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김자연,한용희 梨花女子大學校 藥學硏究所 1978 梨花藥學硏究 Vol.- No.18
Carr Fluidity Indices of ZnO, TiO_2, Talc, Zn-stearate, CaCO_3 and Kaolin which are materials of the cosmetic powder were determined by measuring the angle of repose, compressibility, angle of spatula and aggregation respectively. The distribution condition of the components of the marketing cosmetic powders were estimated by comparing the fluidity indices of two samples which are different from amount of the components with the fluidity indices of two marketing samples of a dusting powder and a face powder.
개인보호구(안전모, 안전벨트) 성능 유지를 위한 관리방안에 관한 연구
김자연 대한안전경영과학회 2022 대한안전경영과학회지 Vol.24 No.1
In order to find out the management and sanitation status of protective gear provided at the construction site, a case study and survey were conducted by visiting the site. As a result of the case study, inspection and management, disinfection, and storage of protective equipment were insufficient in both workplaces with less than 50 employees and workplaces with more than 100 employees. As a result of the survey, workers(66.2%), said they did not know how to identify hard hats(67.6.%), how to identify bad hard hats(60.8%), and how to identify bad safety belts (73.0%), even though workers(66.2%) were educated on protective gear, and those in charge of protective gear Non-specified(56.8%), regular inspection of the provided protective equipment was not performed(82.4%), and disinfection was not performed(90.5%). Therefore, as a management plan to maintain the performance of personal protective equipment, educational aspects, regular training on protective equipment, training on how to identify defective protective equipment, management of recording papers, technical aspects, strengthening of standards for placement of dedicated safety managers in small workplaces, participation of workers’ representatives when selecting protective equipment, and selection of protective equipment for workers Providing opportunities, administrative aspects of protective equipment regulation and management, introduction of sanitary and cleanliness system, and selection of personnel in charge of protective equipment management were suggested.
결측되었거나 구간중도절단된 중간사건을 가진 준경쟁적위험 자료에 대한 가산위험모형
김자연,김진흠,Kim, Jayoun,Kim, Jinheum 한국통계학회 2017 응용통계연구 Vol.30 No.4
본 논문에서는 사망과 같은 종말사건의 발생 유무는 알고 있지만 치매 발병과 같은 중간사건이 구간중도절단 되었거나 연구 기간 도중에 추적이 끊겨 결측된 준경쟁적위험 자료에 대해 다중상태모형을 적용하여 모수를 추정하는 방법을 제안하였다. 이를 위해 본 논문에서는 상태 간의 전이강도는 로그정규 프레일티를 랜덤효과로 가진 Lin과 Ying(1994)의 가산위험모형을 따른다고 가정하였다. 다섯 가지 상태를 가진 다중상태모형에서 가능한 여섯 가지 경로별로 조건부우도를 정의하였고, 주변우도를 구하기 위해 조정중요표본추출법을 적용하였으며 반복유사뉴튼 방법으로 최적해를 구하였다. 소표본 모의실험을 통해 모수의 95% 신뢰구간 포함률이 명목값에 얼마나 가까운지 살펴보았으며, 제안한 모형을 Persones $Ag{\acute{e}}es$ Quid (PAQUID) 자료 (Helmer 등, 2001)에 적용하고 그 결과를 해석하였다. We propose a multi-state model to analyze semi-competing risks data with interval-censored or missing intermediate events. This model is an extension of the three states of the illness-death model: healthy, disease, and dead. The 'diseased' state can be considered as the intermediate event. Two more states are added into the illness-death model to incorporate the missing events, which are caused by a loss of follow-up before the end of a study. One of them is a state of the lost-to-follow-up (LTF), and the other is an unobservable state that represents an intermediate event experienced after the occurrence of LTF. Given covariates, we employ the Lin and Ying additive hazards model with log-normal frailty and construct a conditional likelihood to estimate transition intensities between states in the multi-state model. A marginalization of the full likelihood is completed using adaptive importance sampling, and the optimal solution of the regression parameters is achieved through an iterative quasi-Newton algorithm. Simulation studies are performed to investigate the finite-sample performance of the proposed estimation method in terms of empirical coverage probability of true regression parameters. Our proposed method is also illustrated with a dataset adapted from Helmer et al. (2001).
김자연,한용희 이화여자대학교 약학회 1978 梨花藥學會誌 Vol.- No.18
Carr Fluidity Indices of ZnO, TiO_2, Talc, Zn-stearate, CaCO_3 and Kaolin which are materials of the cosmetic powder were determined by measuring the angle of repose, compressibility, angle of spatula and aggregation respectively. The distribution condition of the components of the marketing cosmetic powders were estimated by comparing the fluidity indices of two samples which are different from amount of the components with the fluidity indices of two marketing samples of a dusting powder and a face powder