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- 저자 : 최영환 ( Yeong Hwan Choi ) (검색결과 35 건)
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페라이틱 강 배관내의 원주방향 표면균열 평가를 위한 새로운 Z-Factor의 개발
최영환,정연기,이정배,Choi, Yeong-Hwan,Chung, Yeon-Ki,Lee, Jeong-Bae,WilkowsKi, Gery 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.6
The purpose of this paper is to develop new Z-Factors to evaluate the behavior of circumferential surface crack in ferritic steel piping including base metal and Submerged Arc Weld(SAW) metal in nuclear power plant. The Z-factor is a load multiplier to convert plastic load to elasto-plastic load. However the current Z-Factor is a load multiplier to convert plastic load to elasto-plastic load. However the current Z-Factor gives too conservative results. In this study, a J-estimation method, SC.TNP method, which is based on GE/EPRI expression, is used to develop new Z-Factors. The desirabilities of both the SC.TNP mehtod and the new Z-Factors are examined using the previous experimental results for the circumferential surface crack in ferritic steel pippings. The results are as follows ; (1) The SC.TNP mehtod is good for describing the circumferential surface crack behavior in farritic steel pipings, while the well-known R6 mehtod and DPFAD method give too conservative results. (2) The ASME-Z-Factor method using nwe Z-Factors well predicts the behavior of circumferential surface crack in ferritic steel pipings including base emtal and SAW metal.
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최영환 ( Yeong Hwan Choi ) 한국독서학회 2008 독서연구 Vol.0 No.19
The concept of learning Hangul characters is defined by character-sound correspondence. ① character-sound correspondence ①′ learning characters ② sound-meaning correspondence ②′ learning spoken language ③ character-meaning correspondence ③′ learning written language 2. There are several elements of learning Hagul. elements of learning Hangul character-sound relation a category of learning ㉮ vowels and consonants ㉯-1. 21 syllables with a vowel ㉯-2. 378 syllables with a consonant + a vowel ㉰-1. syllables with 7 final consonants(syllable coda) that correspond to 7 sounds character-sound correspondence learning Hangul
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누룩으로부터 전분 분해 활성이 우수한 Rhizopus oryzae 균주의 분리
최영환 ( Yeong Hwan Choi ),최다혜 ( Da Hye Choi ),박은희 ( Eun Hee Park ),김명동 ( Myoung Dong Kim ) 한국미생물생명공학회 2016 한국미생물·생명공학회지 Vol.44 No.3
The amylolytic enzyme activities of nuruks collected or produced in this study were examined. A maximum α-amylase activity of 24,747.1 ± 777.7 units/mg protein was obtained for a nuruk incubated at a relative humidity of 40% at 30℃. A nuruk matured at a relative humidity of 50% at 25℃ showed the highest glucoamylase acitivity. Among the 98 fungal strains isolated from the nuruk exhibiting the highest amylolytic enzyme activities, 26 strains of Aspergillus oryzae and 18 strains of Rhizopus oryzae were identified. Rhizopus oryzae MBF345 showed an α-amylase activity of 36,724.9 ± 10.2 units/mg protein and a glucoamylase activity of 4,911.8 ± 48.1 SP. These values were 1.7-fold and 1.4-fold greater, respectively, than those of the control strain. Strain MBF345 was deposited as KCTC46312 in the Korean Culture Type Collection.
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다문화 사회와 국어교육 ; 초등학교 국어 교실 현장의 다문화 교육 방향
최영환 ( Yeong Hwan Choi ) 국어교육학회 2009 국어교육학연구 Vol.34 No.-
The purpose of this study is to provide a recognition of multicultural students for korean language education. Firstly, we have to analyze the goal of multicultural education. Secondly, we can categorize multicultural students into 54 types. Thirdly, the teaching materials are reconstructed by 4 factors.
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