No abstract

As medical sciences have progressed and new medicines discovered, the use of more precise and optimal methods of injecting medicinal fluids and more specifically injection in longer time spans has become evident. Peristaltic pump is used in almost all medical supervisions which require precision application of medicines more common in hospitals, elderly housings, clinics and private home patient care taking. This pump may be used for slow liquid medicine injections for the purpose of pain reduction in a wide spectrum of inpatient treatments as well as for tube feeding in patients incapable of eating solid foods. Due to the vital importance of peristaltic pump applications in medical institutions and in respect to previous design efforts done on this machine, the objective of this research is designing multipurpose model of it and preparing necessary plans for its industrial manufacturing using interaction design. In order to obtain the hospital nurses opinions as target population about the application and desired characteristics of a peristaltic pump, a survey research method (questionnaire, personal interview and observation) are applied. Finally, proposed plan for a novel product consists of a pump body taking into consideration the functional; ergonomics as well as aesthetics aspects are represented.

Low frequency oscillations (LFO) in power system occur usually because of lack of damping torque to overcome disturbances in power system such as changes in mechanical power. Traditionally, power system stabilizers (PSS) are being used to damp these oscillations. Thyristor Controlled Series Compensator (TCSC) is a well-known FACTS device that can control power flow in transmission lines. It can also replace PSS to damp low frequency oscillations effectively by cancelling a portion of the reactance line impedance and thereby increase the transmittable power. In this paper a linearized Heffron-Philips model of a (Single Machine Infinite Bus) power system with a TCSC controller is developed. The designed fuzzy c-means clustering TCSC controller adjusts control signal by appropriately processing of the input signals, and provides an efficient damping. The results of the simulation show that the TCSC with fuzzy c-means clustering controller is more effective in damping LFO compared to TCSC with lead-lag compensator.