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1980년(年) 센서스 인구(人口)의 수정(修正) 및 1975~1980 지역별(地域別) 순이동자(純移動者) 추계(推計)
정영일 ( Young Ii Chung ),김유경 ( Yu Kyoung Kim ) 한국보건사회연구원 1985 保健社會硏究 Vol.5 No.1
The main purposes of this study are the estimates of age distribution by single year and sex for the entire population, and net-migrants during 1975~80 by province using 1980 census data. So far, the digit preference in reporting age is found to be almost negligible in all censuses from 1925 to 1980 as observed from the Myers` Index. While the joint scores rise to around 25, which are likely to indicate relatively low accuracy in the statement of age and sex. The underenumeration was concentrated in the age group 0~4, according to the PES report. In this study an attempt has been made to estimate adjusted population for the 1980 Census; Total population was adjusted into account about 2.5 percent of net under enumeration in the 1980 Census of entire nation following the data from the communique of Korea Government, single year population for age 0 to 4 was estimated by using fertility and mortality rate during 1975~80, and other single year population was estimated through interpolation from the adjusted population of quinquennial age group by using the computer program for graduation. Another attempt has been made to estimate net-migrants by province during 1975~80. Net-migrants by province was estimated by average of both forward and reverse survival ratio method. Especially, the net-migrants for Seoul Metropolitan City from the above method was compared with the net-migrants from residence five years ago. The comparison of net-migrants from the Census and indirect estimates shows somewhat under-enumeration in case of 1980 Census report.
정영일(Young Il Jeong),문성표(Seong Pyo Mun),장정환(Jeong Hwan Chang),김권천(Kweon Cheon Kim),민영돈(Young Don Min),김성환(Seong Hwan Kim),조현진(Hyun Jin Cho),김경종(Kyung Jong Kim),류소연(So Yeon Ryu) 대한외과학회 2008 Annals of Surgical Treatment and Research(ASRT) Vol.75 No.3
Purpose: Surgical site infection (SSI) is the most common nosocomial infection in surgical patients, and this accounts for 38% of all patients with nosocomial infections. Despite the advances in techniques and knowledge to prevent infection, SSI remains a significant source of postoperative morbidity and mortality, and it results in a prolonged hospital stay and increased cost. This study aims to assess the incidence of SSI and to identify the risk factors associated with SSI for patients who undergo abdominal operation. Methods: The data on 347 abdominal operations that were done under general anesthesia from 1 August 2005 to 31 July 2006 was collected and reviewed. Results: The overall incidence of SSI was 4.9%. Comorbidity was the independent risk factor for the development of SSI (P=0.011). The development of SSI was related with the American Society of Anesthesiologists (ASA) preoperative assessment score (P=0.025). The duration of the operation had a statistically significant association with an increased risk of SSI on univariate analysis. The wound classification was not associated with SSI. Staphylococcus aureus was the most frequently isolated organism, and all of the cases were methcillin-resistant Staphylococcus aureus. Conclusion: This study demonstrate that comorbidity is a significant independent risk factor for SSI.
고출력 무전극램프의 가스압 및 아말감종류에 따른 특성분석 및 최적화에 관한 연구
정영일(Young-Il Chung),정대철(Dae-Chul Jung),김용갑(Yong-Kab Kim),박대희(Dae-Hee Park) 한국정보전자통신기술학회 2017 한국정보전자통신기술학회논문지 Vol.10 No.1
현재는 도로조명의 경우 기존 메탈할라이드 램프 400W이하로 설치되어 있어 에너지절약형 조명으로 대체가 이루어지고 있으며, 무전극 램프는 터널조명과 고천정조명 적용분야를 타겟으로 더욱 활발한 교체가 이루어질 것으로 예상된다. 따라서 추가적으로 고효율, 고출력 무전극 램프 시스템 개발이 필요한 상황이다. 본 연구에서는 고출력 무전극 램프의 설계 및 제작을 진행하여 가스종류 및 가스압에 따른 비교 분석, 아말감 종류에 따른 특성 분석 등을 통한 무전극 램프 최적화를 진행하였다. 현재 고출력 무전극 램프 방전관 및 페라이트코어에 맞는 가스압 300~350[mmHg] 사이로 최적화 하였다. 인듐(In) 아말감을 적용한 무전극 램프로 점등회로 매칭을 완료하여 250W(정격±10%)로 정격소비전력으로 최적화를 완료하였다. Currently, road lightings are installed with less than 400W of existing metal halide lamps. These road lightings are being replaced by energy-saving lightings. Induction lamps are expected to be more actively replaced with targets for tunnel lighting and high ceiling lighting. Therefore, it is necessary to develop high efficiency, high power induction lamps system. In this study, the gas type & pressure, amalgam type were designed for the high power of the induction lamps. And induction lamp system was optimized through electrical, optical characteristics analysis. It is optimized to the gas pressure 300~350 [mmHg] for the discharge tube of high power induction lamp and ferrite core. The driving circuit matching was completed with a induction lamp using indium amalgam. The rated power consumption of the induction lamp was optimized with 250 W (rated ± 10%).
고출력 무전극램프의 점등회로 설계를 통한 특성분석 및 최적화에 관한 연구
정영일(Young-Il Chung),정대철(Dae-Chul Jung),박대희(Dae-Hee Park),김용갑(Yong-Kab Kim) 한국정보전자통신기술학회 2017 한국정보전자통신기술학회논문지 Vol.10 No.1
본 논문에서는 고출력 무전극 램프 시스템 개발에서 램프 내에 가스종류, 혼합비, 압력과 방전관 사이즈, 아말감 종류 및 혼합비, 페라이트코어의 특성등의 최적화를 통한 램프 설계 부분을 연구하였다. 또한 구동방식에 따른 점등회로의 역율 및 효율개선, 파형이나 인가 주파수에 따른 특성 분석을 통한 점등회로설계 부분 등을 고려하였으며, 최종적으로 주변 환경을 고려 무전극 등기구 설계를 수행 하였다. 고출력 무전극 램프용 점등회로의 설계를 통한 특성분석을 진행하여 개선 보완을 통하여 효울을 향상 시켰으며 점등회로의 구동주파수에 따른 무전극 램프의 광학적 특성 및 시스템 영향을 확인한 결과, 7~10℃ 정도 낮은 특성의 135kHz로 구동하는 점등회로를 최적화하였다. 실험적으로 Peak Noise 발생으로 인한 FET(Q3,Q4) demage 현상을 개선하였다. 최종적으로 무전극램프용 점등회로 최종 설계도을 통해 약 2~3배 이상의 수명을 확보함으로써 안정기의 신뢰성 및 무전극 램프 시스템의 효율이 높음을 알 수 있었다. In this paper, we implemented for the development of a high output induction lamp system, which lamp design is optimized by gas type, mixing ratio, pressure and discharge tube size, amalgam type and mixing ratio, and characteristics of ferrite core in the lamp. It’s the circuit design by improving the power factor and efficiency according to the driving method, which has analyzing the characteristics according to the waveform and frequency. Finally, luminaries design part for applying the optimal lighting system considering the surrounding environment, the characteristics of the lighting circuit for electrodeless lamp has analyzed and the improvement has been proceeded. In conclusion, the driving frequency has optimized at 135kHz with degrading 7~10℃ based on the results of the optical characteristics of the induction lamp on peak noise FET(Q3,Q4) damage.