Generalized Nets Model of an E-Learning System Software Architecture

The paper has been presented at the International Conference Pioneers of Bulgarian Mathematics, Dedicated to Nikola Obreshko ff and Lubomir Tschakaloff , Sofi a, July, 2006.Component-based software engineering and software architecture are tightly connected areas in computer science. Software architecture presents the functionality of the system as decomposition into components, the properties of these components and the connectors between them. This paper illustrates a methodology for application of the theory of Generalized Nets (GNs) as a language for description of software systems architecture. According to this methodology, every component in the system, as well as every connector is represented by a single GN transition. This way the positions of the transition describe the ports of components and connectors in the system. This paper introduces a model of the component-based architecture of the e-learning system ARCADE, which is created, with respect to the proposed methodology for description with GNs. The four main subsystems are regarded as components in the GNs model. Their additional sub-modules are presented as the services provided by the components. Method calls are regarded as the connectors between these components. Further, the GNs model is compared with the existing UML diagrams, specifying the design of ARCADE

Advanced Approach for Effective Verification of Component Based Software Systems

The development of complex systems based on reusable components has many advantages such as lower costs and shortened development lifecycles. At the same time this innovative approach continues to place significant challenges towards integration and testing of such systems. The paper analyses the difficulties of components testing and proposes a combination of Built-In-Testing, Aspect Oriented Software Development, Test Driven Development and Test Governance to realize a method for effective verification in component based systems.The work presented in this paper was partially supported by grants from the National Science Fund in Bulgaria under the MU-01-143 (ADEESS) project and the SISTER project, funded by the European Commission in FP7-SP4 Capacities

ID8.12 Network Management Tool API

Internal Deliverable 8.12. Description of API for the network management toolThe work on this publication has been sponsored by the TENCompetence Integrated Project that is funded by the European Commission's 6th Framework Programme, priority IST/Technology Enhanced Learning. Contract 027087 [http://www.tencompetence.org

Queixa Digital: análise do setor das telecomunicações na rede social Facebook

A presente dissertação consiste numa análise quantitativa ao sector das telecomunicações, focada no contexto das reclamações de falhas de serviços na rede social Facebook. Foram analisadas quatro empresas na rede social Facebook, sendo estas: Vodafone, Meo, Nos e Nowo. Este estudo foi realizado porque existe pouco conhecimento sobre a eficiência, eficácia e esforço das empresas no tratamento das reclamações online, principalmente no contexto das redes sociais, na perspetiva da justiça percebida dos clientes. Foram definidos dois objetivos. O primeiro objetivo é aplicado: diferenciar as empresas na sua eficiência através da comparação do esforço e eficácia. O segundo objetivo é fundamental: testar a hipótese de que a relação entre o esforço e a eficácia é moderada pela severidade do problema, no sentido da relação ser mais fraca quando o problema é maior. Nesta investigação, o primeiro objetivo não se realizou devido aos mecanismos contra o abuso de envio de mensagens privadas que a rede social Facebook tem, originando desta forma bloqueio na conta do remetente. O segundo objetivo foi testado para a empresa MEO, na rede social Facebook. A moderação esperada é no sentido da relação, entre o esforço e a eficácia, ser mais fraca quando a severidade do problema é maior do que quando é menor. Depois da análise dos dados, observou-se que a baixa severidade contribui muito mais para o aumento da eficácia do que a alta severidade. Verificou-se igualmente que o alto esforço não contribui significativamente para o aumento da eficácia se a severidade do problema for alta.The present dissertation is a quantitative analysis of the telecommunications sector, focused on the context of complaints of services failures, on the social network Facebook. Four companies were analyzed in the social network Facebook: Vodafone, Meo, Nos and Nowo. This study was conducted because there is little knowledge about the efficiency, effectiveness and effort of companies in the treatment of online compaints, especially in the context of social networks, from the perceived fairness by clients. Two objectives were defined. The first objective is applied: differentiating the companies in their efficiency through the comparison of effort and effectiveness. The second objective is fundamental: testing the hypothesis that the relationship between effort and effectiveness is moderated by the severity of the problem, in that the relationship is weaker when the problem is more severe. In this investigation, the first objective wasn´t realized due to the mechanisms agains the abuse of sending private mensagens that the social network Facebook has, originating in this way blocking the account of the sender. The second objective was tested for the company MEO, in the social network Facebook. The expected moderation effect is in the sense that the relationship between effort and effectiveness is weaker when the severity of the problem is greater than when it is minor. After the data analysis, it was observed that the low severity contributes much more to the increase of the effectiveness than the high severity. It has also been found that the high effort does not contribute significantly to increased effectiveness if the severity of the problem is high

Физичко – механички карактеристики на карбонатите од локалитетот Видовиште

Трудот ги претставува физичко-механичките карактеристики на карбонатните минерални суровини од палеозојскиот карбонатен масив на локалитетот Видовиште, Република Северна Македонија. Истражуваниот терен се наоѓа во источниот дел на Република Северна Македонија, поточно во Кочанско, во атарот на селото Видовиште, а административно припаѓа на општина Зрновци. Истражниот терен зафаќа површина од околу 0,42 km². Испитувањето на физичко - механичките карактеристики на материјалот, нивниот хемиски состав и минералошко-петрографските карактеристики, како и посебните анализи на дробениот материјал 0 – 63 mm, покажаа дека материјалот може да се користи во градежништвото како тампонски материјал на долен строј на патишта, а исто така, како агрегат за дробење за бетонски и асфалтни мешавини и друго

Physical - mechanical characteristics of the carbonates from the locality of Vidovište

Abstract The paper presents the physico-mechanical characteristics of the carbonate mineral raw materials from the Paleozoic carbonate massif of the Vidovishte locality, Republic of North Macedonia. The researched area is located in the eastern part of the Republic of North Macedonia, specifically in the vicinity of Kochani, near the village of Vidovishte, and administratively belongs to the municipality of Zrnovci. The research area covers an area of about 0.42 km². The examination of the physical-mechanical characteristics of the material, their chemical composition and mineralogical-petrographic characteristics, as well as the special analyzes of the crushed material 0 – 63 mm, showed that the material can be used in construction as a buffer material for the lower course of roads, and also, as a crushing aggregate for concrete and asphalt mixes. Key words carbonates, physical-mechanical characteristics, chemical composition buffe

AN APPROACH FOR COMMUNICATION RELAIBILITY USING SELF-ADAPTIVE AUTONOMIC COMPUTING TECHNIQUES

Interdependency of electric power grids and information and communication technology is a rapidly growing topic. With the introduction of Smart Grid, handling dynamic load tracking, dynamic tariffs, clients that can consume but also produce electricity that can be delivered to the grid has become a part of everyday operational cycles within power supply companies. Hence, electricity distribution and power supply companies are in need for introduction of efficient mechanisms for the optimal tracking and use of available electric energy. In this paper, we describe the low voltage (LV) distribution network monitoring system developed for the Electric Power Industry of Serbia (EPS) electricity distribution company. The system we present is implemented in a way so that it provides abilities to measures, communicates and stores real-time data, translating it into actionable information needed by EPS to meet the described challenges regarding LV distribution networks. The implemented system is using self-adaptive autonomic computing techniques to provide a reliable data transfer from measurement devices deployed in different parts of the LV distribution network

Green manure as a Tool of organic produced potato (Solanum tuberosum L. cv. Amorosa)

During September 2003 to August 2004 has been done study with winter common vetch Vicia sativa L. cv. MS Sirmium as pre-culture of followed vegetables. After "green manure" practicing on the same plots were set up potato cv. Amorosa. Soil samples were taken before common vetch sowing, after its decomposition and carrot. Carrot quality was established through chemical analyzing of total and soluble carbohydrates, vitamin C and proteins compared with control. Resulted by "green manure" soil humus, soil nitrogen, light available soil phosphorous and potassium are larger. After Ist gathering potato dimensions are characterized with increased average dimensions, yield per plant and yield in total as well. Total carbohydrate content at manure plots is amounted 17.02 %/100 mg d.m. that means 33.45 %/100 g d.m. increasing compared with control ones, while soluble content is 3.24 %/100 g d.m. and recorded 11.72%/100 g d.m. even. Protein content is increased for 4.22 %/100 g d.m. at green manure plots, differs of vitamin C content that is not higher compared with control and corresponded with literature data. Analyzed parameters are increased as result of potato tendency of soil potassium using

Tailoring the work function of graphene via defects, nitrogen-doping and hydrogenation : a first principles study

The effect of defects, nitrogen doping, and hydrogen saturation on the work function of graphene is investigated via first principle calculations. Whilst Stone–Wales defects have little effect, single and double vacancy defects increase the work function by decreasing charge density in the π-electron system. Substitutional nitrogen doping in defect-free graphene significantly decreases the work function, because the nitrogen atoms donate electrons to the π-electron system. In the presence of defects, these competing effects mean that higher nitrogen content is required to achieve similar reduction in work function as for crystalline graphene. Doping with pyridinic nitrogen atoms at vacancies slightly increases the work function, since pyridinic nitrogen does not contribute electrons to the π-electron system. Meanwhile, hydrogen saturation of the pyridinic nitrogen atoms significantly reduces the work function, due to a shift from pyridinic to graphitic-type behavior. These findings clearly explain some of the experimental work functions obtained for carbon and nitrogen-doped carbon materials in the literature, and has implications in applications such as photocatalysis, photovoltaics, electrochemistry, and electron field emission

Green manure as a way of organic produced carrot (Daucus carota L. cv. Nantes)

During October 2003 to August 2004 has been study with winter common vetch Vicia satiua L. cv. NS Sirmium. Early spring plowing of plots and "green manure" practicing enabled soil organic fertilization. On the same plots were set up carrot cv. Nantes compared with control. Soil samples were taken before common vetch sowing, after its decomposition and first carrot gathering. Carrot quality is evaluated through chemical analyzing of carbohydrates, protein and vitamin C content. Resulted of "green manuring" soil humus, nitrogen, light available phosphorous and potassium were larger. Number of carrot plants (39.27). dimensions (20.75 cmx2.07 cm), weight (59.88 g) and extracted sap (22.18 ml per plant) after Ist gathering are an average increased and yield per plant as well yield in total. Except extracted sap all investigated mentioned parameters were continue gained after the 2nd gathering (23.22 cmx2.69-dimensions. 62.44 g-weight. 18.45-extracted sap). Carbohydrate content is higher at organic produced carrot (20.15 %/100 g d.m.-total; 7.48 %/100 g d.m). protein either less as well (10.56 %/100 g d.m) and vitamin C significantly 3.41 %/100 g f.m then control 2.47 %/100 g f.m