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Svetlobni opozorilniki hitrosti v cestnem prometu : diplomsko delo
Bojan Kerin, 2010, undergraduate thesis

Abstract: V diplomski nalogi smo se osredotočili na področje povečanja prometne varnosti s pomočjo svetlobnih opozorilnikov hitrosti. Na kratko smo poskušali povzeti trenutno stanje varnosti v cestnem prometu na področju Evropske unije in jo primerjali z nacionalno problematiko. Pod drobnogled smo vzeli problematiko omejevanja hitrosti, ki je ključni faktor prometnih nesreč s hudimi telesnimi poškodbami in s smrtnim izidom, ki puščajo posledice tako na ljudeh kot tudi na samem gospodarstvu. Po študijah, ki smo jih opravili (pri izdelavi diplomskega dela), smo prišli do zaključka, da bi uporaba svetlobnih opozorilnikov hitrosti pripomogla k izboljšanju prometne varnosti, še zlasti na črnih točkah. Z uporabo takšnih naprav se izboljša percepcija prometne signalizacije zaradi osvetlitve iz sekundarnega vira svetlobe. Uporabljamo jih lahko v namene statističnih analiz stanja na cestah. Zaradi omejevanja hitrosti se posledično izboljša tudi kakovost življenja ljudi, ki živijo neposredno ob cesti, hkrati pa se doseže zmanjšanje izpustov strupenih plinov iz vozil. Z modifikacijo bi lahko svetlobne opozorilnike hitrosti uporabljali tudi na nivojskih prehodih čez železnico, ki bi nadomestili drage zapornice. Prednost svetlobnih opozorilnikov hitrosti je možnost njihove nadgradnje in uporabe za prihajajoče inteligentne prometne sisteme.
Keywords: svetlobni opozorilniki hitrosti, vizija nič, omejevanje hitrosti, prometna varnost, črne točke, light-based speed warning system, vision zero, speed limitation, traffic safety, black spots
Published: 03.09.2010; Views: 2292; Downloads: 124
.pdf Full text (2,55 MB)

QoS-oriented design of embedded systems with specification PEARL
Roman Gumzej, Wolfgang A. Halang, 2007, original scientific article

Abstract: Only recently have methodical tools adequate to design real-time systems been formally introduced in design methodologies. Naturally, they were present fromthe beginning, but due to the large diversity of embedded systemsć areas of deployment, specially dedicated formalisms have been developed and used. High-level language programming and integration of modeling formalisms into design methods eased the development of more complex real-time applications. With the emerging object-oriented programming languages and design methods, their integration into larger information systems has become more transparent. It was the UML methodology, however, which eventually merged also the design methods and concepts of real-time systems into a consistent whole. It took a large consortium and a long process to persuade industry of the benefits the new integral methodology can offer. On the other hand, there are some trade-offs, and there are some features not completely covered, yet. Here, a different, more straightforward approach to program and design (embedded) real-time systems is presented. Since it emerged from the real-time community, it includes most features relevant there. Independent of the UML profile for schedulability, performance and time specification, a profile was devised for use in PEARL-oriented UML design. The strengths of the mentioned language and design methods for QoS-oriented design of (embedded) real-time systems are emphasised throughout this article.
Keywords: real time systems, embedded systems, quality of service, co-design, co-simulation, safety, dependability, security, timeliness, determinism, readiness, reliability, portability, flexibility, specification PEARL, UML profiles, patterns
Published: 31.05.2012; Views: 1696; Downloads: 74
URL Link to full text

Police officers' and citizens' attitudes toward the provision of safety/security in local communities in Slovenia : doctoral dissertation
Maja Modic, 2013, doctoral dissertation

Abstract: Main purpose of the dissertation is to compare police officers’ and citizens’ attitudes toward various aspects of local safety provision, with the emphasis on community policing, which is currently the main philosophy of policing in Slovenia. Data for the study comes from a survey administred to a sample of police officers and citizens to assess their attitudes on a broad range of issues regarding the provision of safety on the local level as related to Slovene police in general, police effectiveness in various activities, legality of police work and citizens’ willingness to cooperate with the police among others. Within the comparison between citizens’ and police officers’ attitudes, areas of the highest and the lowest degree of concordance between attitudes were identified and examined. Attitudes of police officers and citizens were found to be most dissimilar regarding legality of police work, effectiveness in protecting life, personal safety and property, general perceptions of police and effectiveness in community policing. Overall level of concordance between attitudes of both groups was found to be low. The foci of our further analysis were the factors which influence citizens’ and police officers’ attitudes toward police effectiveness in community policing. Effects of gender, age, education, fear of crime and residency characteristics on citizens’ attitudes were examined, and effects of age, education, participatory management, organizational support, job satisfaction and community support on police officers’ attitudes were examined. Results of regression analysis showed that police visibility, trust in the government, age, fear of crime and length of residency affect citizens’ attitudes toward police effectiveness in community policing, however these variables account only for 30.1 percent of the variation in citizens' attitudes toward community policing. Police officers’ attitudes toward police effectiveness in community policing are affected by age, education, organizational support, job satisfaction and community support. These variables were found to account only for 28.7 percent of the variation in police officers' attitudes toward community policing. Majority of the variation in both groups’ attitudes toward community policing thus remains unexplained. Suggestions for further research and policy implication are provided, focused on inclusion of additional variables into model of police officers’ attitudes and model of citizens’ attitudes. Variables found to affect citizens of both groups toward police effectiveness in community policing by the findings of present research should be taken into consideration by police administrators and local safety policy makers.
Keywords: police officers’ attitudes, citizens’ attitudes, local safety provision, community policing, police-community relations, police-community cooperation, community policing officer, local safety council
Published: 15.04.2013; Views: 2103; Downloads: 218
.pdf Full text (1,42 MB)

A safety shell for UML-RT projects
Roman Gumzej, Wolfgang A. Halang, 2008, published scientific conference contribution

Abstract: A safety shell pattern was defined based on a reconfiguration management pattern, and inspired by the architectural specifications in Specification PEARL. It is meant to be used for real-time applications to be developed with UML-RT as described. The implementation of the safety shell features as defined by in [8], namely its timing and state guards as well as I/O protection and exception handling mechanisms, is explained. The pattern is parameterised by defining the properties of its components as well as by defining the mapping between software and hardware architectures. Initial and alternative execution scenarios as well as the method for switching between them are defined. The goal pursued with the safety shell is to obtain clearly specified operation scenarios with well defined transitions between them. To achieve safe and timely operation, the pattern must provide safety shell mechanisms for an application designed, i.e., enable its predictable deterministic and temporally predictable operation now and in the future.
Keywords: real-time systems, embedded systems, UML profiles, UML patterns, safety
Published: 31.05.2012; Views: 1073; Downloads: 66
URL Link to full text

Assessment of the consequences of accident scenarios involving dangerous substances
Zorka Novak-Pintarič, 2007, original scientific article

Abstract: This paper highlights the major steps in the procedure for evaluating the consequences of accidents involving dangerous substances, especially during storage, loading and unloading activities. The procedure relies on identifying accident scenarios that could be encountered in particular plants, followed by modelling of these scenarios by means of available modelling systems. Finally, the resultant outcomes are identified, together with their effects on both people and property. The resources needed to perform this proceedure are discussed, in order to clarify the roles of operators, external experts and other institutions when evaluating any accident conesquences. Four examples, all relevant in industrial practice, are given in order to illustrate the procedure: the releasing of liquefied petroleum gas, flammable organic solvents, toxic chlorine, and fuel oil. The results of these studies may be used for a quick order-of-magnitude estimation of accidents consequences.
Keywords: chemical industries, dangerous substances, transportation, storage, risk, accidents, consequences estimation, Seveso II, loading, unloading, safety report
Published: 01.06.2012; Views: 1467; Downloads: 74
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Improving integrity of embedded computers in control
Matjaž Colnarič, Domen Verber, Wolfgang A. Halang, 2003, review article

Abstract: This paper gives an overview of a holistic project dealing with the consistent design of embedded control systems falling into the first level of safety integrity requirements (SIL l) (IEC, 1998). It shows how existing methods can be adapted and reasonably employed, whenever possible, without having to resort to new innovations. Firstly, the hardware issues are dealt with and extensively elaborated, particularly the peripheral interfaces with integrated processing capabilities. Secondly, the proven correct real-time operating system executing on its own dedicated processor is briefly addressed, and finally, programming issues including descriptions of the specific programming language, time bounded handling of exceptions, and how to deal with temporal overload.
Keywords: safety critical embedded systems, embedded systems, fault tolerant control systems, peripheral interfaces, exception handling, overload
Published: 01.06.2012; Views: 947; Downloads: 76
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Analysis of FRP side-door impact beam
Simon Eržen, Zoran Ren, Ivan Anžel, 2002, published scientific conference contribution

Abstract: The paper addresses the applicability importance of Fiber Reinforced Plastics (FRP) in automotive industry. Increased usage of FRP directly influences the car weight reduction and, consequently, gas emissions. An example is presentedfor the solution of reducing the total weight of a passenger car using a local design solution, which comprises a redesign of a side-door impact beam made of Twintex. The Finite Element Method (FEM) was used for computational analyses of behaviour of side-door impact beam under loading with aim to determine its capacity of impact energy absorption in relation to a standard steel impact beam. Different stacking sequences of composite beam were analysed with intention to find the most suitable solution in terms of strength, stiffness, absorbed energy and weight reduction. Computational analyses have shown that appropriately stacked Twintex impact beam has adequate load-carrying capacities and that it absorbs more strain energy as its steel equivalent. By following the criteria for maintaining the same stiffness, it is shown that employment of the Twintex composite leads to an overall increase of the beam dimensions. Nonetheless, a 10 % weight reduction is achieved with respect to steel.
Keywords: passenger car, passive safety, side-door impact beam, lightweight materials, numerical methods, absorbed energy
Published: 01.06.2012; Views: 1156; Downloads: 42
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An assessment of risk and safety in civil aviation - dialogue from the black box
Milan Janić, 2000, review article

Abstract: Risk and safety have always been important considerations in civil aviation. This is particularly so under current conditions of continuous growth in air transport demand, frequent scarcity of airport and infrastructure capacity, and thus permanent and increased pressure on the system components. There is also the growing public and operators' awareness of these and other system externalities such as air pollution, noise, land use, water/soil pollution and waste management, and congestion. This paper offers an assessment of risk and safety in civil aviation. It deals with general concept of risk and safety, describes the main causes of aircraft accidents and proposes a methodology for quantifying risk and safety.
Keywords: risk, safety, civil aviation, externalities
Published: 05.06.2012; Views: 871; Downloads: 10
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The method of recognition of forms when trying to select street direction
Štefan Novak, Darja Topolšek, 2009, original scientific article

Abstract: The methods concerned together with their characteristics of technical advantage exploitation affects the realization times and costs of the transport. The proper selection of a street would greatly affect those costs of transport that can be reduced as well as the speeds of the realization which could be accelerated. This article shows one of the methods of recognition of the forms with a test on a street type selection example. The aim of this article is showing the possibilities of the form recognition usage in the traffic and transport system. This sort of selection and classification is needed when the necessity to quickly decide about the direction of movement, particularly in special circumstances, arise.
Keywords: road, traffic safety, street selection, recognition of form
Published: 05.06.2012; Views: 917; Downloads: 20
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