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Seong Hoon Kim,Ji Hoon Kim,Jae Hoon Lee,Dong‑Woo Suh,Jae Sang Lee 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.9
Prediction of retained austenite fraction is quite important in designing advanced high strength steels since retained austeniteis the source of transformation-induced plasticity. The present study investigates the phase constitution of a medium-carbonQ&P steel by comparing various approaches to the transformation stasis of bainitic ferrite and applying them to the partitioningprocess. Among them, the modified GEB approach gave the best agreement with the experimental observation, includingthe effects of heat-treatment condition and chemical composition on phase constitution. This indicates phase transformationduring partitioning can be effectively described by the physics of Gibbs energy balance approach.
이범재,황의환,노재성,홍성수 忠南大學校 産業技術硏究所 1996 산업기술연구논문집 Vol.11 No.2
The effect of particle size of Al powder and water repellent agent on frost resistance, absorption ratio and structure of micropore was examined to improve the physical properties and durability of ALC. The compressive strength and the tensile strength are increased and independent of water repellent agent when the specific gravity is increased in the range from 0.4 to 0.7. According as the added amount of water repellent agent was increased, frost resistance was improved and absorption ratio was decreased. ALC produced from fine Al powder has a low volume reduction by scaling and a sound apperance after freezing/thawing test and top surface freezing test. The results from this research can be expected to be utilized for stabilization and growth of ALC industry.
벼 무논골뿌림裁培時 播種期가 生育 및 收量에 미치는 影響
池在浚,朴裁成,朴成圭,李尙榮,洪性澤,孫錫龍 충북대학교 농업과학기술연구소 1999 農業科學硏究 Vol.16 No.-
This study was carried out to determine the optimum seeding date for the rice(Oryza sativa L.) cultivation of the puddled-soil drill seeding, which is one of the efficient labor saving cultural methods, at the central part of Korea. Namweonbyeo, Anjungbyeo and Ilpumbyeo were seeded on four dates from April 10 to May 25, 1994 with the 15 day interval in the paddy field. In order to examine the adequate seeding date, the growth characters, yield components and yields were investigated. The coleoptile emerged 1 or 2 days earlier in Namweonbyeo than in Anjungbyeo and Ilpumbyeo, and later seeding resulted earlier coleoptile emergence. The number of seedling stands were higher in the order of Namweonbyeo, Anjungbyeo and Ilpumbyeo, was increased at the later seeding and was 81 to 88 seedlings on April 10 seeding. The plant height, number of leaves, number of tillers and dry weight at 50 days after seeding of all three cultivars were higher at later seeding. Leaf area index(LAI) were higher in the order of Ilpumbyeo, Anjungbyeo and Namweonbyeo. LAIs at the heading stage, at 30 days after heading and at 30 days before heading were higher in that order. The dry matter weight at the 30 days before heading was higher in sheath and stem than that in leaf blade, while, at heading stage, it was higher in the order of sheath and stem, leaf blade and panicle. On the other hand, at 30 days after heading, it was higher in the order of panicle, sheath and stem and leaf blade. The number of panicles per m2 was greater in the order of Ilpumbyeo, Anjungbyeo and Namweonbyeo. The ratio of ripened grain was reduced as the later seeding date. Its ratio was higher in Namweonbyeo than in Anjungbyeo and Ilpumbyeo. Yield of Namweonbyeo was lower than those of Anjungbyeo and Ilpumbyeo. Yield was decreased as the seeding date was delayed. Namweonbyeo showed the highest yield at seeding on May 10, while Anjungbyeo and Ilpumbyeo showed at seeding on April 25. The seeding date was negatively correlated with the ratio of ripened grain. while the number of seedling stands was positively correlated with the number of panicle per m2.
발효조를 이용한 Monascus anka의 적색소와 황색소의 생산
강성국,임종환,정순택,김선재 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.6
Monascus anka를 이용하여 천연식용색소를 대량생산하기 위한 방법을 개발하기 위하여 발효조를 이용하여 적색소와 황색소의 색소생산의 최적 배양 조건과 생산된 색소의 색깔 특성을 조사하였다. Monascus anka 적색소와 황색소를 생산하였는데, 이들 색소는 균체내색소와 균체외 색소로 구분되었다. 균체의 적색소(ERP)는 494nm에서, 균체외 황색소(EYP)는 380nm에서, 균체내 적색소(IRP)는 506nm에서 그리고 균체내 황색소(IYP)는 388nm에서 최대 흡광도를 나타냈다. 적색소와 황색소 생산, 색조의 특성 및 균체증식력을 배양 온도, pH, 쌀가루 농도, peptone 농도, magnesium sulfate 농도, 통기량 및 교반속도에 대하여 조사한 결과 적색소 생산력은 30℃, 초기 pH 6.0, 쌀가루 농도 3~5%, peptone 농도 0.05%, magnesium sulfate 농도 0.25%, 통기량 0.1vvm 교반속도 300rpm의 조건에서 최대치를 보였으며, 이때 ERP, EYP, IRP 및 IYP는 각각 A_494nm 0.84, A_380 nm 0.71, A_506 nm 1.18, A_388 nm 1.10, L값은 각각 29.40, 6.44, 34,98, 8.94, a값은 각각 5.76, -1.08, 11.83, -1.55, b값은 각각 18-19, 3.41 27.26, 6.16 그리고 균체량은 7.4 g/l을 보였다. 또한 황색소 생산력은 온도의 경우 적색소 생산을 위한 최적온도 보다 높은 35℃ 부근에서 우수하였으며 초기 pH와 쌀가루 농도는 적색소 생산을 위한 최적조건과 같았고, 질소원과 무기염의 농도가 높을수록 그리고 통기량이 많을수록 황색소 생산력이 우수하였다. 적색소와 황색소 생산을 위한 발효조의 교반속도는 100~300 rpm이 적합하였다. Production of Red and Yellow Pigments from Monascus anda in a Jar Fermenter, Seong-Gook Kang, Jong-Whan Rhim, Soon-Teck Jung^* and Sun-Jae Kim. Department of Food Engineering. Mokpo National University Chonnam, 534-729, Korea - In order to develop the method for mass production of natural food colorant from Monascus anka, optimum cultivation conditions for producing red and yellow pigments by cultivating the mold in a jar fermenter and their color characteristics were investigated. The mold produced red and yellow pigments both intracellularly and extracellularly. These pigments showed unique light absorption characteristics with maximum absorption of 494, 380, 506, and 388 nm for extracellular red pigment (ERP), extracellular yellow pigment (EYP), intracellular red pigment (IRP), and intracellular yellow pigment (IYP), respectively. Optimum conditions for producing red pigments were found to be temperature 30℃, initial pH 6.0, rice powder 3~5%, peptone 0.05%, magnesium sulfate 0.25%, aeration rate 0.1vvm. Optimum temperature for producing yellow pigments was around 35℃ which is higher than that of producing red pigments. The initial pH rice powder concentration for producing yellow pigments were the same as those of producing red pigments. The higher concentration of nitrogen source and inorganic salt, aeration rate, the more the yellow pigments were produced. Them optimum agitation speed was 100~300 rpm for pigment production.
김우성,이선화,김상엽,정동윤,김재이,이영자,이홍재,정성욱,박흥재 한국환경과학회 2003 한국환경과학회지 Vol.12 No.10
Pesticides were extracted from samples with 70% acetone and methylene chloride in order, and then cleaned up via open-column chromatography apparatus packed with fiorisil, and finally analyzed simultaneously the organophosphorus pesticides using GC/NPD, Ultra-2 and Ultra-1 fused silica capillary columns were used to separate and identify the products. Recovery of most analytes from soybean sample, taken from pesticide residues well, was greater than(80%) for all except(6) analytes. This method can simultaneously determine multiple pesticides with a high degree of accuracy and precision.
비정질 인듐갈룸ᅳ아연-산화물 박막트랜지스터 기반의 AMOLED 화소 회로
이재표(Jae-Pyo Lee),유경민(Kyeong-Min Yu),장진녕(JinNyoung Jang),홍문표(MunPyo Hong),배병성(Byung Seong Bae) 호서대학교 공업기술연구소 2013 공업기술연구 논문집 Vol.32 No.2
본 논문은 비정질 인둠ᅳ갈f ᅳ아연-산화물 박막트랜지스터 (a-IGZO TFT)를 이용하여 능동형 유기발광다이오드 (AMOLED)용 문턱전압(Vth )을 보상하는 화소 회로를 제안하였다. 산화물 TFT는 n-채널 TFT로써, 우리는 n-채널 TFT 특성으로 회로를 최적화하였다. 제안된 화소 회로는 회로 시뮬레이션 뿐만 아니라 회로 분석을 이용하여 확인되었다. 제안된 화소 회로는 AMOLED에서 구동 TFT의 문턱전압 변화를 보상할 수 있다. 제안된 화소 회로를 이용함으로써, 문턱전압 보상은 달성되었다. rhis paper proposes a tnresnold voltage compensation pixel circuit for active-matrix organic light-emitting diode (AM OLED) using amorphous indium-gaUiimi-zinc-oxide thin-film transistors (a-IGZO TFTs), Oxide TFT is an n-channel TFT; therefore, we optimized the circuit for the n-channel TFT characteristics. The proposed pixel circuit was verified using circuit analysis as well as circuit simulations. The proposed circuit could compensate for the threshold voltage variations o f drive TFT in AM OLED. Using the proposed pixel circuit, threshold voltage compensation was achieved.