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Climate change due to global warming has incredibly contributed potential risk to the agricultural farming system. The collective responsibility to advocate food security and sustaining the farming system is a key issue. While the conventional farming techniques have combated to meet global food demands, however sustaining food security to provide access to safe and nutritious food is at probable...
This work portrays the development of wireless smart shoe for gait analysis. Force sensitive resistors (FSRs) and resistive bend sensor were employed by mounting onto a shoe for detection of pressure distribution beneath the foot during normal and abnormal walking. In the present study, we have been interested in 3 walking postures including normal walking, tiptoe walking and dragging foot walking...
We report about the manufacturing of sensor devices for detection of volatile organic compounds (VOCs) in the air. The sensor comprises three fully inkjet-printed layers of (i) silver interdigitated electrodes (SIDE), (ii) multi-walled carbon nanotubes (MWCNTs) and (iii) poly (styrene-co-maleic acid) partial isobutyl/methyl mixed ester (PSE). We have found that inkjet printing of MWCNT layers and...
The identification of volatile organic compounds (VOCs) presented in exhaled human breath can provide direct evidence of the health status of patients. Electronic nose (e-nose) has been known as an efficient technique for odor classification of numerous products, living and non-living objects and environment. In this work, an optical e-nose system that consists of organic thin film gas sensor and...
This paper presents the development of a low cost wireless data shoe system for monitoring human locomotion. The sensor unit consists of 3 force sensing resistors (denoted by FSR located at ball, lateral border and heel) and 3-axis acceleration sensor (ADXL335). Pressure and acceleration data were sampled at 10 Hz, which is sufficient for various activities such as sitting, standing, walking and possibly...
In this paper, we have developed a sleep monitoring and gesture recognition system for patient based on polysomnography which will be useful for patient communication with healthcare personals and/or relatives. In particular, we present the sensor pillow system that employs wireless networks based on low-cost ZigBee technology and a sensor array of force sensitive resistors (FSR) based on polymer...
This research is a part of smart farm system in the framework of precision agriculture. The system was installed and tested over a year. The tractor tracking system employs the Global Positioning System (GPS) and ZigBee wireless network based on mesh topology to make the system communicate covering a large area. Router nodes are used for re-transmission of data in the network. A software was developed...
Artificial nose has recently become an emerging instrument for quality assurance in the food industry. These paper presents the optical gas sensors based on Magnesium - 5,10,15,20 - tetra phenyl - porphyrin (MgTPP) and Zinc - 5,10,15,20 - tetra phenyl - porphyrin (ZnTPP) thin films and their application as an artificial nose. Based on the measurement of optical absorbance response using a general...
An electronic nose (e-nose) system based on polymer/carboxylic-functionalized single-walled carbon nanotubes (SWNTs-COOH) was developed for sensing various volatile amines such as dimethylamine, dipropylamine, pyridine, and ammonia solution. The SWNTs-COOH were dispersed in the matrix of different polymers; polyvinyl chloride (PVC), cumene terminated polystyrene-co-maleic anhydride (cumene-PSMA),...
Monitoring microenvironment at the farm level has recently become one of the hottest topics in precision agriculture. Zigbee technology is then the most prospective candidate for wirelessly networking those field sensors due to its low cost and power consumption and flexible architecture. The microclimate monitoring system in this research is a suit of equipments based on Zigbee networking to measure...
PEDOT:PSS has been used recently into many organic-based devices in order to help charge transfer and improve efficiency of the devices. PEDOT:PSS exhibit various interesting properties. It posses relatively good electrochemical, ambient, and thermal stability of its electrical properties as compared with the other polythiophenes. One aim of manufacturing organic-based device is to lowering the fabrication...
In this paper, a mobile electronic nose (E-nose) based on novel hybrid carbon nanotube-SnO2 gas sensors is described. The instrument combines new feature extraction techniques including integral and primary derivative, which leads to higher classification performance comparing with the classical features ( Delta R and Delta R/R0). The results show that doping of carbon nanotube (CNT) improves the...
Organic light emitting devices have been fabricated using a new anthracene derivative; 9,10-bis(dodecylthio) anthracene (ADT). In this paper, ADT was used as dopant and emitter in PVK host matrix by spin-coating the layers of the doped polymer onto the cleaned indium tin oxide coated glass (ITO) / 3,4-polyethylene-dioxythiophene:polystyrene sulfonate (PEDOT:PSS) substrates. At room temperature the...
Wine is a very famous beverage in the world. It is an alcoholic beverage made by fermentation of grape juice. The environmental conditions and the skills of winemaker are important factors that determine the quality of wine. Thailand has over the years developed and presented wine of high quality to global wine market. Because of sub-tropical climate of Thailand, winemakers have to understand the...
In this paper, we have investigated the sensing properties of magnesium - 5,10,15,20 - tetraphenyl - porphyrin (MgTPP) to various volatile organic compounds (VOCs). The spin-coated MgTPP thin films were subjected to thermal annealing and methanol-vapor exposure to study the effects of pre-treatment on the sensing properties. Atomic force microscopy (AFM) has shown that both pre-treatment techniques...
Electronic nose devices are of increasing interest for the quality control of beverage and food processing. Optical gas sensors that require low electrical power are in great need for such devices. Magnesium 5, 10, 15, 20-tetraphenylporphyrin thin film sensors have been fabricated by spin coating onto glass substrates for detecting specific alcoholic volatile organic compounds (VOCs). Responses of...
Humidity strongly effects the sensitivity of odor sensors. It is therefore a major problem in the use of electronic nose (E-nose) for most applications including detecting human body odor from armpits, where humidity at the armpits can varies to a large extent due to various human activities. In this paper, we propose both hardware and software approaches to correct the humidity effect. The E-nose...
Metallo-porphyrins thin films have been demonstrated as optical gas sensors for detecting various kinds of gases. In this work, magnesium 5,10,15,20-tetraphenyl porphyrin (MgTPP) thin films were prepared by spinning the solution using chloroform as solvent onto clean glass substrates, then subjected to a thermal annealing at 280degC in the argon atmosphere. These MgTPP optical gas sensors have higher...
In this paper, organic thin films based on two types of metal-macromolecules, i.e., zinc-2,9,16,23-tetra-tert-butyl-29H,31H-phthalocyanine (ZnTTBPc) and zinc-5,10,15,20-tetra-phenyl-21H,23H-porphyrin (ZnTPP), were demonstrated to discriminate among diverse volatile organic compounds (VOCs) even if they have very similar functional group. The ZnTTBPc and the ZnTPP thin films have been prepared by spin...
The interactions between various single-walled carbon nanotubes (SWNTs) and water molecules have been studied using first principles calculations and molecular dynamics (MD) simulations. The SWNTs were modeled by varying the diameter ranging from the chiral vector (6,0) to (9,0), and by modifying the terminal ends with hydroxyl (-OH) and carboxyl (-COOH) functional groups for the nanotubes having...
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