Yeongju, South Korea
Yeongju, South Korea

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Lee S.J.,Korea Advanced Institute of Science and Technology | Park J.M.,Kyungbuk College
Key Engineering Materials | Year: 2017

This study investigated the resistance of garnet fiber concrete (hereinafter, GFC) to magnesium sulfate. GFC was fabricated in various mix ratios using GA, nylon (Ny), polypropylene (PP), and others. Plain concrete without GA was also fabricated for comparison with GFC. The test pieces were soaked in 10% magnesium sulfate for up to 210 days to test their compressive strengths, sulfate deterioration factors (SDFs), and mass losses. It was observed from the test results that the compressive strength test pieces mixed with GA and Ny, which perform the pozzolanic reaction, had excellent performances under the influence of sulfate. The plain concrete underwent greater mass loss compared to the GFC test pieces. The test results showed that the GFC mixed with 10% GA and Ny was more resistant to magnesium sulfate than the GFC with PP. © 2017 Trans Tech Publications.

Lee S.J.,Korea Advanced Institute of Science and Technology | Park J.M.,Kyungbuk College
Key Engineering Materials | Year: 2017

This paper deals with structural behavior of highly intelligent reinforced concrete (hereinafter, HIRC) beams actuated by embedded shape memory alloy wires through an extensive experimental program. The experiments were conducted under the monotonic loading condition. Based on the structural experiments involving HIRC, load-temperature deflection curve, ductility-effective depth, recovery, crack patterns, and failure mode comparison were made for investigative purposes. The results of the experiments confirmed that the ductility, recovery rates, and other properties of the HIRC specimens reinforced with SMA, wire mesh, fiber, and admixtures were superior to those of the unreinforced RCBs. The experimental results indicate that a good recovery rate in the HIRC beams could be obtained when the SMA wires were heated. Accordingly, the SMA wires could be potentially used for structural self-rehabilitation capability and deformation monitoring in architecture and civil structures. © 2017 Trans Tech Publications.

Kim C.H.,Hanyang University | Jeong J.H.,Hanyang University | Bolch W.E.,University of Florida | Cho K.-W.,Korea Institute of Nuclear Safety | Hwang S.B.,Kyungbuk College
Physics in Medicine and Biology | Year: 2011

Even though the hybrid phantom embodies both the anatomic reality of voxel phantoms and the deformability of stylized phantoms, it must be voxelized to be used in a Monte Carlo code for dose calculation or some imaging simulation, which incurs the inherent limitations of voxel phantoms. In the present study, a voxel phantom named VKH-Man (Visible Korean Human-Man), was converted to a polygon-surface phantom (PSRK-Man, Polygon-Surface Reference Korean-Man), which was then adjusted to the Reference Korean data. Subsequently, the PSRK-Man polygon phantom was directly, without any voxelization process, implemented in the Geant4 Monte Carlo code for dose calculations. The calculated dose values and computation time were then compared with those of HDRK-Man (High Definition Reference Korean-Man), a corresponding voxel phantom adjusted to the same Reference Korean data from the same VKH-Man voxel phantom. Our results showed that the calculated dose values of the PSRK-Man surface phantom agreed well with those of the HDRK-Man voxel phantom. The calculation speed for the PSRK-Man polygon phantom though was 70-150 times slower than that of the HDRK-Man voxel phantom; that speed, however, could be acceptable in some applications, in that direct use of the surface phantom PSRK-Man in Geant4 does not require a separate voxelization process. Computing speed can be enhanced, in future, either by optimizing the Monte Carlo transport kernel for the polygon surfaces or by using modern computing technologies such as grid computing and general-purpose computing on graphics processing units programming. © 2011 Institute of Physics and Engineering in Medicine.

Shin D.S.,Ajou University | Chung M.S.,Ajou University | Park H.S.,Dongguk University | Park J.S.,Dongguk University | Hwang S.B.,Kyungbuk College
Anatomical Sciences Education | Year: 2011

The interpretation of computed tomographs (CTs) and magnetic resonance images (MRIs) to diagnose clinical conditions requires basic knowledge of sectional anatomy. Sectional anatomy has traditionally been taught using sectioned cadavers, atlases, and/or computer software. The computer software commonly used for this subject is practical and efficient for students but could be more advanced. The objective of this research was to present browsing software developed from the Visible Korean images that can be used for teaching sectional anatomy. One thousand seven hundred and two sets of MRIs, CTs, and sectioned images (intervals, one millimeter) of a whole male cadaver were prepared. Over 900 structures in the sectioned images were outlined and then filled with different colors to elaborate each structure. Software was developed where four corresponding images could be displayed simultaneously; in addition, the structures in the image data could be readily recognized with the aid of the color-filled outlines. The software, distributed free of charge, could be a valuable tool to teach medical students. For example, sectional anatomy could be taught by showing the sectioned images with real color and high resolution. Students could then review the lecture by using the sectioned and color-filled images on their own computers. Students could also be evaluated using the same software. Furthermore, other investigators would be able to replace the images for more comprehensive sectional anatomy. © 2011 American Association of Anatomists.

Shin D.S.,Ajou University | Park J.S.,Dongguk University | Park H.S.,Dongguk University | Hwang S.B.,Kyungbuk College | Chung M.S.,Ajou University
Surgical and Radiologic Anatomy | Year: 2012

Purpose Sectioned images of cadavers enable creation of realistic three-dimensional (3D) models. In order to build a 3D model of a structure, the structure has to be outlined in the sectioned images. The outlining process is time consuming; therefore, users want to be provided with outlined images. The more detailed structures are outlined, the greater potential for wider application of the outlined images. Methods In the Visible Korean, sectioned images (intervals 0.2 mm) of the entire body of a male cadaver were prepared. In the available 1,702 sectioned images (intervals 1 mm), 937 structures were outlined over a period of 8 years. The outlined images were altered to black-filled images for each structure; black-filled images were selected for distribution in order to maintain small file sizes. Results We attempted to determine whether black-filled images could be used in various situations. The outlines of these images were interpolated for production of new images at 0.2 mm intervals. The outlines were then filled with different colors for construction of color-filled images of all structures. Volume and surface reconstructions of the black-filled images were executed in order to build volume and surface models. Conclusion The black-filled images with corresponding sectioned images presented here are the source of realistic 3D models for use in medical simulation systems. © Springer-Verlag 2011.

Chun K.H.,Kyungbuk College | Park E.,Korea University
Osong Public Health and Research Perspectives | Year: 2016

Objectives The purpose of this study is to identify the types of perception of emotional intelligence among nursing and medical students and their characteristics using Q methodology, and to build the basic data for the development of a program for the would-be medical professionals to effectively adapt to various clinical settings in which their emotions are involved. Methods Data were collected from 35 nursing and medical students by allowing them to classify 40 Q statements related to emotional intelligence and processed using the PC QUANL program. Results The perceptions of emotional intelligence by nursing and medical students were categorized into three types: “sensitivity–control type”, “sympathy–motivation type”, and “concern–sympathy type”. Conclusion The perceptions of emotional intelligence by nursing and medical students can represent an effective coping strategy in a situation where emotion is involved. In the medical profession, an occupation with a high level of emotional labor, it is important to identify the types of emotional intelligence for an effective coping strategy, which may have a positive effect on the performance of an organization. Based on the findings of this study, it is necessary to plan an education program for vocational adaptability for nursing and medical students by their types. © 2016

Lee S.J.,Korea Advanced Institute of Science and Technology | Park J.M.,Kyungbuk College
Advanced Materials Research | Year: 2014

The purpose of this study is to evaluate the flexural behavior of hybrid high performance RC beams with web openings (Hy-HPRWO) that are constructed by using circle steel tube, hybrid fibers and Garnet, Fly-ash. One regular RC beam with openings (HPRC) and four Hy-HPRWO specimens were manufactured and tested under monotonic loading. It was evaluated by flexural experiment of Hy-HPRWO through comparison of failure mode, load-deflection curves, ductility and ultimate load (Vu). Test results showed that the ultimate load of the Hy-FPSC3 specimens were approximately 5.82% better than that of the HPRC, in addition their ductility behavior was 68.1% better than the HPRC. © (2014) Trans Tech Publications, Switzerland.

Shin D.S.,Ajou University | Jang H.G.,Ajou University | Hwang S.B.,Kyungbuk College | Har D.-H.,Chung - Ang University | And 2 more authors.
Anatomical Sciences Education | Year: 2013

In the Visible Korean project, serially sectioned images of the pelvis were made from a female cadaver. Outlines of significant structures in the sectioned images were drawn and stacked to build surface models. To improve the accessibility and informational content of these data, a five-step process was designed and implemented. First, 154 pelvic structures were outlined with additional surface reconstruction to prepare the image data. Second, the sectioned and outlined images (in a browsing software) as well as the surface models (in a PDF file) were placed on the Visible Korean homepage in a readily-accessible format. Third, all image data were visualized with interactive elements to stimulate creative learning. Fourth, two-dimensional (2D) images and three-dimensional (3D) models were superimposed on one another to provide context and spatial information for students viewing these data. Fifth, images were designed such that structure names would be shown when the mouse pointer hovered over the 2D images or the 3D models. The state-of-the-art sectioned images, outlined images, and surface models, arranged and systematized as described in this study, will aid students in understanding the anatomy of female pelvis. The graphic data accompanied by corresponding magnetic resonance images and computed tomographs are expected to promote the production of 3D simulators for clinical practice. © 2013 American Association of Anatomists.

Lee S.J.,Korea Advanced Institute of Science and Technology | Park J.M.,Kyungbuk College
IOP Conference Series: Materials Science and Engineering | Year: 2015

The purpose of this study was to evaluate the shear strength and structural behavior of reinforced-concrete beams with web openings (hereinafter, "HPRWO"), where the web openings are reinforced with circular steel tubes. The experiments were conducted under the monotonic loading condition. Based on the structural experiments involving HPRWO, ultimate load ratio (d0,d0/h, etc.), ductility, load-deflection curve, and failure mode comparisons were made for evaluation purposes. This study utilized the design formula for predicting the shear strength proposed by the previous studies and formulas to determine the appropriate shear strength for HPRWO. The results of the experiments confirmed that the rigidity, ductility, and other properties of the HPRWO specimens reinforced with circular steel tubes, fiber, and admixtures were superior to those of the unreinforced HPRWOs. With Mansur's formula, a noticeable tendency for the increase in d0 and the sectional area of the web openings to lead to the overestimation of Vu/Vu,cal was found. The Vu/Vu,cal value was found to be more in line with the experiment results based on the AIJ formula compared with the results obtained using other formulas.

Cha H.-G.,Kyungbuk College | Oh D.-W.,Cheongju University
International Journal of Rehabilitation Research | Year: 2016

This study aimed to explore the effects of mirror therapy integrated with task-oriented exercise on balance function in poststroke hemiparesis. Twenty patients with poststroke hemiparesis were assigned randomly to an experimental group (EG) and a control group (CG), with 10 individuals each. Participants of the EG and CG received a taskoriented exercise program with a focus on the strengthening of the lower limb and the practice of balancerelated functional tasks. An additional option for the EG was front and side wall mirrors to provide visual feedback for their own movements while performing the exercise. The program was performed for 30 min, twice a day, five times per week for 4 weeks. Outcome measures included the Berg balance scale, the timed up-and-go test, and quantitative data (balance index and dynamic limits of stability). In the EG and CG, all variables showed significant differences between pretest and post-test (P<0.05), and post-test values of all variables appeared to be significantly different between two groups (P<0.05). Furthermore, in the EG, the change values between pretest and post-test values of Berg balance scale (13.00 ± 3.20 vs. 6.60 ±4.55 scores), and timed up-and-go test (6.45 ± 3.00 vs. 3.61 ±1.84 s), balance index (2.29 ± 0.51 vs. 0.96± 0.65 scores), dynamic limits of stability (7.70± 3.83 vs. 3.70± 4.60 scores) were significantly higher than those of the CG (P<0.05). The findings suggest that a mirror therapy may be used as a beneficial therapeutic option to facilitate the effects of a task-oriented exercise on balance function of patients with poststroke hemiparesis. Copyright © 2016 Wolters Kluwer Health, Inc. All rights reserved.

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