Udon Thani, Thailand

Udon Thani Rajabhat University

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

Deeruksa L.,Udon Thani Rajabhat University | Sanchaisuriya K.,Udon Thani Rajabhat University
Acta Haematologica | Year: 2017

This community-based study investigated anemia prevalence and certain hematologic features and their possible relationships to thalassemia and iron deficiency (ID) in a population of older people in Northeastern Thailand. Participants included 319 apparently healthy individuals ranging in age from 60 to 98 years, whose current health status was assessed by means of personal interviews. Blood samples were also collected to determine the following parameters: red blood cell indices, serum ferritin, C-reactive protein, hemoglobin profiles, and the α0-thalassemia gene. Based upon established WHO criteria, the overall prevalence of anemia was found to be 47.7%, increasing from 39% within the age group of 60-70 years to 68% in those >80 years. Factors considered to be significant contributors to anemia were classified as ID (3.6%), thalassemia (56.2%), and “unknown” (40.1%). Overall, only 2.4% of participants exhibited any ID. Hematologic changes appear to correlate with age. Our findings provide not only baseline information, potentially useful for implementing appropriate control measures, but also an enhanced awareness and understanding of the factors contributing to anemia among the elderly in the region. © 2017 S. Karger AG, Basel

Sangpakdee W.,Udon Thani Rajabhat University | Phimphan S.,Surindra Rajabhat University | Tengjaroenkul B.,Khon Kaen University | Pinthong K.,Surindra Rajabhat University | And 2 more authors.
Cytologia | Year: 2017

The cytogenetics of the ornamented pygmy frog (Microhyla fissipes), painted chorus frog (M. pulchra) and narrow-mouthed frog (M. heymonsi) were studied in the aspect of chromosome numbers, morphology and nucleolus organizer region (NOR) locations. For this present study, we provided the karyotype and idiogram of these three species by conventional and Ag-NOR staining techniques. The 10 male and female samples of those three species were collected in Northeast Thailand. The metaphase chromosome preparations were prepared from the bone marrows by the standard protocol. To stain the chromosomes, 10% Giemsa's and 50% silver nitrate were applied. The results showed that all three species had the same diploid chromosome number of 2n=24, and fundamental numbers (NF) were 48 in both males and females. The chromosomes of M. fissipes were comprised of 16m+6sm+XY (X and Y were metacentric chromosomes). M. pulchra had chromosomes consisting of 12m+12sm and M. heymonsi had chromosomes comprising of 18m+6 with no obvious difference in size of sex chromosomes for the two species. M. fissipes and M. pulchra had the same NORs adjacent to the subcentromeric on the long arm of chromosome pair 9, while M. heymonsi had the NOR location on the short arm of chromosome pair 2 close to the centromere. For this case, we suggested that chromosome morphology and the NOR location is still a useful cytological character for taxonomic and evolutionary studies. © 2017 The Japan Mendel Society.

Khumpaitool B.,Udon Thani Rajabhat University | Utara S.,Udon Thani Rajabhat University
Ceramics International | Year: 2017

Lithium chromium nickel oxide (Li0.30Cr0.10Ni0.60O, LCNO) materials were prepared by sol-gel process and calcined at the temperature of 1000°C for 3h. Mechanical mixing process and hot pressing fabricated the composites between LCNO and polyvinylidene fluoride (PVDF). Effects of the amount of LCNO filler on the structure and dielectric properties of LCNO/PVDF composites were investigated. The LCNO/PVDF composites were characterized by thermogravimetric analysis (TGA), Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Furthermore, the dielectric properties of the LCNO/PVDF composites were also investigated. From TGA results, the decomposition step of LCNO/PVDF composites depends on the LCNO content and weight loss decrease with increasing LCNO contents due to the presence of LCNO in PVDF. All LCNO/PVDF composites exhibited two-phase structures of cubic rock-salt NiO structure and α-, γ- phases of PVDF. It is revealed that dielectric constant of the polymer composite increases with increasing LCNO content. This might be due to the formation of micro-capacitor network. The LCNO/PVDF composite with amount of 30wt% showed the best properties with a high dielectric constant of 59.27 and low loss tangent of 0.31 at the frequency of 1kHz and at room temperature. The composite gave a high dielectric constant, which was 2.82 times higher than that of pure PVDF. Therefore, the flexible high dielectric constant and low loss tangent of the composite were weakly frequency dependent, which might be suitable for capacitor applications. © 2017 Elsevier Ltd and Techna Group S.r.l.

Phatai P.,Udon Thani Rajabhat University | Futalan C.M.,AECOM Technology Corporation
Desalination and Water Treatment | Year: 2017

In this work, CeAl and CeAlMnx oxides (x = 0.1, 0.3, 0.5 and 0.7) were prepared using a co-precipitation method and their use for removal of methyl violet dye from an aqueous solution was investigated. The characteristics of the mixed oxides were determined using XRD, FT-IR, UV-vis DRS, SEM and EDX. It was found that cerium, aluminum and manganese ions were homogeneously incorporated into the cubic fluorite structure of CeO2. Moreover, the mixed oxides were found to consist of small grains containing pores, which resulted in a large surface area to volume ratio. Batch adsorption studies were performed to determine the contact time required to achieve equilibrium. The removal of dye by CeAl and CeAlMnx (x = 0.1 and 0.3) attained equilibrium after 60 min, while oxide samples with higher manganese fractions achieved equilibrium in 120 to 150 min. Based on the isotherm data, the adsorption behavior of CeAl was found to follow a Langmuir isotherm (R2 = 0.9951) with a maximum adsorptive capacity of 2.35 mg/g. Results show that the Freundlich model best describes the adsorption of MV dye onto all CeAlMnx formulations. © 2017 Desalination Publications. All rights reserved.

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.

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.

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.

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