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  • Title/Summary/Keyword: 유도 경화

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A Study on the Buoy type Oil Guiding System for the Active Circulation type Oil Recovery Vessel (자연순환식 유회수선박에서의 부유식 기름유도장치에 관한 연구)

  • 이귀주;김경화
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2001.10a
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    • pp.185-189
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    • 2001
  • A study on the new active circulation type oil-water separation system including buoyancy type guidance system was carried out in this paper. Oil-water separation system is composed of several oil separation steps. Buoy type oil guiding system was developed based on the difference of buoyance of water and oil. The design speed of this vessel is 25 knots.

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Studies on the Physicochemical Properties of Natureal and Imitation Nuts (천연 및 인조 Nuts의 이화학적 조성 비교)

  • 김재남;조대희;김영만
    • The Korean Journal of Food And Nutrition
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    • v.13 no.3
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    • pp.235-241
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    • 2000
  • 화학적 성분 중 가장 많은 함량을 차지하고 있는지질에서는 조지질과 유리지질 함량이 imitation nut가 각각 58.7%, 45.9%로 네 종류의 천연 nut 류 중 ha-zelnut을 제외하곤 더 높았으나 부분 경화 대두유를 원료로 사용하여 결합지질의 양이 천연 nut류에 비해 적게 나타났고, 극성지질인 당지질과 인지질의 함량도 역시 낮게 나타났다. 또한 유지의 불포화도를 알 수 있는 요오드가도 산화 안정성이 우수한 imitation nut가 천연 nut류에 비해 낮은 값을 보이고 있다. 지방산 조성에서는 천연 nut류 중 peanut에서만 arachidic acid, eicsenoic acid, behenic acid, ligno-ceric acid를 분석할 수 있었고, imitation nut류 역시 대두유에서 특징적으로 나타나는 linolenic acid를 검출 할수 있었다. 아미노산 조성의 경우 천연 nut류와 imitation nut모두에서 glutamic acid의 함량이 가장 높게 나타났으며, 필수 아미노산의 함량은 imitation nut가 천연 nut류보다 약간 높은 것으로 나타났다.

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A study on Heat Flux of Induction Heating of steel plate using the Taguchi Method (다구찌법을 이용한 유도가열 강판의 입열량에 관한 연구)

  • 이윤창;장상균;양영수
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.10a
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    • pp.671-674
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    • 2002
  • Induction heating is a process with magnetic and thermal situation. Induction heating of flat metal products has an increasing importance in many applications, because it generates the heat within workpiece itself and provides high power densities and productivity. When the high frequency electric current flows in a coil, the process parameters which are air gap, power density, and heating time have a important roles on induction heating of steel plate. This study investigates an influence of the process parameters by means of experiments using Taguchi method.

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참서대 (Cynoglossus joyneri) 암컷의 생식생태

  • 마경화;김성연;이정식
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • 2000.05a
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    • pp.472-473
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    • 2000
  • 수산동물의 생식기구에 관한 연구는 우선 자연상태에서 각 종의 정확한 생식주기와 이를 지배하는 요인이 밝혀져야 하는데, 이는 자원증식을 위한 기본적인 연구과제이기도 하다. 참서대는 가자미 목, 참서대과에 속하는 경골어류이며, 한국 남서해안의 수심 70 m 이내의 연안이나 내만에 주로 서식하는 경제성이 높은 저서 정착성 어류이다. Genus Cynoglossus의 생식과 관련된 연구는 매우 적어서 용서대, Cynoglossus abbreviatus의 난소성숙의 유도 및 초기생활사 (Fujita et al., 1986)와 참서대, C. joyneri의 성장과 성숙에 관한 보고 (Choi et al., 1995)가 있을 뿐이다. 따라서 본 연구의 목적은 참서대 암컷 GSI의 월 변화, 포란수, 생식주기 및 생식주기에 따른 난소구조의 변화 등 생식생태를 조사하여 이들 어류의 자원증식을 위한 기초자료를 제공하기 위함이다. (중략)

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Thermally Curable Organic-inorganic Hybrid Coatings on Ophthalmic Lenses by the Sol-Gel Method (졸-겔법에 의한 안경렌즈의 열경화형 유-무기 하이브리드 코팅)

  • Yu, Dong-Sik;Lee, Ji-Ho;Do, Young-Woong;Park, Seong-Ae;Ha, Jin-Wook
    • Proceedings of the KAIS Fall Conference
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    • 2006.05a
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    • pp.587-592
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    • 2006
  • 코팅은 플라스틱의 표면의 물성과 렌즈의 광학적 성능을 높이기 위해 필요하다. Allyl diglycol carbonate계열 렌즈 표면의 물성과 광학적 성능을 개선하기 위하여 3-glycidoxypropyltrimethoxysilane(GPTS), methyltrimethoxysilane(MTMS) 및 tetraethyl orthosilicate(TEOS)의 몰 비를 변화시켜 유-무기 하이브리드 재료로 사용하였다. Sol-gel 공정에 의한 flow코팅하여, 140C에서 4시간 경화하였다. 코팅 렌즈는 투과율, 부착력, 연필경도, 내마모성, 내온수성 및 내약품성을 평가하였고 GPTS, MTMS 및 TEOS의 몰비가 각각 1: 1: 2일 때 가장 우수한 것으로 나타났다.

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Inverter for Induction Heating using Simultaneous Dual-Frequency Method (동시 이중주파수 구동을 이용한 유도가열용 인버터)

  • Shin, Woo-Seok;Park, Hee-Chang
    • The Transactions of the Korean Institute of Power Electronics
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    • v.16 no.6
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    • pp.554-560
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    • 2011
  • Single-frequency induction heating equipment caused by a hardening heat treatment process of the double investment in the issue and allow the heat treatment process in order to shorten the time from one process to work simultaneously on two kinds of processes that allow Simultaneous Dual Frequency(SDF) drive scheme technology are described. In this paper, we propose a dual way to drive a simultaneous dual-frequency drive scheme has been implemented. Through simulations and experiments, we can obtain the validity of the proposed inverter for dual-frequency control and power control.

Antistatic Behavior of UV-curable Multilayer Coating Containing Organic and Inorganic Conducting Materials (유·무기 전도성 물질을 함유한 UV 경화형 다층 코팅의 대전방지 특성)

  • Kim, Hwa-Suk;Kim, Hyun-Kyoung;Kim, Yang-Bae;Hong, Jin-Who
    • Journal of Adhesion and Interface
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    • v.3 no.3
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    • pp.22-29
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    • 2002
  • UV curable coating system described here consists of double layers, namely under layer and top laser coatings. The former consists of organic-inorganic conductive materials and the latter consists of multifunctional acrylates. Transparent double layer coatings were prepared on the transparent substrates i.e. PMMA, PC, PET etc. by the wet and wet coating procedure. Their surface resistances and film properties were measured as a function of the top layer thickness and relative humidity. As the thickness of the top layer was less than 10μm, the surface resistance in the range of 1081010Ω/cm2 was obtained. The surface properties of the two-layer coating were remarkably improved compared with the single layer coating. The effects of migration of conducting materials on the film properties of multilayer coating were investigated by using contact angle and Fourier transform infrared/attenuated total reflection(FT-IR/ATR). It was found that the migration of dopant(dodecyl benzenesulfonic acid, DBSA) molecules were occurred from film-substrate interface to film-air interface in the organic conductive coating system but not in the inorganic one.

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The Effects of Nicotinamide on the Serum Lipid Composition in Streptozotocin-Induced Diabetic Rats (Nicotinamide가 Streptozotocin 당뇨성 쥐의 혈중 지질 성분에 미치는 영향)

  • 최종원;손기호;김석환
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.20 no.4
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    • pp.306-311
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    • 1991
  • The purpose of this study was to investigate the effect of pretreatment with nicotinamide on the serum lipid composition and atherosclerotic index in streptozotocin ( STZ ) - induced diabetic rats. Nicotinamide pretreatment in STZ-induced diabetic rats inhibited the rise of serum glucose concentration. Serum total lipids and triglyceride levels in the STZ-induced diabetic rats were significantly higher than those in the control group. But in the group pretreated with nicotin-amide, triglyceride and lipid levels were significantly lower compared with those of STZ-induced diabetic rat group without nicotinamide. However, the serum phospholipid levels were not statistically different among treatment groups. In the STZ-induced diabetic group, the serum total cholesterol, VLDL, LDL-cholesterol levels and atherosclerotic index were higher and HDL-cholesterol level was lower compared to the control group. However, these changes were prevented by nicotinamide pretreatment. Pretreatment with nicotinamide significantly increased tile activities of serum lipase compared to the STZ-treated group. Aminotranferase (ALT, AST) activities were not significantly different in any of the groups.

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Effect of Random Interesterification on the Physicochemical Properties in Blends of Corn Germ Oil and Fully Hydrogenated Soybean Oil (옥수수기름과 극도경화대두 혼합유의 이화학적 성질에 대한 무작위 에스테르 교환의 영향)

  • Shin, Hyo-Sun;Chung, Kwang-Hyun;Chun, Je-Hyun
    • Korean Journal of Food Science and Technology
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    • v.23 no.3
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    • pp.360-365
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    • 1991
  • Effect of random interesterification on the physicochemical properties in blends of corn germ oil and fully hydrogenated soybean oil was studied. Interesterification by using 0.4% sodium methoxide at 80C was completed in 35 minutes as determined by HPLC analysis for triglyceride composition. Changes of melting point, solid fat content, crystal form, fatty acid and triglyceride composition was investigated. After the interesterification, melting point and solid fat content were decreased, and coarse and large crystals were modified to fine and uniform. Fatty acid composition was not altered but triglyceride composition was largely altered. Interesterified blends of corn germ oil and fully hydrogenated soybean oil made with 80%, 20% and 75%. 25%, respectively, had desirable characteristics of the margarine for home use.

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Effect of Seatangle Oligosaccharide Drink on Serum and Hepatic Lipids in Rats Fed a Hyperlipidemic Diet (해조 올리고당 음료의 고지혈증 유도 쥐에 있어서 혈청 및 간장의 지질 변화에 미치는 영향)

  • 주동식;이진경;최용석;조순영;제외권;최종원
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.32 no.8
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    • pp.1364-1369
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    • 2003
  • In this study, we investigated the effect of seatangle drink and seatangle extract product on weight gain and serum and hepatic lipid composition in rats fed a hyperlipidemic diet. In the dietary hyperlipidemia induced rats, it was observed that serum triglyceride, phospholipid, total lipid, LDL-cholesterol level and atherosclerotic index were higher, while the HDL-cholesterol level was lower when compared to the normal group. Total hepatic lipid and cholesterol content of the dietary hyperlipidemia induced rats was conspicuously decreased by seatangle drink and seatangle extract product treatment. Especially, triglyceride content was decreased to 30% by seatangle drink treatment, and 45% by seatangle extract product treatment.