Wyniki wyszukiwania - Biblioteka Nauki

1

Algorytm porównania histogramów wielomodalnych opóźnień komunikacyjnych w transmisji bezprzewodowej

100%

Krupanek B. , Bogacz R.

|

tom R. 90, nr 11

32--34

PL

Do opisu parametrów transmisji komunikatów, zwłaszcza w sieciach z losowym dostępem do nośnika, bardzo często stosuje się histogram. W praktyce często zachodzi konieczność porównania dwóch lub więcej histogramów – mówi się wtedy o identyfikacji parametrów rozkładu. W referacie przedstawiono metodę porównywania histogramów w kontekście transmisji bezprzewodowej.

EN

To describe the wireless transmission parameters, in particular in networks with random access to the medium, very often are used histograms. In practice, it is often necessary to compare two or more histograms – this is the identification process of parameters of the distribution. The paper presents various methods of comparing histograms in the context of wireless transmission.

2

Investigations of transmission delays in ZigBee networks

100%

Krupanek B. , Bogacz R.

|

tom R. 90, nr 1

70--75

EN

The paper is devoted to the issue of determining and modeling of communication delays in Zigbee networks. The basis for the model is a description of the transmission between two arbitrarily selected nodes that transmit data between each other without other intermediate nodes. The model can be extended to describe complex transmission of the network, as shown in this publication.

PL

Referat jest poświecony zagadnieniu wyznaczania i modelowania opóźnień komunikacyjnych w sieciach Zigbee. Podstawą do modelowania jest opis transmisji pomiędzy dwoma dowolnie wybranymi węzłami, które przesyłają pomiędzy sobą dane bez innych węzłów pośredniczących. Model można rozszerzyć tak, aby opisywać transmisję dla dowolnie złożonej sieci, co pokazano w niniejszej publikacji.

3

Measures to Mitigate the Main Causes of Social Housing Delays in Algeria

100%

Zemra R. , Saighi O.

|

tom Vol. 33, no. 2

13--33

EN

Social housing in Algeria is carried out with state budget funds in order to eliminate social inequalities and guarantee a decent life to the citizen. However, delays have been observed in the realization. This study aims to examine the main causes and develop guidelines to effectively mitigate delays. Through an in-depth analysis of the literature and formal interviews on the topic of potential risks with construction experts, a list of 67 delay factors was identified. Data was collected through an online questionnaire via Google Forms and semi-structured interviews of a sample professionals established in Algeria. A total of 59 valid responses were analyzed and classified by SPSS software. The results indicate that the 5 most critical causes are: "Delay in payment", "Slow change orders in extra works", "Ineffective planning and scheduling", "Slow change orders in extra quantities", and "Difficulties in financing the project by contractor". Though, the correct implementation of the measures suggested by this study allows government authorities and professionals to deal with the 10 most critical causes that have favored the occurrence of delays in order to successfully implement similar construction projects.

4

Simple stability conditions for linear positive discrete-time systems with delays

100%

Busłowicz M.

|

nr 4

5

Robust stability of positive discrete-time linear systems with multiple delays with linear unity rank uncertainty structure or non-negative perturbation matrices

100%

Busłowicz M.

|

6

Improving N-NEH+ algorithm by using Starting Point method

80%

Puka R. , Łamasz B. , Skalna I.

|

tom Vol. 30

357--361

EN

The N-NEH+ algorithm is one of the most efficient construction algorithms for solving the permutation flow-shop problem with the makespan criterion. It extends the well-known NEH heuristic with the N-list technique. In this paper, we propose the Starting Point (SP) method that employs a new strategy for using the N-list technique. Extensive numerical experiments on the standard set of Taillard's and VRF benchmarks show that the SP method significantly improves the results of the N-NEH+ algorithm.

7

Koszty ogólne zarządu - przegląd metod określania wartości roszczeń wykonawców z tytułu opóźnień

80%

Juszczyk M.

|

tom nr 12

98--100

PL

Celem artykułu jest przegląd metod pozwalających określić roszczenia wykonawców robót budowlanych z tytułu ich opóźnień, za które odpowiedzialność ponosi inwestor. Skupiono się na szczególnym rodzaju kosztów, jakie stanowią w przedsiębiorstwach budowlanych koszty ogólne zarządu. Omówiono wybrane metody obliczeniowe i porównano je pod względem założeń, zasad oraz danych wejściowych koniecznych do obliczeń. Porównano także obliczone wartości roszczeń. Analiza założeń i wyniki obliczeń wykazały rozbieżności pomiędzy poszczególnymi metodami.

EN

The aim of the paper is to review the methods allowing to determinate contractors claims due to delays in construction works for which the client is responsible. Focuses on the specific type of costs - namely head office overheads in construction companies. Selected methods in the form of calculation formulas are discussed. Compared in terms of their assumptions and principles as well as input data necessary for calculations. Additionally the results of claims computations are also compared on the basis of calculation example. The analysis of the methods principles and the computations results revealed discrepancies between the discussed methods.

8

Investigation of factors responsible for delays in the execution of adequately funded construction projects

80%

Ogbeifun E. , Pretorius J. H. C.

|

tom Vol. 14, no. 1

93--102

EN

Many research efforts have identified funding as a critical factor responsible for the delays in the execution of construction projects. These funding challenges affect the client and contractors alike. However, there is limited information on why delays occur in sponsored projects with evidently adequate funding. Therefore, the study focuses on exploring the factors that impact the cash flow during the execution of sponsored construction projects. The multiple-site case-study method of qualitative research was adopted, involving five universities benefiting from the infrastructure funding provided by a government agency in Nigeria. The Delphi technique was used for data collection and analysis, complemented with interviews. The findings identified six factors causing the delays. They were divided into internal and external factors. The internal factors are faulty contractor selection processes resulting in delays by contractors and the failure to complete appropriate phases of a project. The external factors include the delays in the project management system of the funding agency in terms of inspection, monitoring, evaluation and progress certification. The research identified that the combined effect of internal and external factors negatively impacts the project cash flow, which in turn influences project delivery delays. Therefore, this study recommends improvements in the in-house contractor selection processes and the decentralisation of the project inspection, monitoring and evaluation operations of the funding agency. This will facilitate timely inspection, audit, and progress certification, enabling the early release of the second tranche of the project fund. This will ameliorate the negative effects arising due to low cash flow and associated delays in project delivery.