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Quiescent periods for helicopter landing on ships

19-01-2017 - Helicopter landing operations on ships are dominated by the expectation that ship motions will stay inside operational limits for a given time. For naval ships the main criterium is the touch down conditions. The minimal duration of an operational window is expressed in tens of seconds. The assessment of this expectation is done by the landing officer on theView problem details

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The fair value of a mortgage

14-12-2016 - ABN AMRO is a retail bank and mortgages are an important part of the core business model. The balance sheet covers over EUR. 150 billion in residential mortgages, which is about 40% of the total assets. In order to properly steer the balance sheet and manage the banks risks it is essential to correctly estimateView problem details

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Analyzing and Predicting Impact Created by Accidents on Road Networks

13-12-2016 - Road networks are becoming more and more vulnerable for incidents as a result of an increasing level of congestion.  Predicting ‘reliably’ the expected time of arrival (ETA) is therefore becoming a serious challenge as incidents/accidents occurrence is quite a random process and their impact depends on a variety of factors making it far from trivialView problem details


Numerical-physical modelling of miscible fluids in pipeline transport

01-12-2016 - In the oil and gas industry hydrocarbons are transported through long pipelines under various conditions. This transport process generally involves multiple chemical components present in multiple phases (oil, gas, water). The mathematical modelling and simulation of these problems is often done with one-dimensional models that treat the phases as immiscible. However, a particular case thatView problem details

Trespa International

30-11-2016 -

The Bourdon bell and the skewed tower (Oude Kerk Delft)

- The first parish church of Delft, the old church, was built around 1200. In front of the church a 75 meters high tower, with brickwork spire and four turrets, was built in 1350. Even during its construction, the tower was plagued by subsidence. This could be because the water in the Oude Delft had toView problem details

Zoning problem in determining environmental impacts of traffic (Demis)

- Introduction Traffic has impacts on the environment. Traffic models are normally used to calculate the traffic intensities on the road network. The calculated traffic intensities form the basis for calculating the environmental impacts. In the impact assessment the traffic intensities are are converted to width of the zone that has negative impacts of the traffic.View problem details

Leakage Detection Method (X-flow)

- For the purification of water hollow fiber membranes are increasingly being used. These are porous reeds with a diameter of between 1 to 2 mm, made by a particular type of plastic. The ‘wall’ of these reeds has a fine porous structure that is permeable for water, but not for particles of a certain sizes.View problem details

ADR-option pricing (AOT)

- Problem The problem AOT presents is that of ADR-option pricing. In the brief outline below the problem and its setting is described. In the final presentation of the problem a brief introduction to options and option pricing will be given, such that the jargon will be clear. ADRs As a stock and derivative trading firmView problem details

Is there a financial life after an error? (Rekenkamer)

- In many cases accountants make their judgment on a financial report based on samples taking at random. An approval is issued when the data in the report satisfies a given reliability interval (often a reliability of 95% is used), i.e., the errors found in the samples is not exceeding a certain critical value. In realityView problem details

The rotor spinning process for fibre production (Twaron)

- At Teijin Twaron in Arnhem new ways of producing fibres are being developed. One of the interesting new techniques is “The Rotor Spinning Process”. In principle, this process looks a lot like the making of sugarfloss (or cotton candy) at the carnival / fair. Here, however, we deal with a polymer-filled disc with tiny holes.View problem details

Reconstruction of sea-surface temperatures using fossil marine plankton (NOZ)

- The predictive quality of climate models can be enhanced by incorporating information about temperatures from the past. A number of methods have been developed to determine the ancient temperatures of the upper ocean, and one of these is based on the use of deep sea micro fossils. For many millions of years a large numberView problem details


Parameters to grow roses (Phytocare)

- In Agriculture the key point is optimizing the production at limited costs. For decennia already, one has tried for the best and one cannot do without a computer anymore. In present-day greenhouses the control of the inner climate is fully automated. The inner climate could be held constant, but for the optimization of the productionView problem details

Aquarium Problem (Artis)

- The Artis Zoo has a problem in its Aquarium and in the adjacent Zoological Museum. Situation Part of the Aquarium is a corridor which contains so called mammoth tanks which measure 5 by 2.5 by 20 meters and are filled with water. Because of the tropical fish inside, the water should have a temperature ofView problem details

Compression of data (Philips)

- Philips Natlab is looking for new ways to compress audio-signals. Situation A new method for the digital representation of high quality audio signals has been introduced as an alternative to the widely used 16-bit recording format used for CD signals. This new method [3] produces 1-bit samples at a rate that typically is 64 timesView problem details

Design Automation: Component placement op chips (Magma)

- The ‘holey cheese’ problem One of the steps in the design process of chips is the positioning of every single component or ‘cell’ on the chip. The cells are mutually connected by wires. The wiring scheme is given, and in this phase of the design process the positioning of the various cells must be determined.View problem details

Diffusion of euro coins over Europe (Eurodiffusie)

- Een van de problemen bij de Studiegroep wiskunde met de Industrie in februari 2002 was het modelleren van het zogenaamde eurodif- fusieproces. Dit probleem heeft landelijk veel aandacht getrokken. Gevraagd werd een model te maken voor de bewegingen van euro- munten over de twaalf eurolanden. Hoe snel gaan euro’s van het ene naar het andereView problem details

Instability in the spinning of fibers (Akzo Nobel)

13-11-2016 - A well-known problem in the spinning of fibers by drawing a liquid through a spin hole, is that when the speed is increased, there appears an instability in the sense that the cross section of the filament is no longer independent of time. In fact oscillations arise at a large speed of spinning. In 1969View problem details

Pattern recognition in CT scans (Daniel den Hoed kliniek)

- When making a diagnosis using a CT scan one looks for spherical shapes amidst bones and lung tissue. Where the bones show a value of 1000 on the CT san and air and lung tissue are at 0, the spheres distinguish themselves at a value of around 150. For the automatic pattern recognition one canView problem details

Laser percussion drilling (Eldim)

- Laser materials processing is well accepted in the industry. Most important applications are cutting, welding and marking. Drilling is a niche application. Only 2% of the system sold is used for drilling. In the gas turbine manufacturing, laser percussion drilling is used to drill film cooling holes. The typical hole diameter is 0.5 to 1.0View problem details

ADSL modems (KPN)

- The Transmission Control Protocol (TCP) is a well-used protocol to send information files over the Internet. The essence of this protocol is that the total quantity of information is divided into a number of smaller packages. Sending the data error-free is made possible by detecting the packages in which an error has occurred and resendingView problem details

The t-factor for a non Gauss-distribution (NMI)

- For a small sample from a normal or Gauss-distribution, it has been derived by Student with which factor one has to multiply the standard deviation of the sample such that, with a certain probability, the center of the distribution is found in the interval on both sides of the average of the sample, with sizeView problem details

Pressing of a corner profile (Trespa)

- In the fabrication of office desks and plates for walls, Trespa presses thermally layers of paper impregnated with resin. During the heating process (up to 160 degrees at 90 bar) polymerisation of the resin occurs and a densification takes place up to 70 per cent. In a related process for the fabrication of wood fibreView problem details


The behaviour of a droplet of polymer solution in an ink-jet printer (Philips)

12-11-2016 - Light-emitting polymer displays are a new, interesting flat display principle. The active material in the display is a  very thin semi-conducting polymer layer of order 100 nanometer. To obtain these thin layers a small concentration of the polymer is dissolved in a suitable solvent. Different colours can be obtained with different polymers. To make aView problem details


Probability model for marks and prints

- From the Nederlands Forensisch Instituut there are two related problems, one about so-called toolmarks and the other about shoeprints. Toolmarks appear when at a burglary a tool (a screwdriver or crowbar) is being used to break a door or window open. This tool leaves a mark: in the door post for example a mark orView problem details

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Performance Forecast of a Flight Schedule

- In search of a quick method to forecast the quality of a flight schedule Situation KLM flies to over 150 destinations with 97 aircraft. Four times a year, a new flight schedule is developed. Though the operational feasibility is taken into account up to a certain degree during the development process, the aim at thatView problem details


How to hang bells and wire construction of a carillon in a tower (het nationaal Beiaard Museum)

- A carillon consists of approximately 20 up to 45 bells. These bells hang in an open lantern-tower (like the Munttoren in Amsterdam) or inside a tower under the roof. A carillon is played using a keyboard that is generally located one story below the bells. A wire connects each clapper to the keyboard. The oldestView problem details


Problems surrounding the expanding Pacific oyster in the Eastern Scheldt

- History of oysters Flat oysters have been commercially cultured in the Eastern Scheldt Estuary (The Netherlands) since 1875. After the severe winter of 1962/1963, which caused a high mortality, the stock was diminished. Searching for alternatives, Dutch oyster farmers introduced the Pacific oyster to the Eastern Scheldt in 1964. The Pacific oyster is native toView problem details


Weighing schemes

04-11-2016 - For the calibration of weights with various nominal masses, metrology institutes use special weight sets. For instance the decade from 1000 g to 100 g is ‘covered’ by six weights : 1000 g, 500 g, 2 x 200 g and 2 x 100 g. In order to be able to distinguish between weights with theView problem details


Partitioning a Call Graph

- A company has a large software system that has become costly to maintain. What they need to do is break the system into smaller more manageable modules. Of course, this is a job for a trained expert. However, when the system is large an automated suggestion for a partition into modules is useful. Given aView problem details


Spatiotemporal patterns in high-density surface electromyography

- Being recorded at the skin, a surface electromyographic signal (sEMG) reflects the electrical activity of an underlying muscle (or group of muscles). Hence, sEMG offers a fairly simple, non-invasive way to assess the activation of superficial muscles. The signal is an integral measure summing action potentials of many motor units, i.e. groups of muscle fibersView problem details


Dealing with selection effects in forensic science

- Many areas of forensic science deal with questions concerning the selection of evidence. If certain features are used to select a suspect from a large group of potential suspects, can you use the same features as evidence in a legal case against the suspect? If the answer is yes, is the evidential value the sameView problem details


Planning drinking water with a handicap

- Part of the planning of each KLM flight consists in determining the quantity of drinking water to take on board. Risking a water shortage is not an option, wheareas a surplus will cost unnecessary extra fuel. However, reading off the level of the water tanks can not be done accurately: on most airplanes, the waterView problem details


Warming up bodies after invasive surgery

- Hypothermia is used in a number of invasive cardiosurgical procedures. In limited hypothermia, a routine procedure in open heart surgery, the human body is cooled down to 32 degrees Celcius, whereas in deep hypothermia, which is used less frequently, body temperatures go down as far as 20 degrees. The actual cooling of the body isView problem details


Gossiping to Optimality

02-11-2016 - Analysis and optimization of message delivery in wireless sensor networks Chess is a company of about 160 employees, with locations in Haarlem and Best, that offers products, solutions and services in the field of electronics, IT-applications and embedded software. One of the projects of Chess has to do with ‘wireless sensor networks’. Suppose that aView problem details


Calibration of pressure measurement

- In pressure measurement the value of pressure is determined by dividing the force exterted on a piston by the effective area of the piston. The effective area of the piston may differ from the actual area because of irregularities at the piston edge and because of leakage through the thin cavity between the piston andView problem details


Bullet-proof Math

- Twaron is a strong fiber. Teijin Twaron is a split off from AKZO-Nobel, and is now part of Teijin, a Japanese company. Teijin Twaron is responsible for developing the Twaron fiber and its applications. One of the applications of Twaron is in bullet-proof vests. Twaron is interested in finding the velocity at which only aView problem details


Radiological Needlework

- Nucletron is a high-tech, international company, that specializes in equipment for medical diagnostics. Problem description To treat prostate cancer with radiological techniques, the prostate is perforated with a number of needles. Before the radiological treatment may start, the exact positions of these needles must be known. To detect these positions, an ultra-sound sensor is used.View problem details


Catching Gas with Droplets

- At DSM one is interested in the development of packaging materials that are not or little permeable for certain gases. Think of the packaging of meat in a polymer sheet, that should keep the meat free from oxygen. The idea to realize this is to include in the sheet of packaging material droplets that absorbView problem details


Optimizing software release policy

- ASML is a company located in Veldhoven that builds machines for manufacturers of computer chips. The software of these machines ASML sells now consists of one large package, a so called monolith. Their current policy is to release a new version of this entire monolith approximately every nine months. This monolithic approach has a fewView problem details


Mathematical challenge waterboard Regge en Dinkel

- Mathematical challenge waterboard Regge en Dinkel The waterboard Regge en Dinkel is responsible for the watermanagement of 1300 km2 in the eastern part of the Netherlands. The expected climate change will affect the watersystem; more and heavier rainfall will result in increasing discharge en flooding. The waterboard has three strategies to deal with these problems:View problem details

Plaatje1-problem RD
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Rapid calculation of the radiofrequency field pattern in MRI

01-11-2016 - Introduction The physical principle of MRI is based upon the application of a strong static magnetic field to the patient. This field forces the magnetic spin moment of hydrogen nuclei in the patients to precess around the external field with a particular frequency which scales proportionally with the magnetic field strength. Central in the imagingView problem details

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Optimizing the function of artificial heart pumps in humans

- In acute heart failure, the cardiologist or cardio-thoracic surgeon may introduce a catheter-mounted pump into the left heart chamber. The left heart chamber is responsible for maintaining the circulation through the following organs: brains, muscles, intestines, kidneys etc. Therefore, acute heart failure, and specifically heart failure of the left chamber, results in so-called cardiogenic shockView problem details

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Optimizing the reserve strategy of cabin crew at KLM

- The cabin crew of LKM receive a new roster every week, which shows their assignment for the next several weeks. A typical flight assignment consists of several days of duty followed by a number of days off. Such a combination of duty time and free time is fixed for each type of flight and isView problem details

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Improving an equity option pricing model

- Introduction Volatility, i.e., the uncertain fluctuations in the prices of financial assets such as stocks, is of paramount importance in financial markets theory and practice. Volatility characterizes the risk of an investment. Moreover, volatility is a major determinant of the price of a financial derivative. A financial derivative is a contract that derives its valueView problem details

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Optimizing a closed greenhouse by Innogrow

- Innogrow develops and sells a new type of greenhouse, called GeslotenKas®. By closing the windows of a greenhouse and providing it with an integrated climate and energy system, maximal control is obtained over the growth factors and energy use. The closed greenhouse also functions as an energy source. Excess heat is saved in a seasonalView problem details

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A sampling problem

- ASML develops machines to perform the very critical lithographic step in the process of integrated circuit manufacturing. Lithography boils down to exposing a photo lacquer (resist) present on a silicon plaque (wafer) with ultra violet light using a mask (glass plate called reticle with a chrome pattern, derived from the integrated circuit layout, on it).View problem details


Health care expenditures differ significantly between regions in the Netherlands: efficiency or health related?

25-10-2016 - In the Netherlands health care expenses show major differences amongst regions. For instance, citizens of Heerlen had average health care costs of 2811 euro per insured, whereas this was only 1.633 euro in Urk (published by Vektis, a collaboration of health insurance companies). A possible explanation might be that citizens of Urk have a betterView problem details


Economic optimal water safety

- Economic optimal water safety in the Netherlands is since the flood disaster of 1953 an important topic in policy and research. CPB published in 1954 a (social) cost-benefit analysis (CBA) of a comprehensive plan to increase the water security of the Netherlands (Tinbergen, J., 1954, The economic balance of the Delta plan, annex to theView problem details


Parametric roll of ships

11-07-2016 - Introduction ‘Parametric roll’ is a phenomenon that sometimes suddenly occurs to ships sailing in head or following seas. Apparently without any clear reason, the amplitude of the roll motion (i.e. the rotation about the longitudinal axis of the ship) increases within a couple of roll periods, from a few degrees to above 45 degrees. TheseView problem details

SWI 2009 - Parametric Roll of Ships

An objective method to associate local weather extremes

- Local weather extremes, like heavy rainfall or extreme temperatures, are usually connected to characteristic circulation patterns in the atmosphere. The figure below illustrates this fact for daily mean temperatures in July and August as observed in De Bilt. For  two periods with extreme high temperatures the atmospheric circulation deviation from the time-mean flow as characterizedView problem details

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Stiffening While Drying

10-07-2016 - Stiffening While Drying DSM, Geleen Shared Research Unit Performance Materials Introduction Nowadays waterborne coatings (WBC’s) are increasingly replacing traditional organic solvent-borne coatings (SBC’s) in many applications due to stricter legislation originating from an ever-growing environmental awareness in society. One of the few disadvantages of WBC’s is that they generally require longer drying times as comparedView problem details

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Water Pumping Optimization

05-07-2016 - Grimsby Region In the figure the schematic representation of the Grimsby drinking water supply region is given. Characteristics are: The supply regions Smithville, Beamsville and Grimsby are situated at different heights With the use of the water buffers and the water pumps drinking water is transported to the three supply regions. The Pumps can beView problem details


Mixing and Modelling: How Mathematics may mix Molecules

- Introduction. Albemarle is a big chemical concern with about 3700 employees and many plants  worldwide. It is a manufacturer of polymers and fine chemicals, including additives and intermediates used in agricultural and cleaning products, drilling compounds, etcetera. Since mixing of different chemical compounds is one of its core techniques, Albemarle  Research in Amsterdam (former AkzoView problem details


Modeling the Production Process of Nuggets

22-05-2016 - Stork Food Systems Stork Food Systems is the supplier of processing systems for poultry and fresh meat. As a technology market leader, with more than 45 years of experience, process knowledge and proven track record worldwide, we support and equip food processors to create maximum process value now and in the future. Problem description InView problem details


Optimizing Algae Growth

- Phytocare Problem description The runoff water from greenhouses contains fertilizers and must be cleaned before it can be returned to the groundwater system. A means of doing this is to introduce algae into the water. The algae eat up the fertilizer and clean the water. Subsequently, the algae may be removed and sold as feed,View problem details


Thruster Allocation

- Marin MARIN, the Maritime Research Institute Netherlands, has become a reliable, independent and innovative service provider for the maritime sector and a contributor to the well being of society. MARIN has been expanding the boundaries of maritime understanding with hydrodynamic research for over 70 years. Today, this research is applied for the benefit of ConceptView problem details


Scalability of Electricity Grids

- KEMA Leading authority in energy consulting and testing & certification. A global, leading authority in energy consulting and testing & certification, active throughout the entire energy value-chain – in a world of increasing demand for energy, KEMA has a major role to play in ensuring the availability, reliability, sustainability and profitability of energy and relatedView problem details


Smart Positioning Algorithms for Indoor Navigation

-   ESA The European Space Agency (ESA) is an agency for the cooperation among European States in space research, technology and space applications. One of the topics of ESA is Satellite Navigation, being responsible for the construction of the Galileo system and an augmentation-system for GPS. Satellite Navigation has many applications, including route guidance forView problem details


Statkraft problem 2011

21-05-2016 - In any electric system, the generation has to match the consumption at all times. In the European interconnected (UCTE) grid, this balance is maintained by Primary Reserve. The four German grid operators procure their demand of Primary Reserve by means of a monthly auction, which results are publicly accessible. Generation units that can participate inView problem details


NXP problem 2011

- The increasing demand for smaller, faster, and multi-functional electronic devices such as smart phones is one of the driving forces in the semiconductor industry. Combined with requirements on power usage, sustainability, and wireless functionality this is generating challenges in several domains. During the design of the layout, which is a representation of the chip inView problem details


NFI problem 2011

- Causing a lethal vehicle accident as a driver is a serious offense. Especially if driving speed was excessive, imprisonment for a substantial time is likely. The Netherlands Forensic Institute is frequently asked to estimate driving speed based on accident scene data. Estimation is based on a physics model that simulates the crash itself and theView problem details


Marin problem 2011

- Traditionally, the study of the hydromechanic behaviour of ships (and floating bodies in general) is divided into ship hydrostatics (without motions in calm water) and ship hydrodynamics (with motions in either calm water or in waves and/or current). The area of ship hydrodynamics can be roughly divided into powering/propulsion and calm water resistance, seakeeping (motionsView problem details


Deltares problem 2011

- We are interested in the most appropriate way of formulating optimum control problems for heterogeneous, partially controllable water resources systems. These systems often need implicit time stepping schemas for avoiding restrictive stability criteria. This distinguishes them from most technical systems on which control is applied. We are interested in various methods to solve the optimalView problem details


Chess problem 2011

- A defining characteristic of wireless ad hoc networks is their dynamic behavior. In practice, it is not uncommon to find that the topology of even a small network deployed in a controlled environment changes from one moment to the next, without apparent changes to the layout of the nodes. This behavior stems from the inherentView problem details


Optimization of the lifetime of sensor networks

20-05-2016 - Sensor networks and networks of wearable communication systems (for example: networks that support emergency workers in their efforts) have strong requirements on their energy consumption. Instead of only focusing on minimization of energy consumption of the individual nodes (which leads to locally optimal solutions)  it is important to maximize the lifetime of the whole network.View problem details


Image Recognition of Shape Defects in Hot Steel Rolling

- Tata Steel is the 2nd largest steel producer in Europe with major manufacturing sites in the UK, the Netherlands, Germany, France and Belgium. The IJmuiden site in The Netherlands host a fully integrated production process in which coils of coated steel strips are produced out of raw materials such as iron ore and coal. HotView problem details


A new ray-tracing method for non-imaging optics

- Introduction In illumination engineering the transfer of light from the source to the target is computed to obtain photometric quantities like the luminous intensity, color point, and brightness. The technique that is commonly used is the Monte Carlo (MC) ray tracing method that traces randomly rays through an optical system containing components like lenses andView problem details


Structural integrity of marine structures

- Operators of ships and offshore structures face the responsibility of maximising the operational window while taking care of the safety onboard.  Periodic inspections help the operator to assess if the structure is still in one piece and whether repairs are required. Continuous monitoring of the structure’s response as motions and stresses,  is increasingly used toView problem details


Future Challenges in the Electricity Grid

- Endinet is a network company that distributes electricity and gas to various customers in the province of North-Brabant of the Netherlands. Endinet owns the medium (10kV) and low voltage (230V) networks of Eindhoven and a part of Veldhoven and is responsible for the operation and maintenance of these networks. Most of the network operators inView problem details


Building a Mountain in The Netherlands

- God created the world and the Dutch created the Netherlands. This old and popular expression among Dutch people could get a complete new meaning. After the polders, dikes and Delta works, the Dutch may have a new flagship: the Dutch mountain. The idea started as a column by journalist and former professional cyclist Thijs Zonneveld.View problem details


Fog detection from camera images

18-05-2016 - KNMI products and services rely heavily on observations. Besides increasing amounts of data from traditional sources (such as observation networks), use of open data, crowd sourced data and the Internet of Things (IoT) is rapidly emerging.  To deploy these sources of data optimally, the KNMI DataLab has been established. Data‐driven innovations that arise from public‐privateView problem details


Effective Water Storage as Flood Protection

- Effectief water bergen: De mogelijkheden van Rijnstrangen als retentiegebied voor bescherming tegen overstromingen. De Nederlandse dijken zijn gedimensioneerd op een bepaalde afvoer die (statistisch gezien) eens in de 1250 jaar voorkomt. Dat wil zeggen dat hogere afvoeren tot overstromingen kunnen leiden, maar dat lagere afvoeren veilig (dat wil zeggen zonder overstromingen) via de rivieren afgevoerdView problem details


The random disc thrower problem

- About the company: Philips Research is a global organization that helps Philips introduce meaningful innovations that improve people’s lives. We provide technology options in the area of health and well-being for both developed and emerging markets. Positioned at the front-end of the innovation process, we work on everything from spotting trends and ideation to proofView problem details


Stress fields inside of a neck for more accurate crash analysis

- Background: As a material (typically, a metal) is stretched, it can reach a point where all of the strain (deformation) is concentrated in just one area. For example, notice in the figure below how the material has become very narrow across a short length in the specimen which was initially cylindrical. This condition is calledView problem details


Oxygen transport in germinating seeds

- Seed germination in most seeds depends on the availability of oxygen. Living seeds start respiration upon imbibitions and respiration accelerates at the moment the germination really commences. The availability of oxygen to the embryo in the seed depends on the oxygen concentration around the seed, the respiration rate of the cells (in the embryo) andView problem details


Estimates on Returnable Packaging Material

- Background Heineken Global Logistics is our international supply chain knowledge centre, located in Zoeterwoude, the Netherlands. The Corporate Distribution & Logistics Department (CDL) delivers a significant contribution to the development of the Heineken business worldwide through business improvement projects, knowledge development initiatives, and policy making in the area of distribution & logistics. One of theView problem details


Coffee market volatility

- COFFEE is a tropical product, produced in over 50 developing countries. It makes an important contribution to socio-economic development and poverty alleviation and is of exceptional importance to exporting countries, some of which rely on coffee for over half their export earnings. For the 25 million smallholder farmers and their families who produce 80% ofView problem details


Energy-efficient Railway Timetabling

17-05-2016 - Environmental and economic considerations urge companies to seek for better, more e-cient ways of using the available resources. Energy is one of these resources, and railway systems are large consumers of electricity, indeed. Even the slightest improvement in the energy consumption of trains can lead to very visible eects, helping to reduce CO2 emissions and to improve theView problem details


Nonlinear cochlear mechanics

- It is perhaps astonishing that in spite of the advances in medical imaging and other research techniques, the possibilities of visualizing damage to the human hearing system are very limited. Although there is a vast range of audiological tests that measure the effect of damage, pinpointing what is causing these effects is often impossible. ThisView problem details


How useful are citizen observatories for improving water system assessments?

- The old city centre of Delft is sensitive to both pluvial and fluvial flooding, especially specific areas in the eastern part of the city centre. This includes surcharging of sewers and flooding of streets and buildings due to storm events, overflowing of canals and high groundwater levels. In order to reduce flooding impacts, the canalsView problem details


A statistical tool for water quality monitoring

- WLN Since 30 years WLN safeguards the quality of drinking water in Groningen and Drente. By using chemical, biological and technological research protects the quality of the drinking water that water company Groningen and water transportation company Drente provide. Quality control is essential for WLN. Background Measuring the quality of drinking water is WLN’s core business. AView problem details



- HZPC (www.hzpc.nl) is the world leading developer and seller of high quality seed potatoes. It is a Dutch company with offices in Metslawier and Joure that operates internationally and that employs over 230 people. To serve its customers better, it also performs research in the growth and processing of its potato varieties. This project isView problem details


Project description Statistics Netherlands

- The Nationale Databank Wegverkeergegevens (NDW), a database for traffic data, contains the counts of more than 14,000 traffic loops, that are to be found in the Dutch system of motorways and provincial roads. During a day it is analysed how many vehicles of which type pass through these loops each minute. Each day this givesView problem details


Chilling on the chicken express

10-05-2016 - System information In a processing line products hang, on a constant pitch, in a shackle, the shackle is attached to a chain by means of a trolley, on the other side the trolley has wheels that run of a profile. The assembly is called the overhead conveyor. The endless chain is running whole production dayView problem details


Forecasting Financial Scenarios using Expert Opinions

- 1   About Ortec Finance Ortec Finance is company of about 200 employees and its two main offices are located in Rotterdam and Amsterdam. The central mission of Ortec Finance is: improving financial decision making and monitoring by providing understanding, transparency and control through a combination of market knowledge, mathematical models and Information Technology (IT). PensionView problem details


Predicting Early Bulking in Potatoes

- Tuber bulking is the 4th growth stage in the development of potato. Tuber cells expand with the accumulation of water, nutrients and carbohydrates. Tubers become the dominant site for deposition of carbohydrates and mobile inorganic nutrients. In breeding we are looking for early bulking varieties (to be able to harvest most kg in desirable sizeView problem details


Optimal cutting strategies for flowers

- Dümmen Orange  proposed a problem about modelling plant growth and future demand in order to reduce redundancies.


System parameter identification in numerical simulations

04-05-2016 - A common problem in numerical simulations is finding the correct parameter values of a mathematical model. An typical example from MARIN practice is the simulation of a ship manoeuvre, like a zig-zag or a turning circle (Figure 1), where the result is compared with the outcome of an experiment. The forces acting on the shipView problem details


Power Line Route Optimisation in a Finite Spatial Grid

- Building new infrastructure such as transmission lines, roads, rail, etc. is always a source of controversy. High voltage transmission lines blight the landscape they are constructed on, bringing social, environmental and economic detriment to the areas they run through, equally they form the fabric of modern infrastructure enabling efficient transfer of power across the country.View problem details

Power grid

Accurate dose delivery for radiation therapy: adapting treatment to daily anatomy

06-04-2016 - For radiation oncology we treat patients with head and neck tumours over the course of 6-7 weeks. This treatment is usually based on one CT scan prior to treatment. We use that as an input for dose calculations in the patient based on a collapsed cone superposition algorithm. To optimise the dose distribution we useView problem details


Mobility profiling from Smartphone sensor data: confidently know how people travel

02-03-2016 - Our SWI problem formulation focusses on advancing the quality of our data derivation. Mobidot infers the route, role,objective and mode of transportation from Smartphone data. Smartphones possess a variety of sensors, including GPS, mobile telephone (4G) and wi-fi signals, accelerometer-based mode, etc. that can be used to determine the motion and position of the user,View problem details


Synchronizing numerical models of the atmosphere to improve weather and climate predictions

- Systems as diverse as clocks, singing crickets, cardiac pacemakers, firing neurons and applauding audiences exhibit a tendency to operate in synchrony. The phenomenon that dynamical systems synchronise their behaviour by some form of information exchange is known as synchronisation. In recent years, the concept of synchronisation is being applied in weather and climate research. ObservedView problem details


Statistical modelling of mechanical bearing life testing

24-02-2016 - The goal is to model and optimize bearing life testing time under constraints. The constraints are from various kinds: Number of available test machines (each machine has 2 test positions): Number of life tests to be run: Statistical distribution assumed for individual bearing life: Weibull (,) Assessed precision: expected maximum ratio between confidence bounds onView problem details


Patient Adaptive Compressed Sensing

21-02-2016 - The Problem The sampling density function in Compressed Sensing can best be optimized once the -space density is known for the object under investigation. This is characterized by an MRI scan (fast pre-acquired data set), from which the -space extent is estimated by a Fourier Transform. In addition, the data is acquired with multiple, spatially-localized,View problem details