Broader categories of "usual" patterns of activity, household operation, and susceptibility factors can be considered as modifying factors for the exposure response relationship using available central-site monitoring data (Gauderman et al. 2000; Janssen et al. 2002).
These include the substudy's purpose, the population sample to include, whether personal or microenvironmental samples should be collected, the respondent burden, study feasibility, sample collection and analytic costs, temporal variation of exposure, subject activity patterns, household operation by residents, and uses in model validation and calibration.
Based on a smart home system model abstracted from the perspective of implementing users' household operations, a general domain ontology model is designed by defining the correlative concepts, and a logical data semantic fusion model is designed accordingly.
The food chain refers to the successive collection of the farming, food processing, distribution, packaging, retail, catering, household operations, waste and disposal industries, for different types of food products.
Household operations accounted for the highest energy use, whilst food processing showed the largest increase from 2002 to 2007, as both households and foods service sectors outsourced manual food preparation and cleanup activities to the manufacturing sector, which relied on energy-intensive technologies.
The SDA evaluated the effects of changes in US population, food-related budget, product mix and food system technologies, whilst the SCA provided a more in-depth analysis of the changes, in terms of the contribution of agriculture, processing, packaging, transportation, retail, food service and household operations to the aggregate change in energy flows.
One such company is LifeWorx, a year-old household services operation in Chappaqua that has a staff of about 20.
The next stage utilised systematic sampling of households in which household inventory operation was carried out in all the identified EAs between January and March 2014.
A household listing operation was carried out in selected villages to prepare the sampling frame.
A household listing operation was carried out in selected unions to prepare the sampling frame for selection of households.
Finally, as in rural areas, field enumerators undertook a household listing operation in selected blocks and a random sample of households was made.
