chain Monte Carlo simulation. Moreover, prediction of patients’ demands is given in terms of their posterior predictive probabilities. In the literature, the stochastic description of home care patients’ demand is only marginally addressed and no Bayesian approaches exist to the best of our knowledge. Results from the application to a relevant real case show the applicability of the proposed model in the practice and validate the approach, since parameter densities in accordance to clinical evidences and low prediction errors are found.
      PubDate: 2016-06-01
  • A policy management game for mass casualty incidents: an experimental
    • Abstract: Abstract The number of complex and unique mass casualty incidents has increased due to natural and technological disasters as well as man-made disasters such as political instabilities, economic recession, and terrorism. Thus, health care policy-makers such as the Austrian Samaritan Organization have been continuously improving the training of emergency staff to enable them to quickly evacuate an emergency site, to minimize the number of fatalities at the incident site, and to decrease the patients’ waiting time for treatment. We developed a policy management game to provide a training tool for emergency staff to support such policy-makers. In addition, with this game students can be educated on scheduling and planning techniques such as simulation, queuing theory, and resource allocation. To investigate the potential of our policy management game, we conducted an experimental study with 96 participants including students, practitioners from health care services, and researchers. They acted as incident commanders to decide on sending medical staff to triage, to different treatment rooms for care and to on-site transportation, as well as to transportation to hospitals during three game runs. The participants rated the general structure and organization of the experiment as high. The performance was also improved by many participants during the experiment. We found differences in performance among the different participant groups.
      PubDate: 2016-06-01
  • Solving integrated production and condition-based maintenance planning
           problems by MIP modeling
    • Abstract: Abstract It has been demonstrated that integrating maintenance scheduling and production planning can lead to substantial savings. However in these works the associated optimization problems are solved by enumerating all (exponentially many) maintenance schedules. This has led these researchers to either solve instances of very small sizes, or consider cyclic maintenance schedules only to limit the possibilities to a small (polynomial) number. We show here how to formulate these problems as (strong) mixed-integer linear programs, and then solve them using off-the-shelve MIP solvers. We demonstrate the efficiency of the proposed approach to solve problems of up to 10 products and 24 time periods, sizes that were simply unreachable before. We also illustrate the value of using non-cyclic maintenance schedules when the demand varies over time, with savings of up to 41 % compared to cyclic schedules.
      PubDate: 2016-05-03
  • Erratum to: Extraction and visualization of industrial service portfolios
           by text mining of 10-K annual reports
    • PubDate: 2016-04-26
  • Health Care Systems Engineering
    • PubDate: 2015-12-12
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
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