페놀誘導體 酸化防止劑의 Lipidperoxidation에 미치는 影響

李愚鵬,李貞鎬 경북대학교 과학교육연구소 1990 科學敎育硏究誌 Vol.14 No.-

The relative comparison of the effectivities of antioxidants(3, 5-Di-tert-butyl-4-hydroxybenzoic acid, its derivatives, BHT and 2, 6-Di-tert-butylphenol) gives the knowiedge of the substituent effect of phenolic antioxidants on lipidperoxidation. We used polarograpic method initiated by hemoglobin to measure te effectiveness of antioxidants. Protective Indices(P.I.) was used for the relative comparison of activities of antioxidants. P.I=Oxidation of emulsion with antioxidant(min)/Oxidation of control emulsion(min) The result result of experiment showed that BHT has the highest activity and stearyl ester has the lowest activity. From these results, we came to the conclusion that the activities of anti-oxidants depend on the substituent effect of phenolic antioxidant;inductive effect and steric effect.

토양보존을 위한 환경교육 교수 · 학습 프로그램

이우붕,정원우 慶北大擧校 師範大學 科學敎育硏究所 2000 科學敎育硏究誌 Vol.24 No.-

Humus serves important purposes in the life of soil, all of which contribute to its fertility. It retains essential plant nutrients such as potassium, nitrogen and phosphorus. It holds moisture easily and so prevents soils from drying out rapidly. It also keeps soil porous and permits the ready flow of air needed for root growth. The pores also help in the percolation of water downward to provide good drainage. The middle school program of education with environment should be action oriented program between knowledge and attitude, which means from knowledge to action. The aim of open class education with environment program must consist of structural system mode(fact·concept·generalization), pedagogy(explanation·participation) and evaluation(criticism·prediction).

Vitamin-C 유도체의 合成과 항산화제에 대한 效果

李愚鵬,김시호 慶北大學校 1991 論文集 Vol.50 No.-

High yields(85%) of 6-fatty acid esters of L-ascorbic acid were obtained by reacting L-ascorbic acid(16mmol) in 98% sulfuric acid for 72hr at 20℃ with 36% excess fatty acid. In concentrated sulfuric acid, L-ascorbic acid was rapidly sulfated to produce mainly L-ascorbyl 6-sulfate, which slowly reacted with fatty acid to produce L-ascorbyl 6-acylate. A simple, rapid, precise, and reporduciable method and an adaptable apparatus for polarographic measurement of lipid peroxidation and antioxidant activity is described. This method measures antioxidant activity within a few min. This antioxidants effects are increased if the carbon number is increase.

[1.1.1.1]Paddlane과 할로겐 화합물과의 반응

李愚鵬,吳東元,黃悳海,權明淑,鄭宰準 慶北大學校 師範大學 科學敎育硏究所 2002 科學敎育硏究誌 Vol.26 No.-

[1.1.1]Paddlane has an inverted structure at two bridge-head carbon atoms. We will describe the reaction of [1.1.1]Paddlane and [1.1.1.1]Paddlane. The reaction of [1.1.1]propellane with singlet methylene affored 1,3-Dimethylene as the major product and [1.1.1.1]paddlane as the minor products were obtained. The reaction of [1.1.1]propellane with triplet methylene was carried out in the similar conditions. The result afforded 1,3-Dimethylenecylopropane as the major product and various side products were also obtained. But no trace of [1.1.1.1]paddlane was detected. After the synthesis of [1.1.1.1]paddlane, continuously [1.1.1.1]paddlane reacts with iodide. The product that I expected for 1,3-diiodo-tricyclo[1.1.1.1]hexane is different. and has unsymmetrical structure.

새로운 Fluorene계 발광 고분자 합성

李愚鵬,吳東元,朴美淑,黃悳海,宋智怜,朴在均 慶北大學校 科學敎育硏究所 2004 科學敎育硏究誌 Vol.28 No.-

Poly [2,7-(9,9-di-n-hexyl-fluorene-co-9,9-dibenzylidenylflourene)-2,7diyl] was synthesized through nikel-catalyzed coupling between 9,9-disubstituted 2,7-dibromofluorene and new fluorene-based monomer, 9,9-dibenzylidenylflurene in good yield. The polymer containing new fluorene monomer, 2,7-dibromo-9,9-dibenzylidenyflu -orene, which not only has extended π conjugation, but also has sterically hinderd sudstituents at the 9-position. The polymer obtained is found to be soluble in conventional organic solvents such as chloroform and was characterized by GPC, ^(1)H NMR and ^(13)C NMR. Also the UV absorption band showed the peak of maximum absorption at 373 nm and the photoluminescence (PL) spectra emission band showed the peak at 558 nm yellowish green region.

중학교 과학교과서에서의 상상력 활용에 관한 연구

이우붕,박정혜,정원우 慶北大學校 科學敎育硏究所 2003 科學敎育硏究誌 Vol.27 No.-

Raising a Korea to be a leader in the international, informational 21C is the basic theme of the 7th education progress. To meet these kinds of needs, we must work on concentrating to bringing up creativity from understanding the basics of society. Creativity education means to raise up the creativeness of the students. All the students bear the potential of creativeness inside, and it can be brought out by education or natural causes. Developing and extending the ability for the students to think with flexibility or to think with originality is the main duty of the teachers. The main object of the research is to think about the ways to extend imaginative power in educating creative human, and then to lead the imagination related on the educational activity to the field of science. So we tried to divide the educational activity based on creativity in parts, and for each part Ⅰ provided the examples that are on the middle school science text so that we can provide the basis of building the creativity of students and to make the education field a creative one. Due to these educational causes I found out the reason why imaginative power education is in need and the categories of educational activity on imaginative power, and to go with that I also investigated on the ways to bring up imaginative power in class. Also I searched for the ways on how you should teach to develop imaginative power to applicate this research to the actual school classes, then I provided the 'class model' for developing imaginative power. After that I of drew up the essential teaching program that you can actually applicate, to follow I actually applied some techniques on classes. Our educational situation is under many restrictions to accept and apply many diverse materials that can develop imaginative power. But the biggest restriction is on the teachers themselves. Teachers must put much effort in preparing many materials and examples, and must also try to fulfill the students scientific thinking power by sharing their thoughts. It is impossible to develop imaginative power by training and taking exams to accomplish a special goal. We can never guess how the final result of imaginative power can come out, so it is almost impossible to train, prepare, estimate directly. So diverse materials in quantity and quality(that can valuate imaginative power), must also become the target of development.

환경 마인드 변화를 위한 환경교육 방안

이우붕,정원우 慶北大學校 師範大學 科學敎育硏究所 1999 科學敎育硏究誌 Vol.23 No.-

Our eco-centered ethics have time to change the mind about nature. The sustainable development in text century needs good relationship between science, technology and society. For understand this wholism we need new concept program for education within environment. The middle school program of education with environment should be action oriented program between knowledge and attitude, which means from knowledge to action. The aim of open class education with environment program must consist of structural system model(fact · concept · generalization), pedagogy(explanation · participation) and evaluation(criticism · prediction).

과학사에서 리비히(Ⅰ)

이우붕,정원우 경북대학교 과학교육연구소 1996 科學敎育硏究誌 Vol.20 No.-

Justus von Liebig, the modern chemist, used to scientists playing a less prominent role in society, may be taken aback to realize the considerable esteem that the public held the great organic chemist in during his lifetime. How had Liebig come to acquire such a reputation for statesmanship?

Tetraphenyldiazocyclopentadiene의 合成과 光反應

李愚鵬,李秉淑 경북대학교 과학교육연구소 1990 科學敎育硏究誌 Vol.14 No.-

Tetraphenyldiazocyclopentadiene is an useful compound to prepare carbene which is an activated intermediate in the photoreaction, pyrolysis and the other reactions. We have synthesized tetraphenyldiazocyclopentadiene from tetraphenylcyclopentadienone and toluene-p-sulphonylhydrazone. The yields were fairly good with 64%. tetraphenyldiazocyclopentadiene was irradiated with 400W UV Lamp(λ=365nm) in diethylether under nitrogen atmosphere. In the photoreaction we observed a carbene, prepared from tetraphenyldiazocyclopentadiene, underwent O-H insertion and C-H insertion reaction. We observed a mixture of 15 species in these reations with TLC analysis. But the major reaction was C-H insertion.

Eu를 포함하는 발광 고분자 합성

李愚鵬,吳東元,朴美淑,黃悳海,司空恩,朴在均 慶北大學校 科學敎育硏究所 2004 科學敎育硏究誌 Vol.28 No.-

Poly (9,9-dialkylfluorene-2,7-diyl) derivatives end capped with 2,7-dibromo-9,9-dihexylfluorene and conductive fluorene substituents have been synthesized through Ni(0), the nickel-catalysed reduction with metallic zinc-mediated polymerization. When electron and hole recombined and formed a exciton in emitting layer. Singlet exciton and triplet exciton is the ratio of one to three. One is fluorescence and three is phosphorescence, but phosphorescence is almost sustained a loss. Not only to shift blue region but to increase phosphorescence efficiency, it is substituted Eu for the terminal H in this polymer chain. P1-Eu showed green emission at 533nm while P1 had at 548nm. The main emission peaks of the P1-Eu shift shorter wavelength, besides we observed another emission peaks of the P1Eu at 418nm.