22 research outputs found
Sociaal beleid en medezeggenschap
No full textIn 'Sociaal beleid en medezeggenschap' wordt aandacht besteed aan de ontwikkelingen in de zeventiger en tachtiger jaren op het terrein van het sociaal beleid en de invloed van werknemers op dit beleid in Nederland. Uitgangspunt van dit boek is de stelling dat universiteiten en ondernemingen voldoende met elkaar gemeen hebben om een vergelijking tussen deze beide typen organisaties zinvol te doen zijn. Met dit boek beoogt de auteur ook een bijdrage te leveren aan de aktuele diskussie omtrent het bedrijfsmatiger werken van overheidsorganisaties. Het boek verschaft de lezer inzicht in de vele belangrijke veranderingen die er in de afgelopen jaren hebben plaatsgevonden op het gebied van sociaal beleid en medezeggenschap. Het kan gebruikt worden als studieboek door studenten van sociale akademies en universiteiten, maar ook als naslagwerk door degenen die in dé praktijk met personeelswerk bezig zijn. De auteur is als universitair docent verbonden aan de sectie Arbeids- en Organisatiesociologie van de vakgroep Techniek, Arbeid en Organisatie van de TU-Delft
Efficient Mathematical Modeling for Bioprocesses - based on macroscopic balances and neural networks
No full textApplied Science
Evaluation of Inter Terminal Transport Configurations at the Maasvlakte 1 and 2 using Discrete Event Simulation
No full textOver the past decades there has been an increasing demand in global containerized transport. Because of this demand the Port of Rotterdam was forced to expand its Maasvlakte 1 with the new Maasvlakte 2. It is expected that in 2040 the combined Maasvlakte 1 + 2 will handle at least 30 million TEU, which is almost four times as much as the entire Port of Rotterdam is handling now [10]. With this rise in container transport and new container terminals being built at the Maasvlakte 2, there will also be a rise in Inter Terminal Transport (ITT). Inter terminal transport is the transport of containers between terminals in a port. The ITT system for the Maasvlakte is being analyzed within the project \Inter-terminal transport on Maasvlakte 1 and 2 in 2030 - Towards a multidisciplinary and innovative approach on future inter-terminal transport options.". It is a joint project between Delft University of Technology, Erasmus University Rotterdam and the Port of Rotterdam Authority. The goal of the project is to develop innovative, non-conventional concepts for ITT for the port of Rotterdam. Within this project, expected transport demand scenarios for 2030 have been defined by Rick Jansen [27]. An integer programming model was used by Frans Nieuwkoop [41] to find rough estimations of the optimal transport configurations for the given transport demand scenarios. The question that remains is \Which of the defined ITT vehicle configurations is the best configuration seen from an operational perspective?"...Mechanical, Maritime and Materials EngineeringMarine and Transport TechnologyTransport Engineering and Logistics2014.TEL.782
Uncertainty-based project planning
No full textMany projects executed within organizations fail due to budget and time overruns. The goals for time and budget are often related to the planning of a project. However, due to unforeseen factors the execution often deviates from the initial project planning. These unforeseen factors can be led back to the extent to which a project is susceptible to uncertainties and risks. This thesis research has investigated to what extent it is possible to improve the front-end project planning on basis of theories on project risk and uncertainty. For this purpose a framework for assessing this risk and uncertainty is developed. This framework consists of four dimensions: novelty, technology, pace and complexity. The latter is divided into three sub-dimensions: technical, organizational and environmental complexity. The research tests this framework for a specific group of companies. These are project-based organizations (PBO) that produce complex product systems (CoPS). One such company was used in this research in a multiple case study approach in which 23 cases were selected. These individual case studies included a document analysis in which the resource hours of the project administration were studied and a semi-structured interview with the project manager. After the individual case studies were performed a cross case analysis was done for the entire group of cases. The results have shown that each of the individual dimensions influences the execution of the project and thus should influence the planning in a different way. 1) Novelty influences the clarity of internal tasks and processes and therefore the planning of these relies more on estimations than calculations. The level of novelty therefore gives an indication of the required buffers in hours and timespan that will be required throughout the project. 2) Technology uncertainty influences the amount of technical iterations (design, build, and test). This uncertainty of the technical development phase should be incorporated in the planning in the form of buffers for the technical resources. 3) A higher degree of pace requires more priority from the project team. Also, teams should be smaller to work more efficient and to reduce bureaucracy and formalization. 4) The three dimensions of complexity were studied by collecting all factors mentioned in the interviews that have led to complexity in the studied cases. The complexity of a project can therefore be assessed by the factors that are applicable to that project. Even though specific factors have specific impact on the project, in general terms it has been found that technical complexity relates to the amount of technical development and coordination hours as well as time delays in the latter phase of the project. Organizational complexity relates to the efficiency of the work of the project team and the amount of internal coordination. Finally Environmental complexity has been found to have a severe impact on external coordination of the stakeholders by the project manager and possible time delays due to dependencies on stakeholders. All the empirical data and results of the cross case analysis are incorporated in a planning tool. This tool enables a project manager to assess a project front-end on the level of risk and uncertainty this project is susceptible to. It also indicates in which dimension the risk and uncertainty is situated and it gives qualitative advice on how to incorporate buffers in timespan and hours in the project planning. This tool can therefore help a project manager in developing a more accurate project planning. The main conclusions of this study are therefore that by assessing the project risk and uncertainty in this way, it is possible to develop a more accurate project planning and with this possibly enhance the project success.Technology, Strategy & EntrepreneurshipTechnology, Policy and Managemen
Evaluation of inter terminal transport configurations at Rotterdam Maasvlakte using discrete event simulation
No full textIn this paper, various Inter Terminal Transport (ITT) systems for the Port of Rotterdam are evaluated. The Port Authority is investigating possible solutions for the transport of containers between terminals at the existing so-called Maasvlakte 1 and new Maasvlakte 2 areas within the port. A discrete event simulation model is presented that incorporates traffic modeling, which means that delays occurring due to traffic will have an impact on the system's performance. The model is applied to four different ITT vehicle configurations, including Automated Guided Vehicles (AGVs), Automated Lifting Vehicles (ALVs), Multi Trailer Systems (MTSs) and a combination of barges and trucks. Furthermore, three realistic demand scenarios for the year 2030 are used for the analysis.Marine and Transport TechnologyMechanical, Maritime and Materials Engineerin
Micromechanical modeling of stress evolution induced during cure in a particle-filled electronic packaging polymer
No full textMechanical, Maritime and Materials Engineerin
Investigation on flip chip solder joint fatigue with cure-dependent underfill properties
No full textMeasuring femoral lesions despite CT metal artefacts: A cadaveric study
No full textObjective Computed tomography is the modality of choice for measuring osteolysis but suffers from metal-induced artefacts obscuring periprosthetic tissues. Previous papers on metal artefact reduction (MAR) show qualitative improvements, but their algorithms have not found acceptance for clinical applications. We investigated to what extent metal artefacts interfere with the segmentation of lesions adjacent to a metal femoral implant and whether metal artefact reduction improves the manual segmentation of such lesions. Materials and methods We manually created 27 periprosthetic lesions in 10 human cadaver femora. We filled the lesions with a fibrotic interface tissue substitute. Each femur was fitted with a polished tapered cobalt-chrome prosthesis and imaged twice—once with the metal, and once with a substitute resin prosthesis inserted. Metalaffected CTs were processed using standard back-projection as well as projection interpolation (PI) MAR. Two experienced users segmented all lesions and compared segmentation accuracy. Results We achieved accurate delineation of periprosthetic lesions in the metal-free images. The presence of a metal implant led us to underestimate lesion volume and introduced geometrical errors in segmentation boundaries.MediamaticsElectrical Engineering, Mathematics and Computer Scienc
Pan-Antarctic analysis aggregating spatial estimates of Adélie penguin abundance reveals robust dynamics despite stochastic noise
No full text© The Author(s), 2017. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Nature Communications 8 (2017): 832, doi:10.1038/s41467-017-00890-0.Colonially-breeding seabirds have long served as indicator species for the health of the oceans on which they depend. Abundance and breeding data are repeatedly collected at fixed study sites in the hopes that changes in abundance and productivity may be useful for adaptive management of marine resources, but their suitability for this purpose is often unknown. To address this, we fit a Bayesian population dynamics model that includes process and observation error to all known Adélie penguin abundance data (1982–2015) in the Antarctic, covering >95% of their population globally. We find that process error exceeds observation error in this system, and that continent-wide “year effects” strongly influence population growth rates. Our findings have important implications for the use of Adélie penguins in Southern Ocean feedback management, and suggest that aggregating abundance across space provides the fastest reliable signal of true population change for species whose dynamics are driven by stochastic processes.H.J.L., C.C.-C., G.H., C.Y., and K.T.S. gratefully acknowledge funding provided by US National Aeronautics and Space Administration Award No. NNX14AC32G and U.S. National Science Foundation Office of Polar Programs Award No. NSF/OPP-1255058. S.J., L.L., M.M.H., Y.L., and R.J. gratefully acknowledge funding provided by US National Aeronautics and Space Administration Award No. NNX14AH74G. H.J.L., C.Y., S.J., Y.L., and R.J. gratefully acknowledge funding provided by U.S. National Science Foundation Office of Polar Programs Award No. NSF/PLR-1341548. S.J. gratefully acknowledges support from the Dalio Explore Fund
