• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 추계학술대회 논문집 학회본부 A
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• pp.40-42
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• 1999

In this paper, light-weight system of linear induction motor(LIM) for light railway train is presented, and is compared with former type of LIM. For the light-weight system without modification of motor size the material of primary core(silicon steel) is changed with iron-cobalt alloy and the material of primary winding(copper) is changed with aluminium. The characteristics of LIM are analyzed. Specially, the air gap magnetic flux density distribution due to end effect is showed with motor velocity, we will present papers continuously through designing and testing a trial product.

• Biotechnology and Bioprocess Engineering:BBE
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• 제11권5호
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• pp.414-419
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• 2006

When the alginate lyase gene (aly) from Pseudoalteromonas elyakovii was expressed in E. coli, most of the gene product was organized as aggregated insoluble particles known as inclusion bodies. To examine the effects of chaperones on soluble and nonaggregated form of alginate lyase in E. coli, we constructed plasm ids designed to permit the coexpression of aly and the DnaK/DnaJ/GrpE or GroEL/ES chaperones. The results indicate that coexpression of aly with the DnaK/DnaJ/GrpE chaperone together had a marked effect on the yield alginate lyase as a soluble and active form of the enzyme. It is speculated this result occurs through facilitation of the correct folding of the protein. The optimal concentration of L-arabinose required for the induction of the DnaK/DnaJ/GrpE chaperone was found to be 0.05mg/mL. An analysis of the protein bands on SDS-PAGE gel indicated that at least 37% of total alginate lyase was produced in the soluble fraction when the DnaK/DnaJ/GrpE chaperone was coexpressed.

• Natural Product Sciences
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• 제26권1호
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• pp.97-107
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• 2020

Isolation of oils from leaves of Juniperus phoenicea and Juniperus oxycedrus was obtained by steam distillation extraction method. The compositions of essential oils (EOs) were studied by means of GC-MS and GC-FID, using the internal standard method and relative response factors. Around ninety eight compounds were determined in total, representing 98.25 g/100 g of EO of J. phoenicea and 98.48 g/100 g of EO of J. oxycedrus, respectively. The volatile leaf oils were dominated by the terpenic hydrocarbon fractions (79.87 g/100 g) and (61.27 g/100 g) characterized by high contents of α-pinene (64.6 g/100 g) and (54.0 g/100 g) in J. phoenicea and J. oxycedrus, respectively, as the main component. Also, the enantiomeric distribution of α-pinene, sabinene, camphene, δ-3-carene, β-pinene, limonene, linalool, terpinen-4-ol, bornyl acetate, and borneol in both oils is presented for the first time.

• 소성∙가공
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• 제16권1호
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• pp.61-66
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• 2007

Powder injection molding(PIM) is widely used for many parts in the field of automotives, electronics and medical industries, due to the capability of net shaping for complex 3-D geometry. Powder injection mold design for the dental scaler tip, a component of medical appliance, was presented. In comparison with conventional machining process, powder injection molding has many advantages, specially in price and dimensional stability, for molding dental scaler tip which has complex geometry. Both product design and mold design for dental scaler tip were presented. A PIM feedstock was made of stainless series(17-4PH, 316L, 440C) powder and a wax based binder. The 'rapid mold' concept was applied to manufacture the various forms and materials of dental scaler tip including vibration characteristics.

• 대한화장품학회:학술대회논문집
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• 대한화장품학회 2003년도 IFSCC Conference Proceeding Book II
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• pp.417-423
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• 2003

The use of both an Alpha Hydroxy Acid, Citric Acid, and a Skin Moisturizer, Glycereth-26, formulated into a hand dishwashing detergent have been shown to be synergistic in their effects on certain skin health parameters. Each ingredient was evaluated alone and together in a hand dishwashing detergent via a 9-week use test. Panelists washed dishes using the sponge method commonly used in Asian markets and a 1:7 dilution of the concentrated dish detergent. Panelist's hands were evaluated initially and at 3-week intervals for nine weeks. After nine weeks panelist's hands showed significant improvements in Moisture Absorption and Transepidermal Water Loss (TEWL). A synergistic effect on TEWL was found between the AHA and the Moisturizer. These effects, showing an improvement in the condition of the panelist's skin are impressive, particularly since they were observed from a dishwashing product that is highly diluted and at near neutral pH during the washing process.

• Natural Product Sciences
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• 제1권1호
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• pp.31-42
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• 1995

One hundred plants in 43 families used in Malaysian traditional medicine were screened for tumour promoting activity using two methods, the technique of activation of latent Epstein-Barr Virus (EBV) in Raji cells and the irritation test on mouse ear. Extracts of only eight plants belonging to the Euphorbiaceae were found to possess EBV activation factor and to give a positive irritation test in mouse ear. These plants included Euphorbia tirucalli L., E. splendes, Jatropha podagrica, J. gossypyfolia L., Pedilanihus tithymaloides (L.) Poitt., Croton argyratus Bl., Exocoecaria agallocha L. and Codiaeum variegatum (L.) Bl. Seven of these plants are used internally in Malaysian traditional medicine. As such, they pose potential danger in the promotion of initiated cells of the mucosal tissue towards disease. Further studies are required to assess the epidemiological impact of these plants in the development of disease.

• International Journal of Naval Architecture and Ocean Engineering
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• 제11권1호
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• pp.462-473
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• 2019

The effects of the location and dimension of the gate, location, and volume of the feeder, application of a chill, chill volume, and heating method of the feeder with respect to the effect of the mold-designing technologies on the defect status of the products are described. It is possible to increase the solidification time of the feeder by heating feeder. Furthermore, the pressure generated from the feeder is imposed on a product, and this decreases the generation of shrinkage porosities. In this study, two types of gating and feeding systems had been proposed: the bottom L-type junctions and the top L-type junctions. Additionally, solidification behaviors, such as solidification time, shrinkage porosities, weight percentage of chill system to product, hot spot, and solidification time ratio (=Solidification time of feeder/solidification time of product), are extensively analyzed by using commercial casting simulation software. Based on the solidification behaviors, reasonable mold design, feeding system, critical feeder heating temperature, and solidification time ratios are proposed in the sand casting process for the fabrication of carrier housing in order to reduce the casting defects and to increase the recovery rate.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2000년도 International Symposium on Magnetics The 2000 Fall Conference
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• pp.5-32
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• 2000

MRAM, High performance MRAM using MTJS demostrated, fully integrated MTJ MRAM with CMOS circuits, write time ~2.3 nsec; read time ~3 nsec, Thermally stable up to ~350 C, Switching field distibution controlled by size & shape. Magnetic Tunnel Junction Properties, Magnetoresistance: ~50% at room temperature, enhanced by thermal treatment, Negative and Positive MR by interface modification, Spin Polarization: >55% at 0.25K, Insensitive ot FM composition, Resistance $\times$ Area product, ranging from ~20 to 10$^{9}$ $\Omega$(${\mu}{\textrm}{m}$)$^{2}$, Spin valve transistor, Tunnel injected spin polarization for "hot" electrons, Decrease of MTJMR at high bias originates from anode.

• 한국미생물·생명공학회지
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• 제13권3호
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• pp.245-250
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• 1985

효모의 구연산 생산성을 향상시키기 위하여 구연산 생성이 향상된 변이균주를 분리.사용하여 비교적 높은 당농도에서의 구연산발효 및 균체 순환식 반연속배양에 의한 구연산발효 실험을 실시하였다. 친균주인 Candida lipolytica S-109를 NTG처리하여 친주균에 비하여 구연산생성능이 30%정도 향상되고 fumarate, malate, isocitrate 생성이 억제된 변이균주 J-24를 분리하였다. 친균주 S-109와 변이균주 J-24를 10% glucose 함유 배지에서 6일간 배양하여 각각 56g/l, 72g/l의 구연산을 생성하였다. 배양액내의 구연산축적량을 향상시키기 위한 비교적 높은 glucose농도는 16%였으며 85g/l의 구연산을 생성하여 53% 수율을 보였다. P/C비, urea 및 yeast extract 농도를 각각 0.8-1.0 $\times$ $10^{-3}$, 0.15%, 0.25%로 할 때 93g/l의 구연산을 축적하여 58% 수율로 향상되었다. 효율적인 생산기를 연장하고 생산물 저해를 억제하며 유도기를 단축하기 위하여 균체순환식 반연속배양을 실시한 결과 그 생산성이 0.79g/l.h로서 회분식의 053g/l.h에 비하여 1.5배 높았다.

• KSBB Journal
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• 제17권3호
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• pp.290-294
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• 2002

경제적으로 에리스리톨을 대량 생산하기 위해 Moniliella suaveolens var. nigra의 wild type을 mutation시켜 변이주를 선별하였다. 선별된 변이주는 400 g/L 포도당배지 플라스크 배양에서 에리스리톨 172 g/L, 글리세롤 20 g/L를 생산하였는데 wild-type의 배양결과와 비교하면 에리스리롤의 생산성은 비슷하고 부산물인 글리세롤의 생성은 50% 적다. 변이주는 wild type 배양시 발생하는 다량의 foam을 적게 발생시킴이 관찰되었다. 배양기 5 L 배양에서 변이주는 에리스리톨의 생산과 부산물 글리세롤의 생성이 wild-type의 것들과 비슷하였다. 이의 원인은 아직 규명되지 않았으나 배양 중 부적절한 산소전달이나 배양 중 발생하는 거품에 세포가 응집하였기 때문인 것으로 추측된다. 균주의 대사를 조사한 결과, 글리세롤은 에리스리톨로 변환되나 에리스리톨은 글리세롤로 변환되지 않음이 관찰되었다. 새로운 고생산성 Moniliella 변이주는 분리.정제 비용이 절감된 순도 놀은 에리스리톨 생성을 가능 하게 할 것이다.