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Hajnal I.,BUTE
Procedia Engineering | Year: 2015

One of the most apparent signs of the international real estate crisis is the many unfinished construction investments. The various states and professional organizations are attempting to mitigate investment risks with regulations and methodology instructions, and, thus inspiring new confidence, to kick-start financing, which is the engine driving the real estate market. New methods and approaches are necessary in the area of real estate appraisal also, to ensure that the market value of works in progress could be accurately determined at all times, thereby facilitating the management of risks and reinforcing the confidence of the investors. The author of the article reviews and evaluates the methods with which the value of works in progress can be estimated well, and which can replace the static, simplistic approach currently used by appraisers. While comparative methodology is not suitable to tackle the problem, as the first practical step, in the net replacement cost based valuation approach the Market Value of the land, as value-forming factor, must continuously be examined. The income-based calculation approach can easily be made suitable for the determination of the Market Value of works in progress. © 2015 The Authors. Published by Elsevier Ltd.

Devecseri G.,BUTE
Periodica Polytechnica: Civil Engineering | Year: 2010

Asphalt is defined as a mixture of inert mineral matter, such as aggregate, mineral filler and bituminous binder in predeterminated portions. One of the most important properties of asphalt mixtures is the bitumen content. The most preferred way of asphalt binder analysis is extraction (with tricloroethylene). Because of environmental reasons extraction should be replaced with more environment friendly solution, this could be heating. But high temperatures can cause changes in the physical properties of mineral aggregates that are commonly used in asphalt mixtures causing faults in the results of the binder analysis. Eight different types (five andesites, one basalt, two dolomites) of Hungarian rocks have been tested in laboratory conditions to analyse the effect of heat on asphalt aggregates. 11/16mm fractions were heated at 480°C in an ignition furnace. The weight losses and grain distributions were recorded and compared. The physical parameters have shown that aggregates behave differently after burning on high temperature. As an additional result coloures and colour differences of aggregates were also observed after heating. © Periodica Polytechnica 2010.

Szabo Z.,HAS BUTE Research Group on Dynamics of Machines and Vehicles | Zelei A.,HAS BUTE Research Group on Dynamics of Machines and Vehicles | Stepan G.,BUTE
Periodica Polytechnica, Mechanical Engineering | Year: 2012

In this paper we investigated the dynamics of a thin, flat plate placed in potential planar flow and attached by springs to the wall. Furthermore, the centre of gravity of the plate was assumed to move only perpendicular to the direction of the flow. Thus, a two-degree-of-freedom oscillatory system was analysed, whose natural frequencies depend on the flow velocity. The equations of motion were derived for two cases: first, the flow forces acting on the plate were determined using a quasisteady approach; in the second case, we used the formulas derived by Theodorsen assuming unsteady potential flow. Finally, we obtained and compared the stability charts for the two cases. © Periodica Polytechnica 2012.

Tettamanti T.,BUTE | Varga I.,Hungarian Academy of Sciences
Periodica Polytechnica: Civil Engineering | Year: 2010

The paper investigates a distributed control system scheme for urban road traffic management. The control algorithm is based on model predictive control (MPC) involving Jacobi iteration algorithm to solve constrained and nonlinear programming problem. The signal controllers of traffic network constitute a network of computers. They can distribute their computation realizing an efficient traffic control without any central management. However the optimal control inputs can be also calculated by a single traffic controller if the traffic network contains few intersections. The control aim is to relieve traffic congestion, reduce travel time and improve homogenous traffic flow in urban traffic area using distributed control architecture. The MPC based control strategy can be implemented in any urban transportation network but adequate measurement system and modern traffic controllers are needed. Theory, realization possibilities and simulation of the control method are also presented. The simulation results show that the system is able to ameliorate the network efficiency and reduce travel time. The distributed MPC based traffic control strategy proves the effectiveness by realizing a dependable control operation and creating optimal flow in the network subjected to control input constraints. © Periodica Polytechnica 2010.

Jakab G.,BUTE | Dunai L.,BUTE
Periodica Polytechnica: Civil Engineering | Year: 2010

In this paper results of an ongoing research on cold-formed C-section members are presented. The research aims the development of design methods for structural arrangements directly not covered by the standard, based on laboratory tests and numerical modelling. In the paper laboratory tests on C-section compression members are presented: arrangement, behaviour modes and load-bearing capacities. The behaviour of the specimens as well as the effect of the non-rigid end support provided by the self-drilling screws used to introduce load in the specimens are discussed. A numerical model capable of geometrically and materially nonlinear, imperfect analysis to reproduce the tests is introduced with a focus on the modelling of the connector elements and imperfections. An approach to model selfdrilling screws and equivalent geometrical imperfections is presented; the applicability of the model is shown. It is shown, that screw stiffness and geometrical imperfections both influence the stiffness of the models. The calibration of the model is carried out using the results of the experimental tests introduced previously; the results of these virtual experiments are presented. © Periodica Polytechnica 2010.

Farkas C.,BUTE | Dan A.,BUTE
Proceedings of International Conference on Harmonics and Quality of Power, ICHQP | Year: 2014

Nowadays, the ITIC curve is commonly used for evaluating voltage dips' severity. However, this curve may not catch equipment sensitivity well enough and it certainly lacks the information about the probability of whether any equipment is indeed switched on or not. In this paper we present a novel voltage dip severity evaluation method based on the lost voltage-time area of the dip and also give detailed insight into the generalization of this method based on fuzzy logic. To compare the different methods used in the industry, the ones found in the literature and ours with each other, a voltage dip evaluator program was written in MATLAB and the methods were tested against each other by using voltage dip measurement data received from the local DSO. The probability of whether any equipment is switched on or not is also investigated by using a so-called on-period curve that was determined by taking average household consumption data into consideration. © 2014 IEEE.

Dudas A.,BUTE | Farkas L.,Aquaseal Ltd
Advanced Materials Research | Year: 2014

Covering soil layer significantly reduces the heat loss of earth-sheltered building elements. Quantity of heat loss is highly influenced by the thickness of soil on examined building constructions. Based on the above mentioned facts an earth-sheltered sample building was designed. Ecological designing principles (recycled building materials and passive solar designing rules) were taken into consideration during planning of examined residential house. The building structures are general solutions, the earth-sheltered characteristic manifested by soil-covered elevations and green roof. The detailed energetic calculations are based on the linear heat transmission coefficient, which serves as a numerical definition of the heat bridge effect. Linear heat transmission coefficients were calculated as simulational results that can be derived from the finite element modelling of structural intersections. Detailed building simulations represent the advantages of soil covering. Hygrothermal analysis of building constructions based on their thermal simulations is essential. Due to the intensified waterproofing of earth-sheltered structures vapour diffusion is considerably reduced. At the same time environmentally conscious design prefers diffusion open orders of layers. Hygrothermal calculations of different waterproofing materials can categorise the environmental friendly solution of the protection. © (2014) Trans Tech Publications, Switzerland.

Currently, banks and other financing institutions ask for detailed project documentation in order to finance major building projects. Among other requirements, continuous valuation reports are to be provided by investors under the term of building works to prove current Market Value of the project. There is no scientific model for work-in-progress valuation, so appraisers are forced to use subjective judgments'. A credible and objective valuation method should help to minimize banking risk and, as a result, to increase lending activities. In the scientific literature, the fuzzy logic concept has been suggested to utilize for valuation purposes, but until now, it has not been not investigated for work-in-progress situations. Under the term of building, non-defined ("fuzzy") variables are usable and appropriate to predict the future. In this article, the author will describe and present a valuation model, which - in conjunction with automated project management tool - gives the best estimation of the actual Market Value of the project. The proposed model is based on Discounted Cash Flow (DCF) analysis. The article will also cover a case study to demonstrate the strengths of the model. © 2014 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.

Korody A.,BUTE | Vukoszavlyev Z.,BUTE
Epites-Epiteszettudomany | Year: 2014

The paper analyses the role of building rehabilitations based on the three pillars of sustainability: environmental consciousness, economic sustainability and social responsibility; to verify that all these aspects of sustainable development are accentuated in the rehabilitation of historic buildings. Beyond these aspects the study emphasizes the particular criteria of social sustainability highlighting the significance of contemporary use and conversion of built heritage. In the issue of historical continuity-local identity the tradition is displayed as a determinative element of the image of the local community. Related to the search for local identity the continuity of built heritage may be dominant for a population-especially in Central Europe where because of the specific political background the appearance of modernism equaled a cultural rupture. Exploring the question of urban continuity-fitting it can be established that built heritage preserved by current usage enriches the city with connotational contents providing reference points in space and time for the local community. The third subtopic, the issue of functional continuity-functional change investigates the idea of integrated monument protection, emphasizing the importance of continuous usage of the heritage that is elemental for the sustainability of a monument. The examples presented in the paper, the high-quality, well-functioning projects from the last 10 years of Central European architecture justify the raison d'etre of building rehabilitations.

The aim of this paper is to analyse the influence of the 'emblematic' public buildings of the state socialist era2 on the development of urban centres through examples of Hungarian rural towns. As these buildings of special importance were built typically in central areas, their relationship with the already existing historic centres is an important question.This paper aims to focus on three important contextual layers which represent significant dimensions of the urban structure (urban corpus context, urban fabric context, urban design context).This multi-layer context analysis can be considered as a new and efficient method. It can be adapted very well to analyse environmental relationships of various developments, such as housing estates or city centres.

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