Udon Thani, Thailand

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Somsuk K.,Udon Thani Rajabhat University
Proceedings of 2016 8th International Conference on Information Technology and Electrical Engineering: Empowering Technology for Better Future, ICITEE 2016 | Year: 2016

RSA is the best well-known and the most widely used of public key cryptosystem. The advantage of this algorithm is that the senders who have the public key and the receivers who have private key can communicate each other via the unsecured channel secretly. However, the processes of RSA have to take very great computation cost especially in the decryption process. In this paper, the improving decryption process of RSA, is called New Private Key of RSA (d-RSA), is proposed to reduce the computation cost of the decryption process. The key is to find the new private key, which has low Hamming weight while the values of public key and modulus are not changed. With the low Hamming weight, it implies that the computation cost of decryption process of d-RSA is certainly reduced when compared with the same process which has the higher Hamming weight in RSA. Furthermore, it implies that not only the private key which is the inverse of public key modulo Euler function but also the other keys that can decrypt the ciphertext. In addition, with reducing computation cost, the proposed method is the better choice when low power devices are chosen to decrypt the ciphertext. © 2016 IEEE.

Ribas A.,Udon Thani Rajabhat University | Poonlaphdecha S.,Udon Thani Rajabhat University
Zoonoses and Public Health | Year: 2017

The role of amphibians as Salmonella reservoirs has not been as well studied as in reptiles, where the literature is abundant. Recent outbreaks of salmonellosis associated with exotic pet frogs have occurred in United States. Frog farming and wild frog harvesting have increased the international trade in these species. This necessitates a better understanding of the risk of salmonellosis transmission from amphibians to humans. We explored the presence of Salmonella in amphibians (frogs and toads) in Thailand, where farmed and wild frogs as well as toads are present. These live animals are easily found in the local markets and are used as food. Exportation of frog meat from Thailand is common. During March–June 2014, ninety-seven frogs were collected from several habitats, including frog farms, urban areas and protected natural areas. The collected amphibians were tested for the presence of Salmonella. The overall prevalence of Salmonella was 69.07% (90.00% in farm animals, 0% in urban area animals and 44.83% in protected area animals). Eight serovars of Salmonella were isolated: subsp. diarizonae ser. 50:k:z, Hvittingfoss, Muenchen, Newport, Stanley, Thompson, Panama and Wandsworth. Six of the identified serovars, Hvittingfoss, Newport, Panama, Stanley, Thompson and Wandsworth, have been detected in humans in Thailand. According to our results, amphibians are reservoirs of Salmonella and can be a public health concern when used as a source of protein for humans. © 2016 Blackwell Verlag GmbH

Utara S.,Udon Thani Rajabhat University | Klinkaewnarong J.,Udon Thani Rajabhat University
Journal of Sol-Gel Science and Technology | Year: 2016

Abstract: Nanoscale hydroxyapatites (HAps) were successfully synthesized by means of sol–gel method in the presence of ozonolysed natural rubber latex templates of various molecular weights. The thermal properties, functionality, crystallinity and morphology of HAp powder were characterized by simultaneous thermogravimetry and differential scanning calorimetry, Fourier transform infrared spectroscopy, X-ray diffraction and transmission electron microscopy. The results revealed that lower molecular weight ozonolysed natural rubber templates produced spheroidal and less crystalline HAp nanoparticles. A higher molecular weight template produced HAp nano-rod-like particles with higher crystallinity. The results obtained in this work suggest that the molecular weight as well as functionality of the biomacromolecule template affect the phase crystallinity and morphology of synthesized HAp. Graphical Abstract: [Figure not available: see fulltext.] © 2016 Springer Science+Business Media New York

Phetcharat P.,Udon Thani Rajabhat University | Duangpaeng A.,Udon Thani Rajabhat University
Procedia Engineering | Year: 2012

The objectives of this study were to isolate and characterize endophytic bacteria from various rice tissues focusing on their ability to produce indole acetic acid (IAA). Rice tissue samples were collected from different three types of rice farm; 1 year, 3 years organic rice, and conventional rice farms in Udon Thani, Thailand. Seventy-one isolates of endophytic bacteria were screened using PDA and TSA medium. The majority of strains isolated from root tissues were totally 26 isolates, exclusively collected from 3 years organic rice farm. Phenotypic characteristics of all isolates illustrated that 34 isolates were identified as Pesudomonas sp., while other isolates were also identified as Bacillus, Azotobacter, and Enterobacter species. The study of IAA production indicated that 4 isolates efficiently produced IAA over than 10 μg/ml. The O-1-R-4 (2) isolate produced the highest IAA (14.58 μg/ml), and it was identified as Bacillus sp. This effective result will be used for further investigation on the feasibility of commercial production of IAA up-scale fermentation. © 2010 Published by Elsevier Ltd.

Phromloungsri R.,Udon Thani Rajabhat University
2014 International Electrical Engineering Congress, iEECON 2014 | Year: 2014

This paper presents a simple technique to improve the performance of Wilkinson power divider by using step-impedance transmission line (SITLs) compensated microstrip bandstop filter. The proposed power divider employs a pair of SITLs compensated bandstop filters to replace the ordinary 70.7 Ohm quarter-wavelength transmission lines. The main objective of employing the bandpass filters incorporated in the power divider structure is to suppress the spurious response at the 2nd harmonic frequency. Simulated and measured results at 0.9 GHz operating frequency of the ordinary and the proposed Wilkinson power divider are compared. The measured results show that the insertion losses (S21, S31) are less than -4.2 dB while the return losses (S11, S22, S33) are less than -18.3 dB with more than 100% fractional bandwidth. Moreover, the proposed power divider can provide more than 24.5 dB suppression at the 2nd harmonic frequency. © 2014 IEEE.

Semaming Y.,Udon Thani Rajabhat University | Semaming Y.,Chiang Mai University | Pannengpetch P.,Khon Kaen University | Chattipakorn S.C.,Chiang Mai University | Chattipakorn N.,Chiang Mai University
Evidence-based Complementary and Alternative Medicine | Year: 2015

This paper reviews the reported pharmacological properties of protocatechuic acid (PCA, 3,4-dihydroxy benzoic acid), a type of phenolic acid found in many food plants such as olives and white grapes. PCA is a major metabolite of anthocyanin. The pharmacological actions of PCA have been shown to include strong in vitro and in vivo antioxidant activity. In in vivo experiments using rats and mice, PCA has been shown to exert anti-inflammatory as well as antihyperglycemic and antiapoptotic activities. Furthermore, PCA has been shown to inhibit chemical carcinogenesis and exert proapoptotic and antiproliferative effects in different cancerous tissues. Moreover, in vitro studies have shown PCA to have antimicrobial activities and also to exert synergistic interaction with some antibiotics against resistant pathogens. This review aims to comprehensively summarize the pharmacological properties of PCA reported to date with an emphasis on its biological properties and mechanisms of action which could be therapeutically useful in a clinical setting. © 2015 Yoswaris Semaming et al.

Phayom W.,Udon Thani Rajabhat University
Applied Mechanics and Materials | Year: 2014

For increasing energy conversion efficiency of PV module, this study was divided to two experiments. The first experiment was to investigate optimal tilt angle of PV module from 0-35° from horizontal plane in facing south for using in Udon thani Province and neighbouring in Thailand. The second experiment was to decrease PV module temperature and to determine appropriate cooling system by using water and small spray nozzles between front and back PV module. The results found, conversion efficiency was high during 15°-25° from horizontal plane for tilt angle in facing south, especially at 25° in whole year. Using thin film by spray nozzles at the front side was higher open circuit voltage and energy conversion efficiency than back side, with 6.06% of increasing open circuit voltage and 1.93% of increasing energy conversion efficiency when compared with no cooling system, due to can thoroughly distribute water on surface area and easily install. © (2014) Trans Tech Publications, Switzerland.

Charoensawat S.,Udon Thani Rajabhat University | Bohning W.,University of Munster | Bohning D.,University of Southampton | Holling H.,University of Munster
BMC Medical Research Methodology | Year: 2014

Background: A proportional hazards measure is suggested in the context of analyzing SROC curves that arise in the meta-analysis of diagnostic studies. The measure can be motivated as a special model: the Lehmann model for ROC curves. The Lehmann model involves study-specific sensitivities and specificities and a diagnostic accuracy parameter which connects the two. Methods. A study-specific model is estimated for each study, and the resulting study-specific estimate of diagnostic accuracy is taken as an outcome measure for a mixed model with a random study effect and other study-level covariates as fixed effects. The variance component model becomes estimable by deriving within-study variances, depending on the outcome measure of choice. In contrast to existing approaches - usually of bivariate nature for the outcome measures - the suggested approach is univariate and, hence, allows easily the application of conventional mixed modelling. Results: Some simple modifications in the SAS procedure proc mixed allow the fitting of mixed models for meta-analytic data from diagnostic studies. The methodology is illustrated with several meta-analytic diagnostic data sets, including a meta-analysis of the Mini-Mental State Examination as a diagnostic device for dementia and mild cognitive impairment. Conclusions: The proposed methodology allows us to embed the meta-analysis of diagnostic studies into the well-developed area of mixed modelling. Different outcome measures, specifically from the perspective of whether a local or a global measure of diagnostic accuracy should be applied, are discussed as well. In particular, variation in cut-off value is discussed together with recommendations on choosing the best cut-off value. We also show how this problem can be addressed with the proposed methodology. © 2014 Charoensawat et al.; licensee BioMed Central Ltd.

Somsuk K.,Udon Thani Rajabhat University
Lecture Notes in Electrical Engineering | Year: 2015

Pollard Rho is one of integer factorization algorithms for factoring the modulus in order to recover the private key which is the one of two keys of RSA and is kept secret. However, this algorithm cannot finish all values of the modulus. Later, New Factorization algorithm (NF) which is based on Pollard Rho was proposed to solve the problem of Pollard Rho that cannot finish all value of the modulus. Nevertheless, both of Pollard Rho and NF have to take time - consuming to find two large prime factors of the modulus, because they must compute the greatest common divisor for all iterations of the computation. In this paper, the method to speed up NF is presented by reducing the size of the parameter which is used to be one of two parameters to compute the greatest common divisor. The reason is, if the size of one of two parameters is reduced, the computation time for computing the greatest common divisor is also decreased. The experimental results show that the computation time of this method is decreased for all values of the modulus. Moreover, the average computation time of the proposed method for factoring the modulus is faster than NF about 6 percentages. © Springer-Verlag Berlin Heidelberg 2015.

Pattra S.,Chaiyaphum Rajabhat University | Sittijunda S.,Udon Thani Rajabhat University
Energy Procedia | Year: 2015

Response surface methodology (RSM) with central composite design (CCD) was applied to optimize hydrolysis conditions of water-hyacinth stem (WHS). Firstly, the effects of reaction time (h), % diluted H2SO4 concentration (v/v) and shaking speed (rpm) for hydrolyze WHS were investigated. The optimum condition for WHS hydrolysis was reaction time of 7.73 h, H2SO4 concentration of 1.31% (v/v) and stirring speed of 264.41 rpm in which a maximum total sugar of 13 g/L was obtained. Secondly, the hydrolysate WHS obtained from the optimum hydrolysis condition was further used as the substrate for hydrogen production by heat-treated anaerobic sludge. Results showed that the maximum HP of 127. 6 mmol H2/L was obtained. © 2015 The Authors. Published by Elsevier Ltd.

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