Jeff Millstein

• PhD
• Consultant at Commonwealth Informatics, Inc.

In our burgeoning world of ubiquitous sensors and affordable data storage, records of timestamped events are being produced across nearly every domain of personal and professional computing. The resulting data surge has created an overarching need to search these records for meaningful patterns of events. This paper reports on a two-part user study...

Fig. 1: The EventFlow display including the control panel and legend (left), the aggregated record display (middle), and the individual record display (right). Abstract— Our work on searching point-based event sequences with the Align, Rank, Filter, and Summary concepts produced a powerful tool (Lifelines2) that is being applied in an increasing se...

This problem of how to quantify the worst‐case or extreme misapplication that could occur for a particular backpack sprayer scenario was studied by considering two disparate approaches. First, a highly conservative position is taken by assuming that all errors are dependent on one another and that no single error can cancel another. In this case, e...

The propagation of non‐statistical measurement error was studied in four simple generic pesticide calibration scenarios. Measurement error was represented using intervals, and error propagation was studied by computing with these intervals and measuring the distance between the interval result and result under no uncertainty. Intervals were generat...

The microcomputer program RAMAS 3 developed for EPRI, has been used to model the intrinsic natural variability of seven important fish species: cod, Atlantic herring, yellowtail flounder, haddock, striped bass, American shad and white perch. Demographic data used to construct age-based population models included information on spawning biology, lon...

The monoterpene response of phloem and sapwood of individual pines belonging to 3 species (Pinus contorta, Pinus ponderosa and Pinus monticola) to inoculation with Ophiostoma clavigerum and injection with chitosan, a proteinase inhibitor-inducing factor and a control buffer, was investigated quantitatively and qualitatively. The total quantity of m...

The requirement of host tree death for successful reproduction by some bark beetles (Coleoptera: Scolytidae) has placed strong selective pressures on conifers for rapidly induced, complex defensive systems. Conversely, the ability of bark beetles to engage in cooperative attacks mediated by aggregation pheromones and their associations with phytopa...

Chaotic dynamics emerge when positive/negative feedback systems are dominated much of the time by positive feedback growth processes. Although all ecological systems contain the seeds of chaos (positive feedback), empirical evidence and evolutionary/ecological reasoning support the view that ecosystems do not normally behave chaotically. They may,...

On theoretical grounds, ecological systems are argued not to be chaotic unless induced to be so by human intervention.

The phenology of Erynia epizootic development among larval alfalfa weevil, Hypera postica (Gyllenhal), populations in central Kentucky during 1979 through 1982 is described. Critical biological and physical factors governing initiation, progression, and termination of the epizootic under field conditions are identified. The first incidence of Eryni...

Erynia sp. conidiation on larval alfalfa weevil, Hypera postica, was studied in the laboratory under constant and fluctuating saturation deficits. At optimum conditions of saturated still air (0.0 mm of Hg, 100% relative humidity [RH]), the fungus would discharge conidia for up to 50 h. Peak conidial discharge occurred ca. 3 h after exposure to sat...

Weight change of alfalfa weevil larvae infected with an Erynia fungus was compared with that of noninfected larvae at different saturation deficits. As expected, the developing fungus was generally sensitive to changes in atmospheric water concentration. Weight loss of infected larvae decreased as saturation deficit levels decreased. Typically, per...

The association between conidial discharge (showering) and relative humidity in Eeynia sp. infecting larval alfalfa weevils was studied under field conditions during an 11-day epizootic. The fungus was observed to shower when relative humidities in the alfalfa canopy exceeded 91% for ca. 3 h. The showering period had a mean duration of 5 to 10 min....

In our burgeoning world of ubiquitous sensors and afford-able data storage, records of timestamped events are being produced across nearly every domain of personal and profes-sional computing. This data ranges from government-funded medical databases, to the meticulously tabulated comings and goings of obsessive self-trackers. Across all domains, h...