Disk logging is a fundamental building block for faulttolerance system design because it captures a persistent snapshot of critical system state for subsequent recovery in the occurrence of failures. Logging typically is required to be synchronous to ensure absolute recoverability. Therefore speeding up synchronous disk write is critical to those fault tolerance systems that are based on disk l...

In an agent system, the ability to handle problems and recover from them is important in sustaining stability and providing robustness. We claim that execution logging is essential to support agent system robustness, and that agents should have architectural-level support for logging and recovery methods. We describe an infrastructure-level, default methodology for agent problem-handling, based...

Causal message logging is an efficient approach for tolerating failures of processes in distributed systems because it has the advantages of both pessimistic and optimistic message logging approach. However, traditional causal message logging protocols prevent live processes from executing continuously their computation and require some synchronous logging to the stable storage during recovery....

We propose a framework with endogenous allocation of land between agricultural production, sustainable forest management, and unsustainable forest exploitation in the form of illegal logging to explore deforestation and agricultural and timber supplies when property rights are insecure. Uncertainty over property rights arises through risk of confiscation on sustainably-managed forest land, and ...

VANCLAY, J.K. 1989. Modelling selection harvesting in tropical rain forests. Long term yield estimates for natural forests require a harvesting model to enable future yields to be estimated reliably. The model should predict the felled stems, the proportion of these which are merchantable, and any damage to the residual stand. Regression analyses was used to develop a model of current logging p...

In this paper, we present two fault-tolerant protocols for mobile computing systems; a causal message logging protocol and a receiver-based pessimistic message logging protocol for tolerating failures of mobile hosts (MHs) and mobile support stations (MSSs) respectively. The systems raise several constraints such as limited life of battery power, mobility and disconnection of hosts and lack of ...

Hot dry rocks, as clean and abundant sources of new energy, are crucial in the restructuring energy. Predicting temperature field hot rocks is great significance for trapping target areas rocks. How to use limited logging data predict within a work area difficulty faced rock exploration. We propose method (using seismic inversion results). The relationship between porosity transverse wave veloc...

We discuss three approaches to seismic interferometry and compare their underlying assumptions. In the first approach the reflection response is reconstructed by cross-correlating the responses of many uncorrelated noise sources. In the second approach a depth image is obtained from the response of a single source, recorded by many receivers. In the third approach the Green’s function is recons...

Time-lapse (4D) seismic data sets have proven to be extremely useful for reservoir monitoring. Seismic-derived impedance estimates are commonly used as a 4D attribute to constrain updates to reservoir fluid flow models. However, 4D seismic estimates of P-wave impedance can contain significant errors associated with the effects of seismic noise and the inherent instability of inverse methods. Th...