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주령(週齡) 의 증가에 따른 생쥐 Leydig세포의 광학현미경적 형태와 초미세구조에 관한 변화는 다음과 같다. 1. 생후 1주군에서 미분화된 Leydig세포는 정세관 주위에서 관찰할 수 있었고, 핵은 방추형이며, 핵질과 핵막에는 이염색질이 많이 분포하고, 세포질에는 소포체와 사립체가 조금 분포하나 그 이외의 세포소기관은 거의 없었다. 2. 3주군에서의 Leydig세포는 아직 완전히 분화되지는 않았으나 정세관 주위에서 관찰되었다. 핵은 난형이며, 핵막의 일부 함입과 이염색질의 부착이 있고 세포질에는 잘 발달된 무과립성 내형질망과 membrane whorl이 있으나 그 이외 세포소기관의 발달은 미약하였다. 3. 5주군에서는 완전히 분화한 Leydig세포들의 군집이 정세관 주위에서 관찰되었다. 핵은 거의 원형이며, 핵에는 진염색질이 분포하며, 세포질에는 사립체의 발달이 현저하고, 그 이외의 세포소기관은 약간 증가하였다. 4. 7주군에서는 잘 발달된 정세관의 구조와 잘 분화된 Leydig세포들의 군집을 tubule의 각 공간에서 관찰할 수 있었다. 세포는 핵이 원형으로, 핵막은 뚜렷하고 세포질에는 무과립성 내형질망 지방소적, 용해소체, 사립체, 당원입자 등이 아주 잘 발달되어 있었다. This study was performed to investigate the ultrastructure of the Leydig cell on aging of the mouse. The results obtained were as follows. One week after birth: The undifferentiated Leydig cells are found around seminiferous tubules. The nucleus showed the fusiform shape. The heterochromatin was found to be adherent to the nuclear membrane and to be dispersed in the nucleoplasm. The smooth endoplasmic reticulum and mitochondria were poorly developed, and the other cell organelles did not appear at this stage. The cytoplasmic vacuolations began to appear. After 3 weeks: Not fully differentiated Leydig cells are present around tubules. The nucleus had oval shape, and some nuclear membrane was caved and adhered to the heterochromatin. The smooth endoplasmi.c reticulum and membrane whorl were well developed. But the other cell organelles were poorly developed. After 5 weeks: Clusters of fully differentiated Leydig cells are found around the tubules. The nucleus had round shape, and the nucleoplasm included an euchromatin. Numerous mitochondria were observed at this stage. After 7 weeks: Clusters of fully differentiated Leydig cells are located in the interspace of each tubules. The shape of nucleus was round, and nuclear membrane was prominent. The smooth endoplasmic reticulum, lipid droplets, lysosomal dense body, mitochondria, ribosome and glycogen were increased markedly in number.
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119 구급대원들의 직무만족도에 영향을 미치는 요인에 관한 연구 : 서울특별시 119 구급대원들을 중심으로
서의수 동국대학교 행정대학원 2009 국내석사
The purpose of this study is to search for improvement methods of job satisfaction by grasping the factors influencing to the job satisfaction of 119-members(EMS-Emergent Medical Service). We made up questionnaires for 119-members working in Seoul metropolitan city. For an empirical analysis of this study, the questionnaires were distributed to 783 members of 119-EMS in Seoul with self-administration method and available 644 copies of these questionnaires finally accepted in analysis. The results of this study are as follows; First, they have characters as man, the thirties, graduated university, married, the 2nd degree qualification of EMS, pay above 30,000Won/year. Second, the distinctions of job satisfaction in population statistical characteristics are as follows; 1. between the sex, no distinction in statistically. 2. in ages, the twenties(M=9.284) is high, the fifties(M=9.300), the forties(M=8.744), the thirties(M=8.192). These are meaningful in statistically. 3. the rank of members is meaningful in statistically. sobangsa(M=9.104), sobangjang(8.763), sobangkeo(M=8.114), sobangwee(M=8.000). 4. about duty, working area, education degree, marriage, career, the degree of certification, pay has no distinction in statistically. Third, the result of correlation analysis with Perarson correlation coefficient is that between the job satisfaction and duty characteristics, environment, stability of job, promotions, compensation, relationship, personal characteristics, above all has positive correlation. ( p <.01 ) Fourth, after multiple regression analysis, six factor was obtained the factor is ①personal positiveness, ②compensation, ③self-regulation, ④stability of job, ⑤environment and ⑥clearness of promotion. especially, the personal positiveness is the most significant factor. Fifth, the result of simple regression analysis is that more job satisfaction, more settlement on work and if lower job satisfaction, higher seeking employment is confirmed.
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