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김형전 대한건축학회 1968 建築 Vol.12 No.3
건설공사에서 콘크리트의 골재(Aggregate)라 함은 모래(쇄골재) 자갈(조골재) 쇄사, 쇄석 기타 이와 유사한 재료를 말한다. 콘크리트의 주활동체는 시멘트이나 골재는 콘크리트 용적의 70-90%를 점하고 있으므로 이가 콘크리트의 성질에 미치는 영향은 극히 크다. 이 골재의 품질여가는 콘크리트의 강도 및 워커빌리티에 다대한 영향을 미치는 것은 물론 동일목적에 달하기 위해서는 골재의 종류에 따라 시멘트 사용량에 변화가 있으므로 골재의 양부는 경제적으로도 영향이 있다.
김형전,윤병주,임백인 中央醫學社 1975 中央醫學 Vol.29 No.6
Histologic features of eighteen cases of pityriasis lichenoides were reviewed. Of the epidermal changes, parakeratosis was found in 72%, invasion of the epi?dermis by mononuclear cells in 78%, focal cell death in 33%, eczema changes in ,61%, vacuolization of the basal cells in -36% and elongation of rete ridges in 44%. In the dermis, inflammatory cell infiltration was found mostly in the upper dermis and perivasculary in all specimens. The infiltrates consisted of mixture of lymphocytes and histiocytes, with a preponderence of lymphocytes, but large atypical cells were not observed. Of the other dermal features, papillary edema was found in 61%, RBC extravasations in 67%, and vessel changes in 39%. In some cases, the histologic findings were not correlated with clinical features and there was intermediate gradation in histologic features in other cases. On the basis of above findings, pity riasis lichenoides et variolifor is acute and pityriasis lichenoides chronica seem to be the variants of a single disease process. Even there was no complication of malignant reticulosis in studied group, further evaluation of these cases are needed.