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Acta polytechnica HungaricaVolume 10, Issue No. 8 (2013.)


  • Kohei Sugawara ,
    Hamido Fujita :

    Abstract: Interruption is occurred by partial participation of workflows with adding new activity to a worker. A concerned worker to the interrupted workflow must restructure task assignment to improve consumed operating time by interruption. An opportunity of decision making is occurred to the workers to select appropriate tasks. However, pre-assignment of tasks to workers includes an expectation of superior decision maker to a training of an inexperienced worker. In order to avoid overmuch improvement to the interrupted workflow, the alternatives for shortening operating time of tasks is computed by TOPSIS method. Although positive ideal solution and negative ideal solution in conventional TOPSIS method are based on objective attributes, subjective completion time of pre-assigned tasks that are positive ideal solution in this model is depending on subjective attributes of the worker. Therefore, this research proposes a novel extension of positive and negative ideal solution of TOPSIS method by aggregating based on subjective fuzzy attributes of the worker and objective attributes of tasks. The approach is examined on simple case study showing that the work is promising on providing solution to handle interruption on carried work in runtime.

    Keywords: Interruption; Workflow; Decision making; Subjective attributes; TOPSIS

  • Dániel L. Kovács ,
    Tadeusz P Dobrowiecki :
    Converting MA-PDDL to Extensive-Form Games27-47en [1.50 MB - PDF]EPA-02461-00046-0020

    Abstract: This paper presents algorithms for converting multi-agent planning (MAP) problems described in Multi-Agent Planning Domain Definition Language (MA-PDDL) to extensive-form games in order to analyse and solve them with game-theoretic tools in general. MA-PDDL is an attempt to standardize the description of MAP problems similarly to PDDL in the single-agent setting. In this paper MA-PDDL is extended with partial-observability and probabilistic-effects to model more realistic domains. The conversion is fruitful in both ways: 1) extensive-form games can be solved via game-theoretic solution concepts (e.g. Nash-equilibrium) providing solutions to corresponding MAP problems in general, and 2) MA-PDDL problems can be solved via MAP methods providing solutions to corresponding games. Both cooperative and non-cooperative solutions can be achieved.

    Keywords: multi-agent; planning; pddl; game theory; partial observability; probabilistic

  • Tamás Galli ,
    Francisco Chiclana ,
    Jenny Carter ,
    Helge Janicke :
    Modelling Execution Tracing Quality by Means of Type-1 Fuzzy Logic49-67en [430.61 kB - PDF]EPA-02461-00046-0030

    Abstract: Execution tracing quality is a crucial characteristic which contributes to the overall software product quality though the present quality frameworks neglect this property. In the scope of this pilot study the authors introduce a process to create a model for describing execution tracing as a quality property; moreover, the performance of four different models created is compared. The process and the models presented are capable of capturing subjective uncertainty which is an intrinsic part of the quality measurement process. In addition, the possibility of linking the presented models to software product quality frameworks is also illustrated.

    Keywords: software product quality models; execution tracing quality; fuzzy logic; uncertainty

  • Judit Németh-Katona :

    Abstract: The objective of this research: To comply a set of field exercises to evaluate environmental conditions with special emphasis on ecological and biological aspects, for the education of environmental engineering and engineering instructor students. Sets of tests to adequately analyze the environment in a complex way are practically non-existent. The few that exist are focused on some particular, narrow area, primarily examining inanimate environmental factors. The majority of these tests are chemical quick tests to detect the presence and level of a specific substance polluting the environment. The results are descriptive observations, merely stating facts, without offering any explanation for the causes of different phenomena, simply providing factual data measured in a particular moment in time. Based merely on these results, it could be hard or impossible to make any responsible suggestion regarding environmental or land development issues.

    Keywords: Education for the environment, The Application of Field Exercise in the Education of Environmentalism and Nature Conservation, Observation trail, Biologically qualified environment, Ecologically evaluated conditions

  • Fuqian Shi ,
    Pamela McCauley Bush :

    Abstract: Previous medical experiments illustrated that Valence and Arousal were high corresponded to brain response by amygdala and orbital frontal cortex through observation by functional magnetic resonance imaging (fMRI). In this paper, Valence-Arousal related fMRI data-set were acquired from the picture stimuli experiments, and finally the relative Valence -Arousal feature values for a given word that corresponding to a given picture stimuli were calculated. Gaussian bilateral filter and independent components analysis (ICA) based Gaussian component method were applied for image de-nosing and segmenting; to construct the timing signals of Valence and Arousal from fMRI data-set separately, expectation maximal of Gaussian mixed model was addressed to calculate the histogram, and furthermore, Otsu curve fitting algorithm was introduced to scale the computational complexity; time series based Valence -Arousal related curve were finally generated. In Valence-Arousal space, a fuzzy c-mean method was applied to get typical point that represented the word relative to the picture. Analyzed results showed the effectiveness of the proposed methods by comparing with other algorithms for feature extracting operations on fMRI data-set including power spectrum density (PSD), spline, shape-preserving and cubic fitting methods.

    Keywords: fMRI; Gaussian bilateral filter; Valence-Arousal; power spectrum density; GMM fuzzy c-mean

  • Csilla Patkó ,
    István Patkó ,
    Zoltán Pásztor :

    Abstract: The objective of our study is to determine the indoor air quality of a low-energy wooden house. During the field measurements we detected the presence of formaldehyde (34 μg/m3), BTX (35.51 μg/m3), and some materials in the terpene family, limonene (64.7 μg/m3), and alpha-pinene (297 μg/m3), in the indoor air. The concentration of the detected TVOC (Total Volatile Organic Compounds) was 2150 μg/m3, which does not significantly differ from European average values. The LCI (Lowest Concentration of Interest) analysis shows that none of the VOCs tested by us are a health risk to the occupants in the building. However, it can be established that the health risk of benzene (0.622) stands out from the tested substances. The health risks of other aliphatic hydrocarbons (0.176) and alpha-pinene (0.198) may be considered identical, but even these do not pose a risk to humans. In order to clarify the sources of the harmful substances further investigations are needed.

    Keywords: indoor air quality; VOC; formaldehyde; BTX; terpene; wooden building

  • Branislav Popkonstantinović ,
    Ljubomir Miladinović ,
    Marija Obadović ,
    gordana Ostojić ,
    Stevan Stankovski :

    Abstract: The paper analyzes the effects of pendulum temperature dilatation on the timepiece running and accounts for the basic mathematical principles that neutralization of these detrimental effects are based upon. Both preliminary and detailed calculations are presented, as well as some design solutions leading to technically acceptable pendulum temperature dilatation. Explanation is given for the design of bimetal gridiron pendulum, wood pendulum with a lead weight, mercury pendulum, and pendulum with an Invar alloy rod.

    Keywords: timepiece; dilatation; pendulum; compensation; temperature

  • Peter Bakucz ,
    Rolf Krüger-Sehm :
    Morphological Dilation as Fractal Scaling in Roughness Measurement129-138en [399.68 kB - PDF]EPA-02461-00046-0080

    Abstract: In this work we propose, that the morphological dilation acts as fractal filters rebuilding white noise roughness surfaces into fractal 1/fm noise surfaces. The fractality indicates that the dilation does not have characteristic length scale, and the structuring element follows power-law distribution. Yashchuk's binary pseudo-random grating standard has been dilated with spherical and free form tips between 50 nm and 2000 nm and two scaling regions are referred to the tip diameter versus scaling exponent diagram. The first one in the smaller tip diameter region has a fast slope and the second one in the intermediate and larger tip diameter has a gradual slope. The results show that the dilated surfaces arise from the activity of at least two dynamical systems.

    Keywords: Roughness; Morphological Filtering; Fractals

  • Takeshi Hashimoto ,
    Takayuki Suzuki ,
    Hidemichi Aoshima ,
    András Rövid :
    Real-Time and High Precision 3D Shape Measurement Method139-152en [1.04 MB - PDF]EPA-02461-00046-0090

    Abstract: In this paper, a unique 3D shape measurement method for measurement of nearly plain car body parts is proposed. The main advantage of the system is the high accuracy (about 0.1 mm), the high flexibility and the real-time processing. The primary application of the method is the 100% inspection of press formed car parts in the factory since in these cases the high accuracy and the real-time feature are indispensability. In order to achieve suitable measurement accuracy the camera specifications were carefully inspected. As result, a new type of gray-level marker and a new technique was proposed by the authors for compensating the time variability of marker central points in the camera images. In order to achieve real-time processing, the correspondence matching was devised. Furthermore, since the proposed method is based on processing camera images, i.e. the detection of feature-points on the target (such as screw holes) is also supported. The measured feature-points can easily be compared to CAE data.

    Keywords: 3D shape measurement; real-time; high-precision; car parts

  • Krisztián Lamár ,
    József Neszveda :
    Average Probability of Failure of Aperiodically Operated Devices153-167en [373.94 kB - PDF]EPA-02461-00046-0100

    Abstract: The aperiodically operated devices are typically non-operated or stored, usually in a powered-down state. The duration of being operated is much shorter than that of storage. These devices have to perform extremely reliably during usage, while the operation usually occurs under circumstances worse than the average. This paper proposes a calculation procedure of value jumps of failure rate caused by operating condition shifts, to determine the average probability of failure, based on the standards IEC 61511 and ANSI/ISA-84. In the suggested calculation method, a proposal is also made for taking the failure caused by the human factor during operation into account. It is known that the probability of successful operation is increasable with periodic diagnostic tests. The circumstances of diagnostic tests which interrupt the non-operated storage of the aperiodically operated devices differ from those described in the standards IEC 61511 and ANSI/ISA-84. As the repair rate given for the continuous technologies cannot be interpreted for diagnostic tests which interrupt the powered-down storage of the aperiodically operated devices, this paper suggests the implementation of the effect of tests into the calculation procedure as correction of state probabilities, and gives the required formulae. At last the article provides an easy algorithm for the suggested calculation method.

    Keywords: Aperiodic Operation, Average Probability of Failure, Value Jumps of Failure Rate, Diagnostic Coverage, Reliability

  • Alaattin Kaçal ,
    Ferhat Yildirim :
    High Speed Hard Turning of AISI S1 (60WCrV8) Cold Work Tool Steel169-186en [786.90 kB - PDF]EPA-02461-00046-0110

    Abstract: This study deals with experimental results of high speed hard turning of hardened AISI S1 cold work tool steel with ceramic and CBN cutting tools. Ceramic and CBN tools performance were evaluated based on machining force, surface roughness and tool wear. Cutting speed, feed rate, depth of cut and tool types were determined as processes parameters. Evaluating tool wear type and wear mechanism by tool makers’ microscope and SEM analysis. Analysis of variance (ANOVA) was used for observing that the most influencing machining parameters on the quality characteristics in terms of the statistically. CBN cutter exhibited a better performance than the ceramic cutter. For CBN and ceramic inserts, the increase in cutting speed increased the flank wear. After the turning of hardened workpiece, surfaces at grinding quality were obtained. It was predicted that, with the choice of appropriate cutting parameters, its hazardous effects of grinding operation on the environment and humans shall be decreased for such processes.

    Keywords: Hard turning; cold work tool steel; cutting force; tool wear; surface roughness

  • György Andor ,
    Ildikó Rózsa :
    Should Codification Emerge in IFRS? Does Form of Regulation Matter?187-204en [447.28 kB - PDF]EPA-02461-00046-0120

    Abstract: The International Financial Reporting Standards (IFRS) is in the process of becoming globally recognised in stock exchanges alongside the Generally Accepted Accounting Principles in the United States (US GAAP). The IFRS and US GAAP have evolved based on the GAAP encompassed by the list of standards that constitute the structure of both accounting literatures. The structure that this article refers to as “standard-based” has been a traditional format for the IFRS and US GAAP in the past. Whereas the IFRS still maintains a standard-based literature structure, US GAAP standard setters of the Financial Accounting Standards Board (FASB) decided to depart from the standard-based tradition of editing accounting literature by redesigning the existing authoritative US GAAP literature into a single codified text, titled the Accounting Standards Codification (ASC). This paper focused on the structures of IFRS and US GAAP to understand whether the ASC enhances the application of US GAAP by professionals. The objective of this paper was to determine whether the structure of the ASC offers an appropriate alternative to the standard-based structure of IFRS – making IFRS a user-friendly accounting literature in Central Europe. We administered a survey as a tool to foster discussion and to identify the features offered by the ASC, which is similar in structure to statutory accounting traditionally adopted in Central Europe.

    Keywords: IFRS; US GAAP; Codification; standard-based structure; stock exchange

  • Moulay Fatima ,
    Ramdani Youcef ,
    Habbati Assia ,
    Habib Hamdaoui ,
    Bendaoud Abdelber :

    Abstract: The purposed work is the design of a nonlinear voltage and rotor angle controller to improve the stability properties of a system which comprises a synchronous generator connected to an infinite bus and hydraulic turbine. The controller is based on the feedback linearization scheme. The advantage of this systematic nonlinear controller design is that the control system is liberalized in a wider domain. A linear control can then be used to stabilize the linear system. The performances of the linear voltage and rotor angle regulators are compared with those of the standard linear voltage and speed regulators in the presence of short circuits at the generators. The infinite bus and the non-linear regulator improved considerably the stability and the transient dynamic performance of the generator.

    Keywords: Nonlinear control; hydraulic turbine; synchronous generator; voltage regulation; rotor angle stability; feedback linearization

  • Anca-Gabriela Cârje ,
    Zoltán Juvancz ,
    Béla Tőkés :

    Abstract: Quantitative relations were studied between chiral separation parameters and chemical forms of ibuprofen. The structure, partition coefficients, enthalpy, entropy and free enthalpy change of inclusion complex formations of enantiomers have been established. Results of different methods were compared. The authors emphasis distinguished study of chiral recognition and the derivatization procedures.

    Keywords: chiral separation methods; ibuprofen; derivatization; structure – selectivity relationship