In this paper we describe our experiments on a real- time system design, focusing on design alter... more In this paper we describe our experiments on a real- time system design, focusing on design alternatives such as scheduling jitter, sensor-to-output latency, intertask com- munication schemes and the system utilization. The prime objective of these experiments was to evaluate a real-time design produced using the period calibration method (2) and thus identify the limitations of the method. We chose
In this paper we present an experimental evaluation of the period calibration method (PCM) which ... more In this paper we present an experimental evaluation of the period calibration method (PCM) which was developed in Gerber et al. (1994, 1995) as a systematic design methodology for real-time systems. The objective of this experimental study is to assess design alternatives integrated into the method and their performance implication on resultant systems built via the PCM. Such design alternatives include scheduling jitter, sensor-to-output latency, intertask communication schemes, and system utilization. For this study, we have chosen a computerized numerical control (CNC) machine as our target real-time system, and built a realistic controller and a plant simulator. We show the detailed development process of the CNC controller and report its performance. The performance results were extracted from a controlled series of more than hundred test controllers obtained by varying four test variables. This study unveils several weaknesses of the PCM: (1) the communication scheme built int...
In this paper we describe our experiments on a realtimesystem design, focusing on design alternat... more In this paper we describe our experiments on a realtimesystem design, focusing on design alternativessuch as scheduling jitter, sensor-to-output latency, intertaskcommunication schemes and the system utilization.The prime objective of these experiments was toevaluate a real-time design produced using the periodcalibration method [2] and thus identify the limitationsof the method. We chose a computerized numericalcontrol (UNU) machine as our target real-time
In this paper we describe our experiments on a real- time system design, focusing on design alter... more In this paper we describe our experiments on a real- time system design, focusing on design alternatives such as scheduling jitter, sensor-to-output latency, intertask com- munication schemes and the system utilization. The prime objective of these experiments was to evaluate a real-time design produced using the period calibration method (2) and thus identify the limitations of the method. We chose
In this paper we present an experimental evaluation of the period calibration method (PCM) which ... more In this paper we present an experimental evaluation of the period calibration method (PCM) which was developed in Gerber et al. (1994, 1995) as a systematic design methodology for real-time systems. The objective of this experimental study is to assess design alternatives integrated into the method and their performance implication on resultant systems built via the PCM. Such design alternatives include scheduling jitter, sensor-to-output latency, intertask communication schemes, and system utilization. For this study, we have chosen a computerized numerical control (CNC) machine as our target real-time system, and built a realistic controller and a plant simulator. We show the detailed development process of the CNC controller and report its performance. The performance results were extracted from a controlled series of more than hundred test controllers obtained by varying four test variables. This study unveils several weaknesses of the PCM: (1) the communication scheme built int...
In this paper we describe our experiments on a realtimesystem design, focusing on design alternat... more In this paper we describe our experiments on a realtimesystem design, focusing on design alternativessuch as scheduling jitter, sensor-to-output latency, intertaskcommunication schemes and the system utilization.The prime objective of these experiments was toevaluate a real-time design produced using the periodcalibration method [2] and thus identify the limitationsof the method. We chose a computerized numericalcontrol (UNU) machine as our target real-time
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Papers by Namyun Kim