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崔尙惇,趙龍在,申光錫 경북대학교 과학교육연구소 1993 科學敎育硏究誌 Vol.17 No.-
As easy way to utilize the isolation-projection technique in deriving the cyclotron absorption formula is introduced.
열역학 실험식에 의한 Cd-Zn계의 안정 및 준안정 상태도의 계산
崔舜惇,權海旭,金星秀 嶺南大學校 工業技術硏究所 1986 연구보고 Vol.14 No.2
For quantitative predictions of the metastable features and the compact expression of phase equilibria encountered in the extractive metallurgy of cadmium and zine, the calculations of stable and metastable equilibrium diagrams of the Cd-Zn system are made using the four parameter subregular solution model. Parameters of the thermodynamic functions are derived from the phase diagram data of "Bulletin of Alloy Phase Diagrams" and the enthalpy data of Wittig and Kleppa. Stable equilibrium diagram and thermodynamic quantities re-calculated from the optimized parameters agree with all the experimental data within the errors. Such metastable phase equilibria as the chemical spinodals, the locus of compositions and temperature where the Gibbs energies of the liquid and solid are equal(To), the metastable extensions of the solidus and liquidus curves, and metastable miscibility gaps. Excellent agreement of the calculated solvus boundary data with the experimental data is believed to provide a correct expectation of the metastable phase equilibria.
최순돈,민봉기,양승봉,신현준 영남대학교 공업기술연구소 2000 工業技術硏究所論文集 Vol.28 No.1
We studied the homogeneous plating on the dented part of door frame by decreasing or increasing the current density, installing air blower, adjusting the length between anode and cathode, using auxiliary anode, developing the new plating bath and etc. When we performed the zinc cynade plating, there was no way to achieve the homogeneous plating layer without using auxiliary anode. However, it wasn't a suitable and efficient method for appling to the real process. After we developed the plating bath that had the uniform current density, we were able to get the homogeneous plating layer of zinc on the dented door frame.
최상돈,김영미,이연주,석적영,조상규 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.-
If we apply a circularly polarized light to semiconductors, in the external static magnetic field, then the electrons absorb the light at the resonance frequency, resulting in the interband-transition from valence band to conduction band. The linewidth is affected by various mechanisms. Here we will compare the isolated operator method and the single operator method.
수목추출물의 생리활성에 관한 연구(Ⅹ) : 헛개나무 목부의 항균활성 물질 Antifungal Compounds of Hovenia dulcis
최윤정,이학주,이성숙,최돈하 한국목재공학회 2003 목재공학 Vol.31 No.1
항균활성이 우수한 혓개나무 목부 에탄올 조추출물로부터 7종의 화합물을 단리하였으며, 기기분석 결과 flavonoid인 5-hydroxy-7methoxyflavone를 비롯하여 5,7-dihydroxyflavone (chrysin). 5,7-dihydroxyfla-vanone(pinocembrin), 3,5,7-trihydroxyflavanone (pinobanksin), 3,4',5,7-tetrahydroxyflavanone (aroma-dendrin)과 stilbenoid인 3-hydroxy-5-methoxystilbene과 3,5-dihydroxystilbene (pinosylvin)으로 각각 동정되었다. 이들 단리물질에 대한 항균활성을 조사한 결과 stilbenoid인 3-hydroxy-5-methoxystilbene이 공시균주의 생장을 완전히 저해하여 단리물질 중 활성이 가장 높은 것으로 나타났다. 그 다음이 pinocembrin과 pinosylvin으로 Cryphonectria parasitica, Trametes versicolor, Tyromyces palustris 그리고 Trichoderma viride에 대한 높은 균사생장억제율을 나타내어 활성이 우수한 것으로 나타났다. 그러나, flavonoid인 pinobanksin, 5- hydroxy-7-methoxyflavone, chrysin, 그리고 aromadendrin은 항균활성이 낮은 것으로 나타났다. 이상의 결과, 헛개나무 목부 에탄올 조추출물의 높은 항균활성은 3-hydroxy-5-methoxystilbene과 pinocembrin, 그리고 pinosylvin에서 유래된 것으로 사료되었다. Antimicrobial activities of plant extractives were investigated to develop a natural fungicide. Two stilbenoids and five flavonoids were isolated from wood extractives of Hovenia dulcis (Rhamnaceae) which had been selected due to its high antifungal activity among the tested species. The chemical structures of isolated compounds were determinded as : 5-hydroxy-7-methoxyflavone, 5,7-dihydroxy-flavone (chrysin), 5,7-dihydroxyflavanone (pinocembrin), 3,5,7-trihydroxyflavanone (pinobanksin), 3,4',5,7-tetrahydroxyflavanone (aromadendrin), 3-hydroxy-5-methoxystilbene and 3,5-dihydroxystilbene (pinosylvin) on the basis of Mass and NMR spectroscopic data. According to the results of antifungal test, 3-hydroxy-5-methoxystilbene was evaluated as the strongest antifungal compound among the tested compounds and next were pinocembrin and pinosylvin, but those also had high hyphal growth inhibition activities against C. parasitica, T. versicolor, T. palustris and T. viride. However, pinobanksin, 5-Hydroxy-7-methoxyflavone, chrysin and aromadendrin showed very low antifungal activity. In this regard, it could inferred that high antifungal activity of wood extractives of H. dulcis were derived from 3-hydroxy-5-methoxystilbene, pinocembrin and pinosylvin, respectively.
崔尙惇 慶北工業專門大學 1974 論文集 Vol.11 No.-
Some relations between the thermodynamic potential and the time-dependent Green functions are deduced.
崔尙惇,金泰縣,安琮準,李相錫,崔昌鎬 경북대학교 과학교육연구소 1989 科學敎育硏究誌 Vol.13 No.-
Heuristic understanding of Mori's problem is introduced
Green-Kubo 형식에 의한 전기전도도 Tensor
崔尙惇,李三寧,李國煥 경북대학교 산업기술연구소 1987 産業技術硏究誌 Vol.14 No.-
Electric conductivity tensor is obtained on the basis of the Green-Kubo formalism.
최상돈,강남룡 경북대학교 과학교육연구소 1996 科學敎育硏究誌 Vol.20 No.-
We review a many-body theory of megneto-optical conductivity for a system of electrons interacting with phonons which was introduced already by the present authors [Progr. Theor. Phys. 96, 307 (1996)]. The scattering factors appearing in the conductivity tensor are calculated in datail by the many-body technique.
崔孝惇,洪性一 慶一大學校 1993 論文集 Vol.9 No.1
Production planning and inventory control are important issues due to the large-scale and complexity of a current production system. Especially, there have been many researches in the aggregate production planning, but most of studies do not consider a fuzziness about the objective preference of a decision maker and represent an uncertainty as probabilistic measure. To make up these points, an interactive fuzzy algoritm is developed for quantifying a fuzziness by interaction between decision analyst and decision maker. This paper presents a basis for applying this algorithm to the aggregate production planning with multi-objective.