Bangkok, Thailand

Ramkhamhaeng University

www.ru.ac.th
Bangkok, Thailand

Ramkhamhaeng University is one of two open universities in Thailand. The university was named in honour of King Ramkhamhaeng the Great of Sukhothai, who traditionally is credited for creating the Thai alphabet.Before the establishment of Ramkhamhaeng University in 1971, Thailand had what has been described as "a crisis in the quest for higher education", since the number of high school graduates seeking competitive place in the government universities far outnumbered the capacity of all universities combined. Parliament finally passed a law authorizing the establishment of Ramkhamhaeng University, the kingdom's first open-admission university.The university is composed of the Faculties of Law, Business Administration, Humanities, Education, Science, Political Science, Economics, Engineering, and Education Technology. The Faculty of Engineering admits a limited number of students, while other faculties are open to anyone who wishes to enroll.Ramkhamhaeng University has two major campuses, both in Bangkok. Freshman classes are held at Bang Na campus in Phra Khanong District. Most others classes are conducted at the main campus at Hua Mak, Bang Kapi District. Wikipedia.

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Veraplakorn V.,Ramkhamhaeng University
Agriculture and Natural Resources | Year: 2016

Lantana camara L., a medicinal plant, exhibits antimicrobial, fungicidal, insecticidal and nematicidal properties. Effective in vitro micropropagation and callus induction aid plant material production for bioactive compound studies and plant resource conservation. Shoot multiplication, root induction and callus formation were investigated. The results indicated a high shoot multiplication rate on Murashige and Skoog (MS) medium supplemented with 16.0 μmol/L N6-benzyladenine (BA). Shoots showed good root regeneration with healthy plantlets on MS medium supplemented with 7.5 μmol/L indole-3-butyric acid. A large callus size occurred with roots at the basal end of shoots on the media added with 20.0 μmol/L or 40.0 μmol/L of 1-naphthalene acetic acid (NAA) combined with 40.0 μmol/L BA. Leaf explants were more suitable for callus induction. Media containing 0.0–40.0 μmol/L BA in combination with 20.0 μmol/L or 40.0 μmol/L NAA could efficiently induce callus formation with the same level of relative growth rate. These plants and callus will be suitable sources of plant material for further study in producing bioactive compounds. © 2016 Kasetsart University


Sahaphong S.,Ramkhamhaeng University
International Journal of Applied Engineering Research | Year: 2016

The aim of this paper is to develop a new mining algorithm to mine all frequent itemsets from a transaction database called the vertical index list (VIL) tree algorithm. The main advantages of the previous algorithms, which are frequent pattern (FP) growth and inverted index structure (IIS) mine, are still useful in a new approach as database scanning only done once, and all frequent itemsets are mined without generating candidate itemsets and the changing in the minimal support threshold is not affected the data structure. IIS - Mine was proposed to reduce the recursive mining steps, nodes construction, and the size of the trees. However, IIS - mine has some drawbacks when the small transaction sets are contributed to early trees, so sub - trees are of the result. To overcome this problem, VIL - Tree has been proposed to mine large transaction sets to get the early long size of frequent itemsets. This is useful when many subsets of frequent itemsets are found, and from it recursive mining steps, nodes, and sub - trees are reduced. The performance of VIL - Tree has been tested with reference to FP - growth and IIS - Mine. The experimental results demonstrate that VIL - Tree provides better performance than the two comparative algorithms in terms of run time and space consumption. © Research India Publications.


Archawaranon M.,Ramkhamhaeng University
Avian Biology Research | Year: 2017

This study aimed to discover whether the Hill Mynah Gracula religiosa forms pairs for a single breeding season or engages in long-term pair bonding, and to investigate the role of female aggression in maintaining pair bonds. Experiments were conducted on captive birds in Thailand between 2006 and 2013, and pair behaviours such as allopreening and aggression were observed four times every day. In the first experiment, when each breeding pair was preparing to rear a new clutch, pairs were placed in a new aviary with unfamiliar males and females with which they could potentially form relationships. Results indicated that breeding pairs stayed with the same mates over four continuous breeding seasons (2006-2009) without changing partners or taking additional mates. In a second experiment, the role of female aggression in maintaining long-term pair bonding was examined. Each breeding pair, when preparing to rear a new clutch, was placed in a new aviary with three unfamiliar females. The results showed that female breeders displayed vigorous aggression towards the other three females, forcing them to retreat from the pair; this behaviour was sustained over four continuous breeding seasons (2010-2013). Thus, it is suggested that the Hill Mynah engages in long-term pair bonding and that the aggression of the breeding female is an essential component in the maintenance of pair-bonds.


Archawaranon M.,Ramkhamhaeng University
Avian Biology Research | Year: 2017

Little is known about the selective pressures driving monogamy in the Hill Mynah (Gracula religiosa). Thus, this study investigated the male's role during reproduction to understand the evolutionary advantages of the monogamous mating system. Experiments were performed on captive birds in Thailand from 2012-2015. In the first experiment, I recorded allopreening and nest-entry frequency/duration from both parents during three periods: nesting, incubation, and feeding of offspring. Females preened their mates significantly more than males did. Moreover, female allopreening was significantly correlated to male parental care (as indicated by nest-entry data), especially when nestlings were 1-20 days old. In the second experiment, males were removed from various nests either when incubation began or when nestlings were 1, 11, or 21 days old. Solitary females were significantly less successful at incubating and raising young, which also weighed less than broods from biparental nests. Therefore, male parental care is likely required for nestling survivability and reinforces monogamy in the Hill Mynah.


Foithong S.,King Mongkut's University of Technology Thonburi | Pinngern O.,Ramkhamhaeng University | Attachoo B.,King Mongkut's University of Technology Thonburi
Expert Systems with Applications | Year: 2012

In this paper, we introduced a novel feature selection method based on the hybrid model (filter-wrapper). We developed a feature selection method using the mutual information criterion without requiring a user-defined parameter for the selection of the candidate feature set. Subsequently, to reduce the computational cost and avoid encountering to local maxima of wrapper search, a wrapper approach searches in the space of a superreduct which is selected from the candidate feature set. Finally, the wrapper approach determines to select a proper feature set which better suits the learning algorithm. The efficiency and effectiveness of our technique is demonstrated through extensive comparison with other representative methods. Our approach shows an excellent performance, not only high classification accuracy, but also with respect to the number of features selected. © 2011 Elsevier Ltd. All rights reserved.


Rodtook A.,Ramkhamhaeng University | Makhanov S.S.,Thammasat University
Journal of Visual Communication and Image Representation | Year: 2013

Segmentation of ultrasound (US) images of breast cancer is one of the most challenging problems of the modern medical image processing. A number of popular codes for US segmentation are based on a generalized gradient vector flow (GGVF) method proposed by Xu and Prince. The GGVF equations include a smoothing term (diffusion) applied to regions of small gradients of the edge map and a stopping term to fix and extend large gradients appearing at the boundary of the object. The paper proposes two new directions. The first component is diffusion as a polynomial function of the intensity of the edge map. The second component is the orientation score of the vector field. The new features are integrated into the GGVF equations in the smoothing and the stopping term. The algorithms, having been tested by a set of ground truth images, show that the proposed techniques lead to a better convergence and better segmentation accuracy with the reference to conventional GGVF snakes. The adaptive multi-feature snake does not require any hand-tuning. However, it is as efficient as the standard GGVF with the parameters selected by the "brutal force approach". Finally, proposed approach has been tested against recent modifications of GGVF, i.e. the Poisson gradient vector flow, the mixed noise vector flow and the convolution vector flow. The numerical tests employing 195 synthetic and 48 real ultrasound images show a tangible improvement in the accuracy of segmentation. © 2013 Elsevier Inc. All rights reserved.


Surapong P.,Ramkhamhaeng University
BMEiCON 2015 - 8th Biomedical Engineering International Conference | Year: 2016

A small current through low frequency is able to treat patients by attenuating or malfunctioning mechanism of microbes which flow through the blood. In addition, the performance delivery of oxygen and nutrients in blood are improved. With the advance, blood viscosity and hematocrit are coincidentally approached to normal level, adaptive flow-rate. This paper proposes the conceptual design of an electrotherapeutic device used for modality application. The design is based on a certain square wave varied from 4 to 5 Hz with a stimulating current and voltage adapted from 0.241mA to 1.027mA and from 15Vpp to 64Vpp, respectively. Applying the wave form to blood model in testing environment, the experimental results show that the viscosity is reduced to satisfy level. © 2015 IEEE.


Yeemin T.,Ramkhamhaeng University
Phuket Marine Biological Center Research Bulletin | Year: 2012

We examined the survival of juvenile coral colonies following the 2010 coral bleaching event at eight study sites in the Similan Islands, the Andaman Sea. Density of juvenile corals differed significantly between time, location and major genera. The lowest bleaching impact on juvenile coral colonies was recorded at Christmas Point Rock, a deep study site (20-25m) on the west of the Similan Islands.Most juvenile coral colonies of Pavona spp., Diploastrea heliopora, Leptastrea spp. and Cyphastrea spp. were the least impacted. There was also high survival of juvenile coral colonies of Goniastrea spp., Fungia spp., Acropora spp. and Porites spp. and large coral colonies (>5 cm diameter) of Dendrophyllia micranthus, Fungia fungites and Porites lutea. The findings of this study suggest a high potential for coral recovery at temporarily closed diving sites because of the large number of juvenile colony survivors. It is necessary to implement science-based management plans for marine protected areas to cope with climate change and anthropogenic disturbances.


Sutthacheep M.,Ramkhamhaeng University
Phuket Marine Biological Center Research Bulletin | Year: 2012

The impact of elevated water temperatures in May-August 2010 on coral assemblages at Kut Island, in the eastern Gulf of Thailand was assessed by quantifying the changes of live coral cover before and after the 2010 bleaching phenomenon at three study sites. The coral mortality as a result of the bleaching varied significantly among the three study sites. Corals at Ao Kralang had the highest percentage mortality (45%) whereas Ao Phrao had the lowest (26%), the latter site being subject to relatively high water-flow. Substantial differences in mortality were found among coral taxa. Fungiids showed the lowest percentage mortality (<5%) while all observed colonies of Montipora spp., Acropora spp. and Pocillopora damicornis completely died. Recovery of these corals will depend on recruitment from neighboring reefs where some surviving colonies were observed.


Rodtook A.,Ramkhamhaeng University | Makhanov S.S.,Thammasat University
Pattern Recognition | Year: 2010

We propose a modification of the generalized gradient vector flow field techniques based on a continuous force field analysis. At every iteration the generalized gradient vector flow method obtains a new, improved vector field. However, the numerical procedure always employs the original image to calculate the gradients used in the source term. The basic idea developed in this paper is to use the resulting vector field to obtain an improved edge map and use it to calculate a new gradient based source term. The improved edge map is evaluated by new continuous force field analysis techniques inspired by a preceding discrete version. The approach leads to a better convergence and better segmentation accuracy as compared to several conventional gradient vector flow type methods. © 2010 Elsevier Ltd. All rights reserved.

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