Phetchaburi, Thailand

Phetchaburi Rajabhat University
Phetchaburi, Thailand
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Ketcham M.,KING.INFO | Yimyam W.,Phetchaburi Rajabhat University | Chumuang N.,Muban Chombueng Rajabhat University
Advances in Intelligent Systems and Computing | Year: 2016

The segmentation is the first important step for optical character recognition (OCR) system. It separate the image text documents into line, characters and word. The accuracy of the recognition system mainly rely on the algorithm in segmentation. The challenge of segmentation is overlapping therefore this paper presents a new high performance algorithm in the segmentation on Palm leaf manuscript’s Isan Dhamma overlap characters. © Springer International Publishing Switzerland 2016.

Yongsiri K.,Mahanakorn University of Technology | Eiamsa-Ard P.,Phetchaburi Rajabhat University | Wongcharee K.,Mahanakorn University of Technology | Eiamsa-Ard S.,Mahanakorn University of Technology
Case Studies in Thermal Engineering | Year: 2014

This paper presents the results of numerical study of turbulent flow and heat transfer in a channel with inclined detached-ribs. The computations based on the finite volume method, and the SIMPLE algorithm have been implemented. The study encompasses the Reynolds number (based on the hydraulic diameter of a channel) range from 4000 to 24,000. The heat transfer, pressure loss and thermal performance of the inclined detached-ribs with different attack angles (0) of 0°, 15°, 30°, 45°, 60°, 75°, 105°, 120°, 135°, 150° and 165° are examined and compared with those of the typical transverse attached rib with 0 of 90°. The computational results reveal that, at high Reynolds number, the inclined ribs with 0=60° and 120° yield comparable heat transfer rates and thermal performance factors which are higher than those given by the ones with other angles. On the other hand, at low Reynolds number, the effect of rib attack angle is insignificant.

Eiamsa-Ard P.,Phetchaburi Rajabhat University | Piriyarungroj N.,King Mongkut's University of Technology Thonburi | Thianpong C.,King Mongkut's University of Technology Thonburi | Eiamsa-Ard S.,Mahanakorn University of Technology
Case Studies in Thermal Engineering | Year: 2014

Effects of the regularly-spaced twisted tape (RS-TT) on the heat transfer, friction factor and thermal performance factor behaviors in a heat exchanger are reported along with those of a full length twisted tape. The full length (or typical) twisted tapes with two different twist ratios (y=P/W = 6.0 and 8.0), and the regularly-spaced twisted tape (RS-TT) with two different twist ratios (y=6.0 and 8.0) and three free space ratios (s=S/P = 1.0, 2.0, and 3.0) were employed for comparative study. The article also presents the application of a mathematical model for numerical simulation of the swirling flow in a tube induced by regularly-spaced twisted tape (RS-TT) insertion. The numerical simulation was performed in order to gain an understanding of physical behavior of the fluid flow (decaying swirling flow field), fluid temperature and local Nusselt number characteristics of a tube fitted with RS-TT in the turbulent flow regime. The Navier-Stokes equation in common with the energy equation was solved using the SIMPLE technique with the RNG k-ε turbulence model. The experimental results show that heat transfer rate and friction increased with decreasing twist ratio and space ratio. At similar conditions, full length twisted tapes (s=0) offered higher heat transfer rate, friction factor and thermal performance factor than RS-TT ones (s = 1.0, 2.0 and 3.0) as they induced more consistent swirling flows and thus turbulence. This reveals that it is possible to gain promising tradeoff between enhanced heat transfer and increased friction by selecting the twisted tape with proper geometries.

PubMed | Australian National University, University of Wollongong, Srinakharinwirot University and Phetchaburi Rajabhat University
Type: Journal Article | Journal: Bioorganic & medicinal chemistry letters | Year: 2016

Sunitinib (Sutent) is a receptor tyrosine kinase (RTK) and angiogenesis inhibitor approved for the treatment of renal cell carcinomas, gastrointestinal stromal tumours and pancreatic neuroendocrine tumours. A key structural motif retained throughout medicinal chemistry efforts during sunitinibs development was the indoline-2-one group. In the search for new anti-angiogenic scaffolds, we previously reported that non-indoline-2-one-based derivatives of semaxanib (SU5416, a structurally simpler sunitinib predecessor that underwent Phase III trials) are active as angiogenesis inhibitors, indicating that the group is not essential for activity. This Letter describes the synthesis and structure-activity relationships of another class of non-indoline-2-one angiogenesis inhibitors related to sunitinib/semaxanib; the 5,7-dimethyl-2-aryl-3H-pyrrolizin-3-ones. A focussed library of 19 analogues was prepared using a simple novel process, wherein commercially available substituted arylacetic acids activated with an amide coupling reagent (HBTU) were reacted with the potassium salt of 3,5-dimethyl-1H-pyrrole-2-carbaldehyde in one-pot. Screening of the library using a cell-based endothelial tube formation assay identified 6 compounds with anti-angiogenesis activity. Two of the compounds were advanced to the more physiologically relevant rat aortic ring assay, where they showed similar inhibitory effects to semaxanib at 10g/mL, confirming that 5,7-dimethyl-2-aryl-3H-pyrrolizin-3-ones represent a new class of angiogenesis inhibitors.

Boonrod K.,King Mongkut's University of Technology Thonburi | Boonrod K.,Phetchaburi Rajabhat University | Towprayoon S.,King Mongkut's University of Technology Thonburi | Bonnet S.,King Mongkut's University of Technology Thonburi | Tripetchkul S.,King Mongkut's University of Technology Thonburi
Resources, Conservation and Recycling | Year: 2015

This paper explores organic waste separation behavior at the source when various motivation mechanisms are implemented. Four mechanisms are applied in pilot areas to observe the differences in behavior. A traditional mechanism is introduced to the community as the first campaign followed by a voluntary mechanism, which is another non-economic incentive mechanism. Next, two economic incentive mechanisms, namely, a reward mechanism and a community business mechanism, are applied. These four mechanisms were applied in the Nakhon Ratchasima metropolitan area, one of the largest commercialized cities in northeastern Thailand, in 2010. The study found that the traditional mechanism yields a 19% organic waste separation efficiency. When the voluntary mechanism is applied, the efficiency increases to 36%. The economic incentive mechanism further increases the waste separation behavior: the reward mechanism increases the efficiency to 51%, and the community business mechanism is the best mechanism, with an efficiency of 58% being observed. The study also found that housing style influences the quantity of organic waste separation, while community style influences the quality of organic waste separation. These results are helpful in devising appropriate management plans for enhancing waste management practices, which will directly improve the sustainability of using organic waste in future energy projects. © 2014 Elsevier B.V.

Jansukpum K.,Wuhan University | Kettem S.,Phetchaburi Rajabhat University
Proceedings - 14th International Symposium on Distributed Computing and Applications for Business, Engineering and Science, DCABES 2015 | Year: 2015

Base on innovation resistance theory, this research builds the model of factors affecting consumers' resistance in using online travel in Thailand. Through the questionnaires and the SEM methods, empirical analysis results show that functional barriers are even greater sources of resistance to online travel website than psychological barriers. Online experience and independent travel experience have significantly influenced on consumer innovation resistance. Social influence plays an important role in this research. © 2015 IEEE.

Wiboonsirikul J.,Phetchaburi Rajabhat University | Mori M.,Kyoto University | Khuwijitjaru P.,Silpakorn University | Adachi S.,Kyoto University
International Journal of Food Properties | Year: 2013

Okara was treated with subcritical water at temperatures ranging from 170 to 260°C for various times. After clarification, the extracts were analyzed for their protein and carbohydrate contents, DPPH radical scavenging activity, and antioxidative activity. The carbohydrate content significantly decreased with the increasing treatment temperature and time. The protein content, however, increased with the increasing treatment temperature and slightly decreased with a heating time longer than 10 min. The extract obtained from the subcritical water treatment at 240°C for 5 min, which would be used to evaluate the antioxidative activity, provided the relatively highest radical scavenging activity and the activity tended to decrease with the prolonging heating time and temperature. The extract also exhibited a suppressive activity to the autoxidation of linoleic acid with the increasing weight ratio of the extract to linoleic acid. The results clearly showed okara still contained highly valuable substances for human consumption. Copyright © 2013 Taylor & Francis Group, LLC.

Khansalee E.,Chulalongkorn University | Zhao Y.,Chulalongkorn University | Nuanyai K.,Phetchaburi Rajabhat University
Proceedings - 2015 7th International Conference on Information Technology and Electrical Engineering: Envisioning the Trend of Computer, Information and Engineering, ICITEE 2015 | Year: 2015

Wireless communication systems are widely used in our daily lives, thus the power density of ambient radio frequency (RF) energy highly increased accordingly. Therefore, the energy harvesting system can be applied to recycle the energy to use with small devices such as sensor devices which consume only a small amount of energy. Furthermore, the application can be modified to use with wireless chargers and power detectors. The system consists of a rectifier circuit and an antenna. The RF energy is harvested by the antenna and the received RF signal is converted to be direct current (DC) power by rectifier circuit, thus the performance of the system will depend on the quality of the antenna and the efficiency of the rectifier circuit. The high efficiency rectifier can be achieved by the low power dissipation in the diode and the optimal impedance of the matching between the receiving antenna and the rectifier circuit. This paper proposes the source-pull simulation to determine the optimal impedance matching for the rectifier that can provide 35.53% of the maximum efficiency with 1.09 V of the DC output voltages and 3.16 mA of the DC load currents at 10 dBm of the input power by 2.42 GHz of continuous wave signal. At 2.1 GHz, the circuit can provide 26.41% of the efficiency with 0.939 V of the DC output voltages and 2.75 mA of the DC load currents at 10 dBm of the input power. For the broadband performance the circuit can provide the efficiency higher than 27% from 2.4 GHz to 2.5 GHz of the operation frequency and the efficiency more than 25% for the frequency from 2.1 GHz to 2.2 GHz at 10 dBm of the input power. © 2015 IEEE.

Wiboonsirikul J.,Phetchaburi Rajabhat University
International Food Research Journal | Year: 2016

Pasteurized palm sap is well known juice in many tropical countries. It has unique flavor and taste but is not available throughout year. Consequently there are many palm sap manufacturers trying to increase their production quantities by addition of other substances such as water and other cheaper syrups or sugar. The objective of this research was to discriminate the commercially pasteurized palm sap samples into adulterated and non-adulterated groups using their physical and chemical properties combined with canonical discriminant analysis. The result found that six from nine variables including total soluble solid, reducing sugar, titratable acidity, pH, L*, and b* values were selected for the discriminant analysis. A good discrimination between the non-adulterated and adulterated samples was attained by applying one canonical discriminant function, which provided 100% of the 14 palm sap samples correctly classified. While L* and b* values as well as total soluble solid were found to be the most important predictor variables for the classification of the adulterated palm sap samples, the reducing sugar, titratable acidity, and pH value were of the most significance for that of the non-adulterated ones. © All Rights Reserved.

PubMed | Phetchaburi Rajabhat University
Type: Journal Article | Journal: Journal of oleo science | Year: 2016

Stearoyl ascorbate or 6-O-stearoyl l-ascorbate is a lipophilic derivative of l-ascorbic acid and is commercially used in foods as a fat-soluble antioxidant and surfactant to overcome the disadvantages of using l-ascorbic acid. The objective of this research is to evaluate the antioxidative ability of stearoyl ascorbate, in the presence of wheat starch or gluten as a matrix, by measuring the unoxidized methyl linoleate available in the mixture of them after oxidation under accelerated conditions compared to that when using ascorbic acid. We observed that stearoyl ascorbate and ascorbic acid exhibited mutually adjacent antioxidative ability against oxidation of the methyl linoleate at a molar ratio of 0.0001 in presence of either wheat starch or gluten. In addition, the oxidation process in the mixture containing either stearoyl ascorbate or ascorbic acid was significantly slower than that in the mixture without stearoyl ascorbate or ascorbic acid. Moreover, by altering the initiation and propagation periods of the oxidation process, the mixture containing the stearoyl ascorbate and gluten as the matrix exhibited conspicuously slower oxidation than the mixture containing either the wheat starch or stearoyl ascorbate alone. However, increase in the ratio of stearoyl ascorbate to methyl linoleate to 0.001 or higher resulted in adverse effects due to acceleration of the oxidation process.

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