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朴龍周 서울大學校 保健大學院 1964 公衆保健雜誌 Vol.1 No.1
An epidemiological survey was carried out towards 552 cases of whooping cough in Hong Seong Kun, Chung Nam Province during the period from 25th, September to 30th, Oct. 1964. As the result of this study, following conclusions were obtained. (1) In the cases under 16 years of age, the average attack rate showed 70.32 and the highest attack rate in the 2-3 years of age with 161.71. (2) No significant difference was observed between both sexes throughout the age under 16 years old. (3) The cases among 0-5 years of age occupied more than three quarters of the total and the elder age the less patients. (4) The highest pervalence was shown in the group of 2-3 years of age in both male and female with 18.75% and 16.67% respectively. (5) Complete vaccination showed 0.72% infection of pertussis, both complete and incomplete vaccination, 12.32% infection. (6) Among the siblings, seniors were infected prior to juniors with the ratio of more than 6:1 (7) The average secondary attack rate was 23.43% and the highest was shown among 1-5 years of age with 57.43% (8) The case fatality rate under 1 year of age was 3.33% (9) The average period from the catarrhal to convalescent stage was about 64.6 days. (10) Out of total cases, 37.14% were diagnosed at the clinic. (11) The average cost of medical treatment was about 305 Won, and the average number of time for treatment at clinic was 2.85. (12) The average period from the occurance of coughing to the visiting to a clinic was about 8.4 days. (13) The severe complications such as otitis media and convulsion of the total patients showed 5.07%. (14) The incidence of whooping cough was observed from January to October; the highest in March, the next in April and the lowest in October, September and January.
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전력변환 반도체 냉각용 PFC(FC-72) 밀폐형 2상 열사이폰의 열전달 한계에 관한 연구
박용주,홍성은,김철주 대한설비공학회 2002 설비공학 논문집 Vol.14 No.9
In this study, the heat transport limitations of a two-phase closed thermosyphon were investigated. For the test, a two-phase closed thermosyphon ($L_t/: 600 mm,\;L_e:105mm,\;L_a:75mm,\;L_c:420mm,\;D_o:22.2mm,$ container: copper (inner grooved surface), working fluid: PFC ($C_6F_14$) was fabricated with a reservoir that can change the fill charge ratio. The following was imposed as the factors on the heat transport limitations of a two-phase closed thermosyphon. 1) Fill charge ratio of the working fluid. 2) Tilt angle of the longitudinal axis. From tile experimental data, some results were obtained as follows. When the fill charge ratio was relatively small ($\psi$20%), the heat transport limitation occurred about 100W by dry-out limitation. However over 40%, it shelved nearly constant value (500 W) by flooding limitation. The heat transport limitation according to the tilt angle increased smoothly until the tilt angle was $60^{\circ}$,, after then decreased slowly.
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