A Mathematical Model for Simplifying Representations of Objects in a Geographic Information System

The study of operations on representations of objects is well documented in the realm of spatial engineering. However, the mathematical structure and formal proof of these operational phenomena are not thoroughly explored. Other works have often focused on query-based models that seek to order classes and instances of objects in the form of semantic hierarchies or graphs. In some models, nodes of graphs represent objects and are connected by edges that represent different types of coarsening operators. This work, however, studies how the coarsening operator simplification can manipulate partitions of finite sets, independent from objects and their attributes. Partitions that are simplified first have a collection of elements filtered (removed), and then the remaining partition is amalgamated (some sub-collections are unified). Simplification has many interesting mathematical properties. A finite composition of simplifications can also be accomplished with some single simplification. Also, if one partition is a simplification of the other, the simplified partition is defined to be less than the other partition according to the simp relation. This relation is shown to be a partial-order relation based on simplification. Collections of partitions can not only be proven to have a partial- order structure, but also have a lattice structure and are complete. In regard to a geographic information system (GIs), partitions related to subsets of attribute domains for objects are called views. Objects belong to different views based whether or not their attribute values lie in the underlying view domain. Given a particular view, objects with their attribute n-tuple codings contained in the view are part of the actualization set on views, and objects are labeled according to the particular subset of the view in which their coding lies. Though the scope of the work does not mainly focus on queries related directly to geographic objects, it provides verification for the existence of particular views in a system with this underlying structure. Given a finite attribute domain, one can say with mathematical certainty that different views of objects are partially ordered by simplification, and every collection of views has a greatest lower bound and least upper bound, which provides the validity for exploring queries in this regard

Cutting cost in service systems: Are you running with scissors?

A rigorous link between the domains of cost estimation, systems theory and accident investigation reveals fundamental epistemological limitations of commonly employed cost models when dealing with the characteristics of systems, particularly service systems, which may hinder the ability to take appropriate action for cost reductions.Key points:1.The ability to take action, in particular related to cost reductions in service systems, is strongly influenced by the understanding (epistemological assumptions) underlying a decision-support tool, in this case a cost estimate.2.There is a conflict in the underlying epistemological assumptions about what is and can be known in such a socio-technical system as a service system.3.A managerial perspective of cost estimation which neglects the essential characteristics of service systems may drive behaviour which is locally optimised but creates tension or failure at the system level.4.Cost cutting decisions that are based on a flawed understanding of the situation can lead to counter-intuitive outcomes for organisations; hence practical guidance is needed to help managers consciously consider the underlying epistemological assumptions in a given situation

Occupational health and safety management in organizations: A review

In examining the research literature on occupational health and safety (OHS), this paper argues that the growth in the number of specialists in OHS has resulted in an emphasis on policy and practice away from more scholastic concerns previously addressed by academics in the disciplines of psychology and sociology. A hiatus has occurred, and this is evidenced by the general absence of studies in management, even though OHS is increasingly seen as a key operational and strategic concern of business organizations. The authors call for OHS to be placed firmly on the research agenda of management scholars, and advocate the need for greater conceptual development, empirical study and theoretical reflection to complement existing pragmatic concerns of OHS specialists. In this review, the contributions of psychology, sociology, industrial relations and management studies are assessed, and five categories of specialist OHS literature are analysed, namely: prescriptive; systematic OHS management; success based; error and disaster based; and culture, climate and high-reliability studies. The conceptual and methodological limitations of this specialist focus are discussed, and future research opportunities are highlighted, for which the authors argue that management scholars embrace a range of methodological approaches. The authors advocate the value of extended case studies which examine OHS in context and over time in particular workplace settings. There remains considerable scope to develop this field further and, in conclusion, particular attention is drawn to the value of processoriented contextual approaches for understanding OHS management in organizations

Fundamental and technical analysis of the stock ČEZ

This graduation theses provides on the basis of an analysis fundamental and technical investment recommendation regarding shares of ČEZ. In determining the internal value of shares are used dividend discount models, profit models and FCFE model. By comparing this value with the current share price is determined whether the stock is profitable investment or not. Technical analysis with utilization graphical methods and technical indicators are able to predict when the market occurs a situation in which an advantageous sale or purchase of share is