• Transactions of the Korean Society of Pressure Vessels and Piping
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• v.7 no.3
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• pp.48-53
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• 2011

A PHE (Process Heat Exchanger) is a key component required to transfer heat energy of $950^{\circ}C$ generated in a VHTR (Very High Temperature Reactor) to the chemical reaction that yields a large quantity of hydrogen. A small-scale PHE prototype made of Hastelloy-X is being tested in a small-scale gas loop at Korea Atomic Energy Research Institute. In this study, as a part of the evaluation on the high-temperature structural integrity of the small-scale PHE prototype, we carried out macroscopic high-temperature structural analysis of the small-scale PHE prototype under the gas loop test conditions considering the pipeline stiffness.

• Steel and Composite Structures
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• v.36 no.1
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• pp.87-101
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• 2020

A multi-scale epoxy/CNT/fiberglass annular sector plate is studied in this paper in the view of determining nonlinear forced vibration characteristics. A 3D Mori-Tanaka model is employed for evaluating multi-scale material properties. Thus, all of glass fibers are assumed to have uni-direction alignment and CNTs have random diffusion. The geometry of annular sector plate can be described based on the open angle and the value of inner/outer radius. In order to solve governing equations and derive exact forced vibration curves for the multi-scale annular sector, Jacobi elliptic functions are used. Obtained results demonstrate the significance of CNT distribution, geometric nonlinearity, applied force, fiberglass volume, open angle and fiber directions on forced vibration characteristics of multi-scale annular sector plates.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.561-562
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• 2012

• Journal of the Korean Geophysical Society
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• v.9 no.2
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• pp.113-120
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• 2006

A lot of small-scale reservoirs that is extravagant in whole country are controlled state or real conditionthat correct data about the practice contents is not equipped all up to now. In this study, YungNam districts that region Gyeong-Ju city reservoir is distributed much of when flow speedily choose 23 peace among 73 small scale reservoir and experimented. Acquired data every 5 seconds, and user E/S and user value TS for orthocenter to 1 second interval and executes present ondition measurement using RTK-GPS. Could was wave and state that reservoir of 15 places (about 65%) gives protective care that do 3D modelling with acquired data, and now correct contents about reservoir state past through comparative analysis with data. Also, area of full water and wave that analyze effective storage and area of full water of 23 places reservoir could know that 20.63%, effective storage decreased as 3.34%. I wish to contribute about analysis about present reservoir state through this and method the adminstration direction.

• Wind and Structures
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• v.14 no.1
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• pp.35-53
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• 2011

Spherical object in wind is a common scenario in daily life and engineering practice. The main challenge in understanding the aerodynamics in turbulent wind lies in the multi-aspect of turbulence. This paper presents a wind tunnel study, which focuses on the role of turbulence integral length scale ${\Lambda}$ on the drag of a sphere. Particular turbulent flow conditions were achieved via the proper combination of wind speed, orifice perforated plate, sphere diameter (D) and distance downstream from the plate. The drag was measured in turbulent flow with $2.2{\times}10^4{\leq}Re{\leq}8{\times}10^4$, $0.043{\leq}{\Lambda}/D{\leq}3.24$, and turbulence intensity Tu up to 6.3%. Our results confirmed the general trends of decreasing drag coefficient and critical Reynolds number with increasing turbulence intensity. More interestingly, the unique role of the relative integral length scale has been revealed. Over the range of conditions studied, an integral length of approximately 65% the sphere diameter is most effective in reducing the drag.

• The Journal of Korean Medicine
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• v.28 no.4
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• pp.61-68
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• 2007

Objectives : The present study investigated the integrative relationships between Sasang typology, Holland's vocational typology, and Myers-Briggs type. Methods : The sample was composed of 83 sophomores at the College of Oriental Medicine, Daegu Hanny University (56 men, 27 women; ages 19 to 39, mean age ${\pm}$S. D. = 24.38 ${\pm}$ 5.28) and was carried out with the QSCC II, Holland inventory, and MBTI. SPSS 12.0 was employed for statistical analyses. Results : The Sasang types of the subjects were as followed: 21 Soyangin (10 men, 11 women) (25.3%), 20 Taeumin (18 men, 2 women) (24.1%), and 42 Soeumin (28 men, 14 women) (50.6%). There were no significant differences in the mean scores of Realistic, Investigative, Artistic, Social, Enterprising, or Conventional scale between the 3 Sasang types, but in the mean scores of Realistic, Investigative, and Artistic scale between the 4 MBTI combinations (Sensing-Thinking, Sensing-Feeling, Intuition-Thinking, and Intuition-Feeling type): F (3, 73) = 3.11, p < .05 in Realistic scale, F (2, 73) = 3.70, p < .05 in Investigative scale, and F (2, 73) = 5.60, p < .01 in Artistic scale. Conclusions : The present study discovered that the first preference for vocational aptitude of undergraduate students at the College of Oriental Medicinewas Investigative and the second preference was Artistic, which fitted Holland's vocational codes as Investigative/Artistic or Investigative/Social scale. The personality traits underlying Sasang typology play an important factor in making career decisions.

• The Journal of Internal Korean Medicine
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• v.41 no.2
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• pp.213-223
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• 2020

Objectives: This study reports on the efficacy of using Korean medical treatment with suspected Meniere's Disease. Methods: We treated a patient with suspected Meniere's disease using Korean medical treatments (herbal medicines, acupuncture, herbal acupuncture therapy). To evaluate the results, we used the visual analogue scale (VAS) to measure dizziness, tinnitus, ear fullness, and headache. The degree of tinnitus was also evaluated using the Korean Tinnitus Handicap Inventory (K-THI). The generic health status was evaluated using the European Quality of Life-5 Dimensions (EQ-5D) scale. Results: Improvements in the VAS and EQ-5D scale scores were observed after the treatments. The change in the K-THI scores showed that the patient's tinnitus handicap was relieved. Conclusions: The results of this case study suggest that Korean medicine therapies may be effective in the treatment of suspected Meniere's Disease.

• The Journal of the Korea Contents Association
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• v.19 no.5
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• pp.612-623
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• 2019

This study aimed to examine the relation of the mother's tendency to base her self-worth on the child's achievement(child-based self-worth), negative parental relationship, and the mother's depression. For this purpose, 400 Korean mothers with children in middle and high schools completed the survey including Child-based Self-worth Scale, Adolescent-Parent relationship Scale, and CES-D scale. SPSS 18.0 and AMOS 18.0 were used to analysis procedure. The results were as follows: first, the mother's child-based self-worth, dysfunctional parent-child interaction, and depression were positively correlated to one another. Second, dysfunctional parent-child interaction fully mediated the relationship between the mother's child-based self-worth and depression. Lastly, this study discussed significance and limitations of this study, as well as proposals for future research.

• Anxiety and mood
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• v.17 no.2
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• pp.59-66
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• 2021

Objective : The purpose of this study is to investigate the relationship among the degree of symptoms of posttraumatic stress disorder (PTSD) and social support, stress coping strategies, and self-esteem in patients with PTSD. Methods : A total of 48 patients meeting DSM-5 criteria for PTSD and 48 normal controls were recruited for participation in this study. We evaluated subjects using the Clinician-Administered PTSD Scale (CAPS), Hamilton Anxiety Scale (HAM-A), Hamilton Depression Scale (HAM-D), Rosenberg Self-Esteem Scale (RSES), Multidimensional Scale of Perceived Social Support (MSPSS) and The Ways of Stress Coping Questionnaire (SCQ). We analyzed data using an independent t-test and Pearson's correlation analysis. Results : In PTSD patients, total CAPS scores showed a significant positive correlation with HAM-A and HAM-D scores and a significant negative correlation with MSPSS scores. RSES scores showed a significant positive correlation with MSPSS and SCQ scores. MSPSS scores showed a significant negative correlation with PTSD avoidance and numbing and HAM-D scores. SCQ scores showed a significant negative correlation with PTSD avoidance and numbing. Conclusion : These results revealed that the better the stress coping strategies and social support, the lower the degree of symptoms in patients with PTSD. In addition, it was found that the higher the social support and self-esteem, the lower the degree of depression and anxiety. Therefore, in the treatment process, it seems important to identify and correct the self-esteem, social support system, and stress coping strategies of patients with PTSD.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.49 no.12
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• pp.683-689
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• 2000

Two-dimensional(2-D) fiber-optic code-division multiple-access(FO-CDMA) system utilizes the optical orthogonal signature pattern code(OOSPC) to encode and decode 2-D data. Encoded 2-D data are spatially multiplexed and transmitted through an image fiber and receiver recovers the intended data by means of thresholding process. OOSPC's construction methods based on expansion of the optical orthogonal code, which is used in one-dimensional(1-D) FO-CDMA system, are introduced. Each OOSPC's performances are compared by using the bit error rate(BER) of interfering OOSPC's of other users. From the results we verify that a balanced incomplete block design(BIBD) construction has the best performance among other mehtods. We also propose a decomposed bit-plane method for parallel transmission and recovery of 256 gray-scale images using OOSPC's constructed by the BIBD method. The simulation result encourages the feasibility of parallel transmission and recovery of multiuser's images.