Influencing Factors that Affect the Biological Monitoring of Workers Exposed to N,N-Dimethylformamide in Textile Coating Factories

정인성,김종환,최상국,배종연,이미영,Chung, In-Sung,Kim, Jong-Ghan,Choi, Sang-Kug,Bae, Jong-Youn,Lee, Mi-Young The Korean Society for Preventive Medicine 2006 예방의학회지 Vol.39 No.2

Objectives : The objective of this study is to assess the factors influencing biological monitoring of textile coating factory workers exposed to N,N-dimethylformamide(DMF). Methods : We studied 35 workers who were occupationally exposed to DMF from 9 textile coating factories. The study was carried out in two phases; summer and winter. While air concentration of DMF, temperature and humidity were assessed in order to monitor the atmospheric conditions, biological monitoring was done to determine the internal dose by analyzing the N-methylformamide(NMF) collected from urine at the beginning and end of the shift. Questionnaires and medical surveillance were also obtained during the two phases. Results : Median air concentrations of DMF in winter and summer were 1.85 ppm and 2.78 ppm respectively. Also the difference between the urinary NMF concentration at the beginning and end of the shift $({\Delta}NMF)$ was always significant in each season (P < 0.001). The correlations between log DMF in air, log end-of-shift urinary NMF (r=0.555, P < 0.001) and log ${\Delta}NMF$ (r = 0.444, P < 0.001) was statistically significant in summer. The temperature, humidity, a shift system and different styles of clothing worn were significantly different during the two phases. In a multivariate analysis, temperature and the concentration of DMF in the air were the main factors influencing biological monitoring of textile coating factory workers. Conclusions : Concerning more comprehensive prevention measures to reduce exposure for those workers occupationally exposed to DMF, dermal exposure conditions such as temperature and humidity together with the air concentration of DMF should be assessed and biological monitoring is necessary to reduce adverse health effects, especially during the summer.

Micronucleus Test of $Scutellariae$ $Radix$ Aqueous Extract in Bone Marrow Cells of Male ICR Mice

정인권,전우현,강수진,구세광,이영준,Chung, In-Kwon,Cheon, Woo-Hyun,Kang, Su-Jin,Ku, Sae-Kwang,Lee, Young-Joon Society of Preventive Korean Medicine 2012 대한예방한의학회지 Vol.16 No.1

Objectives : In this research, the genotoxic effect of $Scutellariae$ $Radix$(SR), the dried roots of $Scutellaria$ $baicalensis$ Georgi has been traditionally used as antipyretic agent, was evaluated using the mouse micronucleus test. Methods : SR aqueous extract(yield = 27.2%) was administered once a day for 2 continuous days by oral gavage to male ICR mice at doses of 2,000, 1,000 and 500 mg/kg. Cyclophosphamide(CPA) 70 mg/kg was used as a known genotoxic agent in a positive control. The appearance of a micronucleus(MN) in polychromatic erythrocyte(PCE) is used as an index for genotoxic potential, and PCE ratio is used as an index of cytotoxicity. Results and Conclusions : Although significant(p<0.01) increase of the number of PCE with one or more nuclei(MNPCE) was detected in CPA treated groups, no significant increases of MNPCE numbers were observed in all three different dosages of SR extracts treated mice with over 0.33 of the individual polychromatic erythrocyte ratio in all mice used in this study. The results obtained indicated that SR extract shows no genotoxicity effects up to 2,000 mg/kg dosing levels - the limit dosage in rodents.

움직임 감지를 위한 가우시안 혼합 모델 기반 전경탐지에서 발생하는 노이즈 처리 방법

정인범(In-Bum Chung),이용빈(Yongbin Lee),최동훈(Dong-Hoon Choi) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11

Detecting movements in a video feed can be done using either conventional computer vision techniques or deep learning. In this study, a foreground detection technique is used for movement detection in order to perform real-time analysis on a fixed camera. Foreground detection requires less computational resource compared to state-of-the-art machine-learning techniques, which makes it more suitable for real-time detection. Additionally, it has the benefit of not requiring the process of data labeling and model training, allowing detection of movements that were not anticipated by the engineer. However, there is a drawback concerning noisy predictions. In order to detect even the smallest changes, a sensitive detector has to be used. Unfortunately, this usually results more noise in detections. In this study, we attempt to find methods to sustain the sensitivity while removing circumstantial noise in the detections to enhance detection accuracy. This study focuses on the main causes of noises and methods to work around them.

천연인디고 색소의 구조분석

정인모 ( In Mo Chung ),이광길 ( Kwang Gill Lee ),성규병 ( Gyou Byung Sung ),김현복 ( Hyun Bok Kim ),남성희 ( Sung Hee Nam ),홍인표 ( In Pyo Hong ) 한국잠사학회 2007 한국잠사곤충학회지 Vol.49 No.1

쪽풀 생잎에서 우려낸 색소 액에 소석회를 첨가한 후 쪽풀 색소의 침전물을 만들어서 냉동 건조시켜 쪽풀 색소를 제조하여, 그 성분을 조사한 결과 다음과 같은 결론을 얻었다. 1. UV 분광광도, TLC 정성 분석, HPLC 측정 결과 쪽분말 용액의 2개 bend가 나타났으며, 적색색소대인 540nm 와 청색 색소대인 620nm가 존재함을 알 수 있었다. 2. FT-IR 분석으로부터 1627cm-1에서 채, 320~3300 cm-1에서 NH의 흡수대가 나타나고, 적색 및 청색 색소의 IR spectrum이 일치하였으며, 3. EI-mass 분석 결과 청색과 적색 색소의 fragment 이온의 m/z가 일치하고, 1H_MNR 분석결과로부터 두 색소는 이성질체임을 알 수 있었고, 4. 쪽 염료 성분 함량을 조사한 결과 인디고 색소 4.06%와 인디루빈 1.06%이었다. Natural indigo colorants were prepared by extraction of Polygonum tinctorium which was harvested just in the blooming season (in the late of July). The components were analyzed by TLC and HPLC, and its structures were analyzed by FT-IR, El-mass. The results obtained are summarized as follows; The natural indigo powder was dissolved in DMSO and developed in eluent, CHCI3/CH3CN (8.5: 1.5 v/v) by means of TLC for its quality analysis. It was segregated into indirubin as a red colour and indigo as a blue colour. In case of HPLC analysis,. FT-IR spectrum of indirubin showed a peak for NH residue between 3200 and 3300 cm-1. ``H-NMR spectrum for indigo displayed AA``BB`` spin system caused by indole structure between 6.5 and 7.7 ppm of H4, 5,6 and 7, and -NH proton for indirubin showed an singlet between 10.88 and 11.0 ppm. EI-mass spectrum of indigo and indirubin both disclosed their molecular size as 262 and it implies that these two substances are isomer.

초등학교의 ‘일반학교’와 ‘혁신학교’의 사회자본 연구

정인아(In-A Chung),이미선(Mee-Seon Lee) 전북대학교 교육문제연구소 2021 교육문제연구 Vol.27 No.2

본 연구에서는 일반학교와 혁신학교 학생의 학교 내 사회자본을 탐구하였다. 구체적으로, 일반학교와 혁신학교에 재학 중인 초등학생들의 배경특성에 따라 그 학생들이 지각한 학교 내 사회자본이 어떻게 다른지, 그리고 일반학교와 혁신학교 간에 학생들의 학교 내 사회자본의 수준에서 어떠한 차이가 있는지를 비교해보고자 한다. 본 연구를 위해 전라북도 소재 초등학교 중 혁신학교와 일반학교 5, 6학년 학생들을 대상으로 설문조사를 실시하였다. 본 연구의 결과는 다음과 같다. 첫째, 일반학교 학생의 지역에 따른 학교 내 사회자본의 정도를 비교해보면, 사회자본 정도에서 전주지역 학생은 군산 지역 학생보다 높았으며, 익산 지역 학생과 기타 시 지역 학생은 군산지역 학생보다 높았다. 둘째, 혁신학교 학생의 지역에 따른 학교 내 사회자본 정도를 비교해보면, 사회자본 정도에서 전주, 익산, 군산 지역 학생은 기타 시 지역 학생보다 더 높은 것으로 나타났다. 셋째, 혁신학교가 일반학교보다 학생들의 학교 내 사회자본이 높으리라는 기대와는 다르게, 혁신학교가 일반학교보다 사회자본이 높지 않았으며, 의미있는 차이가 없었다. 오히려 신뢰 영역에서는 일반학교가 혁신학교보다 더 높은 것으로 나타났다. 이러한 연구결과에 비추어 볼 때, 일반학교에 비해 혁신학교가 학생들의 사회자본 형성과 더 밀접히 연관되어 있는 것은 아니라는 결론을 내릴 수 있다. The purpose of this study is to examine the level of social capital of the general school and the innovative school. The results of this study are as follows. First, as a result of comparing the level of social capital according to gender and academic performance in the general schools, there was no significant difference. However, there was a significant difference in the level of social capital by region. Second, as a result of comparing the level of social capital according to gender and academic performance in the innovative schools, there was no significant difference except for the ‘norms,’ one component of social capital. However, there was a significant difference in the level of social capital by region. Third, there was no significant difference in the level of social capital between the general schools and the innovative schools except for ‘trust.’ The contribution of innovative schools to the formation of learning community is doubtful, given the higher the level of trust in general schools.

밤나무 시비시험 (Ⅱ) - 일조량부족과 (日照量不足) MgO 의 시비효과 -

정인구,강신우,이명선 ( In Koo Chung,Sin Woo Kang,Meong Sun Lee ) 한국산림과학회 1982 한국산림과학회지 Vol.58 No.1

During the two-years(1979 to 1980) fertilization trial on 4-year-old chestnut tree plantations. total insolation was diminished in 1980 because of unseasonable weather. In every fertilization treatment plot, especially in the NPK-fertilized plot with mannesium, growth of trees and yield of chestnuts have been increased significantly. The results obtained are as follows: 1) The growth in the NPK-fertilized plot with boron and magnesium was 20 percent higher than in plots fertilized with NPK alone. 2) Although there was some frost damage to trees on November 14, 1979, the 1979 weather was otherwise normal and daily insolation averaged 7 hours from June through september, The 1979 fertilization indices for chesnut yield were 167 for NPK with boron and 207 for NPK with magnesium, as compared with the base index of 100 for NPK alone. 3) In 1980, the second year of the fertilization trial, unseasonable weather decreased the average daily insolation from June through September to 3.8 hours. Under such conditions, the fertilization indices for chestnut yield were 620 for NPK with boron and 741 for NPK with magnesium, and Boron, as compared to the base index of 100 for NPK alone; i.e. the yields of plots treated with NPK and magnesium were 21 percent higher than for plots with NPK and boron and 7 times the yields for plots with NPK alone, But in the trial plot of NPK, yield of chestnut in 1980 decreased compared with 1979, 4) All test plots had natural magnesium levels lower than 0.8me/100gr., and the treatments with NPK and magnesium would have been less apparent on soils with higher magnesium level. The spectacular effects of treatment with NPK and magnesium during periods of low insolation may result from increased chlorophyll production and corresponding increases in active carbon assimilation, which should play an important role in carbohydrate formation.

Do3 CuZnAl 합금에 있어서의 역형상기억효과

정인상,이인철,박정식,이순린 ( In Sang Chung,In Chul Lee,Jung Sig Park,Soon Lin Lee ) 한국열처리공학회 1990 熱處理工學會誌 Vol.3 No.2

Since the reverse shape memory effect(RSME) was reported in a CuZnAl alloy, further study has been done on the mechanism of this phenomenon and reported that it occurs by the bainitic transformation. But the present authors revealed in the previous work that the RSME in a B2 CuZnAl alloy is not caused by the shear process involved in the bainitic transformation and also that the RSME takes place as the remaining α`₂phase, which is two-step transformed strain induced martensite, is newly transformed into α phase. In order to provide further evidence in supporting the facts, thus, more detailed investigations have been carried out in a DO₃CuZnAl alloy.

한국산 다슬기(Semisulcospira spp.)의 흡충류 유미유충 감염실태 및 농약의 잔류성에 관한 조사연구

임승균,정인실,정평림,이근태,Im, Seung-Kyun,Joung, In-Sil,Chung, Pyung-Rim,Lee, Keun-Tae 한국패류학회 1986 The Korean Journal of Malacology Vol.2 No.1

One of the most medically important snail species of Korea is Semisulcospira spp., a member of the freshwater prosobranch family pleuroceridae. The parasites that these snails transmit to humans are mainly Paragonimus westermani and Metagonimus yokogawoi. On the other hand, Semisulcospira snails are edible as a foodstuff in Korea. The present study was first aimed to detect out residual pesticides in the snails collected at the endemic and non-endemic areas of paragonimiasis in Korea and to make relationship to the detectability of larval trematodes shed from the snails. In addition, water specimens from the habitats where the snails were collected were sampled and analysed to elucidate environmental conditions of the habitats. This malaco-ecological survey was done at 7 endemic and 3 non-endemic areas of paragonimiasis for about more than 2 years, May, 1984 through October, 1986. All the water smaples both from the endemic and non-endemic areas of paragonimiasis showed normal ranges of the criteria of upper freshwater streams, with lower B.O.D. (0.4~2.0 ppm) and higher D.O. values (9.5~11.0 ppm) than those in the large river systems Infection rate of digenetic trematodes in total snails collected was 6.7%, but no Paragonimus cercaria was detected out at all even in the endemic areas of paragonimiasis. The ecological factors affecting Paragonimus larvae in the snails were also discussed. A total of 9 chlorinated hydrocarbon pesticieds was targeted to detect out from the tissues of snails. Out of 9 pesticides, aldrin, beta-BHC, p, p-DDT, dieldrin, DDE, lindane, heptachlor and heptachlor epoxide were eluted from the snails. The highest levels of the pesticides were mostly detected out in the snails collected from the Donghae-Chun area of Haman and the Kangwha area of Kyongki-Do, where the lowest infection rates of trematode cercariae (0~0.5%) were revealed. The possibilities that the residual pesticides in the freshwater animals including Semisulcospira snails might be transferable to humans were also discussed.

치과기공사국가시험 문항개발기준안연구

이덕혜,정인성,한창식,Lee, Duck-Hye,Chung, In-Sung,Han, Chang-Sik 대한치과기공학회 2002 대한치과기공학회지 Vol.23 No.2

This research was preformed for the purpose of preparing the items of standard model of the national dental technician test base on the duty analysis of the dental technician. The results of the duty analysis for the dental technician follows. 1. The dental technician is a profession to make the oral function smooth through the dental supplement and equipment in a scientific method and the skilled technique. 2. The duty of the dental technician are determined as A. preparation for manufacture B. manufacture C. management of the place of the dental technology D. self-development. A. The field of "the preparation for manufacture" are determined as 1. to confirm work authorization 2. To confirm the working model, B. The field of "In manufacture" are determined as 1. to manufacture the temporary crown 2. to manufacture the inlay and crown & bridge prosthesis 3. to manufacture the porcelain fused metal crown prosthesis 4. to manufacture the all ceramic crown prosthesis 5. to manufacture the temporary denture prosthesis 6. to manufacture the partial denture prosthesis 7. to manufacture the complete denture prosthesis 8. to manufacture the attachment prosthesis 9. to manufacture implant prosthesis 10. to manufacture the removable orthodontic device, 11. to manufacture the fixed orthodontic device, 12. to manufacture the orthodontic study cast C. The field of "in management of the dental lab." are determined as 1. management 2. to control the dental lab. D. The field of "In the self-development" are determined as 1. to improve the professionalism 2. self-control. 3. The developing items selected under the duty evaluation of the dental technician are l7s in the manufacture preparation, 1,011s in the manufacture, 7s in the management for the dental technology, 5s in self-development, and in all together 1,040s

벤치발파에서 파쇄도 예측을 위한 암반조건 분석

최용근(Yong-Kun Choi),이정인(Chung-In Lee),이정상(Jeong-Sang Lee),김장순(Jang-Soon Kim) 한국암반공학회 2004 터널과지하공간 Vol.14 No.5

벤치발파에서 암석 파쇄도 예측은 생산계획을 수립하는 데 있어서 가장 중요한 요소 중의 하나이다. Kuz-Ram 모델은 지금까지 제안된 암석 파쇄도 예측 모델 중 가창 우수한 것으로 평가받고 있으나, 이 모델의 평가항목을 구성하고 있는 절리조건, 암석강도, 밀도, 사용폭약의 성능과 저항선, 공간격 등의 요소들은 그 값을 선정하는 과정에서 주관적인 요소가 개입되거나 정의가 모호한 요소를 포함하고 있다. 이 연구에서는 Kuz-Ram 모델을 구성하는 여러 평가항목의 값을 선정하는 과정에서 주관적이거나 모호한 요소를 제거하는 방법에 대해 검토하였으며, 예측값을 현장조사 결과와 비교하여 적용성을 검토하였다. Kuz-Ram 모델은 비교적 정확한 예측결과를 보였으나, 현지암반 조건을 충분히 반영하지 못하여 개선이 필요한 것으로 판단되었다. Prediction of fragmentation in bench blasting is one of the most important factors to establish the production plan. It is widely accepted that fragmentation could be accurately predicted using the Kuz-Ram model in bench blasting. Nevertheless, the model has an ambiguous or subjective aspect in evaluating the model parameters such as joint condition, rock strength, density, burden, explosive strength and spacing. This study proposes a new method to evaluate the parameters of Kuz-Ram model, and the predicted mean fragment sizes using the proposed method are examined by comparing the measured sizes in the field. The results show that the predictions using Kuz-Ram model with the proposed method coincide with field measurements, but Kuz-Ram model does not reflect the in-situ rock condition and hence needs to be improved.