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Development of Sensors Using Giant Magnetoimpedance Effect In Amorphous Ribbons
Pratap Kollu,Lan Jin,Seok Soo Yoon,Hung Tran Quang,Chong-Oh Kim,CheolGi Kim 한국자기학회 2006 한국자기학회 학술연구발표회 논문개요집 Vol.- No.-
Micro Sized magnetic sensors are needed for recent developments such as magnetic recording technology, highly accurate rotary encoding for intelligent robot control, nondestructive testing and sensing in various industrial and environmental measurement tasks, and automotive control applications. Following the demands of industrial and automotive electronics, a direction sensitive micro-magnetic field sensor is developed using the Giant MagnetoImpedance (GMI) effect in a amorphous Co??Fe₄B₁?Si₁? ribbon. Sensor consists of an amorphous ribbon of about 1 ㎝ length, 20㎛ thickness and 1mm width. The ability of the GMI sensor to detect the geomagnetic field is tested in the laboratory. The sensor is tested for its linearity and angle dependence. The permeability and gmi spectrum for as-quenched, annealed and bead coated samples are studied. The sensor is modeled based on these measurements. The resolution of the sensor is found to be 1V/Oe and angle resolution is 1㎷/degree. The permeability spectrum and the GMI profile of the Magnetic Dynabead M-280<SUP>®</SUP>coated amorphous ribbon are studied, and its application in biosensor is proved experimentally.
Pratap Karki,Eunsook Lee,Michael Aschner 대한직업환경의학회 2013 대한직업환경의학회지 Vol.25 No.-
Manganese (Mn) is an essential element that is required in trace amount for normal growth, development as well maintenance of proper function and regulation of numerous cellular and biochemical reactions. Yet, excessive Mn brain accumulation upon chronic exposure to occupational or environmental sources of this metal may lead to a neurodegenerative disorder known as manganism, which shares similar symptoms with idiopathic Parkinson’s disease (PD). In recent years, Mn exposure has gained public health interest for two primary reasons: continuous increased usage of Mn in various industries, and experimental findings on its toxicity, linking it to a number of neurological disorders. Since the first report on manganism nearly two centuries ago, there have been substantial advances in the understanding of mechanisms associated with Mn-induced neurotoxicity. This review will briefly highlight various aspects of Mn neurotoxicity with a focus on the role of astrocytic glutamate transporters in triggering its pathophysiology.
Prototype Milli Gauss Meter Using Giant Magnetoimpedance Effect in Self Biased Amorphous Ribbon
Pratap Kollu,Seok Soo Yoon,Gun Woo Kim,C. S. Angani,Cheol Gi Kim 한국자기학회 2010 Journal of Magnetics Vol.15 No.4
In our present work, we developed a GMI (giant magnetoimpedance) sensor system to detect magnetic fields in the milli gauss range based on the asymmetric magnetoimpedance (AGMI) effect in Co-based amorphous ribbon with self bias field produced by field-annealing in open air. The system comprises magnetoimpedance sensor probe, signal conditioning circuits, A/D converter, USB controller, notebook computer, and program for measurement and display. Sensor probe was constructed by wire-bonding the cobalt based amorphous ribbon with dimensions 10 ㎜ × 1 ㎜ × 20 ㎛ on a printed circuit board. Negative feedback was used to remove the hysteresis and temperature dependence and to increase the linearity of the system. Sensitivity of the milli gauss meter was 0.3 V/Oe and the magnetic field resolution and environmental noise level were less than 0.01 Oe and 2 mOe, respectively, in an unshielded room.
Ultra Low Field Sensor Using GMI Effect in NiFe/Cu Wires
Pratap Kollu,Doung Young Kim,Cheol Gi Kim 한국자기학회 2007 Journal of Magnetics Vol.12 No.1
A highly sensitive magnetic sensor using the Giant MagnetoImpedance effect has been developed. The sensor performance is studied and estimated. The sensor circuitry consists of a square wave generator (driving source), a sensing element in a form of composite wire of a 25 ㎛ copper core electrodeposited with a thin layer of soft magnetic material (Ni??Fe₂?), and two amplifier stages for improving the gain, switching mechanism, scaler circuit, an AC power source driving the permeability of the magnetic coating layer of the sensing element into a dynamic state, and a signal pickup LC circuit formed by a pickup coil and an capacitor. Experimental studies on sensor have been carried out to investigate the key parameters in relation to the sensor sensitivity and resolution. The results showed that for high sensitivity and resolution, the frequency and magnitude of the ac driving current through the sensing element each has an optimum value, the resonance frequency of the signal pickup LC circuit should be equal to or twice as the driving frequency on the sensing element, and the anisotropy of the magnetic coating layer of the sensing wire element should be longitudinal.
Pharmacodynamic evaluation of hypoglycemic effect of Damtab in healthy adultmale volunteers
Pratap Kumar Sahu,AK Najmi,KK Pillai,Nilanjan Saha,Manju Sharma 경희대학교 융합한의과학연구소 2007 Oriental Pharmacy and Experimental Medicine Vol.7 No.2
The objectives of the study were (1) To evaluate the safety and tolerability of Damtab. (2) To characterize hypoglycemic effect of Damtab, if any. (3) To evaluate insulin sensitivity effect of Damtab, if any. Hypoglycemic effect of Damtab (700 mg and 1,400 mg) were examined. Gliclazide (80 mg) was used as an active control. Placebo was used as control. Breakfast was given, half an hour before dosing whereas lunch, snacks and dinner were given at 6, 10 and 14 h post dose. An oral glucose tolerance test was conducted to calculate the insulin sensitivity index from the values of glucose and insulin during oral glucose tolerance test. Both giclazide 80 mg and Damtab 1,400 mg significantly lowered plasma glucose level up to 6 h. Insulin sensitivity index of Damtab (1,400 mg) was found to be similar to that of placebo. A significant increase in insulin level at 1 h post dose of Damtab (1,400 mg) was observed. Damtab 700 mg shows placebo like effect whereas Damtab 1,400 mg possesses hypoglycemic effect.