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Mae Moh Lignite Mine and Environmental Management
Chanin Teparut,Suthipong Sthiannopkao 한국자원공학회 2011 Geosystem engineering Vol.14 No.2
Mae Moh Lignite Mine, in northern Thailand, is the largest open-pit lignite mine in Southeast Asia. It is designed to produce some 16 million tons of lignite per year, to meet the 2400 MW requirements of Mae Moh’s mine-mouth thermal power plants. The mine operation causes both direct and indirect environmental impacts on land use, quality of life,forests and wildlife; it has also caused pollution in such forms as dust, noise, water contamination, odors from the spontaneous combustion of lignite and vibration from blasting. Recognized as a significant pollution source, regulations based on environmental impact assessments (EIA) have been stringently applied. The mine’s controlling body has undertaken responsibility for management of all impacts through its Mae Moh Mine Master Plan, an ambitious outline for further development of the lignite resources in Mae Moh Basin. Standard management by ISO 14001, ISO9001, TIS18001 and CSR guidelines is at present under implementation. The transparency of the system has served to increase trust in Mae Moh Mine’s environmental management, while contributing to an awareness of the environmental impacts and the continual efforts to mitigate them.
Chanin KHOMLAEM,Hajer ALOUI,Beom Soo KIM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
A cell retention culture of Paracoccus sp. LL1 was performed in a membrane fermenter equipped with an internal ceramic filter module to reach high cell density and thus enhance the co-production of polyhydroxyalkanoate (PHA) and astaxanthin as growth associated products. This study showed that PHA accumulation increased with increasing dry cell weight (DCW) giving rise to a maximum of 43.87 ± 0.91 g/L (38.76% of DCW) at 48 h. A significant increase in both intra and extracellular astaxanthin concentrations was also recorded during the fermentation process achieving a maximum production of respectively 8.51 ± 0.20 and 10.2 ± 0.24 ㎎/L at 48 h. Based on gas chromatography, Fourier transform infrared spectroscopy, and ¹H nuclear magnetic resonance spectroscopy, the extracted PHA was identified as a copolymer of 3HB/3HV with a 3-hydroxyvalerate (3HV) content of 3.78 ㏖%. The thermal stability of the produced PHA was comparable to that of standard poly-3-hydroxybutyrate (PHB) and higher than that of standard poly-3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV) with 12 ㏖% 3HV.
Pharmacophore Identification for Peroxisome Proliferator-Activated Receptor Gamma Agonists
손영식,이윤호,Chanin Park,Swan Hwang,Songmi Kim,Ayoung Baek,Minky Son,서정근,Hyong-Ha Kim,이근우 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.1
Peroxisome proliferator-activated receptors (PPARs) are members of nuclear receptors and their activation induces regulation of fatty acid storage and glucose metabolism. Therefore, the PPARγ is a major target for the treatment of type 2 diabetes mellitus. In order to generate pharmacophore model, 1080 known agonists database was constructed and a training set was selected. The Hypo7, selected from 10 hypotheses, contains four features: three hydrogen-bond acceptors (HBA) and one general hydrophobic (HY). This pharmacophore model was validated by using 862 test set compounds with a correlation coefficient of 0.903 between actual and estimated activity. Secondly, CatScramble method was used to verify the model. Hence, the validated Hypo7 was utilized for searching new lead compounds over 238,819 and 54,620 chemical structures in NCI and Maybridge database, respectively. Then the leads were selected by screening based on the pharmacophore model, predictive activity, and Lipinski’s rules. Candidates were obtained and subsequently the binding affinities to PPARγ were investigated by the molecular docking simulations. Finally the best two compounds were presented and would be useful to treat type 2 diabetes.
Robbie Weterings,Chanin Umponstira,Hannah Linda Buckley 한국응용곤충학회 2015 Journal of Asia-Pacific Entomology Vol.18 No.1
In Thailand, several important diseases are transmitted by mosquitoes. Many vector control programs focus on the reduction of these medically important mosquitoes through the application of pesticides, bed-nets and the introduction of biological control agents. Odonates naiads are important, naturally occurring predators of vector mosquitoes. To estimate the predation rates of odonate species in Thailand, we conducted an experiment in which the predation rateswere compared across a range of predator and prey densities.We used seven different predator species from different instars that represented the composition of naiads in our study area. Body sizes ranged between 2.6 mm and 15.9 mm. Two different prey species were used, larvae of the mosquito Armigeres moultoni Edwards, 1914 and Aedes aegypti L. 1762. Predation rates showed a positive non-linear relationship with prey densities and a negative non-linear relationship with predator densities. The mean ± SE predation rates per predator were 6.2 ± 0.8 individuals per 24 h for dragonfly naiads and 5.1 ± 0.7 for damselfly naiads. Predation rates were very low compared to previously recorded rates. However, unlike previous research, we did not focus on single species in a late stage of development but on multiple species in all stages that resembled the natural odonata community composition.
Input/output linearization with a two-degree-of-freedom scheme for uncertain nonlinear processes
Pisit Sukkarnkha,Chanin Panjapornpon 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.6
This work presents a new method to control processes with unmeasured input disturbance and random noise parametric uncertainty. The developed method takes advantage of a two-degree-of-freedom control structure in which setpoint regulation and load disturbance rejection are integrated in the controller synthesis. Input/output linearization is selected to provide the setpoint tracking ability. For disturbance rejection, the high-gain technique is used to compensate for the effect of the uncertainty. The control performance of the method is evaluated through numerical simulation of continuous stirred tank reactors with uncertainty. The simulation results show that both unmeasured disturbance and parametric uncertainty can be effectively compensated for by the proposed control method.
A Novel Clamp-Mode Coupled-Inductor Boost Converter with High Step-Up Voltage Gain
Kaweewat Tattiwong,Chanin Bunlaksananusorn 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.2
In this paper, a new coupled inductor DC-DC converter with a high step-up voltage gain is proposed. It is developed from a clamp-mode coupled-inductor boost converter by incorporating an additional capacitor and diode. The proposed converter is able to achieve the higher voltage gain, while still retaining the switch voltage clamp property of its predecessor. In the paper, operation and analysis of the proposed converter are described. Experimental results from a prototype converter are presented to verify the validity of the analysis. The prototype circuit attains the highest efficiency of 92.8%.