¡@¡@With the rapid advance of information technology, embedded systems are becoming mature technology and have penetrated into most of the equipment. On the other hand, the unified modeling language (UML) has become a standard modeling language in object-oriented systems analysis and design. Over the past few years a considerable effort has been made in modeling the platform independent model (PIM) with UML for business information systems. However, the detailed guideline for modeling the PIM of embedded systems is lacking. ¡@¡@To alleviate the forgoing problem, this study proposed a PIM modeling methodology for embedded systems. This includes the use of sequence diagram, state machine diagram, timing diagram and class diagram for behavior and static modeling. For each diagram, the detailed modeling processes and rules are described. The research methodology is articulated using the design science research methodology. A usability evaluation is performed to demonstrate its applicability with a real-world embedded system case. With this proposed method, the system developer can easily model the PIM of embedded systems, and thereby enhance the efficiency and effectiveness of system development.

In recent years, the applications of wireless mesh network in the embedded systems have become more widely. It's an important issue that how to consume lower energy and transfer data stably based on energy considerations. The embedded systems must have the appropriate routing protocol for low power consumption and stable long-distance data transmission. In this paper, a routing protocol is proposed with sequential repair and backup routing protocol(Ad Hoc On-Demand Distance Vector Routing-Sequential Repair and Backup Routing Protocol, AODV-SRBR Protocol), that can reduce the number of transceivers and have a stable connection. In the proposed routing protocol, the node of network can create multi-route message through decoding the path information of packets. Using a complete routing information can reduce the number of route request packets efficiently. when the link is broken, the proposed protocol can repair the data transmission by sequential repair or select backup routing. In this paper, we implement the routing protocol to verify a multi-hop connection and data transfer in the general environment. The performance of AODV-SRBR and AODV is compared and simulated by NS2. The proposed routing protocol can achieve same transmission efficiency in the fewer route request packets, fewer maintance packets and fewer transmit and receive times according to the simulation result. By stable connection¡Blow power consumption and multi-hop data transfer, we expect that the proposed routing protocol on the embedded systems platform can be extended in large sensor mesh network.

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Multimedia workloads have always held an important role in embedded applications. The thesis presents a Multimedia Enhanced MicroController Unit (ME-MCU) for low-cost embedded applications. The main components of ME-MCU include a PIC16C 8-bit MCU core with a 32-bit multimedia extension, an enhanced memory interface fo signal processing, and an embedded In-Circuit Emulator (ICE). The main goal is not only to improve the media performance, but also to keep the small-area benefit of signle-chip microcontrollers. In addition, base on the architecture of ME-MCU, we proposed a reusable MultiMedia Extension SIP (MME SIP) for providing the CPU designers a simple solution to perform the multimedia extension to an exist ISA. A cost-effective multimedia extension to ARM7 microprocessors has been introduced as a case study of MME SIP. The MME SIP is capable of reducing the execution cycle counts by 69% to 81% for several critical loops, with an average speedup of 3.41, while the gate count overhead is kept under 11%.

A new hardware system for the ECE 4550 Control System Design lab is proposed. The current hardware is examined and its shortcomings are documented. Design guidelines for the new system are put forth and interfaces between hardware elements are defined. Four hardware elements are developed: a motherboard, an I/O daughtercard, a DC motor driver daughtercard, and an AC motor driver daughtercard. Each of these systems is examined in depth from a design decision standpoint as well as from the standpoint of the design guidelines promulgated earlier. Technical limitations for each system are disclosed and examined in detail.

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<p>Dealing properly with electronics and software will be a strong competitive advantage in the automotive sector in the near future. Electronics are driving current innovations and are at the same time becoming a larger part of the cost of the vehicle. In order to be successful as an automotive manufacturer, innovations must be introduced in the vehicle without compromising the final price tag. Also, the electronics has to compete with, and win over, the dependability of well known and proven mechanical solutions.</p><p>Structure related costs can be reduced by designing a modular system, volume related costs can be reduced by utilizing fewer electronic control units that shares software performing a variety of functions. To achieve a modular system careful consideration must be applied in the architecture design process. Architecting is commonly referred to as an art, performed in a qualitative manner. This thesis provides a quantitative method for architecture design and evaluation targeting modular architectures.</p><p>The architecture design method is based on a simple underlying information model. This model is extended through practical experiences in case studies to include support for configuration and documentation.</p><p>An information model is a key enabler for managing the increasing complexity of automotive embedded systems. The model provides the basis for establishing the analyzable documentation that is required to ensure the dependability of the systems, specifically in terms of need for reliability, maintainability and safety. An information model supports traceability both within the product, across components, and also between different organizational units using different views of the product throughout the lifecycle.</p><p>Further, some general issues of systems engineering and model based development related to the engineering of automotive embedded systems are discussed. Considerations for introducing a model based development process are covered. Also, the maturity of development processes and requirements on tools in an automotive context are evaluated. The ideas and methods presented in this thesis have been developed and tried in an industrial setting through a range of case studies.</p>

In the automotive industry today, embedded systems have reached a level of complexity which is not maintainable with the traditional approach of design- ing automotive embedded systems. For this purpose, many of the worlds leading automotive manufacturers have formed an alliance to apprehend this problem. This has resulted in AUTOSAR, an open standardized architecture for automotive embedded systems, which strives for increased flexibility and safety regulations. This thesis will explore the possibilities of implementing a CAN Communication stack using the AUTOSAR architecture and its corresponding methodology. As a result of this thesis, a complete AUTOSAR CAN communication stack has been implemented, as well has a simulator application with the purpose of testing its functionality.

The time consuming, tedious, and, sometimes, never ending search for a parking spot is a matter of common experience. We present an innovative approach to parking monitoring systems that only requires sensors at the entry and exit points of a street segment in an open environment such as a city downtown (as opposed to a closed environment such as a parking garage/lot). It can be trivially understood that using this set-up we can determine the number of vehicles present in a given street segment at any given time. However, the bigger issue is to closely estimate how many of those vehicles are parked or en route. We present an algorithm by which we can have a practical estimate of parked cars without introducing any more sensors. We further present a self-stabilizing system that can be implemented for fault tolerance and a few other methods to mitigate errors that may accrue over time. Our approach is based on the assumption that drivers do not care about the exact location of the parking spot, as long as they know the “street segment” where parking is available. For example, just letting the users know of available parking on 7th street between Red River and Brazos gives them enough information to easily find a parking spot. This type of information would most likely be shown on a map. Once the driver reaches the correct street area, it is easy to locate an empty parking spot. Finally, to test and evaluate our approach, we developed and deployed an embedded system using ultra-sonic sensors, and a Microsoft Bing Map application with the said user interface, along with an interoperable web service that can provide parking information to any third party application. / text