• 재활복지
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• v.22 no.2
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• pp.213-230
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• 2018

The study looked at the impact on the health of the spine caused by the increasing addiction to smart phones, and examine the moderating effect of adjusting spinal health according to cognitive strength. All subjects used the smartphone by measuring the diagnostic scale of the smartphone addiction, the angle of forward inclination of the cervical spine, and the amplitude variation of the cognitive Gamma-Peak of the brain waves. As a result, as the use of smart phones increases, the spine angle significantly increased (p<0.001), as cognitive strength increased, the spine angle decreased significantly (p<0.01). The cognitive strength also showed the effect of adjusting the spine angle through interaction with the degree of use of a smartphone (p<0.05). This results in a higher degree of smartphone use in lower and middle cognition strength groups, which results in a higher angle of forward tilt in the cervical spine.

• Journal of Aerospace System Engineering
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• v.13 no.4
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• pp.66-73
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• 2019

The objective of this study was to evaluate the structural safety of the basic design for the linear actuator for the flap control of aircrafts. The kinetic behavior of the linear actuator was determined using the multi-body dynamics (MBD) analysis, and the contact force was calculated to be used as input data for the structural analysis based on the finite element analysis. In the structural analysis, the thermal and static behaviors of the linear actuator satisfying the designed velocity were examined, and the structural safety of the linear actuator evaluated. Moreover, the dynamic behaviors of the key components of the linear actuator were investigated by the modal analysis. The actuation rod linearly moved with about 5 mm/s when the motor operated at 225 rpm and the maximum contact force of 32.83 N occurred between two driving gears. Meanwhile, the structural analysis revealed that the maximum thermal and static stresses were 1.57% and 78% of the yield strength of steel, respectively, and they were in a safe range of the structure. In addition, the linear actuator for the basic design is stable to the resonance by avoiding the natural frequencies of the components.

• Journal of The Korean Society of Agricultural Engineers
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• v.61 no.5
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• pp.89-99
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• 2019

In this study, we estimated the spatially-distributed soil moisture at the high resolution ($10m{\times}10m$) using the satellite-based Sentinel-1A/B SAR (Synthetic Aperture Radar) sensor images. The Sentinel-1A/B raw data were pre-processed using the SNAP (Sentinel Application Platform) tool provided from ESA (European Space Agency), and then the pre-processed data were converted to the backscatter coefficients. The regression equations were derived based on the relationships between the TDR (Time Domain Reflectometry)-based soil moisture measurements and the converted backscatter coefficients. The TDR measurements from the 51 RDA (Rural Development Administration) monitoring sites were used to derive the regression equations. Then, the soil moisture values were estimated using the derived regression equations with the input data of Sentinel-1A/B based backscatter coefficients. Overall, the soil moisture estimates showed the linear trends compared to the TDR measurements with the high Pearson's correlations (more than 0.7). The Sentinel-1A/B based soil moisture values matched well with the TDR measurements with various land surface conditions (bare soil, crop, forest, and urban), especially for bare soil (R: 0.885~0.910 and RMSE: 3.162~4.609). However, the Mandae-ri (forest) and Taean-eup (urban) sites showed the negative correlations with the TDR measurements. These uncertainties might be due to limitations of soil surface penetration depths of SAR sensors and complicated land surface conditions (artificial constructions near the TDR site) at urban regions. These results may infer that qualities of Sentinel-1A/B based soil moisture products are dependent on land surface conditions. Although uncertainties exist, the Sentinel-1A/B based high-resolution soil moisture products could be useful in various areas (hydrology, agriculture, drought, flood, wild fire, etc.).

• Korean Journal of Acupuncture
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• v.36 no.2
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• pp.115-126
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• 2019

Objectives : Osteoporosis is a condition characterized by low bone mass and increased bone fragility. It has become a major problem of senior citizens. The purpose of this study is to experiment the effect of water extract of Forsythiae Fructus (wFF) on osteoclast differentiation; and the other purpose is to examine the effect of wFF on osteoporosis in ovariectomized rat. Methods : To investigate the effect of wFF on osteoclast differentiation and activity, RAW 264.7 cells were used. The number of TRAP positive cell, TRAP activity, pit area, mRNA expression of makers (RANK, TRAP, CA II, CTK, MMP-9, NFATc1, c-Fos), protein expression of makers (NFATc1, c-Fos) were investigated. For in vivo study, 40 female Sprague-Dawley (SD) rats were induced osteoporosis by ovariectomy (OVX) and then tested for anti-osteoporosis effect by administration of wFF. Results : wFF suppressed osteoclatogenesis, TRAP activity and pit area formation. Moreover, wFF decreased the expression of master differentiation factors (NFATc1, c-Fos) and also reduced the osteoclastogenesis-related markers (TRAP, CA II, CTK, MMP-9). These suggest that wFF inhibit osteoclasts differentiation and bone resorption. In the OVX rat model, wFF inhibited decreasing of BMD and trabecular area. Conclusions : Forsythiae Fructus should be effective for osteoporosis prevention and treatment.

• Journal of The Korean Society of Agricultural Engineers
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• v.64 no.1
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• pp.39-50
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• 2022

In this study, we suggested the optimal training period for predicting the streamflow using the LSTM (Long Short-Term Memory) model based on the deep learning and CMIP5 (The fifth phase of the Couple Model Intercomparison Project) future climate scenarios. To validate the model performance of LSTM, the Jinan-gun (Seongsan-ri) site was selected in this study. We comfirmed that the LSTM-based streamflow was highly comparable to the measurements during the calibration (2000 to 2002/2014 to 2015) and validation (2003 to 2005/2016 to 2017) periods. Additionally, we compared the LSTM-based streamflow to the SWAT-based output during the calibration (2000~2015) and validation (2016~2019) periods. The results supported that the LSTM model also performed well in simulating streamflow during the long-term period, although small uncertainties exist. Then the SWAT-based daily streamflow was forecasted using the CMIP5 climate scenario forcing data in 2011~2100. We tested and determined the optimal training period for the LSTM model by comparing the LSTM-/SWAT-based streamflow with various scenarios. Note that the SWAT-based streamflow values were assumed as the observation because of no measurements in future (2011~2100). Our results showed that the LSTM-based streamflow was similar to the SWAT-based streamflow when the training data over the 30 years were used. These findings indicated that training periods more than 30 years were required to obtain LSTM-based reliable streamflow forecasts using climate change scenarios.

• Journal of Physiology & Pathology in Korean Medicine
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• v.35 no.5
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• pp.193-198
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• 2021

The purpose of this study is to observe the effect of Cordyceps Militaris(CM) complex extract treatment on patients diagnosed with rheumatoid arthritis(RA). We reviewed medical records of 9 rheumatoid arthritis patients who visited the pain & rehabilitation center, Daejeon Korean Medicine Hospital of Daejeon University and were treated with CM complex extract from October 14, 2019 to October 14, 2020. We analyzed the records of DAS 28(Disease Activity Score 28), CDAI(Clinical Disease Activity Index), SDAI(Simplified Disease Activity Index), VAS(Visual analogue Scale), and KHAQ-D(Korean Health Assesment Questionnaire-Disability Index) before and after treatment to evaluate the effects of CM complex extract on RA. As a result, the scores of DAS 28(p<0.05), CDAI(p<0.01), SDAI(p<0.01) and VAS(p<0.01) were statistically significantly decreased, after 8 weeks of taking CM complex extract in RA patients. In conclusion, CM complex extract treatment may have potential effects of reducing disease activity and pain and improving quality of life in patients diagnosed with RA.

• Journal of Korean Medicine Rehabilitation
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• v.31 no.3
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• pp.85-93
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• 2021

Objectives This study aims to compare the effect of an ultrasound on a guided group and an unguided group on Soyeom pharmacopuncture therapy on the facet joint in patients with acute low back pain caused by traffic accidents. Methods 21 patients with acute low back pain caused by traffic accidents from March 1, 2021 to May 31, 2021 were included in this study. The study was conducted as a retrospective study which analyzes the patient's medical records. 11 patients (Group A) received ultrasound guided Soyeom pharmacopuncture therapy and 10 patients (Group B) received unguided Soyeom pharmacopuncture therapy on the facet joint. Visual analogue scale (VAS) and Oswestry disability index (ODI) was used to evaluate improvements in functions and pain, and five point Likert scale to evaluate patient's satisfaction. Results Both groups showed a statistically significant decrease in the VAS and ODI on the 5th day of hospitalization. However, there was no statistically significant difference between the groups. Difference in the Likert scale between the groups was not statistically significant either. Conclusions We found that ultrasound guided Soyeom pharmacopuncture therapy on the facet joint showed similar efficacy compared with unguided Soyeom pharmacopuncture therapy at facet joint on acute low back pain patients caused by traffic accidents.

• Journal of Aerospace System Engineering
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• v.16 no.6
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• pp.106-113
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• 2022

The structural safety of the basic design model of the linear actuator for the individual blade pitch control of eVTOL personal aircraft was investigated. Stress analysis based on the finite element method was conducted, and the margin of safety was calculated to examine the structural safety under stall load conditions. Additionally, fatigue analysis was conducted to evaluate the fatigue life of the linear actuators under operating conditions. The load history with the blade pitch angle was calculated using multi-body dynamics analysis, and the static load analysis was used to obtain the stress distribution for the rated load. As a result, it was confirmed that the safety margins exceeded zero, and the fatigue lives of all linear actuator components exceeded 107 cycles, indicating a safe structural range.

• KIPS Transactions on Computer and Communication Systems
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• v.11 no.11
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• pp.411-418
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• 2022

Incorrectly loaded containers can easily knock down by strong winds. Container collapse accidents can lead to material damage and paralysis of the port system. In this paper, We propose a deep learning-based container loading state and accident risk detection technique. Using Darknet-based YOLO, the container load status identifies in real-time through corner casting on the top and bottom of the container, and the risk of accidents notifies the manager. We present criteria for classifying container alignment states and select efficient learning algorithms based on inference speed, classification accuracy, detection accuracy, and FPS in real embedded devices in the same environment. The study found that YOLOv4 had a weaker inference speed and performance of FPS than YOLOv3, but showed strong performance in classification accuracy and detection accuracy.

• Journal of Korean Physical Therapy Science
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• v.29 no.3
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• pp.63-74
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• 2022

Purpose: The purpose of this study is to examine the mediating effect of children's perceived peer attachment on children's subjective well-being and the effects of self-esteem, one of the variables of individual personality characteristics, on peer attachment and subjective well-being. Design: Data from the 2018 Panel Study on Korean Children were used. Methods: The survey method was conducted by the investigator, and the total number of cases was 1,434 people. Results: First, the higher the child's peer attachment leads to higher subjective well-being and self-esteem, and the higher the self-esteem leads to higher subjective well-being. Second, in the relationship between peer attachment and subjective well-being, self-esteem acts as a mediator variable. Third, children's peer attachment affects subjective well-being and self-esteem, and self-esteem affects subjective well-being. The results explain that the degree of children's peer attachment itself affects subjective well-being and self-esteem, and self-esteem also affects children's subjective well-being. Conclusion: Self-esteem is an important factor influencing subjective well-being and has a mediating effect on the relationship between peer attachment and subjective well-being. In other words, it can be understood that children feel subjective well-being through positive interactions with peers, not only in parent relationships. Based on these results, it is necessary to suggest practical interventions to enhance children's subjective sense of well-being and to develop various programs that can strengthen the sub-factors of peer attachment.