중학교 과학 교과서(화학 영역) 비교 분석

문정대,문성배 부산대학교 사범대학 과학교육연구소 1998 科學敎育硏究報 Vol.25 No.-

The purpose of this study is to compare and analyze the current science textbooks (chemical domain) of the middle school (newly compiled science textbooks in the sixth curriculum) and the former science textbooks (according to the fifth curriculum). The results are as follows : The revised science curriculum put emphasis on strengthening investigation activities, decreasing the quantity of study and introducing interesting contents. The newly compiled science textbook (chemical domain) of the middle school are more improved in terms of the contents and the composing structure than the former textbooks. But, it does not fully reflect the fundamental purpose of the sixth curriculum and leaves much to be satisfied as a textbook for an investigation. Therefore, it is necessary to improve desirably science curriculum and study continuously for compilation of an effective textbook.

1,2,3,4-Tetrahydrocarbazole-Chloranil의 이온間 電荷移動作用에 미치는 溫度 및 溶媒効果에 대한 硏究(第二報)

文正大 부산대학교 과학교육연구소 1977 교사교육연구 Vol.4 No.2

Absorption band for 1,2,3,4-Tetrahydrocarbazole-Chloranil Charge-Transfer Complex (CT complex) was determined by means of U.V spectrophotometer in two solvent systems, carbon tetrachloride and ethylene chloride, and their maximum absorption bands were found to be at 650nm in carbon tetrachloride and 647nm in ethylene chloride, respectively. Absorbance was obtained through the change of concentration and temperature at each wavelength: formation constant(K^(DA)_(f)) and molar absorptivity (_(ελ)^(DA)) were calculated from the slope and intercept obtained from the Benesi-Hildebrand equation into which'data was substituted. The solvent effect of CT complex was increased in ethylene chloride whose dielectric constant was larger than that of carbon tetrachloride, and the effect of temperature change in carbon, tetrachloride was almost not affected, but that of ethylene chloride was considerably affected.

한국 정상인에서 연령에 따른 뇌혈류분포와 혈류예비능의 변화 : Tc-99m HMPAO SPECT 에 의한 연구

문대혁,이희경,송호천,이재태,범희승,손혜경,정환정,민정준,김지열 대한핵의학회 1999 핵의학 분자영상 Vol.33 No.3

Purpose: The aim of this study was to evaluate the normal values of regional cerebral blood flow (rCBF) and cerebrovascular reserve (CVR) in normal children to aged volunteers using Tc-99m HMPAO. Materials and Methods: Thirty four right-handed normal volunteers (20 males, 14 females, mean age 40.3±24.9 years, range 4 to 82 years) were underwent rest/acetazolamide (ACZ) brain SPECT using Tc-99m HMPAO and the sequential injection and subtraction method. rCBF was estimated on the basis of a semiquantitative approach by means of right/left ratio, region/cerebellum and region to whole brain ratios in frontal, parietal, temporal, and occipital lobes, basal ganglia, thalami, and cerebellum. CVR was measured by means of % perfusion increase calculated as % mean count change compared to rest rCBF in each regions. Results: Mean values of right to left ratios range from 1.004 to 1.018. rCBF was highest in cerebellum and lowest in basal ganglia and thalami. Frontal and temporal rCBF decreased while occipital and thalami rCBF increased according to age. No sexual difference of rCBF was noted. Mean CVR was 29.9±12.9%. Mean CVR significantly increased to late teens, and declined thereafter. After 6th decade, CVR in both frontal lobes, left parietal lobe and right basal ganglia decreased significantly with advancing age. There was no sexual difference of CVR. Conclusion: Quantitative assessment of CVR was possible by ACZ Tc-99m HMPAO brain SPECT. It revealed that rCBF and CVR changed according to age in normal Korean volunteers. There was no sexual difference.

화학 교육의 당면한 문제

文正大 부산대학교 사범대학 과학교육연구소 1980 科學敎育硏究報 Vol.7 No.-

Kaolin分析에 關한 硏究 : 無水珪酸 製造에 關하여 for the proparation of silica

文正大 釜山工業大學校 1969 論文集 Vol.9 No.-

수입 외국산 모발세정용 화장품의 중금속 농도에 관한 연구

문정아,문덕환,박명희,안진홍,김종은,손병철,김대환,이창희,김휘동,이채언 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5

Objective : For the purpose of preparing the fundamental data and preventing the health impairment due yo heavy metals in hair cleaner. Methods and Material : The author determined the concentration of heavy metals(Fb, fn, Cr, Ni and Cu) in hair cleaner with flameless atomic absorption spectrophotometer. Results : The results were as follows : 1. The mean concentration of heavy metals in total hair cleaner were 0.046㎍/g for Pt, 0.O67㎍/g for Mn, 0.069㎍/g for Cr, 0.046㎍/g for Ni, and 0.022㎍/g for Cu, respectively. 2. There was not statistically significant difference to mean concentrations of each heavy metal in hair cleaner by producing nation. 3. The highest mean concentration of each heavy metal in hair cleaner by type of use were 0.140㎍/g for Mn in sensitive hair cleaner(p<0.05), 0.053㎍/g for Cu in others products(p<0.01). 4. The mean concentration of heavy metals in hair cleaner by type of hair cleaner were high at 0.O54㎍/g for Pb in shampoo products(p<0.O5), 0.120㎍/g for Cr and 0.06㎍/g for Cu in combination products(p<0.01). 5. The mean concentration of heavy metals in hair cleaner by acidity were high at 0.056㎍/g for Pb, 0.124㎍/g for Cr, and 0.032㎍/g for Cu in alkali products (p<0.05). 6. Correlation coefficient of heavy metal concentration in hair cleaner were 0.175 for Pb and Cr, 0.165 for Pb and Mn, 0.824 for Cr, and Mn, 0.189 for Cr, and Ni, 0.406 for Cr, and Cu, 0.197 for Mn and Ni, and 0.375 for Mn and Cu(p<0.05). 7. Exposure amount of heavy metals per when we used lOg of hair cleaner (onetime using amount) were 0.46㎍ for Pb, 0.67㎍ for Mn, 0.69㎍ for Cr, 0.46㎍ for Ni, and 0.22㎍ for Cu, respectively. Conclusion : As above results, there was very low level concentration of heavy metal in hair cleaner but we are using the hair cleaner everyday, therefore we can exposed to heavy metals as cronic exposure so the author suggest to prepare the program of preventing the health impairment due to heavy metals.

3-Methyltetrahydrocarbazole-Chloranil의 이온間 電荷移動 相互作用에 미치는 溫度 및 溶媒效果에 關한 硏究

文正大 釜山大學校 師範大學 1979 교사교육연구 Vol.6 No.2

Absorption band for 3-Methyltetrahydrocarbazole-Chloranil charge-transfer complex was determined by means cf UV spectrophotometer in four solvent systems, carbon tetrachloride, chloroform, dichloromethane and ethylene chloride, and the maximum absorption bands were found at 665nm, 523nm in carbon tetrachloride, 675nm, 523nm in chloroform, 676nm, 526nm in dichloromethane and 675nm, 525nm in ethylene chloride, respectively. Formation conStant(K_(f)) and molar absorptivity(ε_(λ)) of the 3-methyltetrahydrocarbazole-chloranil complex have been determined by Benesi-Hildebrand method. The solvent effect of charge-transfer complex was increased in etylene chloride which dielectric constant was larger than that of carbon tetrachloride, and the effect of temperature change in carbon tetrachloride was almost not affected, but that of ethylene chloride was considerably affected.

2-methyltetrahydrocarbazole-Chloranil Complex의 이온間 電荷 移動相互作用에 미치는 溫度 및 溶媒效果에 관한 硏究(第一報)

文正大 釜山大學校 師範大學 1978 교사교육연구 Vol.5 No.2

Absorption band for 2-methyltetrahydrocarbazole-ChloraniI Charge-Transfer Complex (2-MTHC CT complex) was determined by means of UV spectrophotometer in two solvent systems carbon tetrachloride and ethylene chloride, and their maximum absorption bands were found to be at 665nm, 516nm in carbon tetrachloride and 665nm, 525nm in ethylene chloride, respectively. Formation constant (Kf) and molar absorptivity (ελ)of these 2-MTHC CT complex have been determined by Benesi-Hildbrand method. This 2-MTHC CT complex was of endothermic reaction (4H>0) in ethylene chloride but exothermic reaction (4H>0) carbon tetrachloride and the effect of temperature change in carbon tetrachloride was considerably affected than that of ethylence chloride.

단체수요를 고려한 서비스산업의 수익관리 최적화 모형에 관한 연구 : 항공사 수익관리 모형을 중심으로 An Application Airline Industries

정대영,윤문길 한국항공대학교 경영연구소 2000 경영연구 Vol.7 No.2

수익관리(Revenue Management)는 공급과 수요관리의 문제점을 해결하기 위한 새로운 접근방법으로서 시장에서의 수요와 공급을 적절히 조절함으로써 수익을 최대한 시키는 경영기법이며, 경영과학분야와 실무적으로는 항공사 및 기타 소멸성 자산(Perishable-Asset)을 운용하는 서비스 기업에 빠르게 확산되고 있는 분야중의 하나이다. 본 연구에서는 할인요금에 대한 좌석할당에 있어서 미래에 발생할 수 있는 정상요금 예약의 기대수익보다 현재 요구된 할인요금의 수익가치가 더 크다면 할인요금 예약은 수용되어야 한다고 Littlewood[42]가 제안한 복수요금형태에 기반을 둔 좌석재고 통제규칙을 기초로 동적 계획법(DP: Dynamic Programming)의 특성을 고려하여 재고통제를 위한 수익관리기법에 관한 연구를 수행하였다. 모의실험은 제시된 최적화 모형과 판매허용용량을 정하여 허용가능 용량내에서 판매가능 여부를 결정하는 표준형 네스팅 방식을 통한 매출액의 비교를 실시하였다. Revenue management is a method that can help a firm sell the right inventory unit to the right customer at the right time and for the right price. It guides the decision of how to allocate undifferentiated units of limited capacity to available demand in a way that maximizes profit or revenue. This paper examines the problem of proper(optimal) control over the seat allocation on flight. We formulate and analyze a Markov Sequential Decision Model for airline revenue management on multiple-price by considering a simple form of airline group demand. Our model allows cancellation, no-show and overbooking. In this paper, we make assumptions on a single-leg flight but not on the arrival patterns for the various fare classes. As a result of Simulation, our numerical examples show that revenue gains of up to 9% are possible with our model, compared with an standard nesting method. It is demonstrated that our model is valid and possible application to airline industry and applicable to other problem of revenue management with perishable service or product such as ISP, Cruise, hotel, Mobile terminal with very short Product life cycle. The purpose of this paper has been not so much to provide a model for a specific airline industry, as to indicate the nature and significance of the general service industry problem and to demonstrate one approach, and its shortcomings, for resolving it. It is hoped that the presentation of these results will stimulate additional research, either along the lines suggested or in new directions, for what appears to be an important and pressing decision problem.

버섯 배지를 이용한 tyrosinase 저해제 발효

정승원,한대석,김석중,전문진 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.2

Tyrosinase는 식품의 효소적 갈변과 생체내에서 melanin 합성을 촉매하는 효소이다. 식용 가능한 tyrosinase 저해제의 발효생산을 통하여 melanin 합성을 저해하는 효과를 가지는 미백식품 소재를 개발하고자 현재 식품의 제조에 이용되고 있는 안전한 미생물을 대상으로 tyrosinase 저해능이 높은 균주를 선발하고 표고버섯을 주 배지원으로 발효시켜 저해제 생산의 적정조건에 대하여 연구하였다. 발효식품으로부터 분리된 NU-7을 tyrosinase 저해제 생산을 위한 발효균으로 선정하여 tyrosinase 저해제 생산 최적배지 조건을 확인한 결과 glucose가 3~20% 및 ammonium sulfate가 0~0.25%인 범위에서 균체량 증가에 따른 tyrosinase 저해제 생산능의 차이는 나타나지 않았으며, 무기질소원으로 첨가한 ammonium sulfate의 영향은 비교적 낮았다. 한편, 표고버섯(Lentinus edodes, Shiitake) 함량은 저해제 생산과 밀접한 관계를 나타내어 버섯함량(X)에 대한 저해제 생산량(Y)이 Y=-0.96X^2+13.07X+14.43의 상관식을 보였고, R value는 0.96으로 나타나 최적발효 조건을 위한 최소한의 배지는 표고버섯과 glucose 만으로도 가능한 것으로 판단되었다. 표고버섯을 이용한 발효액에서 곰팡이 독소로 알려진 아플라톡신은 검출되지 않았으며 따라서 이를 식용할 수 있는 가능성이 높은 것으로 판단되었다. Tyrosinase is an enzyme which catalyzes an enzymatic browning of some foods and in vivo synthesis of melanin. In order to produce natural and edible inhibitor of the enzyme which is expected to have whitening effect on melanogenesis, a microorganism was selected from fermented foods. It was named as NU-7, and cultured in mushroom (Lentinus edodes, Shiitake) media. Optimal media to produce tyrosinase inhibitor was formulated by varing nitrogen or carbon content. If glucose content was in a range of 3~20% and ammonium sulfate was in a range of 0~0.25%, production of inhibitor was independent of cell mass. Addition of ammonium sulfate as a nitrogen source had little effect on inhibitor production. Production of inhibitor (Y) was proportionally related to shiitake content (X) with a regression equation of Y=-0.96X^2+13.07X+14.43 (R=0.96). These results indicate that shiitake and glucose are necessary for the production of tyrosinase inhibitor. In the analysis of mycotoxin in culture broth, aflatoxin was not detected, suggesting that it would be probably edible.