• Proceedings of the KSME Conference
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• 2004.11a
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• pp.766-771
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• 2004

In this paper, new exploration mobile robot is presented. This mobile robot, called Robhaz-6W, is able to overcome hazardous terrains, recognize three dimensional terrain information and generate a path toward the destination by itself. We develop the passive four bar linkage mechanism adoptable to such terrain without any active control and the real time stereo vision system for obstacle avoidance, a remote control and a path planning method. And the geometrical information is transmitted to the operator in the remote site via wireless LAN equipment. And finally, experimental results for the passive mechanism, the real time stereo vision system, the path planning are reported, which show the versatility of the proposed mobile robot system to carry out some tasks.

• Advances in robotics research
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• v.1 no.1
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• pp.21-39
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• 2014

Due to the rapid progress in the field of robotics, it is a high time to concentrate on the development of a robot that can manoeuvre in all type of landscapes, ascend and descend stairs and sloping surfaces autonomously. This paper presents details of a prototype robot which can navigate in very rough terrain, ascend and descend staircase as well as sloping surface and cross ditches. The robot is made up of six differentially steered wheels and some passive mechanism, making it suitable to cross long ditches and landscape undulation. Static stability of the developed robot have been carried out analytically and navigation capability of the robot is observed through simulation in different environment, separately. Description of embedded system of the robot has also been presented and experimental validation has been made along with some details on obstacle avoidance. Finally the limitations of the robot have been explored with their possible reasons.

• Korean Journal of Human Ecology
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• v.24 no.1
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• pp.25-38
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• 2015

This paper focused to classify the consumption stress coping types among married women consumers and to investigate the differences of socio-economic variables, social class, perceived health status, and consumption stress among coping types. Data were collected from 500 married women through online surveys in South Korea. Two factors of consumption stress(consumption stress before purchase, consumption stress after purchase), and three factors of consumption stress coping(Social support coping, problem solving focused coping, Passive avoidance coping) were identified. K-mean cluster analysis classified into 4 coping types with consumption stress coping. 15% of the sample were included to the passive coping type, and 25% were classified into the ambivalent coping type. 26.8% of the sample were identified to the active coping type, and 35.2% were maladaptive coping type. There were significant differences among the consumption stress coping types on education, family income, social class, health status, consumption stress after purchase. Consumer education programs should develop and implement especially for passive coping type and maladaptive coping type to cope effectively with consumption stress.

• Journal of Korean Academy of Nursing
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• v.50 no.5
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• pp.671-685
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• 2020

Purpose: The purpose of this study was to develop a Coping Scale for Infertility-Women (CSI-W). Methods: The initial items were based on an extensive literature review and in-depth interviews with seven infertile women. Forty-three items were derived from a pilot survey. Data were collected from 216 women who had experienced intrauterine insemination (IUI) and in-vitro fertilization (IVF) more than once. The data were analyzed to verify the reliability and validity of the scale. Results: Seven factors containing 28 items (four factors containing 17 items for active coping and three factors containing 11 items for passive coping) were extracted from the exploratory factor analysis to verify the construct validity. The four factors of active coping were confrontation, self-control, seeking social support (spouse), and seeking social support (colleagues and experts). The three factors of passive coping were distancing, escape, and avoidance. These items were verified through convergent, discriminant, and concurrent validity testing. The internal consistency reliability was acceptable (active coping: Cronbach's α = .78; passive coping: Cronbach's α = .81). Conclusion: As its validity and reliability have been verified through various methods, the CSI-W can contribute to assessing the coping strategies of infertile women.

• International Journal of Naval Architecture and Ocean Engineering
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• v.6 no.4
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• pp.826-839
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• 2014

Fire is a continuous threat to FPSO topside modules as large amounts of oil and gas are passing through the modules. As a conventional measure to mitigate structural failure under fire, passive fire protection (PFP) coatings are widely used on main structural members. However, an excessive use of PFP coatings can cause considerable cost for material purchase, installation, inspection and maintenance. Long installation time can be a risk since the work should be done nearly at the last fabrication stage. Thus, the minimal use of PFP can be beneficial to the reduction of construction cost and the avoidance of schedule delay. This paper presents a few case studies on how different applications of PFP have influence on collapse time of a FPSO module structure. A series of heat analysis and thermal elasto-plastic FE analysis are performed for different PFP coatings and the resultant collapse time and the amount of PFP coatings are compared with each other.

• Food Science and Biotechnology
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• v.17 no.3
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• pp.594-597
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• 2008

Natural products have been used to treat many neurological illnesses such as Alzheimer's disease. In the present study, the effects of the water extract of smoke-dried skipjack tuna (WSST), which is used as a traditional seasoning in Japan, as well as its fractions on acetylcholinesterase (AChE) inhibition in vitro and on memory in scopolamine-induced amnesia mice in vivo were evaluated. Bio-Rad P-2 gel permeation chromatography revealed the presence of 7 peaks and AChE significantly inhibited peak 3 and 5. When in vivo behavioral studies were conducted, a passive avoidance test revealed that treatment with 50 and 100 mg/kg WSST as well as with fraction 3 and 5 improved the loss in memory retention induced by scopolamine. These results suggest that skipjack tuna extract and its fractions improve memory deficits and that these substances are suitable for use in healthy foods designed to improve memory deficits induced by aging and Alzheimer's disease.

• The Korea Journal of Herbology
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• v.29 no.6
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• pp.103-109
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• 2014

Objectives : The purpose of this study aimed to investigate that dieckol - isolated from Ecklonia cava - supplementation can improve cognitive ability in mice. Methods : 48-male mice(6 weeks old) were divided into four groups; High-Dieckol group(n=12), Low-Dieckol group(n=12), Placebo group(n=12), Control group(n=12) and they were administered orally 5 days per week for 4 weeks at the same time. We performed Morris water maze test, Passive avoidance test, Blood serotonin analysis. And there was examined on neurogenesis in dentate gyrus of hippocampus using 5-bromo-2'-deoxyuridine (BrdU) to label proliferating cells. Results : The results are as follows; As a Morris water maze results, Trial duration was significantly decreased in high dieckol group comparing to placebo group and control group. Distance to target was significantly decreased in high dieckol group and low dieckol group comparing to placebo group and control group. Mean speed was significantly low in high dieckol group comparing to low dieckol group, placebo group and control group. As a Passive avoidance test results, latency time was significantly long in high dieckol group comparing to low dieckol group, placebo group and control group. BrdU cell count was significantly high in high dieckol group comparing to low dieckol group, placebo group and control group. Conclusions : As a conclusion, it is considered that dieckol supplementation might improve learning and cognitive ability.

• YAKHAK HOEJI
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• v.57 no.5
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• pp.323-329
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• 2013

This study was designed to determine and compare the cognitive enhancing effect of various Codonopsis lanceolata extracts by steaming, fermentation and high hydrostatic pressure process. We prepared water extract of C. lanceolata, steamed C. lanceolata, steamed and fermented C. lanceolata and C.lanceolata by high hydrostatic pressure process and fermentation. Cognitive enhancing effect of extracts was evaluated in scopolamine-induced memory impairment mice using by passive avoidance test and Morris water maze tests. MTT assay was conducted to investigate neuroprotective effect on glutamate induced cell death in HT22 cells. Steamed and fermented C. lanceolata water extract decreased escape latency in Morris water maze test and increased the latency time of the passive avoidance test compared to other extracts. Furthermore, the steamed and fermented C. lanceolata water extract showed neuroprotective effect. These results suggest that steaming and fermentation process more improve cognitive enhancing effect of C. lanceolata than other process.

• Journal of Oriental Neuropsychiatry
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• v.18 no.1
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• pp.1-14
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• 2007

Objective : The purpose of this study was to investigate the protective effects of Cheongsimondam-tang(COT) on the animal model of depression induced immobilization stress. Method 1) Male rats were used for this experiment. The subject were divided into 4 groups(1. normal 2. saline solution administered during immobilization stress treatment 3. COT of 100mg/kg administered 4. COT of 400mg/kg administered). 2) Immobilization stress was treated for 1 hours on day. During 2 days of immobilization stress treatment, they were executed forced swimming test, passive avoidance test, elevated plus maze test. Corticosterone in blood were measured Results 1) In EPM test, stress group showed significantly increased anxiety, COT groups showed significantly decreased anxiety. 2) In forced swimming test, COT groups did not show significantly decreased immobilization. 3) In passive avoidance test, stress group showed significantly decreased learning execution, COT groups showed significantly increased learning execution. 4) Stress group showed significantly increase in serum level of corticosterone, COT of 400mg/kg group showed significantly decreased serum level of corticosterone. Conclusion : These results suggest that Cheongsimondam-tang(COT) is effective in the treatment of depression.

• Journal of the Korean Society of Physical Medicine
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• v.7 no.1
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• pp.11-20
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• 2012

Purpose : This study is intended to examine the repetitive transcranial magnetic stimulation on cognitive function in the focal ischemic stroke rat model. Methods : This study selected 30 Sprague-Dawley rats of 8 weeks. The groups were divided into two groups and assigned 15 rats to each group. Control group: Non-treatment after injured by focal ischemic stroke; Experimental group: application of repetitive transcranial magnetic stimulation(0.1 Tesla, 25 Hz, 20 min/time, 2 times/day, 5 days/2 week) after injured by focal ischemic stroke. To assess the effect of rTMS, the passive avoidance test, spatial learning and memory ability test were analyzed at the pre, 1 day, $7^{th}$ day, $14^{th}$ day and immunohistochemistric response of BDNF were analyzed in the hippocampal dentate gyrus at $7^{th}$ day, $14^{th}$ day. Results : In passive avoidance test, the outcome of experimental group was different significantly than the control group at the $7^{th}$ day, $14^{th}$ day. In spatial learning and memory ability test, the outcome of experimental group was different significantly than the control group at the $7^{th}$ day, $14^{th}$ day. In immunohistochemistric response of BDNF in the hippocampal dentate gyrus, experimental groups was more increased than control group. Conclusion : These result suggest that improved cognitive function by repetitive transcranial magnetic stimulation after focal ischemic stroke is associated with dynamically altered expression of BDNF in hippocampal dentate gyrus and that is related with synaptic plasticity.