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국균을 달리한 탁주 양조 중 유리아미노산 및 유기산의 소장
이명환,이원경,김정림 한국농화학회 1987 Applied Biological Chemistry (Appl Biol Chem) Vol.30 No.4
Takju, a Korean traditional rice wine, was prepared using Koji and Nuluk which were inoculated with single or combination culture of Aspergillus niger, Aspergillus shirousamii, and Aspergillus kawachii to investigate changes in mineral, amino acid and organic acid during fermentation. The mineral content showed a range of 1.50∼15.20ppm for Ca, 0.22∼0.25ppm for Cu, 1.60∼2.10ppm for Fe, 0.17∼0.55ppm for Mn, 0.68∼1.00ppm for Zn, 3.00∼40.50ppm for K, 5.25∼19.50 for Mg, 1.43∼2.95ppm for Na, and 3.00∼63.0ppm for P. It has been found that Takju had 16 kinds of amino acid including aspartic acid. A. niger Nuluk showed the highest contents in total amino acids, while A. kawachii Koji was the lowest in amino acids. The major amino acids were glutamic acid, alanine, leucine, and phenylalanine. The order of organic acids from the highest content in Takju were citric acid$gt; tartaric acid$gt; pyruvic acid$gt; malic acid$gt; lactic acid $gt; acetic acid.
Tire 및 Tube 의 품질보강에 관한 연구(제6보)
이명환,박창호,이진범,김준수,염홍찬,홍종명,임동호 한국고무학회 1970 엘라스토머 및 콤포지트 Vol.5 No.1
The physical properties of tire and tube products as a series of experiments have been studied and practical usage has been discussed. 1. The tensile strength and elongation of experimental production of tire and tube revealed better values than those found in requirements of military specification. 2. Adhesion of carcass plies with domestic and foregin cords showed good results in physical properties. 3. Tensile strenght of carcass plies, tenacity of domestic cord and breaking energy of tire be exhibited good results.
이명환,안영필 한국고무학회 1970 엘라스토머 및 콤포지트 Vol.5 No.1
The influence of various calcium carbonate on the physical properties of natural rubber have been carried out extensive experiments on compounding. Final evaluation was made throughvarious kinds of physical. test-tensile strength, modulus, tear strength and hardnees-including particle size. The results are as follows: 1. Generally, the tensile strength, modulus and tear strength showed the similar tendency in various calcium carbonate compounding. 2. The maximum volume of general using have been obtained with 150 phr calcium carbonate in NR-CaCO₃ compounding. 3. The particle size of domestic calcium carbonate showed 1.0μ-2.6μ.
펄스 레이저 증착법을 이용한 BiFeO3BaTiO3 고용체의 강유전 및 누설전류 특성
이명환,김다정,박진수,김명호,송태권,도달현,김원정 한국물리학회 2015 새물리 Vol.65 No.6
A polycrystalline 0.67BiFeO3-0.33BaTiO3 solid-solution thin film was prepared on a Pt(111)/Ti/SiO2/Si(100) substrate by using pulsed laser deposition (PLD) at different pressure, such as 10 mTorr, 30 mTorr, 50 mTorr, and 100 mTorr, and the crystal structure, the microstructure, the leakage current, and the ferroelectric properties were investigated. The 0.67BiFeO3-0.33BaTiO3 thin film deposited at 30 mTorr exhibited good ferroelectric properties with a large remnant polarization (2Pr = 28 μC/cm2) and a low coercive field (2Ec = 342 kV/cm), which were due to the high (111) preferred orientation and the uniform large grain size. 펄스 레이저 증착법을 이용하여 Pt(111)/Ti/SiO2/Si(100) 기판 위에 0.67BiFeO3-0.33BaTiO3 박막을 10 mTorr, 30 mTorr, 50 mTorr, 100 mTorr의 다양한 산소 분위기에서 540 ℃의 온도에서 제작하여 결정구조, 미세구조, 강유전 및 누설전류 특성을 연구하였다. 30 mTorr의 산소 분위기에서 제작한 0.67BiFeO3-0.33BaTiO3 박막에서 우수한 잔류분극 (2Pr = 28 μC/cm2) 과 낮은 항전계장 (2Ec = 342 kV/cm)을 나타내었으며 이와 같은 결과는 X-선 회절패턴에서 나타나는 높은 (111) 방향으로 우선배향과 균일하고 큰 낟알에 기인하고 있다.