Chivapreecha, Sorawat
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Chivapreecha, Sorawat
Alternative Name
Chivapreecha, S.
Chivapreecha, Sorwat
Main Affiliation
Email
sorawat.ch@kmitl.ac.th
55 results
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Item type:Publication, CubeSat image transmission in JPEG compression: An experiment on high altitude platform(2016-03-23); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Morphology-based algorithm and application for mammographic masses segmentation(2013-01-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A Cubic Hermite variable fractional delay filter(2011-12-01); Pradabpet, ChusitThis paper presents a design and realization of cubic Hermite variable fractional delay (VFD) filter. Cubic Hermite interpolation will be formulated to cubic Hermite VFD filter which the amplitude response and delay response of proposed cubic Hermite VFD filter depend on the used approximation of first derivative. The structure realization of cubic Hermite VFD filter is shown based on Farrow structure as well. Finally, the amplitude response and delay response of the proposed cubic Hermite VFD filter will be compared with the cubic B-spline and Lagrange-type VFD filter. © 2011 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Variable to variable crossover in GA to solve PAPR reduction in OFDM systems(2014-02-12); Soontornwong, ParinyaThe hybrid of partial transmit sequences (PTS) and cascade adaptive peak power reduction (CAPPR) methods have been used to reduce peak to average power ratio (PAPR) of orthogonal frequency division multiplexing (OFDM) system. When number of sub-block increases, PAPR is getting small. However, the calculation cost of its selection must be considerably large. We introduce variable to variable crossover in GA, the total calculation cost becomes drastically reduced. The parameter for simulation used standard WLAN in IEEE 802.11a system. In simulation results, the proposed method shows the improvement performance PAPR and bit error rate (BER) of an OFDM system. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Selecting an access point for indoor localization system using frequency analysis(2019-07-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Universal biquadratic digital filter with tunable capability(2011-12-01)This paper presents a tunable universal biquadratic digital filter. The transfer functions in z-domain of universal biquadratic digital filter that can give five outputs simultaneously are obtained by bilinear s-z transformation using modified bilinear Pascal matrix. The universal biquadratic digital filter structure has shown before the tunable approach of universal biquadratic digital filter will be derived later. The center frequency and bandwidth of the proposed tunable universal biquadratic digital filter can be tuned by tuning parameters. © 2011 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Development of NOAA satellites ground station: A redundancy system(2012-12-01); Meehuathon, SinghaThis paper aims to introduce a redundant system for NOAA in the Automatic Picture Transmission (APT) mode at the Thailand Ground Receiving Station. The Geo-Informatics and Space Technology Development Agency (GISTDA) has the capability to downlink NOAA satellites data in High Rate Picture Transmission (HRPT) mode which operates in L-band (1670-1710 MHz). However, if this system fails GISTDA is not able to receive any NOAA data. A redundant system is now considered to prevent or reduce the risk of service outage in case of a downlink failure. The proposed redundant system consists of a low cost antenna, a receiver in Automatic Picture Transmission (APT) mode, recording system, decoder software, database system that can be accessed via the internet. The Antenna and receiver in APT mode are operated in the VHF frequency range (137-138 MHz). Therefore, the cost is lower than the receiving system which operates in HRPT mode. The proposed system also includes a recording system and data processing unit in order to process the satellite images by using the freeware decoder software. All archive images can be viewed via catalogue browsing system and stored in a database system on a server where users can have access to these images via the internet. In addition, such a system is very useful as a backup system for downlink NOAA data from the satellites. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A new key generator for data encryption using chaos in digital filter(2017-10-17); The presented work of this paper is to propose the implementation of chaotic crypto-system with the new key generator using chaos in digital filter for data encryption and decryption. The chaos in digital filter of the second order system is produced by the coefficients which are initialed in the key generator to produce other new coefficients. Private key system using the initial coefficients value condition and dynamic input as password of 16 characters is to generate the coefficients for crypto-system. In addition, we have tension specifically to propose the solution of data security in lightweight cryptography based on external and internal key in which conducts with the appropriate key sensitivity plus high performance. The chaos in digital filter has functioned as the main major in the system. The experimental results illustrate that the proposed data encryption with new key generator system is the high sensitive system with accuracy key test 99% and can make data more secure with high performance. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Wireless intelligent fall detection and movement classification using fuzzy logic(2012-12-01); Global population aging leads to increased interests in preventive healthcare technology. As falls are the most common cause of injury or death in old persons, fall detection and movement classification is one of the key topics in this research area. In this paper we propose a simple wireless intelligent system prototype for fall detection and movement classification for real-time monitoring of the elderly. The portable sensor unit acquires data from a triaxial accelerometer and sends the data wirelessly to a computer using Zigbee technology. Alternative to classic methods, the movement data is analyzed using a fuzzy inference system. The system is designed to distinguish between four movement types: standing, sitting, forward fall, and backward fall. Its classification accuracy is investigated using experimental data. It is observed that the system performs well with high sensitivity and excellent specificity. Additionally, the system is applicable for monitoring rehabilitative patients and is extendable to a larger class of movements and postures. ©2012 IEEE. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Modeling and simulation in passive bistatic radar for detecting target range and velocity application to USRP B-210 SDR(2019-07-01)