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A new method for PID controller tuning based on process models for cascaded control systems is proposed in this paper. The method consists of first finding the ideal controller that gives the desired closed loop response and then finding the PID approximation of the ideal controller by Maclaurin series. This method can be applied to any open loop stable(More)
Proportional, integral, and deriuatiue (PID) parameters are obtained for general process models by approximating the feedback form of an IMC controller with a Maclaurin series in the Laplace uariable. These PID parameters yield closed-loop responses that are closer to the desired responses than those obtained by PID controllers tuned by other methods. The(More)
As the technology scales, the increase of circuit delay over time due to NBTI (negative bias temperature instability) effect is not negligible any more. It has been known that voltage scaling is an effective scheme that is able to mitigate the NBTI effect. However, a careful control of voltage scaling is required not to increase the dissipation of dynamic(More)
Power gating in circuits is one of the effective technologies to allow low leakage and high performance operations. This work aims to <i>analyze and establish the relations between the three important design parameters in power gated circuits: (i) the maximum current flowing from/to power/ground (ii) the wakeup (sleep to active mode transition) time delay(More)
Very long instruction word processors (VLIW) allow to execute multiple instructions in parallel. At the same time VLIW compilers optimize the source code for maximum performance by grouping as many instructions in parallel as possible. This work addresses the problem of thermal- awareness in VLIW compilers with a temperature control and reduction techniques(More)
The interaction of chemokine (C-X-C motif) ligand 12 (CXCL12) and its receptor CXCR4 may play an important role in the regulation of anterior pituitary function. In this study, we investigated the expression of CXCL12 and CXCR4 and their role in normal rat pituitary and GH-producing GH3 tumor cell line. RT-PCR analysis and immunohistochemistry revealed that(More)
Small and medium enterprises (SMEs) have difficulties identifying appropriate technology opportunities under severe capability and resource constraints. To tackle this issue, we suggest a method for identifying technology opportunities that is customized to the existing technologies and technological capabilities of SMEs through two-stage patent analysis.(More)
Power gating technique is one of the effective technologies to achieve both low leakage and high performance in circuits. This work focuses on considering power-mode transition noise (i.e., ground noise) in power gated circuit design. So far, even though satisfying the limit of power-mode transition noise is an important design constraint, not many works(More)