초지 조건이 광투과 주사법의 그레이 값에 미치는 영향

조용민 ( Yong Min Cho ),안원영 ( Won Yung Ahn ) 한국공업화학회 2002 공업화학 Vol.13 No.8

종이의 광투과 시 투과된 광의 명암도는 지역 광학밀도와 평량에 따라 다르다. 이러한 특성을 활용하여 화상 히스토그램에 의한 진폭의 중간값인 그레이 값(gray level)을 측정하여 화상분석법으로 종이의 물성을 간접 평가가 가능할 것으로 판단된다. 따라서 본 본문에서는 화상 입력장치인 광투과 주사기를 이용하여 관계습도 65±2%, 온도 20±2 ℃에서 조습한 종이 시험편을 주사하여 화상처리로 얻은 그레이 값과 종이의 평량, 탈수 전 체류시간, 고해도, 밀도 및 압체압력과의 관계를 구명하였다. 광투과 주사 시험용 수초지는 침엽수 미표백 크라프트펄프(SwUKP)와 침엽수 표백 크라프트펄프 (SwBKP)를 20, 25, 30, 35와 40 ˚SR로 고해하고, 초지 시 탈수 전 체류시간(retention time)을 0, 30, 60과 90 sec로, 그리고 평량을 30, 45, 60, 75, 90, 105와 120 g/㎡로 각각 제조하였다. SwUKP와 SwBKP의 고해도 및 체류시간과 평량에 관계없이 수초지의 그레이 값은 SwBKP 수초지가 SwUKP 수초지보다 더 높았다. 그리고 수초지의 평량이 증가할수록 그레이 값은 직선 혹은 지수적으로 감소하였다. 또한 동일평량 수초지의 경우, 고해도가 증가 할수록 그레이 값이 감소하고 체류시간이 늘어남에 따라 그레이 값이 증가하는 경향을 나타냈다. 이는 수초지에 광투과 주사된 광의 명암도 차이가 작기 때문으로 판단되어진다. On the basis of the gray level derived from mean amplitude in distribution of level amplitude being dominated by optically transmitted local light intensity and the basis weight of the paper by light transmission scanner, the image analysis on gray level for handsheets conditioned in humidity chamer with RH 652% at 20±2 ℃ was examined. This effort was to elucidate the relationship between the gray level and the properties of basis weight, degree of beating, retention time, density and press pressure of handsheets. Handsheets of SwUKP and SwBKP for scanning light transmission were prepared at beating degree of 20, 25, 30, 35 and 40; SR, retention time of 0, 30, 60 and 90 seconds; and basis weight of 30, 45, 60, 75, 90, 105 and 120 g/㎡. Light transmission image was closely related to gray level and basis weight. Gray level of SwUKP and SwBKP handsheets decreased in a linearly or an exponentially with increasing basis weight, and the level of SwUKP handsheets was higher than that of SwBKP. On the same basis weight of both SwUKP and SwBKP handsheets, high beating degree resulted low gray level of handsheets. However, the level increased with increasing retention time due to the no clear difference in transmitted intensity on the handsheets.

화학물질 유해성에 대한 작업자와 관리자들의 인식

조용민 ( Yong Min Cho ),김희정 ( Hee Jung Kim ),최재욱 ( Jae Wook Choi ) 한국산업위생학회 2012 한국산업보건학회지 Vol.22 No.4

Objectives: In chemical hazard communication, information receiver`s perception is a important factor, but the study on the perception was few. Therefore, this study evaluated the perception of managers and workers group about chemical hazard communication by chemical hazard communication tools that were being used in fields. Methods: 91 managers and 238 workers were surveyed in two companies where use chemicals. All subjects were asked about the comprehensibility and perception for MSDS and GHS Pictograms being used in their workplaces through faceto- face interviews. Results: Most of the respondents knew MSDS, and more than half of the respondents had used MSDS once or more per year. The level of use to find the information on chemicals with MSDS was higher in the managers in comparison with workers. Also, the managers could understand and find the information on MSDS easier(p < 0.05). In the question asking the meaning of GHS Pictograms, the managers responded more correctly, as well(p < 0.05). 86.8% of the managers and 62.6% of the workers were conscious of the possible health hazards of chemicals that they could be exposed at work. However, among the respondents conscious of the health hazards, only less than 70% were well aware of the contents of the health hazards correctly. Conclusions: In chemical hazard communication, it is very important to evaluate whether information receiver have proper and correct knowledge and perception or not and actions based on the evaluations as well as provide correct information.

환경보건 취약지역에 거주하는 저소득 집단의 카드뮴 노출과 신장질환 영향

조용민(Yong Min Cho),진호현(Hohyun Jin),강지윤(Jiyun Kang),김차훈(Chahun Kim),한다희(Dahee Han),김수현(Su Hyeon Kim),한서희(Seohui Han),홍영습(Young-Seoub Hong),김기태(Ki-Tae Kim) 한국환경보건학회 2023 한국환경보건학회지 Vol.49 No.1

Background: Few studies have assessed exposure to chemicals in the context of environmental vulnerability with a focus on exposure among populations living in certain geographical areas. Objectives: This study aimed to investigate cadmium exposure levels and kidney damage indices in environmentally and socioeconomically vulnerable populations, with further subgrouping according to economic status. Methods: Four areas were selected to represent geographical vulnerability (two environmentally vulnerable populations and two socioeconomically vulnerable populations). Among them, population groups with lower socioeconomic status (SES) were separately classified. Urinary cadmium (UCd), beta2-microglobulin (β2-MG), and N-acetyl-β-D-glucosaminidase (NAG) levels were analyzed in samples from 245 residents of these four areas. Results: Geometric means of concentrations of UCd (0.97~2.02 μg/g creatinine) in all selected populations (N, 245; mean age, 67.8~70.9 years old) were higher than the national reference values (0.39 for adults and 0.78 μg/g creatinine for people in their 60s). Participants with a lower SES had higher UCd and NAG concentrations than did non-low SES participants. In the lower SES group, there was a significant association between UCd and NAG concentrations; however, there was no such correlation in the non-low SES group. Conclusions: Consistent with the findings of previous studies evaluating chemical exposure and associated health effects in specific populations, the findings of this study suggest that individuals with a low SES may be more vulnerable to exposure and related health effects.

조직접착제가 가토 피부창상 치유과정에 미치는 영향에 관한 실험적 연구

조용민(Yong Min Cho),전영환(Young Whan Jun),민승기(Seung Ki Min),김수남(Sao Nam Kim) 대한구강악안면외과학회 1993 대한구강악안면외과학회지 Vol.19 No.2

This experimental study was designed to investigate the wound healing process treated with fibrin adhesive is the dorsum of 12 rabbits. Fibrin adhesive which acts on the final phase of blood coagulation in wound healing process have increasingly been use and applied to the free skin grafting wounds and incisional surgical wounds to compare both conventional wound cares. In each experimental groups were sacrified at 1, 2, 3, 5, 7, 14days postoperatively and specimens have made as a usual methods. The results were as follows: 1. Initial hemorrhagic coagulation was prominent in the experimental groups and degree of inflammatory cell infiltrations, however, was marked as even in each groups. 2. Early fibroblast and new capillary proliferation were incorporated intensely with wound sites in the experimental groups. 3. By applying the tissue adhesive to wound sites, the initial healing process for closing in grafting operation was faster than the incisional surgical wound.

히알루론산이 골 형성에 미치는 영향에 관한 실험적 연구

조용민(Yong-Min Cho),민승기(Seung-Ki Min),김수남(Soo-Nam Kim),유용욱(Yong-Ouk You) 대한구강악안면외과학회 2002 대한구강악안면외과학회지 Vol.28 No.3

Hyaluronic acid (HA) is an almost essential component of extracellular matrices. Early in embryogenesis mesenchymal cells migrate, proliferate and differentiate, in part, because of the influence of HA. Since the features of embryogenesis are revisited during wound repair, including bone fracture repair, this study was initiated to evaluate whether HA has an effect on calcification and bone formation in an in vitro system of osteogenesis. Mouse calvaria Pre-osteoblast (MC3T3-E1) cells were cultured in α-MEM medium with microorganism-derivative hyaluronic acid that was produced by Strep. zooepidemicus which of molecular weight was 3 million units. The dosages were categorized in each 0.5, 1.0 and 2.0 mg/ml concentration experimental groups. After 2 and 4 days cultures in expeirmental and control groups, the tendency of cell proliferation, MTT assay, protein synthesis ability, collagen synthesis and alkaline phosphatase activity were analysed and bone nodule formation capacity were measured with Alizarin Red S stain after 29 days cultures. The cell proliferation was increased in time, especially the group of 0.5 and 1.0 mg/ml concentration of HA were showed prominent cell proliferation. After 2 and 4 days culture, experimental groups in general were greater cell activity in MTT assay. The protein synthesis was increased in all experimental groups compared to control group, especially most prominent in 1.0 mg/ml concentration group. The collagen synthesis capacity were increased in HA experimental groups, especially prominent in 1.0 mg/ml group and the activity of alkaline phosphatase were increased, especially also prominent in 1.0 mg/ml group, compared to control group. Above these, the activity of mouse carvarial pre-osteoblast cells was showed greater bone osteogenesis activity in all applied HA experimental group, especially group of 1.0 mg/ml concentration of HA.

일부 폐금속광산 주변지역 중금속 노출요인이 지역주민 체내 중금속농도 및 생체지표에 미치는 영향

김상후,조용민,최승현,김해준,최재욱,Kim, Sang-Hoo,Cho, Yong-Min,Choi, Seung-Hyun,Kim, Hae-Joon,Choi, Jae-Wook 대한예방의학회 2011 Journal of Preventive Medicine and Public Health Vol.44 No.1

Objectives: This study assessed the factors that have an influence on the residents exposed to heavy metals, and we utilized the findings to establish the proper management of abandoned metal mines in the future. Methods: For a total of 258 residents who lived close to abandoned mines in Gangwon-province and Gyeonggi-province, the exposure factors and biomarkers in their blood and urine were comparatively analyzed via multiple regression analysis. Results: The blood levels of lead and mercury and the cadmium levels in urine were found to be higher in the study group than that in the average Korean. For the blood levels of heavy metals according to each exposure factor, all of them were found to be significantly higher in both of the group residing for a longer period of time and the group living closer to the source of pollutants. Multiple regression analysis disclosed that all the heavy metals, except lead, in their blood were significantly reduced in proportion to the increased distance of inhabitancy from the mines. Their other biomarkers were within the normal ranges. Conclusions: We found that the distance between the residential village and the mines was a factor that affects the blood level of heavy metals in the villagers. This finding could be an important factor when developing a management model for the areas that surround abandoned metal mines. (ED note: I much like this important study.)

Association of Bovine CSRP3 and ACOX1 Genes with Carcass and Meat Quality Traits

이종관,조용민,이준헌,Lee, Jong-Kwan,Cho, Yong-Min,Lee, Jun-Heon Institute of Agricultural Science 2010 Korean Journal of Agricultural Science Vol.37 No.2

There is no investigation has yet been conducted for ACOX1 and CSRP3 gene polymorphisms in Korean cattle (Hanwoo), and their associations with carcass and meat quality traits. In this study, SNPs in ACOX1 and CSRP3 genes were identified and their associations with carcass and meat quality traits were investigated in 227 Hanwoo animals. Two SNPs (g.224G> A and g.19491G>A) in ACOX1 gene and one SNP (g.14859C>T) in CSRP3 gene were identified in Hanwoo and sequence analysis indicated that these SNPs were located in the coding regions. The allele frequencies of ACOX1 g.224G>A and g.19491G>A SNPs were 0.57, 0.43, and 0.56 and 0.44, respectively, For CSRP3 g.14859C>T polymorphism, the C and T allele frequencies were 0.64 and 0.36, respectively. The Hanwoo cattle were used to detect PCR-RFLP patterns for estimating the allele frequencies. Single marker association analyses were performed between genotype of each SNP, and carcass and meat quality association traits to evaluate the relationships in Hanwoo. The g.224G>A SNP genotypes of ACOX1 gene, which was significantly associated with meat quantity grade at slaughter (P<0.03) and backfat thickness tended to be greater (P=0.06) in Hanwoo. The previously identified g.14859C>T SNP was used in this study and the obtained genotype and allele frequencies are almost similar with the previous results reported by Bhuiyan et al. (2007). However, no significant association was found between g.19491G>A SNP in the ACOX1 and g.14859C>T SNP genotypes of CSRP3 gene and considered carcass and meat quality traits. In conclusion, the information on the identified SNPs in CSRP3 and ACOX1 genes could be useful for further association study and haplotype analysis for the development of carcass and meat quality traits in Hanwoo.

3/8″유압 퀵 커플러의 피스톤형상을 고려한 최적설계에 관한 연구

김남용(Nam-Yong Kim),우위팅(Yu-Ting Wu),진진(Zhen Qin),조용민(Yong-Min Cho),류성기(Sung-Ki Lyu) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.2

A hydraulic quick coupler is a component used to easily connect or disconnect pipes or hoses that transfer high pressure fluid without leakage in various mechanical devices. In this study, to obtain an optimal design of a 3/8" hydraulic quick coupler, the effect of different shapes of the internal piston on the internal flow characteristics of the coupler was analyzed and evaluated through numerical analysis based on computational fluid dynamics. Subsequently, the optimal shape design of the internal piston was obtained by comparing the flow characteristics results such as velocity distribution, temperature distribution, and the pressure drop of the hydraulic quick coupler.

한우에 있어서 유전체 육종가 추정

이승환,김형철,임다정,당창권,조용민,김시동,이학교,이준헌,양보석,오성종,홍성구,장원경,Lee, Seung Hwan,Kim, Heong Cheul,Lim, Dajeong,Dang, Chang Gwan,Cho, Yong Min,Kim, Si Dong,Lee, Hak Kyo,Lee, Jun Heon,Yang, Boh Suk,Oh, Sung Jong,Hong, S Institute of Agricultural Science 2012 Korean Journal of Agricultural Science Vol.39 No.3

Genomic breeding value (GEBV) has recently become available in the beef cattle industry. Genomic selection methods are exceptionally valuable for selecting traits, such as marbling, that are difficult to measure until later in life. One method to utilize information from sparse marker panels is the Bayesian model selection method with RJMCMC. The accuracy of prediction varies between a multiple SNP model with RJMCMC (0.47 to 0.73) and a least squares method (0.11 to 0.41) when using SNP information, while the accuracy of prediction increases in the multiple SNP (0.56 to 0.90) and least square methods (0.21 to 0.63) when including a polygenic effect. In the multiple SNP model with RJMCMC model selection method, the accuracy ($r^2$) of GEBV for marbling predicted based only on SNP effects was 0.47, while the $r^2$ of GEBV predicted by SNP plus polygenic effect was 0.56. The accuracies of GEBV predicted using only SNP information were 0.62, 0.68 and 0.73 for CWT, EMA and BF, respectively. However, when polygenic effects were included, the accuracies of GEBV were increased to 0.89, 0.90 and 0.89 for CWT, EMA and BF, respectively. Our data demonstrate that SNP information alone is missing genetic variation information that contributes to phenotypes for carcass traits, and that polygenic effects compensate genetic variation that whole genome SNP data do not explain. Overall, the multiple SNP model with the RJMCMC model selection method provides a better prediction of GEBV than does the least squares method (single marker regression).

유전체정보활용 한우개량효율 증진

이승환(Seung Hwan Lee),조용민(Yong Min Cho),이준헌(Jun Heon Lee),오성종(Seong Jong Oh) 충남대학교 농업과학연구소 2015 농업과학연구 Vol.42 No.4

Quantitative traits are mostly controlled by a large number of genes. Some of these genes tend to have a large effect on quantitative traits in cattle and are known as major genes primarily located at quantitative trait loci (QTL). The genetic merit of animals can be estimated by genomic selection, which uses genome-wide SNP panels and statistical methods that capture the effects of large numbers of SNPs simultaneously. In practice, the accuracy of genomic predictions will depend on the size and structure of reference and training population, the effective population size, the density of marker and the genetic architecture of the traits such as number of loci affecting the traits and distribution of their effects. In this review, we focus on the structure of Hanwoo reference and training population in terms of accuracy of genomic prediction and we then discuss of genetic architecture of intramuscular fat(IMF) and marbling score(MS) to estimate genomic breeding value in real small size of reference population.