• Journal of Korea Ship Safrty Technology Authority
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• s.33
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• pp.12-31
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• 2012

수치 계산으로 고속 활주선의 저항 성능을 평가하기 위해서는 활주 상태에서의 항주자세 예측이 무엇보다도 중요하다고 할 수 있다. 항주자세의 변화가 큰 고속 활주선의 경우에는 활주 자세에 따라 선저 바닥면에서 나타나는 압력 변화에 의한 동적 부양력 변화가 크므로 단순히 정지 중 흘수를 기준으로 계산되어진 유체력으로 항주자세를 예측하기 보다는 자세 변화에 따른 동적 부양력의 변화와 이에 의한 자세 변화를 반복 계산을 통해 수렴시키는 것이 요구되어진다. 본 연구에서는 선형화된 자유수면 조건의 포텐셜 수치 계산으로 유체 동압력인 부양력을 계산해내고 이를 유체 정역학적 힘으로 간주하여 부력과 선체중량과의 힘과 트림 모멘트 평형 관계를 만족시키는 방법으로 반복적인 계산을 통해 수렴된 활주 자세를 얻어내었다.

• Journal of the Korea Institute of Military Science and Technology
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• v.15 no.2
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• pp.121-129
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• 2012

In this study, in terms of the exercise vehicles of the weapon systems having negative buoyancy, the analysis on the operation concepts was performed and the new methods of floating to surface were proposed. In case of having negative buoyancy, the additional methods for recovering the exercise vehicle have to be considered. As parts of recovering the exercise vehicle, for floating to surface the new methods of weight discharge, weight separation and sea water discharge were proposed. The conceptual design about sea water discharge method was performed. It was confirmed that those methods could be applied to the design of the exercise vehicle having negative buoyancy.

• Korean Journal of Psychosomatic Medicine
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• v.24 no.2
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• pp.200-207
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• 2016

Objectives : Alzheimer's disease(AD) is characterized by progressive decline of cognitive function and also by various behavioral psychological symptoms of dementia(BPSD) which causes distress to their caregivers. The purpose of this study was to investigate association between each AD patients' behavioral psychological symptoms and their caregivers' burden. Methods : Participants were 80 AD patients and their caregivers. We used Korean neuropsychiatric inventory (K-NPI) to assess the symptoms of patients and Korean version of Zarit Burden Interview(ZBI) to evaluate caregivers' burden. Results : The results showed ZBI score, which is the index for caregivers' burden, had a statistically significant positive correlation with the frequency of delusion, hallucination, agitation/aggression, depression, anxiety, disinhibition and irritability, the severity of hallucination, agitation/aggression, anxiety, disinhibition, aberrant motor, and sleep, and the global score(frequency${\times}$severity) for delusion, hallucination, agitation/aggression, depression, anxiety, disinhibition, aberrant motor, and sleep. There were significant correlations between each scale for cognitive function(i.e. MMSE-KC, CDR, GDS) and ZBI scale. Correlations between each scale for activity of daily living(i.e. Barthel -ADL, K-ADL) and ZBI scale were also significant. Conclusions : There were a significant correlation between BPSD and caregiver burden. Caregiver burden was also correlated with cognitive function and activity of daily living. Early detection and preventive treatment of these symptoms in BPSD might make improvement of caregivers' quality of life as well as AD patients'.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.38 no.7
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• pp.655-663
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• 2010

DUP (direct underside pressurization) is a device that can considerably increase lift, reduce take-off speed and minimize hump drag when a WIG effect vehicle takes off on the water surface. A 3-dimensional numerical investigation of a WIG effect vehicle with DUP is performed to analyze aerodynamic characteristics and the static height stability. The model vehicle, named Aircat, consists of a propeller in the middle of a fuselage, an air chamber under the fuselage, Lippisch-type wings and a large horizontal T-tail. The lift is mainly increased by the stagnation of the accelerated air coming into the air chamber through the channel in the middle of the fuselage. However, the accelerated air increases drag as well as reduces static height stability.

• Journal of Society of Occupational Therapy for the Aged and Dementia
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• v.12 no.2
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• pp.57-65
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• 2018

Objective : The purpose of this study was to compare the demographic characteristics, health and quality of life between general adults and adults living with dementia. Method : The data were collected using raw data of the 2016 community health survey and compared between 2,592 adults living with dementia patients and 225,840 general adults. health were assessed for sleep time, stress level, depression, and subjective health status, and quality of life was measured by EQ-5D. Result : In comparison of demographic characteristics, age and family number of adults living with dementia patients were significantly higher than general adults (p<.001), income and eduation levels were low (p<.001), and marital status was higher rate of living with spouse (p<.05). In comparison of health status, adults living with dementia patients were significantly longer in sleep time than the general adults (p<.001), and stress level was higher (p<.001), the percentage of experience of depression was higher (p<.001), and the subjective health status was worse (p<.001). Adults living with dementia patients were significantly lower in quality of life total score and all sub-domain than general adults (p<.001). Conclusion : Based on the results of this study, it is necessary to seek ways to improve the health and quality of life of dementia patients' families.

• 한국노년학
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• v.28 no.4
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• pp.1069-1087
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• 2008

The purpose of this study was to closely examine the effects of aromatherapy on Behavioral and Psychological Symptoms of Dementia(BPSD) to the elderly in a nursing home, and to help the application of aromatherapy is expected to be conducive to managing the quality life in the dementia and the care-giver, and to provide a base of the aromatherapy application as an elderly program in geriatric institutions. This is an one group pre-post test design and the research subjects were the dementia in a nursing home those were totally 15 available for communication or intention observation. Aromatherapy was offered for 3 weeks totally 15 times by once a day in each with aroma hand massage and inhalation, by blending essential oils, Lavender, Chamomile Roman and Grapefruit. The results are as follows. Given examining a change in the whole about whether there are effects of aromatherapy on BPSD, there was significant difference in a change depending on the experimental period with 1.47 for the pre-measurement value, 1.09 for the post 1-measurement value, 1.01 for the post 2-measurement value and 0.71 for the post 3-measurement value. And, even the difference in experimental period was indicated to have significant difference(F=11.501, p<0.001). As an itemized results, the effect of aromatherapy were indicated to have significant difference on easing the anxiety, anguish, fear, dreadful feeling, depressed feeling, and outstandingly bustling movement, and outstandingly inactive behavior, and sleep disturbance and behavior of wandering about at night. On the basis of the result in this study, the application of aromatherapy is expected to lead the quality life in the dementia, and to contribute to health of mind and body in the dementia as an program in geriatric institutions.