bluuebunny/crossref_metadata_2025 huggingface dataset:
Synographical Approach to Dynamical Systems Analysis
Authors: Markechová Iveta , Stúpalová Hana
Published: December 2014

Synographis a graphic equivalent of a synonym. It denotes various symbols/graphs with the same or very similar meaning. Till now synographs have appeared rarely and in diverse branches. They are, e. g. software engineering, linguistics, medicine, also marketing theory – with a slightly modificated word form, synography. Synograph can serve as a new inspiration in a research as well as in an education. The modest aim of this contribution is to introduce synographical approach as a next possible tool for dynamical systems analysis.
Optimization of Technical System by Using FTA and Genetic Algorithm
Authors: Libošvárová Adriána , Schreiber Peter
Published: December 2014

The main aim of the paper lies in providing a proposal of technical system optimization in terms of maximizing its reliability when a certain sum of maintenance costs is given, or minimizing maintenance costs to achieve the defined reliability. The technical system is analyzed using the method called fault tree analysis (FTA) and the final diagram is represented by a tree structure. At the top of the diagram, there is an undesired event which represents the system failure. This top event is analyzed and branched into several other events in order to obtain all possible faults of system elements and their combinations which lead to the system failure. Each primary event contains basic information as minimal and maximal reliability and the corresponding maintenance costs. As a result, it is possible to calculate the total probability of system failure, respectively to its reliability, and the total costs needed to ensure the required system reliability. Genetic algorithms are used and applied in the diagram created by FTA. The paper contains the whole proposal of using a genetic algorithm in order to optimize costs and system reliability on the basis of defined conditions. The described proposal is implemented within a functional application and then tested using real data. The results form an integral part of this paper.
Algorithms and Evolution Diagrams Application for Determining the New Assembly Process Sequences
Authors: Vetríková Nina , Šimúnová Michala
Published: December 2014

In this contribution is presented application of evolution diagrams at the assembly process of at the intelligent manufacturing and assembly cell. At this assembly cell was designed new assembly configuration for next research to our department and institute. Intelligent manufacturing and assembly cell is situated at the Institute of Production Systems and Applied Mechanics. The complex design of assembly sequences at the intelligent manufacturing and assembly cell is realized on the basis of evolution diagrams and outgoing from knowledge about intelligent manufacturing and assembly systems. For intelligence increase of assembly process was this cell completed by additional sensors. This assembly process is possible to name intelligent assembly process.
Precision Analysis of Optical 3D Digitisation of Shaped Elements
Authors: Mendřický Radomír
Published: December 2014

This paper presents results of a carried out research in the field of scanning precision of contactless optical 3D scanners. Results stated in this paper bring great benefits to practice, since it demonstrates the quality and limits of measuring by means of contactless optical systems in real conditions and therefore its possible use in the field of inspecting the dimensional and shape precision of industrial products.A measurement etalon of various shapes and sizes was designed and manufactured for the purpose of this analysis. The nominal dimensions of the etalon were set by measuring of the coordinate measuring machine and these real values were compared to the model obtained by optical digitisation of Atos II and RevScan. Based on the evaluation of results, scanner measurement precision diagrams were drawn according to the studied aspects, e.g. dependence on the shape of the measured element and its nominal size. Another essential part of the research was determining the ability of 3D scanners to capture detailed parts of the model and assessing the scanning limits for each of the optical systems.
Application of 3D Scanner for Transportation a CNC Machine Tools
Authors: Havlik Radek , Gottwaldova Alena , Vavruška Jan
Published: December 2014

This paper deals with research in area 3D digitalization of large objects. Application of 3D scanners for transportation is not common. Digitalized area is a final placement for new machines. Final location and transport way for machines is in very a low ceiling room. Using the 3D data we can determine an optimal way for transport. In next step we define optimal final placement for CNC machine tools. If we have 3D model from 3D scanner we can measure the height between the floor and ceiling.
Layout Redesign and Material Flow Analysis at a Flexible Assembly Cell Supported by the Use of Simulation
Authors: Delgado Sobrino Daynier Rolando , Holubek Radovan , Košťál Peter , Ružarovský Roman
Published: December 2014

This paper essentially emerges from scientific and teaching needs of a university institute while trying deepen into a more formal analysis and/or design process of the material flow and associated manufacturing decisions, e.g.: the layout. Fulfilling such needs, the paper makes allusion to key manufacturing decisions associated to the material flow, while stressing the fact of their mandatory consideration when integrally addressing the primary problem. A partial application of the ideas takes place at a flexible assembly cell of the institute; some of the main results of it are: (1) a more formal description of the whole cell including alternative material flow scenarios, (2) the proposal of a new scenario implying the redesign of the cell conception, i.e.: the layout and thus material flow itself, (3) the simulation and comparison of material flow scenarios selecting the best one in terms of both the MF and layout, among others. At the end, the integration of all these previous elements clearly contributed to the solution of the research’ problem and objectives traced within the frame of the research.
Dividing the Complicated General Shapes of the Surface into Partial Elements According to Curvature (Gauss and Maximal Curvature) and its Multi-Axis Machining
Authors: Šafka Jiří , Lachman Martin , Zelený Petr , Seidl Martin
Published: December 2014

The paper deals with multi-axis machining of complex shapes of freeform surfaces. Machining of such surfaces is very difficult and the critical operation is the optimal setting of tilt and lead angle which, along with other parameters, must ensure collision-free machining. This paper describes the possible dividing of solved freeform surface areas into partial elements with similar properties from CAD data using Matlab software instruments. The partition is solved by algorithms calculated according to the curvature of the surface using both methods the maximum and the Gaussian curvature. These partial elements can be machined separately which allows employment of tools with optimal dimensions for individual elements. This process enables significant reduction of tool-path necessary for machining these shapes which also leads to reduction of the working time. Furthermore, there are practical examples including a comparison of standard method and the use of machining process optimized by the algorithm in this article.
Properties of Models Produced by Direct Selective Laser Melting Technology
Authors: Ackermann Michal , Šafka Jiří , Zelený Petr , Lachman Martin , Keller Petr
Published: December 2014

The paper deals with evaluation of selected mechanical properties of tensile test specimens which were made from AlSi12 material by Direct Selective Laser Melting (DSLM) technology. Specimens were built in three various set-ups such as different angles towards building platform and various types of supporting structures in order to prove the influence of these parameters to mechanical properties of resulting product. The specimens were also subjected to material tests to reveal its inner structure, quality of a grain and chemical composition of the material. As a conclusion, the selection of the most suitable supporting structure and alignment of a model towards building platform are discussed. Mechanical parameters evaluated from tensile tests such as Young’s modulus (E), 0.2% proof stress (Re0,2) and tensile strength (Rm) are compared with values typical for the selected material AlSi12.
Application of Theory of Hypothesis Testing in Process of Laser Micromachining
Authors: Pata Vladimír , Sýkorová Libuše , Knedlova Jana , Řezníček Martin
Published: December 2014

The article focuses on the field of PMMA laser micromachining at change of the technological parameters. The aim was to evaluate machined surface roughness at different setting of DPI definition (number of dots – paths on square inch). The aim is application of the Theory of Hypothesis testing for evaluation changing of final surface during imputing variable technological parameters.
Optimization of the Mixing Process and Quality Evaluation of the Thirteen-Component Granular Mixture
Authors: Krolczyk Jolanta B. , Tukiendorf Marek , Dawid Rafał
Published: December 2014

The paper presents the research on the quality of thirteen-component granular mixture. The changes in the quality of the mixture after reduction the mixing time from a standard time of 30 minutes to: 25 minutes, 20 minutes and 15 minutes have been analyzed. The research has been conducted in industrial conditions where a vertical mixer with worm agitator with the charge of two tons was used. Research results were presented graphically as changes in concentration of components shares in the mixing time of 30, 25, 20 and 15 minutes and the obtained results were compared. Quality assessment of a thirteen-component mixture with the use of residual sum of squares for four mixing times was carried out.
Industrial Conditions of the Granular Material Manufacturing Process
Authors: Krolczyk Jolanta B.
Published: December 2014

The article presents industrial conditions of manufacturing multi-component heterogeneous mixtures of granular materials. The study analyzed the production technology and devices used for production such as storage siloes, an impact screen, a cyclone separator, a shaving and dust extractor, a screw mixer, a tensometric weigh, a bucket conveyor. A division and the successive stages of manufacturing process has been presented: unloading, receipt and storage of raw materials, quality control of components, technology cleaning and sorting of raw materials, dosage and mixing of feed material, bagging, storage, extraction processes and evaluation of homogeneity in a fodder mixing plant. Moreover the methods of assessing the homogeneity of the multi-component heterogeneous mixtures has been presented. The research was conducted in industrial conditions.
Augmented Reality Applied in Machining Processes and Cutting Tools Management
Authors: Petruse Radu Emanuil , Brîndaşu Paul Dan
Published: December 2014

This paper describes the benefit obtained from implementing a cutting tool management system. Also, a state of the art on tool management systems available on the market is presented. By analysing the drawbacks generated by the implementation of such a system, we are providing a cheap and practical solution: an Augmented Reality aided machining and tool management system. Using augmented reality we managed to improve the tool management systems by providing, at the scene of action, all the necessary tool information in a much more user friendly way.
A Determination of Material Properties of Flexible Structures Using EMA and FEM Analysis
Authors: Duris Rastislav
Published: December 2014

Dynamic behavior of mechanical structures results from complex interactions between applied forces and the stiffness properties of the structure. Currently, many problems of structural dynamic analysis are solved using Finite Element Method (FEM). However, in recent years, the implementation of the Fast Fourier Transform (FFT) in low cost computer-based signal analyzers has provided a powerful tool for acquisition and analysis of vibration data. This article discusses combination of two approaches to structural dynamics testing; the experimental part which is referred to as Experimental Modal Analysis (EMA), respectively the analytical part, which is realized by Finite Element Analysis (FEA). Main goal of the paper is calculation of material properties from experimentally determined modal frequencies.
Kinematical Analysis of Gearboxes with Spiroid Gears
Authors: Riečičiarová Eva , Bučányová Marcela
Published: December 2014

The paper investigates the issue of the asymetric worms´ profile (Fig. 10) of the spiroid gear comprising the direct line worm surface which occurs by the motion of the constituent direct line u upon the helix regarding the steady-state coordinate system 0 (x,y,z).
There are described the characteristic attributes of spiroid gears in the article. Some kinematical inaccuracies caused by mistakes in gearing assembly are analyzed there. A testing stand is supposed to carry out an experimental research of inaccuracies influence on smooth run of machine aggregate.
Influence of the Position of Ignition Source on the Raw Materials Used to Produce Biofuel in Form of Wood Pellets
Authors: Horváth Jozef , Balog Karol , Chrebet Tomáš
Published: December 2014

The aim of present work is monitoring thermal decomposition tested samples depending on distance of ignition source, subsequent generation of flame and flameless combustion. Tested samples are used to produce biofuel in form of pellets, which can be made of spruce wood (Picea excelsa, L.) and beech wood (Fagus sylvatica) and have a direct effect on the properties of these pellets. Measurements are carried out according to standard STN ISO 871:2010 Determination of ignition temperature using a hot-air furnace. External ignition source (electrically heated spiral of the wire canthal) is used to analyze different conditions of test samples. Distance between external ignition source and tested samples is 10, 50 and 90 mm. The experiments are performed at an air flow rate 38, 25, 12,5 and 0 mm.s-1. The results show the rate of loss of weight and the flow rates of the material of the test samples at the different test conditions.
Verification of Tin Car Body Production by Unconventional Stamping Method
Authors: Tomáš Miroslav , Hudák Juraj , Draganovská Dagmar , Ižol Peter
Published: December 2014

The contribution deals with verification of tin car body production using single action experimental stamping die. Two methods of car body production were verified - the first one used open die made of tool steel and the second one used closed die made of tool steel with Fibroflex at the bottom of the die. The tin steel sheet TS 245 with thickness 0.28 mm had been used for the car body production. The shapes of pressings were evaluated using the photogrammetric 3D measuring system ARGUS. The ARGUS optical system allowed evaluating the wall thickness change and the deformation on the surface of pressings as well. These values had been compared for both method of the tin car body production.
An Investigation of Springback in Sheet Metal Forming of High Strength Steels
Authors: Slota Jan , Jurcisin Miroslav , Spišák Emil , Sleziak Tomas
Published: December 2014

Redistribution of residual stresses in a stamped sheet metal leads to the springback phenomenon. Springback phenomenon is well predicted for some mild steel materials, but not for steels with higher strengths. Nowadays, one of the most used tools to stamping optimization is usage of numerical simulations. In this paper was investigated sheet metal behavior under cyclic tension-compression test. Special fixture which serves as a buckling prevention of sheet metal in the compression phase of measuring stress-strain curve was designed. Obtained stress-strain curve was used to the definition of kinematic hardening model in numerical simulation. This model was verified with the real experiment in deep drawing process.
Response of Fiber Reinforced Composite Structures to Ballistic Loads
Authors: Pelagić Zoran , Dudinský Martin , Žmindák Milan
Published: December 2014

Explosion and high velocity impact are typical ballistic loads of structures. This paper describes the problem of wave propagation in solid rocket booster part. Such waves originate by acting of explosion waves or by high velocity impact of solid parts on the structure. Computational simulations are applied to the problem of propagation of shock waves in a composite material reinforced by carbon fibres which are supposed to be much stiffer than the matrix. The shock wave in such material is influenced by reflexion and refraction on the interface between fibres and the matrix and by the interaction of then waves. The shock wave is strongly damped in such composites in this way. In the present study, the response of composite laminates under velocity impact loading will be investigated using MATLAB and ABAQUS software.
Influence of Stress Mode on Failure Micromechanisms of Nodular Cast Iron
Authors: Vaško Alan , Vaško Milan
Published: December 2014

The paper deals with comparison of the failure micromechanisms of nodular cast iron at static, impact and fatigue stress. Several specimens of ferrite-pearlitic nodular cast irons with different content of ferrite in a matrix were used for metallographic analysis, mechanical tests and microfractographic analysis. Mechanical properties were found out by static tensile test, impact bending test and fatigue tests. The microfractographic analysis was made with use of scanning electron microscope on fracture surfaces of the specimens fractured by these mechanical tests. Fracture surfaces of analysed specimens are characteristic of mixed mode of fracture. Failure micromechanism of nodular cast irons is dependent on mode of stress.
Impact of Open Cell Bi-Component Structures on Distribution of Temperature Fields
Authors: Seidl Martin , Šafka Jiří , Bobek Jiří
Published: December 2014

This article is focused on analysis of impacts of cellular structure on even heat distribution and heat removal rate from surface of the bi-component experimental part with using cooling potential of liquid technical gases. Experimental part had bi-component core/shell structure and both components were made of the same metal material. The only difference between them was their structure. The shell component of experimental part had compact and consistent structure. The core either had the same structure as the shell layer or it was created using fractal patterns with microporous structure of open cell character. Porosity influence on temperature field distribution on the part surface was assessed in two levels distinguished by different sizes of fractal patterns.
Design of the Tool for Production of Ear Ventilation Tubes
Authors: Hnátková Eva , Dvořák Zdeněk , Zlýnský Vladimír
Published: December 2014

This work deals with a development of a tool for ear ventilation tube production. Ear tubes are medical devices, which allow ventilation and provide pressure equalization in the middle ear cavity for prolonged period of time; in case of repetitive inflammation. These implants are normally made from metals or classical polymeric materials. Whereas, today, the effort is to develop bioresorbable tubes based on polylactic acid, which could replace currently used material. The benefit provides no requirement of secondary surgery for their removal. The size of ear implants is only in millimetres and the tool for their manufacturing requires a special technology. In this paper, two tubes and a transfer mold for their production was designed using 3D CAD software Catia V5R18. Subsequently, the special manufacturing process for the mold cavity plates using the rapid prototyping and electroforming technology was proposed. The designed tool is intended for biodegradable tubes, which will be further tested in the laboratory.
Dynamic Balancing of the Threshing Drum in Combine Harvesters – The Process, Sources of Imbalance and Negative Impact of Mechanical Vibrations
Authors: Krolczyk Jolanta B. , Legutko Stanislaw , Krolczyk Grzegorz M.
Published: December 2014

The purpose of this article is to present the description of the process of the dynamic balancing of threshing drum in combine harvesters as well as the sources of imbalance. The dynamic balancing analysis was carried out in production facility on dynamic balancing machine. Dynamic balancing of slats of the combine harvester threshing drum was determined by reference to the specified mass dynamic unbalance. The article also presents the influence of unbalanced machine elements on the human body.
Influence of Technological Cutting Parameters on Surface Texture of Austenitic Stainless Steel
Authors: Krolczyk Grzegorz M. , Legutko Stanislaw , Maruda Radoslaw W.
Published: December 2014

The paper presents the contribution in engineering of surfaces particularly in surface texture of Austenitic Stainless Steels. The objective of the investigation was to determine the surface texture of austenitic stainless steel after turning with coated carbide tool point. The investigation included geometrical parameters of Surface Integrity for different technological cutting parameters in dry turning process of austenitic stainless steel. The article presents the surface roughness parameters with the roughness profiles (irregular slopes). The percentage of isotropic surfaces and Bearing Area of ​​Primary Model. Analyses were performed for variable cutting parameters. An Infinite Focus Measurement Machine (IFM) was used for the surface texture analysis. The study was performed within a production facility during the machining of electric motor parts and deep-well pumps.
Another View of the Product Life Cycle
Authors: Pelantova Vera
Published: December 2014

Every person is surrounded by different things with various time of consumption. The most of people sees a product life cycle from a marketing point of view. The product has got to prosper on the market place and to earn money for the organisation and to be cheap for the customer. However, the market has changed dramatically. Organisations have not adapted on these conditions yet. The article tries to assess different views on the product life cycle according to publications. The need of an adjustment of the product life cycle is described here with regard to the process approach in management systems of organisations. Another resource of knowledge for products is based on years of observation of the nature. There are also discussed general requirements for the product from a common domestic customer. The goal of this article is to contribute to a new approach to the product life cycle, which includes all these aspects. Products have to get closer to the concept of the sustainable living as a way overcoming of the crisis. They can not be conceived only grossly economically.
Education Company – An Experience from the Implementation of Problem Based Learning
Authors: Manlig František , Koblasa František , Šlaichová Eva , Pelantova Vera , Vavruška Jan
Published: December 2014

Considerable pressure on quality of the business processes, their continual improvement and increasing of their efficiency is reflected in the requirements on graduates of technical universities and hence the educational systems. According to the industrial sector demand the "process" holistic thinking is being more and more discussed. It emphasizes the practical form of the teaching.The current challenge is becoming the Problem Based Learning (PBL) and its potential to gain truly practical experience in solving problematic tasks. PBL is thus getting involved into the teaching plans of more schools.The paper briefly discusses the innovative educational concept of "Learning Company" (EduCom). The concept is based on the current requirements of the industry on recruited employees and introduces the elements of problem-oriented teaching. The aim is to link the selected tutorials into a single project where the outputs of one course are the inputs of another course.The paper describes the existing experience with introducing the concept, its benefits, but also the problems that workers encountered. The planned activities for the development of the described concept will be mentioned as well.
The Possibilities for Increasing Production Processes Efficiency by Utilizing the Lean Manufacturing Principles
Authors: Klabusayová Naděžda
Published: December 2014

The paper deals with the issue of increasing production processes efficiency, stabilization and also increasing the labor productivity through the implementation of lean manufacturing principles. Waste reduction and increase in the efficiency of manufacturing processes is a long-term, systematic matter, which requires the utilization of appropriate methods and methodologies. Therefore, this papers points out the growing importance of utilizing certain methods and principles which lead to the reduction of inefficient costs. The Value Stream Mapping (VSM) method, which can quickly point out existing reserves and provides an effective platform for the evaluation of lean manufacturing and Overall Equipment Efficiency (OEE) method, which evaluates the effectiveness of used manufacturing equipment are, both analyzed in detail.
Offline Programming of an ABB Robot Using Imported CAD Models in the RobotStudio Software Environment
Authors: Holubek Radovan , Delgado Sobrino Daynier Rolando , Košťál Peter , Ružarovský Roman
Published: December 2014

Current trend in automation area is focused to the innovation in all fields of the technologies and technological devices. Probably industrial robots and manipulators belong to development too. Industrial robots and manipulators belong to progressive elements of automation. Modern concept uses the offline programming as a tools integration of the virtual CAD models into programming environment. Offline programming carries a lot of advantages for example possibility of the programming without real robot system, possibility of the collision state debugging. Implementation of CAD models in virtual environment of Robot studio achieves better workplace station of creating robotic system and also it generates rather trajectories of the robot path in this system.
Interval Censored Data Analysis with Weibull and Exponential Distribution
Authors: Nánási Tibor
Published: December 2014

Interval-censored data result from incomplete observation of random variable when the values are known only to lie in an interval, instead of being observed exactly. The method of Maximum Likelihood Estimation is used to assess the parameters of the supposed distribution. Unlike in case of Weibull distribution, for regular test schedule of exponentially distributed data a closed formula is derived. Due to surprising simplicity the derived formula is open to direct interpretation in terms of observed input information.
The Methodology Proposal for the Model-Oriented Safety Analysis of Dynamical Systems
Authors: Strbo Milan , Tanuska Pavol , Gese Augustin , Smolarik Lukas
Published: December 2014

The aim of the article is to propose a methodology for implementing a model-driven safety analysis of dynamical technology systems. The safety analysis is performed in the process of control system development, especially aiming at safety-critical processes of system operation. The methodology was divided into six basic steps. The individual steps of the methodology are carried out in a hierarchical sequence. Further, roles of individual methodology steps are detailed. In the next part of the article, the principle of safety-critical process monitoring based on models is described.
The Dynamical Systems Safety Analysis by SQMD Method
Authors: Tanuska Pavol , Strbo Milan , Gese Augustin , Zahradnikova Barbora
Published: December 2014

The objective of the article is to demonstrate the principle of the SQMD method concept for performing safety analysis on the example of a dynamical system. The safety analysis is performed in the process of designing a control system for safety-critical system processes. The safety analysis is aimed at using the models to monitor different critical points of the system. For the purpose of modelling, we suggest using the SQMD method combining qualitative and quantitative procedures of modelling and taking both methods advantages.
Automation of Force Assessment Generated by Upper Limb for Ergonomic System EAWS
Authors: Ondriga Lubos , Michalconok German
Published: December 2014

Ergonomic assessment systems were created for possibility of prediction and risk detection at workplace. Ergonomic assessment system EAWS (European Assembly Work-Sheet) includes assessment of body postures, action forces, weight of carrying loads and frequently recurring upper limb loads assessment. Assessment of action forces (forces generated by upper limb defined by EAWS) is problematic and there is a lack of means for effective assessment. This paper deals with design of electronic device for assessment of action forces generated by upper limb defined by EAWS with using of thin film FSR (force sensing resistor). The paper deals with identification of upper limb areas, where the generated forces are important for assessment by EAWS, deployment of sensors in identified areas, calibration of FSR sensor with regard to simply program implementation in microcontroller, determination of action forces in every by EAWS defined action force application and construction of sensing and evaluating part of electronic device.
Research on Trojan Detection Method of Computer Memory Mirroring
Authors: Zhao Meng Meng , Wang Lian Hai
Published: December 2014

Trojan detection plays an important role in the discovery and treatment of Trojans. Acquisition and analysis of memory mirroring is a new research topic of computer live forensics. Computer forensics often need Trojan detection to determine whether target machine has been controlled. This paper proposed a Trojan detection method based on computer live forensics. Construct probabilistic fuzzy cognitive map(PFCM) through analysis of memory mirroring, use memory mirroring Trojan detection algorithm, calculate the probability of the existence of Trojan. The results showed that this method can effectively determine whether there were Trojan in memory mirroring. Detect Trojans through the analysis of various aspects of memory and numerical computation, proposed method improve the accuracy and reliability of Trojan detection.
Study on Data Security Technology of Neural Network System
Authors: Hong Yan Wei
Published: December 2014

This paper analyzes the neural network algorithm model, introduces the basic principles and training process of BP neural network algorithm, analyzes the BP neural network weights adjustment processand the method of determining the number of nodes in each layer; in improved protocol algorithm basis LEACH-E, combined with the BP neural network algorithm, we propose a new data fusion algorithm BPDFA to reduce energy consumption to attain the network lifetime goal.
The Research and Design of Multi-Source Data Exchange System Based on Middleware Technology
Authors: Li Wei Wei , Zhou Cheng
Published: December 2014

To resolve the complexity and diversity of data exchange, the paper designed an data exchange system based on middleware technology, which realized different parsing and filtering capabilities. The method can meet the need of data exchange on the premise that network security can be guaranteed. The test results show that functionality and performance of the system meet the requirements of data isolation and exchange.
A Reverse Hilbert's Type Inequality
Authors: Xi Gao Wen , Xi Yue , Wang Lei
Published: December 2014

In this paper, by using the Euler-Maclaurin expansion, we establish an inequality of a weight coefficient. Using this inequality, we derive a reverse Hilbert's type inequality. As applications, an equivalent form is obtained.
Constructing a Web System Presentation Layer Framework Based on MDA
Authors: Deng Ming , Xie Xiao Lan
Published: December 2014

MDA(Model Driven Architecture)[1] is model-centric software development methodology. Comparing to traditional code-centric method, MDA is closer to real applications, and it owns a higher level of abstraction. It has become an effective way to produce large scale software in heterogeneous environment, and it is widely used to develop web-based complex information systems [2]. Our paper applies MDA approach to design web system representation layer framework with instances, and extend UML model by MOF(Meta-Object Facility). We’ve also defined transform rules and realized the conversion from UML model to Web model. Our framework helps minimize the application code, reduces the dependence of the Servlet API, provides extensible interface, thus improve the efficiency of system development and maintenance.
The Implement of Java Calling C++ Program by JNI Technology
Authors: Ji Wan Jun , Qiao Xu , Xia Yun Hai
Published: December 2014

More and more enterprises are going to expand the business to the Internet and mobile terminals, at the same time, they are unwilling to give up the traditional applications not written in java, so questions come. The author has a deep research on JNI in java during the process of solving problems. This article simply introduces the JNI technology, and combines with the concrete instance to complete JNI cross-platform calling for VC++ program that reflects the using value of JNI technology.
Power Efficient Port Assignment for Connection Provision in IP-over-WDM Optical Networks
Authors: Du Shu , Xu Ze Hui , Wang Hai Tao , Peng Wei Fu
Published: December 2014

In the IP-over-WDM networks, electric power is more consumed at IP layer. This letter proposes two power-saving dynamic connection provision algorithms, called Most Used First (MUF) and State Transmission Time Aware (STTA) respectively, which can direct the incoming connection request to already provisioned router line cards and chassis, and hence reduce the number of active IP devices so to save electric power. For a typical network, MUF and STTA can save over 3% and 7% power respectively comparing with conventional power-unaware approach.
Quantum Fuzzy Classification Hashing Algorithm with the One-Time Pad Security Properties
Authors: Cao Dong
Published: December 2014

We propose a new method of quantum fuzzy classification hashing scheme constructed from the method of quantum information processing. Based on the uniform random fuzziness of the template set produced by the quantum fuzzy classification hashing, Security of the identification scheme is equivalent to one-time pad. Compared to the construction schemes based on similar method, the novel quantum fuzzy classification hashing scheme has a more simplified structure. Our algorithms have outstanding data security and validity. Theoretical analysis shows that the quantum fuzzy classification hashing can effectively resist the attack of quantum computation.
On Data Security and Encryption Algorithms in Cloud Environment
Authors: Zhang Xin  Zheng , Zhang Ya Juan
Published: December 2014

As information and processes are migrating to the cloud, Cloud Computing is drastically changing IT professionals’ working environment. Cloud Computing solves many problems of conventional computing. However, the new technology has also created new challenges such as data security, data ownership and trans-code data storage. We discussed about Cloud computing security issues, mechanism, challenges that Cloud service providers and consumers face during Cloud engineering. Based on concerning of security issues and challenges, we proposed several encryption algorithms to make cloud data secure and invulnerable. We made comparisons among DES, AES, RSA and ECC algorithms to find combinatorial optimization solutions, which fit Cloud environment well for making cloud data secure and not to be hacked by attackers.
Impedance Matching Using the Smith Chart
Authors: Yu Jie , Dong Wen
Published: December 2014

Impedance matching is a basic requirement for high frequency signal transmission, but also a relatively complicated aspect in circuit design. In this article, from the perspective of impedance matching, structure principle and characteristics of Smith chart are introduced. On the basis of Smith chart software, its process of impedance matching is described with a simple example to show the advantages of convenient and fast calculation of Smith chart for impedance matching.
Some the Application of the Taylor Series for the Analysis of Processes in Non-Linear Resistive Circuits
Authors: Pivnev Vitaly Viktorovich , Basan Sergey Nikolaevich
Published: December 2014

The way of calculating the currents and voltages in nonlinear resistive electrical circuits , based on the use of power series (Taylor, Maclaurin) is considered . The advantage of this method lies in the fact that while it implementation it is not necessary to a system of nonlinear equations. To determine the numerical values ​​of the coefficients of the power series corresponding system of linear algebraic equations are solved. Nonlinear operations are limited to the calculation of the numerical values ​​of currents, voltages and their derivatives with respect to the pole equations of nonlinear elements.
The Effect of Thermal Resistans on IC-VBE Fly-Back Characteristic of Power SiGe Heterojunction Bipolar Transistor
Authors: Chen Liang
Published: December 2014

The effect of thermal resistans onIC-VBEfly-back characteristic of power SiGe heterojunction bipolar transistor is studied through theoretical analysis, computer simulations, and experimental measurements. It is found that a suitable thermal resistans can make the collector current achieve the second fly-back point before transistors are burned-out, and then returns to a stable situation. Such a thermal resistans is beneficial to the thermal stability. When the thermal resistans is small, the curve ofIC-VBEfly-back characteristic of HBT has no fly-back point. While the thermal resistans increases, the curve ofIC-VBEfly-back characteristic of HBT has two fly-back points.
A New Trip Fault of Transmission Line Caused by Lightning Striking to Ground Wire and Conductor Simultaneously
Authors: Wu Qing , Qian Guan Jun , Hu Bin , Huang Song , Dou Xian He , Pei Hao Wei
Published: December 2014

Lightning strokes are the main cause for the trip fault of transmission line with a rated voltage of 110 kV and above. The counterattack trip and the shielding failure trip were thought to be the two kinds of fault type caused by lightning strokes. According to the development process of the two fault types, a few effective lightning protection methods are proposed. However, there is no relative report about the case that the ground wire and the conductor are stricken simultaneously. Therefore, no specific protection method is presented. In this paper, the possibility of the both stroke is analyzed, according the the mechanism of lightning stroke and the characteristics of lightning strokes. Then, a series of simulation test were designed and carried out. The observation results recorded by high-speed camera indicate that the downward leader could strike grounded wire and conductor simultaneously. At last, based on the intelligent monitoring system of transmission line, the traveling wave current of a lightning stroke was recorded. And after comparing the current with the simulation results by ATP/EMTP, the stroke was thought to be a both stroke. The photos in the fault point indicate that there are discharge points both on the grounded wire and conductor. And this field data clarified that the trip fault was caused by both stroke. A new lightning stroke fault was presented and verified in this paper, this report will supply important reference for lightning protection of transmission line.
Research on Fault Identification Technology of Jumper Windage Yaw Flashover
Authors: Wu Qing , Hu Bin , Qian Guan Jun , Huang Song , Chen Qin Zhu , Dou Xian He , Pei Hao Wei
Published: December 2014

jumper has been weakness of protection of windage yaw flashover in Grid, timely and effective identification method of windage yaw flashover is lacked in the existing power system; focusing on the point that less jumper windage yaw flashover, the phenomenon of jumper windage yaw flashover is explored, by checking windage yaw angle and the minimum air space under strong wind, to confirm the possibility of jumper windage yaw flashover caused by strong wind; by mining the law of the jumper windage yaw flashover, and applying the fractal theory calculation, the electromagnetic transient characteristics of transient current travelling waves is studied, to propose a jumper windage yaw fault identification method based on the similarity of transient current travelling waves, which is successfully applied to Hainan Power Grid’s Fuguan line jumper windage yaw flashover in 2011.
Experimental Circuit Design on Electromagnetic Actuator for Vehicle Active Suspension
Authors: Lai Fei
Published: December 2014

Based upon the designed cylinder type structure of electromagnetic linear actuator for vehicle active suspension, the drive circuit of the tubular electromagnetic linear actuator and the dead zone unit were designed. By the AutoBox dSPACE control system and the intelligent power module IPM, the main power circuit was built up, and the simple test platform was also built up. Through the test platform, the square wave force and triangle wave force experiments were tested. Through the test, it shows that the drive circuit design of the electromagnetic actuator is feasible.
Structure Optimal Design Based on Distributed-Current-Feed Mode Oriented to Electromagnetic Launching System
Authors: Zheng Yu Feng , Jiang Han Hong , Lu Jun Yong
Published: December 2014

Controlling the output current characteristic of the pulsed power system is the important approach to optimize the parameters and to heighten the system efficiency in the Electromagnetic Launching System. For enhancing the system performance, distributed-current-feed style is introduced. A distributed current feeding-in model is established and the characteristic and performance is analyzed. Stimulation depicts:1)adopting the distributed feeding style results in more efficient than the central feeding style ;2)employing the new method of distributed-feed-timing-discharging goes a step further to heighten the muzzle velocity. The new model is meaningful to optimize the structure of the electromagnetic launching system, and is effective to the design of the launcher and current-feeding-in system.
The Application of Optical Communication in the Sub-Module Design of Modular Multilevel Converter
Authors: Lv Dong , Li Feng Wei , He Xiao Jian , Huang Lei
Published: December 2014

With the sub-module number and scale growing on, the whole control system of MMC (Modular Multilevel Converter) tends to be much more complicated because of the cascade structure, which also intensifies the pressure of the converter main controller. To distribute the converter main controller’s task, the design of sub-module tenders itself extremely important. However, there is no explicit and comprehensive study on how to design the sub-module. This study, according to the characters of MMC, introduces a feasible architecture of hardware and software for the sub-module with optical communication. Each sub-module has its own independent controller and control system. That is to say, every sub-module is a complete system, which can do calculation and communication with outside. Sub-modules connect with the main controller of converter through communication using optical fibers. By adopting the optical communication, sub-modules not only can receive the control references data from the main controller, but also can send its own condition information back, which creates an interactive communication between the two sides. Additionally, through detailed experiments, the validity and feasibility of the design are demonstrated under two different control strategies.
Experimental Investigation on Multi-Unit Parallel-Flow Type Condenser with Flat Tubes Distribution
Authors: Zeng Lv Xian , Zheng Zu Yi , Wan Jun Hua , Chen Xi , Wan Zhong Min , Tan Jing Ying , Liu Jing
Published: December 2014

Three heat exchangers, all of which have 38 tubes in total and 6 passes, with different tube arrangements were manufactured to be experimental investigated in laboratory. The effect of flat tube distribution on heat transfer performance and pressure drop characteristic was experimental investigated. The effect of different air velocity and flow on heat transfer performance and pressure drop characteristic was also experimental investigated. The results show that similar tube distribution has little effect on heat transfer quality but has great effect on pressure drop. It was found the third arrangement has the best heat transfer and its pressure drop is small. Thus the third arrangement is the best solution. The heat transfer and pressure drop increase with the air velocity and refrigerant flow, so a proper value should be chosen, it was found that the simulation results were mainly agreement with the experimental results.
Research on Distributed Magnetic Circuit Calculation of Halbach Magnetized Permanent Magnet Generators
Authors: Wei Kun , Wang Dong , Chen Jun Quan , Yu Xi Wen
Published: December 2014

Because of the flexibility and clear physical concept, magnetic circuit calculation method (MCCM) is preferred during the early stage of the electromagnetic design of generators and motors. Based on the analysis of magnetic field distribution in halbach magnetized permanent magnet generator (HMPMG) by finite element method (FEM), this paper proposes a distributed magnetic circuit calculation (DMCC) for HMPMG. Because of the low permeability of permanent magnet (PM) material, the DMCC for HMPMG is quite different from that for electrical excitation generator. By dividing half-pole generator model into sub-sections along radial and circumferential direction with circumferential equi-interval nodes in air gap, the DMCC for HMPMG employs iteration to calculate magnetic flux density on air gap nodes. In the end, the validity and accuracy of DMCC are proved by FEM.
Evaluation of Car-Following Models Based on Measured Data from Real Traffic
Authors: Wu Ji Qun , Li Shuang Ke
Published: December 2014

In this paper, we evaluate several typical car-following models based on actual measurement data from real traffic condition in Xi’an city by presenting a visual comparison between real and simulated value of the velocity for vehicles. We find that FVDM can depict the real velocity change accurately. Besides, some popular models such as OVM, GFM and OV-DM are not very suitable for real traffic simulation in Xi’an city, although they can represent some traffic phenomena under certain condition.
Design of Light Control Curtain System in Smart Home
Authors: Yang Jiu Hong
Published: December 2014

To make a building structure beautiful and obtain a good daylighting, the windows become more and more big. It is inconvenience for the opening and closing of the bigger curtain. The frame structure of automatic control curtain is designed and manufactured, as well as DC motor drive, light detection, preventing over-wind, curtain position detection circuit. The corresponding control programs realize the automatic control function of curtain. Automatic curtain system contains three kinds of mode. Manual mode is the basic function of automatic curtain system. The wireless remote control function provides convenience for the user to control the opening and closing of curtain. Automatic light sensor model realizes the automatic control of curtain, according to the brightness of the light. The sensitivity of light sensor can be adjusted by artificial to make the customer satisfied. The open degree of curtain can be manual adjusted to meet the requirements of the various length of the curtain. The system is simple and practical. Its energy consumption and cost is low. As a part of the smart home, the system is suitable for opening and closing control of the curtains and provides the convenience for people's daily lives.