Dongnam Health College

Suigen, South Korea

Dongnam Health College

Suigen, South Korea
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Kim M.C.,Samsung | Chang K.H.,Samsung | Hwang J.H.,Samsung | Nam Y.C.,Samsung | And 2 more authors.
Radiation Protection Dosimetry | Year: 2017

To assess the doses delivered to pediatric patients during computed tomography (CT) examinations of the brain, chest, highresolution lung and abdomen, and to establish diagnostic reference levels (DRLs) for various age groups in Korea. Dose survey was done to the 19 hospitals performing CT on children, addressing the scan parameters, volume CT dose index (CTDIvol) and dose length product (DLP). Per five age group (0, 1, 2-5, 6-10, 11-17 y of age), the proposed DRLs for brain, chest, high-resolution lung and abdomen CT are, respectively, in terms of CTDIvol: 18, 23, 26, 31, 36mGy; 2, 3, 4, 6, 8mGy; 2, 3, 4, 5, 7mGy; 3, 4, 5, 6, 9mGy; and in terms of DLP: 260, 350, 420, 500, 620mGy·cm; 50, 80, 100, 170, 340mGy·cm; 30, 40, 60, 90, 280 mGy·cm; 70, 80, 200, 300, 500mGy·cm. Compared with published DRLs our suggestion for pediatric CT dose is the lower end. However, an optimization process should be initiated to reduce the spread in patient dose among hospitals despite same CT protocols shown in the study. A major element of this process should be the establishment of institution performance standard and the use of built DRLs. © The Author 2016. Published by Oxford University Press. All rights reserved.


PubMed | Korea University, Pohang College, Namseoul University, Dongnam Health College and 3 more.
Type: Journal Article | Journal: Journal of physical therapy science | Year: 2014

[Purpose] The purpose of this study was to investigate thoracic coupled motions of 20 Korean young individuals. [Methods] Thoracic motion of twenty healthy male college students aged 23.23.1 was examined. The coupled motions of the thoracic regions T1-4, T4-8, T8-12 were measured using a three dimensional motion capture system. [Results] Coupled axial rotation in the same direction as lateral bending was observed in T1-T4 and T4-T8 in the neutral, flexed, and extended postures of the thoracic spine. In T8-T12, coupled axial rotation in the same direction as lateral bending were observed in the neutral and flexed postures, while coupled axial rotation in the opposite direction was observed in an extended posture. [Conclusion] The patterns of coupled motions in the thoracic spine demonstrated some variability between postures and regions in vivo. However, coupled motions in the same direction were predominantly lateral flexion or axial rotation in the three postures.


Kim M.C.,Samsung | Han D.K.,Eulji University | Nam Y.C.,Samsung | Kim Y.M.,Samsung | Yoon J.,Dongnam Health College
Radiation Protection Dosimetry | Year: 2015

14 620 sets of patient dose data were obtained for 31 different models of computed tomography (CT) equipment (total 73) with 18 types of CT examination in Korea. Specific diagnostic reference levels (DRLs) for this study in terms of third quartile volumetric CT dose index in mGy [and dose-length product (DLP) in mGy.cm] are as follows: head, 53 (910); neck, 20 (770); chest, 14 (710); abdomen, 14 (1000); stomach, 14 (1000); liver, 14 (1700); pancreas, 14 (1700); kidney, 14 (2100); cervical spine, 30 (600); lumbar spine, 25 (760); hip, 17 (600); cardiac CT angiography, 45 (1250); head CT angiography, 43 (1900); liver CT angiography, 14 (1400) and thoraco-abdominal CT angiography, 16 (2000). In the present study, DRLs in terms of volumetric CT dose index were below previously published reference levels, partly because the newer CT equipments have improved technology that facilitates lower patient dose. Meanwhile, DRLs in terms of DLP were higher, because multi-phase scanning protocols with prolonged scan coverage have been widely used. © The Author 2014. Published by Oxford University Press. All rights reserved.


Kim Y.,Seoul National University | Kim S.-W.,Seoul National University | Yoon S.-C.,Seoul National University | Kim M.-H.,Seoul National University | Park K.-H.,Dongnam Health College
Atmospheric Environment | Year: 2014

This paper describes aerosol optical and physical properties and the corresponding meteorological analysis during a winter-time fine aerosol event at a regional background station, Gosan, in Korea. Spatio-temporal distributions of air pollutants over Northeast Asia during winter are governed by continental outflows; however, winter is the highest in magnitude (9.5±8.7Mm-1) of aerosol absorption coefficient (σa) among other seasons and the second highest in magnitude (105.3±104.8Mm-1) of aerosol scattering coefficient (σs) after spring at the Gosan site. Values for σs and σa at Gosan during the winter polluted period (WPP; January 3 to 10, 2008) were recorded as 238.97±123.85 and 18.42±8.49Mm-1, respectively, which were approximately 5 times greater than those during the winter clean period (WCP; January 13 to 16, 2008) of this study. An ensemble analysis of the OMI aerosol index, wind vectors and background trajectories during the WPP reveals that a slow-moving anticyclonic system, preceded by a frontal system, brought heavy aerosol loading from the Asian continent to the Gosan site. Space-based lidar CALIOP observations support the presence of heavy loadings of aerosol and pollutant plumes over the Yellow sea, before arriving at the Gosan. © 2013 Elsevier Ltd.


PubMed | Dongnam Health College, Eulji University and Samsung
Type: Comparative Study | Journal: Radiation protection dosimetry | Year: 2015

14,620 sets of patient dose data were obtained for 31 different models of computed tomography (CT) equipment (total 73) with 18 types of CT examination in Korea. Specific diagnostic reference levels (DRLs) for this study in terms of third quartile volumetric CT dose index in mGy [and dose-length product (DLP) in mGy.cm] are as follows: head, 53 (910); neck, 20 (770); chest, 14 (710); abdomen, 14 (1000); stomach, 14 (1000); liver, 14 (1700); pancreas, 14 (1700); kidney, 14 (2100); cervical spine, 30 (600); lumbar spine, 25 (760); hip, 17 (600); cardiac CT angiography, 45 (1250); head CT angiography, 43 (1900); liver CT angiography, 14 (1400) and thoraco-abdominal CT angiography, 16 (2000). In the present study, DRLs in terms of volumetric CT dose index were below previously published reference levels, partly because the newer CT equipments have improved technology that facilitates lower patient dose. Meanwhile, DRLs in terms of DLP were higher, because multi-phase scanning protocols with prolonged scan coverage have been widely used.


PubMed | Dongnam Health College, Eulji University and Samsung
Type: | Journal: Radiation protection dosimetry | Year: 2016

To assess the doses delivered to pediatric patients during computed tomography (CT) examinations of the brain, chest, high-resolution lung and abdomen, and to establish diagnostic reference levels (DRLs) for various age groups in Korea. Dose survey was done to the 19 hospitals performing CT on children, addressing the scan parameters, volume CT dose index (CTDIvol) and dose length product (DLP). Per five age group (0, 1, 2-5, 6-10, 11-17 y of age), the proposed DRLs for brain, chest, high-resolution lung and abdomen CT are, respectively, in terms of CTDIvol: 18, 23, 26, 31, 36 mGy; 2, 3, 4, 6, 8 mGy; 2, 3, 4, 5, 7 mGy; 3, 4, 5, 6, 9 mGy; and in terms of DLP: 260, 350, 420, 500, 620 mGycm; 50, 80, 100, 170, 340 mGycm; 30, 40, 60, 90, 280 mGycm; 70, 80, 200, 300, 500 mGycm. Compared with published DRLs our suggestion for pediatric CT dose is the lower end. However, an optimization process should be initiated to reduce the spread in patient dose among hospitals despite same CT protocols shown in the study. A major element of this process should be the establishment of institution performance standard and the use of built DRLs.


PubMed | Dongnam Health College, Korea University, Hallym University and Kangwon National University
Type: Journal Article | Journal: Journal of the neurological sciences | Year: 2015

The participation of Na(+)/H(+) exchanger (NHE) in neuronal damage/death in the hippocampal CA1 region (CA1) induced by transient forebrain ischemia has not been well established, although acidosis may be involved in neuronal damage/death. In the present study, we examined the effect of ischemic preconditioning (IPC) on NHE1 immunoreactivity following a 5min of transient forebrain ischemia in gerbils. The animals used in the study were randomly assigned to four groups (sham-operated-group, ischemia-operated-group, IPC plus (+) sham-operated-group and IPC+ischemia-operated-group). IPC was induced by subjecting animals to 2min of ischemia followed by 1day of recovery. A significant neuronal loss was found in the stratum pyramidale (SP) of the CA1, not the CA2/3, of the ischemia-operated-group at 5days post-ischemia. However, in the IPC+ischemia-operated-group, neurons in the SP of the CA1 were well protected. NHE1 immunoreactivity was not detected in any regions of the CA1-3 of the sham- and IPC+sham-operated-groups. However, the immunoreactivity was apparently expressed in the SP of the CA1-3 after ischemia, and the NHE1immunoreactivity was very weak 5days after ischemia; however, at this point in time, strong NHE1immunoreactivity was found in astrocytes in the CA1. In the CA2/3, NHE1immunoreactivity was slightly changed, although NHE1immunoreactivity was expressed in the SP. In the IPC+ischemia-operated-groups, NHE1 immunoreactivity was also expressed in the SP of the CA1-3; however, the immunoreactivity was more slightly changed than that in the ischemia-operated-groups. In brief, our findings show that IPC dramatically protected CA1 pyramidal neurons and strongly inhibited NHE1 expression in the SP of the CA1 after ischemia-reperfusion. These findings suggest that the inhibition of NHE1 expression may be necessary for neuronal survival from transient ischemic damage.


Choi K.,Baekseok University | Song S.H.,Hanyang University | Kim S.G.,Dongnam Health College
Journal of the Optical Society of Korea | Year: 2010

We introduce a new method for lens design that combines an eyepiece with the finite model eye, to make a corrected version of the accommodation-dependent Navarro eye. The optical system that we designed , which includes a human eye, takes into account the aberration of the eye and increases the performance of the image in the retina. In the design results, for the optimized eyepiece combined with the corrected Navarro eye, visual acuity is 1.40. Compared with the existing method of eyepiece design using inverse ray tracing with the corrected Navarro eye, MTF value was recorded as 0.079 to 0.283 at 160 lp/mm and visual performance was improved.


Hong S.P.,Yonsei University | Park H.,Dongnam Health College | Kwon J.-S.,Florida International University | Yoo E.,Cheongju University
NeuroRehabilitation | Year: 2014

Background: Eccentric viewing training can be successfully applied in the clinical setting based on positive evidence. Nonetheless, published research should be integrated to provide a conclusive perspective of the efficacy of eccentric viewing training. Objective: Meta-analysis was conducted to examine effectiveness of eccentric viewing training on daily visual activities for individuals with age-related macular degeneration (AMD). Methods: The papers used in this study were located through PubMed, Ovid, ProQuest, EBSCOhost, RISS, and KMbase on studies published between January, 1990 and December, 2012. The keywords for searching were 'age-related macular degeneration' and 'eccentric viewing', 'eccentric fixation', 'peripheral vision' or 'preferred retinal loci'. The effect sizes were calculated using Comprehensive Meta-Analysis 2.0 and interpreted according to Cohen's criteria. Results: A total of 258 studies were found, among which five papers suited the main selection criteria for final analysis. The entire effect size was 0.660 (95% CI, 0.232 ~ 1.088), indicating a moderate effect size of the eccentric viewing training for individuals with AMD in their daily visual activities (p < 0.05). Conclusions: The results of this study demonstrated the clinical effectiveness of eccentric viewing training for individuals with AMD. This result should be interpreted cautiously, though, given the possibility of publication bias. © 2014 - IOS Press and the authors. All rights reserved.


Kim H.,Dongnam Health College | Ahn H.,Kyonggi University | Kim K.P.,Kyonggi University
KSII Transactions on Internet and Information Systems | Year: 2014

This paper formalizes a special type of social networking knowledge, which is called "workflow performer-role affiliation networking knowledge." A workflow model specifies execution sequences of the associated activities and their affiliated relationships with roles, performers, invoked-applications, and relevant data. In Particular, these affiliated relationships exhibit a stream of organizational work-sharing knowledge and utilize business process intelligence to explore resources allotting and planning knowledge concealed in the corresponding workflow model. In this paper, we particularly focus on the performer-role affiliation relationships and their implications as organizational and business process intelligence in workflow-driven organizations. We elaborate a series of theoretical formalisms and practical implementation for modeling, discovering, and visualizing workflow performer-role affiliation networking knowledge, and practical details as workflow performer-role affiliation knowledge representation, discovery, and visualization techniques. These theoretical concepts and practical algorithms are based upon information control net methodology for formally describing workflow models, and the affiliated knowledge eventually represents the various degrees of involvements and participations between a group of performers and a group of roles in a corresponding workflow model. Finally, we summarily describe the implications of the proposed affiliation networking knowledge as business process intelligence, and how worthwhile it is in discovering and visualizing the knowledge in workflow-driven organizations and enterprises that produce massively parallel interactions and large-scaled operational data collections through deploying and enacting massively parallel and large-scale workflow models. © 2014 KSII.

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