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李球烈 大韓神經精神醫學會 1975 신경정신의학 Vol.14 No.2
The interest in Students mental health problems is notably increasing recently. The author applied the depression scale to 123 high school students (62 boys and 61 girl students). Evaluating the practical usefulness of this depression scale, the following results were obtained. 1. Among 25 students with a score higher than 18, 9 students showed mild problem symptoms and 16 students showed severe degree of problem symptoms. The result coincided with the clinically evaluated findings in these students. 2. It is the author's opinion that this depression scale is an useful aid in finding out the students with depression even by non specialist and consequently it may be helpful for the student's mental health, if this scale used properly. 3. To investigate a factor which might have caused the gradual increase of average score from the beginning to the end of semester, the further intensive study is desired.
이구열,이종웅 청주대학교 산업과학연구소 1997 産業科學硏究 Vol.15 No.-
The generalized lens conversion from thick lens to equivalent lens and its reversal have been introduced. In this study, we extend the concept of lens conversion from lens to lens group. A thin lens can be treated as a refracting surface which has equivalent power of refraction. At that case, if we repeat the equivalent lens conversion, the whole lens group can be transformed into equivalent lens group which have zero thicknesses and zero spaces between lenses. And, the reverse conversion is possible also. For example, the lens group conversion was applied to a cemented doublet and their third order aberrations are examined.