Production rates for various activities and overall construction project duration are significantly influenced by crew formation. Crews are composed of available renewable resources. Construction companies tend to reduce the number of permanent employees, which reduces fixed costs, but at the same time limits production capacity. Therefore, construction project planning must be carried out by means of scheduling methods which allow for resource constrains. Authors create a mathematical model for optimized scheduling of linear construction projects with consideration of resources and work continuity constraints. Proposed approach enables user to select optimal crew formation under limited resource supply. This minimizes project duration and improves renewable resource utilization in construction linear projects. This paper presents mixed integer linear programming to model this problem and uses a case study to illustrate it.
The basic element of a project organizing construction works is a schedule. The preparation of the data necessary to specify the timings of the construction completion as indicated in the schedule involves information that is uncertain and hard to quantify. The article presents the methods of building a schedule which includes a fuzzy amount of labour, time standards and number of workers. The proposed procedure allows determining the real deadline for project completion, taking into account variable factors affecting the duration of the individual works.
Bogusław Wolniewicz created an original formal system based on his considerations on the ontology and semantics embedded in Wittgenstein’s Tractatus. His system – called by Wolniewicz ‘ontology of situations’ – can be complemented by a philosophical interpretation. In this article I identify the implicit and intuitive underpinnings of the system, its formal content and its philosophical implications. I also indicate a few applications of the system to axiology and logical hermeneutics.
The chuch dedicated to The Holy Spirit, erected in Wrocław, in housing estate Huby, was created during the communist period, hence it was very difficult to design it, and to build. But it was also the period close to the collapse of this regime, so communist leaders were pressed to be more tolerant towards human rights than before, including the religious freedom and towards building new churches. The author of the church mentioned – a very active political oppositionist – when designing the strongly innovative church building, was simultaneously forced by fate to fight formal difficulties caused by oppressive rulers. Author makes the reader closer to those complicated double troubles: artistic, parallel to the political. Finally, the church building was happily completed, then became widely popular and accepted.