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Component Dependency in Object-Oriented Software

Journal of Computer Science & Technology 2007年第3期22卷 379-386页

作者：于立国 srini ramaswamy Computer Science and Informatics Indiana University South Bend South BendIN 46615U.S.A. Department of Computer Science University of Arkansas at Little Rock Little RockAR 72204U.S.A.

Component dependency is an important software measure. It is directly related to software understandability, maintainability, and reusability. Two important parameters in describing component dependency are the type of coupling between two components and the type of the dependent component. Depending upon the different types of coupling and the type of the dependent components, there can be different effects on component maintenance and component reuse. In this paper, we divide dependent components into three types. We then classify various component dependencies and analyze their effects on maintenance and reuse. Based on the classification, we present a dependency metric and validate it on 11 open-source Java components. Our study shows that a strong correlation exists between the measurement of the dependency of the component and the effort to reuse the component. This indicates that the classification of component dependency and the suggested metric could be further used to represent other external software quality factors.

关键词： dependency maintenance metric object-oriented software reuse

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Adaptive Regulator for Networked Control Systems: MATLAB and True Time Implementation

Adaptive Regulator for Networked Control Systems: MATLAB and...

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第25届中国控制与决策会议

作者： Seshadhri srinivasan Mishiga Vallabhan srini ramaswamy lle Kotta Institute of Cybernetics Tallinn University of Technology

Networked Control Systems （NCSs） employ digital network for transmitting control and monitoring information among system components. Control information over digital network may be delayed due to transmission and this can adversely affect the control performance. To achieve desired performance in the presence of delays the controller needs to modify its gains based on the channel delay. In this paper, we propose a simple adaptive regulator that uses the first order approximation for computing the controller gains based on prior knowledge of channel delays from experiments. Simulation results indicate that the adaptive regulator performs well even when we model the delay via Gaussian distribution. Delay samples obtained from MODBUS over TCP/IP and data-networks are used to illustrate the performance of the controller. The controller is implemented in True Time to illustrate its real-time performance.

关键词： Networked Control Systems (NCSs) adaptive control random delays linear quadratic regulator (LQR) Adaptive regulator (AR)

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