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精神分裂症 患者의 末梢血液細胞와 尿中 17-Ketosteroid 排泄의 日週期變動
金淡鉉 대한신경정신의학회 1979 신경정신의학 Vol.18 No.1
This study was undertaken to investigate whether there are any differences in some circadian rhythms of the schizoplifeiiics, compared with those of the normals. The neutrophils, lymphocytes, eosinophils, and urinary 17-Ketosteroid, sodium and potassium excrections were measured with time intervals in the eight schizophrenics and three medical students. The resuits were as follows; 1. In the normals, it was revealed th at the cyclic pattern of neutrophils had the maximum level in the early stage of activity span, but the cyclic patterns of lymphocytes and eosinophils, showed the minimum level in this stage. 2. In the Schizophrenics, the cyclic pattern of neutrophils had the maximum level during the late stage of activity span or rest span, but the cyclic patterns of lymphocytes and eosinophils showed the minimum level during this stage. 3. In the normal subjects, the circadian rhythms; of urinary 17-Ketosteroid excretion showed! the maximum level in the midstage of activity span, followed by a downward trend during the remainder of the day and through the rest span. A marked alterations of the circadian: rhythms of 17-Ketosteroid urinary excrections were found in the majority of the schizophrenics. 4. In the normals, the cyclic rhythms of urinary sodium and potassium excretions showed theminimum level during the late stage of activity span. On the other band, in tlie schizophrenics, it tended to reach the basal level in the early stage of activity span, and the maximum, level in the late stago of activity span
열차폐코팅의 미세구조가 TGO 계면 응력에 미치는 영향 평가를 통한 미세구조 형상 설계
김담현,박기범,위성욱,김기근,박수,석창성,Kim, Damhyun,Park, Kibum,Wee, SungUk,Kim, Keekeun,Park, Soo,Seok, Chang-Sung 한국군사과학기술학회 2020 한국군사과학기술학회지 Vol.23 No.5
Thermal barrier coating(TBC) applied to fighter and turbine engines is a technology that improves the durability of core parts by lowering the surface temperature of base material. The thermal stress caused by mis-match of the coefficient of thermal expansion between the top coating and the TGO interface is the main cause of TBC breakage. Since the thermal stress is dependent on the microstructure of the TBC, designing microstructure of TBC can improve the durability as well as lower the thermal stress. In this study, the effect of coating thickness, volume of porosity and vertical cracking on the thermal stress was analyzed through finite element analysis. Through the analysis results, a design range of a microstructure that can improve the durability of thermal barrier coating by lowering thermal stress is proposed.