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이정석(Jungsuk Lee),윤문영(Moonyoung Yoon),양갑진(Kapjin Yang),송정훈(Jeonghoon Song),제우성(Woosung Che),부광석(Kwangsuk Boo),김흥섭(Heungseob Kim5) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
The fundamental reason of noise in gear system is transmission error due to deflection of gear teeth. The vibration from transmission error moves to shaft and bearing. This vibration generates bearing force which exite gear box and finally radiate as noise outside. Therefore, studying transmission error is the most important to predict which is the fundamental reason of gear noise. In this paper, transmission error due to teeth deflection was predicted and shaft torsion was not considered in order to find only teeth deflection. For this reason, shaft was modeled as rigid, and only gear pair was modeled as flexible body. transmission error was predicted by Abaqus, FEA program, and this was compared for Spur and Helical type.
Kim, Jeonghoon,Jeong, Kyoung Yong,Kwon, Ho-Jang,Yang, Heasuk,Yum, Hye Yung,Lee, Seon Ah,Kim, Chae-Bong,Kim, Hyunjung,Lim, Wan Ryung,Hong, Soyoung,Kim, Kyoosang The Korean Society of Environmental Toxicology 2015 환경독성보건학회지 Vol.30 No.-
Objectives Bedding in childcare centers (CCCs) can hold house dust mite (HDM) allergens. This study examined whether HDM allergen levels can be reduced through the distribution of an educational newsletter on bedding control to parents of CCC children in Korea. Methods All 38 CCCs were measured for Der 1 (sum of Der f 1 and Der p 1) concentrations on classroom floors and bedding before the intervention. Educational newsletters on children's bedding control were sent to 21 CCCs by mail, and teachers were asked to distribute the newsletters to the parents of the children (intervention group). The remaining 17 CCCs were not sent newsletters (control group). The measurement of Der 1 concentrations in 38 CCCs was repeated after the intervention. Dust samples were collected with a vacuum cleaner and analyzed using enzyme-linked immunosorbent assay methods. Results The Der 1 concentrations on the bedding were significantly higher than those on the floors in 38 CCCs at baseline (p < 0.05). Although changes of the Der 1 concentrations for the control group (n=17) were not significant, Der 1 concentrations for the intervention group (n=21) decreased significantly from 2077.9 ng/g dust to 963.5 ng/g dust on the floors and from 3683.9 ng/g dust to 610.4 ng/g dust on bedding (p < 0.05). Conclusions The distribution of educational newsletters on bedding control to parents may be an effective means of controlling HDMs in CCCs.
Jeonghoon Kim,Kyoung Yong Jeong,Ho-Jang Kwon,Heasuk Yang,Hye Yung Yum,Seon Ah Lee,Chae-Bong Kim,Hyunjung Kim,Wan Ryung Lim,Soyoung Hong,Kyoosang Kim 환경독성보건학회 2015 환경독성보건학회지 Vol.30 No.-
Objectives: Bedding in childcare centers (CCCs) can hold house dust mite (HDM) allergens. This study examined whether HDM allergen levels can be reduced through the distribution of an educational newsletter on bedding control to parents of CCC children in Korea. Methods: All 38 CCCs were measured for Der 1 (sum of Der f 1 and Der p 1) concentrations on classroom floors and bedding before the intervention. Educational newsletters on children’s bedding control were sent to 21 CCCs by mail, and teachers were asked to distribute the newsletters to the parents of the children (intervention group). The remaining 17 CCCs were not sent newsletters (control group). The measurement of Der 1 concentrations in 38 CCCs was repeated after the intervention. Dust samples were collected with a vacuum cleaner and analyzed using enzyme-linked immunosorbent assay methods. Results: The Der 1 concentrations on the bedding were significantly higher than those on the floors in 38 CCCs at baseline (p <0.05). Although changes of the Der 1 concentrations for the control group (n=17) were not significant, Der 1 concentrations for the intervention group (n=21) decreased significantly from 2077.9 ng/g dust to 963.5 ng/g dust on the floors and from 3683.9 ng/g dust to 610.4 ng/g dust on bedding (p <0.05). Conclusions: The distribution of educational newsletters on bedding control to parents may be an effective means of controlling HDMs in CCCs.
Kim, Jeonghoon,Kwon, Ho-Jang,Lee, Kiyoung,Lee, Do-Hoon,Paek, Yujin,Kim, Sung-Soo,Hong, Soyoung,Lim, Wanryung,Heo, Jae-Hyeok,Kim, Kyoosang Oxford University Press 2015 NICOTINE & TOBACCO RESEARCH Vol.17 No.11
<P><B>Introduction:</B></P><P>The Korean government implemented a smoking ban at square floor area of ≥150 m<SUP>2</SUP>, rather than <150 m<SUP>2</SUP>, restaurants and pubs from July 2013. This study examined the effects of the smoking regulations in restaurants and pubs in terms of the air quality, biomarker levels and health effects on staff.</P><P><B>Methods:</B></P><P>Particulate matter smaller than 2.5 µm (PM<SUB>2.5</SUB>) was measured in 146 facilities before and 1 month after the ban. The urinary cotinine and 4-(methylnitrosamino)-1-(3-pyridyl)-1- butanol (NNAL) levels were measured in 101 staff members at 77 facilities before and 1 month after the ban. We also measured self-reported respiratory and sensory symptoms on both phases.</P><P><B>Results:</B></P><P>Of the 146 facilities, 121 facilities were included in the PM<SUB>2.5</SUB> analysis. In ≥150 m<SUP>2</SUP> pubs, the indoor PM<SUB>2.5</SUB> concentration was significantly reduced after the ban (<I>p</I> < .05). While the urinary cotinine concentrations of the staff in all facilities were not changed after the ban, the total NNAL concentrations of the staff in ≥150 m<SUP>2</SUP> pubs were significantly reduced after the ban (<I>p</I> < .05). The health effects on staff show that only sensory symptoms significantly improved in ≥150 m<SUP>2</SUP> facilities after the ban (<I>p</I> < .05).</P><P><B>Conclusions:</B></P><P>The smoking ban significantly reduced the levels of PM<SUB>2.5</SUB> and total NNAL concentrations in ≥150 m<SUP>2</SUP> pubs and improved sensory health among staff in ≥150 m<SUP>2</SUP> facilities. The results of this study can be useful in supporting an expansion of the smoking ban in all indoor places, including <150 m<SUP>2</SUP> restaurants and pubs.</P>
Silicon MEMS probe using a simple adhesive bonding process for permittivity measurement
Kim, Jung-Mu,Oh, Dong Hoon,Yoon, Jeonghoon,Cho, Sungjoon,Kim, Namgon,Cho, Jeiwon,Kwon, Youngwoo,Cheon, Changyul,Kim, Yong-Kweon IOP 2005 Journal of micromechanics and microengineering Vol.15 No.11
<P>We developed a silicon MEMS probe for permittivity measurements using an adhesive bonding process. Only two photolithographic masks are required to fabricate the probe, which can be implemented through simple bonding processes using silicon substrates and a benzo cyclo butene (BCB) adhesive layer. Undoped silicon substrates with thicknesses of 300 ?m are used as the dielectric layers of the proposed probe. BCB layers, which have good electrical properties at high frequencies as well as adhesive properties for the bonding process, play the role of bonding materials between the two silicon substrates. The length of the probe is 30 mm, and the aperture located at the tip of the probe is 1.1 mm ? 0.62 mm. The permittivity of 0.5% saline was measured, and the results agreed with the values obtained through the Cole–Cole equation. To validate the feasibility of this probe for practical biological applications, we also performed <I>in vivo</I> measurements of the muscle, skin and blood of mice. Due to the simple fabrication process, the cost of the probe can be reduced in comparison with the previous micromachined probe (<A article='0960-1317/15/3/015'>Kim <I>et al</I> 2005 <I>J. Micromech. Microeng.</I> <B>15</B> 543–50</A>) as well as the conventional laser machined probe. Low cost leads to disposability, which is an important factor for practical biomedical applications; and thus, coupled with the probe's capabilities of MMIC integration and CMOS compatibility, this probe has excellent potential in the field of microwave permittivity measurements.</P>
Sixty‐five gene‐based risk score classifier predicts overall survival in hepatocellular carcinoma
Kim, Soo Mi,Leem, Sun‐,Hee,Chu, In‐,Sun,Park, Yun‐,Yong,Kim, Sang Cheol,Kim, Sang‐,Bae,Park, Eun Sung,Lim, Jae Yun,Heo, Jeonghoon,Kim, Yoon Jun,Kim, Dae‐,Ghon,Kaseb, Ahme Wiley Subscription Services, Inc., A Wiley Company 2012 Hepatology Vol.55 No.5
<P><B>Abstract</B></P><P>Clinical application of the prognostic gene expression signature has been delayed due to the large number of genes and complexity of prediction algorithms. In the current study we aimed to develop an easy‐to‐use risk score with a limited number of genes that can robustly predict prognosis of patients with hepatocellular carcinoma (HCC). The risk score was developed using Cox coefficient values of 65 genes in the training set (n = 139) and its robustness was validated in test sets (n = 292). The risk score was a highly significant predictor of overall survival (OS) in the first test cohort (<I>P</I> = 5.6 × 10<SUP>−5</SUP>, n = 100) and the second test cohort (<I>P</I> = 5.0 × 10<SUP>−5</SUP>, n = 192). In multivariate analysis, the risk score was a significant risk factor among clinical variables examined together (hazard ratio [HR], 1.36; 95% confidence interval [CI], 1.13‐1.64; <I>P</I> = 0.001 for OS). <I>Conclusion:</I> The risk score classifier we have developed can identify two clinically distinct HCC subtypes at early and late stages of the disease in a simple and highly reproducible manner across multiple datasets. (H<SMALL>EPATOLOGY</SMALL> 2011)</P>
Progressive Dehazing and Depth Estimation from a Single Hazy Image
Jeonghoon Kim,Sungyoon Kim,Changhoon Pyo,Hyeongmyeon Kim,Changhoon Yim 대한전자공학회 2022 IEIE Transactions on Smart Processing & Computing Vol.11 No.5
We propose a progressive dehazing and depth estimation (PDDE) method with optimal estimation of the attenuation coefficient. We investigated the characteristics of dehazing operations related to the depth and attenuation coefficient for PDDE. Entropy was used as a non-reference image quality metric for optimality assessment of dehazed images. The proposed PDDE method provides an optimal dehazed image and depth estimation from a single hazy image. Experimental results show that the proposed method provides clearer and subjectively better results for single image dehazing than previous image dehazing methods. It also results in a significant improvement in the accuracy of depth estimation from a single hazy image compared with previous depth estimation methods.
Kim, Myoung-Hwan,Choi, Jeonghoon,Yang, Jinhee,Chung, Woosuk,Kim, Ji-Hyun,Paik, Sang Kyoo,Kim, Karam,Han, Seungnam,Won, Hyejung,Bae, Young-Soo,Cho, Suk-Hee,Seo, Jinsoo,Bae, Yong Chul,Choi, Se-Young,Kim The Society 2009 The Journal of neuroscience Vol.29 No.5
<P>IRSp53 is an adaptor protein that acts downstream of Rac and Cdc42 small GTPases and is implicated in the regulation of membrane deformation and actin filament assembly. In neurons, IRSp53 is an abundant postsynaptic protein and regulates actin-rich dendritic spines; however, its in vivo functions have not been explored. We characterized transgenic mice deficient of IRSp53 expression. Unexpectedly, IRSp53(-/-) neurons do not show significant changes in the density and ultrastructural morphologies of dendritic spines. Instead, IRSp53(-/-) neurons exhibit reduced AMPA/NMDA ratio of excitatory synaptic transmission and a selective increase in NMDA but not AMPA receptor-mediated transmission. IRSp53(-/-) hippocampal slices show a markedly enhanced long-term potentiation (LTP) with no changes in long-term depression. LTP-inducing theta burst stimulation enhances NMDA receptor-mediated transmission. Spatial learning and novel object recognition are impaired in IRSp53(-/-) mice. These results suggest that IRSp53 is involved in the regulation of NMDA receptor-mediated excitatory synaptic transmission, LTP, and learning and memory behaviors.</P>
한국 성인의 3차 흡연으로 인한 아이의 건강 유해성 인식과 관련 요인
김정훈(Jeonghoon Kim),윤진하(Jin-Ha Yoon),김지현(Jihyun Kim),이완형(Wanhyung Lee),김영광(Yeong-Kwang Kim),이승현(Seunghyun Lee),김규상(KyooSang Kim) 한국환경보건학회 2018 한국환경보건학회지 Vol.44 No.1
Objectives: Thirdhand smoke (THS) refers to residual tobacco smoke pollutants that remain after cigarette smoking. The purpose of this study was to determine predictors of the belief among adults in Korea that THS is harmful to children. Methods: A population-based sample of 3,000 adults (≥19 years) among a web-based panel in Korea was obtained in November 2016. The respondents filled out questionnaires, including THS beliefs, smoking status, presence of voluntary smoke-free rules at home, and support for the implementation of smoke-free regulations at home. THS beliefs were assessed with a statement that staying in a room today where people smoked yesterday can harm the health of children. Results: Overall, 92.2 % of adults believed that THS exposure could harm the health of children. Respondents who were nonsmokers, believed that SHS exposure were associated with pneumonia of children, lived in home with complete smoke-free rule at home, and supported the implementation of smoke-free regulation at home were more likely to believe that THS could harm for health of children. Conclusions: The majority of Korean adults believed that THS exposure could harm the health of children. Predictors identified in the study can be useful to address the risk of THS beliefs and promote implementation of tobacco control policies.