This paper consists of three results on Frobenius categories: (1)we give sufficient conditions on when a factor category of a Frobenius category is still a Frobenius category; (2) we show that any Frobenius category is equivalent to an extension-closed exact subcategory of the Frobenius category formed by Cohen–Macaulaymodules over some additive category; this is an analogue of Gabriel–Quillen’...

This paper reviews existing population estimation methods in the GIS and remote sensing literatures. The methods can be grouped into two categories: areal interpolation methods and statistical modeling methods. Areal interpolation methods can be further separated into two categories depending on whether ancillary information is used. Statistical modeling methods can be further grouped into five...

Background: The number of interventional cardiology procedures performed has increased rapidly over the past years. While these procedures help physicians avoid using highly complicated invasive methods, it usually leads to high levels of exposure to ionizing radiation of both patients and cardiologist. The dose received by the cardiologist during interventional cardiology procedures is determi...

the shape of urban development and its impact on economic growth is one of the most important issues in urban economic literature. in accordance to the corresponding theory, economic growth and urban concentration have an inverse-u shape relation. the shape of urban development is related to how resources are spread out in existing cities of an urban system and investigated under the term of ur...

integrated urban management means adopting a holistic approach to urban management and designing appropriate mechanisms for this approach’s requirements in practice. the integration of the urban activities brings together organizational , structural and institutional activities and action in which the urban development is supported. in order to achieve integration, it is essential to identify f...