• Journal of the Korean Applied Science and Technology
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• v.25 no.3
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• pp.299-312
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• 2008

The fat of Tra and Basa catfish (Mekong Delta, Viet Nam) was evaluated for the first time as the potential feedstock for biodiesel production, due to its abundance, availability and cheap cost. The unsaturated fatty acid contents of Tra and Basa fat were 57.97% and 64.17%, respectively. Biodiesel was prepared from Tra and Basa fat by methanolysis reaction using alkali catalysts like sodium hydroxide and potassium hydroxide. Effects of various process parameters on biodiesel production, such as molar ratio of methanol to fat, catalyst concentration, temperature and time were investigated. As those results, the transesterification can be performed under moderate conditions, and the biodiesel yields were shown more than 90%. KOH catalyst was the best catalyst for biodiesel production from both Basa and Tra fat. As the feedstock aspect, Basa fat was indicated more efficiency than that of Tra fat. The maximum yield could be achieved by the transesterification from Basa fat with 5:1 molar ratio of methanol to fat, 0.8% KOH catalyst, $50^{\circ}C$, and 50 min. For Tra fat, the optimal condition were at 6:1 molar ratio of methanol to fat, 0.8% KOH catalyst, $50^{\circ}C$, and 45 min. Nowadays, due to cheaper cost and abundance, Tra fat is a promised resource for cheap biodiesel production in Viet Nam.

• Asian-Australasian Journal of Animal Sciences
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• v.18 no.5
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• pp.671-676
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• 2005

A total of 50 individual catfish, the Tra (Pangasius hypophthalmus) cultivated in either floating cages (Tra-c) or in ponds (Tra-p) and the Basa (Pangasius bocourti) raised in three floating cages, were collected in two of the Mekong Delta provinces. The caudal fin of each individual fish was used for protein electrophoresis employing the SDS-PAGE method. The one fillet sides were used as a representative sample to determine the dry matter (DM), crude protein (CP), ether extract (EE) and amino acids (AAs). The catfish oil was extracted from the belly fats, and the fatty acid (FA) composition was analyzed. There were 21 bands of the Tra and the Basa. Protein bands of the two varieties were 28.6-33.3% polymorphic, while polymorphic individuals of the Tra ranged from 80.0 to 100.0%, and the Basa was 90.0% polymorphic. The phenotypic diversity (Ho) of the Tra ranged from 1.71 to 1.80, while the Basa ranged as high as 2.14%. Diversity values (H$_{EP}$) for genetic diversity markers were equal in the Tra and the Basa. The sum of the effective number of alleles (SENA) of both varieties ranged from 3.40 to 3.83 for the Basa and the Tra, respectively. The lower values of Ho and SENA, as compared with those of the fresh water prawn (Macrobrachium equidens) in the area, would suggest that the species with the low values will become extinct due to inbreeding; the gene pools of each observed population were below a suitable threshold. Many of the differences in the nutritional values of the Tra-c, the Tra-p and the Basa were measured; their nutrient values were comparable to fishmeal or fish oil. Most of the DM, CP, and EE were higher in the Tra, especially in the Tra-c. The essential AA content, especially that of lysine, was highest in the Tra-c, next highest in the Tra-p, and lowest in the Basa. Therefore, the amino acid patterns were closer to the ideal patterns in the same sequences. In contrast, the essential FAs were concentrated in the Basa fish oil. It was found that suitable selection of parents for seed production is required to avoid inbreeding. Catfish may be valuable sources of nutrition for both humans and animals, and the differences in their nutritional values by variety and/or management must be taken into account.

• Proceedings of the Korea Contents Association Conference
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• 2008.05a
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• pp.324-327
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• 2008

This research seeks to investigate the economic feasibility of a small size aircraft development and BASA certification enterprise. To achieve the objective, this research investigates cost which requires for proceeding a small size aircraft development and BASA certification enterprise. This research also investigates the economic effects and economic benefits acquired from exporting civil aircraft. Costs and benefits are assumed using cash flow by types of airplanes. On the basis of the cash flow, this research calculates B/C ratio, NPV, IRR for investigating the economic feasibility. The result shows that there are economic feasibility for both very light jet and piston aircraft. Between these two aircraft types, more economic feasibility exist for very light jet than piston aircraft.

• Aerospace Industry
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• v.85
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• pp.4-9
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• 2004

• Aerospace Industry
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• v.78
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• pp.6-10
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• 2002

• The Journal of Korean Academy of Sensory Integration
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• v.19 no.2
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• pp.26-35
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• 2021

Objective : The purpose of this study is to investigate the effect of Interactive Metronome (IM) training on the reading fluency of an elementary school student. Methods : This study followed the ABA design, a single-case research method, and was conducted on one elementary school student. From October 2019 to December 2019, a three-session baseline phase (A), twelve-session intervention phase (B), and three-session post-baseline phase (A') were conducted. The intervention was IM training, and long-form assessment (LFA) of IM and BASA:R were performed for each session. In addition, BASA:R was conducted three times at baseline and post-baseline. Result : Compared with baseline, there was a significant improvement in reading fluency after the IM training intervention. Conclusions : IM training can be useful for increasing reading fluency. The results of this work demonstrate the efficacy of IM training as a clinical intervention to improve reading fluency in elementary school students.

• The Journal of Korean Academy of Sensory Integration
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• v.20 no.1
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• pp.14-25
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• 2022

Objective : The purpose of this study was to investigate the effect of brain-timing training using an Interactive Metronome (IM) on the reading abilities of children with low brain-timing abilities. Methods : A single-group pretest and posttest (retrospective study) were conducted in 8 children whose timing abilities were lower than that for their age average and who were trained from 2019 to 2021. Brain-timing training was conducted 2 or 3 times per week, with 70 sessions in total and 40-50 minutes per session, depending on the developmental characteristics of the child. Changes in brain-timing ability before and after the training were measured using the IM Long-Form Assessment (LFA), and reading ability was measured using the Basic Academic Skills Assessment:Reading (BASA:R). Results : On the basis of the results of the brain-timing ability evaluation using the LFA, the reaction times of all the children during motor tasks were decreased, resulting in statistically significant improvements in their brain-timing abilities (p < .05). Moreover, the raw scores in the BASA:R reading and fill-in-the-blank tests were significantly improved (p < .05). Conclusion : This study is meaningful in that it presents a clinical basis for brain-timing training to improve the reading abilities of children.

• Aerospace Industry
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• s.105
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• pp.8-11
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• 2009

• Current Industrial and Technological Trends in Aerospace
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• v.8 no.2
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• pp.124-135
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• 2010

The Japanese and U.S. governments has signed a Bilateral Aviation Safety Agrement and associated implementation procedures for airworthiness on April 27, 2009 to mutually accept the airworthiness approvals for aircraft and parts that the other country issue. This bilateral agreements do not relieve the Civil Aviation Authority(CAA) of its statutory responsibilities for certification. However, they provide an alternative means for the CAA to make its findings, recognizing the competency of another authority to conduct certification functions in a manner comparable to, and on behalf of, the CAA. In this way, the bilateral agreements contribute to ensuring aviation safety as well as reducing the burden imposed on the aviation industries without compromising safety. This paper is to discuss recent status of Bilateral Aviation Safety Agreement and associated Japanese Aircraft Certification System.

• Proceedings of the Korea Contents Association Conference
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• 2007.11a
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• pp.769-772
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• 2007

This research was conducted to investigate the economoic effects of aviation safety technology development. The important subjects of aviation safety technology development, aviation accident prevention and damage reduction technique, aircraft safety certification development, BASA promotion in an aircraft class, were included to investigate the economic effects. The survey technique using Benefit-Cost Anlysis was performed and the results showed that aviation safety technology development brought scientific technique effect, industrial and economic effect, and the rest effects. Also, the benefits from aviation safety technology development were much greater than the costs.