Summary Quite frequently one has to solve variant synthesis multicriterial selection problems in construction. These problems consist of many technical-organisational solutions interacting with each other. The solution of each problem can be made of two or more alternatives. In each step k according to j, the effectiveness criterion is selected from variants i. Using the entropy method the weights of effectiveness indices in each step are calculated. By the criterion k(1) the effectiveness of variants in each step is determined. From the row of priorities obtained the first two variants are selected and they are repeatedly calculated by the same methods. The selection of variants (branches) synthesised is made by the criterion Ωs (2). A priority row of variants is determined according to the rule that the greater value of Ωs means the best variant (3). The second algorithm is used when there are more than two variants in the steps of problem. A joint matrix between separate steps of solutions is determined. Weights of criteria for each step are determined using the entropy method. It is necessary to regulate the values of importance according the number of variants. The weights obtained by the method of entropy are multiplied by the coefficient considering the number of alternatives analysed (4). The final valuation of branch is obtained according to the formula No 5. The best synthesis result is the one, having the largest Ωs value. The values of criteria effectiveness of each step of each net program branch are summed, when priorities are determined using the same coefficients of effectiveness. The weights are summed using formula 6. It is possible to calculate the priorities of alternatives using the ideal point method. The methods mentioned above were used to solve real life construction problems.
This research represents sustainable building modernization model, which creates knowledge-based decision-making method for old public buildings refurbishment seeking to reach the best energy performance during the design stage. Despite the fast development and spreading standards, challenging research opportunities arise from process automation and BIM adaptation for existing buildings’ requirements. To aid decision-making, building simulation is widely used in the late design stages, but its application is still limited in the early stages in which design decisions have a major impact on final building performance. Building design is a multi-collaborator discipline, where architects influence design decisions, engineers, contractors, and building owners. Using digital systems and simulations this modernization method performs already expected building energy consumption in a quickest and economic way. This model is BIM-based where design and refurbishment are based on pre-built indicators, which allows assessing the building energy demand and eco-building parameters.
The paper considers the main methods employed to solve one-sided and two-sided problems of the game theory. For the one-sided problems only the method of solution “distance to the ideal point” is discussed. For the two-sided problems a distinction is made between games with rational behaviour and games against nature. The main principles of the strategies are as follows: simple min-max principle, extended min-max principle, Wald's rule, Savage criterion, Hurwicz's rule, Laplace's rule, Bayes's rule, Hodges-Lehmann rule. The questions transforming the decisionmaking matrix are considered: vectorial transformation, linear transformation, linear transformation according to Jüttler's or Stopp's method, non-linear transformation according to Peldschus. The article gives the description of a program package as well as an example of an investment variant estimation. The program LEVI 3.0 is a result of the cooperation between the VGTU and HTWK. This article provides description of a program package as well as an example of investment variant estimation to illustrate the application of methods described; efficiency problem of financial investment in construction or reconstruction in the health resort of Nida (Lithuania) is analysed.
Aim of the article: to create a prototype of an information system of an optimized site plan using virtual reality technology (VRT). The article consists of two parts. The first part: the review of the literary sources used; a comparative analysis of the existing models of the construction site plans. Second part: the description of the prototype development of the information system (the algorithm) using building information modeling (BIM), and VRT.
Summary The largest part of old towns in Lithuania are to be regenerated. Sociological evaluation made in 1998 in Vilnius showed that the main problem of the Old Town are falling buildings. Nowadays investment into real estate is evaluated according to a single criterion. That's why it is so complicated to review the whole investment process. The object under investigation is the buildings in Vilnius Old Town. Condition of building constructions was evaluated. The location of building and possibilities of building usage are being€ evaluated also. Vilnius real estate market data was collected from Vilnius general plan. Values of building at various stages of reconstruction are calculated. There are 5 different alternatives of marketing. The scheme of building marketing is presented in Fig 2. There are schedules of the reconstruction work made (Figs 3 and 4). An estimation of different alternatives of building reconstruction is calculated (Table 3). Alternatives of building regeneration were evaluated in accordance with 14 criteria: profit of the project, life-time of building, price of the maintenance, perspectives of business, comfortability of building, price of building sale, insulation, possible losses because of accidents, cost of the building acquiring and reconstruction, location of building, price of the rent, term from the building acquiring till realisation, place for car parking and appearance. Decision matrix is presented in Table 4. Rationality of alternatives was calculated using TOPSIS method. Ranking of alternatives is presented in Table 5. We suppose that multi-criteria evaluation of the investment options creates new possibilities for investors and helps to choose the best variant of the building usage.
Summary Unowned and badly managed former kolkhoz property is a national asset of the Republic of Lithuania and it must be protected and effectively used. Problems of rural buildings came to the surface due to unsuccessful reorganization of agricultural sector in Lithuania what has caused the decline of rural property. Part of the rural constructions are still existing and there is a possibility to revitalize and use them, while others have already decayed or are irreversibly decaying and threatening people's safety, negatively influencing environment, ruining landscape and forming negative public opinion about the authorities' ability to manage the country. Solution of rural property and its surrounding territory related problem requires exhaustive data. Centralized collection of rural property data was initiated. The collected information is valuable enough, presenting important juridical, technical and market facts, which allow to identify rural property. This respectively treated and generalized information will be used in further scientific research with the aim of making well-founded scientific conclusions, suggestions and recommendations which would create a base for revitalization of rural property. Revitalization of rural property includes modernization, renovation, reconstruction and/or restoration. It covers various processes related to rural property and its improvements. All these processes must be well-founded using investment calculations and evaluations of efficiency investment criteria. Logarithm of revitalization of useless rural property is shown in Fig 8. Revitalization process contains six stages: 1. Adjustment of suitability for use,2. Research of employment possibilities,3. Preparation of investment projects,4. Multicriteria decision-making of investment project,5. Evaluation of project risk,6. Realization of investment project.
The largest part of old towns in Lithuania are to be regenerated. Sociological evaluation made in 1998 in Vilnius showed that the main problem of the Old Town are falling buildings. Nowadays investment into real estate is evaluated according to a single criterion. That's why it is so complicated to review the whole investment process. The object under investigation is the buildings in Vilnius Old Town. Condition of building constructions was evaluated. The location of building and possibilities of building usage are being€ evaluated also. Vilnius real estate market data was collected from Vilnius general plan. Values of building at various stages of reconstruction are calculated. There are 5 different alternatives of marketing. The scheme of building marketing is presented in Fig 2. There are schedules of the reconstruction work made (Figs 3 and 4). An estimation of different alternatives of building reconstruction is calculated (Table 3). Alternatives of building regeneration were evaluated in accordance with 14 criteria: profit of the project, life-time of building, price of the maintenance, perspectives of business, comfortability of building, price of building sale, insulation, possible losses because of accidents, cost of the building acquiring and reconstruction, location of building, price of the rent, term from the building acquiring till realisation, place for car parking and appearance. Decision matrix is presented in Table 4. Rationality of alternatives was calculated using TOPSIS method. Ranking of alternatives is presented in Table 5. We suppose that multi-criteria evaluation of the investment options creates new possibilities for investors and helps to choose the best variant of the building usage.
Nustatytas senamiesčių pastatų renovacijos rinkodaros principas. Senamiesčių pastatų renovacijos investiciniams uždaviniams spręsti sudaryta ir pasiūlyta nauja efektyvumo rodiklių sistema ir metodai. Patobulintas ekspertinis porinio lyginimo metodas, taikomas efektyvumo rodiklių reikšmingumams nustatyti. Pirmą kartą statybos investiciniams uždaviniams spręsti pritaikytas LINMAP (Linear Programming Techniques for Multidimensional Analysis of Preference) metodas. Pateiktas selektonovacijos metodų kompleksas (1 pav.), skirtas investicijų į senamiesčių pastatų renovaciją analizės uždaviniams spręsti. Sukurta programmė įranga WinDeterminator (2, 3 pav.) selektonovacijos uždaviniams spręsti. Metodo galimybės buvo parodytos sprendžiant realų senamiesčio pastato renovacijos variantų lyginimo uždavinį.
The article presents the results of study conducted during the MBAIC project. The main task of the project was to deepen Directive’s 89/48/EWG ideas, which will lead to creation of proper European system of comparison, certification and mutual recognition of managerial qualifications in construction. During the project, the survey on managerial competences in construction was conducted. The project resulted with new postgraduate studies for construction managers were created forming common platform of managerial knowledge. The scope of knowledge included in didactic material was agreed with representatives of European construction industry. This base of knowledge will extend the foundations of recognition and certification of managerial qualifications in construction, in EU.
Summary The paper presents the ideology of a qualitative approach to decision making ‐ verbal decision analysis. The authors have analyzed existing quantitative approaches and pointed out their main disadvantages. They formulated the requirements for decision‐making methods taking into account these disadvantages: psychological correctness of a dialog with decision maker (DM), strict mathematical proof of the methods and checking of DM information for consistency. The authors present the results of research on psychological correctness of operations of preference elicitation from DM. Several existing verbal decision analysis methods are briefly mentioned.
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