Global Randnter

Mumbai, India

Global Randnter

Mumbai, India
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Jeong S.H.,Global Randnter | Lee J.E.,Global Randnter | Choi S.U.,Global Randnter | Oh J.N.,Global Randnter | Lee K.H.,Sogang University
International Journal of Automotive Technology | Year: 2012

Recently, the advanced driver assistance system (ADAS), which helps mitigate car accidents, has been developed using environmental detection sensors, such as long and short range radar, lidar, wide dynamic range cameras, ultrasonic sensors and laser scanners. Among these detection sensors, radars can quickly provide drivers with reliable information about the velocity, distance and direction of a target obstacle, as well as information about the vehicle in changing weather conditions. In the adaptive cruise control system (ACCS), three radar sensors are usually needed because two short range radars are used to detect objects in the adjacent lane and one long range radar is used to detect objects in-path. In this paper, low-cost radar based on a single sensor, which can detect objects in both the adjacent lane and in-path, is proposed for use in the ACCS. Before designing the proposed radar, we analyzed the world-wide radar technology and market trends for ACCS. Based on this analysis, we designed a novel radar sensor for the ACCS using radar components, such as an antenna, transceiver module, transceiver control module and signal processing algorithm. Finally, target detection experiments were conducted. In the experimental results, the proposed single radar can successfully complete the detection required for the ACCS. In the conclusion, the perspective and issues in the future development of the ACCS radar are described. © 2012 The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg.

Nugroho A.,Lambung Mangkurat University | Kim M.-H.,Sangji University | Choi J.,Kyungsung University | Choi J.S.,Pukyong National University | And 3 more authors.
Archives of Pharmacal Research | Year: 2012

On high performance liquid chromatography, the caffeoylquinic acid (CQ) occupying the highest proportion of the water-ethanol (7:3) extract of Aster glehni (Compositae) leaves was 3-Op- coumaroylquinic acid (46.10 ± 4.22 mg/g of dried weight) among CQs tested. The IC 50 of the water-ethanol (7:3) extract was 4.23 ± 0.24 μg/mL in the peroxynitrite (ONOO-)-scavenging assay. Phytochemical isolation from A. glehni extract yielded three kaempferol glycosides. The water-ethanol (7:3) extract and both p-coumaric acid and caffeic acid, phenylpropanoid moieties of CQs, had sedative effects in pentobarbital-induced sleeping time in mice and anticonvulsant effects in pentylenetetrazole-induced mice. Furthermore, the phenolic substance-rich W-E (7:3) extract of A. glehni could be used to treat anxiety or convulsion partly due to its peroxynitrite- scavenging mechanism.

Lee M.,Global Randnter | Jang C.,Hanyang University | Sunwoo M.,Hanyang University
Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering | Year: 2015

This paper proposes a robust lane detection algorithm with a cascade particle filter that incorporates a model decomposition approach. Despite the sophisticated tracking mechanism of a particle filter, the conventional particle-filter-based lane detection system suffers from an estimation accuracy problem and a high computational load. In order to improve the robustness and the computation time for lane detection systems, the proposed cascade particle filter decomposes a lane model into two submodels: a straight model and a curve model. By dividing the lane model, not only can the computation time be decreased, but also the accuracy of the lane state estimation system can be increased. The proposed lane detection algorithm and the cascade particle filter were evaluated on various roads and environmental conditions with the autonomous vehicle A1, which was the winner of the 2010 and 2012 Autonomous Vehicle Competition in the Republic of Korea organized by the Hyundai motor group. The proposed algorithm proved to be sufficiently robust and fast to be applied to autonomous vehicles as well as to intelligent vehicles for improving the vehicle safety. © Institution of Mechanical Engineers.

Bhat R.,Indian Institute of Technology Bombay | Kulkarni S.V.,Indian Institute of Technology Bombay | Kulkarni S.,Global Randnter | Hemachander M.,Global Randnter
Proceedings - International Symposium on Discharges and Electrical Insulation in Vacuum, ISDEIV | Year: 2014

In the axial magnetic field (AMF) type of vacuum interrupters (VI), the design of their contact system is such that the magnetic field is oriented parallel to the arc. AMF keeps the arc diffused, and the value of the currentup to which the arc stays diffused depends on the contact diameter and the magnitude of the axial field. A certainminimum AMF is required to keep the arc diffused. AMF also induces eddy currents in the contact discs. This paperanalyses the effect of eddy currents induced in the discs on AMF between the contacts, especially near the currentzero region. This analysis incorporates the opening motion of the contacts along with the variation of the coil currentwith time. Initially, a 2-D axis symmetric model of the AMF contact is simulated to determine the radial variation ofthe magnetic field along a plane mid-way between the two separating contacts. A 3-D model of the AMF contact is then analyzed to include the effect of radial slots in the contact plate. The change in the magnetic field profile with the number of slots is studied. © 2014 IEEE.

Vaze M.,Global Randnter | Kulkarni S.,Global Randnter | Hemachander M.,Global Randnter | Acharya V.K.,Global Randnter | And 2 more authors.
Proceedings - International Symposium on Discharges and Electrical Insulation in Vacuum, ISDEIV | Year: 2014

In the vacuum interrupters employing the radial magnetic field (RMF) type of contacts, the constricted arc column is made to move on the surface of the contacts. The motion of the arc ensures that no particular area of the contact surface is overheated thus minimizing the emission of metal vapor and temperature rise of the contact surface and hence enhancing the current interruption performance. The arc motion is the result of the interaction of the arc current and the magnetic field produced by the flow of the current through the contacts. The velocity of the arc motion would thus be governed by the magnitude of arc current and the design of the contact. Higher the velocity of motion of the arc, higher would be the probability of a successful interruption. A wide range of the values of this velocity and the empirical formulae for the velocity have been reported in the literature. This paper reports the results of a research work which aims to arrive at the value of the arc velocity through experimentation and also through a modeling-simulation approach. The research also aims to establish a correlation between the arc velocity, magnitude of current and the contact design. This correlation is also presented in this paper. © 2014 IEEE.

Pardeshi S.,Global Randnter | Mahajan R.,Global Randnter | Pasumarthi U.,Global Randnter | Arora R.K.,Global Randnter
Proceedings of 2012 IEEE International Conference on Condition Monitoring and Diagnosis, CMD 2012 | Year: 2012

Transformer is one of the vital and costliest components of electrical industry. On-line monitoring is the best solution to prevent the loss of capital. This paper attempts to discuss the product developed which is combination of on-line monitoring and control of power transformer. With this architecture early detection of most of major fault is feasible; it is also possible to monitor most of the critical parts (that affects the health of transformer) with single product. Along with the health monitoring it also provide automatic voltage regulation (AVR) feature. Product also includes features like, oscillo-graphic data storage, real time fault analysis, event information and life estimation. The paper also describes multiprocessor hardware architecture designed to achieve real time information. © 2012 IEEE.

Sellappan A.,Global Randnter | Chandrasekharan M.,Global Randnter | More S.,Global Randnter | Kamble D.,Global Randnter | Janghel D.,Global Randnter
Proceedings - International Symposium on Discharges and Electrical Insulation in Vacuum, ISDEIV | Year: 2014

Vacuum Breakers are now being increasingly utilized at transmission class voltages. The vacuum interrupters in these breakers require considerably longer strokes i.e. open gaps as compared to those in medium voltages. Also the closing and opening speeds are higher. This requirement of longer strokes and higher velocity calls for a special design of bellows and the end components of the vacuum interrupters. This paper presents the results of simulations and experimentation for arriving at guidelines for designing of bellows, especially for bellows having longer stroke lengths. The paper also throws light on the general design guidelines for the design of end components. © 2014 IEEE.

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