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Personal
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Research
interests: Public health, populations, infectious diseases, mathematical
models, demography, ecology, epidemiology, population genetics.
We study
populations by developing concepts of demography, epidemiology,
ecology and population genetics. In our book, How Many People
Can the Earth Support?, we examine how the interaction of natural
constraints with human choices affects carrying capacity. In other
studies, we are developing spatially explicit mathematical models
of Chagas disease transmission in Argentina, to improve interventions
and disease control. To understand ecological communities of human
and nonhuman species, we focus on food webs, flowcharts of who
eats whom. We are developing a new data structure to integrate
food webs with species abundances and body sizes. Many descriptions
of community structure can be derived as special cases of this
data structure. We analyze quantitatively age patterns of senescence-related
variables, including total and cause-specific rates of mortality,
morbidity and disability, as well as biomarkers of aging. We develop
mathematical models and statistical methods to explain observed
quantitative patterns and differentials.
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RESEARCH
PROJECTS: |
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We study populations,
and theories relevant to them. Populations exhibit phenomena that
are difficult to deduce from the characteristics of an isolated
member. For example, the prevalence of a disease is indirectly connected
to the course of disease in an individual; aging in a population
differs in causes and consequences from aging in an individual.
To develop concepts helpful for understanding populations, we study
concrete problems in demography, epidemiology, ecology, and population
genetics.
DEMOGRAPHY
How
Many People Can the Earth Support?
Aging, Morbidity & Mortality in Industrialized Societies
Spatial Distribution of the Human Population
Population Dynamics (Horiuchi,
Cohen)
EPIDEMIOLOGY
Chagas Disease
in Northwest Argentina (Cohen,
Gürtler)
ECOLOGY
Food Webs
in Rice Paddies in the Philippines
Body Sizes in Predatory and Parasitic Food Webs (Cohen,
Jonsson,
Chen)
Spectral Properties of Chaotic Population Models (Cohen,
Chen)
MATHEMATICAL
STUDIES
Entropy Inequalities
in Information Theory
Paradoxes of Congested Networks
Nonassociative Algebras: Paper, Scissors, Stone (Itoh)
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