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Träfflista för sökning "hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Elektroteknik och elektronik) hsv:(Datorsystem) "

Sökning: hsv:(TEKNIK OCH TEKNOLOGIER) hsv:(Elektroteknik och elektronik) hsv:(Datorsystem)

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  • Jang, Jeong Keun, et al. (författare)
  • Area-efficient scheduling scheme based FFT processor for various OFDM systems
  • 2018
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • <p>This paper presents an area-efficient fast Fouriertransform (FFT) processor for orthogonal frequency-division multiplexing systems based on multi-path delay commutator architecture. This paper proposes a data scheduling scheme to reduce the number of complex constant multipliers. The proposed mixed-radix multi-path delay commutator FFT processor can support 128-, 256-, and 512-point FFT sizes. The proposed processor was synthesized using the Samsung 65-nm CMOS standard cell library. The proposed processor with eight parallel data paths can achieve a high throughput rate of up to 2.64 GSample/s at 330 MHz.</p>
  • Bengtsson, Lars, 1963- (författare)
  • Mikrodatorteknik
  • 1995
  • Bok (övrigt vetenskapligt)abstract
    • Första delen behandlar Microchips "Base-line"-kretsar och andra delen behandlar "Midrange"-kretsarna. De flesta funktioner belyses med konstruktionsexempel. Exempel och övningar är mycket hårdvarunära och boken behandlar konstruktion av mikrodatorer från grunden. Boken är avsedd för kurser i mikrodatorteknik på högskolan eller annan högre teknisk utbildning, men kan även användas som självstudiematerial eftersom de flesta exempel ges med detaljerade och verifierade lösningar av såväl hård- som mjukvaran. Tidigare erfarenhet av assemblerprogrammering är inte nödvändig men grundläggande kunskaper i digitalteknik förutsätts. Boken kan med fördel också läsas av rutinerade assemblerprogrammerare som vill veta hur prestanda hos de nya RISC-baserade PIC-controllerna står sig i konkurrensen med de mer etablerade enchipscontrollerna, t ex HC11 och 8751, som bygger på traditionell CISC-arkitektur.
  • Khan, Muhammad Sikandar Lal, 1988- (författare)
  • Presence through actions theories, concepts, and implementations
  • 2017
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • <p>During face-to-face meetings, humans use multimodal information, including verbal information, visual information, body language, facial expressions, and other non-verbal gestures. In contrast, during computer-mediated-communication (CMC), humans rely either on mono-modal information such as text-only, voice-only, or video-only or on bi-modal information by using audiovisual modalities such as video teleconferencing. Psychologically, the difference between the two lies in the level of the subjective experience of presence, where people perceive a reduced feeling of presence in the case of CMC. Despite the current advancements in CMC, it is still far from face-to-face communication, especially in terms of <em>the experience of presence</em>.</p><p>This thesis aims to introduce new concepts, theories, and technologies for presence design where the core is actions for creating presence. Thus, the contribution of the thesis can be divided into a technical contribution and a knowledge contribution. Technically, this thesis details novel technologies for improving presence experience during mediated communication (video teleconferencing). The proposed technologies include <em>action robots</em> (including a telepresence mechatronic robot (TEBoT) and a face robot),<em> embodied control techniques</em> (head orientation modeling and virtual reality headset based collaboration), and<em> face reconstruction/retrieval algorithms</em>. The introduced technologies enable <em>action possibilities</em> and <em>embodied interactions</em> that improve the presence experience between the distantly located participants. The novel setups were put into real experimental scenarios, and the well-known social, spatial, and gaze related problems were analyzed.</p><p>The developed technologies and the results of the experiments led to the knowledge contribution of this thesis. In terms of knowledge contribution, this thesis presents a more general theoretical conceptual framework for mediated communication technologies. This conceptual framework can guide telepresence researchers toward the development of appropriate technologies for mediated communication applications. Furthermore, this thesis also presents a novel <em>strong concept – presence through actions</em> - that brings in philosophical understandings for developing presence- related technologies. The strong concept - presence through actions is an intermediate-level knowledge that proposes a new way of creating and developing future 'presence artifacts'. Presence- through actions is an action-oriented phenomenological approach to presence that differs from traditional immersive presence approaches that are based (implicitly) on rationalist, internalist views.</p>
  • Bengtsson, Lars, 1963- (författare)
  • Embedded FPGA systems VHDL programming and soft CPU systems
  • 2018
  • Bok (övrigt vetenskapligt)abstract
    • This textbook introduces the reader to VHDL which is a Hardware Description Language, i.e. a means to describe digital electronic circuits in a text editor and how to compile this text into electronics. The first part is concluded by writing VHDL code for a simple CPU (a "soft CPU"). In the second part, a commercial soft CPU is downloaded to the FPGA target circuit and programmed in C.
  • Bengtsson, Lars, 1963- (författare)
  • Embedded Measurement Systems
  • 2013
  • Doktorsavhandling (övrigt vetenskapligt)abstract
    • The subject of Embedded Measurement Systems (EMS) is the merging of embedded systems and electrical measurement systems. This indicates that EMSs are hardware-software systems dedicated to measuring one or a few physical quantities. Applications are numerous; EMSs measure the temperature in refrigerators, freezers, irons, ovens and automobile combustion engines, they sense vibrations in tilt alarms and game consoles, they measure airflow in engines and ventilation systems, they measure shock impact in crash detectors and are used as shock and temperature loggers for transport goods, they measure air pressure in airplane cabins, humidity in air-conditioned environments, they measure liquid levels in fuel tanks, they detect smoke in fire alarms, they measure the viscosity of lubricant oil in engines, they measure the rotation speed of spinning wheels (in any engine), they measure torque in engines and are used as heart rate and ECG detectors in medicine etc. The commercial demand for ever cheaper products and worldwide environmental legislations force vendors to continuously look for more cost-efficient and less power-consuming solutions for their embedded measurement systems. This thesis is concerned most of all with the implementation of cost-efficient/low-power measurement systems in embedded controllers. This includes some novel ideas in voltage, time and resistance measurements with embedded controllers and it will demonstrate how these quantities, analog in nature, can be measured accurately and precisely by inherently digital embedded controllers.
  • Bengtsson, Lars, 1963- (författare)
  • RISC-baserad 50 MHz räknare med alfanumerisk display
  • 1995
  • Ingår i: Allt om elektronik. ; 6, s. 35-37
  • Tidskriftsartikel (övrigt vetenskapligt)abstract
    • Denna artikel presenterar en konstruktion som använder en RISC-kontroller (PIC16C54) som frekvensräknare. Frekvensen räknas på controllerns RTCC-ingång och signalfrekvensen, uttryckt i kHz visas på en alfanumerisk display.
  • Bengtsson, Lars, 1963- (författare)
  • Single-Chip Implementation of Level-Crossing ADC for ECG sampling
  • 2017
  • Ingår i: Journal of Electrical & Electronic Systems. - 2332-0796. ; 6:1
  • Tidskriftsartikel (refereegranskat)abstract
    • This work demonstrates for the first time the implementation of a level-crossing analog-to-digital converter (LC-ADC) in a single, commercially available IC (that costs less than $2). The implementation utilizes adaptive threshold levels in order to prevent overload distortions for fast-changing signals. The entire design is based on a 20-pin PIC16F1769 microcontroller from Microchip and no external components are required. In fact, the only external circuitry required is a single jumper wire. This is due to the fact that the new generation of microcontrollers have integrated core-independent hardware, analog as well as digital. This design takes full advantage of the core-independent logic and analog blocks in a PIC16F17xx circuit to implement the LC-ADC technique that so far has required multiple-circuit designs or ASIC implementation. The design is demonstrated on a standard electrocardiogram (ECG) signal.
  • Di Orio, Giovanni, et al. (författare)
  • The PRIME Semantic Language: Plug and Produce in Standard- based Manufacturing Production Systems
  • 2015
  • Ingår i: Proceedings of the Flexible Automation and Intelligent Manufacturing Conference.
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • <p>Nowadays manufacturing production systems are becoming more and more responsive in order to succeed in ahighly unstable environment. The capability of a production system to effectively and efficiently adapt and evolveto face the changing requirements – imposed by volatile and dynamic global markets – is a necessary conditionto enable manufacturing enterprises to be agile. Since the agility of a manufacturing enterprise is always limitedby the agility of its own building blocks than it needs to be spread over the whole enterprise including the operationand information technologies (OT/IT). Turning to production systems, one of the significant challenges isrepresented by the possibility to provide easy and rapid (re-)configuration of their internal components and/orprocesses. Innovative technologies and paradigms have been explored during the years that combined with theincreasing advancement in manufacturing technologies enable the implementation of the “plug and produce”paradigm. The “plug and produce” paradigm is the foundation of any agile production system, since to be agile itis inevitably required to reduce the installation and (re-)engineering activities time – changing/adapting the systemto new requirements – while promoting configuration rather than programming. Therefore, the “plug andproduce” paradigm is a necessary but not sufficient condition for implementing agile production systems. Modernproduction systems are typically known for their plethora of heterogeneous component/equipment. In this complexscenario, the implementation of the “plug and produce” paradigm implies the existence of a well-definedontological model to support components/equipment abstraction with the objective to allow interactions,collaboration and knowledge sharing between them. The PRIME semantic language specifies the semanticstructure for the knowledge models and overall system communication language.</p>
  • Al Nahas, Beshr, 1985-, et al. (författare)
  • Low-power listening goes multi-channel
  • 2014
  • Ingår i: Proceedings - IEEE International Conference on Distributed Computing in Sensor Systems, DCOSS 2014. ; s. 2-9
  • Konferensbidrag (refereegranskat)abstract
    • Exploiting multiple radio channels for communication has been long known as a practical way to mitigate interference in wireless settings. In Wireless Sensor Networks, however, multi-channel solutions have not reached their full potential: the MAC layers included in TinyOS or the Contiki OS for example are mostly single-channel. The literature offers a number of interesting solutions, but experimental results were often too few to build confidence. We propose a practical extension of low-power listening, MiCMAC, that performs channel hopping, operates in a distributed way, and is independent of upper layers of the protocol stack. The above properties make it easy to deploy in a variety of scenarios, without any extra configuration/scheduling/channel selection hassle. We implement our solution in Contiki and evaluate it in a 97-node~testbed while running a complete, out-of-the-box low-power IPv6 communication stack (UDP/RPL/6LoWPAN). Our experimental results demonstrate increased resilience to emulated WiFi interference (e.g., data yield kept above 90% when Contiki MAC drops in the 40% range). In noiseless environments, MiCMAC keeps the overhead low in comparison to Contiki MAC, achieving performance as high as 99% data yield along with sub-percent duty cycle and sub-second latency for a 1-minute inter-packet interval data collection. © 2014 IEEE.
  • Ribeiro, Luis, et al. (författare)
  • Industrial Agents for the Fast Deployment of Evolvable Assembly Systems
  • 2015
  • Ingår i: Industrial Agents : Emerging Applications of Software Agents in Industry. - 1st ed.. - Amsterdam, Netherlands : Elsevier. - 978-0-12-800341-1 ; s. 301-321
  • Bokkapitel (refereegranskat)abstract
    • <p>The current manufacturing scenario is characterized by high market unpredictability. Agility is therefore a central challenge for modern companies that need to understand and be proactive towards their product offer in respect to “what is offered, when it is offered, where, how and by whom” (Brown &amp; Bessant 2003).</p><p>The “what” and the “when” are particularly relevant to the research in emerging paradigms as they account for variety, customization and volume; and timing, speed and seasonality (Brown &amp; Bessant 2003).</p><p>In this scenario, several design approaches and models have been proposed in the last decade to enable re-configurability and subsequently enhance the companies’ ability to adjust their offer in nature and time.</p><p>From a paradigmatic point of view research has concentrated on the organizational structure of the shop-floor and the associated controls aspects. Concepts like Reconfigurable Manufacturing Systems (RMS) (Koren &amp; Shpitalni 2010) and Fractal Factories (FF) (Montreuil 1999) support the physical construction of production systems by regulating their layout and making a few assumptions on their logical organization. On the other hand, concepts like Bionic Manufacturing Systems (BMS)(Ueda 1992), Holonic Manufacturing Systems (HMS)(Van Brussel et al. 1998), Evolvable Assembly Systems (Ribeiro et al. 2010) essentially provide the theoretical guidelines for the logical/computational organization of the system (see (Tharumarajah 1996) for a comparison between BMS, HMS and FF and (Setchi &amp; Lagos 2004) for the rationale supporting the shift from Dedicated Lines to Flexible Manufacturing System and finally RMS).</p><p>While these paradigms provide the conceptual framework and the main design guidelines their actual interpretation and implementation has led to a wider set of architectures (Monostori, Váncza &amp; Kumara 2006; Leitão 2009; Parunak 2000; Pěchouček &amp; Mařík 2008).</p><p>These architectures align the high-level principles with the technological offer and limitations while seeking to address the re-configurability requirements of (Mehrabi, Ulsoy &amp; Koren 2000; Rösiö &amp; Säfsten 2013):</p><ul><li><em>module mobility – modules are easy and quick to move and install;</em></li><li><em>“diagnosability” – it is quick to identify the sources of quality and reliability problems;</em></li><li><em>“integrability” – modules are easy to integrate into the rest of the system.</em></li><li><em>“convertibility” – it is easy and quick to switch between existing products and it is easy to adapt the system to future products;</em></li><li><em>scalability – it is easy to enlarge and downsize the production system;</em></li><li><em>“automatibility” – a dynamic level of automation is enabled;</em></li><li><em>modularity – all system elements are designed to be modular;</em></li><li><em>customization – the capability and flexibility of the production system is designed according to the products to be produced in the system.</em></li></ul><p>Instant deployment, as addressed in the present chapter directly addresses mobility, “integrability”, “convertibility”, scalability and customization. Mechatronic modularity is a prerequisite and is enforced by the proposed architecture and the considered modular design. “Diagnosability” was not specifically tackled.</p><p>In this context, the chapter analyses the agent-based architecture related with the Instantly Deployable Evolvable Assembly System (IDEAS) project that is inspired by the Evolvable Assembly System (EAS) paradigm (Ribeiro et al. 2010) as a mechanism to enable fast deployment of mechatronic modules. EAS advocates the use of process-oriented modules and envisions the production system as a collection of processes and the associated interacting agents.</p><p>The architecture and the related test cases are used to draw the main lessons learned in respect to technological and conceptual implications.</p><p>In this context, the remainder of this text is organized as follows: section 1.1 discusses the main deployment challenges, section 1.2 details the reference architecture and associated concepts, section 1.3 presents the principal implementation decisions, section 1.4 features the main lessons learned, sections 1.5 discusses the benefits of the proposed approach and finally section 1.6 reflects on the main conclusions.</p>
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