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이창우,홍용표,박종혁,김한필 한국조명·전기설비학회 2012 한국조명·전기설비학회 학술대회논문집 Vol.2012 No.10
Recently, the use of high efficient LED lighting is recommended as a way of energy saving and environment preservation. Integrating Sphere is commonly used for LED lighting measurement especially CCT(Correlated Color Temperature). However, Integrating Sphere can cause a high measurement error because of the position of light source and ambient environment. So, We predicted the variation of Correlated Color Temperature according to measurement position on Integrating Sphere.
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Stress Behavior Related to the Boron and Nitrogen Concentration of W-B-N Thin Films on Si Substrate
이창우 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.3
Stress behaviors were studied to investigate the internal behaviors of boron and nitrogen in 1000 -thick tungsten boron nitride (W-B-N) thin lms. Impurities in the W-B-N thin lms provide stung eects that were very eective for preventing interdiusion between interconnection metal thin lm and silicon substrate during subsequent high temperature annealing process. Although boron and nitrogen concentrations increase linearly as the structure of thin lm changes from hexagonal or tetragonal to fcc structure. Resistivity is greatly enhanced as a function of N2 partial pressure ratio of 5 % when sample is not anealed. When the W-B-N thin lm with N2 p.p.r. of 1.25 % is incorporated into W-B thin lms without changing thickness, stress decreases minimum value of 1.8 10^10 dyne/cm².
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광원의 스펙트럼 분포에 따른 적분구상 상관 색온도 변화
이창우,배성완,강태형,박종혁,김한필 한국조명·전기설비학회 2012 한국조명·전기설비학회 학술대회논문집 Vol.2012 No.10
We investigated the influence of spectral reflectance of integrating sphere surface which is coated diffused materials such as BaSO4 or PTFE for the Correlated Color Temperature(CCT) change. We calculated the CCT variation through optical simulator by changing the spectral distribution of light and proved it can happen the big change resulted from tiny difference of reflectance.
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이창우 安東大學 1982 安東大學 論文集 Vol.4 No.1
The publication of SPE (Chomsky & Halle, 1968) has led to controversial issues on the abstractness in phonology. Though it doss not specify explicitly how different underlying representations may be from their surface forms, there seem to be two extremes: the abstract and the non-abstract. TGP argues that UR can be extremely abstract if necessary, ie., if at least some plausible explanation were to be achieved in seemingly implausible phonological phenomena. But NGP does not allow such an abstract analysis as that of TGP. It proposes several constraints so as to reduce the strength of TGP, among which are TGC, NOC, P and MP-rule Classification, and SSC. TGC: all rules should express transparent surface generalization, that is, generalizations that are true for all forms. NOC: extrinsic rule ordering should be excluded from generative phonology. P-and MP-rule Classification: all rules, if they are to be natural at all, should be formulated in purely phonetic terms. If not, they are MP-rules. SSC: compared with TCP`s MSC, SSC can provide a better solution to how phonemes are combined, and how they are described morphophonemically within a particular language. In spite of its advantages over TGP, NGP leaves a few questions unsolved, eg., how naturalness can be achieved by means of TGC, NOC, or SSC. It does not say much about the "why" of its naturalness. In order to fill the gap, to reduce some extent of abstractness, I propose two other constraints: Direction and Distance. The Direction Constraint implies that the process deriving the output of a rule should be explained in terms of "naturalness" with respect to linguistic competence, generality, plausibility, simplicity, and predictability. The Distance Constraint is a constraint imposed between UR and the surface form. If in a rule the phonetic characteristics of UR are far from those of surface forms, the rule is less natural, and vice versa.
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