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Protecting control planes in networking hardware from high rate packets is a critical issue for networks under operation. One common approach for conventional networking hardware is to offload expensive functions onto hard-wired offload engines as ASICs. OpenFlow networks are expected to provide greater network control flexibility by an open interface to the packet-forwarding plane and by centralized...
Service chaining is one of the challenges in network function virtualization (NFV), where a sequence of middleboxes apply their service to particular traffic. The challenge of service chaining is that a middlebox may alter the content of packet headers; thus, the context of service chaining for particular traffic gets lost. This paper proposes Segmented Proactive Flow Rule Injection (SPFRI) using...
In Software Defined Networks (SDN), intensive traffic monitoring is used to optimize the Quality-of-Service (QoS) of the network paths which are selected. Thus, we introduce the use of the Cognitive Packet Network (CPN) algorithm to SDN in order to optimize the search for new high-QoS paths. We install the CPN algorithm in the Cognitive Routing Engine (CRE), a new application software for SDN, and...
The use of Network Function Virtualization to run network services in software enables Software Defined Networks to create a largely software-based network. We envision a dynamic and flexible network that can support a smarter data plane than just simple switches that forward packets. This network architecture needs to support complex stateful routing of flows where processing by network functions...
Software-Defined Networking (SDN) is a new approach to manage the whole network flexibly by decoupling the control plane and the forwarding plane. While forwarding elements can be managed by a unified control, complexity arisen from the network size and scalability regarding the increase of the control traffic are notable problems. To deal with events of network reconfiguration that occur asynchronously...
Integrating the computing process and the physical process, cyber-physical systems (CPS) pose many challenges to the system analysis and modeling. While most of the existing work focuses on developing the precise and formal model of CPS, little attentions have been given to the early requirements analysis and modeling which focuses on what the users' requirements are and what the software and physical...
Traditionally software development tools, such as compilers, linkers and build engines, were designed for use by individual engineers on dedicated desktop machines. As these tools evolved, they scaled-up by exploiting more powerful development machines. The same tools were adapted for team development to run on small, project-specific clusters by dedicating a server to process a single job at a time...
Designing, developing, and maintaining control software is often a complex and difficult task, especially in larger projects. The paper presents a concept of applying the Model-Driven Development approach with SysML modeling to the IEC 61131-3 development process. Four types of diagrams are used to model different aspects of the system: Requirements Diagram, Package Diagram, Block Definition Diagram,...
Development and testing of automotive embedded control systems traditionally depended on the availability of prototype vehicles. Automotive manufactures adopted model based approaches in order to produce quality products faster. Thus, the need of more integrated testing using virtual environment in an automated manner becomes a vital element of product development. The full vehicle simulator aims...
A complex system's requirements almost always remain uncertain late into its software development. In gas turbine engine control systems at Rolls-Royce, for a traditional project (non-product line) typically 50% of requirements will change between Critical Design Review and Entry into Service. Requirements uncertainty is particularly relevant when defining the scope of a Software Product Line. If...
In the development of complex systems the requirements for the system will almost always remain uncertain late into the software development. In gas turbine engine control systems at Rolls-Royce, typically 50% of requirements will change between Critical Design Review and Entry into Service. Ignoring or not planning for requirements uncertainty will cause scrap and rework that will manifest later...
Vehicular powertrain test bench was designed. A LabVIEW based measurement and control system for the test bench was secondary developed. CAN signals of powertrain's master controllers, serial signals of electric driving system based on USS and MODBUS protocol were synchronously sampled and monitored. The system integrated various communication protocols in one platform and had a good portability and...
This paper presents a study in using quality attribute scenarios to evaluate and improve the software architecture of a control system that plans and affects energy use on a plug-in hybrid electric vehicle. The study confirmed for us the value of the quality attribute workshop approach in an industrial, automotive controls setting. This experience has helped us to understand how we might improve the...
Based on LabVIEW software platform, an ECU calibration system was developed. The communication protocol is Keyword Protocol 2000, which is the universal serial communication Protocol in international automobile industry. This system has vivid and intuitive interface that can realize real-time displaying of monitoring datas of ECU. It also has off-line and on-line calibration function, calibration...
Virtual Instruments are new instrument type that combining hardware and software together. A virtual instrument system includes instrument hardware, concerned software and a computer. It can control a machine and get the operating parameter of a machine. An engine test bench was developed with VC++ basing on Virtual Instruments technology. The system can control an engine and a chassis dynamometer...
In this paper, an efficient control system development method based on real-time virtual hardware-in-the-loop simulation is presented. Instead of developing and testing control system after physical prototype is produced, it can be conducted immediately after concept of controlled system is designed by developing a pure software real-time simulator. In this simulator, all the hardware is virtual....
Engine control systems, consisted of ECU hardware, software, sensors, and actuators, are the most significant part of automotive control, and can be considered as mixed-signal systems which interact with engine through sensors and actuators. In this article, we present a component-based modeling and simulation framework for automotive system design. This component framework is compatible with AUTOSAR...
This paper presents a new method, called ldquostate-partrdquo method, to establish the reliability model of the Full Authority Electronic Control system (FADEC) aiming to control the aircraft engine. Using this method, the system reliability, as well as the part reliability, can be calculated. The key parts which decide the system reliability can be determined. On the basis of above calculation, the...
A method is proposed in the paper that the parameters of a ship autopilot are inspected and regulated simulating the actual ship environment. Various math models are established during the process of ship movements. The main control software and SCM system used for the actual ship simulation are developed. The sea environment is simulated with the method of combining digital and physical simulation...
In order to complete the function, performance test and the acceptance of AMT electric control system used for a vehicle, combined with the operation principle of AMT system, the dynamic performance detection test bench for AMT electric control system powered by AC asynchronous motor, was designed. The subsystem composed of AC asynchronous motor and motor controller was designed to simulate electronic...
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