Gupta, Rahimi and Yang recently proposed a novel recovery algorithm for distributed systems in which checkpoints are taken asynchronously [1]. A checkpoint taken by a process is a snapshot of its local state, stored in a stable storage, so that the process can roll back to it, if this becomes necessary. The start of a process is also one of its checkpoints. Asynchronous checkpointing means that...

In the first part of this paper, we derive a source model describing the relationship between bits, distortion, and quantization step size for transform coders. Based on this source model, a variable frame rate coding algorithm is developed. The basic idea is to select a proper picture frame rate to ensure a minimum picture quality for every frame. Because our source model can predict approxima...

Study on the Response Time of Direct Injection Systems for Variable Rate Application of Herbicides Progress in the technology of weed detection using cameras combined with image processing requires improvements in spray technology. Spraying systems of current design distribute herbicides uniformly across the field. Applying the chemical agents only at locations with weeds according to the indic...

A shaper is a system that stores incoming bits in a bu er and delivers them as early as possible, while forcing the output to be constrained with a given arrival curve. A shaper is time invariant if the tra c constraint is de ned by a xed arrival curve; it is time varying if the condition on the output is given by a time varying tra c contract. This occurs, for example, with renegotiable variab...

In many communication applications, sources generate data at a variable rate. This variation can be captured by a two-level model. At a larger time scale, the source alternates between a nite number of models at the higher level, while each model represents the local uctuation at the smaller time scale. Typically the data goes through a lossy compression at the encoder, and then is entered into...

Field tests were conducted to determine if differences in response to nematicide application (i.e., root-knot nematode (RKN) populations, cotton yield, and profitability) occurred among RKN management zones (MZ). The MZ were delineated using fuzzy clustering of five terrain (TR) and edaphic (ED) field features related to soil texture: apparent soil electrical conductivity shallow (ECa-shallow) ...

Variable rate application of fertilizer has the potential to improve nutrient use efficiency, improve economic returns, and reduce negative environmental impacts. The objective of this study was to evaluate the variable rate application of potassium fertilizer to soybean crop in a no-till system. The study was conducted on a 13-ha soybean grain field in Carambeí, State of Paraná, Brazil in a Ty...

and 10% in corn (Hilton et al., 1994). Fertilizer N losses due to surface runoff range between 1 and 13% In 2001, N fertilizer prices nearly doubled as a result of increased (Blevins et al., 1996; Chichester and Richardson, 1992). natural gas prices. This was further troubling when considering that the world N use efficiency (NUE) in cereal grain production averages Urea fertilizers applied to ...