• 제목/요약/키워드: Combination products

검색결과 773건 처리시간 0.024초

탄소나노튜브 면상발열체의 선박 기자재 적용 연구 (Application of a CNT Surface Heating Element to the Ship Equipment)

  • 배상은;이운식
    • 한국산업융합학회 논문집
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    • 제22권6호
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    • pp.673-680
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    • 2019
  • This study investigates the validity of applying new carbon nanotube (CNT, Carbon Nano Tube) surface heaters, which are applied in combination with various products, to the vessel's materials, and proposes the commercializable products accordingly. In order to actually apply a CNT surface heating system technology to the ship's equipment for the first time in Korea, we carried out the interview of experts in the technology field and the due diligence of the shipyard, and presented the technology road map for the selected three items. Finally, for "Heating System of Ship Fuel Tank" with the highest commercialization potential, we proposed a conceptual diagram to enable the final development of the product through the product analysis.

Employing high-temperature gas flux in a residual salt separation technique for pyroprocessing

  • Kim, Sung-Wook;Heo, Dong Hyeon;Kang, Hyun Woo;Hong, Sun-Seok;Lee, Sang-Kwon;Jeon, Min Ku;Hur, Jin-Mok;Choi, Eun-Young
    • Nuclear Engineering and Technology
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    • 제51권7호
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    • pp.1866-1870
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    • 2019
  • Residual salt separation is an essential step in pyroprocessing because its reaction products, as prepared by electrochemical unit processes, contain frozen residual electrolyte species, which are generally composed of alkali-metal chloride salts (e.g., LiCl, KCl). In this study, a simple technique that utilizes high-temperature gas flux as a driving force to melt and push out the residual salt in the reaction products was developed. This technique is simple as it only requires the use of a heating gun in combination with a gas injection system. Consequently, $LiNO_3-ZrO_2$ and $LiCl-ZrO_2$ mixtures were successfully separated by the high-temperature gas injection (separation efficiency > 93%), thereby demonstrating the viability of this simple technique for residual salt separation.

회수수 슬러지 고형분을 주재료로 한 자원순환형 시멘트 2차 제품 생산의 기초적 특성 평가 (Basic Characterization of Resource-recycling Secondary Products of Cement by Using Sludge Solids as The Main Material)

  • 김민성;홍성준;김영진;류동우
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2021년도 가을 학술논문 발표대회
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    • pp.118-119
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    • 2021
  • In this study, we confirmed the basic characteristics of paste and mortar 1:1, 1:2, 1:3 composition using concrete sludge solid content for the purpose of developing a resource-recycling cement secondary products. The 1:2 mortar formulation showed the best compressive strength. The steam curing strength is superior in the order of C20, BS40, BS20 and Control. it is judged that the FA combination is not suitable.

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Industrial Research and Development on the Production Process and Quality of Cultured Meat Hold Significant Value: A Review

  • Kyu-Min Kang;Dong Bae Lee;Hack-Youn Kim
    • 한국축산식품학회지
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    • 제44권3호
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    • pp.499-514
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    • 2024
  • Cultured meat has been gaining popularity as a solution to the increasing problem of food insecurity. Although research on cultured meat started later compared to other alternative meats, the industry is growing rapidly every year, with developed products evaluated as being most similar to conventional meat. Studies on cultured meat production techniques, such as culturing new animal cells and developing medium sera and scaffolds, are being conducted intensively and diversely. However, active in-depth research on the quality characteristics of cultured meat, including studies on the sensory and storage properties that directly influence consumer preferences, is still lacking. Additionally, studies on the combination or ratio of fat cells to muscle cells and on the improvement of microbiota, protein degradation, and fatty acid degradation remain to be conducted. By actively investigating these research topics, we aim to verify the quality and safety of cultured meats, ultimately improving the consumer preference for cultured meat products.

A SIMPLE METHOD FOR OBTAINING PROJECTION MATRIX USING ALGEBRAIC PROPERTIES

  • Hasik, Sun-Woo
    • Journal of applied mathematics & informatics
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    • 제8권2호
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    • pp.651-658
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    • 2001
  • The projection matrix plays an important role in the linear model theory. In this paper we derive an algebraic relationship between the projection matrices of submatrices of the design matrix. Using this relationship we can easily obtain the projection matrices of any submatrices of the design matrix. Also we show that every projection matrix can be obtained as a linear combination of Kronecker products of identity matrices and matrices with all elements equal to 1.

Control of Tylosin Biosynthesis in Streptomyces fradiae

  • Cundliffe, Eric
    • Journal of Microbiology and Biotechnology
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    • 제18권9호
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    • pp.1485-1491
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    • 2008
  • Tylosin biosynthesis is controlled in cascade fashion by multiple transcriptional regulators, acting positively or negatively, in conjunction with a signalling ligand that acts as a classical inducer. The roles of regulatory gene products have been characterized by a combination of gene expression analysis and fermentation studies, using engineered strains of S. fradiae in which specific genes were inactivated or overexpressed. Among various novel features of the regulatory model, involvement of the signalling ligand is not essential for tylosin biosynthesis.

Screening and Isolation of Antibiotic Resistance Inhibitors from Herb Materials-Resistance Inhibition of Volatile Components of Korean Aromatic Herbs

  • Lee, Chung-Kyu;Kim, Hye-Kyung;Moon, Kyung-Ho;Shin, Kuk-Hyun
    • Archives of Pharmacal Research
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    • 제21권1호
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    • pp.62-66
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    • 1998
  • The resistance inhibitory activities of 54 odorant mixtures (essential oil) from 41 Korean aromatic herbs were tested against multi-drug resistant Staphylococcus aureus SA2, which has resistances to 10 usual antibiotics including chloramphenicol. As results, combinations of 28 kinds of samples from 21 herbs and chloramphenicol have resistance inhibitory activities in dose dependent manner.

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바탕콘크리트 내구성 향상을 위한 산업폐기물 활용에 관한 연구 (A Study on the Utilization of Industrial Waste to Improve the Durability of Base Concrete)

  • 김대건
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2022년도 봄 학술논문 발표대회
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    • pp.107-108
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    • 2022
  • This study aims to solve environmental problems by reducing complex degradation and recycling industrial waste by utilizing waste fibers and blast furnace slags, which are industrial by-products. In addition, it is intended to secure long-term durability to reduce cracks. To this end, the disadvantages of fiber-reinforced concrete are to solve the problem of lowering liquidity and ensuring curing time, and to find the optimal combination when waste fibers and blast furnace slag are used together.

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발사체 추진제로서 과산화수소의 과거와 미래전망 (The Past and Future Perspectives of Hydrogen Peroxide as Rocket Propellants)

  • 하성업;권민찬;서견수;한상엽
    • 한국항공우주학회지
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    • 제37권7호
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    • pp.717-728
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    • 2009
  • 로켓추진기관에 있어 과산화수소는 단일추진제와 이종추진제의 산화제로 사용되어 왔다. 과산화수소는 추력기용으로 사용된 최초의 단일추진제였으나, 후에 보다 비추력이 높고 저장성이 좋은 하이드라진으로 대체되었고, 터보펌프 구동용으로는 여전히 사용되어지고 있다. 이종추진제의 산화제로서는 1970년대까지 사용되었다. 1990년대에 들어서 저비용, 친환경적인 개발이 중요하게 대두되면서 과산화수소는 다시 개발자들의 관심의 대상이 되었다. 과산화수소의 저장성능이 과거에 비해 크게 개선되었으며, 케로신/과산화수소를 추진제 조합으로 사용하는 경우 케로신/액체산소를 사용하는 경우에 비하여 가속성능은 다소 떨어지나, 높은 추진제밀도와 O/F 비로 인하여 유사한 가속성능을 얻을 수 있으며, 연소생성물 역시 더욱 청정하였다.

Effect of Catechins, Green tea Extract and Methylxanthines in Combination with Gentamicin Against Staphylococcus aureus and Pseudomonas aeruginosa - Combination therapy against resistant bacteria -

  • Bazzaz, Bibi Sedigheh Fazly;Sarabandi, Sahar;Khameneh, Bahman;Hosseinzadeh, Hossein
    • 대한약침학회지
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    • 제19권4호
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    • pp.312-318
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    • 2016
  • Objectives: Bacterial resistant infections have become a global health challenge and threaten the society's health. Thus, an urgent need exists to find ways to combat resistant pathogens. One promising approach to overcoming bacterial resistance is the use of herbal products. Green tea catechins, the major green tea polyphenols, show antimicrobial activity against resistant pathogens. The present study aimed to investigate the effect of catechins, green tea extract, and methylxanthines in combination with gentamicin against standard and clinical isolates of Staphylococcus aureus (S. aureus) and the standard strain of Pseudomonas aeruginosa (P. aeruginosa). Methods: The minimum inhibitory concentration (MIC) and the minimum bactericidal concentration (MBC) values of different agents against bacterial strains were determined. The interactions of green tea extract, epigallate catechin, epigallocatechin gallate, two types of methylxanthine, caffeine, and theophylline with gentamicin were studied in vitro by using a checkerboard method and calculating the fraction inhibitory concentration index (FICI). Results: The MICs of gentamicin against bacterial strains were in the range of $0.312-320{\mu}g/mL$. The MIC values of both types of catechins were $62.5-250{\mu}g/mL$. Green tea extract showed insufficient antibacterial activity when used alone. Methylxanthines had no intrinsic inhibitory activity against any of the bacterial strains tested. When green tea extract and catechins were combined with gentamicin, the MIC values of gentamicin against the standard strains and a clinical isolate were reduced, and synergistic activities were observed (FICI < 1). A combination of caffeine with gentamicin did not alter the MIC values of gentamicin. Conclusion: The results of the present study revealed that green tea extract and catechins potentiated the antimicrobial action of gentamicin against some clinical isolates of S. aureus and standard P. aeruginosa strains. Therefore, combinations of gentamicin with these natural compounds might be a promising approach to combat microbial resistance.