In the present study, the time series encompassing the years 1950-2011 of commercial landings from the Caspian Sea were analyzed using min/max autocorrelation factor analysis (MAFA) and dynamic factor analysis (DFA). These aim was to identify trends and explore the relationships between the response variables (annual landings of 10 species/groups such as kilkas, kutum, common carp, pike perch, ...

The Pleistocene was characterized by worldwide shifts in community compositions. Some of these shifts were a result of changes in fire regimes, which influenced the distribution of species belonging to fire-dependent communities. We studied an endangered juniper-oak shrubland specialist, the black-capped vireo (Vireo atricapilla). This species was locally extirpated in parts of Texas and Oklaho...

How is value created in an online community (OC) over time? We explored this question through a longitudinal field study of an OC in the healthcare arena. We found that multiple kinds of value were produced and changed over time as different participants engaged with the OC and its evolving technology in various ways. To explain our findings, we theorize OC value as performed through the ongoin...

Product Lifecycle Management (PLM) has been considered as an essential concept for improving the product competitive ability in manufacturing enterprises. The PLM solution aims at providing a shared platform for facilitating the management of the knowledge related to any product development process in or across enterprises. However, facing with different standards, enterprise systems and stakeh...

As buildings become more complex, it becomes more difficult to manage and operate them effectively. The holistic management and maintenance of facilities is a multi-domain problem encompassing financial accounting, building maintenance, human resources, asset management and code compliance, affecting different stakeholders in different ways. One technique, called scenario modelling, customises ...

This paper presents a design project for undergraduate systems engineering students in which Armed Unmanned Aerial Vehicles (AUAV’s) are designed, using the systems engineering design process taught at the United States Military Academy, and tested using constructive and virtual simulation. These results are compared to theoretical results obtained through applying Lanchester analysis. Students...