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Heat and mass transfer of infant radiant warmer by computer simulation
(2013-12-01)
Roongprasert, K.
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Phasukkit, P.
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Pintavirooj, C.
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Sangworasil, M.
This paper presents an analysis of heat transfer from the surrounding area skin of newborn under using infant radiant warmer (IRW) by finite element three-dimensional software. And to compare the results of heat transfer measurements from experiments on the IRW in used everywhere. In this study, results are obtained for a simplified model. It is equipped with. Systems design, the properties of materials and processing methods using finite element three-dimensional software. The results of the simulation using COMSOL Multiphysics 3.5a programs will be compared with the experimental results of heat transfer in newborn skin mounted on the IRW. The criteria are in the form of a temperature graph that is installed in a location that is designed to provide a virtual environment as far as possible. To ensure the accuracy of the experimental verification of the simulation method, the finite element model at 3 D. In order to make the research more easily add features in the future. © 2013 IEEE.
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Comparision of open slot angle for asymmetry slot antenna using 3D finite element method
(2011-12-01)
Thaiwat, K.
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Nantivatana, P.
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Phasukkit, P.
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Tungjitkusolmun, S.
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Sangworasil, M.
This paper presents analysis of asymmetry slot antenna configuration for microwave ablation at 2450 MHz using three-dimensional finite element analyses treatment for liver tissue. We designed new coaxial-slot antenna is opened slot at one-side of antenna. We study heat transfer for liver tissue by used MW Ablation system, varying the angle of open slot at 90°, 180°, 270° and 360°. The results illustrate that the coaxial-slot asymmetry structure antenna can be used in microwave ablation for treatment of the liver cancer tissue. Areas of treatment depend on angle of open slot, power and operated time which we can control destruction of the cancer cell in the area closed to the very fragile tissue or blood vessel. © 2011 IEEE.
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EMG signal feature extraction based on Wavelet transform
(2010-07-30)
Mahaphonchaikul, K.
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Sueaseenak, D.
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Pintavirooj, C.
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Sangworasil, M.
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Tungjitkusolmun, S.
In this paper, a multi-channel electromyogram acquisition system using programmable system on chip (PSOC) microcontroller was used to obtain the surface of EMG signal. Two pairs of single-channel surface electrodes were used to measure and record the EMG signal on forearm muscles. Then, different levels of Daubechies Wavelet family were performed to analyze the EMG signal. Finally, features in terms of root mean square, logarithm of root mean square, centroid of frequency, and standard deviation were used to extract the EMG signal. The experimental results show that root mean square feature extraction method exhibits better performance for extracting the EMG signal compared to the other features. In the future, our method can be utilized to control a mechanical arm in real-time processing.
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Development of wireless electronic nose for environment quality classification
(2010-07-30)
Pogfay, T.
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Watthanawisuth, N.
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Pimpao, W.
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Wisitsoraat, A.
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Mongpraneet, S.
The ambient air quality in the live stock farm has an effect heath of animal. Therefore, we have developed a device for monitoring air quality of environment. In this work, wireless electronic nose has developed by deploying commercial gas sensor arrays, microcontrollers and ZigBee wireless network. They system is applied for environment classification in various laboratories including biological, chemical and clean rooms. Air data measured by multi-sensor array are delivered via ZigBee network to a database station where PCA as linear explorative technique analysis is used to obtain odor dispersion and environment prediction. The air environment of various laboratories has been successfully classified by the developed system. Thus, the wireless electronic nose approach is potential for automatic environment monitoring with many industrial applications including livestock farm environmental control.
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2D ultrasonic reflection tomography by linear array transducer and wave reflector
(2009-11-16)
Sanpanich, A.
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Hamamoto, K.
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Sangworasil, M.
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Pintavirooj, C.
In general, it was known that when the series of an ultrasonic broadband pulse travel through living organ or soft tissue, their reflected projection data can be used to reconstruct a novel tomographic image. Whereas, a data obtain from an ultrasonic tomography in transmission mode is not able to be used for reconstruction a characteristic image of soft tissue which naturally shadowed by a bone or hard tissue. An ultrasonic tomography in reflection mode is realized to be a solution for this problem. However the implementation to identify the projection by using an integrated attenuation coefficient of tissue from the pulsed wave ray path in reflection mode is still more complicated. In this paper, we propose a simulation in 2D of a reflection-mode ultrasonic tomographic system by using the linear array transducer and also a frequency centroid shift method to calculate the projection data. The imaging setup system was enhanced by wave reflecting plate in order to increase an echo wave path. The ultrasound wave paths of our simulation system were intend to focus on the fan beam trajectory which is rather close to a real propagation of the ultrasound wave traveling through soft tissue and ART was used finally as an image reconstruction algorithm. The obtained output shows that our system is more practical and possible toward for using in a clinical trial.
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Fabrication of QCM sensor array and PDMS micro chamber for biosensor applications
(2009-10-22)
Jaruwongrungsee, K.
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Maturos, T.
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Wong-ek, K.
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Sangworasil, M.
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Pintavirooj, C.
In this work, an array of quartz crystal microbalance (QCM) sensors is fabricated on a single quartz crystal substrate and attached with poly(dimethylsiloxane) (PDMS) micro chamber for using in flow-injection system. The Cr/Au electrode array is deposited on both side of quartz substrate by sputtering through electroplated microshadow mask. PDMS micro chamber was fabricated by mold casting technique with SU-8 mold. Fabricated PDMS micro chamber and QCM sensor array were attached together for using in flow-injection system. In our experiment, the QCM electrodes were coated with the carboxylic poly(vinyl chloride) (PVC-COOH) and then the carboxylic group was activated with carbodiimide hydrochloride (EDC) and N-hydroxylsuccinimide (NHS) for protein binding. The scanning electron micrograph shown the trapped protein on the modified sensing layer, it confirmed that our QCM sensor and PDMS micro chamber can be used as QCM biosensor array. This new QCM sensor array provide possibility of multiple detection in small amount of sample within a single quartz crystal substrate that avoid the error signal from the different properties of each sensor in an array. ©2009 IEEE.
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Audio watermarking technique using binary image in wavelet domain
(2007-12-01)
Charmchamras, B.
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Kaengin, S.
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Airphaiboon, S.
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Sangworasil, M.
The technology of embedding image data into the audio signal and additive audio watermarking algorithm based on SNR to determine a scaling parameter was researched. The audio based on DWT. The intensity of embedded watermarks on the original audio signal is modified by adaptively modulation of the scaling parameter. Experimental result demonstrate that the watermark is inaudible and this algorithm is robust to many operations of digital audio signal processing, such as, resampling, lowpass filter and so on. The extracted watermark image quality is shown by considering normalize correlation (NC) value with a suitable scaling parameter for embedding. ©2007 IEEE.
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Experimental investigation of arbitrary-orientation cone-beam X-ray tomography
(2007-01-01)
Chanwimalueang, T.
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Sangworasil, M.
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Pintavirooj, C.
X-ray Computed Tomography is a technique to reconstruct an image of trans-axial slab of the object from a series of x-ray radiographs taken at a prior-known angle. Sequences of x-ray radiographs are served as two-dimensional projection data for a 3D tomography. The most popular Feldkamp Algorithm which is based on Filtered Backprojection (FBP) approaches has shown to perform well for 3D reconstruction. In the case of limited view, however, Feldkamp Algorithm suffers from star artifact. In these scenarios, an algebraic reconstruction technique such as the Simultaneous Algebraic Reconstruction Technique (SART) is engaged for reconstructing tomograms. Conventional x-ray computed tomography was implemented on a c-arm x-ray apparatus where the x-ray source and detector is capable of rotating to capture radiograph at any specific angle. The implementation of conebeam - geometry reconstruction algorithm, however, requires that the center location of the detector is accurately identified. Any slightly-missed alignment of the x-ray source or the detector could result in the error of the position of the center and hence the error in reconstructed image. Consequently, x-ray radiography tomography is normally implemented on a c-arm x-ray apparatus where the correct orientation of x-ray tube with respect to x-ray detector is achievable. The aim of this paper is to implement the x-ray tomography on a non c-arm x-ray apparatus where the x-ray source can be in any orientation with respect to x-ray detector. To determine the orientation, we take the radiograph of the reference transparent object, say the plastic box, of which the coordinate of the landmark, say the corner point, is known. The shadowgram of the box is analyzed to extract the coordinate of landmark image and to determine the orientation matrix using classical direct linear transform method (DLT). Once the orientation is known, modified conebeam tomography is performed to derived 3D reconstruction volumetric data. The experimental results demonstrated the potential of such method.
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A cluster-based geometric approach to WLAN location determination systems
(2006-12-01)
Sungkhachan, P.
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Supnithi, P.
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Phasukkit, P.
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Sangworasil, M.
This paper presents an improvement in deterministic WLAN location determination system using triangulation method. It is a client-based approach which the online location estimation phase, K possible estimates are produced, location estimate is computed as the midpoint of all possible coordinates. The results show that locations with large estimation errors can be drastically reduced thus improvement in prediction error compared with traditional methods.
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3D modeling from multiple projections with arbitrary-posed camera
(2006-12-01)
Gimjumpa, S.
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Narkbuekaew, W.
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Sangworasil, M.
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Pintavirooj, C.
Tomographic imaging is a technique for exploration of a cross-section of an inspected object without destruction. In this research, the series of photographs taken around the opaque object under the ambient light is completely served as the projections- the so-called photo-graphic tomography. From the process of tomography, the outcome is the stack of pseudo cross-sectional image. Not the internal of cross section is authentic, but the edge or contour is valid. In this paper, the concept for 3D modeling using photographic tomography was extended to the case where the camera pose can be varied arbitrary. In such case, camera pose is determined using general camera modeling technique. The extracted geometric transform matrix is used to reorient reconstructed data before implementing the traditional tomographic process. The simulation result is very promising. © 2006 IEEE.

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