7차 교육과정 『화학』교과의 <물>단원 학습에 따른 고등학교 학생들의 물에 대한 학습 능력 변화 고찰

이우환,문대훈,현창식,한충훈,변종철 제주대학교 사범대학 2003 백록논총 Vol.5 No.1

[최승호를 기다리며] 그를 생각하며 나태함을 다잡는다

이우환 (사)방송기자연합회 2014 방송기자 Vol.17 No.-

국산무연탄의 소유공기량과 발생연소가스량의 산식에 관한 연구

이우환 한국마린엔지니어링학회 1981 한국마린엔지니어링학회지 Vol.5 No.1

The characteristics of typical 35 kinds of domestic anthracites among 155 kinds are studied to find the calculation formula for the required quantity of air and the combustion gas quantity. 1) The author's calculation formulae are as follows: ${A_0}={\frac{1, 000}{1, 064}}{H_1}+0.086(Nm^3/kg)$ ${G_0}={\frac{1, 000}{1, 110}}{H_1}+0.234(Nm^3/kg)$(1) Theoretically required quantity of air (2) Theoretical quantity of combustion gas 2) Theoretical quantity of air in combustion of domestic anthracite is always estimated more with Rosin's formula than author's one in the typical domestic anthracites which have the lower calorific value between 3, 000-8, 000 Kcal/kg and the difference of the calculated quantity of air becomes small, as the calorific value increases. 3) Theoretical quantity of combustion gas is estimated more by author's formula than by Rosin's one with the domestic anthracites which have more calorific value than 6, 700 Kcal/kg and is estimated less in the under range of the above calorific value. 4) Theoretical quantity of required air and quantity of combustion gas of domestic anthracite show ${\pm}$4% difference by Rosin's formulae in comparison with results of actual analysis, and about ${\pm}$1.5% by the author's one.

중유의 연소에 필요한 소요공기량과 발생가스량의 산식에 관한 연구

이우환 한국마린엔지니어링학회 1982 한국마린엔지니어링학회지 Vol.6 No.1

The characteristics of typical 17 kinds of fuel oils are studied to fine the calculation formulae for the required amount of air and the combustion gas amount. 1) The author's calculation formulae are as follows; (1) Theoretically required amount of air (2) Theoretical amount of combustion gas 2) Theoretical amount of the required air in combustion and combustion gas of fuel oils are always estimated less with Rosin's formula than with author's one. 3) Theoretical amount of the required air and the amount of combustion gas of fuel oils are more reasonable with author's formula than Rosin's one in comparison with results of actual analysis.

(Ln([20]DOTA)(NO₃)(H₂O)]²+(Ln=Pr³+, Sm³+, Gd³+, Dy³+) 착이온과 두자리 보조리간드(주게원자 ; N 혹은 O) 간의 화학평형

韓忠勳,李南昊,鄭德商,卞種轍,李又煥 濟州大學校 基礎科學硏究所 1999 基礎科學硏究 Vol.12 No.1

2-hydroxy-3-hydroxymethyl-5-methylbenzaldehyde(HHMMB)와 ethylenediamine 혹은 1, 3- diaminopropane의 축합반응에 의해 6-배위 칸막이 리간드 H₄L[A]와 H₄L[B]를 각각 얻은 후에 거대비고리 리간드 착물, Cu(H₂L[A])·H₂O, Cu(H₂L[B])·H₂O, CuFe(L[A])(NO₃)·4H₂O, CuFe(L[B])(NO₃)·4H₂O, [CuGd(H₂L[A])(NO₃)₂](NO₃)·2CH₃OH, [CuGd(H₂L[B])(NO₃)₂](NO₃)·2CH₃OH를 합성하였다. 2, 6-diformyl-p-cresol(DFPC)로부터 합성한 Ln-거대고리([20]DOTA)착물, [Ln([20]DOTA)(NO₃)(H₂O)](NO₃)·χH₂O{Ln(Ⅲ)=Pr, Sm, Gd, Dy}를 methanol용매에 2일 정도 정치함으로써 [Ln([20]DOTA)(NO₃)(CH₃OH]²+ 을 얻을 수 있다. 이 lanthanide[20]DOTA착물에서 배위된 CH₃OH이 주게원자가 N 혹은 O인 두자리 보조리간드, La(=0-phenylenediamine, 1, 10-phenanthroline, ethylenediamine, oxalic acid, malonic acid, acethylaceton)에 의해 치환될 때 평형상수(K)를 25℃ μ=0.1M NaClO₄에서 분광학적 방법으로 결정하였다. 보조리간드의 pKa는 o-phenylenediamine <1, 10-phenanthroline < ethylenediamine, oaxlic acid < malonic acid < acethylacetone이며, 이때 평형상수, K는 ethylenediamine < 1, 10-phenanthroline < o-phenylenediamine, acethylacetone < malonic acid < oxalic acid 경향으로 변하였다. Macroacyclic transition metal complexes such as Cu(H₂L[A])·H₂O, Cu(H₂L[B])·H₂O, CuFe(L[A])(NO₃)·4H₂O, CuFe(L[B])(NO₃)·4H₂O,[CuGd(H₂L[A])(NO₃)₂](NO₃)·2CH₃OH,[CuGd(H₂L[B])(NO₃)₂](NO₃)·2CH₃OH were prepared from the correponding hexadentate compartmental ligands, H₄L[A] and H₄L[B], which were obtained by the condensation of 2-hydroxy-3-hydroxymethyl-5-methylbenzaldehyde (HHMMB) and ethylenediamine or 1, 3-diaminopropane. Ln-macrocyclic([20]DOTA) complex, [Ln([20]DOTA)(NO₃)(H₂O)] (NO₃)₂·χH₂O{Ln(Ⅲ)=Pr, Sm, Gd, Dy}, which had been synthesized from 2, 6-diformyl-p-cresol(DFPC), was placed in methanol for 2 days, and (Ln([20]DOTA)(NO₃)(CH₃OH)]²+ was formed. The equilibrium constants (K) for the substitution of coordinated CH₃OH in the Ln-[20]DOTA complexes by various bidentate auxiliary ligands, La(=0-phenylenediamine, 1,10-phenanthroline, ethylenediamine, oxalic acid, malonic acid, acethylacetone) were determined by spectroscopic method at 25℃ and 0.1M NaClO₄. The pKa of auxiliary ligands is in the order of o-phenylenediamine < 1, 10-phenanthroline < ethylenediamine, oaxlic acid < malonic acid < acethylacetone, however the equilibrium constant(K) has shown the trend of ethylenediamine < 1, 10-phenanthroline < ethylenediamine oxalic and < malonic acid < acethylacetone, however the equilibrium costant(K) has shown the trend of ethylenediamine < 1, 10-phenanthroline < o-phenlenediamine, acethylacetone < malonic acid < oxalic acid.

이종금속간의 마멸에 관한 이론적 연구

신문교,이우환 한국마린엔지니어링학회 1986 한국마린엔지니어링학회지 Vol.10 No.2

The perfect and accurate methods to control the wear are not made clear so far. For this phenomenon only mating surface has been studied. In order to control the wear the essence of it has to be made clear. It is reported that adhesive wear might occure as a result of plastic deformation, the fracture and removal or transfer asperities on close contacting surfaces. On this view point the plastic flow was attempted to compare with fluid or electromagnetic flow. The partial differential equations of equilibrium for the plane strain deformation will make use of the method of characteristics. The characteristic curves or characteristics of the hyperbolic equation coincide with the slip lines by R. Hill's papers. By Hencky's stress equation, it is evident that if P and .phi. are prescribed for a boundary condition then it may be possible to proceed along constant .alpha. and .betha. lines to determine the value of the hydrostatic pressure everywhere in the slip line field net work. A wedge formation mechanism has been considered for an explanation of this matters. The analysis shows that there is a critical value, which depends on the hardness ratio and the shear stress on the interface, for the top angle of asperity is less than this critical value, the asperity can yield plastically despite of being harder than the mating surface.

이종 금속간의 용착마모에 관한 연구

신문교,이우환 한국마린엔지니어링학회 1985 한국마린엔지니어링학회지 Vol.9 No.1

The wear becomes the most complicated cause of making various machineries short lives. In the studies by many scholors so far, the accurate and perfect methods to eliminate it completely are not found yet owing to many affected factors. On this view point of Depositional Wear, the wear test with seven different specimens from the part of frequent usage of which are carbon steel, nickel, copper, aluminum, zinc, lead and tin was attempted to make clear the relation between the wear of different metals and their melting point, crystal structure, sliding speed, load and lattice factors. The results of this study are summerized as follows; 1) Worn amount of each metal is maximum when each metal is same quality. 2) The easier becomes the the formation of solid solution in the course of friction proceeding, the more it results in worn amount of each metal. 3) The samer is each metal in crystal structure as well as lattice factor, the more it results in worn amount of each metal. These results might be of use in designing machineries, selecting materials and operating machineries.

부산지역 문화시설의 '주름'사유 경향에 관한 분석

양주영,이우환,김기환 대한건축학회지회연합회 2010 대한건축학회지회연합회 학술발표대회논문집 Vol.2010 No.1

고등학교 과학 교과 단위수 적절성에 대한 고찰 : 화학 관련 탐구·실험 학습 사례

변종철,이우환,한충훈,문대훈 제주대학교 사범대학 2002 백록논총 Vol.4 No.1

건축공사 현장관리자 작업능력에 영향을 미치는 요인

신정현,이우환,최영화,안성훈 한국건축시공학회 2014 한국건축시공학회지 Vol.14 No.2

The success of construction projects is heavily dependent on the work ability of the field managers who manage theexecution of projects. The work ability of field managers is influenced by various elements such as job stress andindividual characteristics. The purpose of this study is to reveal the factors influencing the work ability of constructionfield managers in Korea. Work ability is evaluated bases on the Work Ability Index(WAI) developed by the FinnishInstitute of Occupational Health, while job stress is measured using the Korean Occupational Stress QuestionnaireShort Form developed by the Korean Occupational Safety & Health Agency. The results showed that field managersunder higher job stress have lower work abilities. In addition, it is revealed that exercise or religious practice have apositive influence on work ability. This study will help to increase the work ability and enable the efficientmanagement of organization at building construction sites. 건축공사 현장에서 공사관리를 수행하는 현장관리자의작업능력은 프로젝트의 성공여부에 많은 영향을 미친다. 따라서 본 연구는 국내 건축공사 현장관리자의 작업능력에영향을 미치는 요인을 파악하는 것을 연구의 목적으로 한다. 작업능력은 작업능력지수를 통해서 측정하였으며, 직무스트레스는 한국형 직무스트레스 측정도구를 통해서 측정하였다. 현장관리자의 작업능력은 직무스트레스가 높을수록 떨어지는 것으로 나타났다. 또한 운동, 종교보유도 현장관리자의 직무능력에 긍정적 영향을 주는 것으로 나타났다. 본 연구결과는 현장관리자의 작업능력을 향상시키는데도움을 줄 수 있을 것으로 기대된다.