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실내 $^{222}Rn$과 $^{222}Rn$ 딸핵종에 의한 피폭선량 해석연구
전재식,채하석,이철영,조혁,하정우,Jun, Jae-Shik,Chai, Ha-Seok,Yi, Chul-Young,Cho, Hyuck,Ha, Chung-Woo 대한방사선방어학회 1995 방사선방어학회지 Vol.20 No.1
활성탄 캐니스터법과 알파분광분석 법을 이용하여 실내 공기중의 $^{222}Rn$ 및 그 딸핵종의 농도와 $^{222}Rn$과 그 딸핵종 사이의 평형인자를 동시에 측정하였다. 실내 체재율을 0.8, 일반인과 작업종사자의 호흡율을 각각 $0.75m^3\;h^{-1}$와 $1.2m^3\;h^{-1}$로 가정하고, 실내 공기중의 $^{222}Rn$과 그 딸핵종의 흡입에 의한 부위별 폐선량을 세가지 모형 즉, Jacobi-Eisfeld, James-Birchall 및 ICRP 모형으로 평가하고 연간총유효선량을 평가하였다. Assesment of dose equivalent given by inhaled $^{222}Rn$ and its progeny has been carried out based on the concentrations of $^{222}Rn$ and its daughters in indoor air, and equilibrium factor between them measured by charcoal canister method and alpha spectrometry. Assuming the occupancy factor to be 0.8, and breathing rate to be $0.75m^3\;h^{-1}$ for public and $1.2m^3\;h^{-1}$ for occupational exposure, respectively, the regional lung dose 대valent and the resulting annual effective dose equivalent due to the inhalation of $^{222}Rn$ and its daughters in indoor air were evaluated by use of three different lung models, namely, Jacobi-Eisfeld, James-Birchall and ICRP model.
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전재식 한국직업능력개발원 2002 직업능력개발연구 Vol.5 No.1
The purpose of this study is to analyze the factors determining youth employment by examining groups varying in academic achievement and in the major field of study, ultimately to lay a foundation for effective youth employment policy The primary data used in this research is the results of auxiliary survey conducted on youth workforce as part of tile Korean Labor and Income Panel Survey. 3,302 young people of ages between 15 to 29 as of 1 May 2000 participated in the survey, and 1,577 respondents were selected as sample for this research. Different approaches were taken to identify the factors affecting youth employment. first, it was found that the results varied when the sample group was analyzed as a whole and when it was divided into smaller groups by academic achievement and the major field of study. Second, analysis of the sample group divided into different categories produced variation in the sign, size and significance of the variables. The transition of youth from school to work is more difficult than ever as the labor market undergoes dramatic change. Moreover, demand for entry level labor force is diminishing as employers look for more experienced workers. The government policy on youth employment should be based on a concrete assessment of the youth labor market and its changes if it is to be efficient and effective.
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전재식,김재경 한국미생물·생명공학회 2018 한국미생물·생명공학회지 Vol.46 No.4
Ureaplasma urealyticum (UU) infection can spread rapidly across populations and is associated with cervical intraepithelial neoplasms, human papillomavirus infections, and newborn mortality. This study aimed to provide information that could be used to protect public health and decrease the incidence and transmission of sexually transmitted infections (STIs), particularly among childbearing women. We examined the epidemiology of UU infection in Cheonan, South Korea. During 2006−2017, 4,050 specimens were submitted for STI screening using a multiplex polymerase chain reaction (PCR) assay. Data were analyzed for UU infection cases using the R statistical program and categorical data were analyzed using the chi-square test, and p-values <0.05 were considered statistically significant. Positive PCR results were shown in 17.8% of the total specimens, in 9.0% of men, and in 18.7% of women. Individuals in their teenaged years and individuals aged 20−29 years accounted for the largest proportions of UU-positive specimens. Although Mycoplasma hominis was the most prevalent bacterium in 2006, it was superseded by UU in 2017. Of the 870 UUpositive specimens, 50.1%, 33.1%, 13.4%, and 2.8% had single, double, triple, and quadruple infection, respectively. UU was most common among Korean individuals aged 20−29 years, indicating a high risk of maternal- to-infant transmission that should be addressed through rapid diagnosis, treatment, and management.
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전재식,김종완,김재경 한국미생물·생명공학회 2018 한국미생물·생명공학회지 Vol.46 No.2
Human papillomavirus (HPV) plays a critical role in the development of cervical carcinoma. This study analyzed the efficiency of multiplex real-time PCR in detecting and identifying HPV genotypes in samples from women who visited a Korean hospital for checkups. Cervical swab specimens were obtained from women who attended a checkup at the Health Improvement Center of Hospital in Dankook University Cheonan, South Korea and were referred for an HPV genotyping test between January and September 2014. A total of 1703 cervical swab specimens were collected consecutively during this period. PCR results were compared with those of the traditional cytological assay for the same population. Among the 1,703 specimens, 19.91% were HPV positive, of which 14.50% indicated a single infection and 5.40% indicated multiple infections. However, cytology identified only 2.52% of positive cases, including 1.23% cases of atypical squamous cells of undetermined significance, 1% of low grade squamous intra-epithelial lesion, and 0.29% of high grade squamous intra-epithelial lesion. The rate of high-risk and low-risk HPV in the abnormal cytology group was 48 and 23, respectively, and 274 and 136 in the normal group, respectively. HPV types 56, 52, 43 were the most prevalent in that order. Our results confirm the efficiency of the HPV DNA assay for the detection of 28 different HPV genotypes with reasonable sensitivity. A screening strategy that comprises the HPV DNA assay and cytology would help overcome the low sensitivity of a cytological diagnosis.
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전재식,김은숙,유승성,오석률,최한영,Jeon, Jae-Sik,Kim, Eun-Sook,Yoo, Seung-Sung,Oh, Seok-Ryul,Choi, Han-Young 한국환경보건학회 2013 한국환경보건학회지 Vol.39 No.5
Objective: This study was carried out for the purpose of identifying major substances contributing to the production of odor and evaluating the characteristic of odors. Methods: Complex odor and 17 odorous compounds were measured at 18 waste transfer stations located in Seoul. Results: The dilution ratio value of complex odor ranged from 4 to 30 times in the boundary layer of 18 waste transfer stations. At 6 measurement points among the 18 waste transfer stations, the dilution ratio values exceeded standards (15 times). When the results were evaluated in terms of their contribution to the formation of malodor, the patterns indicated that the highest concentration values in the residential waste disposal process were of i-valeraldehyde and acetaldehyde, while butyraldehyde and acetaldehyde accounted for a large proportion of odorous compounds from the waste recycling process. Conclusions: It was found that butyraldehyde and acetaldehyde were the primary compounds released from the food waste disposal process. Overall, aldehyde compounds were the greatest contributor to detectable odor intensity emitted at the waste transfer stations.
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전재식,박재민 한국직업능력개발원 2006 직업능력개발연구 Vol.9 No.2
본 논문은 노동시장 성과지표로서 임금에 주목하여 이공계 인력의 임금격차를 추정하고, 나아가 전공일치, 학교교육의 질, 대학수준이 이공계 임금에 미치는 효과 등에 대해 실증분석을 시도하였다. 추정 결과, 사회계열이나 교육계열, 의약계열보다 상대적으로 낮은 임금수준이 이공계 기피현상의 주요 요인으로 작용함을 알 수 있었다. 그러나 전공과 일치하는 직업으로 이행하고, 대학교육의 질을 개선시키며, 교육투자의 선택과 집중을 통해 우수한 이공계 인력을 양성할 경우 열악한 임금수준은 얼마든지 개선시킬 소지가 충분함을 본 연구에서는 주장하고 있다. 이는 적어도 열악한 임금수준으로 인하여 발생하는 이공계 기피현상은 이공계 교육의 질적 제고를 통해 상당 정도 해결할 수 있음을 시사하는 것이다. This paper attempts to find out the wagee differentials of science and engineering graduates. Using the data from the Korean Survey of University Graduate 2005 and Statistical Yearbook of Education, we find that the average wage levels of science and engineering graduates are lower than those of graduates in social sciences, education, and medical sciences and pharmacy. This is one of the major reasons for the problem of students shunning science and engineering. But we argue that this problem can be overcome with higher wage levels promoted through moving to jobs matching university majors, improvement of university education quality, and 'select and concentrate strategy' in university investment. That is, we can solve the problem of students shunning science and engineering by improving the level of education quality of science and engineering programs.
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