This paper is concerned with an improved network model in acoustical application to petroleum logging and seismic exploration. Utilizing acoustic-electric analogue, we report in this paper a newly developed acoustic-logging network model. Important relationships amongst various physical factors are established, i.e. driving-voltage signal, electric-acoustic conversion of source-transducer, acou...

This work presents a novel approach to support multiprocessor scheduling at userlevel. We propose to use system instrumentation and event logging to obtain runtime information relevant for scheduling, from different system sources such as the hardware, operating system components, or application programs. We instrument the system components with event log handlers that record scheduling data in...

Ecological communities typically change along gradients of human impact, although it is difficult to estimate the footprint of impacts for diffuse threats such as pollution. We developed a joint model (i.e., one that includes multiple species and their interactions with each other and environmental covariates) of benthic habitats on lagoonal coral reefs and used it to infer change in benthic co...

Event logging on mobile phones is interesting for e.g. diary keeping. We present a logging service which – automatically and in the background on Symbian based mobile phones – logs events originated by user interactivities with mobile phones. Context information that can be obtained by the phones themselves is logged as well. The service offers direct access to the logged events, so that data c...

The logging industry remains one of the most hazardous in the nation. Despite more stringent safety regulations and improvements in equipment safety features, the rate of logging fatalities has decreased at a much lower rate than the decrease in the rate of illnesses and injuries in the same occupation. The objective of this research was to identify and assess the hazards associated with loggin...

Peatlands are very problematic from the bearing capacity point of view. Therefore, logging activities on peatlands in Finland are mainly carried out during the coldest weeks in winter time. More intensive utilisation of peatland forests requires logging activities to be increasingly carried out during unfrozen conditions. Multiple passages of a harvester and a loaded forwarder used for the tran...

In this paper, we propose a new, efficient logging protocol, called lazy logging, and a fast crash recovery protocol, called the prefetch-based crash recovery (PCR), for software distributed shared memory (SDSM). Our lazy logging protocol minimizes failure-free overhead by logging only data indispensable for correct recovery, while our PCR protocol reduces the recovery time by prefetching data ...

Over the last two centuries, logging has caused major, but unquantified, compositional and structural changes in the southern portion of the North American boreal forest. In this study, we used a series of old forest inventory maps coupled with a new dendrochronological approach for analyzing timber floating histories in order to document the long-term transformation (1820–2000) of a southern b...

This paper presents a simple and effective method to reduce the size of log data for recovery in main memory databases. Fuzzy checkpointing is known to be very efficient in main memory databases due to asynchronous backup activities. By this feature, most recovery works in the past have used only physical logging schemes. Since the size of physical log records is quite large, physical logging s...

Fault-tolerance techniques based on checkpointing and message logging have been increasingly used in real-world applications to reduce service down-time. Most industrial applications have chosen pessimistic logging because it allows fast and localized recovery. The price that they must pay, however, is the high failure-free overhead. In this paper, we introduce the concept of K-optimistic loggi...