control of well drilling operations poses a challenging issue to be tackled. the loss of well control could lead to the occurrence of blowout as a severe threat, involving the risk of human lives and environmental and economic consequences. conventional proportional-integral (pi) controller is a common practice in the well control operation. the small existing margin between pore pressure and f...

in this paper, we try to use modeling based on singular perturbation theory, in order to control satellite attitude during the wide rolling angle maneuvering through nonlinear h∞ control strategy. differential equations describing dynamics of the satellite are presented first, and by choosing the appropriate dynamic model for actuators and based on the standard singular perturbation model, the ...

The management of the information systems (IS) function is a complex task, particularly in the case of multinational corporations (MNCs), where installations dispersed across distance, time, and cultures can lead to diverse and incompatible systems spreading among foreign subsidiaries. The need to globally control and coordinate the IS management function is often met with resistance from local...

M. Liepe , S. Belomestnykh, J. Dobbins, R. Kaplan, C. Strohman, LEPP, Cornell University, Ithaca, NY 14853, USA Abstract Recent progress in developing digital low-level RF controls for accelerators has made digital systems an option of choice. At Cornell we are presently working on two projects: upgrading the RF controls of the Cornell Electron Storage Ring (CESR) for charm-tau operation (CESR-...

Background and Objectives: Considering the importance of the radiology department, which devours most of the financial resources, efficiency and effectiveness in this department is one of the main concern of policymakers in most health care systems. The aim of this study was to investigate the efficiency and effectiveness of a radiology department before and after the implement...

background : due to rapid advances in modern technologies such as telecommunication technology, the world has witnessed an exponential growth in the use of digital handheld devices (e.g. smartphones and tablets). this drastic growth has resulted in increased global concerns about the safety of these devices. smartphones, tablets, laptops, and other digital screens emit high levels of short-wave...

Abstract: Today’s motor drives widely use Digital Signal Processor (DSP) or Microcontroller to implement the digital control algorithm. Most recently new requirements have arisen. These include faster torque control update with flexible design capability of motion peripherals for high performance military servo drive applications. A Complete digital hardware based AC servo drive development sys...