Articles tagged with Mathematical Modeling
Researchers from Virginia Tech have validated a mathematical model of cell division using experiments on frog egg extracts. They found that the control system is bi-stable and hysteretic, requiring specific levels of cyclin to regulate mitosis.
The Lancet Oncology editorial discusses the EPA's 10-year report on diesel exhaust fumes' toxic effects, emphasizing public health implications. The article also reviews mathematical models identifying breast cancer risk factors and explores chemoprevention strategies.
The model simulates the mail-borne anthrax outbreak in the US, demonstrating that six original letters contaminated up to 5,000 other pieces of mail, primarily affecting elderly recipients. The analysis highlights the greatest risk to society came from postal workers and recipients of cross-contaminated letters.
A Penn State researcher has created a model that explains why flowering plants in Norway bloom earlier after warmer winters. The study incorporates biological factors and provides insight into the ecological responses to climate change.
A team of scientists has established a formula to predict population dynamics for species more complex than single-celled organisms. Their research uses long-duration experiments and demonstrates that simple mathematical models can govern predator-prey interactions.
Researchers at Johns Hopkins Medical Institutions have identified key shapes and sizes used by the brain to build internal models of reality, enabling humans to learn and control movements. The study reveals fundamental limitations to what is learnable by the human brain, shedding light on how our brains 'think'.
A new mathematical model links El Niño cycles to cholera outbreaks, with a consistent 3.7-year frequency in both ENSO events and cholera cases. The study suggests an 11-month time lag between ENSO events and peak cholera incidence, likely due to increased sea-surface temperatures and bacteria-bearing zooplankton.
A new mathematical model developed by University of Michigan scientist Denise Kirschner shows how HIV accelerates the normal process of homing, diverting white blood cells from the bloodstream to the lymph system. This understanding is crucial for developing effective treatments and targeting therapeutic drugs.
A Cornell University computer scientist has concluded that the key to finding people in a network lies in its structure, which can provide fundamental cues for navigation. By using an "inverse square" pattern of connections, messages can travel faster and more efficiently through networks.
A new model analyzes how patient care plans, clinic profits, and drug manufacturer revenues are affected by outcome-oriented reimbursement policies. The model identifies key factors that influence the optimal treatment plan for individual patients, including initial condition, cost parameters, and insurance reimbursement guidelines.
Researchers at the University of Illinois developed a mathematical model that predicts when steel-making nozzle clogs will occur, enabling manufacturers to take action before production is halted. The model uses principles of fluid dynamics and heat transfer to simulate the steel-making process and provides accurate predictions compare...
Water vapor and clouds cause difficulties in atmospheric models due to their lumpy nature and turbulent motion, making it a 'messy problem' for modeling. Researchers aim to develop new approaches to represent these phenomena in numerical form.
A new mathematical model explains changing patterns in epidemics by analyzing historical data on measles outbreaks. The research reveals that increases or decreases in birth rates or vaccination rates cause dramatic changes in epidemic patterns.
A new model predicts that expanding potent HIV therapies will limit infections and AIDS deaths, even with increased risk behavior and drug resistance. The model shows that treating more HIV-infected men will reduce infection rates and deaths below what they would be without treatment.
A study by Washington University's Air Quality Laboratory found that rural vehicles emit between 200-300 milligrams of particulate matter per mile traveled, while urban vehicles emit between 30-40 milligrams. This measurement, known as ppvm, could help environmental agencies better address air quality challenges.
Researchers found that calculations taking longer than 26 months on current hardware are not worth starting. Instead, delaying until a more powerful computer is available can save time and resources. This strategy allows for optimal use of limited budgets for computers.
A study published in Marketing Science found that a professors' model for choosing films can improve profitability by 30-120% compared to movie exhibitors' own choices. The model, which uses operations research and quantitative techniques, recommends selecting fewer 'right' movies and running them longer.
A new study forecasts movie performance for domestic and international markets using a Bayesian model that examines information like star quality, past film performance, and screen numbers. The model provides accurate updates as sales figures come in to help plan better marketing activities.
A mathematical model of H.pylori bacteria and their human hosts reveals the key role played by adherent bacteria in colonization, as well as the dynamic relationship between host response and bacterial persistence. The model sheds light on the complex interactions between the bacteria and human immune system.
A new mathematical model suggests that annual antibiotic treatments will not be enough to eradicate trachoma in areas with high incidence rates. The model predicts that these areas, which account for only 10% of total affected regions, will experience a higher rate of blindness due to reinfection.
A form of bait and switch could actually benefit consumers, say professors, as it drives prices down and stimulates in-store promotions. However, others contest this argument, citing fraudulent practices and the need for retailer competition.
Orrin Pilkey, a Duke University geologist, argues that engineering models used to predict natural processes, such as beach erosion, are flawed and damaging to society. He proposes that beach erosion is linked to rising sea levels and that some coastal engineering measures can exacerbate erosion.
A numerical analyst developed a math model with algorithms to distribute Seattle Mariners' season tickets fairly among a group of friends. The technique uses mixed-integer programming to satisfy diverse requests and preferences, achieving 46.7% success rate in assigning top-ranked games.
Researchers developed a model to predict antiviral drug resistance in genital herpes, finding that treating the disease would prevent more cases than developing resistant strains. The study suggests using this methodology for other infectious diseases prone to resistance.
Researchers have developed a fast new way to compute three-dimensional models of internal organs and anatomical features from noisy medical images. The method, based on partial-differential equations, allows doctors to build accurate models with just a single click inside the region of interest.
Subodh Kumar's software, called sLIB, significantly speeds up the display of three-dimensional models by better than 100 to 200 times over older techniques. The program also allows designers greater control over detail levels and enables testing of user ideas.
A new coupled hydrologic model system simulates storm events and river basin response by linking atmospheric and hydrological models. The model was tested on the West Branch of the Susquehanna River basin, showing improved results with historic meteorological data compared to atmospheric predictions.
Gordon Kane highlights the importance of models in physics, citing Aristotle's flawed theory as an example. He emphasizes that scientists test multiple models against reality to determine which one is correct. The Standard Model of particle physics is a prime example, developed after decades of research and testing.
A reanalysis of international data reveals a significant decline in sperm density across the United States and Europe, with the rate of decrease varying by region. The study found an average annual decrease of 1.5 million sperm per milliliter in the US and 3.1% per year in Europe.
A new mathematical model proposes the sun's magnetic field resembles a wild cyclone rather than a tidy lawn sprinkler. The model suggests that the magnetic field lines pass through different latitudes, providing a route for low-energy particles to travel from the equator to the poles.
Researchers at Johns Hopkins University use computer models to study serious cardiac disorders and test potential treatments. By mimicking the heart's physiological functions in a highly detailed model, they aim to find medicines that can prolong the lives of millions suffering from congestive heart failure.
A mathematical model explains the scientific basis of radical heart surgery, potentially selecting suitable candidates for therapeutic removal of large heart muscle portions. The Batista procedure aims to improve cardiac function by reducing heart size and stress.
The study reveals that chemical activity within brain cells exhibits behavior characteristic of self-organized criticality, which may help identify disease processes. Researchers used modeling techniques to simulate brain networks and found a power law distribution of wave sizes and durations, adhering to the signature of self-organize...
Researchers have developed a new model that accurately predicts Dungeness crab population fluctuations, combining internal and external factors. The study provides a rare instance where a modeled understanding agrees with field data, offering insights into the elusiveness of population predictability.
Scientists model 1883 tsunami impact on English Bay and Homer Spit, predicting energy absorption at Anchor Point and flooding risk at Homer Spit. The model helps emergency planners understand risks and plan for potential landslides and tidal waves.
Researcher Robert Connelly uses tensegrities to model molecular structures like buckminsterfullerenes, which have unique geometric stability. His work provides insights into the behavior of certain-shaped molecules and could lead to a catalogue of stable tensegrity structures.
The review paper reviews powerful computational tools in studying ecology, genetics and evolution, infectious diseases and immunology. Computational biologists use models to understand the behavior of entire systems, mediated by smaller and larger scales.
A researcher has developed a mathematical tool to model trading patterns of stockbrokers by analyzing crowd behavior. This technique, known as Orchid Fractal Analysis, provides highly accurate models of how crowds behave, similar to modeling crowd control at football stadiums.