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氣體(기체)-液體(액체) 크로마토그래피에 의한 C₁-C(5) 탄화수소류의 同時分析(동시분석)과 그 適用(적용)
리선행 ( Sun Haing Lee ),리화신 ( Hwa Shim Lee ),서정기 ( Jeung Ki Seo ) 경북대학교 과학교육연구소 1989 科學敎育硏究誌 Vol.13 No.-
The 18 components of C1-C5 hydrocarbons were well separated on a single, packed column operated ated around 40t within 20 mm. The chromatographic column is 25% sebaconitrile / chromosorb PAW (lOrn x O3cm, 60-80 mesh). The optimum flow rate was determined by making a simple Van Deemter plot of the number of theoretical plates VS. linear gas velocity. The most efficient flow-rate of N2 carrier gas was at 35mg / mm, and the mumber of theoretical plates was 5,000-10,000. The linearity of calibration curves were checked ranging ppm to % concentration of CR4 and C:1 11$. Peak through C5 hydrocarbons, and relative standard deviations of 10 measures were less than 2.1%.
科學?域(과학합역)에서의 聯想辭典作成(련상사전작성)과 그 活用性(활용성)
오대섭 ( Dae Sub O ),리선행 ( Sun Haing Lee ),손영희 ( Yong Hui Son ) 경북대학교 과학교육연구소 1988 科學敎育硏究誌 Vol.12 No.-
The fundamental and important thing, for science education, is to clarify the concept that represented by language. Accordingly, we in-troduce “the associative method”, which is largely treated on psychology and as we measure the associative frequency of the words containing sci-entific meaning, we make an associative dictionary. Finally it would suggest the utilizable method in the actual situation of instruction of a science course of secondary school. That is to say, as we measure the frequency of associative word on a given word, we catch the intuition or preconception concerned with that word. As we deal with it educationally, we will search the effective method which can be utilized in teaching of concept which is the most im-portant task in the science education. It was identified that the frequency of experience in common things is the decisive factor of the frequency of the association for the given stimulating word. Therefore, we could conclude that the associative dictionary producted on this thesis, which is considered the content structures of subject matter and students` cognitive structures, can be utilized as an useful material in a real situation of instruction.
이소니트로소벤조일아세톤 이민 유도체의 코발트 (II) 착물의 합성
오대섭 ( Tae Sub Wu ),리선행 ( Sun Haing Lee ),조래 ( Young Jo ) 경북대학교 과학교육연구소 1985 科學敎育硏究誌 Vol.9 No.-
Novel cobalt (II) complexes of the type Co (IBA-NR) 2 and Co (IBA-NR) 2, Where IBA-NH and IBA-NR represent isonitrosobenzoylacetone imine and its derivatives (i.e.methy1, ethy1, n-propy1, n-buty1, and benzyl) respectively, have been prepared. The elemental analysis and the spectral data such as the ir, nmr, and electronic absorption spectra of the cobalt (II) complexes was used for the identification of the complexes. It shows that one of the isonitroso group of IBA-NH acts as a ligand site of the cobalt metal through the oxygen atom to form 6-membered chelate ring while that of the other IBA-NH ligand in the same complex does as a ligand site through the nitrogen atom to form 5-membered ring for the square planar Co (IBA-NH) 2 complex. It was also determined that the isonitroso groups of two IBA-NR take a role of the ligand of cobalt through the nitrogen atom to form 5-membereed ring for the square planar co (IBA-NR) 2 The structure of the Co (I I) complexes is similar to that of isoni-trosoacetylacetone imines studied by other researchers.