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1
Content available Households electricity usage analysis and the effectiveness of changing tariff group
Nafkha R., Woźniakowski T.
Information Systems in Management
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2018
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Vol. 7, No. 3
171--179
EN
After the introduction of the Energy Law in 1997, many enterprises started to operate in the power industry, which is translated into the electricity prices competitiveness. The further household tariff extension with more expensive rates at peak times, and favorable lower rates during the night and off-peak hours, did not result significantly change among users belonging to the most generic household tariff G11 with a single electricity rate per KWh (Kilowatt hour) regardless time of use. The article analyzes the electricity purchase and supply costs of the largest households group belonging to G11 tariff and simulates the effectiveness of moving from existing tariff group to the offered competitive tariff according to electricity suppliers.
2
Content available Context-social model of prosumption in e-commerce : analysis of a prototype solution for clothing industry
Woźniakowski T., Nowakowska M., Nafkha R.
Information Systems in Management
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2018
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Vol. 7, No. 4
286--297
EN
The aim of this paper is to look at cooperation practices between producers and prosumers in e-commerce and to explore future possibilities. The paper presents project of an innovative solution utilizing habits of social media users to provide valuable suggestion to clothes’ purchasers. Described system will enable not only acquiring opinions on specific products by also its correlations with other items. Recommendation system could be also utilized by clothes manufactures and sellers to deliver valuable data about consumers real opinions and preferences. The last decade has seen a considerable increase of online shops for fashion goods. Technological advancements, improvements in logistics, and changes in buyer behavior have led to a dissemination of apparel goods and respective data on the Web.
3
Content available The pert method in estimating project duration
Nafkha R.
Information Systems in Management
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2016
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Vol. 5, No. 4
542--550
EN
In order to complete a project in time, companies must determine both the duration of the entire project as well as each of its individual tasks. Very often less experienced companies do not collect data affecting time limit for project completion. Then time required to perform specified activities are determined based on estimation and companies own experience. To minimize the risk error arising as a result of using incomplete historical data and simultaneously increasing the effectiveness of estimating the duration of the project, most project managers with pleasure use the PERT method (Program Evaluation and Review Technique) to estimate the duration of individual tasks of the project on the basis of three intermediate estimation values: optimistic, realistic and pessimistic. This paper will set the duration of an IT (Information Technology) project implementation tasks, determine both critical tasks as well as critical path of the project. Based on estimates deadlines events values, the probability of occurrence time limits shall be also appointed.
4
Content available The critical path method in estimating project duration
Nafkha R., Wiliński A.
Information Systems in Management
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2016
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Vol. 5, No. 1
78--87
EN
Undoubtedly, the most important criterion for assessing any project success is to achieve the planned main objective within scheduled time, under the assumed costs and corresponding to established project quality parameters. The article presents critical path method, that aims to determine project schedule which ensure an implementation shortest time. Ultimately, however the optimal project duration is designated after solving human resource deficiencies or conflicts occurring in the generated schedule.
5
Content available Project and analysis of solutions applied in e-learning systems
Strzęciwilk D., Sierant P., Nafkha R.
Information Systems in Management
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2016
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Vol. 5, No. 2
260--271
EN
The article presents attempts to identify the needs and problems of modern e-learning and designed a solution that meets the needs of the recipients of e-learning and e-learning content providers. On the basis of this analysis, it was found that the market lacks the e-learning platform that meets all the needs and requirements in remote education. E-learning systems are very poor functionally, and tools for achieving the objectives, such as content creation, content distribution, management learning, and synchronous online meetings appear as separate applications that do not necessarily work well together. Most often each of them must be used separately that extends the preparation of training materials, and is a burden in the administration and supervision of the training course. On the basis of the analysis of remote training needs of recipients and creators of content proposed solution supporting distance learning. On the basis of the analysis of literature and research of user behavior designed and developed an integrated e-learning platform that meets the expectations of the users. The system has successfully motivating tool to complete training and does not require expensive implementation. The main objective of the proposed system was to eliminate the disadvantages observed in other systems. It was found that the human factor impeding the effective acquisition of knowledge as lack of motivation for self-study and the lack of contact with the teacher. In order to minimize the impact of these factors on the educational goals proposed solutions such as elements of competition and extensive virtual classrooms.
6
Content available Risk assessment for ERP system implementation
Nafkha R., Strzęciwilk D.
Information Systems in Management
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2014
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Vol. 3, No. 3
182--192
EN
In this article, based on the results of questionnaire sent to 50 companies with different employment size, events affecting the failures of the ERP system implementation were identified and their risk level as well as additional costs related to preventive actions (reducing the probability or effects of the problem occurrence) were investigated. To evaluate the risk values of chosen ERP system implementation tasks, PMI (Project Management Institute) standard was applied.
7
Content available Preliminary guidelines for the construction of an expert system for support of the implementation process of information systems
Nafkha R., Olejniczak M.
Information Systems in Management
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2013
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Vol. 2, No. 3
207--213
EN
The process implementing of modern information systems in medium and large enterprises, more and more often is associated with a number of problems that can occur already at the planning stage. Often incorrect or incomplete separation of problem factors causes that the procedure of implementation of such a system can significantly lengthen, and in the worst case end in failure. Therefore, a crucial part of this process, it is possible to determine the potential problems and consequences thereof already at an early stage in the project. Modern technologies of artificial intelligence are increasingly becoming an indispensable tool supporting decisionmaking in different areas of economic activity. In the following work was analyzed the effectiveness of the use of an expert system in the implementation of information systems based on the skeletal system PC-SHELL. On the basis of research was developed scheme of building the knowledge base for future expert system to support the implementation of the information systems.
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