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Electronics Technology: Meeting the Challenges of Electronics Technology Progress, 2004. 27th International Spring Seminar on

Date 13-16 May 2004

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  • Implementation and evaluation of an e-learning architecture based on MSClass Server

    Publication Year: 2004 , Page(s): 506 - 509 vol.3
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    In this paper, we present the design, implementation and evaluation of an e-learning architecture with integrated Microsoft Class Server technology. The accent is put on the architecture, defined in the paper as "adaptive mechanisms in learning technology architecture based on MS Class Server". The ongoing evaluation process, taking place with 120 2nd year full-time students has been described. The pilot discipline, used to evaluate the architecture, is "electronic circuits theory", part of the main curricula in the Department of Electronics at the Technical University of Sofia. View full abstract»

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  • Models Of Technology And Change In Higher Education

    Publication Year: 2004 , Page(s): 500 - 505
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  • University-industry network

    Publication Year: 2004 , Page(s): 510 - 514 vol.3
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    In this paper we present the current initiatives, related to the university-industry partnership. We describe the use of integrated information systems to enable access to modern information and communication technologies (ICT). The complementary aspect of the same trend is to organize international cooperation, leading to IT education aimed at applying the best technologies available as well as conforming to the modern standards for e-learning. View full abstract»

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  • Classification, parameters, characteristics and application of matrix semiconductor photoconverters

    Publication Year: 2004 , Page(s): 444 - 447 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (150 KB) |  | HTML iconHTML  

    During the past few years, new matrix semiconductor photoconverters were introduced. These are the so called super CCD matrices that exceed conventional CCD matrices in some major parameters. Traditional and new matrix photoconverters have been considered in this paper; however, more attention has been given to the new ones. View full abstract»

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  • Automated system for temperature measurement and regulation using I-7012 module

    Publication Year: 2004 , Page(s): 429 - 433 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (411 KB) |  | HTML iconHTML  

    The paper presents a PC-based temperature measurement and regulation system. The automated system for temperature regulation uses the I-7012 module for data acquisition and control signal transmission. Communication between the data acquisition module and the computer controller is made by an RS-485 interface that provides the possibility to realize a remote measurement and control system. Controller function and graphical interface software are implemented in Visual C, which provides the system with good flexibility. For comparison, the same application was developed in LabVIEW, a graphical programming language that provides a very simple way to design an application, which is easy to understand for less experienced programmers. View full abstract»

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  • Models Of Technology And Change In Higher Education & University - Industry Network

    Publication Year: 2004 , Page(s): 0_15 - 0_16
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  • Formal models for system design (challenges on exchanges in the main role between hardware and software going to the systems packaging)

    Publication Year: 2004 , Page(s): 564 - 568 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (253 KB) |  | HTML iconHTML  

    This paper envisages main trends in systems design. Observation over and comparison between paradigms in software and hardware design is presented. Finally the paper focuses on three of most popular and important hardware design languages VHDL, SDL and SystemC. A special stress is done on how do they work outside hardware design and how they do package software and hardware in one device. View full abstract»

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  • Extended differential long-term predictive universal coding

    Publication Year: 2004 , Page(s): 476 - 480 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (204 KB) |  | HTML iconHTML  

    In this paper, we propose an extended differential pulse code modulation (DPCM) method for sources with unknown parameters (of any theoretical class). The main features of the method are long-term prediction and backward adaptation by forward analysis with a dynamically adjustable prediction precision criterion. The predictors of the encoder and the decoder are synchronized by commands via a logical pipe. The proposed structures can be implemented thoroughly in hardware. View full abstract»

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  • Remote sensing of position and acceleration

    Publication Year: 2004 , Page(s): 413 - 416 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (208 KB) |  | HTML iconHTML  

    Acceleration and position transducers are one of the most widely used sensors for monitoring civil engineering structures, mechanical devices, industrial process systems and even biomedical systems. One of the main issue in designing instrumentation with such sensors is the ability of remote interaction in order to reduce as much is possible any interference with the measured physical value. This statement usually implies the use of low power embedded systems for acceleration and position sensing and wireless data transfer for acquiring relevant readings. This paper proposes a low power embedded sensing system for acceleration and position based on a common capacitive transducer. The system integrates in one single chip the signal conditioning blocks (for the transducers), the analog-to-digital converter and a fast infrared communication module for data transmission. The proposed solution increases the possibility of integrating arrays of such low-cost sensors in remote sensing network systems for acceleration and position, allowing an increased accuracy and performance for all interested domains of application. View full abstract»

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  • Analog array - a new concept for enhanced microelectronic engineering education

    Publication Year: 2004 , Page(s): 515 - 524 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (385 KB) |  | HTML iconHTML  

    The basic goal of this paper is to propose a concept (chip architecture and circuitry) for simple and effective demonstration and learning of basic principles of analog integrated DC and amplifying circuits and blocks. It is intended for bachelor and master degree programs in analog integrated circuit design, microelectronics and computer aided design courses. View full abstract»

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  • Low-voltage FIR filter for receivers used in communication systems

    Publication Year: 2004 , Page(s): 434 - 438 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (199 KB) |  | HTML iconHTML  

    The paper presents the principle and a possible implementation for an improved finite-impulse response (FIR) filter intended to be used with receivers operating in low voltage supply conditions. Basically, the main application of this filter is in the equalizer building block of a wireless receiver. To provide the filter with simple programmability through digital words, current dividers based on MOS transistors are included in its structure. Also, a very important block of the presented filter includes sample/hold circuits that must work at the same low supply voltage as the entire system. Low voltage operation of the proposed filter is achieved using the switched current technique. View full abstract»

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  • Design of low power automotive interface

    Publication Year: 2004 , Page(s): 377 - 382 vol.3
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (369 KB) |  | HTML iconHTML  

    The LIN (local interconnect network) is a 12 V serial communications protocol which efficiently supports the control of mechatronic nodes in distributed automotive applications. The transfer speed is up to 20 kbit/s. The author represents the design of a hardware LIN module (master/slave), which is based on a XILINX programmable logic devices implementation. A top-down approach has been used during the design stage and VHDL has been applied for the design description. The LIN module has been tested on a development platform including a small LIN network (one master and two slave-LIN units). View full abstract»

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  • Differences between solder bonds made with SnPbAg and SnAgCu solders

    Publication Year: 2004 , Page(s): 467 - 470 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (326 KB) |  | HTML iconHTML  

    Due to legislation and market trends, every electronic appliance assembler has to change leaded solders to lead free. In recent years, a number of manufacturers were simply waiting, and they know little or nothing about the behavior of lead free solders. However, there is now a necessity for lead free solders because the RoHS and WEEE directives are coming into effect by July 2006. To bring to light the particular differences between widely used industrial SnPbAg and SnAgCu solders, a test PCB for conventional SMT devices was designed and experimental soldering was done by IR reflow technology with both alloys. View full abstract»

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  • Automated system for selecting optimal technological variant and design of passive elements in hybrid micro modules

    Publication Year: 2004 , Page(s): 535 - 539 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (324 KB) |  | HTML iconHTML  

    A program module for selection of an optimal technological variant during design of hybrid micro modules has been developed. It allows the opportunity to solve the optimization problem based on the available technology materials, elements and scheme. The selection of the combination of weight coefficients that describe the efficiency of the result and visualization of the hybrid micro modules (HMM) facilitates the attainment of an optimum technological variant during the design phase. The results are compatible with Cadence by means of exporting the script file. View full abstract»

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  • Polymer microwave absorber with nanosized ferrite and carbon fillers

    Publication Year: 2004 , Page(s): 577 - 579 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (175 KB) |  | HTML iconHTML  

    The paper presents studies on the microwave properties of two types of polymer composites based on acrylic resin and polyurethane with nanosized magnetic (magnetite) and dielectric (carbon) fillers. The microwave (MW) absorption was measured at 9.4 GHz, while the dielectric and magnetic properties were investigated in the frequency range 1-18 GHz. Promising MW absorption properties were observed for nanostructured filler applications in comparison with the traditional MW absorbers. View full abstract»

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  • Design of electronic hardware using VHDL described with the example of baseband and LMP layers in Bluetooth

    Publication Year: 2004 , Page(s): 453 - 456 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (383 KB) |  | HTML iconHTML  

    Each network device or portable device with HOST interface (radio or cable) has several hierarchical structures which distribute functionality between different layers of that device. Bluetooth is a radio interface which support this architecture. There are five mandatory layers of hierarchy defined: radio interface; baseband layer; link manager protocol (LMP) layer; logical link control and adaptation protocol (L2CAP) layer; HOST user interface. The paper describes the design of the digital baseband and LMP layers from the hardware development aspect of network algorithms. The baseband layer performs the functions related to interface interaction between the Bluetooth chipset and an external or integrated radio chip and a host system. In baseband, different modules for data processing are integrated, like modules for generating frequency hopping sequences, fast error correction codes, cyclic redundancy check algorithm, whitening, data packet assembling and de-assembling. In addition, some hardware optimizations have been made to meet the requirements of modern electronics. By reason of a higher degree of design abstraction, the development of the module has been done with hardware description language $VHDL. During development of the Bluetooth module, a new complex architecture is integrated; it supports low cost upgrades related to new generations of Bluetooth devices. The design has been provided with a generic microprocessor interface for easy adaptation in the Bluetooth system. View full abstract»

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  • New technology for recording the information based on intramolecular bonds in water

    Publication Year: 2004 , Page(s): 569 - 573 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (272 KB) |  | HTML iconHTML  

    A new technology for recording information based on the discreet spectrum of the intramolecular bond energies in water is described. For the latter the existence of a space net of bonded with H-bonds molecules with approximate tetrahedral symmetry is supposed. The discrete character of the water energy spectrum is proved by the measurement of the surface tension variations of evaporating water drops. Using the Shannon's formula, a new term information spectrum of water is introduced, in which the information related to one pair of water molecules as a function of the discrete values of the intramolecular bond energies is represented. The experimental results showing why this information spectrum as a method registered the weak physical and chemical influences on the water are represented. View full abstract»

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  • Nanoscale materials - production, properties and applications

    Publication Year: 2004 , Page(s): 540 - 542 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (165 KB) |  | HTML iconHTML  

    A well known method for the preparation of nanomaterials is the chemical reduction of metal ions, dissolved in water, with an aqueous solution of an alkali metal borohydride as the reduction agent. This method has been used to produce various compositions of nanoparticles, nanowires, nanoscale hydrogen containers, etc. The knowledge and the comparison of date for the bond strength of various diatomic molecules help us to choose proper combinations of elements in order to synthesize nano-systems with pre-requested properties. View full abstract»

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  • Influence of information technology on military radar systems

    Publication Year: 2004 , Page(s): 557 - 563 vol.3
    Cited by:  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (443 KB) |  | HTML iconHTML  

    The paper discusses influence of information technology (IT) on military radar systems and how this impacts upon conducting military operations. Applications of new technologies in three basic areas of military radar systems are considered: surveillance and automatic target recognition systems; tracking systems and data and signal processing. Some possible uses of radar data are shown along with how this will improve the efficacy of planning, coordinating, directing and controlling of military actions. View full abstract»

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  • Temperature errors compensation of force sensor for railway carriages wheel load measuring

    Publication Year: 2004 , Page(s): 486 - 490 vol.3
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (237 KB) |  | HTML iconHTML  

    The subject of this paper is the temperature error compensation of a force sensor built on strain gauges. An analysis of the temperature errors has been carried out. All recommended constructive precautions have been applied. Despite this, an additional procedure has been offered, which measures the temperature and corrects the result. The temperature is measured using a platinum resistance thermometry detector element. A proper methodology for temperature calibration of the force sensor has been developed. Figures for the linear temperature dependence of the offset and gain have been included, which compensate the error with sufficient accuracy. View full abstract»

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  • Reliability of lead free solders joints and manufacturability during the SMT process

    Publication Year: 2004 , Page(s): 580 - 586 vol.3
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (737 KB) |  | HTML iconHTML  

    In systematic investigations the failure behaviour of lead free solder joints for different solder alloys as well as substrate metallization was analyzed. The emphasis of the investigations was the optimization of the processing parameters for the printing of different lead-free no-clean solder pastes in the standard pitches from 1.27 mm to 0.4 mm. Furthermore, evidence was provided of the aging-determined changes of the solder joints by means of a sensitive resistance measurement system and in correlation therefore illustrated on the basis of metallographic cross sectioning. Therefore, a demonstrator was developed on FR4 with the electroless tin and electroless nickel/immersion gold (ENIG) surface metallizations and assembled with the leadless chip components R0402, R0603, and R0805 with pure tin metallization. As alternative lead-free solders were examined the eutectic alloy SnAg3.8CuO.7, SnAg3.5 and the SnAg0.2Cu1.0 solder. The aging and/or failure behaviour of the solder joints was detected and evaluated statistically for thermal shock aging from zero to 2000 cycles with -40 C to 125°C by means of a special 4 probe measurement. With the help of these investigations, not only the number of failures as a function of the cycles, but also the influences of the solder alloys and metallization on the failure behaviour could be determined. View full abstract»

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  • Integrated scheduling of heterogeneous CAN and Ethernet-based hard real-time network

    Publication Year: 2004 , Page(s): 481 - 485 vol.3
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    This paper discusses some problems in scheduling heterogeneous Ethernet/CAN real-time networks. Modification of standard Ethernet-based communication subsystem to token-ring, flow-chart and its corresponding Petri-net are provided. Analyses of protocol structure, concurrences, possible raised conditions and methods for their suppression are main target of the paper. Integrated structure of Ethernet/CAN real-time communication subsystem is also analyzed. View full abstract»

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  • Computer simulation of photosensitive sensors based on polysilicon p/i and p/i/n structures

    Publication Year: 2004 , Page(s): 405 - 409 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (183 KB) |  | HTML iconHTML  

    In this paper, a semiconductor device simulator PC1D is used to investigate the behavior of photosensitive polycrystalline p/i and p/i/n structures. The main physical characteristics - impurity concentrations, diffusion lengths, bulk and surface recombinations are varied in a wide range. The junction depths and thicknesses of the constituent layers are fixed. The obtained electrical characteristics for both photosensitive structures are compared. On the basis of the obtained results, photosensitive sensor optimized structures are proposed. It is shown that PC1D can be successfully applied for the simulation of polycrystalline photosensitive structures. View full abstract»

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  • Analysis and design of active filters with generalized impedance converter

    Publication Year: 2004 , Page(s): 398 - 404 vol.3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (248 KB) |  | HTML iconHTML  

    Studying active filters is a basic composite part of student education in electronics and communication engineering. A methodology for designing active filters with a generalized impedance converter is proposed. Profound investigations of the considered model show that the circuits based on it are some of the lowest sensitivity active sections with great stability and possibilities for realizing high quality factors. Computer simulation with the product MicroCAP is used for investigating different types of active filters obtained on the basis of modifying the main model. These modifications allow low-pass, high-pass, pass-band and stop-band polynomial second-order sections and low-pass and high-pass elliptical second-order sections to be realized. Simulation results are given in tables and in graphical form and can be used in the educational process. Modeling increases the education effectiveness by extending the interests to the studied educational material and improves the motivation of the students. View full abstract»

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  • Stability analysis of digital radio channels under the influence of the signal inter-symbolic interference

    Publication Year: 2004 , Page(s): 383 - 387 vol.3
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    Inter-symbolic interference is analyzed as a disturbance. At a given information flow and known pulse characteristics of the channel, the received signal could be defined with precision up to the additive disturbance. A mathematical model of a radio channel with frequency-dependent parameters received under inter-symbolic interference is proposed. This method for compensation of inter-symbolic interference allows evaluation of the error probability during the process of received signal recognition for different types of signal modulation and proposes algorithms for inter-symbolic interference compensation. View full abstract»

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