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Microcode with Embedded Timing Constraints

Microcode with Embedded Timing Constraints

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19th international conference on Architecture of Computing systems, ARCS 2006

作者： Fechner, Bernhard Department of Computer Science FernUniversitat in Hagen Hagen58084 Germany

Watchdogs are a well-known and widespread means to increase the safety of microprocessors. the programmer or the compiler must insert instructions to reset the watchdog. If the programmer or compiler chose the wrong timing values or forgot to insert instructions to reset the timer, the processor will never be able to fulfill its task, because it will be set back to an initial (known) state each time it encounters a timing violation. We eliminate the need to insert special instructions and dedicated external watchdog hardware. Our strategy is able to detect transient control-flow faults in state automata and faulty BUSY-signals of execution units in microcode-based microprocessors. the innovation is to introduce fixed timings for each microcode so explicit instruction sequences to reset the watchdog timer are not necessary any more. Each execution unit receives a timing value from the microcode ROM. A unit-specific cycle counter is set to the timing from the microcode (pcode) when the execution starts. Due to possible different execution runtimes (e.g. floating point division), we include the possibility to select the timing accuracy. If the timing is not accurate, the timing value is set to the maximal timing of the concerned operation. then, a fault will only be signaled if the cycle-counter value is greater than the maximal timing. the scheme can be implemented very fast at small additional hardware cost. An FPGA-based implementation of microcode timing as an extension of a multi-cycle 32 bit microprocessor with support for forwarding showed a hardware increase of less than 1.3% using normal place and route effort with a maximal execution time of 16 cycles for each microcode. © 2006 Gesellschaft fur Informatik (GI). All rights reserved.

关键词： Program compilers

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Scheduling temporal data for real-time requests in roadside-to-vehicle communication

Scheduling temporal data for real-time requests in roadside-...

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IEEE international conference on Embedded and Real-Time Computing systems and Applications (RTCSA)

作者： Kai Liu Victor C.S. Lee Joseph K.Y. Ng Sang H. Son Dept of Computer Science City University of Hong Kong Kowloon Hong Kong Dept of Computer Science Hong Kong Baptist University Kowloon Hong Kong Dept of Information and Communication Engineering DGIST Daegu Korea

Recent advances in wireless communication technologies have spawned many new applications in vehicular networks. Data dissemination via roadside-to-vehicle communication is a vital approach to enabling most of these applications. In this work, we investigate in the scenario where data items are broadcasted from the road-side unit (RSU) in response to requests submitted by passing vehicles. Data items are associated with temporal constraints and updated periodically to reflect dynamic states of traffic information. Each request may ask for multiple temporal data items, and it is associated with a deadline, which may either be specified by the driver or imposed by the time when the vehicle drives through the service region. In particular, we develop a real-time data dissemination model based on roadside-to-vehicle communication by formulating the time-constraint of requests and the consistency requirement of retrieving temporal data items. On this basis, we propose an online scheduling algorithm to enhance the system performance in terms of maximizing request service and improving bandwidth utilization. Lastly, we build a simulation model to evaluate the algorithm performance in a variety of situations. Experimental results demonstrate that the proposed algorithm outperforms existing algorithms significantly in both request serving and bandwidth utilization.

关键词： Vehicles Productivity Scheduling algorithms Real-time systems Data models Bandwidth Scheduling

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Morphological shape description and shape recognition using geometric spectrum on multidimensional binary images

Morphological shape description and shape recognition using ...

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international conference on Industrial Electronics, control and Instrumentation

作者： C.C. Pu F.Y. Shih Department of Information Management Mingshin Institute of Technology and Commerce Hsinchu Taiwan Department of Computer and Information Science New Jersey Institute of Technology Newark NJ USA

A useful morphological shape description tool called geometric spectrum (G-spectrum) for quantifying the geometric features of multidimensional binary images is described. the basis of this tool relies upon the cardinality of a set of non-overlapping segments in an image using morphological operations. G-spectrum is not only used as a shape descriptor for describing the geometric features but also as a tool for shape recognition. In this paper, a shape recognition algorithm using G-spectrum is presented. the test results show that shape recognition using G-spectrum is satisfactory.< >

关键词： Multidimensional systems Shape measurement Morphological operations Image analysis Image processing Filters Image recognition Information management Business Information science

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On the power-aware resource allocation for linear-pipelined real-time tasks

On the power-aware resource allocation for linear-pipelined ...

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international conference on Advanced Information Networking and Applications (AINA)

作者： Chun-Chao Yeh Department of Computer Science National Taiwan Ocean University Taiwan

ISBN: (纸本)0769522491

In this paper, we extend previous works on task assignment problems for a set of linear-pipeline tasks over a set of processors. Different from previous works, we revisit the problems with two additional system factors: deadline and energy-consumption, which are key factors in real-time and power-aware computation. For a set of linear-pipelined real-time tasks (each with same deadline) and a set of processors (or hosts), we discuss how to develop an energy-efficient resource-allocation scheme to assign processors (or hosts) to handle the tasks and set the processor speed properly so that all tasks can be completed by a given deadline and with minimal energy consumption. We propose an O(m/sup 2/logm) time complexity algorithm to determine optimal task-assignment and speed-setting schemes leading to minimal energy consumption, for a given m real-time tasks running on n identical processors (with or without DVS supports). Also, an O(min(n/sup 2/m/sup 2/, nm/sup 2/logm)) time complexity algorithm is proposed for systems with an array of n heterogeneous processors in fixed order.

关键词： Resource management Energy consumption Partitioning algorithms Real time systems Voltage control Oceans computer science Energy efficiency Power dissipation Dynamic voltage scaling

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Real-time simulation for continuous processing of an electrolytic tinning line

Real-time simulation for continuous processing of an electro...

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international conference on Industrial Electronics, control and Instrumentation

作者： Eung-Seok Kim Joon-Soo Lee Hyun-Sik Ahn Young-Jo Cho Sang-Rok Oh Ick Choy Kwang-Bae Kim Hai-Won Yang Control Systems Lab Korea Institute of Science and Technology Seoul South Korea Department of Electronics Eng Kookmin University Seoul South Korea Department of Electrical Eng Hanyang University Seoul South Korea

ISBN: (纸本)0780308913

In this paper, a real-time simulation is performed to insure the continuous processing of an electrolytic tinning line (ETL). An ETL is modelled mathematically and a simple type of tension and speed controllers are designed to control the tension and speed of the strip to be within the tolerance error bound. the designed controller is implemented and tested by using a real-time simulation system which consists of 32 bit VME-based single board computers and a real-time operating system (VRTX).< >

关键词： Strips Mathematical model Real time systems Productivity Poles and towers Manufacturing automation Manufacturing processes control system synthesis computer errors Error correction

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Detecting Domain Generation Algorithms in Malware Traffic Using Constrained Resources

Detecting Domain Generation Algorithms in Malware Traffic Us...

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IEEE international conference on Intelligent computer Communication and Processing (ICCP)

作者： Victor Moşolea Ciprian Oprişa Computer Science Department Technical University of Cluj-Napoca Bitdefender Cluj-Napoca Romania

A large number of malware samples use Domain Generation Algorithms (DGA) for locating and connecting to the Command and control server. this technique enables the malware authors to avoid the C&C domain being seized and makes it difficult for security solutions to blacklist all the possible generated domains. Since the malicious actors register only a small fraction of the generated domains, DGA-enabled malware will generate a large number of unresolved DNS queries. Unfortunately, security solutions cannot rely solely on this heuristic, as computing systems can also produce unresolved DNS queries for benign reasons. Checking whether an unresolved domain is generated by a DGA can be done using Machine Learning algorithms, but the model usually requires high computing power, either locally or in the cloud. We propose a low footprint Machine Learning model that is able to detect generated malicious domains without the need for a great deal of memory and overall computational power. Furthermore, our model enables resource-constrained devices such as home routers to protect themselves and the local network. the experimental results show that our model has a close performance to the state-of-the-art classifiers while using just a fraction of their resources.

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Improvement of fuzzy auto-tuning method of DC chopper system using manipulated value

Improvement of fuzzy auto-tuning method of DC chopper system...

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international conference on Industrial Electronics, control and Instrumentation

作者： K. Izumi M. Tsuji J. Oyama E. Yamada Department of Electrical Engineering and Computer Science Nagasaki University Nagasaki Japan

An auto-tuning using fuzzy reasoning is discussed for the I-PD control systems. We have previously (1993) proposed one method about same topic. In this paper, we have proposed two new methods of reasoning and compared with conventional ones. In the fuzzy auto-tuning, the characteristic values are calculated with the reference, the controlled, and the manipulated value at each sampling time. Next, new gains are set by multiplication with adjustment coefficients determined by fuzzy reasoning and last gain values. the fuzzy reasoning is obtained by a product-sum compositional rule of inference, and then defuzzified by the height procedure to generate a nonfuzzy value. In the simulation, the settling time by using these was shorter than one using a conventional value, which only uses controlled value and reference. An appropriate control response is obtained by tuning of several times on DSP control system. In the experiment, the tuning time using the new proposed characteristic value was shorter than that using the previous method. In the result, the effectiveness of this method is shown.< >

关键词： Fuzzy systems Choppers control systems Fuzzy reasoning Automatic control Fuzzy control three-term control Digital signal processing Nonlinear dynamical systems Lamps

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False Data Injection Attacks Against High Voltage Transmission systems

False Data Injection Attacks Against High Voltage Transmissi...

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international conference on Distributed Computing in Sensor systems (DCOSS)

作者： Panagiotis Radoglou-Grammatikis Magda Zafeiropoulou Maria Atanasova Pencho Zlatev Sofia Giannakidou thomas Lagkas Vasileios Argyriou Evangelos K. Markakis Ioannis Moscholios Panagiotis Sarigiannidis Department of Electrical and Computer Engineering University of Western Macedonia Kozani Greece Innovative Energy and Information Technologies LTD (IEIT BIC-IZOT Sofia Bulgaria K3Y Ltd Sofia Bulgaria Department of Computer Science International Hellenic University Kavala Campus Greece Department of Networks and Digital Media Kingston University London Surrey UK Department of Electrical and Computer Engineering Hellenic Mediterranean University Crete Greece Department of Informatics & Telecommunications University of Peloponnese Tripolis Greece

the digitisation of the smart electrical grid provides several advantages and valuable services, such as self-monitoring, pervasive control and smart healing. However, despite the benefits of this progression, critical cybersecurity and privacy issues are raised due to the vulnerabilities of legacy Electrical Power and Energy systems (EPES) and the evolution of stealthy cyberthreats and malware. In this paper, we give emphasis to False Data Injection Attacks (FDIAs) that can affect the EPES State Estimation (SE). In particular, we investigate two FDIA categories, namely: (a) Global Positioning System (GPS) Spoofing Attacks and (b) IEEE C37.118 FDIAs against an actual testbed emulating a high-voltage IEEE 9-Bus transmission grid. Finally, we provide a relevant Intrusion Detection System (IDS) capable of detecting the aforementioned FDIAs. the evaluation analysis demonstrates the impact of the above FDIAs and the efficiency of the proposed IDS.

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Optimal control of Drones for a Train-Drone Railway Diagnostic System

Optimal Control of Drones for a Train-Drone Railway Diagnost...

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IEEE international conference on Automation science and Engineering (CASE)

作者： Silvia Proia Graziana Cavone Raffaele Carli Mariagrazia Dotoli Department of Electrical and Information Engineering Polytechnic of Bari Italy Department of Civil Computer and Aeronautics Technologies Engineering University Roma Tre Italy

the inspection of railway systems with traditional wayside detectors allows mainly the detection of wheels and axle bearings defects and can be time-demanding, unsafe, and heavily dependent on humans. To overcome these issues and then optimize and automate the rail and track diagnosis process, drones can be an excellent solution thanks to their onboard state-of-the-art cameras and sensors. thus, with the aim of rapidly collecting highly accurate data, an innovative hybrid movable railway diagnostic architecture, consisting of a diagnostic train and a fleet of drones, is defined in this work. From the control point of view, the main interest is in optimally managing the crucial phase of drones returning to and landing on the moving train when the railway inspection mission is completed. To control the fleet of drones, a combination of consensus algorithm in the leader-following mode and linear quadratic regulator (LQR) is implemented for the flight formation phase and the landing phase on the moving base platform (i.e., the diagnostic train), respectively. the landing phase is performed both as vertical or oblique descent through a go to goal and as oblique descent along a predefined path. the obtained results of the railway diagnostic architecture simulations are presented and discussed in detail. In particular, they show that the vertical and oblique descent performed as go to goal are certainly faster than the oblique descent along a predefined path.

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Dynamic channel assignment based on interference measurement with threshold for multi-beam mobile satellite networks

Dynamic channel assignment based on interference measurement...

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Asia-Pacific conference on Communications

作者： Masahiro Umehira Sunao Fujita Zhen Gao Jing Wang Graduate School of Science and Engineering Ibaraki University Hitachi-shi Ibaraki Japan Research Institute of Information Technology Tsinghua University Beijing P.R. China

Satellite and terrestrial integrated mobile communication systems (STICS) is proposed to secure communications services anytime and anywhere. In the case of natural disasters or special event, it is required for satellite systems to allocate the frequency resources to a specific area as much as possible. Dynamic channel assignment is one of the attractive solutions to achieve the flexible and efficient utilization of the frequency resources. Although dynamic channel assignment can increase the bandwidth per satellite cell, smaller frequency reuse factor results in larger inter-cell interference and the link quality degradation. To solve this problem, this paper proposes centralized dynamic channel assignment based on interference measurement with link quality threshold control for multi-beam mobile satellite communications networks. It also shows the performance evaluation results by computer simulations regarding the blocking rate and the link quality.

关键词： Satellites Channel allocation Interference Mobile communication Scattering Mobile computing Satellite communication

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